qrinput.h

二维码QR的编码实现。C语言实现。希望各位一起学习。一起做条码开发

/*
 * qrencode - QR Code encoder
 *
 * Input data chunk class
 * Copyright (C) 2006, 2007, 2008 Kentaro Fukuchi <[e-mail]>
 *
 * 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
 */

#ifndef __QRINPUT_H__
#define __QRINPUT_H__

#include "qrencode.h"
#include "bitstream.h"

/******************************************************************************
 * Entry of input data
 *****************************************************************************/
typedef struct _QRinput_List QRinput_List;

struct _QRinput_List {
	QRencodeMode mode;
	int size;				///< Size of data chunk (byte).
	unsigned char *data;	///< Data chunk.
	BitStream *bstream;
	QRinput_List *next;
};

/******************************************************************************
 * Input Data
 *****************************************************************************/
struct _QRinput {
	int version;
	QRecLevel level;
	QRinput_List *head;
	QRinput_List *tail;
};

/******************************************************************************
 * Structured append input data
 *****************************************************************************/
typedef struct _QRinput_InputList QRinput_InputList;

struct _QRinput_InputList {
	QRinput *input;
	QRinput_InputList *next;
};

struct _QRinput_Struct {
	int size;					///< number of structured symbols
	int parity;
	QRinput_InputList *head;
	QRinput_InputList *tail;
};

/**
 * Insert a structured-append header to the head of the input data.
 * @param input input data.
 * @param size number of structured symbols.
 * @param index index number of the symbol. (1 <= index <= 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.
 */
extern int QRinput_insertStructuredAppendHeader(QRinput *input, int size, int index, unsigned char parity);

/**
 * Pack all bit streams padding bits into a byte array.
 * @param input input data.
 * @return padded merged byte stream
 */
extern unsigned char *QRinput_getByteStream(QRinput *input);


extern int QRinput_estimateBitsModeNum(int size);
extern int QRinput_estimateBitsModeAn(int size);
extern int QRinput_estimateBitsMode8(int size);
extern int QRinput_estimateBitsModeKanji(int size);

extern int QRinput_estimateBitStreamSize(QRinput *input, int version);
extern BitStream *QRinput_mergeBitStream(QRinput *input);
extern BitStream *QRinput_getBitStream(QRinput *input);
extern int QRinput_lengthOfCode(QRencodeMode mode, int version, int bits);
extern QRinput *QRinput_dup(QRinput *input);
extern int QRinput_splitEntry(QRinput_List *entry, int bytes);

extern const signed char QRinput_anTable[];

/**
 * Look up the alphabet-numeric convesion table (see JIS X0510:2004, pp.19).
 * @param __c__ character
 * @return value
 */
#define QRinput_lookAnTable(__c__) \
	((__c__ & 0x80)?-1:QRinput_anTable[(int)__c__])

/**
 * Length of a segment of structured-append header.
 */
#define STRUCTURE_HEADER_BITS 20

/**
 * Maximum number of symbols in a set of structured-appended symbols.
 */
#define MAX_STRUCTURED_SYMBOLS 16

#endif /* __QRINPUT_H__ */