physfs_unicode.c
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#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
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#include "physfs_casefolding.h"
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/*
* From rfc3629, the UTF-8 spec:
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* https://www.ietf.org/rfc/rfc3629.txt
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*
* Char. number range | UTF-8 octet sequence
* (hexadecimal) | (binary)
* --------------------+---------------------------------------------
* 0000 0000-0000 007F | 0xxxxxxx
* 0000 0080-0000 07FF | 110xxxxx 10xxxxxx
* 0000 0800-0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx
* 0001 0000-0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
*/
/*
* This may not be the best value, but it's one that isn't represented
* in Unicode (0x10FFFF is the largest codepoint value). We return this
* value from utf8codepoint() if there's bogus bits in the
* stream. utf8codepoint() will turn this value into something
* reasonable (like a question mark), for text that wants to try to recover,
* whereas utf8valid() will use the value to determine if a string has bad
* bits.
*/
#define UNICODE_BOGUS_CHAR_VALUE 0xFFFFFFFF
/*
* This is the codepoint we currently return when there was bogus bits in a
* UTF-8 string. May not fly in Asian locales?
*/
#define UNICODE_BOGUS_CHAR_CODEPOINT '?'
static PHYSFS_uint32 utf8codepoint(const char **_str)
{
const char *str = *_str;
PHYSFS_uint32 retval = 0;
PHYSFS_uint32 octet = (PHYSFS_uint32) ((PHYSFS_uint8) *str);
PHYSFS_uint32 octet2, octet3, octet4;
if (octet == 0) /* null terminator, end of string. */
return 0;
else if (octet < 128) /* one octet char: 0 to 127 */
{
(*_str)++; /* skip to next possible start of codepoint. */
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} /* else if */
else if ((octet > 127) && (octet < 192)) /* bad (starts with 10xxxxxx). */
{
/*
* Apparently each of these is supposed to be flagged as a bogus
* char, instead of just resyncing to the next valid codepoint.
*/
(*_str)++; /* skip to next possible start of codepoint. */
return UNICODE_BOGUS_CHAR_VALUE;
} /* else if */
else if (octet < 224) /* two octets */
{
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(*_str)++; /* advance at least one byte in case of an error */
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octet -= (128+64);
octet2 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
if ((octet2 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
return UNICODE_BOGUS_CHAR_VALUE;
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*_str += 1; /* skip to next possible start of codepoint. */
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retval = ((octet << 6) | (octet2 - 128));
if ((retval >= 0x80) && (retval <= 0x7FF))
return retval;
} /* else if */
else if (octet < 240) /* three octets */
{
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(*_str)++; /* advance at least one byte in case of an error */
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octet -= (128+64+32);
octet2 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
if ((octet2 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
return UNICODE_BOGUS_CHAR_VALUE;
octet3 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
if ((octet3 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
return UNICODE_BOGUS_CHAR_VALUE;
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*_str += 2; /* skip to next possible start of codepoint. */
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retval = ( ((octet << 12)) | ((octet2-128) << 6) | ((octet3-128)) );
/* There are seven "UTF-16 surrogates" that are illegal in UTF-8. */
switch (retval)
{
case 0xD800:
case 0xDB7F:
case 0xDB80:
case 0xDBFF:
case 0xDC00:
case 0xDF80:
case 0xDFFF:
return UNICODE_BOGUS_CHAR_VALUE;
} /* switch */
/* 0xFFFE and 0xFFFF are illegal, too, so we check them at the edge. */
if ((retval >= 0x800) && (retval <= 0xFFFD))
return retval;
} /* else if */
else if (octet < 248) /* four octets */
{
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(*_str)++; /* advance at least one byte in case of an error */
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octet -= (128+64+32+16);
octet2 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
if ((octet2 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
return UNICODE_BOGUS_CHAR_VALUE;
octet3 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
if ((octet3 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
return UNICODE_BOGUS_CHAR_VALUE;
octet4 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
if ((octet4 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
return UNICODE_BOGUS_CHAR_VALUE;
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*_str += 3; /* skip to next possible start of codepoint. */
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retval = ( ((octet << 18)) | ((octet2 - 128) << 12) |
((octet3 - 128) << 6) | ((octet4 - 128)) );
if ((retval >= 0x10000) && (retval <= 0x10FFFF))
return retval;
} /* else if */
/*
* Five and six octet sequences became illegal in rfc3629.
* We throw the codepoint away, but parse them to make sure we move
* ahead the right number of bytes and don't overflow the buffer.
*/
else if (octet < 252) /* five octets */
{
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(*_str)++; /* advance at least one byte in case of an error */
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octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
return UNICODE_BOGUS_CHAR_VALUE;
octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
return UNICODE_BOGUS_CHAR_VALUE;
octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
return UNICODE_BOGUS_CHAR_VALUE;
octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
return UNICODE_BOGUS_CHAR_VALUE;
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*_str += 4; /* skip to next possible start of codepoint. */
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return UNICODE_BOGUS_CHAR_VALUE;
} /* else if */
else /* six octets */
{
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(*_str)++; /* advance at least one byte in case of an error */
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octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
return UNICODE_BOGUS_CHAR_VALUE;
octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
return UNICODE_BOGUS_CHAR_VALUE;
octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
return UNICODE_BOGUS_CHAR_VALUE;
octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
return UNICODE_BOGUS_CHAR_VALUE;
octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
return UNICODE_BOGUS_CHAR_VALUE;
*_str += 6; /* skip to next possible start of codepoint. */
return UNICODE_BOGUS_CHAR_VALUE;
} /* else if */
return UNICODE_BOGUS_CHAR_VALUE;
} /* utf8codepoint */
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void PHYSFS_utf8ToUcs4(const char *src, PHYSFS_uint32 *dst, PHYSFS_uint64 len)
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{
len -= sizeof (PHYSFS_uint32); /* save room for null char. */
while (len >= sizeof (PHYSFS_uint32))
{
PHYSFS_uint32 cp = utf8codepoint(&src);
if (cp == 0)
break;
else if (cp == UNICODE_BOGUS_CHAR_VALUE)
cp = UNICODE_BOGUS_CHAR_CODEPOINT;
*(dst++) = cp;
len -= sizeof (PHYSFS_uint32);
} /* while */
*dst = 0;
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} /* PHYSFS_utf8ToUcs4 */
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void PHYSFS_utf8ToUcs2(const char *src, PHYSFS_uint16 *dst, PHYSFS_uint64 len)
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{
len -= sizeof (PHYSFS_uint16); /* save room for null char. */
while (len >= sizeof (PHYSFS_uint16))
{
PHYSFS_uint32 cp = utf8codepoint(&src);
if (cp == 0)
break;
else if (cp == UNICODE_BOGUS_CHAR_VALUE)
cp = UNICODE_BOGUS_CHAR_CODEPOINT;
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if (cp > 0xFFFF) /* UTF-16 surrogates (bogus chars in UCS-2) */
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cp = UNICODE_BOGUS_CHAR_CODEPOINT;
*(dst++) = cp;
len -= sizeof (PHYSFS_uint16);
} /* while */
*dst = 0;
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} /* PHYSFS_utf8ToUcs2 */
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void PHYSFS_utf8ToUtf16(const char *src, PHYSFS_uint16 *dst, PHYSFS_uint64 len)
{
len -= sizeof (PHYSFS_uint16); /* save room for null char. */
while (len >= sizeof (PHYSFS_uint16))
{
PHYSFS_uint32 cp = utf8codepoint(&src);
if (cp == 0)
break;
else if (cp == UNICODE_BOGUS_CHAR_VALUE)
cp = UNICODE_BOGUS_CHAR_CODEPOINT;
if (cp > 0xFFFF) /* encode as surrogate pair */
{
if (len < (sizeof (PHYSFS_uint16) * 2))
break; /* not enough room for the pair, stop now. */
cp -= 0x10000; /* Make this a 20-bit value */
*(dst++) = 0xD800 + ((cp >> 10) & 0x3FF);
len -= sizeof (PHYSFS_uint16);
cp = 0xDC00 + (cp & 0x3FF);
} /* if */
*(dst++) = cp;
len -= sizeof (PHYSFS_uint16);
} /* while */
*dst = 0;
} /* PHYSFS_utf8ToUtf16 */
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static void utf8fromcodepoint(PHYSFS_uint32 cp, char **_dst, PHYSFS_uint64 *_len)
{
char *dst = *_dst;
PHYSFS_uint64 len = *_len;
if (len == 0)
return;
if (cp > 0x10FFFF)
cp = UNICODE_BOGUS_CHAR_CODEPOINT;
else if ((cp == 0xFFFE) || (cp == 0xFFFF)) /* illegal values. */
cp = UNICODE_BOGUS_CHAR_CODEPOINT;
else
{
/* There are seven "UTF-16 surrogates" that are illegal in UTF-8. */
switch (cp)
{
case 0xD800:
case 0xDB7F:
case 0xDB80:
case 0xDBFF:
case 0xDC00:
case 0xDF80:
case 0xDFFF:
cp = UNICODE_BOGUS_CHAR_CODEPOINT;
} /* switch */
} /* else */
/* Do the encoding... */
if (cp < 0x80)
{
*(dst++) = (char) cp;
len--;
} /* if */
else if (cp < 0x800)
{
if (len < 2)
len = 0;
else
{
*(dst++) = (char) ((cp >> 6) | 128 | 64);
*(dst++) = (char) (cp & 0x3F) | 128;
len -= 2;
} /* else */
} /* else if */
else if (cp < 0x10000)
{
if (len < 3)
len = 0;
else
{
*(dst++) = (char) ((cp >> 12) | 128 | 64 | 32);
*(dst++) = (char) ((cp >> 6) & 0x3F) | 128;
*(dst++) = (char) (cp & 0x3F) | 128;
len -= 3;
} /* else */
} /* else if */
else
{
if (len < 4)
len = 0;
else
{
*(dst++) = (char) ((cp >> 18) | 128 | 64 | 32 | 16);
*(dst++) = (char) ((cp >> 12) & 0x3F) | 128;
*(dst++) = (char) ((cp >> 6) & 0x3F) | 128;
*(dst++) = (char) (cp & 0x3F) | 128;
len -= 4;
} /* else if */
} /* else */
*_dst = dst;
*_len = len;
} /* utf8fromcodepoint */
#define UTF8FROMTYPE(typ, src, dst, len) \
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if (len == 0) return; \
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len--; \
while (len) \
{ \
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const PHYSFS_uint32 cp = (PHYSFS_uint32) ((typ) (*(src++))); \
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if (cp == 0) break; \
utf8fromcodepoint(cp, &dst, &len); \
} \
*dst = '\0'; \
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void PHYSFS_utf8FromUcs4(const PHYSFS_uint32 *src, char *dst, PHYSFS_uint64 len)
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{
UTF8FROMTYPE(PHYSFS_uint32, src, dst, len);
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} /* PHYSFS_utf8FromUcs4 */
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void PHYSFS_utf8FromUcs2(const PHYSFS_uint16 *src, char *dst, PHYSFS_uint64 len)
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{
UTF8FROMTYPE(PHYSFS_uint64, src, dst, len);
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} /* PHYSFS_utf8FromUcs2 */
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/* latin1 maps to unicode codepoints directly, we just utf-8 encode it. */
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void PHYSFS_utf8FromLatin1(const char *src, char *dst, PHYSFS_uint64 len)
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{
UTF8FROMTYPE(PHYSFS_uint8, src, dst, len);
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} /* PHYSFS_utf8FromLatin1 */
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#undef UTF8FROMTYPE
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void PHYSFS_utf8FromUtf16(const PHYSFS_uint16 *src, char *dst, PHYSFS_uint64 len)
{
if (len == 0)
return;
len--;
while (len)
{
PHYSFS_uint32 cp = (PHYSFS_uint32) *(src++);
if (cp == 0)
break;
/* Orphaned second half of surrogate pair? */
if ((cp >= 0xDC00) && (cp <= 0xDFFF))
cp = UNICODE_BOGUS_CHAR_CODEPOINT;
else if ((cp >= 0xD800) && (cp <= 0xDBFF)) /* start surrogate pair! */
{
const PHYSFS_uint32 pair = (PHYSFS_uint32) *src;
if ((pair < 0xDC00) || (pair > 0xDFFF))
cp = UNICODE_BOGUS_CHAR_CODEPOINT;
else
{
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src++; /* eat the other surrogate. */
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cp = (((cp - 0xD800) << 10) | (pair - 0xDC00));
} /* else */
} /* else if */
utf8fromcodepoint(cp, &dst, &len);
} /* while */
*dst = '\0';
} /* PHYSFS_utf8FromUtf16 */
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/* (to) should point to at least 3 PHYSFS_uint32 slots. */
static int locate_casefold_mapping(const PHYSFS_uint32 from, PHYSFS_uint32 *to)
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if (from < 128) /* low-ASCII, easy! */
{
if ((from >= 'A') && (from <= 'Z'))
*to = from - ('A' - 'a');
else
*to = from;
return 1;
} /* if */
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else if (from <= 0xFFFF)
{
const PHYSFS_uint8 hash = ((from ^ (from >> 8)) & 0xFF);
const PHYSFS_uint16 from16 = (PHYSFS_uint16) from;
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{
const CaseFoldHashBucket1_16 *bucket = &case_fold_hash1_16[hash];
const int count = (int) bucket->count;
for (i = 0; i < count; i++)
{
const CaseFoldMapping1_16 *mapping = &bucket->list[i];
if (mapping->from == from16)
{
*to = mapping->to0;
return 1;
} /* if */
} /* for */
}
{
const CaseFoldHashBucket2_16 *bucket = &case_fold_hash2_16[hash & 15];
const int count = (int) bucket->count;
for (i = 0; i < count; i++)
{
const CaseFoldMapping2_16 *mapping = &bucket->list[i];
if (mapping->from == from16)
{
to[0] = mapping->to0;
to[1] = mapping->to1;
return 2;
} /* if */
} /* for */
}
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{
const CaseFoldHashBucket3_16 *bucket = &case_fold_hash3_16[hash & 3];
const int count = (int) bucket->count;
for (i = 0; i < count; i++)
{
const CaseFoldMapping3_16 *mapping = &bucket->list[i];
if (mapping->from == from16)
{
to[0] = mapping->to0;
to[1] = mapping->to1;
to[2] = mapping->to2;
return 3;
} /* if */
} /* for */
}
} /* else if */
else /* codepoint that doesn't fit in 16 bits. */
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const PHYSFS_uint8 hash = ((from ^ (from >> 8)) & 0xFF);
const CaseFoldHashBucket1_32 *bucket = &case_fold_hash1_32[hash & 15];
const int count = (int) bucket->count;
for (i = 0; i < count; i++)
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const CaseFoldMapping1_32 *mapping = &bucket->list[i];
if (mapping->from == from)
{
*to = mapping->to0;
return 1;
} /* if */
} /* for */
} /* else */
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/* Not found...there's no remapping for this codepoint. */
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*to = from;
return 1;
} /* locate_casefold_mapping */
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int PHYSFS_utf8stricmp(const char *str1, const char *str2)
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{
PHYSFS_uint32 folded1[3], folded2[3];
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int head1 = 0;
int tail1 = 0;
int head2 = 0;
int tail2 = 0;
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while (1)
{
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PHYSFS_uint32 cp1, cp2;
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if (head1 != tail1)
cp1 = folded1[tail1++];
else
{
head1 = locate_casefold_mapping(utf8codepoint(&str1), folded1);
cp1 = folded1[0];
tail1 = 1;
} /* else */
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if (head2 != tail2)
cp2 = folded2[tail2++];
else
{
head2 = locate_casefold_mapping(utf8codepoint(&str2), folded2);
cp2 = folded2[0];
tail2 = 1;
} /* else */
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if (cp1 < cp2)
return -1;
else if (cp1 > cp2)
return 1;
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else if (cp1 == 0)
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break; /* complete match. */
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} /* while */
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return 0;
} /* PHYSFS_utf8stricmp */
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/* end of physfs_unicode.c ... */