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mulle-utf16.c
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mulle-utf16.c
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//
// mulle_utf16.c
// mulle-utf
//
// Copyright (C) 2011 Nat!, Mulle kybernetiK.
// Copyright (c) 2011 Codeon GmbH.
// All rights reserved.
//
// Coded by Nat!
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// Neither the name of Mulle kybernetiK nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
#include "mulle-utf16.h"
#include "mulle-utf16-string.h"
#include "mulle-utf-noncharacter.h"
#include "mulle-char5.h"
#include "mulle-char7.h"
#include <errno.h>
#include <string.h>
#define FORBID_NON_CHARACTERS 1
int mulle_utf16_is_valid_surrogatepair( mulle_utf16_t hi, mulle_utf16_t lo)
{
// invalid surrogate pairs
//
// D83F DFF*
// D87F DFF*
// D8BF DFF*
// D8FF DFF*
// D93F DFF*
// D97F DFF*
//
// ...
// DBBF DFF*
// DBFF DFF*
// * = E or F
if( lo == 0xDFFE || lo == 0xDFFF)
switch( hi & 0xFF)
{
case 0x3F :
case 0x7F :
case 0xBF :
case 0xFF :
return( 0);
}
return( 1);
}
/*
* copy converters
*/
mulle_utf32_t *_mulle_utf16_convert_to_utf32( mulle_utf16_t *src,
unsigned int len,
mulle_utf32_t *dst)
{
mulle_utf16_t *sentinel;
mulle_utf32_t x;
// if dst_len == -1, then sentinel - 1 = dst_sentinel (OK!)
assert( len != (unsigned int) -1);
sentinel = &src[ len];
while( src < sentinel)
{
x = *src++;
if( mulle_utf32_is_highsurrogatecharacter( x)) // hi surrogate
{
// decode surrogate
assert( src < sentinel);
x = mulle_utf16_decode_surrogatepair( (mulle_utf16_t) x, *src++);
}
*dst++ = x;
}
return( dst);
}
//
// this also does not do any error checking,
// must be proper UTF16 code!
char *_mulle_utf16_convert_to_utf8( mulle_utf16_t *src, unsigned int len, char *_dst)
{
unsigned char *dst = (unsigned char *) _dst;
mulle_utf16_t *sentinel;
mulle_utf32_t x;
// if dst_len == -1, then sentinel - 1 = dst_sentinel (OK!)
assert( len != (unsigned int) -1);
sentinel = &src[ len];
while( src < sentinel)
{
x = *src++;
assert( x >= 0 && x <= mulle_utf32_max);
// 4 cases
// < 0x80, < 0x800 < 0x10000, > 0x10000
recheck:
if( x < 0x80)
{
*dst++ = (unsigned char) x;
continue;
}
if( x < 0x800)
{
*dst++ = 0xC0 | (unsigned char) (x >> 6);
*dst++ = 0x80 | (x & 0x3F);
continue;
}
if( x < 0x10000)
{
if( mulle_utf32_is_highsurrogatecharacter( x)) // hi surrogate
{
// decode surrogate
assert( src < sentinel);
x = mulle_utf16_decode_surrogatepair( (mulle_utf16_t) x, *src++);
goto recheck;
}
assert( ! mulle_utf32_is_lowsurrogatecharacter( x));
*dst++ = 0xE0 | (unsigned char) (x >> 12);
*dst++ = 0x80 | ((x >> 6) & 0x3F);
*dst++ = 0x80 | (x & 0x3F);
continue;
}
assert( x <= 0x10FFFF);
*dst++ = 0xF0 | (unsigned char) (x >> 18);
*dst++ = 0x80 | ((x >> 12) & 0x3F);
*dst++ = 0x80 | ((x >> 6) & 0x3F);
*dst++ = 0x80 | (x & 0x3F);
}
return( (char *) dst);
}
/*
* buffer converters
*/
//
// this also does not do any error checking,
// must be proper UTF16 code!
void mulle_utf16_bufferconvert_to_utf8( mulle_utf16_t *src,
unsigned int len,
void *buffer,
mulle_utf_add_bytes_function_t *addbytes)
{
mulle_utf16_t *sentinel;
mulle_utf32_t x;
unsigned char *s;
unsigned char *s_flush;
unsigned char tmp[ 128];
if( len == (unsigned int) -1)
len = mulle_utf16_strlen( src);
// if dst_len == -1, then sentinel - 1 = dst_sentinel (OK!)
sentinel = &src[ len];
s = tmp;
s_flush = &tmp[ sizeof( tmp) / sizeof( unsigned char) - 4];
while( src < sentinel)
{
if( s >= s_flush)
{
(*addbytes)( buffer, tmp, s - tmp);
s = tmp;
}
x = *src++;
recheck:
assert( x >= 0 && x <= mulle_utf32_max);
if( x < 0x80)
{
*s++ = (unsigned char) x;
continue;
}
if( x < 0x800)
{
*s++ = 0xC0 | (unsigned char) (x >> 6);
*s++ = 0x80 | (x & 0x3F);
continue;
}
// 4 cases
// < 0x80, < 0x800 < 0x10000, > 0x10000
if( x < 0x10000)
{
//TODO: can't this be done later
if( mulle_utf32_is_highsurrogatecharacter( x)) // hi surrogate
{
// decode surrogate
assert( src < sentinel);
x = mulle_utf16_decode_surrogatepair( (mulle_utf16_t) x, *src++);
goto recheck;
}
assert( ! mulle_utf32_is_lowsurrogatecharacter( x));
*s++ = 0xE0 | (unsigned char) (x >> 12);
*s++ = 0x80 | ((x >> 6) & 0x3F);
*s++ = 0x80 | (x & 0x3F);
continue;
}
assert( x <= 0x10FFFF);
*s++ = 0xF0 | (unsigned char) (x >> 18);
*s++ = 0x80 | ((x >> 12) & 0x3F);
*s++ = 0x80 | ((x >> 6) & 0x3F);
*s++ = 0x80 | (x & 0x3F);
}
if( s != tmp)
(*addbytes)( buffer, tmp, s - tmp);
}
void mulle_utf16_bufferconvert_to_utf32( mulle_utf16_t *src,
unsigned int len,
void *buffer,
mulle_utf_add_bytes_function_t *addbytes)
{
mulle_utf16_t *sentinel;
mulle_utf32_t x;
mulle_utf32_t *s;
mulle_utf32_t *s_flush;
mulle_utf32_t tmp[ 32];
if( len == (unsigned int) -1)
len = mulle_utf16_strlen( src);
// if dst_len == -1, then sentinel - 1 = dst_sentinel (OK!)
sentinel = &src[ len];
s = tmp;
s_flush = &tmp[ sizeof( tmp) / sizeof( mulle_utf32_t)]; // post-flush!
while( src < sentinel)
{
x = *src++;
if( mulle_utf32_is_highsurrogatecharacter( x)) // hi surrogate
{
// decode surrogate
assert( src < sentinel);
x = mulle_utf16_decode_surrogatepair( (mulle_utf16_t) x, *src++);
}
*s++ = x;
if( s == s_flush)
{
(*addbytes)( buffer, tmp, sizeof( tmp));
s = tmp;
}
}
if( s != tmp)
(*addbytes)( buffer, tmp, (s - tmp) * sizeof( mulle_utf32_t));
}
static inline int mulle_utf16_is_invalid_char( mulle_utf16_t c)
{
return( c >= 0xFFFE || (c >= 0xFDD0 && c <= 0xFDEF));
}
//
// just checks that the surrogate pairs are ok
//
mulle_utf16_t *mulle_utf16_validate( mulle_utf16_t *src, unsigned int len)
{
mulle_utf16_t c;
mulle_utf16_t d;
mulle_utf16_t *sentinel;
if( ! src)
return( NULL);
if( len == (unsigned int) -1)
len = mulle_utf16_strlen( src);
sentinel = &src[ len];
for( ; src < sentinel; src++)
{
c = *src;
if( ! c)
return( src);
if( mulle_utf16_is_invalid_char( c))
return( src);
if( ! mulle_utf32_is_surrogatecharacter( c))
continue;
if( mulle_utf32_is_lowsurrogatecharacter( c))
return( src);
if( src >= sentinel)
return( src);
d = *++src;
if( ! mulle_utf32_is_lowsurrogatecharacter( d))
return( src);
if( ! mulle_utf16_is_valid_surrogatepair( c, d))
return( src - 1);
if( mulle_utf16_decode_surrogatepair( c, d) > mulle_utf32_max)
return( src -1);
}
return( 0);
}
//
// this routine does not validate...
//
size_t mulle_utf16_utf8length( mulle_utf16_t *src, unsigned int len)
{
mulle_utf16_t c;
mulle_utf16_t *sentinel;
size_t size;
if( len == (unsigned int) -1)
len = mulle_utf16_strlen( src);
if( ! len)
return( 0);
sentinel = &src[ len];
size = (size_t) len;
for( ; src < sentinel;)
{
c = *src++;
if( c < 0x80)
continue;
if( c < 0x0800)
{
size++;
continue;
}
// not a surrogate pair ?
if( ! mulle_utf32_is_surrogatecharacter( c))
{
size += 2;
continue;
}
if( ++src > sentinel)
return( -1);
size += -1 + 3;
}
return( size);
}
unsigned int mulle_utf16_utf32length( mulle_utf16_t *src, unsigned int len)
{
mulle_utf16_t c;
mulle_utf16_t *sentinel;
if( len == (unsigned int) -1)
len = mulle_utf16_strlen( src);
if( ! len)
return( 0);
sentinel = &src[ len];
for( ; src < sentinel;)
{
c = *src++;
if( ! mulle_utf32_is_highsurrogatecharacter( c))
continue;
if( src >= sentinel)
return( -1);
c = *src++;
assert( mulle_utf32_is_lowsurrogatecharacter( c));
--len;
}
return( len);
}
unsigned int mulle_utf16_length( mulle_utf16_t *src, unsigned int len)
{
mulle_utf16_t c;
mulle_utf16_t *sentinel;
unsigned int dst_len;
if( len == (unsigned int) -1)
len = mulle_utf16_strlen( src);
sentinel = &src[ len];
dst_len = len;
for( ; src < sentinel;)
{
c = *src++;
if( c < 0x0800)
continue;
// not a surrogate pair ?
if( ! mulle_utf32_is_surrogatecharacter( c))
{
dst_len--;
continue;
}
if( ++src > sentinel)
return( -1);
dst_len -= 2;
}
return( dst_len);
}
mulle_utf32_t _mulle_utf16_next_utf32character( mulle_utf16_t **s_p)
{
mulle_utf16_t *s;
mulle_utf32_t value;
s = *s_p;
value = *s++;
assert( value >= 0 && value <= mulle_utf32_max);
if( mulle_utf32_is_surrogatecharacter( value))
value = mulle_utf16_decode_surrogatepair( (mulle_utf16_t) value, *s++);
*s_p = s;
return( value);
}
// sorta undoes _mulle_utf8_next_utf32_value
mulle_utf32_t _mulle_utf16_previous_utf32character( mulle_utf16_t **s_p)
{
mulle_utf16_t *s;
mulle_utf32_t value;
s = *s_p;
value = *--s;
assert( value >= 0 && value <= mulle_utf32_max);
if( mulle_utf32_is_surrogatecharacter( value))
value = mulle_utf16_decode_surrogatepair( *--s, (mulle_utf16_t) value);
*s_p = s;
return( value);
}
//
// make it more optimal, by (a) checking that pointer can be accessed with
// a long or long long
// (b) masking value with 0x80808080 to figure out if all are "ASCII"
//
int mulle_utf16_information( mulle_utf16_t *src, unsigned int len, struct mulle_utf_information *info)
{
mulle_utf16_t _c;
mulle_utf16_t *start;
mulle_utf16_t *sentinel;
struct mulle_utf_information dummy;
if( ! info)
info = &dummy;
info->has_terminating_zero = 0;
info->invalid = NULL;
info->start = src;
info->is_ascii = 1;
info->is_char5 = 1;
info->is_utf15 = 1;
info->utf8len = 0;
info->utf16len = 0;
info->utf32len = 0;
info->has_bom = 0;
if( ! len)
return( 0);
if( ! src)
goto fail;
if( len == (unsigned int) -1)
len = mulle_utf16_strlen( src);
//
// remove leading BOM
//
info->has_bom = mulle_utf32_is_bomcharacter( *src);
if( info->has_bom)
{
src += 1;
len -= 1;
}
info->start = src;
start = src;
sentinel = &src[ len];
for( ; src < sentinel; src++)
{
if( ! (_c = *src))
{
info->has_terminating_zero = 1;
break;
}
if( mulle_utf16_is_asciicharacter( _c))
{
if( info->is_char5 && ! mulle_utf16_is_char5character( _c))
info->is_char5 = 0;
continue;
}
info->is_ascii = 0;
info->utf8len++;
if( _c >= 0x0800)
info->utf8len++;
if( _c >= 0x8000)
info->is_utf15 = 0;
// surrogate pair
if( _c >= 0xD800 && _c <= 0xE000)
{
if( ! mulle_utf32_is_highsurrogatecharacter( _c))
goto fail;
info->utf8len++;
info->utf32len--;
if( ++src >= sentinel)
goto fail;
_c = *src;
if( ! mulle_utf32_is_lowsurrogatecharacter( _c))
goto fail;
}
#if FORBID_NON_CHARACTERS
if( mulle_utf16_is_invalid_char( _c))
goto fail;
#endif
}
info->utf8len += src - start;
info->utf16len += src - start;
info->utf32len += src - start;
info->is_char5 &= info->is_ascii;
return( 0);
fail:
memset( info, 0, sizeof( *info));
info->invalid = src;
return( -1);
}
int mulle_utf16_contains_character_larger_or_equal( mulle_utf16_t *s,
unsigned int len,
mulle_utf16_t d)
{
mulle_utf16_t _c;
mulle_utf16_t *sentinel;
mulle_utf16_t *p;
if( len == (unsigned int) -1)
len = mulle_utf16_strlen( s);
p = s;
sentinel = &p[ len];
while( p < sentinel)
{
_c = *p++;
if( _c >= d)
return( 1);
}
return( 0);
}
//
// src must be known to be UTF15, and contain no zeroes
//
enum mulle_utf_charinfo _mulle_utf16_charinfo( mulle_utf16_t *src, unsigned int len)
{
mulle_utf16_t _c;
mulle_utf16_t *start;
mulle_utf16_t *sentinel;
assert( len);
if( len > mulle_char5_get_maxlength())
return( mulle_utf_is_not_char5_or_char7);
start = src;
sentinel = &start[ len];
if( len <= mulle_char7_get_maxlength())
{
for( ; src < sentinel; src++)
{
_c = *src;
if( ! mulle_utf16_is_asciicharacter( _c))
return( mulle_utf_is_not_char5_or_char7);
}
return( mulle_utf_is_char7);
}
for( ; src < sentinel; src++)
{
_c = *src;
if( ! mulle_utf16_is_char5character( _c))
return( mulle_utf_is_not_char5_or_char7);
}
return( mulle_utf_is_char5);
}