573 lines
17 KiB
C
573 lines
17 KiB
C
#define __PHYSICSFS_INTERNAL__
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#include "physfs_internal.h"
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#include "physfs_casefolding.h"
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/*
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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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*
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* Char. number range | UTF-8 octet sequence
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* (hexadecimal) | (binary)
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* --------------------+---------------------------------------------
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* 0000 0000-0000 007F | 0xxxxxxx
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* 0000 0080-0000 07FF | 110xxxxx 10xxxxxx
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* 0000 0800-0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx
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* 0001 0000-0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
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*/
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/*
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* This may not be the best value, but it's one that isn't represented
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* in Unicode (0x10FFFF is the largest codepoint value). We return this
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* value from __PHYSFS_utf8codepoint() if there's bogus bits in the
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* stream. __PHYSFS_utf8codepoint() will turn this value into something
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* reasonable (like a question mark), for text that wants to try to recover,
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* whereas utf8valid() will use the value to determine if a string has bad
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* bits.
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*/
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#define UNICODE_BOGUS_CHAR_VALUE 0xFFFFFFFF
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/*
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* This is the codepoint we currently return when there was bogus bits in a
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* UTF-8 string. May not fly in Asian locales?
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*/
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#define UNICODE_BOGUS_CHAR_CODEPOINT '?'
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PHYSFS_uint32 __PHYSFS_utf8codepoint(const char **_str)
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{
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const char *str = *_str;
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PHYSFS_uint32 retval = 0;
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PHYSFS_uint32 octet = (PHYSFS_uint32) ((PHYSFS_uint8) *str);
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PHYSFS_uint32 octet2, octet3, octet4;
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if (octet == 0) /* null terminator, end of string. */
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return 0;
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else if (octet < 128) /* one octet char: 0 to 127 */
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{
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(*_str)++; /* skip to next possible start of codepoint. */
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return octet;
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} /* else if */
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else if ((octet > 127) && (octet < 192)) /* bad (starts with 10xxxxxx). */
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{
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/*
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* Apparently each of these is supposed to be flagged as a bogus
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* char, instead of just resyncing to the next valid codepoint.
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*/
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(*_str)++; /* skip to next possible start of codepoint. */
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return UNICODE_BOGUS_CHAR_VALUE;
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} /* else if */
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else if (octet < 224) /* two octets */
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{
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(*_str)++; /* advance at least one byte in case of an error */
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octet -= (128+64);
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octet2 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
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if ((octet2 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
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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));
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if ((retval >= 0x80) && (retval <= 0x7FF))
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return retval;
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} /* else if */
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else if (octet < 240) /* three octets */
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{
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(*_str)++; /* advance at least one byte in case of an error */
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octet -= (128+64+32);
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octet2 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
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if ((octet2 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
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return UNICODE_BOGUS_CHAR_VALUE;
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octet3 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
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if ((octet3 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
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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)) );
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/* There are seven "UTF-16 surrogates" that are illegal in UTF-8. */
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switch (retval)
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{
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case 0xD800:
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case 0xDB7F:
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case 0xDB80:
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case 0xDBFF:
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case 0xDC00:
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case 0xDF80:
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case 0xDFFF:
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return UNICODE_BOGUS_CHAR_VALUE;
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} /* switch */
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/* 0xFFFE and 0xFFFF are illegal, too, so we check them at the edge. */
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if ((retval >= 0x800) && (retval <= 0xFFFD))
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return retval;
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} /* else if */
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else if (octet < 248) /* four octets */
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{
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(*_str)++; /* advance at least one byte in case of an error */
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octet -= (128+64+32+16);
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octet2 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
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if ((octet2 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
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return UNICODE_BOGUS_CHAR_VALUE;
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octet3 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
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if ((octet3 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
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return UNICODE_BOGUS_CHAR_VALUE;
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octet4 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
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if ((octet4 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
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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) |
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((octet3 - 128) << 6) | ((octet4 - 128)) );
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if ((retval >= 0x10000) && (retval <= 0x10FFFF))
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return retval;
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} /* else if */
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/*
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* Five and six octet sequences became illegal in rfc3629.
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* We throw the codepoint away, but parse them to make sure we move
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* ahead the right number of bytes and don't overflow the buffer.
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*/
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else if (octet < 252) /* five octets */
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{
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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));
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if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
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return UNICODE_BOGUS_CHAR_VALUE;
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octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
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if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
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return UNICODE_BOGUS_CHAR_VALUE;
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octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
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if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
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return UNICODE_BOGUS_CHAR_VALUE;
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octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
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if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
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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;
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} /* else if */
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else /* six octets */
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{
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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));
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if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
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return UNICODE_BOGUS_CHAR_VALUE;
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octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
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if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
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return UNICODE_BOGUS_CHAR_VALUE;
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octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
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if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
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return UNICODE_BOGUS_CHAR_VALUE;
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octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
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if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
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return UNICODE_BOGUS_CHAR_VALUE;
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octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
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if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
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return UNICODE_BOGUS_CHAR_VALUE;
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*_str += 6; /* skip to next possible start of codepoint. */
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return UNICODE_BOGUS_CHAR_VALUE;
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} /* else if */
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return UNICODE_BOGUS_CHAR_VALUE;
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} /* __PHYSFS_utf8codepoint */
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static inline PHYSFS_uint32 utf8codepoint(const char **_str)
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{
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return __PHYSFS_utf8codepoint(_str);
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} /* utf8codepoint */
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static PHYSFS_uint32 utf16codepoint(const PHYSFS_uint16 **_str)
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{
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const PHYSFS_uint16 *src = *_str;
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PHYSFS_uint32 cp = (PHYSFS_uint32) *(src++);
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if (cp == 0) /* null terminator, end of string. */
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return 0;
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/* Orphaned second half of surrogate pair? */
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else if ((cp >= 0xDC00) && (cp <= 0xDFFF))
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cp = UNICODE_BOGUS_CHAR_CODEPOINT;
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else if ((cp >= 0xD800) && (cp <= 0xDBFF)) /* start surrogate pair! */
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{
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const PHYSFS_uint32 pair = (PHYSFS_uint32) *src;
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if (pair == 0)
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cp = UNICODE_BOGUS_CHAR_CODEPOINT;
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else if ((pair < 0xDC00) || (pair > 0xDFFF))
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cp = UNICODE_BOGUS_CHAR_CODEPOINT;
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else
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{
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src++; /* eat the other surrogate. */
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cp = 0x10000 + (((cp - 0xD800) << 10) | (pair - 0xDC00));
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} /* else */
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} /* else if */
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*_str = src;
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return cp;
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} /* utf16codepoint */
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static PHYSFS_uint32 utf32codepoint(const PHYSFS_uint32 **_str)
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{
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const PHYSFS_uint32 *src = *_str;
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PHYSFS_uint32 cp = *(src++);
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if (cp == 0) /* null terminator, end of string. */
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return 0;
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else if (cp > 0x10FFF)
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cp = UNICODE_BOGUS_CHAR_CODEPOINT;
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*_str = src;
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return cp;
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} /* utf32codepoint */
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void PHYSFS_utf8ToUcs4(const char *src, PHYSFS_uint32 *dst, PHYSFS_uint64 len)
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{
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len -= sizeof (PHYSFS_uint32); /* save room for null char. */
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while (len >= sizeof (PHYSFS_uint32))
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{
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PHYSFS_uint32 cp = __PHYSFS_utf8codepoint(&src);
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if (cp == 0)
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break;
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else if (cp == UNICODE_BOGUS_CHAR_VALUE)
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cp = UNICODE_BOGUS_CHAR_CODEPOINT;
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*(dst++) = cp;
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len -= sizeof (PHYSFS_uint32);
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} /* while */
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*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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{
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len -= sizeof (PHYSFS_uint16); /* save room for null char. */
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while (len >= sizeof (PHYSFS_uint16))
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{
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PHYSFS_uint32 cp = __PHYSFS_utf8codepoint(&src);
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if (cp == 0)
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break;
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else if (cp == UNICODE_BOGUS_CHAR_VALUE)
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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;
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*(dst++) = cp;
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len -= sizeof (PHYSFS_uint16);
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} /* while */
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*dst = 0;
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} /* PHYSFS_utf8ToUcs2 */
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void PHYSFS_utf8ToUtf16(const char *src, PHYSFS_uint16 *dst, PHYSFS_uint64 len)
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{
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len -= sizeof (PHYSFS_uint16); /* save room for null char. */
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while (len >= sizeof (PHYSFS_uint16))
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{
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PHYSFS_uint32 cp = __PHYSFS_utf8codepoint(&src);
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if (cp == 0)
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break;
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else if (cp == UNICODE_BOGUS_CHAR_VALUE)
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cp = UNICODE_BOGUS_CHAR_CODEPOINT;
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if (cp > 0xFFFF) /* encode as surrogate pair */
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{
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if (len < (sizeof (PHYSFS_uint16) * 2))
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break; /* not enough room for the pair, stop now. */
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cp -= 0x10000; /* Make this a 20-bit value */
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*(dst++) = 0xD800 + ((cp >> 10) & 0x3FF);
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len -= sizeof (PHYSFS_uint16);
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cp = 0xDC00 + (cp & 0x3FF);
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} /* if */
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*(dst++) = cp;
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len -= sizeof (PHYSFS_uint16);
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} /* while */
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*dst = 0;
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} /* PHYSFS_utf8ToUtf16 */
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static void utf8fromcodepoint(PHYSFS_uint32 cp, char **_dst, PHYSFS_uint64 *_len)
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{
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char *dst = *_dst;
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PHYSFS_uint64 len = *_len;
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if (len == 0)
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return;
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if (cp > 0x10FFFF)
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cp = UNICODE_BOGUS_CHAR_CODEPOINT;
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else if ((cp == 0xFFFE) || (cp == 0xFFFF)) /* illegal values. */
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cp = UNICODE_BOGUS_CHAR_CODEPOINT;
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else
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{
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/* There are seven "UTF-16 surrogates" that are illegal in UTF-8. */
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switch (cp)
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{
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case 0xD800:
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case 0xDB7F:
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case 0xDB80:
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case 0xDBFF:
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case 0xDC00:
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case 0xDF80:
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case 0xDFFF:
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cp = UNICODE_BOGUS_CHAR_CODEPOINT;
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} /* switch */
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} /* else */
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/* Do the encoding... */
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if (cp < 0x80)
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{
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*(dst++) = (char) cp;
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len--;
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} /* if */
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else if (cp < 0x800)
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{
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if (len < 2)
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len = 0;
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else
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{
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*(dst++) = (char) ((cp >> 6) | 128 | 64);
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*(dst++) = (char) (cp & 0x3F) | 128;
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len -= 2;
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} /* else */
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} /* else if */
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else if (cp < 0x10000)
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{
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if (len < 3)
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len = 0;
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else
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{
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*(dst++) = (char) ((cp >> 12) | 128 | 64 | 32);
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*(dst++) = (char) ((cp >> 6) & 0x3F) | 128;
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*(dst++) = (char) (cp & 0x3F) | 128;
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len -= 3;
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} /* else */
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} /* else if */
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else
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{
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if (len < 4)
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len = 0;
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else
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{
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*(dst++) = (char) ((cp >> 18) | 128 | 64 | 32 | 16);
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*(dst++) = (char) ((cp >> 12) & 0x3F) | 128;
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*(dst++) = (char) ((cp >> 6) & 0x3F) | 128;
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*(dst++) = (char) (cp & 0x3F) | 128;
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len -= 4;
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} /* else if */
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} /* else */
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*_dst = dst;
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*_len = len;
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} /* utf8fromcodepoint */
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#define UTF8FROMTYPE(typ, src, dst, len) \
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if (len == 0) return; \
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len--; \
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while (len) \
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{ \
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const PHYSFS_uint32 cp = (PHYSFS_uint32) ((typ) (*(src++))); \
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if (cp == 0) break; \
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utf8fromcodepoint(cp, &dst, &len); \
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} \
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*dst = '\0'; \
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void PHYSFS_utf8FromUcs4(const PHYSFS_uint32 *src, char *dst, PHYSFS_uint64 len)
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{
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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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{
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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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{
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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)
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{
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if (len == 0)
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return;
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len--;
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while (len)
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{
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const PHYSFS_uint32 cp = utf16codepoint(&src);
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if (!cp)
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break;
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utf8fromcodepoint(cp, &dst, &len);
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} /* while */
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*dst = '\0';
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} /* PHYSFS_utf8FromUtf16 */
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int PHYSFS_caseFold(const PHYSFS_uint32 from, PHYSFS_uint32 *to)
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{
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int i;
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if (from < 128) /* low-ASCII, easy! */
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{
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if ((from >= 'A') && (from <= 'Z'))
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*to = from - ('A' - 'a');
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else
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*to = from;
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return 1;
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} /* if */
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else if (from <= 0xFFFF)
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{
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const PHYSFS_uint8 hash = ((from ^ (from >> 8)) & 0xFF);
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const PHYSFS_uint16 from16 = (PHYSFS_uint16) from;
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{
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const CaseFoldHashBucket1_16 *bucket = &case_fold_hash1_16[hash];
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const int count = (int) bucket->count;
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for (i = 0; i < count; i++)
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{
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const CaseFoldMapping1_16 *mapping = &bucket->list[i];
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if (mapping->from == from16)
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{
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*to = mapping->to0;
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return 1;
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} /* if */
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} /* for */
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}
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{
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const CaseFoldHashBucket2_16 *bucket = &case_fold_hash2_16[hash & 15];
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const int count = (int) bucket->count;
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for (i = 0; i < count; i++)
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{
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const CaseFoldMapping2_16 *mapping = &bucket->list[i];
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if (mapping->from == from16)
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{
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to[0] = mapping->to0;
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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 ... */
|
|
|