/* * zlib.c - An interface for zlib. * * Copyright (C) UENO Katsuhiro 2000-2003 * * $Id$ */ #include #include #include #include #include #ifdef HAVE_VALGRIND_MEMCHECK_H # include # ifndef VALGRIND_MAKE_MEM_DEFINED # define VALGRIND_MAKE_MEM_DEFINED(p, n) VALGRIND_MAKE_READABLE((p), (n)) # endif # ifndef VALGRIND_MAKE_MEM_UNDEFINED # define VALGRIND_MAKE_MEM_UNDEFINED(p, n) VALGRIND_MAKE_WRITABLE((p), (n)) # endif #else # define VALGRIND_MAKE_MEM_DEFINED(p, n) 0 # define VALGRIND_MAKE_MEM_UNDEFINED(p, n) 0 #endif #define RUBY_ZLIB_VERSION "0.6.0" #ifndef GZIP_SUPPORT #define GZIP_SUPPORT 1 #endif /* from zutil.h */ #ifndef DEF_MEM_LEVEL #if MAX_MEM_LEVEL >= 8 #define DEF_MEM_LEVEL 8 #else #define DEF_MEM_LEVEL MAX_MEM_LEVEL #endif #endif #if SIZEOF_LONG > SIZEOF_INT static inline uInt max_uint(long n) { if (n > UINT_MAX) n = UINT_MAX; return (uInt)n; } #define MAX_UINT(n) max_uint(n) #else #define MAX_UINT(n) (uInt)(n) #endif #define sizeof(x) ((int)sizeof(x)) static ID id_dictionaries; /*--------- Prototypes --------*/ static NORETURN(void raise_zlib_error(int, const char*)); static VALUE rb_zlib_version(VALUE); static VALUE do_checksum(int, VALUE*, uLong (*)(uLong, const Bytef*, uInt)); static VALUE rb_zlib_adler32(int, VALUE*, VALUE); static VALUE rb_zlib_crc32(int, VALUE*, VALUE); static VALUE rb_zlib_crc_table(VALUE); static voidpf zlib_mem_alloc(voidpf, uInt, uInt); static void zlib_mem_free(voidpf, voidpf); static void finalizer_warn(const char*); struct zstream; struct zstream_funcs; struct zstream_run_args; static void zstream_init(struct zstream*, const struct zstream_funcs*); static void zstream_expand_buffer(struct zstream*); static void zstream_expand_buffer_into(struct zstream*, unsigned long); static void zstream_append_buffer(struct zstream*, const Bytef*, long); static VALUE zstream_detach_buffer(struct zstream*); static VALUE zstream_shift_buffer(struct zstream*, long); static void zstream_buffer_ungets(struct zstream*, const Bytef*, unsigned long); static void zstream_buffer_ungetbyte(struct zstream*, int); static void zstream_append_input(struct zstream*, const Bytef*, long); static void zstream_discard_input(struct zstream*, long); static void zstream_reset_input(struct zstream*); static void zstream_passthrough_input(struct zstream*); static VALUE zstream_detach_input(struct zstream*); static void zstream_reset(struct zstream*); static VALUE zstream_end(struct zstream*); static void zstream_run(struct zstream*, Bytef*, long, int); static VALUE zstream_sync(struct zstream*, Bytef*, long); static void zstream_mark(void*); static void zstream_free(void*); static VALUE zstream_new(VALUE, const struct zstream_funcs*); static struct zstream *get_zstream(VALUE); static void zstream_finalize(struct zstream*); static VALUE rb_zstream_end(VALUE); static VALUE rb_zstream_reset(VALUE); static VALUE rb_zstream_finish(VALUE); static VALUE rb_zstream_flush_next_in(VALUE); static VALUE rb_zstream_flush_next_out(VALUE); static VALUE rb_zstream_avail_out(VALUE); static VALUE rb_zstream_set_avail_out(VALUE, VALUE); static VALUE rb_zstream_avail_in(VALUE); static VALUE rb_zstream_total_in(VALUE); static VALUE rb_zstream_total_out(VALUE); static VALUE rb_zstream_data_type(VALUE); static VALUE rb_zstream_adler(VALUE); static VALUE rb_zstream_finished_p(VALUE); static VALUE rb_zstream_closed_p(VALUE); static VALUE rb_deflate_s_allocate(VALUE); static VALUE rb_deflate_initialize(int, VALUE*, VALUE); static VALUE rb_deflate_init_copy(VALUE, VALUE); static VALUE deflate_run(VALUE); static VALUE rb_deflate_s_deflate(int, VALUE*, VALUE); static void do_deflate(struct zstream*, VALUE, int); static VALUE rb_deflate_deflate(int, VALUE*, VALUE); static VALUE rb_deflate_addstr(VALUE, VALUE); static VALUE rb_deflate_flush(int, VALUE*, VALUE); static VALUE rb_deflate_params(VALUE, VALUE, VALUE); static VALUE rb_deflate_set_dictionary(VALUE, VALUE); static VALUE inflate_run(VALUE); static VALUE rb_inflate_s_allocate(VALUE); static VALUE rb_inflate_initialize(int, VALUE*, VALUE); static VALUE rb_inflate_s_inflate(VALUE, VALUE); static void do_inflate(struct zstream*, VALUE); static VALUE rb_inflate_inflate(VALUE, VALUE); static VALUE rb_inflate_addstr(VALUE, VALUE); static VALUE rb_inflate_sync(VALUE, VALUE); static VALUE rb_inflate_sync_point_p(VALUE); static VALUE rb_inflate_set_dictionary(VALUE, VALUE); #if GZIP_SUPPORT struct gzfile; static void gzfile_mark(void*); static void gzfile_free(void*); static VALUE gzfile_new(VALUE, const struct zstream_funcs*, void (*) _((struct gzfile*))); static void gzfile_reset(struct gzfile*); static void gzfile_close(struct gzfile*, int); static void gzfile_write_raw(struct gzfile*); static VALUE gzfile_read_raw_partial(VALUE); static VALUE gzfile_read_raw_rescue(VALUE); static VALUE gzfile_read_raw(struct gzfile*); static int gzfile_read_raw_ensure(struct gzfile*, long); static char *gzfile_read_raw_until_zero(struct gzfile*, long); static unsigned int gzfile_get16(const unsigned char*); static unsigned long gzfile_get32(const unsigned char*); static void gzfile_set32(unsigned long n, unsigned char*); static void gzfile_make_header(struct gzfile*); static void gzfile_make_footer(struct gzfile*); static void gzfile_read_header(struct gzfile*); static void gzfile_check_footer(struct gzfile*); static void gzfile_write(struct gzfile*, Bytef*, long); static long gzfile_read_more(struct gzfile*); static void gzfile_calc_crc(struct gzfile*, VALUE); static VALUE gzfile_read(struct gzfile*, long); static VALUE gzfile_read_all(struct gzfile*); static void gzfile_ungets(struct gzfile*, const Bytef*, long); static void gzfile_ungetbyte(struct gzfile*, int); static VALUE gzfile_writer_end_run(VALUE); static void gzfile_writer_end(struct gzfile*); static VALUE gzfile_reader_end_run(VALUE); static void gzfile_reader_end(struct gzfile*); static void gzfile_reader_rewind(struct gzfile*); static VALUE gzfile_reader_get_unused(struct gzfile*); static struct gzfile *get_gzfile(VALUE); static VALUE gzfile_ensure_close(VALUE); static VALUE rb_gzfile_s_wrap(int, VALUE*, VALUE); static VALUE gzfile_s_open(int, VALUE*, VALUE, const char*); NORETURN(static void gzfile_raise(struct gzfile *, VALUE, const char *)); static VALUE gzfile_error_inspect(VALUE); static VALUE rb_gzfile_to_io(VALUE); static VALUE rb_gzfile_crc(VALUE); static VALUE rb_gzfile_mtime(VALUE); static VALUE rb_gzfile_level(VALUE); static VALUE rb_gzfile_os_code(VALUE); static VALUE rb_gzfile_orig_name(VALUE); static VALUE rb_gzfile_comment(VALUE); static VALUE rb_gzfile_lineno(VALUE); static VALUE rb_gzfile_set_lineno(VALUE, VALUE); static VALUE rb_gzfile_set_mtime(VALUE, VALUE); static VALUE rb_gzfile_set_orig_name(VALUE, VALUE); static VALUE rb_gzfile_set_comment(VALUE, VALUE); static VALUE rb_gzfile_close(VALUE); static VALUE rb_gzfile_finish(VALUE); static VALUE rb_gzfile_closed_p(VALUE); static VALUE rb_gzfile_eof_p(VALUE); static VALUE rb_gzfile_sync(VALUE); static VALUE rb_gzfile_set_sync(VALUE, VALUE); static VALUE rb_gzfile_total_in(VALUE); static VALUE rb_gzfile_total_out(VALUE); static VALUE rb_gzfile_path(VALUE); static VALUE rb_gzwriter_s_allocate(VALUE); static VALUE rb_gzwriter_s_open(int, VALUE*, VALUE); static VALUE rb_gzwriter_initialize(int, VALUE*, VALUE); static VALUE rb_gzwriter_flush(int, VALUE*, VALUE); static VALUE rb_gzwriter_write(VALUE, VALUE); static VALUE rb_gzwriter_putc(VALUE, VALUE); static VALUE rb_gzreader_s_allocate(VALUE); static VALUE rb_gzreader_s_open(int, VALUE*, VALUE); static VALUE rb_gzreader_initialize(int, VALUE*, VALUE); static VALUE rb_gzreader_rewind(VALUE); static VALUE rb_gzreader_unused(VALUE); static VALUE rb_gzreader_read(int, VALUE*, VALUE); static VALUE rb_gzreader_getc(VALUE); static VALUE rb_gzreader_readchar(VALUE); static VALUE rb_gzreader_each_byte(VALUE); static VALUE rb_gzreader_ungetc(VALUE, VALUE); static VALUE rb_gzreader_ungetbyte(VALUE, VALUE); static void gzreader_skip_linebreaks(struct gzfile*); static VALUE gzreader_gets(int, VALUE*, VALUE); static VALUE rb_gzreader_gets(int, VALUE*, VALUE); static VALUE rb_gzreader_readline(int, VALUE*, VALUE); static VALUE rb_gzreader_each(int, VALUE*, VALUE); static VALUE rb_gzreader_readlines(int, VALUE*, VALUE); #endif /* GZIP_SUPPORT */ /* * Document-module: Zlib * * This module provides access to the {zlib library}[http://zlib.net]. Zlib is * designed to be a portable, free, general-purpose, legally unencumbered -- * that is, not covered by any patents -- lossless data-compression library * for use on virtually any computer hardware and operating system. * * The zlib compression library provides in-memory compression and * decompression functions, including integrity checks of the uncompressed * data. * * The zlib compressed data format is described in RFC 1950, which is a * wrapper around a deflate stream which is described in RFC 1951. * * The library also supports reading and writing files in gzip (.gz) format * with an interface similar to that of IO. The gzip format is described in * RFC 1952 which is also a wrapper around a deflate stream. * * The zlib format was designed to be compact and fast for use in memory and on * communications channels. The gzip format was designed for single-file * compression on file systems, has a larger header than zlib to maintain * directory information, and uses a different, slower check method than zlib. * * See your system's zlib.h for further information about zlib * * == Sample usage * * Using the wrapper to compress strings with default parameters is quite * simple: * * require "zlib" * * data_to_compress = File.read("don_quixote.txt") * * puts "Input size: #{data_to_compress.size}" * #=> Input size: 2347740 * * data_compressed = Zlib::Deflate.deflate(data_to_compress) * * puts "Compressed size: #{data_compressed.size}" * #=> Compressed size: 887238 * * uncompressed_data = Zlib::Inflate.inflate(data_compressed) * * puts "Uncompressed data is: #{uncompressed_data}" * #=> Uncompressed data is: The Project Gutenberg EBook of Don Quixote... * * == Class tree * * - Zlib::Deflate * - Zlib::Inflate * - Zlib::ZStream * - Zlib::Error * - Zlib::StreamEnd * - Zlib::NeedDict * - Zlib::DataError * - Zlib::StreamError * - Zlib::MemError * - Zlib::BufError * - Zlib::VersionError * * (if you have GZIP_SUPPORT) * - Zlib::GzipReader * - Zlib::GzipWriter * - Zlib::GzipFile * - Zlib::GzipFile::Error * - Zlib::GzipFile::LengthError * - Zlib::GzipFile::CRCError * - Zlib::GzipFile::NoFooter * */ void Init_zlib(void); /*--------- Exceptions --------*/ static VALUE cZError, cStreamEnd, cNeedDict; static VALUE cStreamError, cDataError, cMemError, cBufError, cVersionError; static void raise_zlib_error(int err, const char *msg) { VALUE exc; if (!msg) { msg = zError(err); } switch(err) { case Z_STREAM_END: exc = rb_exc_new2(cStreamEnd, msg); break; case Z_NEED_DICT: exc = rb_exc_new2(cNeedDict, msg); break; case Z_STREAM_ERROR: exc = rb_exc_new2(cStreamError, msg); break; case Z_DATA_ERROR: exc = rb_exc_new2(cDataError, msg); break; case Z_BUF_ERROR: exc = rb_exc_new2(cBufError, msg); break; case Z_VERSION_ERROR: exc = rb_exc_new2(cVersionError, msg); break; case Z_MEM_ERROR: exc = rb_exc_new2(cMemError, msg); break; case Z_ERRNO: rb_sys_fail(msg); /* no return */ default: exc = rb_exc_new_str(cZError, rb_sprintf("unknown zlib error %d: %s", err, msg)); } rb_exc_raise(exc); } /*--- Warning (in finalizer) ---*/ static void finalizer_warn(const char *msg) { fprintf(stderr, "zlib(finalizer): %s\n", msg); } /*-------- module Zlib --------*/ /* * Document-method: Zlib.zlib_version * * Returns the string which represents the version of zlib library. */ static VALUE rb_zlib_version(VALUE klass) { VALUE str; str = rb_str_new2(zlibVersion()); OBJ_TAINT(str); /* for safe */ return str; } #if SIZEOF_LONG > SIZEOF_INT static uLong checksum_long(uLong (*func)(uLong, const Bytef*, uInt), uLong sum, const Bytef *ptr, long len) { if (len > UINT_MAX) { do { sum = func(sum, ptr, UINT_MAX); ptr += UINT_MAX; len -= UINT_MAX; } while (len >= UINT_MAX); } if (len > 0) sum = func(sum, ptr, (uInt)len); return sum; } #else #define checksum_long(func, sum, ptr, len) (func)((sum), (ptr), (len)) #endif static VALUE do_checksum(int argc, VALUE *argv, uLong (*func)(uLong, const Bytef*, uInt)) { VALUE str, vsum; unsigned long sum; rb_scan_args(argc, argv, "02", &str, &vsum); if (!NIL_P(vsum)) { sum = NUM2ULONG(vsum); } else if (NIL_P(str)) { sum = 0; } else { sum = func(0, Z_NULL, 0); } if (NIL_P(str)) { sum = func(sum, Z_NULL, 0); } else { StringValue(str); sum = checksum_long(func, sum, (Bytef*)RSTRING_PTR(str), RSTRING_LEN(str)); } return rb_uint2inum(sum); } /* * Document-method: Zlib.adler32 * * call-seq: Zlib.adler32(string, adler) * * Calculates Adler-32 checksum for +string+, and returns updated value of * +adler+. If +string+ is omitted, it returns the Adler-32 initial value. If * +adler+ is omitted, it assumes that the initial value is given to +adler+. * * Example usage: * * require "zlib" * * data = "foo" * puts "Adler32 checksum: #{Zlib.adler32(data).to_s(16)}" * #=> Adler32 checksum: 2820145 * */ static VALUE rb_zlib_adler32(int argc, VALUE *argv, VALUE klass) { return do_checksum(argc, argv, adler32); } #ifdef HAVE_ADLER32_COMBINE /* * Document-method: Zlib.adler32_combine * * call-seq: Zlib.adler32_combine(adler1, adler2, len2) * * Combine two Adler-32 check values in to one. +alder1+ is the first Adler-32 * value, +adler2+ is the second Adler-32 value. +len2+ is the length of the * string used to generate +adler2+. * */ static VALUE rb_zlib_adler32_combine(VALUE klass, VALUE adler1, VALUE adler2, VALUE len2) { return ULONG2NUM( adler32_combine(NUM2ULONG(adler1), NUM2ULONG(adler2), NUM2LONG(len2))); } #else #define rb_zlib_adler32_combine rb_f_notimplement #endif /* * Document-method: Zlib.crc32 * * call-seq: Zlib.crc32(string, crc) * * Calculates CRC checksum for +string+, and returns updated value of +crc+. If * +string+ is omitted, it returns the CRC initial value. If +crc+ is omitted, it * assumes that the initial value is given to +crc+. * * FIXME: expression. */ static VALUE rb_zlib_crc32(int argc, VALUE *argv, VALUE klass) { return do_checksum(argc, argv, crc32); } #ifdef HAVE_CRC32_COMBINE /* * Document-method: Zlib.crc32_combine * * call-seq: Zlib.crc32_combine(crc1, crc2, len2) * * Combine two CRC-32 check values in to one. +crc1+ is the first CRC-32 * value, +crc2+ is the second CRC-32 value. +len2+ is the length of the * string used to generate +crc2+. * */ static VALUE rb_zlib_crc32_combine(VALUE klass, VALUE crc1, VALUE crc2, VALUE len2) { return ULONG2NUM( crc32_combine(NUM2ULONG(crc1), NUM2ULONG(crc2), NUM2LONG(len2))); } #else #define rb_zlib_crc32_combine rb_f_notimplement #endif /* * Document-method: Zlib.crc_table * * Returns the table for calculating CRC checksum as an array. */ static VALUE rb_zlib_crc_table(VALUE obj) { #if !defined(HAVE_TYPE_Z_CRC_T) /* z_crc_t is defined since zlib-1.2.7. */ typedef unsigned long z_crc_t; #endif const z_crc_t *crctbl; VALUE dst; int i; crctbl = get_crc_table(); dst = rb_ary_new2(256); for (i = 0; i < 256; i++) { rb_ary_push(dst, rb_uint2inum(crctbl[i])); } return dst; } /*-------- zstream - internal APIs --------*/ struct zstream { unsigned long flags; VALUE buf; long buf_filled; VALUE input; z_stream stream; const struct zstream_funcs { int (*reset)(z_streamp); int (*end)(z_streamp); int (*run)(z_streamp, int); } *func; }; #define ZSTREAM_FLAG_READY 0x1 #define ZSTREAM_FLAG_IN_STREAM 0x2 #define ZSTREAM_FLAG_FINISHED 0x4 #define ZSTREAM_FLAG_CLOSING 0x8 #define ZSTREAM_FLAG_GZFILE 0x10 /* disallows yield from expand_buffer for gzip*/ #define ZSTREAM_FLAG_UNUSED 0x20 #define ZSTREAM_READY(z) ((z)->flags |= ZSTREAM_FLAG_READY) #define ZSTREAM_IS_READY(z) ((z)->flags & ZSTREAM_FLAG_READY) #define ZSTREAM_IS_FINISHED(z) ((z)->flags & ZSTREAM_FLAG_FINISHED) #define ZSTREAM_IS_CLOSING(z) ((z)->flags & ZSTREAM_FLAG_CLOSING) #define ZSTREAM_IS_GZFILE(z) ((z)->flags & ZSTREAM_FLAG_GZFILE) #define ZSTREAM_EXPAND_BUFFER_OK 0 /* I think that more better value should be found, but I gave up finding it. B) */ #define ZSTREAM_INITIAL_BUFSIZE 1024 /* Allow a quick return when the thread is interrupted */ #define ZSTREAM_AVAIL_OUT_STEP_MAX 16384 #define ZSTREAM_AVAIL_OUT_STEP_MIN 2048 static const struct zstream_funcs deflate_funcs = { deflateReset, deflateEnd, deflate, }; static const struct zstream_funcs inflate_funcs = { inflateReset, inflateEnd, inflate, }; struct zstream_run_args { struct zstream * z; int flush; /* stream flush value for inflate() or deflate() */ int interrupt; /* stop processing the stream and return to ruby */ int jump_state; /* for buffer expansion block break or exception */ int stream_output; /* for streaming zlib processing */ }; static voidpf zlib_mem_alloc(voidpf opaque, uInt items, uInt size) { voidpf p = xmalloc2(items, size); /* zlib FAQ: Valgrind (or some similar memory access checker) says that deflate is performing a conditional jump that depends on an uninitialized value. Isn't that a bug? http://www.zlib.net/zlib_faq.html#faq36 */ (void)VALGRIND_MAKE_MEM_DEFINED(p, items * size); return p; } static void zlib_mem_free(voidpf opaque, voidpf address) { xfree(address); } static void zstream_init(struct zstream *z, const struct zstream_funcs *func) { z->flags = 0; z->buf = Qnil; z->buf_filled = 0; z->input = Qnil; z->stream.zalloc = zlib_mem_alloc; z->stream.zfree = zlib_mem_free; z->stream.opaque = Z_NULL; z->stream.msg = Z_NULL; z->stream.next_in = Z_NULL; z->stream.avail_in = 0; z->stream.next_out = Z_NULL; z->stream.avail_out = 0; z->func = func; } #define zstream_init_deflate(z) zstream_init((z), &deflate_funcs) #define zstream_init_inflate(z) zstream_init((z), &inflate_funcs) static void zstream_expand_buffer(struct zstream *z) { if (NIL_P(z->buf)) { zstream_expand_buffer_into(z, ZSTREAM_INITIAL_BUFSIZE); return; } if (!ZSTREAM_IS_GZFILE(z) && rb_block_given_p()) { if (z->buf_filled >= ZSTREAM_AVAIL_OUT_STEP_MAX) { int state = 0; VALUE self = (VALUE)z->stream.opaque; rb_str_resize(z->buf, z->buf_filled); rb_obj_reveal(z->buf, rb_cString); OBJ_INFECT(z->buf, self); rb_protect(rb_yield, z->buf, &state); z->buf = Qnil; zstream_expand_buffer_into(z, ZSTREAM_AVAIL_OUT_STEP_MAX); if (state) rb_jump_tag(state); return; } else { zstream_expand_buffer_into(z, ZSTREAM_AVAIL_OUT_STEP_MAX - z->buf_filled); } } else { if (RSTRING_LEN(z->buf) - z->buf_filled >= ZSTREAM_AVAIL_OUT_STEP_MAX) { z->stream.avail_out = ZSTREAM_AVAIL_OUT_STEP_MAX; } else { long inc = z->buf_filled / 2; if (inc < ZSTREAM_AVAIL_OUT_STEP_MIN) { inc = ZSTREAM_AVAIL_OUT_STEP_MIN; } rb_str_resize(z->buf, z->buf_filled + inc); z->stream.avail_out = (inc < ZSTREAM_AVAIL_OUT_STEP_MAX) ? (int)inc : ZSTREAM_AVAIL_OUT_STEP_MAX; } z->stream.next_out = (Bytef*)RSTRING_PTR(z->buf) + z->buf_filled; } } static void zstream_expand_buffer_into(struct zstream *z, unsigned long size) { if (NIL_P(z->buf)) { /* I uses rb_str_new here not rb_str_buf_new because rb_str_buf_new makes a zero-length string. */ z->buf = rb_str_new(0, size); z->buf_filled = 0; z->stream.next_out = (Bytef*)RSTRING_PTR(z->buf); z->stream.avail_out = MAX_UINT(size); rb_obj_hide(z->buf); } else if (z->stream.avail_out != size) { rb_str_resize(z->buf, z->buf_filled + size); z->stream.next_out = (Bytef*)RSTRING_PTR(z->buf) + z->buf_filled; z->stream.avail_out = MAX_UINT(size); } } static void * zstream_expand_buffer_protect(void *ptr) { struct zstream *z = (struct zstream *)ptr; int state = 0; rb_protect((VALUE (*)(VALUE))zstream_expand_buffer, (VALUE)z, &state); return (void *)(VALUE)state; } static int zstream_expand_buffer_without_gvl(struct zstream *z) { char * new_str; long inc, len; if (RSTRING_LEN(z->buf) - z->buf_filled >= ZSTREAM_AVAIL_OUT_STEP_MAX) { z->stream.avail_out = ZSTREAM_AVAIL_OUT_STEP_MAX; } else { inc = z->buf_filled / 2; if (inc < ZSTREAM_AVAIL_OUT_STEP_MIN) { inc = ZSTREAM_AVAIL_OUT_STEP_MIN; } len = z->buf_filled + inc; new_str = ruby_xrealloc(RSTRING(z->buf)->as.heap.ptr, len + 1); /* from rb_str_resize */ RSTRING(z->buf)->as.heap.ptr = new_str; RSTRING(z->buf)->as.heap.ptr[len] = '\0'; /* sentinel */ RSTRING(z->buf)->as.heap.len = RSTRING(z->buf)->as.heap.aux.capa = len; z->stream.avail_out = (inc < ZSTREAM_AVAIL_OUT_STEP_MAX) ? (int)inc : ZSTREAM_AVAIL_OUT_STEP_MAX; } z->stream.next_out = (Bytef*)RSTRING_PTR(z->buf) + z->buf_filled; return ZSTREAM_EXPAND_BUFFER_OK; } static void zstream_append_buffer(struct zstream *z, const Bytef *src, long len) { if (NIL_P(z->buf)) { z->buf = rb_str_buf_new(len); rb_str_buf_cat(z->buf, (const char*)src, len); z->buf_filled = len; z->stream.next_out = (Bytef*)RSTRING_PTR(z->buf); z->stream.avail_out = 0; rb_obj_hide(z->buf); return; } if (RSTRING_LEN(z->buf) < z->buf_filled + len) { rb_str_resize(z->buf, z->buf_filled + len); z->stream.avail_out = 0; } else { if (z->stream.avail_out >= (uInt)len) { z->stream.avail_out -= (uInt)len; } else { z->stream.avail_out = 0; } } memcpy(RSTRING_PTR(z->buf) + z->buf_filled, src, len); z->buf_filled += len; z->stream.next_out = (Bytef*)RSTRING_PTR(z->buf) + z->buf_filled; } #define zstream_append_buffer2(z,v) \ zstream_append_buffer((z),(Bytef*)RSTRING_PTR(v),RSTRING_LEN(v)) static VALUE zstream_detach_buffer(struct zstream *z) { VALUE dst, self = (VALUE)z->stream.opaque; if (!ZSTREAM_IS_FINISHED(z) && !ZSTREAM_IS_GZFILE(z) && rb_block_given_p()) { /* prevent tiny yields mid-stream, save for next * zstream_expand_buffer() or stream end */ return Qnil; } if (NIL_P(z->buf)) { dst = rb_str_new(0, 0); } else { dst = z->buf; rb_str_resize(dst, z->buf_filled); rb_obj_reveal(dst, rb_cString); } OBJ_INFECT(dst, self); z->buf = Qnil; z->buf_filled = 0; z->stream.next_out = 0; z->stream.avail_out = 0; if (!ZSTREAM_IS_GZFILE(z) && rb_block_given_p()) { rb_yield(dst); dst = Qnil; } return dst; } static VALUE zstream_shift_buffer(struct zstream *z, long len) { VALUE dst; long buflen; if (z->buf_filled <= len) { return zstream_detach_buffer(z); } dst = rb_str_new(RSTRING_PTR(z->buf), len); z->buf_filled -= len; memmove(RSTRING_PTR(z->buf), RSTRING_PTR(z->buf) + len, z->buf_filled); z->stream.next_out = (Bytef*)RSTRING_PTR(z->buf) + z->buf_filled; buflen = RSTRING_LEN(z->buf) - z->buf_filled; if (buflen > ZSTREAM_AVAIL_OUT_STEP_MAX) { buflen = ZSTREAM_AVAIL_OUT_STEP_MAX; } z->stream.avail_out = (uInt)buflen; return dst; } static void zstream_buffer_ungets(struct zstream *z, const Bytef *b, unsigned long len) { if (NIL_P(z->buf) || RSTRING_LEN(z->buf) - z->buf_filled == 0) { zstream_expand_buffer_into(z, len); } memmove(RSTRING_PTR(z->buf) + len, RSTRING_PTR(z->buf), z->buf_filled); memmove(RSTRING_PTR(z->buf), b, len); z->buf_filled+=len; if (z->stream.avail_out > 0) { if (len > z->stream.avail_out) len = z->stream.avail_out; z->stream.next_out+=len; z->stream.avail_out-=(uInt)len; } } static void zstream_buffer_ungetbyte(struct zstream *z, int c) { if (NIL_P(z->buf) || RSTRING_LEN(z->buf) - z->buf_filled == 0) { zstream_expand_buffer(z); } memmove(RSTRING_PTR(z->buf) + 1, RSTRING_PTR(z->buf), z->buf_filled); RSTRING_PTR(z->buf)[0] = (char)c; z->buf_filled++; if (z->stream.avail_out > 0) { z->stream.next_out++; z->stream.avail_out--; } } static void zstream_append_input(struct zstream *z, const Bytef *src, long len) { if (len <= 0) return; if (NIL_P(z->input)) { z->input = rb_str_buf_new(len); rb_str_buf_cat(z->input, (const char*)src, len); rb_obj_hide(z->input); } else { rb_str_buf_cat(z->input, (const char*)src, len); } } #define zstream_append_input2(z,v)\ RB_GC_GUARD(v),\ zstream_append_input((z), (Bytef*)RSTRING_PTR(v), RSTRING_LEN(v)) static void zstream_discard_input(struct zstream *z, long len) { if (NIL_P(z->input) || RSTRING_LEN(z->input) <= len) { z->input = Qnil; } else { memmove(RSTRING_PTR(z->input), RSTRING_PTR(z->input) + len, RSTRING_LEN(z->input) - len); rb_str_resize(z->input, RSTRING_LEN(z->input) - len); } } static void zstream_reset_input(struct zstream *z) { z->input = Qnil; } static void zstream_passthrough_input(struct zstream *z) { if (!NIL_P(z->input)) { zstream_append_buffer2(z, z->input); z->input = Qnil; } } static VALUE zstream_detach_input(struct zstream *z) { VALUE dst; if (NIL_P(z->input)) { dst = rb_str_new(0, 0); } else { dst = z->input; rb_obj_reveal(dst, rb_cString); } z->input = Qnil; rb_obj_reveal(dst, rb_cString); return dst; } static void zstream_reset(struct zstream *z) { int err; err = z->func->reset(&z->stream); if (err != Z_OK) { raise_zlib_error(err, z->stream.msg); } z->flags = ZSTREAM_FLAG_READY; z->buf = Qnil; z->buf_filled = 0; z->stream.next_out = 0; z->stream.avail_out = 0; zstream_reset_input(z); } static VALUE zstream_end(struct zstream *z) { int err; if (!ZSTREAM_IS_READY(z)) { rb_warning("attempt to close uninitialized zstream; ignored."); return Qnil; } if (z->flags & ZSTREAM_FLAG_IN_STREAM) { rb_warning("attempt to close unfinished zstream; reset forced."); zstream_reset(z); } zstream_reset_input(z); err = z->func->end(&z->stream); if (err != Z_OK) { raise_zlib_error(err, z->stream.msg); } z->flags = 0; return Qnil; } static void * zstream_run_func(void *ptr) { struct zstream_run_args *args = (struct zstream_run_args *)ptr; int err, state, flush = args->flush; struct zstream *z = args->z; uInt n; err = Z_OK; while (!args->interrupt) { n = z->stream.avail_out; err = z->func->run(&z->stream, flush); z->buf_filled += n - z->stream.avail_out; if (err == Z_STREAM_END) { z->flags &= ~ZSTREAM_FLAG_IN_STREAM; z->flags |= ZSTREAM_FLAG_FINISHED; break; } if (err != Z_OK && err != Z_BUF_ERROR) break; if (z->stream.avail_out > 0) { z->flags |= ZSTREAM_FLAG_IN_STREAM; break; } if (z->stream.avail_in == 0 && z->func == &inflate_funcs) { /* break here because inflate() return Z_BUF_ERROR when avail_in == 0. */ /* but deflate() could be called with avail_in == 0 (there's hidden buffer in zstream->state) */ z->flags |= ZSTREAM_FLAG_IN_STREAM; break; } if (args->stream_output) { state = (int)(VALUE)rb_thread_call_with_gvl(zstream_expand_buffer_protect, (void *)z); } else { state = zstream_expand_buffer_without_gvl(z); } if (state) { err = Z_OK; /* buffer expanded but stream processing was stopped */ args->jump_state = state; break; } } return (void *)(VALUE)err; } /* * There is no safe way to interrupt z->run->func(). */ static void zstream_unblock_func(void *ptr) { struct zstream_run_args *args = (struct zstream_run_args *)ptr; args->interrupt = 1; } static void zstream_run(struct zstream *z, Bytef *src, long len, int flush) { struct zstream_run_args args; int err; volatile VALUE guard = Qnil; args.z = z; args.flush = flush; args.interrupt = 0; args.jump_state = 0; args.stream_output = !ZSTREAM_IS_GZFILE(z) && rb_block_given_p(); if (NIL_P(z->input) && len == 0) { z->stream.next_in = (Bytef*)""; z->stream.avail_in = 0; } else { zstream_append_input(z, src, len); z->stream.next_in = (Bytef*)RSTRING_PTR(z->input); z->stream.avail_in = MAX_UINT(RSTRING_LEN(z->input)); /* keep reference to `z->input' so as not to be garbage collected after zstream_reset_input() and prevent `z->stream.next_in' from dangling. */ guard = z->input; } if (z->stream.avail_out == 0) { zstream_expand_buffer(z); } loop: err = (int)(VALUE)rb_thread_call_without_gvl(zstream_run_func, (void *)&args, zstream_unblock_func, (void *)&args); if (flush != Z_FINISH && err == Z_BUF_ERROR && z->stream.avail_out > 0) { z->flags |= ZSTREAM_FLAG_IN_STREAM; } zstream_reset_input(z); if (err != Z_OK && err != Z_STREAM_END) { if (z->stream.avail_in > 0) { zstream_append_input(z, z->stream.next_in, z->stream.avail_in); } if (err == Z_NEED_DICT) { VALUE self = (VALUE)z->stream.opaque; if (self) { VALUE dicts = rb_ivar_get(self, id_dictionaries); VALUE dict = rb_hash_aref(dicts, rb_uint2inum(z->stream.adler)); if (!NIL_P(dict)) { rb_inflate_set_dictionary(self, dict); goto loop; } } } raise_zlib_error(err, z->stream.msg); } if (z->stream.avail_in > 0) { zstream_append_input(z, z->stream.next_in, z->stream.avail_in); RB_GC_GUARD(guard) = Qnil; /* prevent tail call to make guard effective */ } if (args.jump_state) rb_jump_tag(args.jump_state); } static VALUE zstream_sync(struct zstream *z, Bytef *src, long len) { /* VALUE rest; */ int err; if (!NIL_P(z->input)) { z->stream.next_in = (Bytef*)RSTRING_PTR(z->input); z->stream.avail_in = MAX_UINT(RSTRING_LEN(z->input)); err = inflateSync(&z->stream); if (err == Z_OK) { zstream_discard_input(z, RSTRING_LEN(z->input) - z->stream.avail_in); zstream_append_input(z, src, len); return Qtrue; } zstream_reset_input(z); if (err != Z_DATA_ERROR) { /* rest = rb_str_new((char*)z->stream.next_in, z->stream.avail_in); */ raise_zlib_error(err, z->stream.msg); } } if (len <= 0) return Qfalse; z->stream.next_in = src; z->stream.avail_in = MAX_UINT(len); err = inflateSync(&z->stream); if (err == Z_OK) { zstream_append_input(z, z->stream.next_in, z->stream.avail_in); return Qtrue; } if (err != Z_DATA_ERROR) { /* rest = rb_str_new((char*)z->stream.next_in, z->stream.avail_in); */ raise_zlib_error(err, z->stream.msg); } return Qfalse; } static void zstream_mark(void *p) { struct zstream *z = p; rb_gc_mark(z->buf); rb_gc_mark(z->input); } static void zstream_finalize(struct zstream *z) { int err = z->func->end(&z->stream); if (err == Z_STREAM_ERROR) finalizer_warn("the stream state was inconsistent."); if (err == Z_DATA_ERROR) finalizer_warn("the stream was freed prematurely."); } static void zstream_free(void *p) { struct zstream *z = p; if (ZSTREAM_IS_READY(z)) { zstream_finalize(z); } xfree(z); } static size_t zstream_memsize(const void *p) { /* n.b. this does not track memory managed via zalloc/zfree callbacks */ return sizeof(struct zstream); } static const rb_data_type_t zstream_data_type = { "zstream", { zstream_mark, zstream_free, zstream_memsize, }, 0, 0, RUBY_TYPED_FREE_IMMEDIATELY }; static VALUE zstream_new(VALUE klass, const struct zstream_funcs *funcs) { VALUE obj; struct zstream *z; obj = TypedData_Make_Struct(klass, struct zstream, &zstream_data_type, z); zstream_init(z, funcs); z->stream.opaque = (voidpf)obj; return obj; } #define zstream_deflate_new(klass) zstream_new((klass), &deflate_funcs) #define zstream_inflate_new(klass) zstream_new((klass), &inflate_funcs) static struct zstream * get_zstream(VALUE obj) { struct zstream *z; TypedData_Get_Struct(obj, struct zstream, &zstream_data_type, z); if (!ZSTREAM_IS_READY(z)) { rb_raise(cZError, "stream is not ready"); } return z; } /* ------------------------------------------------------------------------- */ /* * Document-class: Zlib::ZStream * * Zlib::ZStream is the abstract class for the stream which handles the * compressed data. The operations are defined in the subclasses: * Zlib::Deflate for compression, and Zlib::Inflate for decompression. * * An instance of Zlib::ZStream has one stream (struct zstream in the source) * and two variable-length buffers which associated to the input (next_in) of * the stream and the output (next_out) of the stream. In this document, * "input buffer" means the buffer for input, and "output buffer" means the * buffer for output. * * Data input into an instance of Zlib::ZStream are temporally stored into * the end of input buffer, and then data in input buffer are processed from * the beginning of the buffer until no more output from the stream is * produced (i.e. until avail_out > 0 after processing). During processing, * output buffer is allocated and expanded automatically to hold all output * data. * * Some particular instance methods consume the data in output buffer and * return them as a String. * * Here is an ascii art for describing above: * * +================ an instance of Zlib::ZStream ================+ * || || * || +--------+ +-------+ +--------+ || * || +--| output |<---------|zstream|<---------| input |<--+ || * || | | buffer | next_out+-------+next_in | buffer | | || * || | +--------+ +--------+ | || * || | | || * +===|======================================================|===+ * | | * v | * "output data" "input data" * * If an error occurs during processing input buffer, an exception which is a * subclass of Zlib::Error is raised. At that time, both input and output * buffer keep their conditions at the time when the error occurs. * * == Method Catalogue * * Many of the methods in this class are fairly low-level and unlikely to be * of interest to users. In fact, users are unlikely to use this class * directly; rather they will be interested in Zlib::Inflate and * Zlib::Deflate. * * The higher level methods are listed below. * * - #total_in * - #total_out * - #data_type * - #adler * - #reset * - #finish * - #finished? * - #close * - #closed? */ /* * Closes the stream. All operations on the closed stream will raise an * exception. */ static VALUE rb_zstream_end(VALUE obj) { zstream_end(get_zstream(obj)); return Qnil; } /* * Resets and initializes the stream. All data in both input and output buffer * are discarded. */ static VALUE rb_zstream_reset(VALUE obj) { zstream_reset(get_zstream(obj)); return Qnil; } /* * call-seq: * finish -> String * finish { |chunk| ... } -> nil * * Finishes the stream and flushes output buffer. If a block is given each * chunk is yielded to the block until the input buffer has been flushed to * the output buffer. */ static VALUE rb_zstream_finish(VALUE obj) { struct zstream *z = get_zstream(obj); zstream_run(z, (Bytef*)"", 0, Z_FINISH); return zstream_detach_buffer(z); } /* * call-seq: * flush_next_in -> input * */ static VALUE rb_zstream_flush_next_in(VALUE obj) { struct zstream *z; VALUE dst; TypedData_Get_Struct(obj, struct zstream, &zstream_data_type, z); dst = zstream_detach_input(z); OBJ_INFECT(dst, obj); return dst; } /* * call-seq: * flush_next_out -> String * flush_next_out { |chunk| ... } -> nil * * Flushes output buffer and returns all data in that buffer. If a block is * given each chunk is yielded to the block until the current output buffer * has been flushed. */ static VALUE rb_zstream_flush_next_out(VALUE obj) { struct zstream *z; TypedData_Get_Struct(obj, struct zstream, &zstream_data_type, z); return zstream_detach_buffer(z); } /* * Returns number of bytes of free spaces in output buffer. Because the free * space is allocated automatically, this method returns 0 normally. */ static VALUE rb_zstream_avail_out(VALUE obj) { struct zstream *z; TypedData_Get_Struct(obj, struct zstream, &zstream_data_type, z); return rb_uint2inum(z->stream.avail_out); } /* * Allocates +size+ bytes of free space in the output buffer. If there are more * than +size+ bytes already in the buffer, the buffer is truncated. Because * free space is allocated automatically, you usually don't need to use this * method. */ static VALUE rb_zstream_set_avail_out(VALUE obj, VALUE size) { struct zstream *z = get_zstream(obj); Check_Type(size, T_FIXNUM); zstream_expand_buffer_into(z, FIX2INT(size)); return size; } /* * Returns bytes of data in the input buffer. Normally, returns 0. */ static VALUE rb_zstream_avail_in(VALUE obj) { struct zstream *z; TypedData_Get_Struct(obj, struct zstream, &zstream_data_type, z); return INT2FIX(NIL_P(z->input) ? 0 : (int)(RSTRING_LEN(z->input))); } /* * Returns the total bytes of the input data to the stream. FIXME */ static VALUE rb_zstream_total_in(VALUE obj) { return rb_uint2inum(get_zstream(obj)->stream.total_in); } /* * Returns the total bytes of the output data from the stream. FIXME */ static VALUE rb_zstream_total_out(VALUE obj) { return rb_uint2inum(get_zstream(obj)->stream.total_out); } /* * Guesses the type of the data which have been inputed into the stream. The * returned value is either BINARY, ASCII, or * UNKNOWN. */ static VALUE rb_zstream_data_type(VALUE obj) { return INT2FIX(get_zstream(obj)->stream.data_type); } /* * Returns the adler-32 checksum. */ static VALUE rb_zstream_adler(VALUE obj) { return rb_uint2inum(get_zstream(obj)->stream.adler); } /* * Returns true if the stream is finished. */ static VALUE rb_zstream_finished_p(VALUE obj) { return ZSTREAM_IS_FINISHED(get_zstream(obj)) ? Qtrue : Qfalse; } /* * Returns true if the stream is closed. */ static VALUE rb_zstream_closed_p(VALUE obj) { struct zstream *z; TypedData_Get_Struct(obj, struct zstream, &zstream_data_type, z); return ZSTREAM_IS_READY(z) ? Qfalse : Qtrue; } /* ------------------------------------------------------------------------- */ /* * Document-class: Zlib::Deflate * * Zlib::Deflate is the class for compressing data. See Zlib::ZStream for more * information. */ #define FIXNUMARG(val, ifnil) \ (NIL_P((val)) ? (ifnil) \ : ((void)Check_Type((val), T_FIXNUM), FIX2INT((val)))) #define ARG_LEVEL(val) FIXNUMARG((val), Z_DEFAULT_COMPRESSION) #define ARG_WBITS(val) FIXNUMARG((val), MAX_WBITS) #define ARG_MEMLEVEL(val) FIXNUMARG((val), DEF_MEM_LEVEL) #define ARG_STRATEGY(val) FIXNUMARG((val), Z_DEFAULT_STRATEGY) #define ARG_FLUSH(val) FIXNUMARG((val), Z_NO_FLUSH) static VALUE rb_deflate_s_allocate(VALUE klass) { return zstream_deflate_new(klass); } /* * Document-method: Zlib::Deflate.new * * call-seq: * Zlib::Deflate.new(level=DEFAULT_COMPRESSION, window_bits=MAX_WBITS, mem_level=DEF_MEM_LEVEL, strategy=DEFAULT_STRATEGY) * * Creates a new deflate stream for compression. If a given argument is nil, * the default value of that argument is used. * * The +level+ sets the compression level for the deflate stream between 0 (no * compression) and 9 (best compression). The following constants have been * defined to make code more readable: * * * Zlib::DEFAULT_COMPRESSION * * Zlib::NO_COMPRESSION * * Zlib::BEST_SPEED * * Zlib::BEST_COMPRESSION * * See http://www.zlib.net/manual.html#Constants for further information. * * The +window_bits+ sets the size of the history buffer and should be between * 8 and 15. Larger values of this parameter result in better compression at * the expense of memory usage. * * The +mem_level+ specifies how much memory should be allocated for the * internal compression state. 1 uses minimum memory but is slow and reduces * compression ratio while 9 uses maximum memory for optimal speed. The * default value is 8. Two constants are defined: * * * Zlib::DEF_MEM_LEVEL * * Zlib::MAX_MEM_LEVEL * * The +strategy+ sets the deflate compression strategy. The following * strategies are available: * * Zlib::DEFAULT_STRATEGY:: For normal data * Zlib::FILTERED:: For data produced by a filter or predictor * Zlib::FIXED:: Prevents dynamic Huffman codes * Zlib::HUFFMAN_ONLY:: Prevents string matching * Zlib::RLE:: Designed for better compression of PNG image data * * See the constants for further description. * * == Examples * * === Basic * * open "compressed.file", "w+" do |io| * io << Zlib::Deflate.new.deflate(File.read("big.file")) * end * * === Custom compression * * open "compressed.file", "w+" do |compressed_io| * deflate = Zlib::Deflate.new(Zlib::BEST_COMPRESSION, * Zlib::MAX_WBITS, * Zlib::MAX_MEM_LEVEL, * Zlib::HUFFMAN_ONLY) * * begin * open "big.file" do |big_io| * until big_io.eof? do * compressed_io << zd.deflate(big_io.read(16384)) * end * end * ensure * deflate.close * end * end * * While this example will work, for best optimization review the flags for * your specific time, memory usage and output space requirements. */ static VALUE rb_deflate_initialize(int argc, VALUE *argv, VALUE obj) { struct zstream *z; VALUE level, wbits, memlevel, strategy; int err; rb_scan_args(argc, argv, "04", &level, &wbits, &memlevel, &strategy); TypedData_Get_Struct(obj, struct zstream, &zstream_data_type, z); err = deflateInit2(&z->stream, ARG_LEVEL(level), Z_DEFLATED, ARG_WBITS(wbits), ARG_MEMLEVEL(memlevel), ARG_STRATEGY(strategy)); if (err != Z_OK) { raise_zlib_error(err, z->stream.msg); } ZSTREAM_READY(z); return obj; } /* * Document-method: Zlib::Deflate#initialize_copy * * Duplicates the deflate stream. */ static VALUE rb_deflate_init_copy(VALUE self, VALUE orig) { struct zstream *z1, *z2; int err; TypedData_Get_Struct(self, struct zstream, &zstream_data_type, z1); z2 = get_zstream(orig); if (z1 == z2) return self; err = deflateCopy(&z1->stream, &z2->stream); if (err != Z_OK) { raise_zlib_error(err, 0); } z1->input = NIL_P(z2->input) ? Qnil : rb_str_dup(z2->input); z1->buf = NIL_P(z2->buf) ? Qnil : rb_str_dup(z2->buf); z1->buf_filled = z2->buf_filled; z1->flags = z2->flags; return self; } static VALUE deflate_run(VALUE args) { struct zstream *z = (struct zstream*)((VALUE*)args)[0]; VALUE src = ((VALUE*)args)[1]; zstream_run(z, (Bytef*)RSTRING_PTR(src), RSTRING_LEN(src), Z_FINISH); return zstream_detach_buffer(z); } /* * Document-method: Zlib::Deflate.deflate * * call-seq: * Zlib.deflate(string[, level]) * Zlib::Deflate.deflate(string[, level]) * * Compresses the given +string+. Valid values of level are * Zlib::NO_COMPRESSION, Zlib::BEST_SPEED, Zlib::BEST_COMPRESSION, * Zlib::DEFAULT_COMPRESSION, or an integer from 0 to 9. * * This method is almost equivalent to the following code: * * def deflate(string, level) * z = Zlib::Deflate.new(level) * dst = z.deflate(string, Zlib::FINISH) * z.close * dst * end * * See also Zlib.inflate * */ static VALUE rb_deflate_s_deflate(int argc, VALUE *argv, VALUE klass) { struct zstream z; VALUE src, level, dst, args[2]; int err, lev; rb_scan_args(argc, argv, "11", &src, &level); lev = ARG_LEVEL(level); StringValue(src); zstream_init_deflate(&z); err = deflateInit(&z.stream, lev); if (err != Z_OK) { raise_zlib_error(err, z.stream.msg); } ZSTREAM_READY(&z); args[0] = (VALUE)&z; args[1] = src; dst = rb_ensure(deflate_run, (VALUE)args, zstream_end, (VALUE)&z); OBJ_INFECT(dst, src); return dst; } static void do_deflate(struct zstream *z, VALUE src, int flush) { if (NIL_P(src)) { zstream_run(z, (Bytef*)"", 0, Z_FINISH); return; } StringValue(src); if (flush != Z_NO_FLUSH || RSTRING_LEN(src) > 0) { /* prevent BUF_ERROR */ zstream_run(z, (Bytef*)RSTRING_PTR(src), RSTRING_LEN(src), flush); } } /* * Document-method: Zlib::Deflate#deflate * * call-seq: * z.deflate(string, flush = Zlib::NO_FLUSH) -> String * z.deflate(string, flush = Zlib::NO_FLUSH) { |chunk| ... } -> nil * * Inputs +string+ into the deflate stream and returns the output from the * stream. On calling this method, both the input and the output buffers of * the stream are flushed. If +string+ is nil, this method finishes the * stream, just like Zlib::ZStream#finish. * * If a block is given consecutive deflated chunks from the +string+ are * yielded to the block and +nil+ is returned. * * The +flush+ parameter specifies the flush mode. The following constants * may be used: * * Zlib::NO_FLUSH:: The default * Zlib::SYNC_FLUSH:: Flushes the output to a byte boundary * Zlib::FULL_FLUSH:: SYNC_FLUSH + resets the compression state * Zlib::FINISH:: Pending input is processed, pending output is flushed. * * See the constants for further description. * */ static VALUE rb_deflate_deflate(int argc, VALUE *argv, VALUE obj) { struct zstream *z = get_zstream(obj); VALUE src, flush; rb_scan_args(argc, argv, "11", &src, &flush); OBJ_INFECT(obj, src); do_deflate(z, src, ARG_FLUSH(flush)); return zstream_detach_buffer(z); } /* * Document-method: Zlib::Deflate#<< * * call-seq: << string * * Inputs +string+ into the deflate stream just like Zlib::Deflate#deflate, but * returns the Zlib::Deflate object itself. The output from the stream is * preserved in output buffer. */ static VALUE rb_deflate_addstr(VALUE obj, VALUE src) { OBJ_INFECT(obj, src); do_deflate(get_zstream(obj), src, Z_NO_FLUSH); return obj; } /* * Document-method: Zlib::Deflate#flush * * call-seq: * flush(flush = Zlib::SYNC_FLUSH) -> String * flush(flush = Zlib::SYNC_FLUSH) { |chunk| ... } -> nil * * This method is equivalent to deflate('', flush). This method is * just provided to improve the readability of your Ruby program. If a block * is given chunks of deflate output are yielded to the block until the buffer * is flushed. * * See Zlib::Deflate#deflate for detail on the +flush+ constants NO_FLUSH, * SYNC_FLUSH, FULL_FLUSH and FINISH. */ static VALUE rb_deflate_flush(int argc, VALUE *argv, VALUE obj) { struct zstream *z = get_zstream(obj); VALUE v_flush; int flush; rb_scan_args(argc, argv, "01", &v_flush); flush = FIXNUMARG(v_flush, Z_SYNC_FLUSH); if (flush != Z_NO_FLUSH) { /* prevent Z_BUF_ERROR */ zstream_run(z, (Bytef*)"", 0, flush); } return zstream_detach_buffer(z); } /* * Document-method: Zlib::Deflate.params * * call-seq: params(level, strategy) * * Changes the parameters of the deflate stream to allow changes between * different types of data that require different types of compression. Any * unprocessed data is flushed before changing the params. * * See Zlib::Deflate.new for a description of +level+ and +strategy+. * */ static VALUE rb_deflate_params(VALUE obj, VALUE v_level, VALUE v_strategy) { struct zstream *z = get_zstream(obj); int level, strategy; int err; uInt n; level = ARG_LEVEL(v_level); strategy = ARG_STRATEGY(v_strategy); n = z->stream.avail_out; err = deflateParams(&z->stream, level, strategy); z->buf_filled += n - z->stream.avail_out; while (err == Z_BUF_ERROR) { rb_warning("deflateParams() returned Z_BUF_ERROR"); zstream_expand_buffer(z); n = z->stream.avail_out; err = deflateParams(&z->stream, level, strategy); z->buf_filled += n - z->stream.avail_out; } if (err != Z_OK) { raise_zlib_error(err, z->stream.msg); } return Qnil; } /* * Document-method: Zlib::Deflate.set_dictionary * * call-seq: set_dictionary(string) * * Sets the preset dictionary and returns +string+. This method is available * just only after Zlib::Deflate.new or Zlib::ZStream#reset method was called. * See zlib.h for details. * * Can raise errors of Z_STREAM_ERROR if a parameter is invalid (such as * NULL dictionary) or the stream state is inconsistent, Z_DATA_ERROR if * the given dictionary doesn't match the expected one (incorrect adler32 value) * */ static VALUE rb_deflate_set_dictionary(VALUE obj, VALUE dic) { struct zstream *z = get_zstream(obj); VALUE src = dic; int err; OBJ_INFECT(obj, dic); StringValue(src); err = deflateSetDictionary(&z->stream, (Bytef*)RSTRING_PTR(src), RSTRING_LENINT(src)); if (err != Z_OK) { raise_zlib_error(err, z->stream.msg); } return dic; } /* ------------------------------------------------------------------------- */ /* * Document-class: Zlib::Inflate * * Zlib:Inflate is the class for decompressing compressed data. Unlike * Zlib::Deflate, an instance of this class is not able to duplicate (clone, * dup) itself. */ static VALUE rb_inflate_s_allocate(VALUE klass) { VALUE inflate = zstream_inflate_new(klass); rb_ivar_set(inflate, id_dictionaries, rb_hash_new()); return inflate; } /* * Document-method: Zlib::Inflate.new * * call-seq: * Zlib::Inflate.new(window_bits = Zlib::MAX_WBITS) * * Creates a new inflate stream for decompression. +window_bits+ sets the * size of the history buffer and can have the following values: * * 0:: * Have inflate use the window size from the zlib header of the compressed * stream. * * (8..15):: * Overrides the window size of the inflate header in the compressed stream. * The window size must be greater than or equal to the window size of the * compressed stream. * * Greater than 15:: * Add 32 to window_bits to enable zlib and gzip decoding with automatic * header detection, or add 16 to decode only the gzip format (a * Zlib::DataError will be raised for a non-gzip stream). * * (-8..-15):: * Enables raw deflate mode which will not generate a check value, and will * not look for any check values for comparison at the end of the stream. * * This is for use with other formats that use the deflate compressed data * format such as zip which provide their own check values. * * == Example * * open "compressed.file" do |compressed_io| * zi = Zlib::Inflate.new(Zlib::MAX_WBITS + 32) * * begin * open "uncompressed.file", "w+" do |uncompressed_io| * uncompressed_io << zi.inflate(compressed_io.read) * end * ensure * zi.close * end * end * */ static VALUE rb_inflate_initialize(int argc, VALUE *argv, VALUE obj) { struct zstream *z; VALUE wbits; int err; rb_scan_args(argc, argv, "01", &wbits); TypedData_Get_Struct(obj, struct zstream, &zstream_data_type, z); err = inflateInit2(&z->stream, ARG_WBITS(wbits)); if (err != Z_OK) { raise_zlib_error(err, z->stream.msg); } ZSTREAM_READY(z); return obj; } static VALUE inflate_run(VALUE args) { struct zstream *z = (struct zstream*)((VALUE*)args)[0]; VALUE src = ((VALUE*)args)[1]; zstream_run(z, (Bytef*)RSTRING_PTR(src), RSTRING_LEN(src), Z_SYNC_FLUSH); zstream_run(z, (Bytef*)"", 0, Z_FINISH); /* for checking errors */ return zstream_detach_buffer(z); } /* * Document-method: Zlib::inflate * * call-seq: * Zlib.inflate(string) * Zlib::Inflate.inflate(string) * * Decompresses +string+. Raises a Zlib::NeedDict exception if a preset * dictionary is needed for decompression. * * This method is almost equivalent to the following code: * * def inflate(string) * zstream = Zlib::Inflate.new * buf = zstream.inflate(string) * zstream.finish * zstream.close * buf * end * * See also Zlib.deflate * */ static VALUE rb_inflate_s_inflate(VALUE obj, VALUE src) { struct zstream z; VALUE dst, args[2]; int err; StringValue(src); zstream_init_inflate(&z); err = inflateInit(&z.stream); if (err != Z_OK) { raise_zlib_error(err, z.stream.msg); } ZSTREAM_READY(&z); args[0] = (VALUE)&z; args[1] = src; dst = rb_ensure(inflate_run, (VALUE)args, zstream_end, (VALUE)&z); OBJ_INFECT(dst, src); return dst; } static void do_inflate(struct zstream *z, VALUE src) { if (NIL_P(src)) { zstream_run(z, (Bytef*)"", 0, Z_FINISH); return; } StringValue(src); if (RSTRING_LEN(src) > 0 || z->stream.avail_in > 0) { /* prevent Z_BUF_ERROR */ zstream_run(z, (Bytef*)RSTRING_PTR(src), RSTRING_LEN(src), Z_SYNC_FLUSH); } } /* Document-method: Zlib::Inflate#add_dictionary * * call-seq: add_dictionary(string) * * Provide the inflate stream with a dictionary that may be required in the * future. Multiple dictionaries may be provided. The inflate stream will * automatically choose the correct user-provided dictionary based on the * stream's required dictionary. */ static VALUE rb_inflate_add_dictionary(VALUE obj, VALUE dictionary) { VALUE dictionaries = rb_ivar_get(obj, id_dictionaries); VALUE checksum = do_checksum(1, &dictionary, adler32); rb_hash_aset(dictionaries, checksum, dictionary); return obj; } /* * Document-method: Zlib::Inflate#inflate * * call-seq: * inflate(deflate_string) -> String * inflate(deflate_string) { |chunk| ... } -> nil * * Inputs +deflate_string+ into the inflate stream and returns the output from * the stream. Calling this method, both the input and the output buffer of * the stream are flushed. If string is +nil+, this method finishes the * stream, just like Zlib::ZStream#finish. * * If a block is given consecutive inflated chunks from the +deflate_string+ * are yielded to the block and +nil+ is returned. * * Raises a Zlib::NeedDict exception if a preset dictionary is needed to * decompress. Set the dictionary by Zlib::Inflate#set_dictionary and then * call this method again with an empty string to flush the stream: * * inflater = Zlib::Inflate.new * * begin * out = inflater.inflate compressed * rescue Zlib::NeedDict * # ensure the dictionary matches the stream's required dictionary * raise unless inflater.adler == Zlib.adler32(dictionary) * * inflater.set_dictionary dictionary * inflater.inflate '' * end * * # ... * * inflater.close * * See also Zlib::Inflate.new */ static VALUE rb_inflate_inflate(VALUE obj, VALUE src) { struct zstream *z = get_zstream(obj); VALUE dst; OBJ_INFECT(obj, src); if (ZSTREAM_IS_FINISHED(z)) { if (NIL_P(src)) { dst = zstream_detach_buffer(z); } else { StringValue(src); zstream_append_buffer2(z, src); dst = rb_str_new(0, 0); OBJ_INFECT(dst, obj); } } else { do_inflate(z, src); dst = zstream_detach_buffer(z); if (ZSTREAM_IS_FINISHED(z)) { zstream_passthrough_input(z); } } return dst; } /* * call-seq: << string * * Inputs +string+ into the inflate stream just like Zlib::Inflate#inflate, but * returns the Zlib::Inflate object itself. The output from the stream is * preserved in output buffer. */ static VALUE rb_inflate_addstr(VALUE obj, VALUE src) { struct zstream *z = get_zstream(obj); OBJ_INFECT(obj, src); if (ZSTREAM_IS_FINISHED(z)) { if (!NIL_P(src)) { StringValue(src); zstream_append_buffer2(z, src); } } else { do_inflate(z, src); if (ZSTREAM_IS_FINISHED(z)) { zstream_passthrough_input(z); } } return obj; } /* * call-seq: sync(string) * * Inputs +string+ into the end of input buffer and skips data until a full * flush point can be found. If the point is found in the buffer, this method * flushes the buffer and returns false. Otherwise it returns +true+ and the * following data of full flush point is preserved in the buffer. */ static VALUE rb_inflate_sync(VALUE obj, VALUE src) { struct zstream *z = get_zstream(obj); OBJ_INFECT(obj, src); StringValue(src); return zstream_sync(z, (Bytef*)RSTRING_PTR(src), RSTRING_LEN(src)); } /* * Quoted verbatim from original documentation: * * What is this? * * :) */ static VALUE rb_inflate_sync_point_p(VALUE obj) { struct zstream *z = get_zstream(obj); int err; err = inflateSyncPoint(&z->stream); if (err == 1) { return Qtrue; } if (err != Z_OK) { raise_zlib_error(err, z->stream.msg); } return Qfalse; } /* * Document-method: Zlib::Inflate#set_dictionary * * Sets the preset dictionary and returns +string+. This method is available just * only after a Zlib::NeedDict exception was raised. See zlib.h for details. * */ static VALUE rb_inflate_set_dictionary(VALUE obj, VALUE dic) { struct zstream *z = get_zstream(obj); VALUE src = dic; int err; OBJ_INFECT(obj, dic); StringValue(src); err = inflateSetDictionary(&z->stream, (Bytef*)RSTRING_PTR(src), RSTRING_LENINT(src)); if (err != Z_OK) { raise_zlib_error(err, z->stream.msg); } return dic; } #if GZIP_SUPPORT /* NOTE: Features for gzip files of Ruby/zlib are written from scratch * and using undocumented feature of zlib, negative wbits. * I don't think gzFile APIs of zlib are good for Ruby. */ /*------- .gz file header --------*/ #define GZ_MAGIC1 0x1f #define GZ_MAGIC2 0x8b #define GZ_METHOD_DEFLATE 8 #define GZ_FLAG_MULTIPART 0x2 #define GZ_FLAG_EXTRA 0x4 #define GZ_FLAG_ORIG_NAME 0x8 #define GZ_FLAG_COMMENT 0x10 #define GZ_FLAG_ENCRYPT 0x20 #define GZ_FLAG_UNKNOWN_MASK 0xc0 #define GZ_EXTRAFLAG_FAST 0x4 #define GZ_EXTRAFLAG_SLOW 0x2 /* from zutil.h */ #define OS_MSDOS 0x00 #define OS_AMIGA 0x01 #define OS_VMS 0x02 #define OS_UNIX 0x03 #define OS_ATARI 0x05 #define OS_OS2 0x06 #define OS_MACOS 0x07 #define OS_TOPS20 0x0a #define OS_WIN32 0x0b #define OS_VMCMS 0x04 #define OS_ZSYSTEM 0x08 #define OS_CPM 0x09 #define OS_QDOS 0x0c #define OS_RISCOS 0x0d #define OS_UNKNOWN 0xff #ifndef OS_CODE #define OS_CODE OS_UNIX #endif static ID id_write, id_read, id_readpartial, id_flush, id_seek, id_close, id_path, id_input; static VALUE cGzError, cNoFooter, cCRCError, cLengthError; /*-------- gzfile internal APIs --------*/ struct gzfile { struct zstream z; VALUE io; int level; int os_code; /* for header */ time_t mtime; /* for header */ VALUE orig_name; /* for header; must be a String */ VALUE comment; /* for header; must be a String */ unsigned long crc; int ecflags; int lineno; long ungetc; void (*end)(struct gzfile *); rb_encoding *enc; rb_encoding *enc2; rb_econv_t *ec; VALUE ecopts; char *cbuf; VALUE path; }; #define GZFILE_CBUF_CAPA 10 #define GZFILE_FLAG_SYNC ZSTREAM_FLAG_UNUSED #define GZFILE_FLAG_HEADER_FINISHED (ZSTREAM_FLAG_UNUSED << 1) #define GZFILE_FLAG_FOOTER_FINISHED (ZSTREAM_FLAG_UNUSED << 2) #define GZFILE_IS_FINISHED(gz) \ (ZSTREAM_IS_FINISHED(&(gz)->z) && (gz)->z.buf_filled == 0) #define GZFILE_READ_SIZE 2048 static void gzfile_mark(void *p) { struct gzfile *gz = p; rb_gc_mark(gz->io); rb_gc_mark(gz->orig_name); rb_gc_mark(gz->comment); zstream_mark(&gz->z); rb_gc_mark(gz->ecopts); rb_gc_mark(gz->path); } static void gzfile_free(void *p) { struct gzfile *gz = p; struct zstream *z = &gz->z; if (ZSTREAM_IS_READY(z)) { if (z->func == &deflate_funcs) { finalizer_warn("Zlib::GzipWriter object must be closed explicitly."); } zstream_finalize(z); } if (gz->cbuf) { xfree(gz->cbuf); } xfree(gz); } static size_t gzfile_memsize(const void *p) { const struct gzfile *gz = p; size_t size = sizeof(struct gzfile); if (gz->cbuf) size += GZFILE_CBUF_CAPA; return size; } static const rb_data_type_t gzfile_data_type = { "gzfile", { gzfile_mark, gzfile_free, gzfile_memsize, }, 0, 0, RUBY_TYPED_FREE_IMMEDIATELY }; static VALUE gzfile_new(klass, funcs, endfunc) VALUE klass; const struct zstream_funcs *funcs; void (*endfunc)(struct gzfile *); { VALUE obj; struct gzfile *gz; obj = TypedData_Make_Struct(klass, struct gzfile, &gzfile_data_type, gz); zstream_init(&gz->z, funcs); gz->z.flags |= ZSTREAM_FLAG_GZFILE; gz->io = Qnil; gz->level = 0; gz->mtime = 0; gz->os_code = OS_CODE; gz->orig_name = Qnil; gz->comment = Qnil; gz->crc = crc32(0, Z_NULL, 0); gz->lineno = 0; gz->ungetc = 0; gz->end = endfunc; gz->enc = rb_default_external_encoding(); gz->enc2 = 0; gz->ec = NULL; gz->ecflags = 0; gz->ecopts = Qnil; gz->cbuf = 0; gz->path = Qnil; return obj; } #define gzfile_writer_new(gz) gzfile_new((gz),&deflate_funcs,gzfile_writer_end) #define gzfile_reader_new(gz) gzfile_new((gz),&inflate_funcs,gzfile_reader_end) static void gzfile_reset(struct gzfile *gz) { zstream_reset(&gz->z); gz->z.flags |= ZSTREAM_FLAG_GZFILE; gz->crc = crc32(0, Z_NULL, 0); gz->lineno = 0; gz->ungetc = 0; if (gz->ec) { rb_econv_close(gz->ec); gz->ec = rb_econv_open_opts(gz->enc2->name, gz->enc->name, gz->ecflags, gz->ecopts); } } static void gzfile_close(struct gzfile *gz, int closeflag) { VALUE io = gz->io; gz->end(gz); gz->io = Qnil; gz->orig_name = Qnil; gz->comment = Qnil; if (closeflag && rb_respond_to(io, id_close)) { rb_funcall(io, id_close, 0); } } static void gzfile_write_raw(struct gzfile *gz) { VALUE str; if (gz->z.buf_filled > 0) { str = zstream_detach_buffer(&gz->z); OBJ_TAINT(str); /* for safe */ rb_funcall(gz->io, id_write, 1, str); if ((gz->z.flags & GZFILE_FLAG_SYNC) && rb_respond_to(gz->io, id_flush)) rb_funcall(gz->io, id_flush, 0); } } static VALUE gzfile_read_raw_partial(VALUE arg) { struct gzfile *gz = (struct gzfile*)arg; VALUE str; str = rb_funcall(gz->io, id_readpartial, 1, INT2FIX(GZFILE_READ_SIZE)); Check_Type(str, T_STRING); return str; } static VALUE gzfile_read_raw_rescue(VALUE arg) { struct gzfile *gz = (struct gzfile*)arg; VALUE str = Qnil; if (rb_obj_is_kind_of(rb_errinfo(), rb_eNoMethodError)) { str = rb_funcall(gz->io, id_read, 1, INT2FIX(GZFILE_READ_SIZE)); if (!NIL_P(str)) { Check_Type(str, T_STRING); } } return str; /* return nil when EOFError */ } static VALUE gzfile_read_raw(struct gzfile *gz) { return rb_rescue2(gzfile_read_raw_partial, (VALUE)gz, gzfile_read_raw_rescue, (VALUE)gz, rb_eEOFError, rb_eNoMethodError, (VALUE)0); } static int gzfile_read_raw_ensure(struct gzfile *gz, long size) { VALUE str; while (NIL_P(gz->z.input) || RSTRING_LEN(gz->z.input) < size) { str = gzfile_read_raw(gz); if (NIL_P(str)) return 0; zstream_append_input2(&gz->z, str); } return 1; } static char * gzfile_read_raw_until_zero(struct gzfile *gz, long offset) { VALUE str; char *p; for (;;) { p = memchr(RSTRING_PTR(gz->z.input) + offset, '\0', RSTRING_LEN(gz->z.input) - offset); if (p) break; str = gzfile_read_raw(gz); if (NIL_P(str)) { rb_raise(cGzError, "unexpected end of file"); } offset = RSTRING_LEN(gz->z.input); zstream_append_input2(&gz->z, str); } return p; } static unsigned int gzfile_get16(const unsigned char *src) { unsigned int n; n = *(src++) & 0xff; n |= (*(src++) & 0xff) << 8; return n; } static unsigned long gzfile_get32(const unsigned char *src) { unsigned long n; n = *(src++) & 0xff; n |= (*(src++) & 0xff) << 8; n |= (*(src++) & 0xff) << 16; n |= (*(src++) & 0xffU) << 24; return n; } static void gzfile_set32(unsigned long n, unsigned char *dst) { *(dst++) = n & 0xff; *(dst++) = (n >> 8) & 0xff; *(dst++) = (n >> 16) & 0xff; *dst = (n >> 24) & 0xff; } static void gzfile_raise(struct gzfile *gz, VALUE klass, const char *message) { VALUE exc = rb_exc_new2(klass, message); if (!NIL_P(gz->z.input)) { rb_ivar_set(exc, id_input, rb_str_resurrect(gz->z.input)); } rb_exc_raise(exc); } /* * Document-method: Zlib::GzipFile::Error#inspect * * Constructs a String of the GzipFile Error */ static VALUE gzfile_error_inspect(VALUE error) { VALUE str = rb_call_super(0, 0); VALUE input = rb_attr_get(error, id_input); if (!NIL_P(input)) { rb_str_resize(str, RSTRING_LEN(str)-1); rb_str_cat2(str, ", input="); rb_str_append(str, rb_str_inspect(input)); rb_str_cat2(str, ">"); } return str; } static void gzfile_make_header(struct gzfile *gz) { Bytef buf[10]; /* the size of gzip header */ unsigned char flags = 0, extraflags = 0; if (!NIL_P(gz->orig_name)) { flags |= GZ_FLAG_ORIG_NAME; } if (!NIL_P(gz->comment)) { flags |= GZ_FLAG_COMMENT; } if (gz->mtime == 0) { gz->mtime = time(0); } if (gz->level == Z_BEST_SPEED) { extraflags |= GZ_EXTRAFLAG_FAST; } else if (gz->level == Z_BEST_COMPRESSION) { extraflags |= GZ_EXTRAFLAG_SLOW; } buf[0] = GZ_MAGIC1; buf[1] = GZ_MAGIC2; buf[2] = GZ_METHOD_DEFLATE; buf[3] = flags; gzfile_set32((unsigned long)gz->mtime, &buf[4]); buf[8] = extraflags; buf[9] = gz->os_code; zstream_append_buffer(&gz->z, buf, sizeof(buf)); if (!NIL_P(gz->orig_name)) { zstream_append_buffer2(&gz->z, gz->orig_name); zstream_append_buffer(&gz->z, (Bytef*)"\0", 1); } if (!NIL_P(gz->comment)) { zstream_append_buffer2(&gz->z, gz->comment); zstream_append_buffer(&gz->z, (Bytef*)"\0", 1); } gz->z.flags |= GZFILE_FLAG_HEADER_FINISHED; } static void gzfile_make_footer(struct gzfile *gz) { Bytef buf[8]; /* 8 is the size of gzip footer */ gzfile_set32(gz->crc, buf); gzfile_set32(gz->z.stream.total_in, &buf[4]); zstream_append_buffer(&gz->z, buf, sizeof(buf)); gz->z.flags |= GZFILE_FLAG_FOOTER_FINISHED; } static void gzfile_read_header(struct gzfile *gz) { const unsigned char *head; long len; char flags, *p; if (!gzfile_read_raw_ensure(gz, 10)) { /* 10 is the size of gzip header */ gzfile_raise(gz, cGzError, "not in gzip format"); } head = (unsigned char*)RSTRING_PTR(gz->z.input); if (head[0] != GZ_MAGIC1 || head[1] != GZ_MAGIC2) { gzfile_raise(gz, cGzError, "not in gzip format"); } if (head[2] != GZ_METHOD_DEFLATE) { rb_raise(cGzError, "unsupported compression method %d", head[2]); } flags = head[3]; if (flags & GZ_FLAG_MULTIPART) { rb_raise(cGzError, "multi-part gzip file is not supported"); } else if (flags & GZ_FLAG_ENCRYPT) { rb_raise(cGzError, "encrypted gzip file is not supported"); } else if (flags & GZ_FLAG_UNKNOWN_MASK) { rb_raise(cGzError, "unknown flags 0x%02x", flags); } if (head[8] & GZ_EXTRAFLAG_FAST) { gz->level = Z_BEST_SPEED; } else if (head[8] & GZ_EXTRAFLAG_SLOW) { gz->level = Z_BEST_COMPRESSION; } else { gz->level = Z_DEFAULT_COMPRESSION; } gz->mtime = gzfile_get32(&head[4]); gz->os_code = head[9]; zstream_discard_input(&gz->z, 10); if (flags & GZ_FLAG_EXTRA) { if (!gzfile_read_raw_ensure(gz, 2)) { rb_raise(cGzError, "unexpected end of file"); } len = gzfile_get16((Bytef*)RSTRING_PTR(gz->z.input)); if (!gzfile_read_raw_ensure(gz, 2 + len)) { rb_raise(cGzError, "unexpected end of file"); } zstream_discard_input(&gz->z, 2 + len); } if (flags & GZ_FLAG_ORIG_NAME) { if (!gzfile_read_raw_ensure(gz, 1)) { rb_raise(cGzError, "unexpected end of file"); } p = gzfile_read_raw_until_zero(gz, 0); len = p - RSTRING_PTR(gz->z.input); gz->orig_name = rb_str_new(RSTRING_PTR(gz->z.input), len); OBJ_TAINT(gz->orig_name); /* for safe */ zstream_discard_input(&gz->z, len + 1); } if (flags & GZ_FLAG_COMMENT) { if (!gzfile_read_raw_ensure(gz, 1)) { rb_raise(cGzError, "unexpected end of file"); } p = gzfile_read_raw_until_zero(gz, 0); len = p - RSTRING_PTR(gz->z.input); gz->comment = rb_str_new(RSTRING_PTR(gz->z.input), len); OBJ_TAINT(gz->comment); /* for safe */ zstream_discard_input(&gz->z, len + 1); } if (gz->z.input != Qnil && RSTRING_LEN(gz->z.input) > 0) { zstream_run(&gz->z, 0, 0, Z_SYNC_FLUSH); } } static void gzfile_check_footer(struct gzfile *gz) { unsigned long crc, length; gz->z.flags |= GZFILE_FLAG_FOOTER_FINISHED; if (!gzfile_read_raw_ensure(gz, 8)) { /* 8 is the size of gzip footer */ gzfile_raise(gz, cNoFooter, "footer is not found"); } crc = gzfile_get32((Bytef*)RSTRING_PTR(gz->z.input)); length = gzfile_get32((Bytef*)RSTRING_PTR(gz->z.input) + 4); gz->z.stream.total_in += 8; /* to rewind correctly */ zstream_discard_input(&gz->z, 8); if (gz->crc != crc) { rb_raise(cCRCError, "invalid compressed data -- crc error"); } if ((uint32_t)gz->z.stream.total_out != length) { rb_raise(cLengthError, "invalid compressed data -- length error"); } } static void gzfile_write(struct gzfile *gz, Bytef *str, long len) { if (!(gz->z.flags & GZFILE_FLAG_HEADER_FINISHED)) { gzfile_make_header(gz); } if (len > 0 || (gz->z.flags & GZFILE_FLAG_SYNC)) { gz->crc = checksum_long(crc32, gz->crc, str, len); zstream_run(&gz->z, str, len, (gz->z.flags & GZFILE_FLAG_SYNC) ? Z_SYNC_FLUSH : Z_NO_FLUSH); } gzfile_write_raw(gz); } static long gzfile_read_more(struct gzfile *gz) { volatile VALUE str; while (!ZSTREAM_IS_FINISHED(&gz->z)) { str = gzfile_read_raw(gz); if (NIL_P(str)) { if (!ZSTREAM_IS_FINISHED(&gz->z)) { rb_raise(cGzError, "unexpected end of file"); } break; } if (RSTRING_LEN(str) > 0) { /* prevent Z_BUF_ERROR */ zstream_run(&gz->z, (Bytef*)RSTRING_PTR(str), RSTRING_LEN(str), Z_SYNC_FLUSH); } if (gz->z.buf_filled > 0) break; } return gz->z.buf_filled; } static void gzfile_calc_crc(struct gzfile *gz, VALUE str) { if (RSTRING_LEN(str) <= gz->ungetc) { gz->ungetc -= RSTRING_LEN(str); } else { gz->crc = checksum_long(crc32, gz->crc, (Bytef*)RSTRING_PTR(str) + gz->ungetc, RSTRING_LEN(str) - gz->ungetc); gz->ungetc = 0; } } static VALUE gzfile_newstr(struct gzfile *gz, VALUE str) { if (!gz->enc2) { rb_enc_associate(str, gz->enc); OBJ_TAINT(str); /* for safe */ return str; } if (gz->ec && rb_enc_dummy_p(gz->enc2)) { str = rb_econv_str_convert(gz->ec, str, ECONV_PARTIAL_INPUT); rb_enc_associate(str, gz->enc); OBJ_TAINT(str); return str; } return rb_str_conv_enc_opts(str, gz->enc2, gz->enc, gz->ecflags, gz->ecopts); } static long gzfile_fill(struct gzfile *gz, long len) { if (len < 0) rb_raise(rb_eArgError, "negative length %ld given", len); if (len == 0) return 0; while (!ZSTREAM_IS_FINISHED(&gz->z) && gz->z.buf_filled < len) { gzfile_read_more(gz); } if (GZFILE_IS_FINISHED(gz)) { if (!(gz->z.flags & GZFILE_FLAG_FOOTER_FINISHED)) { gzfile_check_footer(gz); } return -1; } return len < gz->z.buf_filled ? len : gz->z.buf_filled; } static VALUE gzfile_read(struct gzfile *gz, long len) { VALUE dst; len = gzfile_fill(gz, len); if (len == 0) return rb_str_new(0, 0); if (len < 0) return Qnil; dst = zstream_shift_buffer(&gz->z, len); if (!NIL_P(dst)) gzfile_calc_crc(gz, dst); return dst; } static VALUE gzfile_readpartial(struct gzfile *gz, long len, VALUE outbuf) { VALUE dst; if (len < 0) rb_raise(rb_eArgError, "negative length %ld given", len); if (!NIL_P(outbuf)) OBJ_TAINT(outbuf); if (len == 0) { if (NIL_P(outbuf)) return rb_str_new(0, 0); else { rb_str_resize(outbuf, 0); return outbuf; } } while (!ZSTREAM_IS_FINISHED(&gz->z) && gz->z.buf_filled == 0) { gzfile_read_more(gz); } if (GZFILE_IS_FINISHED(gz)) { if (!(gz->z.flags & GZFILE_FLAG_FOOTER_FINISHED)) { gzfile_check_footer(gz); } if (!NIL_P(outbuf)) rb_str_resize(outbuf, 0); rb_raise(rb_eEOFError, "end of file reached"); } dst = zstream_shift_buffer(&gz->z, len); gzfile_calc_crc(gz, dst); if (!NIL_P(outbuf)) { rb_str_resize(outbuf, RSTRING_LEN(dst)); memcpy(RSTRING_PTR(outbuf), RSTRING_PTR(dst), RSTRING_LEN(dst)); dst = outbuf; } OBJ_TAINT(dst); /* for safe */ return dst; } static VALUE gzfile_read_all(struct gzfile *gz) { VALUE dst; while (!ZSTREAM_IS_FINISHED(&gz->z)) { gzfile_read_more(gz); } if (GZFILE_IS_FINISHED(gz)) { if (!(gz->z.flags & GZFILE_FLAG_FOOTER_FINISHED)) { gzfile_check_footer(gz); } return rb_str_new(0, 0); } dst = zstream_detach_buffer(&gz->z); if (NIL_P(dst)) return dst; gzfile_calc_crc(gz, dst); OBJ_TAINT(dst); return gzfile_newstr(gz, dst); } static VALUE gzfile_getc(struct gzfile *gz) { VALUE buf, dst = 0; int len; len = rb_enc_mbmaxlen(gz->enc); while (!ZSTREAM_IS_FINISHED(&gz->z) && gz->z.buf_filled < len) { gzfile_read_more(gz); } if (GZFILE_IS_FINISHED(gz)) { if (!(gz->z.flags & GZFILE_FLAG_FOOTER_FINISHED)) { gzfile_check_footer(gz); } return Qnil; } if (gz->ec && rb_enc_dummy_p(gz->enc2)) { const unsigned char *ss, *sp, *se; unsigned char *ds, *dp, *de; if (!gz->cbuf) { gz->cbuf = ALLOC_N(char, GZFILE_CBUF_CAPA); } ss = sp = (const unsigned char*)RSTRING_PTR(gz->z.buf); se = sp + gz->z.buf_filled; ds = dp = (unsigned char *)gz->cbuf; de = (unsigned char *)ds + GZFILE_CBUF_CAPA; (void)rb_econv_convert(gz->ec, &sp, se, &dp, de, ECONV_PARTIAL_INPUT|ECONV_AFTER_OUTPUT); rb_econv_check_error(gz->ec); dst = zstream_shift_buffer(&gz->z, sp - ss); gzfile_calc_crc(gz, dst); dst = rb_str_new(gz->cbuf, dp - ds); rb_enc_associate(dst, gz->enc); OBJ_TAINT(dst); return dst; } else { buf = gz->z.buf; len = rb_enc_mbclen(RSTRING_PTR(buf), RSTRING_END(buf), gz->enc); dst = gzfile_read(gz, len); if (NIL_P(dst)) return dst; return gzfile_newstr(gz, dst); } } static void gzfile_ungets(struct gzfile *gz, const Bytef *b, long len) { zstream_buffer_ungets(&gz->z, b, len); gz->ungetc+=len; } static void gzfile_ungetbyte(struct gzfile *gz, int c) { zstream_buffer_ungetbyte(&gz->z, c); gz->ungetc++; } static VALUE gzfile_writer_end_run(VALUE arg) { struct gzfile *gz = (struct gzfile *)arg; if (!(gz->z.flags & GZFILE_FLAG_HEADER_FINISHED)) { gzfile_make_header(gz); } zstream_run(&gz->z, (Bytef*)"", 0, Z_FINISH); gzfile_make_footer(gz); gzfile_write_raw(gz); return Qnil; } static void gzfile_writer_end(struct gzfile *gz) { if (ZSTREAM_IS_CLOSING(&gz->z)) return; gz->z.flags |= ZSTREAM_FLAG_CLOSING; rb_ensure(gzfile_writer_end_run, (VALUE)gz, zstream_end, (VALUE)&gz->z); } static VALUE gzfile_reader_end_run(VALUE arg) { struct gzfile *gz = (struct gzfile *)arg; if (GZFILE_IS_FINISHED(gz) && !(gz->z.flags & GZFILE_FLAG_FOOTER_FINISHED)) { gzfile_check_footer(gz); } return Qnil; } static void gzfile_reader_end(struct gzfile *gz) { if (ZSTREAM_IS_CLOSING(&gz->z)) return; gz->z.flags |= ZSTREAM_FLAG_CLOSING; rb_ensure(gzfile_reader_end_run, (VALUE)gz, zstream_end, (VALUE)&gz->z); } static void gzfile_reader_rewind(struct gzfile *gz) { long n; n = gz->z.stream.total_in; if (!NIL_P(gz->z.input)) { n += RSTRING_LEN(gz->z.input); } rb_funcall(gz->io, id_seek, 2, rb_int2inum(-n), INT2FIX(1)); gzfile_reset(gz); } static VALUE gzfile_reader_get_unused(struct gzfile *gz) { VALUE str; if (!ZSTREAM_IS_READY(&gz->z)) return Qnil; if (!GZFILE_IS_FINISHED(gz)) return Qnil; if (!(gz->z.flags & GZFILE_FLAG_FOOTER_FINISHED)) { gzfile_check_footer(gz); } if (NIL_P(gz->z.input)) return Qnil; str = rb_str_resurrect(gz->z.input); OBJ_TAINT(str); /* for safe */ return str; } static struct gzfile * get_gzfile(VALUE obj) { struct gzfile *gz; TypedData_Get_Struct(obj, struct gzfile, &gzfile_data_type, gz); if (!ZSTREAM_IS_READY(&gz->z)) { rb_raise(cGzError, "closed gzip stream"); } return gz; } /* ------------------------------------------------------------------------- */ /* * Document-class: Zlib::GzipFile * * Zlib::GzipFile is an abstract class for handling a gzip formatted * compressed file. The operations are defined in the subclasses, * Zlib::GzipReader for reading, and Zlib::GzipWriter for writing. * * GzipReader should be used by associating an IO, or IO-like, object. * * == Method Catalogue * * - ::wrap * - ::open (Zlib::GzipReader::open and Zlib::GzipWriter::open) * - #close * - #closed? * - #comment * - comment= (Zlib::GzipWriter#comment=) * - #crc * - eof? (Zlib::GzipReader#eof?) * - #finish * - #level * - lineno (Zlib::GzipReader#lineno) * - lineno= (Zlib::GzipReader#lineno=) * - #mtime * - mtime= (Zlib::GzipWriter#mtime=) * - #orig_name * - orig_name (Zlib::GzipWriter#orig_name=) * - #os_code * - path (when the underlying IO supports #path) * - #sync * - #sync= * - #to_io * * (due to internal structure, documentation may appear under Zlib::GzipReader * or Zlib::GzipWriter) */ typedef struct { int argc; VALUE *argv; VALUE klass; } new_wrap_arg_t; static VALUE new_wrap(VALUE tmp) { new_wrap_arg_t *arg = (new_wrap_arg_t *)tmp; return rb_class_new_instance(arg->argc, arg->argv, arg->klass); } static VALUE gzfile_ensure_close(VALUE obj) { struct gzfile *gz; TypedData_Get_Struct(obj, struct gzfile, &gzfile_data_type, gz); if (ZSTREAM_IS_READY(&gz->z)) { gzfile_close(gz, 1); } return Qnil; } static VALUE gzfile_wrap(int argc, VALUE *argv, VALUE klass, int close_io_on_error) { VALUE obj; if (close_io_on_error) { int state = 0; new_wrap_arg_t arg; arg.argc = argc; arg.argv = argv; arg.klass = klass; obj = rb_protect(new_wrap, (VALUE)&arg, &state); if (state) { rb_io_close(argv[0]); rb_jump_tag(state); } } else { obj = rb_class_new_instance(argc, argv, klass); } if (rb_block_given_p()) { return rb_ensure(rb_yield, obj, gzfile_ensure_close, obj); } else { return obj; } } /* * Document-method: Zlib::GzipFile.wrap * * call-seq: * Zlib::GzipReader.wrap(io, ...) { |gz| ... } * Zlib::GzipWriter.wrap(io, ...) { |gz| ... } * * Creates a GzipReader or GzipWriter associated with +io+, passing in any * necessary extra options, and executes the block with the newly created * object just like File.open. * * The GzipFile object will be closed automatically after executing the block. * If you want to keep the associated IO object open, you may call * Zlib::GzipFile#finish method in the block. */ static VALUE rb_gzfile_s_wrap(int argc, VALUE *argv, VALUE klass) { return gzfile_wrap(argc, argv, klass, 0); } /* * Document-method: Zlib::GzipFile.open * * See Zlib::GzipReader#open and Zlib::GzipWriter#open. */ static VALUE gzfile_s_open(int argc, VALUE *argv, VALUE klass, const char *mode) { VALUE io, filename; if (argc < 1) { rb_raise(rb_eArgError, "wrong number of arguments (0 for 1)"); } filename = argv[0]; io = rb_file_open_str(filename, mode); argv[0] = io; return gzfile_wrap(argc, argv, klass, 1); } /* * Document-method: Zlib::GzipFile#to_io * * Same as IO. */ static VALUE rb_gzfile_to_io(VALUE obj) { return get_gzfile(obj)->io; } /* * Document-method: Zlib::GzipFile#crc * * Returns CRC value of the uncompressed data. */ static VALUE rb_gzfile_crc(VALUE obj) { return rb_uint2inum(get_gzfile(obj)->crc); } /* * Document-method: Zlib::GzipFile#mtime * * Returns last modification time recorded in the gzip file header. */ static VALUE rb_gzfile_mtime(VALUE obj) { return rb_time_new(get_gzfile(obj)->mtime, (time_t)0); } /* * Document-method: Zlib::GzipFile#level * * Returns compression level. */ static VALUE rb_gzfile_level(VALUE obj) { return INT2FIX(get_gzfile(obj)->level); } /* * Document-method: Zlib::GzipFile#os_code * * Returns OS code number recorded in the gzip file header. */ static VALUE rb_gzfile_os_code(VALUE obj) { return INT2FIX(get_gzfile(obj)->os_code); } /* * Document-method: Zlib::GzipFile#orig_name * * Returns original filename recorded in the gzip file header, or +nil+ if * original filename is not present. */ static VALUE rb_gzfile_orig_name(VALUE obj) { VALUE str = get_gzfile(obj)->orig_name; if (!NIL_P(str)) { str = rb_str_dup(str); } OBJ_TAINT(str); /* for safe */ return str; } /* * Document-method: Zlib::GzipFile#comment * * Returns comments recorded in the gzip file header, or nil if the comments * is not present. */ static VALUE rb_gzfile_comment(VALUE obj) { VALUE str = get_gzfile(obj)->comment; if (!NIL_P(str)) { str = rb_str_dup(str); } OBJ_TAINT(str); /* for safe */ return str; } /* * Document-method: Zlib::GzipFile#lineno * * The line number of the last row read from this file. */ static VALUE rb_gzfile_lineno(VALUE obj) { return INT2NUM(get_gzfile(obj)->lineno); } /* * Document-method: Zlib::GzipReader#lineno= * * Specify line number of the last row read from this file. */ static VALUE rb_gzfile_set_lineno(VALUE obj, VALUE lineno) { struct gzfile *gz = get_gzfile(obj); gz->lineno = NUM2INT(lineno); return lineno; } /* * Document-method: Zlib::GzipWriter#mtime= * * Specify the modification time (+mtime+) in the gzip header. * Using a Fixnum or Integer */ static VALUE rb_gzfile_set_mtime(VALUE obj, VALUE mtime) { struct gzfile *gz = get_gzfile(obj); VALUE val; if (gz->z.flags & GZFILE_FLAG_HEADER_FINISHED) { rb_raise(cGzError, "header is already written"); } val = rb_Integer(mtime); gz->mtime = NUM2UINT(val); return mtime; } /* * Document-method: Zlib::GzipFile#orig_name= * * Specify the original name (+str+) in the gzip header. */ static VALUE rb_gzfile_set_orig_name(VALUE obj, VALUE str) { struct gzfile *gz = get_gzfile(obj); VALUE s; char *p; if (gz->z.flags & GZFILE_FLAG_HEADER_FINISHED) { rb_raise(cGzError, "header is already written"); } s = rb_str_dup(rb_str_to_str(str)); p = memchr(RSTRING_PTR(s), '\0', RSTRING_LEN(s)); if (p) { rb_str_resize(s, p - RSTRING_PTR(s)); } gz->orig_name = s; return str; } /* * Document-method: Zlib::GzipFile#comment= * * Specify the comment (+str+) in the gzip header. */ static VALUE rb_gzfile_set_comment(VALUE obj, VALUE str) { struct gzfile *gz = get_gzfile(obj); VALUE s; char *p; if (gz->z.flags & GZFILE_FLAG_HEADER_FINISHED) { rb_raise(cGzError, "header is already written"); } s = rb_str_dup(rb_str_to_str(str)); p = memchr(RSTRING_PTR(s), '\0', RSTRING_LEN(s)); if (p) { rb_str_resize(s, p - RSTRING_PTR(s)); } gz->comment = s; return str; } /* * Document-method: Zlib::GzipFile#close * * Closes the GzipFile object. This method calls close method of the * associated IO object. Returns the associated IO object. */ static VALUE rb_gzfile_close(VALUE obj) { struct gzfile *gz; VALUE io; TypedData_Get_Struct(obj, struct gzfile, &gzfile_data_type, gz); if (!ZSTREAM_IS_READY(&gz->z)) { return Qnil; } io = gz->io; gzfile_close(gz, 1); return io; } /* * Document-method: Zlib::GzipFile#finish * * Closes the GzipFile object. Unlike Zlib::GzipFile#close, this method never * calls the close method of the associated IO object. Returns the associated IO * object. */ static VALUE rb_gzfile_finish(VALUE obj) { struct gzfile *gz = get_gzfile(obj); VALUE io; io = gz->io; gzfile_close(gz, 0); return io; } /* * Document-method: Zlib::GzipFile#closed? * * Same as IO#closed? * */ static VALUE rb_gzfile_closed_p(VALUE obj) { struct gzfile *gz; TypedData_Get_Struct(obj, struct gzfile, &gzfile_data_type, gz); return NIL_P(gz->io) ? Qtrue : Qfalse; } /* * Document-method: Zlib::GzipFile#eof? * * Returns +true+ or +false+ whether the stream has reached the end. */ static VALUE rb_gzfile_eof_p(VALUE obj) { struct gzfile *gz = get_gzfile(obj); return GZFILE_IS_FINISHED(gz) ? Qtrue : Qfalse; } /* * Document-method: Zlib::GzipFile#sync * * Same as IO#sync * */ static VALUE rb_gzfile_sync(VALUE obj) { return (get_gzfile(obj)->z.flags & GZFILE_FLAG_SYNC) ? Qtrue : Qfalse; } /* * Document-method: Zlib::GzipFile#sync= * * call-seq: sync = flag * * Same as IO. If flag is +true+, the associated IO object must respond to the * +flush+ method. While +sync+ mode is +true+, the compression ratio * decreases sharply. */ static VALUE rb_gzfile_set_sync(VALUE obj, VALUE mode) { struct gzfile *gz = get_gzfile(obj); if (RTEST(mode)) { gz->z.flags |= GZFILE_FLAG_SYNC; } else { gz->z.flags &= ~GZFILE_FLAG_SYNC; } return mode; } /* * Document-method: Zlib::GzipFile#total_in * * Total number of input bytes read so far. */ static VALUE rb_gzfile_total_in(VALUE obj) { return rb_uint2inum(get_gzfile(obj)->z.stream.total_in); } /* * Document-method: Zlib::GzipFile#total_out * * Total number of output bytes output so far. */ static VALUE rb_gzfile_total_out(VALUE obj) { struct gzfile *gz = get_gzfile(obj); return rb_uint2inum(gz->z.stream.total_out - gz->z.buf_filled); } /* * Document-method: Zlib::GzipFile#path * * call-seq: path * * Returns the path string of the associated IO-like object. This * method is only defined when the IO-like object responds to #path(). */ static VALUE rb_gzfile_path(VALUE obj) { struct gzfile *gz; TypedData_Get_Struct(obj, struct gzfile, &gzfile_data_type, gz); return gz->path; } static void rb_gzfile_ecopts(struct gzfile *gz, VALUE opts) { if (!NIL_P(opts)) { rb_io_extract_encoding_option(opts, &gz->enc, &gz->enc2, NULL); } if (gz->enc2) { gz->ecflags = rb_econv_prepare_opts(opts, &opts); gz->ec = rb_econv_open_opts(gz->enc2->name, gz->enc->name, gz->ecflags, opts); gz->ecopts = opts; } } /* ------------------------------------------------------------------------- */ /* * Document-class: Zlib::GzipWriter * * Zlib::GzipWriter is a class for writing gzipped files. GzipWriter should * be used with an instance of IO, or IO-like, object. * * Following two example generate the same result. * * Zlib::GzipWriter.open('hoge.gz') do |gz| * gz.write 'jugemu jugemu gokou no surikire...' * end * * File.open('hoge.gz', 'w') do |f| * gz = Zlib::GzipWriter.new(f) * gz.write 'jugemu jugemu gokou no surikire...' * gz.close * end * * To make like gzip(1) does, run following: * * orig = 'hoge.txt' * Zlib::GzipWriter.open('hoge.gz') do |gz| * gz.mtime = File.mtime(orig) * gz.orig_name = orig * gz.write IO.binread(orig) * end * * NOTE: Due to the limitation of Ruby's finalizer, you must explicitly close * GzipWriter objects by Zlib::GzipWriter#close etc. Otherwise, GzipWriter * will be not able to write the gzip footer and will generate a broken gzip * file. */ static VALUE rb_gzwriter_s_allocate(VALUE klass) { return gzfile_writer_new(klass); } /* * call-seq: Zlib::GzipWriter.open(filename, level=nil, strategy=nil) { |gz| ... } * * Opens a file specified by +filename+ for writing gzip compressed data, and * returns a GzipWriter object associated with that file. Further details of * this method are found in Zlib::GzipWriter.new and Zlib::GzipFile.wrap. */ static VALUE rb_gzwriter_s_open(int argc, VALUE *argv, VALUE klass) { return gzfile_s_open(argc, argv, klass, "wb"); } /* * call-seq: * Zlib::GzipWriter.new(io, level = nil, strategy = nil, options = {}) * * Creates a GzipWriter object associated with +io+. +level+ and +strategy+ * should be the same as the arguments of Zlib::Deflate.new. The GzipWriter * object writes gzipped data to +io+. +io+ must respond to the * +write+ method that behaves the same as IO#write. * * The +options+ hash may be used to set the encoding of the data. * +:external_encoding+, +:internal_encoding+ and +:encoding+ may be set as in * IO::new. */ static VALUE rb_gzwriter_initialize(int argc, VALUE *argv, VALUE obj) { struct gzfile *gz; VALUE io, level, strategy, opt = Qnil; int err; if (argc > 1) { opt = rb_check_convert_type(argv[argc-1], T_HASH, "Hash", "to_hash"); if (!NIL_P(opt)) argc--; } rb_scan_args(argc, argv, "12", &io, &level, &strategy); TypedData_Get_Struct(obj, struct gzfile, &gzfile_data_type, gz); /* this is undocumented feature of zlib */ gz->level = ARG_LEVEL(level); err = deflateInit2(&gz->z.stream, gz->level, Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, ARG_STRATEGY(strategy)); if (err != Z_OK) { raise_zlib_error(err, gz->z.stream.msg); } gz->io = io; ZSTREAM_READY(&gz->z); rb_gzfile_ecopts(gz, opt); if (rb_respond_to(io, id_path)) { gz->path = rb_funcall(gz->io, id_path, 0); rb_define_singleton_method(obj, "path", rb_gzfile_path, 0); } return obj; } /* * call-seq: flush(flush=nil) * * Flushes all the internal buffers of the GzipWriter object. The meaning of * +flush+ is same as in Zlib::Deflate#deflate. Zlib::SYNC_FLUSH is used if * +flush+ is omitted. It is no use giving flush Zlib::NO_FLUSH. */ static VALUE rb_gzwriter_flush(int argc, VALUE *argv, VALUE obj) { struct gzfile *gz = get_gzfile(obj); VALUE v_flush; int flush; rb_scan_args(argc, argv, "01", &v_flush); flush = FIXNUMARG(v_flush, Z_SYNC_FLUSH); if (flush != Z_NO_FLUSH) { /* prevent Z_BUF_ERROR */ zstream_run(&gz->z, (Bytef*)"", 0, flush); } gzfile_write_raw(gz); if (rb_respond_to(gz->io, id_flush)) { rb_funcall(gz->io, id_flush, 0); } return obj; } /* * Same as IO. */ static VALUE rb_gzwriter_write(VALUE obj, VALUE str) { struct gzfile *gz = get_gzfile(obj); if (!RB_TYPE_P(str, T_STRING)) str = rb_obj_as_string(str); if (gz->enc2 && gz->enc2 != rb_ascii8bit_encoding()) { str = rb_str_conv_enc(str, rb_enc_get(str), gz->enc2); } gzfile_write(gz, (Bytef*)RSTRING_PTR(str), RSTRING_LEN(str)); return INT2FIX(RSTRING_LEN(str)); } /* * Same as IO. */ static VALUE rb_gzwriter_putc(VALUE obj, VALUE ch) { struct gzfile *gz = get_gzfile(obj); char c = NUM2CHR(ch); gzfile_write(gz, (Bytef*)&c, 1); return ch; } /* * Document-method: << * Same as IO. */ #define rb_gzwriter_addstr rb_io_addstr /* * Document-method: printf * Same as IO. */ #define rb_gzwriter_printf rb_io_printf /* * Document-method: print * Same as IO. */ #define rb_gzwriter_print rb_io_print /* * Document-method: puts * Same as IO. */ #define rb_gzwriter_puts rb_io_puts /* ------------------------------------------------------------------------- */ /* * Document-class: Zlib::GzipReader * * Zlib::GzipReader is the class for reading a gzipped file. GzipReader should * be used an IO, or -IO-like, object. * * Zlib::GzipReader.open('hoge.gz') {|gz| * print gz.read * } * * File.open('hoge.gz') do |f| * gz = Zlib::GzipReader.new(f) * print gz.read * gz.close * end * * == Method Catalogue * * The following methods in Zlib::GzipReader are just like their counterparts * in IO, but they raise Zlib::Error or Zlib::GzipFile::Error exception if an * error was found in the gzip file. * - #each * - #each_line * - #each_byte * - #gets * - #getc * - #lineno * - #lineno= * - #read * - #readchar * - #readline * - #readlines * - #ungetc * * Be careful of the footer of the gzip file. A gzip file has the checksum of * pre-compressed data in its footer. GzipReader checks all uncompressed data * against that checksum at the following cases, and if it fails, raises * Zlib::GzipFile::NoFooter, Zlib::GzipFile::CRCError, or * Zlib::GzipFile::LengthError exception. * * - When an reading request is received beyond the end of file (the end of * compressed data). That is, when Zlib::GzipReader#read, * Zlib::GzipReader#gets, or some other methods for reading returns nil. * - When Zlib::GzipFile#close method is called after the object reaches the * end of file. * - When Zlib::GzipReader#unused method is called after the object reaches * the end of file. * * The rest of the methods are adequately described in their own * documentation. */ static VALUE rb_gzreader_s_allocate(VALUE klass) { return gzfile_reader_new(klass); } /* * Document-method: Zlib::GzipReader.open * * call-seq: Zlib::GzipReader.open(filename) {|gz| ... } * * Opens a file specified by +filename+ as a gzipped file, and returns a * GzipReader object associated with that file. Further details of this method * are in Zlib::GzipReader.new and ZLib::GzipFile.wrap. */ static VALUE rb_gzreader_s_open(int argc, VALUE *argv, VALUE klass) { return gzfile_s_open(argc, argv, klass, "rb"); } /* * Document-method: Zlib::GzipReader.new * * call-seq: * Zlib::GzipReader.new(io, options = {}) * * Creates a GzipReader object associated with +io+. The GzipReader object reads * gzipped data from +io+, and parses/decompresses it. The +io+ must * have a +read+ method that behaves same as the IO#read. * * The +options+ hash may be used to set the encoding of the data. * +:external_encoding+, +:internal_encoding+ and +:encoding+ may be set as in * IO::new. * * If the gzip file header is incorrect, raises an Zlib::GzipFile::Error * exception. */ static VALUE rb_gzreader_initialize(int argc, VALUE *argv, VALUE obj) { VALUE io, opt = Qnil; struct gzfile *gz; int err; TypedData_Get_Struct(obj, struct gzfile, &gzfile_data_type, gz); rb_scan_args(argc, argv, "1:", &io, &opt); /* this is undocumented feature of zlib */ err = inflateInit2(&gz->z.stream, -MAX_WBITS); if (err != Z_OK) { raise_zlib_error(err, gz->z.stream.msg); } gz->io = io; ZSTREAM_READY(&gz->z); gzfile_read_header(gz); rb_gzfile_ecopts(gz, opt); if (rb_respond_to(io, id_path)) { gz->path = rb_funcall(gz->io, id_path, 0); rb_define_singleton_method(obj, "path", rb_gzfile_path, 0); } return obj; } /* * Document-method: Zlib::GzipReader#rewind * * Resets the position of the file pointer to the point created the GzipReader * object. The associated IO object needs to respond to the +seek+ method. */ static VALUE rb_gzreader_rewind(VALUE obj) { struct gzfile *gz = get_gzfile(obj); gzfile_reader_rewind(gz); return INT2FIX(0); } /* * Document-method: Zlib::GzipReader#unused * * Returns the rest of the data which had read for parsing gzip format, or * +nil+ if the whole gzip file is not parsed yet. */ static VALUE rb_gzreader_unused(VALUE obj) { struct gzfile *gz; TypedData_Get_Struct(obj, struct gzfile, &gzfile_data_type, gz); return gzfile_reader_get_unused(gz); } /* * Document-method: Zlib::GzipReader#read * * See Zlib::GzipReader documentation for a description. */ static VALUE rb_gzreader_read(int argc, VALUE *argv, VALUE obj) { struct gzfile *gz = get_gzfile(obj); VALUE vlen; long len; rb_scan_args(argc, argv, "01", &vlen); if (NIL_P(vlen)) { return gzfile_read_all(gz); } len = NUM2INT(vlen); if (len < 0) { rb_raise(rb_eArgError, "negative length %ld given", len); } return gzfile_read(gz, len); } /* * Document-method: Zlib::GzipReader#readpartial * * call-seq: * gzipreader.readpartial(maxlen [, outbuf]) => string, outbuf * * Reads at most maxlen bytes from the gziped stream but * it blocks only if gzipreader has no data immediately available. * If the optional outbuf argument is present, * it must reference a String, which will receive the data. * It raises EOFError on end of file. */ static VALUE rb_gzreader_readpartial(int argc, VALUE *argv, VALUE obj) { struct gzfile *gz = get_gzfile(obj); VALUE vlen, outbuf; long len; rb_scan_args(argc, argv, "11", &vlen, &outbuf); len = NUM2INT(vlen); if (len < 0) { rb_raise(rb_eArgError, "negative length %ld given", len); } if (!NIL_P(outbuf)) Check_Type(outbuf, T_STRING); return gzfile_readpartial(gz, len, outbuf); } /* * Document-method: Zlib::GzipReader#getc * * See Zlib::GzipReader documentation for a description. */ static VALUE rb_gzreader_getc(VALUE obj) { struct gzfile *gz = get_gzfile(obj); return gzfile_getc(gz); } /* * Document-method: Zlib::GzipReader#readchar * * See Zlib::GzipReader documentation for a description. */ static VALUE rb_gzreader_readchar(VALUE obj) { VALUE dst; dst = rb_gzreader_getc(obj); if (NIL_P(dst)) { rb_raise(rb_eEOFError, "end of file reached"); } return dst; } /* * Document-method: Zlib::GzipReader#getbyte * * See Zlib::GzipReader documentation for a description. */ static VALUE rb_gzreader_getbyte(VALUE obj) { struct gzfile *gz = get_gzfile(obj); VALUE dst; dst = gzfile_read(gz, 1); if (!NIL_P(dst)) { dst = INT2FIX((unsigned int)(RSTRING_PTR(dst)[0]) & 0xff); } return dst; } /* * Document-method: Zlib::GzipReader#readbyte * * See Zlib::GzipReader documentation for a description. */ static VALUE rb_gzreader_readbyte(VALUE obj) { VALUE dst; dst = rb_gzreader_getbyte(obj); if (NIL_P(dst)) { rb_raise(rb_eEOFError, "end of file reached"); } return dst; } /* * Document-method: Zlib::GzipReader#each_char * * See Zlib::GzipReader documentation for a description. */ static VALUE rb_gzreader_each_char(VALUE obj) { VALUE c; RETURN_ENUMERATOR(obj, 0, 0); while (!NIL_P(c = rb_gzreader_getc(obj))) { rb_yield(c); } return Qnil; } /* * Document-method: Zlib::GzipReader#each_byte * * See Zlib::GzipReader documentation for a description. */ static VALUE rb_gzreader_each_byte(VALUE obj) { VALUE c; RETURN_ENUMERATOR(obj, 0, 0); while (!NIL_P(c = rb_gzreader_getbyte(obj))) { rb_yield(c); } return Qnil; } /* * Document-method: Zlib::GzipReader#bytes * * This is a deprecated alias for each_byte. */ static VALUE rb_gzreader_bytes(VALUE obj) { rb_warn("Zlib::GzipReader#bytes is deprecated; use #each_byte instead"); if (!rb_block_given_p()) return rb_enumeratorize(obj, ID2SYM(rb_intern("each_byte")), 0, 0); return rb_gzreader_each_byte(obj); } /* * Document-method: Zlib::GzipReader#ungetc * * See Zlib::GzipReader documentation for a description. */ static VALUE rb_gzreader_ungetc(VALUE obj, VALUE s) { struct gzfile *gz; if (FIXNUM_P(s)) return rb_gzreader_ungetbyte(obj, s); gz = get_gzfile(obj); StringValue(s); if (gz->enc2 && gz->enc2 != rb_ascii8bit_encoding()) { s = rb_str_conv_enc(s, rb_enc_get(s), gz->enc2); } gzfile_ungets(gz, (const Bytef*)RSTRING_PTR(s), RSTRING_LEN(s)); return Qnil; } /* * Document-method: Zlib::GzipReader#ungetbyte * * See Zlib::GzipReader documentation for a description. */ static VALUE rb_gzreader_ungetbyte(VALUE obj, VALUE ch) { struct gzfile *gz = get_gzfile(obj); gzfile_ungetbyte(gz, NUM2CHR(ch)); return Qnil; } static void gzreader_skip_linebreaks(struct gzfile *gz) { VALUE str; char *p; int n; while (gz->z.buf_filled == 0) { if (GZFILE_IS_FINISHED(gz)) return; gzfile_read_more(gz); } n = 0; p = RSTRING_PTR(gz->z.buf); while (n++, *(p++) == '\n') { if (n >= gz->z.buf_filled) { str = zstream_detach_buffer(&gz->z); gzfile_calc_crc(gz, str); while (gz->z.buf_filled == 0) { if (GZFILE_IS_FINISHED(gz)) return; gzfile_read_more(gz); } n = 0; p = RSTRING_PTR(gz->z.buf); } } str = zstream_shift_buffer(&gz->z, n - 1); gzfile_calc_crc(gz, str); } static void rscheck(const char *rsptr, long rslen, VALUE rs) { if (RSTRING_PTR(rs) != rsptr && RSTRING_LEN(rs) != rslen) rb_raise(rb_eRuntimeError, "rs modified"); } static long gzreader_charboundary(struct gzfile *gz, long n) { char *s = RSTRING_PTR(gz->z.buf); char *e = s + gz->z.buf_filled; char *p = rb_enc_left_char_head(s, s + n, e, gz->enc); long l = p - s; if (l < n) { n = rb_enc_precise_mbclen(p, e, gz->enc); if (MBCLEN_NEEDMORE_P(n)) { if ((l = gzfile_fill(gz, l + MBCLEN_NEEDMORE_LEN(n))) > 0) { return l; } } else if (MBCLEN_CHARFOUND_P(n)) { return l + MBCLEN_CHARFOUND_LEN(n); } } return n; } static VALUE gzreader_gets(int argc, VALUE *argv, VALUE obj) { struct gzfile *gz = get_gzfile(obj); volatile VALUE rs; VALUE dst; const char *rsptr; char *p, *res; long rslen, n, limit = -1; int rspara; rb_encoding *enc = gz->enc; int maxlen = rb_enc_mbmaxlen(enc); if (argc == 0) { rs = rb_rs; } else { VALUE lim, tmp; rb_scan_args(argc, argv, "11", &rs, &lim); if (!NIL_P(lim)) { if (!NIL_P(rs)) StringValue(rs); } else if (!NIL_P(rs)) { tmp = rb_check_string_type(rs); if (NIL_P(tmp)) { lim = rs; rs = rb_rs; } else { rs = tmp; } } if (!NIL_P(lim)) { limit = NUM2LONG(lim); if (limit == 0) return rb_str_new(0,0); } } if (NIL_P(rs)) { if (limit < 0) { dst = gzfile_read_all(gz); if (RSTRING_LEN(dst) == 0) return Qnil; } else if ((n = gzfile_fill(gz, limit)) <= 0) { return Qnil; } else { if (maxlen > 1 && n >= limit && !GZFILE_IS_FINISHED(gz)) { n = gzreader_charboundary(gz, n); } else { n = limit; } dst = zstream_shift_buffer(&gz->z, n); if (NIL_P(dst)) return dst; gzfile_calc_crc(gz, dst); dst = gzfile_newstr(gz, dst); } gz->lineno++; return dst; } if (RSTRING_LEN(rs) == 0) { rsptr = "\n\n"; rslen = 2; rspara = 1; } else { rsptr = RSTRING_PTR(rs); rslen = RSTRING_LEN(rs); rspara = 0; } if (rspara) { gzreader_skip_linebreaks(gz); } while (gz->z.buf_filled < rslen) { if (ZSTREAM_IS_FINISHED(&gz->z)) { if (gz->z.buf_filled > 0) gz->lineno++; return gzfile_read(gz, rslen); } gzfile_read_more(gz); } p = RSTRING_PTR(gz->z.buf); n = rslen; for (;;) { long filled; if (n > gz->z.buf_filled) { if (ZSTREAM_IS_FINISHED(&gz->z)) break; gzfile_read_more(gz); p = RSTRING_PTR(gz->z.buf) + n - rslen; } if (!rspara) rscheck(rsptr, rslen, rs); filled = gz->z.buf_filled; if (limit > 0 && filled >= limit) { filled = limit; } res = memchr(p, rsptr[0], (filled - n + 1)); if (!res) { n = filled; if (limit > 0 && filled >= limit) break; n++; } else { n += (long)(res - p); p = res; if (rslen == 1 || memcmp(p, rsptr, rslen) == 0) break; p++, n++; } } if (maxlen > 1 && n == limit && (gz->z.buf_filled > n || !ZSTREAM_IS_FINISHED(&gz->z))) { n = gzreader_charboundary(gz, n); } gz->lineno++; dst = gzfile_read(gz, n); if (NIL_P(dst)) return dst; if (rspara) { gzreader_skip_linebreaks(gz); } return gzfile_newstr(gz, dst); } /* * Document-method: Zlib::GzipReader#gets * * See Zlib::GzipReader documentation for a description. */ static VALUE rb_gzreader_gets(int argc, VALUE *argv, VALUE obj) { VALUE dst; dst = gzreader_gets(argc, argv, obj); if (!NIL_P(dst)) { rb_lastline_set(dst); } return dst; } /* * Document-method: Zlib::GzipReader#readline * * See Zlib::GzipReader documentation for a description. */ static VALUE rb_gzreader_readline(int argc, VALUE *argv, VALUE obj) { VALUE dst; dst = rb_gzreader_gets(argc, argv, obj); if (NIL_P(dst)) { rb_raise(rb_eEOFError, "end of file reached"); } return dst; } /* * Document-method: Zlib::GzipReader#each * * See Zlib::GzipReader documentation for a description. */ static VALUE rb_gzreader_each(int argc, VALUE *argv, VALUE obj) { VALUE str; RETURN_ENUMERATOR(obj, 0, 0); while (!NIL_P(str = gzreader_gets(argc, argv, obj))) { rb_yield(str); } return obj; } /* * Document-method: Zlib::GzipReader#lines * * This is a deprecated alias for each_line. */ static VALUE rb_gzreader_lines(int argc, VALUE *argv, VALUE obj) { rb_warn("Zlib::GzipReader#lines is deprecated; use #each_line instead"); if (!rb_block_given_p()) return rb_enumeratorize(obj, ID2SYM(rb_intern("each_line")), argc, argv); return rb_gzreader_each(argc, argv, obj); } /* * Document-method: Zlib::GzipReader#readlines * * See Zlib::GzipReader documentation for a description. */ static VALUE rb_gzreader_readlines(int argc, VALUE *argv, VALUE obj) { VALUE str, dst; dst = rb_ary_new(); while (!NIL_P(str = gzreader_gets(argc, argv, obj))) { rb_ary_push(dst, str); } return dst; } /* * Document-method: Zlib::GzipReader#external_encoding * * See Zlib::GzipReader documentation for a description. */ static VALUE rb_gzreader_external_encoding(VALUE self) { return rb_enc_from_encoding(get_gzfile(self)->enc); } #endif /* GZIP_SUPPORT */ void Init_zlib(void) { VALUE mZlib, cZStream, cDeflate, cInflate; #if GZIP_SUPPORT VALUE cGzipFile, cGzipWriter, cGzipReader; #endif mZlib = rb_define_module("Zlib"); id_dictionaries = rb_intern("@dictionaries"); cZError = rb_define_class_under(mZlib, "Error", rb_eStandardError); cStreamEnd = rb_define_class_under(mZlib, "StreamEnd", cZError); cNeedDict = rb_define_class_under(mZlib, "NeedDict", cZError); cDataError = rb_define_class_under(mZlib, "DataError", cZError); cStreamError = rb_define_class_under(mZlib, "StreamError", cZError); cMemError = rb_define_class_under(mZlib, "MemError", cZError); cBufError = rb_define_class_under(mZlib, "BufError", cZError); cVersionError = rb_define_class_under(mZlib, "VersionError", cZError); rb_define_module_function(mZlib, "zlib_version", rb_zlib_version, 0); rb_define_module_function(mZlib, "adler32", rb_zlib_adler32, -1); rb_define_module_function(mZlib, "adler32_combine", rb_zlib_adler32_combine, 3); rb_define_module_function(mZlib, "crc32", rb_zlib_crc32, -1); rb_define_module_function(mZlib, "crc32_combine", rb_zlib_crc32_combine, 3); rb_define_module_function(mZlib, "crc_table", rb_zlib_crc_table, 0); /* The Ruby/zlib version string. */ rb_define_const(mZlib, "VERSION", rb_str_new2(RUBY_ZLIB_VERSION)); /* The string which represents the version of zlib.h */ rb_define_const(mZlib, "ZLIB_VERSION", rb_str_new2(ZLIB_VERSION)); cZStream = rb_define_class_under(mZlib, "ZStream", rb_cObject); rb_undef_alloc_func(cZStream); rb_define_method(cZStream, "avail_out", rb_zstream_avail_out, 0); rb_define_method(cZStream, "avail_out=", rb_zstream_set_avail_out, 1); rb_define_method(cZStream, "avail_in", rb_zstream_avail_in, 0); rb_define_method(cZStream, "total_in", rb_zstream_total_in, 0); rb_define_method(cZStream, "total_out", rb_zstream_total_out, 0); rb_define_method(cZStream, "data_type", rb_zstream_data_type, 0); rb_define_method(cZStream, "adler", rb_zstream_adler, 0); rb_define_method(cZStream, "finished?", rb_zstream_finished_p, 0); rb_define_method(cZStream, "stream_end?", rb_zstream_finished_p, 0); rb_define_method(cZStream, "closed?", rb_zstream_closed_p, 0); rb_define_method(cZStream, "ended?", rb_zstream_closed_p, 0); rb_define_method(cZStream, "close", rb_zstream_end, 0); rb_define_method(cZStream, "end", rb_zstream_end, 0); rb_define_method(cZStream, "reset", rb_zstream_reset, 0); rb_define_method(cZStream, "finish", rb_zstream_finish, 0); rb_define_method(cZStream, "flush_next_in", rb_zstream_flush_next_in, 0); rb_define_method(cZStream, "flush_next_out", rb_zstream_flush_next_out, 0); /* Represents binary data as guessed by deflate. * * See Zlib::Deflate#data_type. */ rb_define_const(mZlib, "BINARY", INT2FIX(Z_BINARY)); /* Represents text data as guessed by deflate. * * NOTE: The underlying constant Z_ASCII was deprecated in favor of Z_TEXT * in zlib 1.2.2. New applications should not use this constant. * * See Zlib::Deflate#data_type. */ rb_define_const(mZlib, "ASCII", INT2FIX(Z_ASCII)); #ifdef Z_TEXT /* Represents text data as guessed by deflate. * * See Zlib::Deflate#data_type. */ rb_define_const(mZlib, "TEXT", INT2FIX(Z_TEXT)); #endif /* Represents an unknown data type as guessed by deflate. * * See Zlib::Deflate#data_type. */ rb_define_const(mZlib, "UNKNOWN", INT2FIX(Z_UNKNOWN)); cDeflate = rb_define_class_under(mZlib, "Deflate", cZStream); rb_define_singleton_method(cDeflate, "deflate", rb_deflate_s_deflate, -1); rb_define_singleton_method(mZlib, "deflate", rb_deflate_s_deflate, -1); rb_define_alloc_func(cDeflate, rb_deflate_s_allocate); rb_define_method(cDeflate, "initialize", rb_deflate_initialize, -1); rb_define_method(cDeflate, "initialize_copy", rb_deflate_init_copy, 1); rb_define_method(cDeflate, "deflate", rb_deflate_deflate, -1); rb_define_method(cDeflate, "<<", rb_deflate_addstr, 1); rb_define_method(cDeflate, "flush", rb_deflate_flush, -1); rb_define_method(cDeflate, "params", rb_deflate_params, 2); rb_define_method(cDeflate, "set_dictionary", rb_deflate_set_dictionary, 1); cInflate = rb_define_class_under(mZlib, "Inflate", cZStream); rb_define_singleton_method(cInflate, "inflate", rb_inflate_s_inflate, 1); rb_define_singleton_method(mZlib, "inflate", rb_inflate_s_inflate, 1); rb_define_alloc_func(cInflate, rb_inflate_s_allocate); rb_define_method(cInflate, "initialize", rb_inflate_initialize, -1); rb_define_method(cInflate, "add_dictionary", rb_inflate_add_dictionary, 1); rb_define_method(cInflate, "inflate", rb_inflate_inflate, 1); rb_define_method(cInflate, "<<", rb_inflate_addstr, 1); rb_define_method(cInflate, "sync", rb_inflate_sync, 1); rb_define_method(cInflate, "sync_point?", rb_inflate_sync_point_p, 0); rb_define_method(cInflate, "set_dictionary", rb_inflate_set_dictionary, 1); /* No compression, passes through data untouched. Use this for appending * pre-compressed data to a deflate stream. */ rb_define_const(mZlib, "NO_COMPRESSION", INT2FIX(Z_NO_COMPRESSION)); /* Fastest compression level, but with with lowest space savings. */ rb_define_const(mZlib, "BEST_SPEED", INT2FIX(Z_BEST_SPEED)); /* Slowest compression level, but with the best space savings. */ rb_define_const(mZlib, "BEST_COMPRESSION", INT2FIX(Z_BEST_COMPRESSION)); /* Default compression level which is a good trade-off between space and * time */ rb_define_const(mZlib, "DEFAULT_COMPRESSION", INT2FIX(Z_DEFAULT_COMPRESSION)); /* Deflate strategy for data produced by a filter (or predictor). The * effect of FILTERED is to force more Huffman codes and less string * matching; it is somewhat intermediate between DEFAULT_STRATEGY and * HUFFMAN_ONLY. Filtered data consists mostly of small values with a * somewhat random distribution. */ rb_define_const(mZlib, "FILTERED", INT2FIX(Z_FILTERED)); /* Deflate strategy which uses Huffman codes only (no string matching). */ rb_define_const(mZlib, "HUFFMAN_ONLY", INT2FIX(Z_HUFFMAN_ONLY)); #ifdef Z_RLE /* Deflate compression strategy designed to be almost as fast as * HUFFMAN_ONLY, but give better compression for PNG image data. */ rb_define_const(mZlib, "RLE", INT2FIX(Z_RLE)); #endif #ifdef Z_FIXED /* Deflate strategy which prevents the use of dynamic Huffman codes, * allowing for a simpler decoder for specialized applications. */ rb_define_const(mZlib, "FIXED", INT2FIX(Z_FIXED)); #endif /* Default deflate strategy which is used for normal data. */ rb_define_const(mZlib, "DEFAULT_STRATEGY", INT2FIX(Z_DEFAULT_STRATEGY)); /* The maximum size of the zlib history buffer. Note that zlib allows * larger values to enable different inflate modes. See Zlib::Inflate.new * for details. */ rb_define_const(mZlib, "MAX_WBITS", INT2FIX(MAX_WBITS)); /* The default memory level for allocating zlib deflate compression state. */ rb_define_const(mZlib, "DEF_MEM_LEVEL", INT2FIX(DEF_MEM_LEVEL)); /* The maximum memory level for allocating zlib deflate compression state. */ rb_define_const(mZlib, "MAX_MEM_LEVEL", INT2FIX(MAX_MEM_LEVEL)); /* NO_FLUSH is the default flush method and allows deflate to decide how * much data to accumulate before producing output in order to maximize * compression. */ rb_define_const(mZlib, "NO_FLUSH", INT2FIX(Z_NO_FLUSH)); /* The SYNC_FLUSH method flushes all pending output to the output buffer * and the output is aligned on a byte boundary. Flushing may degrade * compression so it should be used only when necessary, such as at a * request or response boundary for a network stream. */ rb_define_const(mZlib, "SYNC_FLUSH", INT2FIX(Z_SYNC_FLUSH)); /* Flushes all output as with SYNC_FLUSH, and the compression state is * reset so that decompression can restart from this point if previous * compressed data has been damaged or if random access is desired. Like * SYNC_FLUSH, using FULL_FLUSH too often can seriously degrade * compression. */ rb_define_const(mZlib, "FULL_FLUSH", INT2FIX(Z_FULL_FLUSH)); /* Processes all pending input and flushes pending output. */ rb_define_const(mZlib, "FINISH", INT2FIX(Z_FINISH)); #if GZIP_SUPPORT id_write = rb_intern("write"); id_read = rb_intern("read"); id_readpartial = rb_intern("readpartial"); id_flush = rb_intern("flush"); id_seek = rb_intern("seek"); id_close = rb_intern("close"); id_path = rb_intern("path"); id_input = rb_intern("@input"); cGzipFile = rb_define_class_under(mZlib, "GzipFile", rb_cObject); cGzError = rb_define_class_under(cGzipFile, "Error", cZError); /* input gzipped string */ rb_define_attr(cGzError, "input", 1, 0); rb_define_method(cGzError, "inspect", gzfile_error_inspect, 0); cNoFooter = rb_define_class_under(cGzipFile, "NoFooter", cGzError); cCRCError = rb_define_class_under(cGzipFile, "CRCError", cGzError); cLengthError = rb_define_class_under(cGzipFile,"LengthError",cGzError); cGzipWriter = rb_define_class_under(mZlib, "GzipWriter", cGzipFile); cGzipReader = rb_define_class_under(mZlib, "GzipReader", cGzipFile); rb_include_module(cGzipReader, rb_mEnumerable); rb_define_singleton_method(cGzipFile, "wrap", rb_gzfile_s_wrap, -1); rb_undef_alloc_func(cGzipFile); rb_define_method(cGzipFile, "to_io", rb_gzfile_to_io, 0); rb_define_method(cGzipFile, "crc", rb_gzfile_crc, 0); rb_define_method(cGzipFile, "mtime", rb_gzfile_mtime, 0); rb_define_method(cGzipFile, "level", rb_gzfile_level, 0); rb_define_method(cGzipFile, "os_code", rb_gzfile_os_code, 0); rb_define_method(cGzipFile, "orig_name", rb_gzfile_orig_name, 0); rb_define_method(cGzipFile, "comment", rb_gzfile_comment, 0); rb_define_method(cGzipReader, "lineno", rb_gzfile_lineno, 0); rb_define_method(cGzipReader, "lineno=", rb_gzfile_set_lineno, 1); rb_define_method(cGzipWriter, "mtime=", rb_gzfile_set_mtime, 1); rb_define_method(cGzipWriter, "orig_name=", rb_gzfile_set_orig_name,1); rb_define_method(cGzipWriter, "comment=", rb_gzfile_set_comment, 1); rb_define_method(cGzipFile, "close", rb_gzfile_close, 0); rb_define_method(cGzipFile, "finish", rb_gzfile_finish, 0); rb_define_method(cGzipFile, "closed?", rb_gzfile_closed_p, 0); rb_define_method(cGzipReader, "eof", rb_gzfile_eof_p, 0); rb_define_method(cGzipReader, "eof?", rb_gzfile_eof_p, 0); rb_define_method(cGzipFile, "sync", rb_gzfile_sync, 0); rb_define_method(cGzipFile, "sync=", rb_gzfile_set_sync, 1); rb_define_method(cGzipReader, "pos", rb_gzfile_total_out, 0); rb_define_method(cGzipWriter, "pos", rb_gzfile_total_in, 0); rb_define_method(cGzipReader, "tell", rb_gzfile_total_out, 0); rb_define_method(cGzipWriter, "tell", rb_gzfile_total_in, 0); rb_define_singleton_method(cGzipWriter, "open", rb_gzwriter_s_open,-1); rb_define_alloc_func(cGzipWriter, rb_gzwriter_s_allocate); rb_define_method(cGzipWriter, "initialize", rb_gzwriter_initialize,-1); rb_define_method(cGzipWriter, "flush", rb_gzwriter_flush, -1); rb_define_method(cGzipWriter, "write", rb_gzwriter_write, 1); rb_define_method(cGzipWriter, "putc", rb_gzwriter_putc, 1); rb_define_method(cGzipWriter, "<<", rb_gzwriter_addstr, 1); rb_define_method(cGzipWriter, "printf", rb_gzwriter_printf, -1); rb_define_method(cGzipWriter, "print", rb_gzwriter_print, -1); rb_define_method(cGzipWriter, "puts", rb_gzwriter_puts, -1); rb_define_singleton_method(cGzipReader, "open", rb_gzreader_s_open,-1); rb_define_alloc_func(cGzipReader, rb_gzreader_s_allocate); rb_define_method(cGzipReader, "initialize", rb_gzreader_initialize, -1); rb_define_method(cGzipReader, "rewind", rb_gzreader_rewind, 0); rb_define_method(cGzipReader, "unused", rb_gzreader_unused, 0); rb_define_method(cGzipReader, "read", rb_gzreader_read, -1); rb_define_method(cGzipReader, "readpartial", rb_gzreader_readpartial, -1); rb_define_method(cGzipReader, "getc", rb_gzreader_getc, 0); rb_define_method(cGzipReader, "getbyte", rb_gzreader_getbyte, 0); rb_define_method(cGzipReader, "readchar", rb_gzreader_readchar, 0); rb_define_method(cGzipReader, "readbyte", rb_gzreader_readbyte, 0); rb_define_method(cGzipReader, "each_byte", rb_gzreader_each_byte, 0); rb_define_method(cGzipReader, "each_char", rb_gzreader_each_char, 0); rb_define_method(cGzipReader, "bytes", rb_gzreader_bytes, 0); rb_define_method(cGzipReader, "ungetc", rb_gzreader_ungetc, 1); rb_define_method(cGzipReader, "ungetbyte", rb_gzreader_ungetbyte, 1); rb_define_method(cGzipReader, "gets", rb_gzreader_gets, -1); rb_define_method(cGzipReader, "readline", rb_gzreader_readline, -1); rb_define_method(cGzipReader, "each", rb_gzreader_each, -1); rb_define_method(cGzipReader, "each_line", rb_gzreader_each, -1); rb_define_method(cGzipReader, "lines", rb_gzreader_lines, -1); rb_define_method(cGzipReader, "readlines", rb_gzreader_readlines, -1); rb_define_method(cGzipReader, "external_encoding", rb_gzreader_external_encoding, 0); /* The OS code of current host */ rb_define_const(mZlib, "OS_CODE", INT2FIX(OS_CODE)); /* OS code for MSDOS hosts */ rb_define_const(mZlib, "OS_MSDOS", INT2FIX(OS_MSDOS)); /* OS code for Amiga hosts */ rb_define_const(mZlib, "OS_AMIGA", INT2FIX(OS_AMIGA)); /* OS code for VMS hosts */ rb_define_const(mZlib, "OS_VMS", INT2FIX(OS_VMS)); /* OS code for UNIX hosts */ rb_define_const(mZlib, "OS_UNIX", INT2FIX(OS_UNIX)); /* OS code for Atari hosts */ rb_define_const(mZlib, "OS_ATARI", INT2FIX(OS_ATARI)); /* OS code for OS2 hosts */ rb_define_const(mZlib, "OS_OS2", INT2FIX(OS_OS2)); /* OS code for Mac OS hosts */ rb_define_const(mZlib, "OS_MACOS", INT2FIX(OS_MACOS)); /* OS code for TOPS-20 hosts */ rb_define_const(mZlib, "OS_TOPS20", INT2FIX(OS_TOPS20)); /* OS code for Win32 hosts */ rb_define_const(mZlib, "OS_WIN32", INT2FIX(OS_WIN32)); /* OS code for VM OS hosts */ rb_define_const(mZlib, "OS_VMCMS", INT2FIX(OS_VMCMS)); /* OS code for Z-System hosts */ rb_define_const(mZlib, "OS_ZSYSTEM", INT2FIX(OS_ZSYSTEM)); /* OS code for CP/M hosts */ rb_define_const(mZlib, "OS_CPM", INT2FIX(OS_CPM)); /* OS code for QDOS hosts */ rb_define_const(mZlib, "OS_QDOS", INT2FIX(OS_QDOS)); /* OS code for RISC OS hosts */ rb_define_const(mZlib, "OS_RISCOS", INT2FIX(OS_RISCOS)); /* OS code for unknown hosts */ rb_define_const(mZlib, "OS_UNKNOWN", INT2FIX(OS_UNKNOWN)); #endif /* GZIP_SUPPORT */ } /* Document error classes. */ /* * Document-class: Zlib::Error * * The superclass for all exceptions raised by Ruby/zlib. * * The following exceptions are defined as subclasses of Zlib::Error. These * exceptions are raised when zlib library functions return with an error * status. * * - Zlib::StreamEnd * - Zlib::NeedDict * - Zlib::DataError * - Zlib::StreamError * - Zlib::MemError * - Zlib::BufError * - Zlib::VersionError * */ /* * Document-class: Zlib::StreamEnd * * Subclass of Zlib::Error * * When zlib returns a Z_STREAM_END * is return if the end of the compressed data has been reached * and all uncompressed out put has been produced. * */ /* * Document-class: Zlib::NeedDict * * Subclass of Zlib::Error * * When zlib returns a Z_NEED_DICT * if a preset dictionary is needed at this point. * * Used by Zlib::Inflate.inflate and Zlib.inflate */ /* * Document-class: Zlib::VersionError * * Subclass of Zlib::Error * * When zlib returns a Z_VERSION_ERROR, * usually if the zlib library version is incompatible with the * version assumed by the caller. * */ /* * Document-class: Zlib::MemError * * Subclass of Zlib::Error * * When zlib returns a Z_MEM_ERROR, * usually if there was not enough memory. * */ /* * Document-class: Zlib::StreamError * * Subclass of Zlib::Error * * When zlib returns a Z_STREAM_ERROR, * usually if the stream state was inconsistent. * */ /* * Document-class: Zlib::BufError * * Subclass of Zlib::Error when zlib returns a Z_BUF_ERROR. * * Usually if no progress is possible. * */ /* * Document-class: Zlib::DataError * * Subclass of Zlib::Error when zlib returns a Z_DATA_ERROR. * * Usually if a stream was prematurely freed. * */ /* * Document-class: Zlib::GzipFile::Error * * Base class of errors that occur when processing GZIP files. */ /* * Document-class: Zlib::GzipFile::NoFooter * * Raised when gzip file footer is not found. */ /* * Document-class: Zlib::GzipFile::CRCError * * Raised when the CRC checksum recorded in gzip file footer is not equivalent * to the CRC checksum of the actual uncompressed data. */ /* * Document-class: Zlib::GzipFile::LengthError * * Raised when the data length recorded in the gzip file footer is not equivalent * to the length of the actual uncompressed data. */