Qt下生成二维码，不需要调用外部库，适用于各平台的移植

/* * qrencode - QR Code encoder * * Input data chunk class * Copyright (C) 2006-2011 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" /****************************************************************************** * Utilities *****************************************************************************/ int QRinput_isSplittableMode(QRencodeMode mode) { return (mode >= QR_MODE_NUM && mode <= QR_MODE_KANJI); } /****************************************************************************** * Entry of input data *****************************************************************************/ static QRinput_List *QRinput_List_newEntry(QRencodeMode mode, int size, const unsigned char *data) { QRinput_List *entry; if(QRinput_check(mode, size, data)) { errno = EINVAL; return NULL; } entry = (QRinput_List *)malloc(sizeof(QRinput_List)); if(entry == NULL) return NULL; entry->mode = mode; entry->size = size; if(size > 0) { entry->data = (unsigned char *)malloc(size); if(entry->data == NULL) { free(entry); return NULL; } memcpy(entry->data, data, size); } entry->bstream = NULL; entry->next = NULL; return entry; } static void QRinput_List_freeEntry(QRinput_List *entry) { if(entry != NULL) { free(entry->data); BitStream_free(entry->bstream); free(entry); } } static QRinput_List *QRinput_List_dup(QRinput_List *entry) { QRinput_List *n; n = (QRinput_List *)malloc(sizeof(QRinput_List)); if(n == NULL) return NULL; n->mode = entry->mode; n->size = entry->size; n->data = (unsigned char *)malloc(n->size); if(n->data == NULL) { free(n); return NULL; } memcpy(n->data, entry->data, entry->size); n->bstream = NULL; n->next = NULL; return n; } /****************************************************************************** * Input Data *****************************************************************************/ QRinput *QRinput_new(void) { return QRinput_new2(0, QR_ECLEVEL_L); } QRinput *QRinput_new2(int version, QRecLevel level) { QRinput *input; if(version < 0 || version > QRSPEC_VERSION_MAX || level > QR_ECLEVEL_H) { errno = EINVAL; return NULL; } input = (QRinput *)malloc(sizeof(QRinput)); if(input == NULL) return NULL; input->head = NULL; input->tail = NULL; input->version = version; input->level = level; input->mqr = 0; input->fnc1 = 0; return input; } QRinput *QRinput_newMQR(int version, QRecLevel level) { QRinput *input; if(version <= 0 || version > MQRSPEC_VERSION_MAX) goto INVALID; if((MQRspec_getECCLength(version, level) == 0)) goto INVALID; input = QRinput_new2(version, level); if(input == NULL) return NULL; input->mqr = 1; return input; INVALID: errno = EINVAL; return NULL; } int QRinput_getVersion(QRinput *input) { return input->version; } int QRinput_setVersion(QRinput *input, int version) { if(input->mqr || version < 0 || version > QRSPEC_VERSION_MAX) { errno = EINVAL; return -1; } input->version = version; return 0; } QRecLevel QRinput_getErrorCorrectionLevel(QRinput *input) { return input->level; } int QRinput_setErrorCorrectionLevel(QRinput *input, QRecLevel level) { if(input->mqr || level > QR_ECLEVEL_H) { errno = EINVAL; return -1; } input->level = level; return 0; } int QRinput_setVersionAndErrorCorrectionLevel(QRinput *input, int version, QRecLevel level) { if(input->mqr) { if(version <= 0 || version > MQRSPEC_VERSION_MAX) goto INVALID; if((MQRspec_getECCLength(version, level) == 0)) goto INVALID; } else { if(version < 0 || version > QRSPEC_VERSION_MAX) goto INVALID; if(level > QR_ECLEVEL_H) goto INVALID; } input->version = version; input->level = level; return 0; INVALID: errno = EINVAL; return -1; } static void QRinput_appendEntry(QRinput *input, QRinput_List *entry) { if(input->tail == NULL) { input->head = entry; input->tail = entry; } else { input->tail->next = entry; input->tail = entry; } entry->next = NULL; } int QRinput_append(QRinput *input, QRencodeMode mode, int size, const unsigned char *data) { QRinput_List *entry; entry = QRinput_List_newEntry(mode, size, data); if(entry == NULL) { return -1; } QRinput_appendEntry(input, entry); return 0; } /** * Insert a structured-append header to the head of the input data. * @param input input data. * @param size number of structured symbols. * @param number index number of the symbol. (1 <= number <= size) * @param parity parity among input data. (NOTE: each symbol of a set of structured symbols has the same parity data) * @retval 0 success. * @retval -1 error occurred and errno is set to indeicate the error. See Execptions for the details. * @throw EINVAL invalid parameter. * @throw ENOMEM unable to allocate memory. */ __STATIC int QRinput_insertStructuredAppendHeader(QRinput *input, int size, int number, unsigned char parity) { QRinput_List *entry; unsigned char buf[3]; if(size > MAX_STRUCTURED_SYMBOLS) { errno = EINVAL; return -1; } if(number <= 0 || number > size) { errno = EINVAL; return -1; } buf[0] = (unsigned char)size; buf[1] = (unsigned char)number; buf[2] = parity; entry = QRinput_List_newEntry(QR_MODE_STRUCTURE, 3, buf); if(entry == NULL) { return -1; } entry->next = input->head; input->head = entry; return 0; } int QRinput_appendECIheader(QRinput *input, unsigned int ecinum) { unsigned char data[4]; if(ecinum > 999999) { errno = EINVAL; return -1; } /* We manually create byte array of ecinum because (unsigned char *)&ecinum may cause bus error on some architectures, */ data[0] = ecinum & 0xff; data[1] = (ecinum >> 8) & 0xff; data[2] = (ecinum >> 16) & 0xff; data[3] = (ecinum >> 24) & 0xff; return QRinput_append(input, QR_MODE_ECI, 4, data); } void QRinput_free(QRinput *input) { QRinput_List *list, *next; if(input != NULL) { list = input->head; while(list != NULL) { next = list->next; QRinput_List_freeEntry(list); list = next; } free(input); } } static unsigned char QRinput_calcParity(QRinput *input) { unsigned char parity = 0; QRinput_List *list; int i; list = input->head; while(list != NULL) { if(list->mode != QR_MODE_STRUCTURE) { for(i=list->size-1; i>=0; i--) { parity ^= list->data[i]; } } list = list->next; } return parity; } QRinput *QRinput_dup(QRinput *input) { QRinput *n; QRinput_List *list, *e; if(input->mqr) { n = QRinput_newMQR(input->version, input->level); } else { n = QRinput_new2(input->version, input->level); } if(n == NULL) return NULL; list = input->head; while(list != NULL) { e = QRinput_List_dup(list); if(e == NULL) { QRinput_free(n); return NULL; } QRinput_appendEntry(n, e); list = list->next; } return n; } /****************************************************************************** * Numeric data *****************************************************************************/ /** * Check the input data. * @param size * @param data * @return result */ static int QRinput_checkModeNum(int size, const char *dat