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|
#ifndef RUBY_INTERNAL_ENCODING_TRANSCODE_H /*-*-C++-*-vi:se ft=cpp:*/
#define RUBY_INTERNAL_ENCODING_TRANSCODE_H
/**
* @file
* @author Ruby developers <ruby-core@ruby-lang.org>
* @copyright This file is a part of the programming language Ruby.
* Permission is hereby granted, to either redistribute and/or
* modify this file, provided that the conditions mentioned in the
* file COPYING are met. Consult the file for details.
* @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are
* implementation details. Don't take them as canon. They could
* rapidly appear then vanish. The name (path) of this header file
* is also an implementation detail. Do not expect it to persist
* at the place it is now. Developers are free to move it anywhere
* anytime at will.
* @note To ruby-core: remember that this header can be possibly
* recursively included from extension libraries written in C++.
* Do not expect for instance `__VA_ARGS__` is always available.
* We assume C99 for ruby itself but we don't assume languages of
* extension libraries. They could be written in C++98.
* @brief econv stuff
*/
#include "ruby/internal/dllexport.h"
#include "ruby/internal/value.h"
RBIMPL_SYMBOL_EXPORT_BEGIN()
/** return value of rb_econv_convert() */
typedef enum {
/**
* The conversion stopped when it found an invalid sequence.
*/
econv_invalid_byte_sequence,
/**
* The conversion stopped when it found a character in the input which
* cannot be representable in the output.
*/
econv_undefined_conversion,
/**
* The conversion stopped because there is no destination.
*/
econv_destination_buffer_full,
/**
* The conversion stopped because there is no input.
*/
econv_source_buffer_empty,
/**
* The conversion stopped after converting everything. This is arguably
* the expected normal end of conversion.
*/
econv_finished,
/**
* The conversion stopped after writing something to somewhere, before
* reading everything.
*/
econv_after_output,
/**
* The conversion stopped in middle of reading a character, possibly due to
* a partial read of a socket etc.
*/
econv_incomplete_input
} rb_econv_result_t;
/** An opaque struct that represents a lowest level of encoding conversion. */
typedef struct rb_econv_t rb_econv_t;
/**
* Converts the contents of the passed string from its encoding to the passed
* one.
*
* @param[in] str Target string.
* @param[in] to Destination encoding.
* @param[in] ecflags A set of enum
* ::ruby_econv_flag_type.
* @param[in] ecopts A keyword hash, like
* ::rb_io_t::rb_io_enc_t::ecopts.
* @exception rb_eArgError Not fully converted.
* @exception rb_eInvalidByteSequenceError `str` is malformed.
* @exception rb_eUndefinedConversionError `str` has a character not
* representable using `to`.
* @exception rb_eConversionNotFoundError There is no known conversion from
* `str`'s encoding to `to`.
* @return A string whose encoding is `to`, and whose contents is converted
* contents of `str`.
* @note Use rb_econv_prepare_options() to generate `ecopts`.
*/
VALUE rb_str_encode(VALUE str, VALUE to, int ecflags, VALUE ecopts);
/**
* Queries if there is more than one way to convert between the passed two
* encodings. Encoding conversion are has_and_belongs_to_many relationships.
* There could be no direct conversion defined for the passed pair. Ruby tries
* to find an indirect way to do so then. For instance ISO-8859-1 has no
* direct conversion to ISO-2022-JP. But there is ISO-8859-1 to UTF-8
* conversion; then there is UTF-8 to EUC-JP conversion; finally there also is
* EUC-JP to ISO-2022-JP conversion. So in short ISO-8859-1 can be converted
* to ISO-2022-JP using that path. This function returns true. Obviously not
* everything that can be represented using UTF-8 can also be represented using
* EUC-JP. Conversions in practice can fail depending on the actual input, and
* that renders exceptions in case of rb_str_encode().
*
* @param[in] from_encoding One encoding.
* @param[in] to_encoding Another encoding.
* @retval 0 No way to convert the two.
* @retval 1 At least one way to convert the two.
*
* @internal
*
* Practically @shyouhei knows no way for this function to return 0. It seems
* everything can eventually be converted to/from UTF-8, which connects
* everything.
*/
int rb_econv_has_convpath_p(const char* from_encoding, const char* to_encoding);
/**
* Identical to rb_econv_prepare_opts(), except it additionally takes the
* initial value of flags. The extra bits are bitwise-ORed to the return
* value.
*
* @param[in] opthash Keyword arguments.
* @param[out] ecopts Return buffer.
* @param[in] ecflags Default set of enum ::ruby_econv_flag_type.
* @exception rb_eArgError Unknown/Broken values passed.
* @return Calculated set of enum ::ruby_econv_flag_type.
* @post `ecopts` holds a hash object suitable for
* ::rb_io_t::rb_io_enc_t::ecopts.
*/
int rb_econv_prepare_options(VALUE opthash, VALUE *ecopts, int ecflags);
/**
* Splits a keyword arguments hash (that for instance `String#encode` took)
* into a set of enum ::ruby_econv_flag_type and a hash storing replacement
* characters etc.
*
* @param[in] opthash Keyword arguments.
* @param[out] ecopts Return buffer.
* @exception rb_eArgError Unknown/Broken values passed.
* @return Calculated set of enum ::ruby_econv_flag_type.
* @post `ecopts` holds a hash object suitable for
* ::rb_io_t::rb_io_enc_t::ecopts.
*/
int rb_econv_prepare_opts(VALUE opthash, VALUE *ecopts);
/**
* Creates a new instance of struct ::rb_econv_t.
*
* @param[in] source_encoding Name of an encoding.
* @param[in] destination_encoding Name of another encoding.
* @param[in] ecflags A set of enum ::ruby_econv_flag_type.
* @exception rb_eArgError No such encoding.
* @retval NULL Failed to create a struct ::rb_econv_t.
* @retval otherwise Allocated struct ::rb_econv_t.
* @warning Return value must be passed to rb_econv_close() exactly once.
*/
rb_econv_t *rb_econv_open(const char *source_encoding, const char *destination_encoding, int ecflags);
/**
* Identical to rb_econv_open(), except it additionally takes a hash of
* optional strings.
*
*
* @param[in] source_encoding Name of an encoding.
* @param[in] destination_encoding Name of another encoding.
* @param[in] ecflags A set of enum ::ruby_econv_flag_type.
* @param[in] ecopts Optional set of strings.
* @exception rb_eArgError No such encoding.
* @retval NULL Failed to create a struct ::rb_econv_t.
* @retval otherwise Allocated struct ::rb_econv_t.
* @warning Return value must be passed to rb_econv_close() exactly once.
*/
rb_econv_t *rb_econv_open_opts(const char *source_encoding, const char *destination_encoding, int ecflags, VALUE ecopts);
/**
* Converts a string from an encoding to another.
*
* Possible flags are either ::RUBY_ECONV_PARTIAL_INPUT (means the source
* buffer is a part of much larger one), ::RUBY_ECONV_AFTER_OUTPUT (instructs
* the converter to stop after output before input), or both of them.
*
* @param[in,out] ec Conversion specification/state etc.
* @param[in] source_buffer_ptr Target string.
* @param[in] source_buffer_end End of target string.
* @param[out] destination_buffer_ptr Return buffer.
* @param[out] destination_buffer_end End of return buffer.
* @param[in] flags Flags (see above).
* @return The status of the conversion.
* @post `destination_buffer_ptr` holds conversion results.
*/
rb_econv_result_t rb_econv_convert(rb_econv_t *ec,
const unsigned char **source_buffer_ptr, const unsigned char *source_buffer_end,
unsigned char **destination_buffer_ptr, unsigned char *destination_buffer_end,
int flags);
/**
* Destructs a converter. Note that a converter can have a buffer, and can be
* non-empty. Calling this would lose your data then.
*
* @param[out] ec The converter to destroy.
* @post `ec` is no longer a valid pointer.
*/
void rb_econv_close(rb_econv_t *ec);
/**
* Assigns the replacement string. The string passed here would appear in
* converted string when it cannot represent its source counterpart. This can
* happen for instance you convert an emoji to ISO-8859-1.
*
* @param[out] ec Target converter.
* @param[in] str Replacement string.
* @param[in] len Number of bytes of `str`.
* @param[in] encname Name of encoding of `str`.
* @retval 0 Success.
* @retval -1 Failure (ENOMEM etc.).
* @post `ec`'s replacement string is set to `str`.
*/
int rb_econv_set_replacement(rb_econv_t *ec, const unsigned char *str, size_t len, const char *encname);
/**
* "Decorate"s a converter. There are special kind of converters that
* transforms the contents, like replacing CR into CRLF. You can add such
* decorators to a converter using this API. By using this function a
* decorator is prepended at the beginning of a conversion sequence: in case of
* CRLF conversion, newlines are converted before encodings are converted.
*
* @param[out] ec Target converter to decorate.
* @param[in] decorator_name Name of decorator to prepend.
* @retval 0 Success.
* @retval -1 Failure (no such decorator etc.).
* @post Decorator works before encoding conversion happens.
*
* @internal
*
* What is the possible value of the `decorator_name` is not public. You have
* to read through `transcode.c` carefully.
*/
int rb_econv_decorate_at_first(rb_econv_t *ec, const char *decorator_name);
/**
* Identical to rb_econv_decorate_at_first(), except it adds to the opposite
* direction. For instance CRLF conversion would run _after_ encodings are
* converted.
*
* @param[out] ec Target converter to decorate.
* @param[in] decorator_name Name of decorator to prepend.
* @retval 0 Success.
* @retval -1 Failure (no such decorator etc.).
* @post Decorator works after encoding conversion happens.
*/
int rb_econv_decorate_at_last(rb_econv_t *ec, const char *decorator_name);
/**
* Creates a `rb_eConverterNotFoundError` exception object (but does not
* raise).
*
* @param[in] senc Name of source encoding.
* @param[in] denc Name of destination encoding.
* @param[in] ecflags A set of enum ::ruby_econv_flag_type.
* @return An instance of `rb_eConverterNotFoundError`.
*/
VALUE rb_econv_open_exc(const char *senc, const char *denc, int ecflags);
/**
* Appends the passed string to the passed converter's output buffer. This can
* be handy when an encoding needs bytes out of thin air; for instance
* ISO-2022-JP has "shift function" which does not correspond to any
* characters.
*
* @param[out] ec Target converter.
* @param[in] str String to insert.
* @param[in] len Number of bytes of `str`.
* @param[in] str_encoding Encoding of `str`.
* @retval 0 Success.
* @retval -1 Failure (conversion error etc.).
* @note `str_encoding` can be anything, and `str` itself is converted
* when necessary.
*/
int rb_econv_insert_output(rb_econv_t *ec,
const unsigned char *str, size_t len, const char *str_encoding);
/**
* Queries an encoding name which best suits for rb_econv_insert_output()'s
* last parameter. Strings in this encoding need no conversion when inserted;
* can be both time/space efficient.
*
* @param[in] ec Target converter.
* @return Its encoding for insertion.
*/
const char *rb_econv_encoding_to_insert_output(rb_econv_t *ec);
/**
* This is a rb_econv_make_exception() + rb_exc_raise() combo.
*
* @param[in] ec (Possibly failed) conversion.
* @exception rb_eInvalidByteSequenceError Invalid byte sequence.
* @exception rb_eUndefinedConversionError Conversion undefined.
* @note This function can return when no error.
*/
void rb_econv_check_error(rb_econv_t *ec);
/**
* This function makes sense right after rb_econv_convert() returns. As listed
* in ::rb_econv_result_t, rb_econv_convert() can bail out for various reasons.
* This function checks the passed converter's internal state and convert it to
* an appropriate exception object.
*
* @param[in] ec Target converter.
* @retval RUBY_Qnil The converter has no error.
* @retval otherwise Conversion error turned into an exception.
*/
VALUE rb_econv_make_exception(rb_econv_t *ec);
/**
* Queries if rb_econv_putback() makes sense, i.e. there are invalid byte
* sequences remain in the buffer.
*
* @param[in] ec Target converter.
* @return Number of bytes that can be pushed back.
*/
int rb_econv_putbackable(rb_econv_t *ec);
/**
* Puts back the bytes. In case of ::econv_invalid_byte_sequence, some of
* those invalid bytes are discarded and the others are buffered to be
* converted later. The latter bytes can be put back using this API.
*
* @param[out] ec Target converter (invalid byte sequence).
* @param[out] p Return buffer.
* @param[in] n Max number of bytes to put back.
* @post At most `n` bytes of what was put back is written to `p`.
*/
void rb_econv_putback(rb_econv_t *ec, unsigned char *p, int n);
/**
* Queries the passed encoding's corresponding ASCII compatible encoding. "The
* corresponding ASCII compatible encoding" in this context is an ASCII
* compatible encoding which can represent exactly the same character sets as
* the given ASCII incompatible encoding. For instance that of UTF-16LE is
* UTF-8.
*
* @param[in] encname Name of an ASCII incompatible encoding.
* @retval NULL `encname` is already ASCII compatible.
* @retval otherwise The corresponding ASCII compatible encoding.
*/
const char *rb_econv_asciicompat_encoding(const char *encname);
/**
* Identical to rb_econv_convert(), except it takes Ruby's string instead of
* C's pointer.
*
* @param[in,out] ec Target converter.
* @param[in] src Source string.
* @param[in] flags Flags (see rb_econv_convert).
* @exception rb_eArgError Converted string is too long.
* @exception rb_eInvalidByteSequenceError Invalid byte sequence.
* @exception rb_eUndefinedConversionError Conversion undefined.
* @return The conversion result.
*/
VALUE rb_econv_str_convert(rb_econv_t *ec, VALUE src, int flags);
/**
* Identical to rb_econv_str_convert(), except it converts only a part of the
* passed string. Can be handy when you for instance want to do line-buffered
* conversion.
*
* @param[in,out] ec Target converter.
* @param[in] src Source string.
* @param[in] byteoff Number of bytes to seek.
* @param[in] bytesize Number of bytes to read.
* @param[in] flags Flags (see rb_econv_convert).
* @exception rb_eArgError Converted string is too long.
* @exception rb_eInvalidByteSequenceError Invalid byte sequence.
* @exception rb_eUndefinedConversionError Conversion undefined.
* @return The conversion result.
*/
VALUE rb_econv_substr_convert(rb_econv_t *ec, VALUE src, long byteoff, long bytesize, int flags);
/**
* Identical to rb_econv_str_convert(), except it appends the conversion result
* to the additionally passed string instead of creating a new string. It can
* also be seen as a routine identical to rb_econv_append(), except it takes a
* Ruby's string instead of C's pointer.
*
* @param[in,out] ec Target converter.
* @param[in] src Source string.
* @param[in] dst Return buffer.
* @param[in] flags Flags (see rb_econv_convert).
* @exception rb_eArgError Converted string is too long.
* @exception rb_eInvalidByteSequenceError Invalid byte sequence.
* @exception rb_eUndefinedConversionError Conversion undefined.
* @return The conversion result.
*/
VALUE rb_econv_str_append(rb_econv_t *ec, VALUE src, VALUE dst, int flags);
/**
* Identical to rb_econv_str_append(), except it appends only a part of the
* passed string with conversion. It can also be seen as a routine identical
* to rb_econv_substr_convert(), except it appends the conversion result to the
* additionally passed string instead of creating a new string.
*
* @param[in,out] ec Target converter.
* @param[in] src Source string.
* @param[in] byteoff Number of bytes to seek.
* @param[in] bytesize Number of bytes to read.
* @param[in] dst Return buffer.
* @param[in] flags Flags (see rb_econv_convert).
* @exception rb_eArgError Converted string is too long.
* @exception rb_eInvalidByteSequenceError Invalid byte sequence.
* @exception rb_eUndefinedConversionError Conversion undefined.
* @return The conversion result.
*/
VALUE rb_econv_substr_append(rb_econv_t *ec, VALUE src, long byteoff, long bytesize, VALUE dst, int flags);
/**
* Converts the passed C's pointer according to the passed converter, then
* append the conversion result to the passed Ruby's string. This way buffer
* overflow is properly avoided to resize the destination properly.
*
* @param[in,out] ec Target converter.
* @param[in] bytesrc Target string.
* @param[in] bytesize Number of bytes of `bytesrc`.
* @param[in] dst Return buffer.
* @param[in] flags Flags (see rb_econv_convert).
* @exception rb_eArgError Converted string is too long.
* @exception rb_eInvalidByteSequenceError Invalid byte sequence.
* @exception rb_eUndefinedConversionError Conversion undefined.
* @return The conversion result.
*/
VALUE rb_econv_append(rb_econv_t *ec, const char *bytesrc, long bytesize, VALUE dst, int flags);
/**
* This badly named function does not set the destination encoding to binary,
* but instead just nullifies newline conversion decorators if any. Other
* ordinal character conversions still happen after this; something non-binary
* would still be generated.
*
* @param[out] ec Target converter to modify.
* @post Any newline conversions, if any, would be killed.
*/
void rb_econv_binmode(rb_econv_t *ec);
/**
* This enum is kind of omnibus. Gathers various constants.
*/
enum ruby_econv_flag_type {
/**
* @name Flags for rb_econv_open()
*
* @{
*/
/** Mask for error handling related bits. */
RUBY_ECONV_ERROR_HANDLER_MASK = 0x000000ff,
/** Special handling of invalid sequences are there. */
RUBY_ECONV_INVALID_MASK = 0x0000000f,
/** Invalid sequences shall be replaced. */
RUBY_ECONV_INVALID_REPLACE = 0x00000002,
/** Special handling of undefined conversion are there. */
RUBY_ECONV_UNDEF_MASK = 0x000000f0,
/** Undefined characters shall be replaced. */
RUBY_ECONV_UNDEF_REPLACE = 0x00000020,
/** Undefined characters shall be escaped. */
RUBY_ECONV_UNDEF_HEX_CHARREF = 0x00000030,
/** Decorators are there. */
RUBY_ECONV_DECORATOR_MASK = 0x0001ff00,
/** Newline converters are there. */
RUBY_ECONV_NEWLINE_DECORATOR_MASK = 0x00007f00,
/** (Unclear; seems unused). */
RUBY_ECONV_NEWLINE_DECORATOR_READ_MASK = 0x00000f00,
/** (Unclear; seems unused). */
RUBY_ECONV_NEWLINE_DECORATOR_WRITE_MASK = 0x00007000,
/** Universal newline mode. */
RUBY_ECONV_UNIVERSAL_NEWLINE_DECORATOR = 0x00000100,
/** CR to CRLF conversion shall happen. */
RUBY_ECONV_CRLF_NEWLINE_DECORATOR = 0x00001000,
/** CRLF to CR conversion shall happen. */
RUBY_ECONV_CR_NEWLINE_DECORATOR = 0x00002000,
/** CRLF to LF conversion shall happen. */
RUBY_ECONV_LF_NEWLINE_DECORATOR = 0x00004000,
/** Texts shall be XML-escaped. */
RUBY_ECONV_XML_TEXT_DECORATOR = 0x00008000,
/** Texts shall be AttrValue escaped */
RUBY_ECONV_XML_ATTR_CONTENT_DECORATOR = 0x00010000,
/** (Unclear; seems unused). */
RUBY_ECONV_STATEFUL_DECORATOR_MASK = 0x00f00000,
/** Texts shall be AttrValue escaped. */
RUBY_ECONV_XML_ATTR_QUOTE_DECORATOR = 0x00100000,
/** Newline decorator's default. */
RUBY_ECONV_DEFAULT_NEWLINE_DECORATOR =
#if defined(RUBY_TEST_CRLF_ENVIRONMENT) || defined(_WIN32)
RUBY_ECONV_CRLF_NEWLINE_DECORATOR,
#else
0,
#endif
#define ECONV_ERROR_HANDLER_MASK RUBY_ECONV_ERROR_HANDLER_MASK /**< @old{RUBY_ECONV_ERROR_HANDLER_MASK} */
#define ECONV_INVALID_MASK RUBY_ECONV_INVALID_MASK /**< @old{RUBY_ECONV_INVALID_MASK} */
#define ECONV_INVALID_REPLACE RUBY_ECONV_INVALID_REPLACE /**< @old{RUBY_ECONV_INVALID_REPLACE} */
#define ECONV_UNDEF_MASK RUBY_ECONV_UNDEF_MASK /**< @old{RUBY_ECONV_UNDEF_MASK} */
#define ECONV_UNDEF_REPLACE RUBY_ECONV_UNDEF_REPLACE /**< @old{RUBY_ECONV_UNDEF_REPLACE} */
#define ECONV_UNDEF_HEX_CHARREF RUBY_ECONV_UNDEF_HEX_CHARREF /**< @old{RUBY_ECONV_UNDEF_HEX_CHARREF} */
#define ECONV_DECORATOR_MASK RUBY_ECONV_DECORATOR_MASK /**< @old{RUBY_ECONV_DECORATOR_MASK} */
#define ECONV_NEWLINE_DECORATOR_MASK RUBY_ECONV_NEWLINE_DECORATOR_MASK /**< @old{RUBY_ECONV_NEWLINE_DECORATOR_MASK} */
#define ECONV_NEWLINE_DECORATOR_READ_MASK RUBY_ECONV_NEWLINE_DECORATOR_READ_MASK /**< @old{RUBY_ECONV_NEWLINE_DECORATOR_READ_MASK} */
#define ECONV_NEWLINE_DECORATOR_WRITE_MASK RUBY_ECONV_NEWLINE_DECORATOR_WRITE_MASK /**< @old{RUBY_ECONV_NEWLINE_DECORATOR_WRITE_MASK} */
#define ECONV_UNIVERSAL_NEWLINE_DECORATOR RUBY_ECONV_UNIVERSAL_NEWLINE_DECORATOR /**< @old{RUBY_ECONV_UNIVERSAL_NEWLINE_DECORATOR} */
#define ECONV_CRLF_NEWLINE_DECORATOR RUBY_ECONV_CRLF_NEWLINE_DECORATOR /**< @old{RUBY_ECONV_CRLF_NEWLINE_DECORATOR} */
#define ECONV_CR_NEWLINE_DECORATOR RUBY_ECONV_CR_NEWLINE_DECORATOR /**< @old{RUBY_ECONV_CR_NEWLINE_DECORATOR} */
#define ECONV_LF_NEWLINE_DECORATOR RUBY_ECONV_LF_NEWLINE_DECORATOR /**< @old{RUBY_ECONV_LF_NEWLINE_DECORATOR} */
#define ECONV_XML_TEXT_DECORATOR RUBY_ECONV_XML_TEXT_DECORATOR /**< @old{RUBY_ECONV_XML_TEXT_DECORATOR} */
#define ECONV_XML_ATTR_CONTENT_DECORATOR RUBY_ECONV_XML_ATTR_CONTENT_DECORATOR /**< @old{RUBY_ECONV_XML_ATTR_CONTENT_DECORATOR} */
#define ECONV_STATEFUL_DECORATOR_MASK RUBY_ECONV_STATEFUL_DECORATOR_MASK /**< @old{RUBY_ECONV_STATEFUL_DECORATOR_MASK} */
#define ECONV_XML_ATTR_QUOTE_DECORATOR RUBY_ECONV_XML_ATTR_QUOTE_DECORATOR /**< @old{RUBY_ECONV_XML_ATTR_QUOTE_DECORATOR} */
#define ECONV_DEFAULT_NEWLINE_DECORATOR RUBY_ECONV_DEFAULT_NEWLINE_DECORATOR /**< @old{RUBY_ECONV_DEFAULT_NEWLINE_DECORATOR} */
/** @} */
/**
* @name Flags for rb_econv_convert()
*
* @{
*/
/** Indicates the input is a part of much larger one. */
RUBY_ECONV_PARTIAL_INPUT = 0x00020000,
/** Instructs the converter to stop after output. */
RUBY_ECONV_AFTER_OUTPUT = 0x00040000,
#define ECONV_PARTIAL_INPUT RUBY_ECONV_PARTIAL_INPUT /**< @old{RUBY_ECONV_PARTIAL_INPUT} */
#define ECONV_AFTER_OUTPUT RUBY_ECONV_AFTER_OUTPUT /**< @old{RUBY_ECONV_AFTER_OUTPUT} */
RUBY_ECONV_FLAGS_PLACEHOLDER /**< Placeholder (not used) */
};
RBIMPL_SYMBOL_EXPORT_END()
#endif /* RUBY_INTERNAL_ENCODING_TRANSCODE_H */
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