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qrencode.c 19.58 KB XiaoSK 提交于 2014-10-17 01:38 . 实现二维码,线程合二为一
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/*
* qrencode - QR Code encoder
*
* Copyright (C) 2006-2012 Kentaro Fukuchi <kentaro@fukuchi.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or any later version.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
//#if HAVE_CONFIG_H
# include "config.h"
//#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "qrencode.h"
#include "qrspec.h"
#include "mqrspec.h"
#include "bitstream.h"
#include "qrinput.h"
#include "rscode.h"
#include "split.h"
#include "mask.h"
#include "mmask.h"
/******************************************************************************
* Raw code
*****************************************************************************/
typedef struct {
int dataLength;
unsigned char *data;
int eccLength;
unsigned char *ecc;
} RSblock;
typedef struct {
int version;
int dataLength;
int eccLength;
unsigned char *datacode;
unsigned char *ecccode;
int b1;
int blocks;
RSblock *rsblock;
int count;
} QRRawCode;
static void RSblock_initBlock(RSblock *block, int dl, unsigned char *data, int el, unsigned char *ecc, RS *rs)
{
block->dataLength = dl;
block->data = data;
block->eccLength = el;
block->ecc = ecc;
encode_rs_char(rs, data, ecc);
}
static int RSblock_init(RSblock *blocks, int spec[5], unsigned char *data, unsigned char *ecc)
{
int i;
RSblock *block;
unsigned char *dp, *ep;
RS *rs;
int el, dl;
dl = QRspec_rsDataCodes1(spec);
el = QRspec_rsEccCodes1(spec);
rs = init_rs(8, 0x11d, 0, 1, el, 255 - dl - el);
if(rs == NULL) return -1;
block = blocks;
dp = data;
ep = ecc;
for(i=0; i<QRspec_rsBlockNum1(spec); i++) {
RSblock_initBlock(block, dl, dp, el, ep, rs);
dp += dl;
ep += el;
block++;
}
if(QRspec_rsBlockNum2(spec) == 0) return 0;
dl = QRspec_rsDataCodes2(spec);
el = QRspec_rsEccCodes2(spec);
rs = init_rs(8, 0x11d, 0, 1, el, 255 - dl - el);
if(rs == NULL) return -1;
for(i=0; i<QRspec_rsBlockNum2(spec); i++) {
RSblock_initBlock(block, dl, dp, el, ep, rs);
dp += dl;
ep += el;
block++;
}
return 0;
}
static void QRraw_free(QRRawCode *raw);
static QRRawCode *QRraw_new(QRinput *input)
{
QRRawCode *raw;
int spec[5], ret;
raw = (QRRawCode *)malloc(sizeof(QRRawCode));
if(raw == NULL) return NULL;
raw->datacode = QRinput_getByteStream(input);
if(raw->datacode == NULL) {
free(raw);
return NULL;
}
QRspec_getEccSpec(input->version, input->level, spec);
raw->version = input->version;
raw->b1 = QRspec_rsBlockNum1(spec);
raw->dataLength = QRspec_rsDataLength(spec);
raw->eccLength = QRspec_rsEccLength(spec);
raw->ecccode = (unsigned char *)malloc(raw->eccLength);
if(raw->ecccode == NULL) {
free(raw->datacode);
free(raw);
return NULL;
}
raw->blocks = QRspec_rsBlockNum(spec);
raw->rsblock = (RSblock *)calloc(raw->blocks, sizeof(RSblock));
if(raw->rsblock == NULL) {
QRraw_free(raw);
return NULL;
}
ret = RSblock_init(raw->rsblock, spec, raw->datacode, raw->ecccode);
if(ret < 0) {
QRraw_free(raw);
return NULL;
}
raw->count = 0;
return raw;
}
/**
* Return a code (byte).
* This function can be called iteratively.
* @param raw raw code.
* @return code
*/
static unsigned char QRraw_getCode(QRRawCode *raw)
{
int col, row;
unsigned char ret;
if(raw->count < raw->dataLength) {
row = raw->count % raw->blocks;
col = raw->count / raw->blocks;
if(col >= raw->rsblock[0].dataLength) {
row += raw->b1;
}
ret = raw->rsblock[row].data[col];
} else if(raw->count < raw->dataLength + raw->eccLength) {
row = (raw->count - raw->dataLength) % raw->blocks;
col = (raw->count - raw->dataLength) / raw->blocks;
ret = raw->rsblock[row].ecc[col];
} else {
return 0;
}
raw->count++;
return ret;
}
static void QRraw_free(QRRawCode *raw)
{
if(raw != NULL) {
free(raw->datacode);
free(raw->ecccode);
free(raw->rsblock);
free(raw);
}
}
/******************************************************************************
* Raw code for Micro QR Code
*****************************************************************************/
typedef struct {
int version;
int dataLength;
int eccLength;
unsigned char *datacode;
unsigned char *ecccode;
RSblock *rsblock;
int oddbits;
int count;
} MQRRawCode;
static void MQRraw_free(MQRRawCode *raw);
static MQRRawCode *MQRraw_new(QRinput *input)
{
MQRRawCode *raw;
RS *rs;
raw = (MQRRawCode *)malloc(sizeof(MQRRawCode));
if(raw == NULL) return NULL;
raw->version = input->version;
raw->dataLength = MQRspec_getDataLength(input->version, input->level);
raw->eccLength = MQRspec_getECCLength(input->version, input->level);
raw->oddbits = raw->dataLength * 8 - MQRspec_getDataLengthBit(input->version, input->level);
raw->datacode = QRinput_getByteStream(input);
if(raw->datacode == NULL) {
free(raw);
return NULL;
}
raw->ecccode = (unsigned char *)malloc(raw->eccLength);
if(raw->ecccode == NULL) {
free(raw->datacode);
free(raw);
return NULL;
}
raw->rsblock = (RSblock *)calloc(1, sizeof(RSblock));
if(raw->rsblock == NULL) {
MQRraw_free(raw);
return NULL;
}
rs = init_rs(8, 0x11d, 0, 1, raw->eccLength, 255 - raw->dataLength - raw->eccLength);
if(rs == NULL) {
MQRraw_free(raw);
return NULL;
}
RSblock_initBlock(raw->rsblock, raw->dataLength, raw->datacode, raw->eccLength, raw->ecccode, rs);
raw->count = 0;
return raw;
}
/**
* Return a code (byte).
* This function can be called iteratively.
* @param raw raw code.
* @return code
*/
static unsigned char MQRraw_getCode(MQRRawCode *raw)
{
unsigned char ret;
if(raw->count < raw->dataLength) {
ret = raw->datacode[raw->count];
} else if(raw->count < raw->dataLength + raw->eccLength) {
ret = raw->ecccode[raw->count - raw->dataLength];
} else {
return 0;
}
raw->count++;
return ret;
}
static void MQRraw_free(MQRRawCode *raw)
{
if(raw != NULL) {
free(raw->datacode);
free(raw->ecccode);
free(raw->rsblock);
free(raw);
}
}
/******************************************************************************
* Frame filling
*****************************************************************************/
typedef struct {
int width;
unsigned char *frame;
int x, y;
int dir;
int bit;
int mqr;
} FrameFiller;
static FrameFiller *FrameFiller_new(int width, unsigned char *frame, int mqr)
{
FrameFiller *filler;
filler = (FrameFiller *)malloc(sizeof(FrameFiller));
if(filler == NULL) return NULL;
filler->width = width;
filler->frame = frame;
filler->x = width - 1;
filler->y = width - 1;
filler->dir = -1;
filler->bit = -1;
filler->mqr = mqr;
return filler;
}
static unsigned char *FrameFiller_next(FrameFiller *filler)
{
unsigned char *p;
int x, y, w;
if(filler->bit == -1) {
filler->bit = 0;
return filler->frame + filler->y * filler->width + filler->x;
}
x = filler->x;
y = filler->y;
p = filler->frame;
w = filler->width;
if(filler->bit == 0) {
x--;
filler->bit++;
} else {
x++;
y += filler->dir;
filler->bit--;
}
if(filler->dir < 0) {
if(y < 0) {
y = 0;
x -= 2;
filler->dir = 1;
if(!filler->mqr && x == 6) {
x--;
y = 9;
}
}
} else {
if(y == w) {
y = w - 1;
x -= 2;
filler->dir = -1;
if(!filler->mqr && x == 6) {
x--;
y -= 8;
}
}
}
if(x < 0 || y < 0) return NULL;
filler->x = x;
filler->y = y;
if(p[y * w + x] & 0x80) {
// This tail recursion could be optimized.
return FrameFiller_next(filler);
}
return &p[y * w + x];
}
#ifdef WITH_TESTS
extern unsigned char *FrameFiller_test(int version)
{
int width;
unsigned char *frame, *p;
FrameFiller *filler;
int i, length;
width = QRspec_getWidth(version);
frame = QRspec_newFrame(version);
if(frame == NULL) return NULL;
filler = FrameFiller_new(width, frame, 0);
if(filler == NULL) {
free(frame);
return NULL;
}
length = QRspec_getDataLength(version, QR_ECLEVEL_L) * 8
+ QRspec_getECCLength(version, QR_ECLEVEL_L) * 8
+ QRspec_getRemainder(version);
for(i=0; i<length; i++) {
p = FrameFiller_next(filler);
if(p == NULL) {
free(filler);
free(frame);
return NULL;
}
*p = (unsigned char)(i & 0x7f) | 0x80;
}
free(filler);
return frame;
}
extern unsigned char *FrameFiller_testMQR(int version)
{
int width;
unsigned char *frame, *p;
FrameFiller *filler;
int i, length;
width = MQRspec_getWidth(version);
frame = MQRspec_newFrame(version);
if(frame == NULL) return NULL;
filler = FrameFiller_new(width, frame, 1);
if(filler == NULL) {
free(frame);
return NULL;
}
length = MQRspec_getDataLengthBit(version, QR_ECLEVEL_L)
+ MQRspec_getECCLength(version, QR_ECLEVEL_L) * 8;
for(i=0; i<length; i++) {
p = FrameFiller_next(filler);
if(p == NULL) {
fprintf(stderr, "Frame filler run over the frame!\n");
free(filler);
return frame;
}
*p = (unsigned char)(i & 0x7f) | 0x80;
}
free(filler);
return frame;
}
#endif
/******************************************************************************
* QR-code encoding
*****************************************************************************/
static QRcode *QRcode_new(int version, int width, unsigned char *data)
{
QRcode *qrcode;
qrcode = (QRcode *)malloc(sizeof(QRcode));
if(qrcode == NULL) return NULL;
qrcode->version = version;
qrcode->width = width;
qrcode->data = data;
return qrcode;
}
void QRcode_free(QRcode *qrcode)
{
if(qrcode != NULL) {
free(qrcode->data);
free(qrcode);
}
}
static QRcode *QRcode_encodeMask(QRinput *input, int mask)
{
int width, version;
QRRawCode *raw;
unsigned char *frame, *masked, *p, code, bit;
FrameFiller *filler;
int i, j;
QRcode *qrcode = NULL;
if(input->mqr) {
errno = EINVAL;
return NULL;
}
if(input->version < 0 || input->version > QRSPEC_VERSION_MAX) {
errno = EINVAL;
return NULL;
}
if(input->level > QR_ECLEVEL_H) {
errno = EINVAL;
return NULL;
}
raw = QRraw_new(input);
if(raw == NULL) return NULL;
version = raw->version;
width = QRspec_getWidth(version);
frame = QRspec_newFrame(version);
if(frame == NULL) {
QRraw_free(raw);
return NULL;
}
filler = FrameFiller_new(width, frame, 0);
if(filler == NULL) {
QRraw_free(raw);
free(frame);
return NULL;
}
/* inteleaved data and ecc codes */
for(i=0; i<raw->dataLength + raw->eccLength; i++) {
code = QRraw_getCode(raw);
bit = 0x80;
for(j=0; j<8; j++) {
p = FrameFiller_next(filler);
if(p == NULL) goto EXIT;
*p = 0x02 | ((bit & code) != 0);
bit = bit >> 1;
}
}
QRraw_free(raw);
raw = NULL;
/* remainder bits */
j = QRspec_getRemainder(version);
for(i=0; i<j; i++) {
p = FrameFiller_next(filler);
if(p == NULL) goto EXIT;
*p = 0x02;
}
/* masking */
if(mask == -2) { // just for debug purpose
masked = (unsigned char *)malloc(width * width);
memcpy(masked, frame, width * width);
} else if(mask < 0) {
masked = Mask_mask(width, frame, input->level);
} else {
masked = Mask_makeMask(width, frame, mask, input->level);
}
if(masked == NULL) {
goto EXIT;
}
qrcode = QRcode_new(version, width, masked);
EXIT:
QRraw_free(raw);
free(filler);
free(frame);
return qrcode;
}
static QRcode *QRcode_encodeMaskMQR(QRinput *input, int mask)
{
int width, version;
MQRRawCode *raw;
unsigned char *frame, *masked, *p, code, bit;
FrameFiller *filler;
int i, j;
QRcode *qrcode = NULL;
if(!input->mqr) {
errno = EINVAL;
return NULL;
}
if(input->version <= 0 || input->version > MQRSPEC_VERSION_MAX) {
errno = EINVAL;
return NULL;
}
if(input->level > QR_ECLEVEL_Q) {
errno = EINVAL;
return NULL;
}
raw = MQRraw_new(input);
if(raw == NULL) return NULL;
version = raw->version;
width = MQRspec_getWidth(version);
frame = MQRspec_newFrame(version);
if(frame == NULL) {
MQRraw_free(raw);
return NULL;
}
filler = FrameFiller_new(width, frame, 1);
if(filler == NULL) {
MQRraw_free(raw);
free(frame);
return NULL;
}
/* inteleaved data and ecc codes */
for(i=0; i<raw->dataLength + raw->eccLength; i++) {
code = MQRraw_getCode(raw);
if(raw->oddbits && i == raw->dataLength - 1) {
bit = 1 << raw->oddbits;
for(j=0; j<raw->oddbits; j++) {
p = FrameFiller_next(filler);
if(p == NULL) goto EXIT;
*p = 0x02 | ((bit & code) != 0);
bit = bit >> 1;
}
} else {
bit = 0x80;
for(j=0; j<8; j++) {
p = FrameFiller_next(filler);
if(p == NULL) goto EXIT;
*p = 0x02 | ((bit & code) != 0);
bit = bit >> 1;
}
}
}
MQRraw_free(raw);
raw = NULL;
/* masking */
if(mask < 0) {
masked = MMask_mask(version, frame, input->level);
} else {
masked = MMask_makeMask(version, frame, mask, input->level);
}
if(masked == NULL) {
goto EXIT;
}
qrcode = QRcode_new(version, width, masked);
EXIT:
MQRraw_free(raw);
free(filler);
free(frame);
return qrcode;
}
QRcode *QRcode_encodeInput(QRinput *input)
{
if(input->mqr) {
return QRcode_encodeMaskMQR(input, -1);
} else {
return QRcode_encodeMask(input, -1);
}
}
static QRcode *QRcode_encodeStringReal(const char *string, int version, QRecLevel level, int mqr, QRencodeMode hint, int casesensitive)
{
QRinput *input;
QRcode *code;
int ret;
if(string == NULL) {
errno = EINVAL;
return NULL;
}
if(hint != QR_MODE_8 && hint != QR_MODE_KANJI) {
errno = EINVAL;
return NULL;
}
if(mqr) {
input = QRinput_newMQR(version, level);
} else {
input = QRinput_new2(version, level);
}
if(input == NULL) return NULL;
ret = Split_splitStringToQRinput(string, input, hint, casesensitive);
if(ret < 0) {
QRinput_free(input);
return NULL;
}
code = QRcode_encodeInput(input);
QRinput_free(input);
return code;
}
QRcode *QRcode_encodeString(const char *string, int version, QRecLevel level, QRencodeMode hint, int casesensitive)
{
return QRcode_encodeStringReal(string, version, level, 0, hint, casesensitive);
}
QRcode *QRcode_encodeStringMQR(const char *string, int version, QRecLevel level, QRencodeMode hint, int casesensitive)
{
return QRcode_encodeStringReal(string, version, level, 1, hint, casesensitive);
}
static QRcode *QRcode_encodeDataReal(const unsigned char *data, int length, int version, QRecLevel level, int mqr)
{
QRinput *input;
QRcode *code;
int ret;
if(data == NULL || length == 0) {
errno = EINVAL;
return NULL;
}
if(mqr) {
input = QRinput_newMQR(version, level);
} else {
input = QRinput_new2(version, level);
}
if(input == NULL) return NULL;
ret = QRinput_append(input, QR_MODE_8, length, data);
if(ret < 0) {
QRinput_free(input);
return NULL;
}
code = QRcode_encodeInput(input);
QRinput_free(input);
return code;
}
QRcode *QRcode_encodeData(int size, const unsigned char *data, int version, QRecLevel level)
{
return QRcode_encodeDataReal(data, size, version, level, 0);
}
QRcode *QRcode_encodeString8bit(const char *string, int version, QRecLevel level)
{
if(string == NULL) {
errno = EINVAL;
return NULL;
}
return QRcode_encodeDataReal((unsigned char *)string, strlen(string), version, level, 0);
}
QRcode *QRcode_encodeDataMQR(int size, const unsigned char *data, int version, QRecLevel level)
{
return QRcode_encodeDataReal(data, size, version, level, 1);
}
QRcode *QRcode_encodeString8bitMQR(const char *string, int version, QRecLevel level)
{
if(string == NULL) {
errno = EINVAL;
return NULL;
}
return QRcode_encodeDataReal((unsigned char *)string, strlen(string), version, level, 1);
}
/******************************************************************************
* Structured QR-code encoding
*****************************************************************************/
static QRcode_List *QRcode_List_newEntry(void)
{
QRcode_List *entry;
entry = (QRcode_List *)malloc(sizeof(QRcode_List));
if(entry == NULL) return NULL;
entry->next = NULL;
entry->code = NULL;
return entry;
}
static void QRcode_List_freeEntry(QRcode_List *entry)
{
if(entry != NULL) {
QRcode_free(entry->code);
free(entry);
}
}
void QRcode_List_free(QRcode_List *qrlist)
{
QRcode_List *list = qrlist, *next;
while(list != NULL) {
next = list->next;
QRcode_List_freeEntry(list);
list = next;
}
}
int QRcode_List_size(QRcode_List *qrlist)
{
QRcode_List *list = qrlist;
int size = 0;
while(list != NULL) {
size++;
list = list->next;
}
return size;
}
#if 0
static unsigned char QRcode_parity(const char *str, int size)
{
unsigned char parity = 0;
int i;
for(i=0; i<size; i++) {
parity ^= str[i];
}
return parity;
}
#endif
QRcode_List *QRcode_encodeInputStructured(QRinput_Struct *s)
{
QRcode_List *head = NULL;
QRcode_List *tail = NULL;
QRcode_List *entry;
QRinput_InputList *list = s->head;
while(list != NULL) {
if(head == NULL) {
entry = QRcode_List_newEntry();
if(entry == NULL) goto ABORT;
head = entry;
tail = head;
} else {
entry = QRcode_List_newEntry();
if(entry == NULL) goto ABORT;
tail->next = entry;
tail = tail->next;
}
tail->code = QRcode_encodeInput(list->input);
if(tail->code == NULL) {
goto ABORT;
}
list = list->next;
}
return head;
ABORT:
QRcode_List_free(head);
return NULL;
}
static QRcode_List *QRcode_encodeInputToStructured(QRinput *input)
{
QRinput_Struct *s;
QRcode_List *codes;
s = QRinput_splitQRinputToStruct(input);
if(s == NULL) return NULL;
codes = QRcode_encodeInputStructured(s);
QRinput_Struct_free(s);
return codes;
}
static QRcode_List *QRcode_encodeDataStructuredReal(
int size, const unsigned char *data,
int version, QRecLevel level,
int eightbit, QRencodeMode hint, int casesensitive)
{
QRinput *input;
QRcode_List *codes;
int ret;
if(version <= 0) {
errno = EINVAL;
return NULL;
}
if(!eightbit && (hint != QR_MODE_8 && hint != QR_MODE_KANJI)) {
errno = EINVAL;
return NULL;
}
input = QRinput_new2(version, level);
if(input == NULL) return NULL;
if(eightbit) {
ret = QRinput_append(input, QR_MODE_8, size, data);
} else {
ret = Split_splitStringToQRinput((char *)data, input, hint, casesensitive);
}
if(ret < 0) {
QRinput_free(input);
return NULL;
}
codes = QRcode_encodeInputToStructured(input);
QRinput_free(input);
return codes;
}
QRcode_List *QRcode_encodeDataStructured(int size, const unsigned char *data, int version, QRecLevel level) {
return QRcode_encodeDataStructuredReal(size, data, version, level, 1, QR_MODE_NUL, 0);
}
QRcode_List *QRcode_encodeString8bitStructured(const char *string, int version, QRecLevel level) {
if(string == NULL) {
errno = EINVAL;
return NULL;
}
return QRcode_encodeDataStructured(strlen(string), (unsigned char *)string, version, level);
}
QRcode_List *QRcode_encodeStringStructured(const char *string, int version, QRecLevel level, QRencodeMode hint, int casesensitive)
{
if(string == NULL) {
errno = EINVAL;
return NULL;
}
return QRcode_encodeDataStructuredReal(strlen(string), (unsigned char *)string, version, level, 0, hint, casesensitive);
}
/******************************************************************************
* System utilities
*****************************************************************************/
void QRcode_APIVersion(int *major_version, int *minor_version, int *micro_version)
{
if(major_version != NULL) {
*major_version = MAJOR_VERSION;
}
if(minor_version != NULL) {
*minor_version = MINOR_VERSION;
}
if(micro_version != NULL) {
*micro_version = MICRO_VERSION;
}
}
char *QRcode_APIVersionString(void)
{
return VERSION;
}
void QRcode_clearCache(void)
{
QRspec_clearCache();
MQRspec_clearCache();
free_rs_cache();
}

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