mirror of
https://github.com/minetest/irrlicht.git
synced 2024-11-05 01:40:44 +01:00
98aed6ba67
Tiny speed hit, but old solution caused warnings. And it was not very safe by assuming all non _WIN32 platforms would use 32 bit sizes for wchar_t. git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6290 dfc29bdd-3216-0410-991c-e03cc46cb475
380 lines
10 KiB
C++
380 lines
10 KiB
C++
// Copyright (C) 2014 Lauri Kasanen
|
|
// This file is part of the "Irrlicht Engine". The UTF-8 functions are from physfs,
|
|
// under the zlib license, reproduced below.
|
|
|
|
#include "irrTypes.h"
|
|
#include "irrString.h"
|
|
|
|
namespace irr
|
|
{
|
|
namespace core
|
|
{
|
|
|
|
/*
|
|
Copyright (c) 2001-2011 Ryan C. Gordon and others.
|
|
|
|
This software is provided 'as-is', without any express or implied warranty.
|
|
In no event will the authors be held liable for any damages arising from
|
|
the use of this software.
|
|
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute it
|
|
freely, subject to the following restrictions:
|
|
|
|
1. The origin of this software must not be misrepresented; you must not
|
|
claim that you wrote the original software. If you use this software in a
|
|
product, an acknowledgment in the product documentation would be
|
|
appreciated but is not required.
|
|
|
|
2. Altered source versions must be plainly marked as such, and must not be
|
|
misrepresented as being the original software.
|
|
|
|
3. This notice may not be removed or altered from any source distribution.
|
|
|
|
Ryan C. Gordon <icculus@icculus.org>
|
|
*/
|
|
|
|
/*
|
|
* From rfc3629, the UTF-8 spec:
|
|
* http://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 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 u32 utf8codepoint(const char **_str)
|
|
{
|
|
const char *str = *_str;
|
|
u32 retval = 0;
|
|
u32 octet = (u32) ((u8) *str);
|
|
u32 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 */
|
|
{
|
|
octet -= (128+64);
|
|
octet2 = (u32) ((u8) *(++str));
|
|
if ((octet2 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
|
|
return UNICODE_BOGUS_CHAR_VALUE;
|
|
|
|
*_str += 2; /* 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 */
|
|
{
|
|
octet -= (128+64+32);
|
|
octet2 = (u32) ((u8) *(++str));
|
|
if ((octet2 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
|
|
return UNICODE_BOGUS_CHAR_VALUE;
|
|
|
|
octet3 = (u32) ((u8) *(++str));
|
|
if ((octet3 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
|
|
return UNICODE_BOGUS_CHAR_VALUE;
|
|
|
|
*_str += 3; /* 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 */
|
|
{
|
|
octet -= (128+64+32+16);
|
|
octet2 = (u32) ((u8) *(++str));
|
|
if ((octet2 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
|
|
return UNICODE_BOGUS_CHAR_VALUE;
|
|
|
|
octet3 = (u32) ((u8) *(++str));
|
|
if ((octet3 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
|
|
return UNICODE_BOGUS_CHAR_VALUE;
|
|
|
|
octet4 = (u32) ((u8) *(++str));
|
|
if ((octet4 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
|
|
return UNICODE_BOGUS_CHAR_VALUE;
|
|
|
|
*_str += 4; /* 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 */
|
|
{
|
|
octet = (u32) ((u8) *(++str));
|
|
if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
|
|
return UNICODE_BOGUS_CHAR_VALUE;
|
|
|
|
octet = (u32) ((u8) *(++str));
|
|
if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
|
|
return UNICODE_BOGUS_CHAR_VALUE;
|
|
|
|
octet = (u32) ((u8) *(++str));
|
|
if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
|
|
return UNICODE_BOGUS_CHAR_VALUE;
|
|
|
|
octet = (u32) ((u8) *(++str));
|
|
if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
|
|
return UNICODE_BOGUS_CHAR_VALUE;
|
|
|
|
*_str += 5; /* skip to next possible start of codepoint. */
|
|
return UNICODE_BOGUS_CHAR_VALUE;
|
|
} /* else if */
|
|
|
|
else /* six octets */
|
|
{
|
|
octet = (u32) ((u8) *(++str));
|
|
if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
|
|
return UNICODE_BOGUS_CHAR_VALUE;
|
|
|
|
octet = (u32) ((u8) *(++str));
|
|
if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
|
|
return UNICODE_BOGUS_CHAR_VALUE;
|
|
|
|
octet = (u32) ((u8) *(++str));
|
|
if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
|
|
return UNICODE_BOGUS_CHAR_VALUE;
|
|
|
|
octet = (u32) ((u8) *(++str));
|
|
if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
|
|
return UNICODE_BOGUS_CHAR_VALUE;
|
|
|
|
octet = (u32) ((u8) *(++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 */
|
|
|
|
|
|
static void PHYSFS_utf8ToUcs4(const char *src, u32 *dst, u64 len)
|
|
{
|
|
len -= sizeof (u32); /* save room for null char. */
|
|
while (len >= sizeof (u32))
|
|
{
|
|
u32 cp = utf8codepoint(&src);
|
|
if (cp == 0)
|
|
break;
|
|
else if (cp == UNICODE_BOGUS_CHAR_VALUE)
|
|
cp = UNICODE_BOGUS_CHAR_CODEPOINT;
|
|
*(dst++) = cp;
|
|
len -= sizeof (u32);
|
|
} /* while */
|
|
|
|
*dst = 0;
|
|
} /* PHYSFS_utf8ToUcs4 */
|
|
|
|
|
|
static void PHYSFS_utf8ToUcs2(const char *src, u16 *dst, u64 len)
|
|
{
|
|
len -= sizeof (u16); /* save room for null char. */
|
|
while (len >= sizeof (u16))
|
|
{
|
|
u32 cp = utf8codepoint(&src);
|
|
if (cp == 0)
|
|
break;
|
|
else if (cp == UNICODE_BOGUS_CHAR_VALUE)
|
|
cp = UNICODE_BOGUS_CHAR_CODEPOINT;
|
|
|
|
/* !!! BLUESKY: UTF-16 surrogates? */
|
|
if (cp > 0xFFFF)
|
|
cp = UNICODE_BOGUS_CHAR_CODEPOINT;
|
|
|
|
*(dst++) = cp;
|
|
len -= sizeof (u16);
|
|
} /* while */
|
|
|
|
*dst = 0;
|
|
} /* PHYSFS_utf8ToUcs2 */
|
|
|
|
static void utf8fromcodepoint(u32 cp, char **_dst, u64 *_len)
|
|
{
|
|
char *dst = *_dst;
|
|
u64 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 u32 cp = (u32) ((typ) (*(src++))); \
|
|
if (cp == 0) break; \
|
|
utf8fromcodepoint(cp, &dst, &len); \
|
|
} \
|
|
*dst = '\0'; \
|
|
|
|
static void PHYSFS_utf8FromUcs4(const u32 *src, char *dst, u64 len)
|
|
{
|
|
UTF8FROMTYPE(u32, src, dst, len);
|
|
} /* PHYSFS_utf8FromUcs4 */
|
|
|
|
static void PHYSFS_utf8FromUcs2(const u16 *src, char *dst, u64 len)
|
|
{
|
|
UTF8FROMTYPE(u64, src, dst, len);
|
|
} /* PHYSFS_utf8FromUcs4 */
|
|
|
|
#undef UTF8FROMTYPE
|
|
|
|
void utf8ToWchar(const char *in, wchar_t *out, const u64 len)
|
|
{
|
|
switch ( sizeof(wchar_t) )
|
|
{
|
|
case 2: PHYSFS_utf8ToUcs2(in, (u16 *) out, len); break;
|
|
case 4: PHYSFS_utf8ToUcs4(in, (u32 *) out, len); break;
|
|
}
|
|
}
|
|
|
|
void wcharToUtf8(const wchar_t *in, char *out, const u64 len)
|
|
{
|
|
switch ( sizeof(wchar_t) )
|
|
{
|
|
case 2: PHYSFS_utf8FromUcs2((const u16 *) in, out, len); break;
|
|
case 4: PHYSFS_utf8FromUcs4((const u32 *) in, out, len); break;
|
|
}
|
|
}
|
|
|
|
} // end namespace core
|
|
} // end namespace irr
|