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310 lines
10 KiB
C
310 lines
10 KiB
C
/* eci.c - Extended Channel Interpretations
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libzint - the open source barcode library
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Copyright (C) 2009-2017 Robin Stuart <rstuart114@gmail.com>
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. Neither the name of the project nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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*/
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "eci.h"
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#include "zint.h"
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#ifdef _MSC_VER
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#include <malloc.h>
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#endif
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/* Convert Unicode to other character encodings */
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int utf_to_eci(int eci, const unsigned char source[], unsigned char dest[], int *length) {
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int glyph;
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int bytelen;
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int in_posn;
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int out_posn;
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int ext;
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int done;
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if (eci == 26) {
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/* Unicode mode, do not process - just copy data across */
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for (in_posn = 0; in_posn < *length; in_posn++) {
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dest[in_posn] = source[in_posn];
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}
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dest[*length] = '\0';
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return 0;
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}
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in_posn = 0;
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out_posn = 0;
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do {
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/* Single byte (ASCII) character */
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bytelen = 1;
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glyph = (int) source[in_posn];
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if ((source[in_posn] >= 0x80) && (source[in_posn] < 0xc0)) {
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/* Something has gone wrong, abort */
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return ZINT_ERROR_INVALID_DATA;
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}
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if ((source[in_posn] >= 0xc0) && (source[in_posn] < 0xe0)) {
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/* Two-byte character */
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bytelen = 2;
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glyph = (source[in_posn] & 0x1f) << 6;
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if (*length < (in_posn + 2)) {
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return ZINT_ERROR_INVALID_DATA;
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}
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if (source[in_posn + 1] > 0xc0) {
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return ZINT_ERROR_INVALID_DATA;
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}
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glyph += (source[in_posn + 1] & 0x3f);
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}
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if ((source[in_posn] >= 0xe0) && (source[in_posn] < 0xf0)) {
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/* Three-byte character */
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bytelen = 3;
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glyph = (source[in_posn] & 0x0f) << 12;
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if (*length < (in_posn + 2)) {
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return ZINT_ERROR_INVALID_DATA;
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}
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if (*length < (in_posn + 3)) {
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return ZINT_ERROR_INVALID_DATA;
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}
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if (source[in_posn + 1] > 0xc0) {
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return ZINT_ERROR_INVALID_DATA;
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}
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if (source[in_posn + 2] > 0xc0) {
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return ZINT_ERROR_INVALID_DATA;
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}
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glyph += (source[in_posn + 1] & 0x3f) << 6;
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glyph += (source[in_posn + 2] & 0x3f);
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}
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if ((source[in_posn] >= 0xf0) && (source[in_posn] < 0xf7)) {
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/* Four-byte character */
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bytelen = 4;
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glyph = (source[in_posn] & 0x07) << 18;
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if (*length < (in_posn + 2)) {
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return ZINT_ERROR_INVALID_DATA;
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}
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if (*length < (in_posn + 3)) {
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return ZINT_ERROR_INVALID_DATA;
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}
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if (*length < (in_posn + 4)) {
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return ZINT_ERROR_INVALID_DATA;
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}
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if (source[in_posn + 1] > 0xc0) {
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return ZINT_ERROR_INVALID_DATA;
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}
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if (source[in_posn + 2] > 0xc0) {
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return ZINT_ERROR_INVALID_DATA;
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}
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if (source[in_posn + 3] > 0xc0) {
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return ZINT_ERROR_INVALID_DATA;
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}
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glyph += (source[in_posn + 1] & 0x3f) << 12;
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glyph += (source[in_posn + 2] & 0x3f) << 6;
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glyph += (source[in_posn + 3] & 0x3f);
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}
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if (source[in_posn] >= 0xf7) {
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/* More than 4 bytes not supported */
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return ZINT_ERROR_INVALID_DATA;
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}
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if (glyph < 128) {
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dest[out_posn] = glyph;
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} else {
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done = 0;
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for (ext = 0; ext < 128; ext++) {
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switch (eci) {
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case 3: // Latin-1
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if (glyph == iso_8859_1[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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case 4: // Latin-2
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if (glyph == iso_8859_2[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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case 5: // Latin-3
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if (glyph == iso_8859_3[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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case 6: // Latin-4
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if (glyph == iso_8859_4[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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case 7: // Latin/Cyrillic
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if (glyph == iso_8859_5[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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case 8: // Latin/Arabic
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if (glyph == iso_8859_6[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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case 9: // Latin/Greek
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if (glyph == iso_8859_7[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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case 10: // Latin/Hebrew
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if (glyph == iso_8859_8[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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case 11: // Latin-5
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if (glyph == iso_8859_9[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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case 12: // Latin-6
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if (glyph == iso_8859_10[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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case 13: // Latin/Thai
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if (glyph == iso_8859_11[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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case 15: // Latin-7
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if (glyph == iso_8859_13[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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case 16: // Latin-8
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if (glyph == iso_8859_14[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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case 17: // Latin-9
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if (glyph == iso_8859_15[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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case 18: // Latin-10
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if (glyph == iso_8859_16[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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case 21: // Windows-1250
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if (glyph == windows_1250[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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case 22: // Windows-1251
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if (glyph == windows_1251[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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case 23: // Windows-1252
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if (glyph == windows_1252[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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case 24: // Windows-1256
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if (glyph == windows_1256[ext]) {
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dest[out_posn] = ext + 128;
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done = 1;
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}
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break;
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default:
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break;
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}
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}
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if (!(done)) {
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return ZINT_ERROR_INVALID_DATA;
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}
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}
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in_posn += bytelen;
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out_posn++;
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} while (in_posn < *length);
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dest[out_posn] = '\0';
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*length = out_posn;
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return 0;
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}
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/* Find the lowest ECI mode which will encode a given set of Unicode text */
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int get_best_eci(unsigned char source[], int length) {
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int eci = 3;
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#ifndef _MSC_VER
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unsigned char local_source[length + 1];
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#else
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unsigned char *local_source = (unsigned char*) _alloca(length + 1);
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#endif
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do {
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if (utf_to_eci(eci, source, local_source, &length) == 0) {
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return eci;
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}
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eci++;
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} while (eci < 25);
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return 26; // If all of these fail, use Unicode!
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}
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