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/* eci.c - Extended Channel Interpretations
libzint - the open source barcode library
Copyright (C) 2009 - 2020 Robin Stuart <rstuart114@gmail.com>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. 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.
3. Neither the name of the project 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 OWNER 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.
*/
/* vim: set ts=4 sw=4 et : */
#include <string.h>
#include <stdio.h>
#include "eci.h"
#include "common.h"
#ifdef _MSC_VER
#include <malloc.h>
#endif
/* Convert Unicode to other character encodings */
INTERNAL int utf_to_eci(const int eci, const unsigned char source[], unsigned char dest[], size_t *length) {
int in_posn;
int out_posn;
int ext;
int done;
if (eci == 26) {
/* Unicode mode, do not process - just copy data across */
memcpy(dest, source, *length);
dest[*length] = '\0';
return 0;
}
in_posn = 0;
out_posn = 0;
do {
/* Single byte (ASCII) character */
int bytelen = 1;
int glyph = (int) source[in_posn];
if ((source[in_posn] >= 0x80) && (source[in_posn] < 0xc0)) {
/* Something has gone wrong, abort */
return ZINT_ERROR_INVALID_DATA;
}
if ((source[in_posn] >= 0xc0) && (source[in_posn] < 0xe0)) {
/* Two-byte character */
bytelen = 2;
glyph = (source[in_posn] & 0x1f) << 6;
if ((int) *length < (in_posn + 2)) {
return ZINT_ERROR_INVALID_DATA;
}
if (source[in_posn + 1] > 0xc0) {
return ZINT_ERROR_INVALID_DATA;
}
glyph += (source[in_posn + 1] & 0x3f);
}
if ((source[in_posn] >= 0xe0) && (source[in_posn] < 0xf0)) {
/* Three-byte character */
bytelen = 3;
glyph = (source[in_posn] & 0x0f) << 12;
if ((int) *length < (in_posn + 2)) {
return ZINT_ERROR_INVALID_DATA;
}
if ((int) *length < (in_posn + 3)) {
return ZINT_ERROR_INVALID_DATA;
}
if (source[in_posn + 1] > 0xc0) {
return ZINT_ERROR_INVALID_DATA;
}
if (source[in_posn + 2] > 0xc0) {
return ZINT_ERROR_INVALID_DATA;
}
glyph += (source[in_posn + 1] & 0x3f) << 6;
glyph += (source[in_posn + 2] & 0x3f);
}
if (source[in_posn] >= 0xf0 || glyph > 0x2122) {
/* Not in any ISO 8859 or Windows page */
return ZINT_ERROR_INVALID_DATA;
}
if (glyph < 128) {
dest[out_posn] = glyph;
} else {
done = 0;
for (ext = 0; ext < 128; ext++) {
switch (eci) {
case 3: // Latin-1
if (glyph == iso_8859_1[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
case 4: // Latin-2
if (glyph == iso_8859_2[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
case 5: // Latin-3
if (glyph == iso_8859_3[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
case 6: // Latin-4
if (glyph == iso_8859_4[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
case 7: // Latin/Cyrillic
if (glyph == iso_8859_5[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
case 8: // Latin/Arabic
if (glyph == iso_8859_6[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
case 9: // Latin/Greek
if (glyph == iso_8859_7[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
case 10: // Latin/Hebrew
if (glyph == iso_8859_8[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
case 11: // Latin-5
if (glyph == iso_8859_9[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
case 12: // Latin-6
if (glyph == iso_8859_10[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
case 13: // Latin/Thai
if (glyph == iso_8859_11[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
case 15: // Latin-7
if (glyph == iso_8859_13[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
case 16: // Latin-8
if (glyph == iso_8859_14[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
case 17: // Latin-9
if (glyph == iso_8859_15[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
case 18: // Latin-10
if (glyph == iso_8859_16[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
case 21: // Windows-1250
if (glyph == windows_1250[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
case 22: // Windows-1251
if (glyph == windows_1251[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
case 23: // Windows-1252
if (glyph == windows_1252[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
case 24: // Windows-1256
if (glyph == windows_1256[ext]) {
dest[out_posn] = ext + 128;
done = 1;
}
break;
default:
break;
}
if (done) {
break;
}
}
if (!(done)) {
return ZINT_ERROR_INVALID_DATA;
}
}
in_posn += bytelen;
out_posn++;
} while (in_posn < (int) *length);
dest[out_posn] = '\0';
*length = out_posn;
return 0;
}
/* Find the lowest ECI mode which will encode a given set of Unicode text */
INTERNAL int get_best_eci(unsigned char source[], size_t length) {
int eci = 3;
#ifndef _MSC_VER
unsigned char local_source[length + 1];
#else
unsigned char *local_source = (unsigned char*) _alloca(length + 1);
#endif
do {
if (utf_to_eci(eci, source, local_source, &length) == 0) {
return eci;
}
eci++;
} while (eci < 25);
return 26; // If all of these fail, use Unicode!
}
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