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/*
* (C) Copyright 2008-2009 Jakub Zawadzki <darkjames@darkjames.ath.cx>
* Wojtek Kaniewski <wojtekka@irc.pl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License Version
* 2.1 as published by the Free Software Foundation.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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.
*/
#ifdef _WIN32
#include "win32.h"
#endif /* _WIN32 */
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "libgadu.h"
#include "encoding.h"
/**
* \file encoding.c
*
* \brief Funkcje konwersji kodowania tekstu
*/
/**
* \internal Tablica konwersji CP1250 na Unikod.
*/
static const uint16_t table_cp1250[] =
{
0x20ac, '?', 0x201a, '?', 0x201e, 0x2026, 0x2020, 0x2021,
'?', 0x2030, 0x0160, 0x2039, 0x015a, 0x0164, 0x017d, 0x0179,
'?', 0x2018, 0x2019, 0x201c, 0x201d, 0x2022, 0x2013, 0x2014,
'?', 0x2122, 0x0161, 0x203a, 0x015b, 0x0165, 0x017e, 0x017a,
0x00a0, 0x02c7, 0x02d8, 0x0141, 0x00a4, 0x0104, 0x00a6, 0x00a7,
0x00a8, 0x00a9, 0x015e, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x017b,
0x00b0, 0x00b1, 0x02db, 0x0142, 0x00b4, 0x00b5, 0x00b6, 0x00b7,
0x00b8, 0x0105, 0x015f, 0x00bb, 0x013d, 0x02dd, 0x013e, 0x017c,
0x0154, 0x00c1, 0x00c2, 0x0102, 0x00c4, 0x0139, 0x0106, 0x00c7,
0x010c, 0x00c9, 0x0118, 0x00cb, 0x011a, 0x00cd, 0x00ce, 0x010e,
0x0110, 0x0143, 0x0147, 0x00d3, 0x00d4, 0x0150, 0x00d6, 0x00d7,
0x0158, 0x016e, 0x00da, 0x0170, 0x00dc, 0x00dd, 0x0162, 0x00df,
0x0155, 0x00e1, 0x00e2, 0x0103, 0x00e4, 0x013a, 0x0107, 0x00e7,
0x010d, 0x00e9, 0x0119, 0x00eb, 0x011b, 0x00ed, 0x00ee, 0x010f,
0x0111, 0x0144, 0x0148, 0x00f3, 0x00f4, 0x0151, 0x00f6, 0x00f7,
0x0159, 0x016f, 0x00fa, 0x0171, 0x00fc, 0x00fd, 0x0163, 0x02d9,
};
/**
* \internal Zamienia tekst kodowany CP1250 na UTF-8.
*
* \param src Tekst źródłowy w CP1250.
* \param src_length Długość ciągu źródłowego (nigdy ujemna).
* \param dst_length Długość ciągu docelowego (jeśli -1, nieograniczona).
*
* \return Zaalokowany bufor z tekstem w UTF-8.
*/
static char *gg_encoding_convert_cp1250_utf8(const char *src, int src_length, int dst_length)
{
int i, j, len;
char *result = NULL;
for (i = 0, len = 0; (src[i] != 0) && (i < src_length); i++) {
uint16_t uc;
if ((unsigned char) src[i] < 0x80)
uc = (unsigned char) src[i];
else
uc = table_cp1250[(unsigned char) src[i] - 128];
if (uc < 0x80)
len += 1;
else if (uc < 0x800)
len += 2;
else
len += 3;
}
if ((dst_length != -1) && (len > dst_length))
len = dst_length;
result = (char *)malloc(len + 1);
if (result == NULL)
return NULL;
for (i = 0, j = 0; (src[i] != 0) && (i < src_length) && (j < len); i++) {
uint16_t uc;
if ((unsigned char) src[i] < 0x80)
uc = (unsigned char) src[i];
else
uc = table_cp1250[(unsigned char) src[i] - 128];
if (uc < 0x80)
result[j++] = uc;
else if (uc < 0x800) {
if (j + 1 > len)
break;
result[j++] = 0xc0 | ((uc >> 6) & 0x1f);
result[j++] = 0x80 | (uc & 0x3f);
} else {
if (j + 2 > len)
break;
result[j++] = 0xe0 | ((uc >> 12) & 0x1f);
result[j++] = 0x80 | ((uc >> 6) & 0x3f);
result[j++] = 0x80 | (uc & 0x3f);
}
}
result[j] = 0;
return result;
}
/**
* \internal Zamienia tekst kodowany UTF-8 na CP1250.
*
* \param src Tekst źródłowy w UTF-8.
* \param src_length Długość ciągu źródłowego (nigdy ujemna).
* \param dst_length Długość ciągu docelowego (jeśli -1, nieograniczona).
*
* \return Zaalokowany bufor z tekstem w CP1250.
*/
static char *gg_encoding_convert_utf8_cp1250(const char *src, int src_length, int dst_length)
{
char *result;
int i, j, len, uc_left = 0;
uint32_t uc = 0, uc_min = 0;
for (i = 0, len = 0; (src[i] != 0) && (i < src_length); i++) {
if ((src[i] & 0xc0) != 0x80)
len++;
}
if ((dst_length != -1) && (len > dst_length))
len = dst_length;
result = (char *)malloc(len + 1);
if (result == NULL)
return NULL;
for (i = 0, j = 0; (src[i] != 0) && (i < src_length) && (j < len); i++) {
if ((unsigned char) src[i] >= 0xf5) {
if (uc_left != 0)
result[j++] = '?';
/* Restricted sequences */
result[j++] = '?';
uc_left = 0;
} else if ((src[i] & 0xf8) == 0xf0) {
if (uc_left != 0)
result[j++] = '?';
uc = src[i] & 0x07;
uc_left = 3;
uc_min = 0x10000;
} else if ((src[i] & 0xf0) == 0xe0) {
if (uc_left != 0)
result[j++] = '?';
uc = src[i] & 0x0f;
uc_left = 2;
uc_min = 0x800;
} else if ((src[i] & 0xe0) == 0xc0) {
if (uc_left != 0)
result[j++] = '?';
uc = src[i] & 0x1f;
uc_left = 1;
uc_min = 0x80;
} else if ((src[i] & 0xc0) == 0x80) {
if (uc_left > 0) {
uc <<= 6;
uc |= src[i] & 0x3f;
uc_left--;
if (uc_left == 0) {
int valid = 0;
int k;
if (uc >= uc_min) {
for (k = 0; k < 128; k++) {
if (uc == table_cp1250[k]) {
result[j++] = k + 128;
valid = 1;
break;
}
}
}
if (!valid && uc != 0xfeff) /* Byte Order Mark */
result[j++] = '?';
}
}
} else {
if (uc_left != 0) {
result[j++] = '?';
uc_left = 0;
}
result[j++] = src[i];
}
}
if ((uc_left != 0) && (src[i] == 0))
result[j++] = '?';
result[j] = 0;
return result;
}
/**
* \internal Zamienia kodowanie tekstu.
*
* \param src Tekst źródłowy.
* \param src_encoding Kodowanie tekstu źródłowego.
* \param dst_encoding Kodowanie tekstu docelowego.
* \param src_length Długość ciągu źródłowego w bajtach (nigdy ujemna).
* \param dst_length Długość ciągu docelowego w bajtach (jeśli -1, nieograniczona).
*
* \return Zaalokowany bufor z tekstem w kodowaniu docelowym.
*/
char *gg_encoding_convert(const char *src, gg_encoding_t src_encoding, gg_encoding_t dst_encoding, int src_length, int dst_length)
{
char *result;
if (src == NULL) {
errno = EINVAL;
return NULL;
}
// specjalny przypadek obsługiwany ekspresowo
if ((dst_encoding == src_encoding) && (dst_length == -1) && (src_length == -1))
return strdup(src);
if (src_length == -1)
src_length = strlen(src);
if (dst_encoding == src_encoding) {
int len;
if (dst_length == -1)
len = src_length;
else
len = (src_length < dst_length) ? src_length : dst_length;
result = (char *)malloc(len + 1);
if (result == NULL)
return NULL;
strncpy(result, src, len);
result[len] = 0;
return result;
}
if (dst_encoding == GG_ENCODING_CP1250 && src_encoding == GG_ENCODING_UTF8)
return gg_encoding_convert_utf8_cp1250(src, src_length, dst_length);
if (dst_encoding == GG_ENCODING_UTF8 && src_encoding == GG_ENCODING_CP1250)
return gg_encoding_convert_cp1250_utf8(src, src_length, dst_length);
errno = EINVAL;
return NULL;
}
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