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physfs/src/physfs_unicode.c

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#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
#include "physfs_casefolding.h"
/*
* From rfc3629, the UTF-8 spec:
* https://www.ietf.org/rfc/rfc3629.txt
*
* 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 __PHYSFS_utf8codepoint() if there's bogus bits in the
* stream. __PHYSFS_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 '?'
PHYSFS_uint32 __PHYSFS_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. */
return octet;
} /* 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 */
{
(*_str)++; /* advance at least one byte in case of an error */
octet -= (128+64);
octet2 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
if ((octet2 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
return UNICODE_BOGUS_CHAR_VALUE;
*_str += 1; /* skip to next possible start of codepoint. */
retval = ((octet << 6) | (octet2 - 128));
if ((retval >= 0x80) && (retval <= 0x7FF))
return retval;
} /* else if */
else if (octet < 240) /* three octets */
{
(*_str)++; /* advance at least one byte in case of an error */
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;
*_str += 2; /* skip to next possible start of codepoint. */
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 */
{
(*_str)++; /* advance at least one byte in case of an error */
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;
*_str += 3; /* skip to next possible start of codepoint. */
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 */
{
(*_str)++; /* advance at least one byte in case of an error */
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 += 4; /* skip to next possible start of codepoint. */
return UNICODE_BOGUS_CHAR_VALUE;
} /* else if */
else /* six octets */
{
(*_str)++; /* advance at least one byte in case of an error */
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;
} /* __PHYSFS_utf8codepoint */
static inline PHYSFS_uint32 utf8codepoint(const char **_str)
{
return __PHYSFS_utf8codepoint(_str);
} /* utf8codepoint */
static PHYSFS_uint32 utf16codepoint(const PHYSFS_uint16 **_str)
{
const PHYSFS_uint16 *src = *_str;
PHYSFS_uint32 cp = (PHYSFS_uint32) *(src++);
if (cp == 0) /* null terminator, end of string. */
return 0;
/* Orphaned second half of surrogate pair? */
else 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 == 0)
cp = UNICODE_BOGUS_CHAR_CODEPOINT;
else if ((pair < 0xDC00) || (pair > 0xDFFF))
cp = UNICODE_BOGUS_CHAR_CODEPOINT;
else
{
src++; /* eat the other surrogate. */
cp = 0x10000 + (((cp - 0xD800) << 10) | (pair - 0xDC00));
} /* else */
} /* else if */
*_str = src;
return cp;
} /* utf16codepoint */
static PHYSFS_uint32 utf32codepoint(const PHYSFS_uint32 **_str)
{
const PHYSFS_uint32 *src = *_str;
PHYSFS_uint32 cp = *(src++);
if (cp == 0) /* null terminator, end of string. */
return 0;
else if (cp > 0x10FFF)
cp = UNICODE_BOGUS_CHAR_CODEPOINT;
*_str = src;
return cp;
} /* utf32codepoint */
void PHYSFS_utf8ToUcs4(const char *src, PHYSFS_uint32 *dst, PHYSFS_uint64 len)
{
len -= sizeof (PHYSFS_uint32); /* save room for null char. */
while (len >= sizeof (PHYSFS_uint32))
{
PHYSFS_uint32 cp = __PHYSFS_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;
} /* PHYSFS_utf8ToUcs4 */
void PHYSFS_utf8ToUcs2(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 = __PHYSFS_utf8codepoint(&src);
if (cp == 0)
break;
else if (cp == UNICODE_BOGUS_CHAR_VALUE)
cp = UNICODE_BOGUS_CHAR_CODEPOINT;
if (cp > 0xFFFF) /* UTF-16 surrogates (bogus chars in UCS-2) */
cp = UNICODE_BOGUS_CHAR_CODEPOINT;
*(dst++) = cp;
len -= sizeof (PHYSFS_uint16);
} /* while */
*dst = 0;
} /* PHYSFS_utf8ToUcs2 */
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 = __PHYSFS_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 */
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) \
if (len == 0) return; \
len--; \
while (len) \
{ \
const PHYSFS_uint32 cp = (PHYSFS_uint32) ((typ) (*(src++))); \
if (cp == 0) break; \
utf8fromcodepoint(cp, &dst, &len); \
} \
*dst = '\0'; \
void PHYSFS_utf8FromUcs4(const PHYSFS_uint32 *src, char *dst, PHYSFS_uint64 len)
{
UTF8FROMTYPE(PHYSFS_uint32, src, dst, len);
} /* PHYSFS_utf8FromUcs4 */
void PHYSFS_utf8FromUcs2(const PHYSFS_uint16 *src, char *dst, PHYSFS_uint64 len)
{
UTF8FROMTYPE(PHYSFS_uint64, src, dst, len);
} /* PHYSFS_utf8FromUcs2 */
/* latin1 maps to unicode codepoints directly, we just utf-8 encode it. */
void PHYSFS_utf8FromLatin1(const char *src, char *dst, PHYSFS_uint64 len)
{
UTF8FROMTYPE(PHYSFS_uint8, src, dst, len);
} /* PHYSFS_utf8FromLatin1 */
#undef UTF8FROMTYPE
void PHYSFS_utf8FromUtf16(const PHYSFS_uint16 *src, char *dst, PHYSFS_uint64 len)
{
if (len == 0)
return;
len--;
while (len)
{
const PHYSFS_uint32 cp = utf16codepoint(&src);
if (!cp)
break;
utf8fromcodepoint(cp, &dst, &len);
} /* while */
*dst = '\0';
} /* PHYSFS_utf8FromUtf16 */
int PHYSFS_caseFold(const PHYSFS_uint32 from, PHYSFS_uint32 *to)
{
int i;
if (from < 128) /* low-ASCII, easy! */
{
if ((from >= 'A') && (from <= 'Z'))
*to = from - ('A' - 'a');
else
*to = from;
return 1;
} /* if */
else if (from <= 0xFFFF)
{
const PHYSFS_uint8 hash = ((from ^ (from >> 8)) & 0xFF);
const PHYSFS_uint16 from16 = (PHYSFS_uint16) from;
{
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 */
}
{
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. */
{
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++)
{
const CaseFoldMapping1_32 *mapping = &bucket->list[i];
if (mapping->from == from)
{
*to = mapping->to0;
return 1;
} /* if */
} /* for */
} /* else */
/* Not found...there's no remapping for this codepoint. */
*to = from;
return 1;
} /* PHYSFS_caseFold */
#define UTFSTRICMP(bits) \
PHYSFS_uint32 folded1[3], folded2[3]; \
int head1 = 0, tail1 = 0, head2 = 0, tail2 = 0; \
while (1) { \
PHYSFS_uint32 cp1, cp2; \
if (head1 != tail1) { \
cp1 = folded1[tail1++]; \
} else { \
head1 = PHYSFS_caseFold(utf##bits##codepoint(&str1), folded1); \
cp1 = folded1[0]; \
tail1 = 1; \
} \
if (head2 != tail2) { \
cp2 = folded2[tail2++]; \
} else { \
head2 = PHYSFS_caseFold(utf##bits##codepoint(&str2), folded2); \
cp2 = folded2[0]; \
tail2 = 1; \
} \
if (cp1 < cp2) { \
return -1; \
} else if (cp1 > cp2) { \
return 1; \
} else if (cp1 == 0) { \
break; /* complete match. */ \
} \
} \
return 0
int PHYSFS_utf8stricmp(const char *str1, const char *str2)
{
UTFSTRICMP(8);
} /* PHYSFS_utf8stricmp */
int PHYSFS_utf16stricmp(const PHYSFS_uint16 *str1, const PHYSFS_uint16 *str2)
{
UTFSTRICMP(16);
} /* PHYSFS_utf16stricmp */
int PHYSFS_ucs4stricmp(const PHYSFS_uint32 *str1, const PHYSFS_uint32 *str2)
{
UTFSTRICMP(32);
} /* PHYSFS_ucs4stricmp */
#undef UTFSTRICMP
/* end of physfs_unicode.c ... */
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