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/*
* VBSF - Unicode conversion routines
* Copyright (C) 2011-2022 Eduardo Casino
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General License for more details.
*
* You should have received a copy of the GNU General License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef UNICODE_H
#define UNICODE_H
#include <stdint.h>
#include "sftsr.h"
#ifdef IN_TSR
#define TSRDATAPTR PTSRDATA
#else
#define TSRDATAPTR LPTSRDATA
#endif
static inline uint8_t lookup_codepage( TSRDATAPTR data, uint16_t cp )
{
uint8_t i;
for ( i = 0; i < 128 && data->unicode_table[i] != cp; ++i );
return ( i < 128 ? (uint8_t) i + 128 : '\0' );
}
// dst and src CAN'T BE THE SAME !!!!
// Returns resulting length or 0 if buffer overflow
//
static uint16_t local_to_utf8_n( TSRDATAPTR data, uint8_t *dst, const char far *src, uint16_t buflen, uint16_t count )
{
uint16_t len = 0; // Resulting length
uint16_t cp; // Unicode Code Point
while ( *src && count )
{
// UTF-8 bytes: 0xxxxxxx
// Binary CP: 0xxxxxxx
// CP range: U+0000 to U+007F (Direct ASCII translation)
//
if ( ! (*src & 0x80) )
{
if ( buflen > len )
{
*dst++ = *src;
++len;
goto cont;
}
else
{
return 0;
}
}
cp = data->unicode_table[*src - 128];
// UTF-8 bytes: 110yyyyy 10xxxxxx
// Binary CP: 00000yyy yyxxxxxx
// CP range: U+0080 to U+07FF
//
if ( ! (cp & 0xF000) )
{
if ( buflen > len + 1 )
{
*dst++ = (uint8_t)( cp >> 6 ) | 0xC0;
*dst++ = (uint8_t)( cp & 0x3f ) | 0x80;
len += 2;
}
else
{
return 0;
}
}
// UTF-8 bytes: 1110zzzz 10yyyyyy 10xxxxxx
// Binary CP: zzzzyyyy yyxxxxxx
// CP range: U+0800 to U+FFFF
//
else
{
if ( buflen > len +2 )
{
*dst++ = (uint8_t)( cp >> 12 ) | 0xE0;
*dst++ = (uint8_t)( (cp >> 6) & 0x3F ) | 0x80;
*dst++ = (uint8_t)( cp & 0x3F ) | 0x80;
len += 3;
}
else
{
return 0;
}
}
cont:
++src, --count;
};
// Terminate string
//
*dst = '\0';
return len;
}
static inline uint16_t local_to_utf8( TSRDATAPTR data, uint8_t *dst, char far *src, uint16_t buflen )
{
return local_to_utf8_n( data, dst, src, buflen, buflen );
}
// Returns true on success, false if any unsupported char is found
//
static bool utf8_to_local( TSRDATAPTR data, char *dst, char *src, uint16_t *len )
{
bool ret = true; // Return code
uint16_t cp; // Unicode Code point
uint16_t l = 0;
while ( *src )
{
// UTF-8 bytes: 0xxxxxxx
// Binary CP: 0xxxxxxx
// CP range: U+0000 to U+007F (Direct ASCII translation)
//
if ( ! (*src & 0x80) )
{
*dst = *src;
++src;
goto cont;
}
// UTF-8 bytes: 110yyyyy 10xxxxxx
// Binary CP: 00000yyy yyxxxxxx
// CP range: U+0080 to U+07FF
//
if ( ! (*src & 0x20) )
{
cp = ( (uint16_t)(*src & 0x1F) << 6 ) | *(src+1) & 0x3F;
*dst = lookup_codepage( data, cp );
if ( *dst == '\0' )
{
*dst = '_';
ret = false;
}
src += 2;
goto cont;
}
// UTF-8 bytes: 1110zzzz 10yyyyyy 10xxxxxx
// Binary CP: zzzzyyyy yyxxxxxx
// CP range: U+0800 to U+FFFF
//
if ( ! (*src & 0x10) )
{
cp = ( (uint16_t)(*src & 0xF) << 12 ) | ( (uint16_t)(*(src+1) & 0x3F) << 6 ) | *(src+2) & 0x3F;
*dst = lookup_codepage( data, cp );
if ( *dst == '\0' )
{
*dst = '_';
ret = false;
}
src += 3;
goto cont;
}
// UTF-8 bytes: 11110www 10zzzzzz 10yyyyyy 10xxxxxx
// Binary CP: 000wwwzz zzzzyyyy yyxxxxxx
// CP range: U+010000 to U+10FFFF
//
if ( ! (*src & 0x08) )
{
*dst = '_'; // Currently unsupported
ret = false;
src += 4;
goto cont;
}
// Should not reach here
//
*dst = '_';
ret = false;
++src;
cont:
++dst, ++l;
};
// Terminate string
//
*dst = '\0';
if (len) *len = l;
return ret;
}
// Returns true on success, false if any unsupported char is found
//
static bool utf16_to_local( TSRDATAPTR data, uint8_t *dst, uint16_t *src, uint16_t len )
{
bool ret = true;
int i;
uint16_t cp;
uint8_t c;
for ( i = 0; i < len; ++i )
{
cp = src[i];
if ( cp < 0x80 )
{
*dst++ = ( uint8_t ) cp;
}
else
{
c = lookup_codepage( data, cp );
if ( c == '\0' )
{
c = '_';
ret = false;
}
*dst++ = c;
}
}
*dst = '\0';
return ret;
}
#endif // UNICODE_H
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