214 lines
6.9 KiB
Plaintext
214 lines
6.9 KiB
Plaintext
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/*
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* qrencode - QR Code encoder
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*
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* Input data splitter.
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* Copyright (C) 2006,2007 Kentaro Fukuchi <fukuchi@megaui.net>
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*
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* The following data / specifications are taken from
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* "Two dimensional symbol -- QR-code -- Basic Specification" (JIS X0510:2004)
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* or
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* "Automatic identification and data capture techniques --
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* QR Code 2005 bar code symbology specification" (ISO/IEC 18004:2006)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "qrencode.h"
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#include "qrinput.h"
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#include "qrspec.h"
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#include "split.h"
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#define isdigit(__c__) ((unsigned char)((signed char)(__c__) - '0') < 10)
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#define isalnum(__c__) (QRinput_lookAnTable(__c__) >= 0)
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static int Split_eatNum(const char *string, QRinput *input, int version, QRencodeMode hint, int casesensitive);
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static int Split_eatAn(const char *string, QRinput *input, int version, QRencodeMode hint, int casesensitive);
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static int Split_eat8(const char *string, QRinput *input, int version, QRencodeMode hint, int casesensitive);
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static int Split_eatKanji(const char *string, QRinput *input, int version, QRencodeMode hint, int casesensitive);
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static int Split_eatNum(const char *string, QRinput *input, int version, QRencodeMode hint, int casesensitive)
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{
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const char *p;
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int run;
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int dif;
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int ln;
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ln = QRspec_lengthIndicator(QR_MODE_NUM, version);
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p = string;
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while(isdigit(*p)) {
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p++;
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}
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run = p - string;
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if(*p & 0x80) {
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dif = QRinput_estimateBitsModeNum(run) + 4 + ln
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+ QRinput_estimateBitsMode8(1) /* + 4 + l8 */
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- QRinput_estimateBitsMode8(run + 1) /* - 4 - l8 */;
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if(dif > 0) {
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return Split_eat8(string, input, version, hint, casesensitive);
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}
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}
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if(isalnum(*p) && !casesensitive) {
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dif = QRinput_estimateBitsModeNum(run) + 4 + ln
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+ QRinput_estimateBitsModeAn(1) /* + 4 + la */
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- QRinput_estimateBitsModeAn(run + 1) /* - 4 - la */;
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if(dif > 0) {
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return Split_eatAn(string, input, version, hint, casesensitive);
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}
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}
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QRinput_append(input, QR_MODE_NUM, run, (unsigned char *)string);
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return run;
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}
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static int Split_eatAn(const char *string, QRinput *input, int version, QRencodeMode hint, int casesensitive)
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{
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const char *p, *q;
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int run;
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int dif;
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int la, ln;
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if(casesensitive) {
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return Split_eat8(string, input, version, hint, casesensitive);
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}
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la = QRspec_lengthIndicator(QR_MODE_AN, version);
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ln = QRspec_lengthIndicator(QR_MODE_NUM, version);
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p = string;
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while(isalnum(*p)) {
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if(isdigit(*p)) {
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q = p;
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while(isdigit(*q)) {
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q++;
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}
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dif = QRinput_estimateBitsModeAn(p - string) /* + 4 + la */
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+ QRinput_estimateBitsModeNum(q - p) + 4 + ln
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- QRinput_estimateBitsModeAn(q - string) /* - 4 - la */;
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if(dif < 0) {
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break;
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} else {
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p = q;
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}
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} else {
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p++;
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}
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}
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run = p - string;
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if(*p & 0x80) {
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dif = QRinput_estimateBitsModeAn(run) + 4 + la
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+ QRinput_estimateBitsMode8(1) /* + 4 + l8 */
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- QRinput_estimateBitsMode8(run + 1) /* - 4 - l8 */;
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if(dif > 0) {
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return Split_eat8(string, input, version, hint, casesensitive);
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}
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}
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QRinput_append(input, QR_MODE_AN, run, (unsigned char *)string);
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return run;
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}
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static int Split_eatKanji(const char *string, QRinput *input, int version, QRencodeMode hint, int casesensitive)
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{
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const char *p;
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p = string;
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while(QRinput_identifyMode(p) == QR_MODE_KANJI) {
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p += 2;
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}
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QRinput_append(input, QR_MODE_KANJI, p - string, (unsigned char *)string);
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return p - string;
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}
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static int Split_eat8(const char *string, QRinput *input, int version, QRencodeMode hint, int casesensitive)
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{
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const char *p, *q;
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QRencodeMode mode;
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int dif;
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int la, ln;
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la = QRspec_lengthIndicator(QR_MODE_AN, version);
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ln = QRspec_lengthIndicator(QR_MODE_NUM, version);
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p = string;
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while(*p != '\0') {
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mode = QRinput_identifyMode(p);
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if(hint == QR_MODE_KANJI && mode == QR_MODE_KANJI) {
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break;
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}
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if(mode != QR_MODE_8 && mode != QR_MODE_KANJI) {
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if(mode == QR_MODE_NUM) {
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q = p;
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while(isdigit(*q)) {
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q++;
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}
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dif = QRinput_estimateBitsMode8(p - string) /* + 4 + l8 */
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+ QRinput_estimateBitsModeNum(q - p) + 4 + ln
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- QRinput_estimateBitsMode8(q - string) /* - 4 - l8 */;
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if(dif < 0) {
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break;
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} else {
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p = q;
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}
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} else if(!casesensitive) {
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q = p;
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while(isalnum(*q)) {
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q++;
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}
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dif = QRinput_estimateBitsMode8(p - string) /* + 4 + l8 */
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+ QRinput_estimateBitsModeAn(q - p) + 4 + la
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- QRinput_estimateBitsMode8(q - string) /* - 4 - l8 */;
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if(dif < 0) {
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break;
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} else {
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p = q;
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}
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} else {
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p++;
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}
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} else {
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p++;
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}
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}
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QRinput_append(input, QR_MODE_8, p - string, (unsigned char *)string);
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return p - string;
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}
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void Split_splitStringToQRinput(const char *string, QRinput *input,
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int version, QRencodeMode hint, int casesensitive)
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{
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int length;
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QRencodeMode mode;
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if(*string == '\0') return;
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mode = QRinput_identifyMode(string);
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if(mode == QR_MODE_NUM) {
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length = Split_eatNum(string, input, version, hint, casesensitive);
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} else if(mode == QR_MODE_AN && !casesensitive) {
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length = Split_eatAn(string, input, version, hint, casesensitive);
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} else if(mode == QR_MODE_KANJI && hint == QR_MODE_KANJI) {
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length = Split_eatKanji(string, input, version, hint, casesensitive);
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} else {
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length = Split_eat8(string, input, version, hint, casesensitive);
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}
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if(length == 0) return;
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Split_splitStringToQRinput(&string[length], input, hint, mode, casesensitive);
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}
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