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/*
* SPL - The SPL Programming Language
* Copyright (C) 2004, 2005 Clifford Wolf <clifford@clifford.at>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public 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 Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* utf8.c: Simple utf8 conversion and check functions
*/
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include "spl.h"
#include "utf8tab.h"
typedef unsigned char charset_map_table_type[4];
static struct {
charset_map_table_type *table;
char *name;
} charset_map[] = {
{ UTF8TAB_ISO8859_1, "ascii" },
{ UTF8TAB_ISO8859_1, "latin_1" },
{ UTF8TAB_ISO8859_1, "iso8859_1" },
{ 0, 0 }
};
const char *spl_utf8_check(const char *text)
{
const unsigned char *utext = (const unsigned char *)text;
int inc = 0;
for (const unsigned char *t = utext; *t; t += inc + 1)
{
#define IN(off, mask, value) ((t[inc=off] & (mask)) == (value))
if (IN(0, 0x80, 0x00)) continue;
if (IN(0, 0xE0, 0xC0) &&
IN(1, 0xC0, 0x80)) continue;
if (IN(0, 0xF0, 0xE0) &&
IN(1, 0xC0, 0x80) &&
IN(2, 0xC0, 0x80)) continue;
if (IN(0, 0xF8, 0xF0) &&
IN(1, 0xC0, 0x80) &&
IN(2, 0xC0, 0x80) &&
IN(3, 0xC0, 0x80)) continue;
return (char*)t;
#undef IN
}
return 0;
}
char *spl_utf8_import(const char *text, const char *charset)
{
const unsigned char *utext = (const unsigned char *)text;
charset_map_table_type *tab = 0;
if (!strcmp("utf_8", charset))
return strdup(text);
for (int i=0; charset_map[i].table; i++)
if (!strcmp(charset_map[i].name, charset))
tab = charset_map[i].table;
if (!tab)
return 0;
int result_len = 0;
for (const unsigned char *t = utext; *t; t++)
if ((*t & 0x80) == 0) result_len++;
else result_len += strlen((char*)(tab[*t-128]));
char *result = malloc(result_len+1);
char *r = result;
for (const unsigned char *t = utext; *t; t++)
if ((*t & 0x80) == 0) *(r++) = *t;
else {
strcpy(r, (const char*)tab[*t-128]);
r += strlen((const char*)tab[*t-128]);
}
assert(r == result+result_len);
result[result_len] = 0;
return result;
}
char *spl_utf8_export(const char *text, const char *charset)
{
const unsigned char *utext = (const unsigned char *)text;
charset_map_table_type *tab = 0;
if (!strcmp("utf_8", charset))
return strdup(text);
for (int i=0; charset_map[i].table; i++)
if (!strcmp(charset_map[i].name, charset))
tab = charset_map[i].table;
if (!tab)
return 0;
int result_len = 0;
char *result = malloc(strlen(text)+1);
int inc = 0;
for (const unsigned char *t = utext; *t; t += inc + 1)
{
#define IN(off, mask, value) ((t[inc=off] & (mask)) == (value))
if (IN(0, 0x80, 0x00)) {
result[result_len++] = t[0];
continue;
}
for (int i=0; i<128; i++) {
inc = strlen((const char*)tab[i]);
if (!strncmp((const char*)t, (const char*)tab[i], inc)) {
result[result_len++] = 128+i;
// in fact a strlen of 2 would result in t increase of 3
// decrement inc to get correct t increment in for loop
// raphael, 2007-10-08
inc--;
goto next_export_char;
}
}
result[result_len++] = '?';
if (IN(0, 0xE0, 0xC0) &&
IN(1, 0xC0, 0x80)) continue;
if (IN(0, 0xF0, 0xE0) &&
IN(1, 0xC0, 0x80) &&
IN(2, 0xC0, 0x80)) continue;
if (IN(0, 0xF8, 0xF0) &&
IN(1, 0xC0, 0x80) &&
IN(2, 0xC0, 0x80) &&
IN(3, 0xC0, 0x80)) continue;
/* Input is not UTF-8. This should not happen.. */
for (inc=1; t[inc] & 0x80; t++)
result[result_len++] = '?';
next_export_char:;
#undef IN
}
result[result_len++] = 0;
return realloc(result, result_len);
}
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