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(svn r26797) -Codechange: rewrite the UTF8 reading code to make use of already existing functions instead of partially trying to implemented them

release/1.5
rubidium 2014-09-07 16:03:41 +00:00
parent 385d3d3947
commit 876cc82f33
1 changed files with 12 additions and 25 deletions
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37
src/script/squirrel.cpp
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@ -389,33 +389,20 @@ static WChar _io_file_lexfeed_ASCII(SQUserPointer file)
static WChar _io_file_lexfeed_UTF8(SQUserPointer file) static WChar _io_file_lexfeed_UTF8(SQUserPointer file)
{ {
static const SQInteger utf8_lengths[16] = char buffer[5];
{
1, 1, 1, 1, 1, 1, 1, 1, /* 0000 to 0111 : 1 byte (plain ASCII) */
0, 0, 0, 0, /* 1000 to 1011 : not valid */
2, 2, /* 1100, 1101 : 2 bytes */
3, /* 1110 : 3 bytes */
4 /* 1111 : 4 bytes */
};
static unsigned char byte_masks[5] = {0, 0, 0x1F, 0x0F, 0x07};
unsigned char inchar;
WChar c = 0;
if (((SQFile *)file)->Read(&inchar, sizeof(inchar), 1) != 1) return 0;
c = inchar;
if (c >= 0x80) { /* Read the first character, and get the length based on UTF-8 specs. If invalid, bail out. */
SQInteger tmp; if (((SQFile *)file)->Read(buffer, sizeof(buffer[0]), 1) != 1) return 0;
SQInteger codelen = utf8_lengths[c >> 4]; uint len = Utf8EncodedCharLen(buffer[0]);
if (codelen == 0) return 0; if (len == 0) return -1;
/* Read the remaining bits. */
if (len > 1 && ((SQFile *)file)->Read(buffer + 1, sizeof(buffer[0]), len - 1) != len - 1) return 0;
/* Convert the character, and when definitely invalid, bail out as well. */
WChar c;
if (Utf8Decode(&c, buffer) != len) return -1;
tmp = c & byte_masks[codelen];
for (SQInteger n = 0; n < codelen - 1; n++) {
tmp <<= 6;
if (((SQFile *)file)->Read(&inchar, sizeof(inchar), 1) != 1) return 0;
tmp |= inchar & 0x3F;
}
c = tmp;
}
return c; return c;
} }