diff options
Diffstat (limited to 'io.c')
-rw-r--r-- | io.c | 68 |
1 files changed, 33 insertions, 35 deletions
@@ -4900,65 +4900,63 @@ static void io_encoding_set(rb_io_t *, VALUE, VALUE, VALUE); static int io_strip_bom(VALUE io) { - int b1, b2, b3, b4; - switch (b1 = FIX2INT(rb_io_getbyte(io))) { - case 0xEF: - b2 = FIX2INT(rb_io_getbyte(io)); - if (b2 == 0xBB) { - b3 = FIX2INT(rb_io_getbyte(io)); - if (b3 == 0xBF) { + VALUE b1, b2, b3, b4; + + if (NIL_P(b1 = rb_io_getbyte(io))) return 0; + switch (b1) { + case INT2FIX(0xEF): + if (NIL_P(b2 = rb_io_getbyte(io))) break; + if (b2 == INT2FIX(0xBB) && !NIL_P(b3 = rb_io_getbyte(io))) { + if (b3 == INT2FIX(0xBF)) { return rb_utf8_encindex(); } - rb_io_ungetbyte(io, INT2FIX(b3)); + rb_io_ungetbyte(io, b3); } - rb_io_ungetbyte(io, INT2FIX(b2)); + rb_io_ungetbyte(io, b2); break; - case 0xFE: - b2 = FIX2INT(rb_io_getbyte(io)); - if (b2 == 0xFF) { + case INT2FIX(0xFE): + if (NIL_P(b2 = rb_io_getbyte(io))) break; + if (b2 == INT2FIX(0xFF)) { return rb_enc_find_index("UTF-16BE"); } - rb_io_ungetbyte(io, INT2FIX(b2)); + rb_io_ungetbyte(io, b2); break; - case 0xFF: - b2 = FIX2INT(rb_io_getbyte(io)); - if (b2 == 0xFE) { - b3 = FIX2INT(rb_io_getbyte(io)); - if (b3 == 0) { - b4 = FIX2INT(rb_io_getbyte(io)); - if (b4 == 0) { + case INT2FIX(0xFF): + if (NIL_P(b2 = rb_io_getbyte(io))) break; + if (b2 == INT2FIX(0xFE)) { + b3 = rb_io_getbyte(io); + if (b3 == INT2FIX(0) && !NIL_P(b4 = rb_io_getbyte(io))) { + if (b4 == INT2FIX(0)) { return rb_enc_find_index("UTF-32LE"); } - rb_io_ungetbyte(io, INT2FIX(b4)); + rb_io_ungetbyte(io, b4); + rb_io_ungetbyte(io, b3); } else { - rb_io_ungetbyte(io, INT2FIX(b3)); + rb_io_ungetbyte(io, b3); return rb_enc_find_index("UTF-16LE"); } - rb_io_ungetbyte(io, INT2FIX(b3)); } - rb_io_ungetbyte(io, INT2FIX(b2)); + rb_io_ungetbyte(io, b2); break; - case 0: - b2 = FIX2INT(rb_io_getbyte(io)); - if (b2 == 0) { - b3 = FIX2INT(rb_io_getbyte(io)); - if (b3 == 0xFE) { - b4 = FIX2INT(rb_io_getbyte(io)); - if (b4 == 0xFF) { + case INT2FIX(0): + if (NIL_P(b2 = rb_io_getbyte(io))) break; + if (b2 == INT2FIX(0) && !NIL_P(b3 = rb_io_getbyte(io))) { + if (b3 == INT2FIX(0xFE) && !NIL_P(b4 = rb_io_getbyte(io))) { + if (b4 == INT2FIX(0xFF)) { return rb_enc_find_index("UTF-32BE"); } - rb_io_ungetbyte(io, INT2FIX(b4)); + rb_io_ungetbyte(io, b4); } - rb_io_ungetbyte(io, INT2FIX(b3)); + rb_io_ungetbyte(io, b3); } - rb_io_ungetbyte(io, INT2FIX(b2)); + rb_io_ungetbyte(io, b2); break; } - rb_io_ungetbyte(io, INT2FIX(b1)); + rb_io_ungetbyte(io, b1); return 0; } |