/*
* qrencode - QR-code encoder
*
* Copyright (C) 2006 Kentaro Fukuchi
*
* 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
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "qrencode.h"
#include "qrspec.h"
#include "bitstream.h"
#include "datastream.h"
/******************************************************************************
* Entry of input data stream
*****************************************************************************/
struct _QRenc_List {
QRenc_EncodeMode mode;
int size; ///< Size of data chunk (byte).
unsigned char *data; ///< Data chunk.
BitStream *bstream;
QRenc_List *next;
};
static QRenc_List *QRenc_newEntry(QRenc_EncodeMode mode, int size, unsigned char *data)
{
QRenc_List *entry;
if(QRenc_checkData(mode, size, data)) {
return NULL;
}
entry = (QRenc_List *)malloc(sizeof(QRenc_List));
entry->mode = mode;
entry->size = size;
entry->data = (unsigned char *)malloc(size);
memcpy(entry->data, data, size);
entry->bstream = NULL;
entry->next = NULL;
return entry;
}
static QRenc_List *QRenc_freeEntry(QRenc_List *entry)
{
QRenc_List *next;
next = entry->next;
free(entry->data);
if(entry->bstream) {
BitStream_free(entry->bstream);
}
free(entry);
return next;
}
/******************************************************************************
* Input Data stream
*****************************************************************************/
QRenc_DataStream *QRenc_newData(void)
{
QRenc_DataStream *stream;
stream = (QRenc_DataStream *)malloc(sizeof(QRenc_DataStream));
stream->head = NULL;
stream->tail = NULL;
stream->version = 0;
stream->level = QR_EC_LEVEL_L;
return stream;
}
int QRenc_getVersion(QRenc_DataStream *stream)
{
return stream->version;
}
void QRenc_setVersion(QRenc_DataStream *stream, int v)
{
stream->version = v;
}
void QRenc_setErrorCorrectionLevel(QRenc_DataStream *stream, QRenc_ErrorCorrectionLevel level)
{
stream->level = level;
}
QRenc_ErrorCorrectionLevel QRenc_getErrorCorrectionLevel(QRenc_DataStream *stream)
{
return stream->level;
}
int QRenc_appendData(QRenc_DataStream *stream, QRenc_EncodeMode mode, int size, unsigned char *data)
{
QRenc_List *entry;
entry = QRenc_newEntry(mode, size, data);
if(entry == NULL) {
return -1;
}
if(stream->tail == NULL) {
stream->head = entry;
stream->tail = entry;
} else {
stream->tail->next = entry;
stream->tail = entry;
}
return 0;
}
void QRenc_freeData(QRenc_DataStream *stream)
{
QRenc_List *list;
list = stream->head;
while(list != NULL) {
list = QRenc_freeEntry(list);
}
free(stream);
}
/******************************************************************************
* Numeric data
*****************************************************************************/
/**
* Check the input data.
* @param size
* @param data
* @return result
*/
static int QRenc_checkModeNum(int size, const char *data)
{
int i;
for(i=0; i<size; i++) {
if(data[i] < '0' || data[i] > '9')
return -1;
}
return 0;
}
/**
* Estimates the length of the encoded bit stream of numeric data.
* @param entry
* @return number of bits
*/
static int QRenc_estimateBitsModeNum(QRenc_List *entry)
{
int w;
int bits;
w = entry->size / 3;
bits = w * 10;
switch(entry->size - w * 3) {
case 1:
bits += 4;
break;
case 2:
bits += 7;
break;
default:
break;
}
return bits;
}
/**
* Convert the number data stream to a bit stream.
* @param entry
*/
static void QRenc_encodeModeNum(QRenc_List *entry, int version)
{
int words;
int i;
unsigned int val;
words = entry->size / 3;
entry->bstream = BitStream_new();
val = 0x1;
BitStream_appendNum(entry->bstream, 4, val);
val = entry->size;
BitStream_appendNum(entry->bstream, QRspec_lengthIndicator(QR_MODE_NUM, version), val);
for(i=0; i<words; i++) {
val = (entry->data[i*3 ] - '0') * 100;
val += (entry->data[i*3+1] - '0') * 10;
val += (entry->data[i*3+2] - '0');
BitStream_appendNum(entry->bstream, 10, val);
}
if(entry->size - words * 3 == 1) {
val = entry->data[words*3] - '0';
BitStream_appendNum(entry->bstream, 4, val);
} else if(entry->size - words * 3 == 2) {
val = (entry->data[words*3 ] - '0') * 10;
val += (entry->data[words*3+1] - '0');
BitStream_appendNum(entry->bstream, 7, val);
}
}
/******************************************************************************
* Alphabet-numeric data
*****************************************************************************/
static signed char anTable[] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
36, -1, -1, -1, 37, 38, -1, -1, -1, -1, 39, 40, -1, 41, 42, 43,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 44, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, -1, -1, -1, -1, -1
};
/**
* Look up the alphabet-numeric convesion table (see JIS X0510:2004, pp.19).
* @param c character
* @return value
*/
inline static signed char QRenc_lookAnTable(char c)
{
if(c & 0x80) {
return -1;
}
return anTable[(int)c];
}
/**
* Check the input data.
* @param size
* @param data
* @return result
*/
static int QRenc_checkModeAn(int size, const char *data)
{
int i;
for(i=0; i<size; i++) {
if(QRenc_lookAnTable(data[i]) < 0)
return -1;
}
return 0;
}
/**
* Estimates the length of the encoded bit stream of alphabet-numeric data.
* @param entry
* @return number of bits
*/
static int QRenc_estimateBitsModeAn(QRenc_List *entry)
{
int w;
int bits;
w = entry->size / 2;
bits = w * 11;
if(entry->size & 1) {
bits += 6;
}
return bits;
}
/**
* Convert the alphabet-numeric data stream to a bit stream.
* @param entry
*/
static void QRenc_encodeModeAn(QRenc_List *entry, int version)
{
int words;
int i;
unsigned int val;
words = entry->size / 2;
entry->bstream = BitStream_new();
val = 0x2;
BitStream_appendNum(entry->bstream, 4, val);
val = entry->size;
BitStream_appendNum(entry->bstream, QRspec_lengthIndicator(QR_MODE_AN, version), val);
for(i=0; i<words; i++) {
val = (unsigned int)QRenc_lookAnTable(entry->data[i*2 ]) * 45;
val += (unsigned int)QRenc_lookAnTable(entry->data[i*2+1]);
BitStream_appendNum(entry->bstream, 11, val);
}
if(entry->size & 1) {
val = (unsigned int)QRenc_lookAnTable(entry->data[words * 2]);
BitStream_appendNum(entry->bstream, 6, val);
}
}
/******************************************************************************
* 8 bit data
*****************************************************************************/
/**
* Estimates the length of the encoded bit stream of 8 bit data.
* @param entry
* @return number of bits
*/
static int QRenc_estimateBitsMode8(QRenc_List *entry)
{
return entry->size * 8;
}
/**
* Convert the 8bits data stream to a bit stream.
* @param entry
*/
static void QRenc_encodeMode8(QRenc_List *entry, int version)
{
int i;
unsigned int val;
entry->bstream = BitStream_new();
val = 0x4;
BitStream_appendNum(entry->bstream, 4, val);
val = entry->size;
BitStream_appendNum(entry->bstream, QRspec_lengthIndicator(QR_MODE_8, version), val);
for(i=0; i<entry->size; i++) {
BitStream_appendNum(entry->bstream, 8, entry->data[i]);
}
}
/******************************************************************************
* Kanji data
*****************************************************************************/
/**
* Estimates the length of the encoded bit stream of kanji data.
* @param entry
* @return number of bits
*/
static int QRenc_estimateBitsModeKanji(QRenc_List *entry)
{
return (entry->size / 2) * 13;
}
/**
* Check the input data.
* @param size
* @param data
* @return result
*/
static int QRenc_checkModeKanji(int size, const unsigned char *data)
{
int i;
unsigned int val;
if(size & 1)
return -1;
for(i=0; i<size; i+=2) {
val = ((unsigned int)data[i] << 8) | data[i+1];
if(val < 0x8140 || (val > 0x9ffc && val < 0xe040) || val > 0xebbf) {
return -1;
}
}
return 0;
}
/**
* Convert the kanji data stream to a bit stream.
* @param entry
*/
static void QRenc_encodeModeKanji(QRenc_List *entry, int version)
{
int i;
unsigned int val, h;
entry->bstream = BitStream_new();
val = 0x8;
BitStream_appendNum(entry->bstream, 4, val);
val = entry->size / 2;
BitStream_appendNum(entry->bstream, QRspec_lengthIndicator(QR_MODE_KANJI, version), val);
for(i=0; i<entry->size; i+=2) {
val = ((unsigned int)entry->data[i] << 8) | entry->data[i+1];
if(val <= 0x9ffc) {
val -= 0x8140;
} else {
val -= 0xc140;
}
h = (val >> 8) * 0xc0;
val = (val & 0xff) + h;
BitStream_appendNum(entry->bstream, 13, val);
}
}
/******************************************************************************
* Validation
*****************************************************************************/
/**
* Validate the input data
* @param mode
* @param size
* @param data
* @return result
*/
int QRenc_checkData(QRenc_EncodeMode mode, int size, const unsigned char *data)
{
switch(mode) {
case QR_MODE_NUM:
return QRenc_checkModeNum(size, (const char *)data);
break;
case QR_MODE_AN:
return QRenc_checkModeAn(size, (const char *)data);
break;
case QR_MODE_KANJI:
return QRenc_checkModeKanji(size, data);
break;
default:
break;
}
return 0;
}
/******************************************************************************
* Estimation of the bit length
*****************************************************************************/
/**
* Estimates the length of the encoded bit stream on the current version.
* @param entry
* @param version version of the symbol
* @return number of bits
*/
static int QRenc_estimateBitStreamSizeOfEntry(QRenc_List *entry, int version)
{
int bits = 0;
int l, m;
int num;
assert(entry != NULL);
switch(entry->mode) {
case QR_MODE_NUM:
bits = QRenc_estimateBitsModeNum(entry);
break;
case QR_MODE_AN:
bits = QRenc_estimateBitsModeAn(entry);
break;
case QR_MODE_8:
bits = QRenc_estimateBitsMode8(entry);
break;
case QR_MODE_KANJI:
bits = QRenc_estimateBitsModeKanji(entry);
break;
}
l = QRspec_lengthIndicator(entry->mode, version);
m = 1 << l;
num = (bits + m - 1) / m;
bits += num * (4 + l); // mode indicator (4bits) + length indicator
return bits;
}
/**
* Estimates the length of the encoded bit stream of the data stream.
* @param stream data stream
* @param version version of the symbol
* @return number of bits
*/
int QRenc_estimateBitStreamSize(QRenc_DataStream *stream, int version)
{
QRenc_List *list;
int bits = 0;
assert(stream != NULL);
list = stream->head;
while(list != NULL) {
bits += QRenc_estimateBitStreamSizeOfEntry(list, version);
list = list->next;
}
return bits;
}
/**
* Estimates the required version number of the symbol.
* @param stream data stream
* @return required version number
*/
static int QRenc_estimateVersion(QRenc_DataStream *stream)
{
int bits;
int new, prev;
new = 0;
do {
prev = new;
bits = QRenc_estimateBitStreamSize(stream, prev);
new = QRspec_getMinimumVersion((bits + 7) / 8, stream->level);
if (new == -1) {
return -1;
}
} while (new > prev);
return new;
}
/******************************************************************************
* Data conversion
*****************************************************************************/
/**
* Convert the data stream in the data chunk to a bit stream.
* @param entry
* @return number of bits
*/
static int QRenc_encodeBitStream(QRenc_List *entry, int version)
{
int words;
QRenc_List *st1, *st2;
assert(entry != NULL);
if(entry->bstream != NULL) {
BitStream_free(entry->bstream);
entry->bstream = NULL;
}
words = QRspec_maximumWords(entry->mode, version);
if(entry->size > words) {
st1 = QRenc_newEntry(entry->mode, words, entry->data);
st2 = QRenc_newEntry(entry->mode, entry->size - words, &entry->data[words]);
QRenc_encodeBitStream(st1, version);
QRenc_encodeBitStream(st2, version);
entry->bstream = BitStream_new();
BitStream_append(entry->bstream, st1->bstream);
BitStream_append(entry->bstream, st2->bstream);
QRenc_freeEntry(st1);
QRenc_freeEntry(st2);
} else {
switch(entry->mode) {
case QR_MODE_NUM:
QRenc_encodeModeNum(entry, version);
break;
case QR_MODE_AN:
QRenc_encodeModeAn(entry, version);
break;
case QR_MODE_8:
QRenc_encodeMode8(entry, version);
break;
case QR_MODE_KANJI:
QRenc_encodeModeKanji(entry, version);
break;
default:
break;
}
}
return BitStream_size(entry->bstream);
}
/**
* Convert the input data stream to a bit stream.
* @param stream input data stream.
* @return length of the bit stream.
*/
static int QRenc_createBitStream(QRenc_DataStream *stream)
{
QRenc_List *list;
int bits = 0;
assert(stream != NULL);
list = stream->head;
while(list != NULL) {
bits += QRenc_encodeBitStream(list, stream->version);
list = list->next;
}
return bits;
}
/**
* Convert the input data stream to a bit stream.
* When the version number is given and that is not sufficient, it is increased
* automatically.
* @param stream input data stream.
* @return -1 if the input data was too large. Otherwise 0.
*/
static int QRenc_convertData(QRenc_DataStream *stream)
{
int bits;
int ver;
ver = QRenc_estimateVersion(stream);
if(ver > QRenc_getVersion(stream)) {
QRenc_setVersion(stream, ver);
}
for(;;) {
bits = QRenc_createBitStream(stream);
ver = QRspec_getMinimumVersion((bits + 7) / 8, stream->level);
if(ver < 0) {
return -1;
} else if(ver > QRenc_getVersion(stream)) {
QRenc_setVersion(stream, ver);
} else {
break;
}
}
return 0;
}
/**
* Create padding bits for the input stream.
* @param stream input data stream.
* @return padding bit stream.
*/
static BitStream *QRenc_createPaddingBit(QRenc_DataStream *stream)
{
int bits, maxbits, words, maxwords, i;
QRenc_List *list;
BitStream *bstream;
if(stream->version <= 0)
return NULL;
maxwords = QRspec_getDataLength(stream->version, stream->level);
maxbits = maxwords * 8;
list = stream->head;
bits = 0;
while(list != NULL) {
bits += BitStream_size(list->bstream);
list = list->next;
}
words = (bits + 7) / 8;
if(bits == maxbits)
return NULL;
if(maxbits - bits < 5) {
bstream = BitStream_new();
BitStream_appendNum(bstream, maxbits - bits, 0);
return bstream;
}
bstream = BitStream_new();
BitStream_appendNum(bstream, words * 8 - bits, 0);
for(i=0; i<maxwords - words; i++) {
if(i & 1) {
BitStream_appendNum(bstream, 8, 0x11);
} else {
BitStream_appendNum(bstream, 8, 0xec);
}
}
return bstream;
}
/**
* Merge all bit streams in the input data stream
* @param stream input data stream.
* @return merged bit stream
*/
BitStream *QRenc_mergeBitStream(QRenc_DataStream *stream)
{
BitStream *bstream;
QRenc_List *list;
if(QRenc_convertData(stream) < 0) {
return NULL;
}
bstream = BitStream_new();
list = stream->head;
while(list != NULL) {
BitStream_append(bstream, list->bstream);
list = list->next;
}
return bstream;
}
/**
* Merge all bit streams in the input data stream and append padding bits
* @param stream input data stream.
* @return padded merged bit stream
*/
BitStream *QRenc_getBitStream(QRenc_DataStream *stream)
{
BitStream *bstream;
BitStream *padding;
bstream = QRenc_mergeBitStream(stream);
if(bstream == NULL) {
return NULL;
}
padding = QRenc_createPaddingBit(stream);
BitStream_append(bstream, padding);
BitStream_free(padding);
return bstream;
}
/**
* Pack all bit streams padding bits into a byte array.
* @param stream input data stream.
* @return padded merged byte stream
*/
unsigned char *QRenc_getByteStream(QRenc_DataStream *stream)
{
BitStream *bstream;
unsigned char *array;
bstream = QRenc_getBitStream(stream);
array = BitStream_toByte(bstream);
BitStream_free(bstream);
return array;
}
