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/*
libdmtx - Data Matrix Encoding/Decoding Library
Copyright (C) 2008, 2009 Mike Laughton
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 (at your option) 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
Contact: mike@dragonflylogic.com
*/
/* $Id: dmtxmessage.c 667 2009-02-10 19:48:01Z mblaughton $ */
/**
* @file dmtxmessage.c
* @brief Data message handling
*/
/**
* @brief Allocate memory for message
* @param sizeIdx
* @param symbolFormat DmtxFormatMatrix | DmtxFormatMosaic
* @return Address of allocated memory
*/
extern DmtxMessage *
dmtxMessageCreate(int sizeIdx, int symbolFormat)
{
DmtxMessage *message;
int mappingRows, mappingCols;
assert(symbolFormat == DmtxFormatMatrix || symbolFormat == DmtxFormatMosaic);
mappingRows = dmtxGetSymbolAttribute(DmtxSymAttribMappingMatrixRows, sizeIdx);
mappingCols = dmtxGetSymbolAttribute(DmtxSymAttribMappingMatrixCols, sizeIdx);
message = (DmtxMessage *)calloc(1, sizeof(DmtxMessage));
if(message == NULL)
return NULL;
message->arraySize = sizeof(unsigned char) * mappingRows * mappingCols;
message->array = (unsigned char *)calloc(1, message->arraySize);
if(message->array == NULL) {
perror("Calloc failed");
dmtxMessageDestroy(&message);
return NULL;
}
message->codeSize = sizeof(unsigned char) *
dmtxGetSymbolAttribute(DmtxSymAttribSymbolDataWords, sizeIdx) +
dmtxGetSymbolAttribute(DmtxSymAttribSymbolErrorWords, sizeIdx);
if(symbolFormat == DmtxFormatMosaic)
message->codeSize *= 3;
message->code = (unsigned char *)calloc(message->codeSize, sizeof(unsigned char));
if(message->code == NULL) {
perror("Calloc failed");
dmtxMessageDestroy(&message);
return NULL;
}
/* XXX not sure if this is the right place or even the right approach.
Trying to allocate memory for the decoded data stream and will
initially assume that decoded data will not be larger than 2x encoded data */
message->outputSize = sizeof(unsigned char) * message->codeSize * 10;
message->output = (unsigned char *)calloc(message->outputSize, sizeof(unsigned char));
if(message->output == NULL) {
perror("Calloc failed");
dmtxMessageDestroy(&message);
return NULL;
}
return message;
}
/**
* @brief Free memory previously allocated for message
* @param message
* @return void
*/
extern DmtxPassFail
dmtxMessageDestroy(DmtxMessage **msg)
{
if(msg == NULL || *msg == NULL)
return DmtxFail;
if((*msg)->array != NULL)
free((*msg)->array);
if((*msg)->code != NULL)
free((*msg)->code);
if((*msg)->output != NULL)
free((*msg)->output);
free(*msg);
*msg = NULL;
return DmtxPass;
}
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