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dmtxsymbol.c
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dmtxsymbol.c
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/**
* libdmtx - Data Matrix Encoding/Decoding Library
* Copyright 2008, 2009 Mike Laughton. All rights reserved.
*
* See LICENSE file in the main project directory for full
* terms of use and distribution.
*
* Contact: Mike Laughton <mike@dragonflylogic.com>
*
* \file dmtxsymbol.c
* \brief Data Matrix symbol attributes
*/
/**
* \brief Retrieve property based on symbol size
* \param attribute
* \param sizeIdx
* \return Attribute value
*/
extern int
dmtxGetSymbolAttribute(int attribute, int sizeIdx)
{
static const int symbolRows[] = { 10, 12, 14, 16, 18, 20, 22, 24, 26,
32, 36, 40, 44, 48, 52,
64, 72, 80, 88, 96, 104,
120, 132, 144,
8, 8, 12, 12, 16, 16 };
static const int symbolCols[] = { 10, 12, 14, 16, 18, 20, 22, 24, 26,
32, 36, 40, 44, 48, 52,
64, 72, 80, 88, 96, 104,
120, 132, 144,
18, 32, 26, 36, 36, 48 };
static const int dataRegionRows[] = { 8, 10, 12, 14, 16, 18, 20, 22, 24,
14, 16, 18, 20, 22, 24,
14, 16, 18, 20, 22, 24,
18, 20, 22,
6, 6, 10, 10, 14, 14 };
static const int dataRegionCols[] = { 8, 10, 12, 14, 16, 18, 20, 22, 24,
14, 16, 18, 20, 22, 24,
14, 16, 18, 20, 22, 24,
18, 20, 22,
16, 14, 24, 16, 16, 22 };
static const int horizDataRegions[] = { 1, 1, 1, 1, 1, 1, 1, 1, 1,
2, 2, 2, 2, 2, 2,
4, 4, 4, 4, 4, 4,
6, 6, 6,
1, 2, 1, 2, 2, 2 };
static const int interleavedBlocks[] = { 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 2,
2, 4, 4, 4, 4, 6,
6, 8, 10,
1, 1, 1, 1, 1, 1 };
static const int symbolDataWords[] = { 3, 5, 8, 12, 18, 22, 30, 36, 44,
62, 86, 114, 144, 174, 204,
280, 368, 456, 576, 696, 816,
1050, 1304, 1558,
5, 10, 16, 22, 32, 49 };
static const int blockErrorWords[] = { 5, 7, 10, 12, 14, 18, 20, 24, 28,
36, 42, 48, 56, 68, 42,
56, 36, 48, 56, 68, 56,
68, 62, 62,
7, 11, 14, 18, 24, 28 };
static const int blockMaxCorrectable[] = { 2, 3, 5, 6, 7, 9, 10, 12, 14,
18, 21, 24, 28, 34, 21,
28, 18, 24, 28, 34, 28,
34, 31, 31,
3, 5, 7, 9, 12, 14 };
if(sizeIdx < 0 || sizeIdx >= DmtxSymbolSquareCount + DmtxSymbolRectCount)
return DmtxUndefined;
switch(attribute) {
case DmtxSymAttribSymbolRows:
return symbolRows[sizeIdx];
case DmtxSymAttribSymbolCols:
return symbolCols[sizeIdx];
case DmtxSymAttribDataRegionRows:
return dataRegionRows[sizeIdx];
case DmtxSymAttribDataRegionCols:
return dataRegionCols[sizeIdx];
case DmtxSymAttribHorizDataRegions:
return horizDataRegions[sizeIdx];
case DmtxSymAttribVertDataRegions:
return (sizeIdx < DmtxSymbolSquareCount) ? horizDataRegions[sizeIdx] : 1;
case DmtxSymAttribMappingMatrixRows:
return dataRegionRows[sizeIdx] *
dmtxGetSymbolAttribute(DmtxSymAttribVertDataRegions, sizeIdx);
case DmtxSymAttribMappingMatrixCols:
return dataRegionCols[sizeIdx] * horizDataRegions[sizeIdx];
case DmtxSymAttribInterleavedBlocks:
return interleavedBlocks[sizeIdx];
case DmtxSymAttribBlockErrorWords:
return blockErrorWords[sizeIdx];
case DmtxSymAttribBlockMaxCorrectable:
return blockMaxCorrectable[sizeIdx];
case DmtxSymAttribSymbolDataWords:
return symbolDataWords[sizeIdx];
case DmtxSymAttribSymbolErrorWords:
return blockErrorWords[sizeIdx] * interleavedBlocks[sizeIdx];
case DmtxSymAttribSymbolMaxCorrectable:
return blockMaxCorrectable[sizeIdx] * interleavedBlocks[sizeIdx];
}
return DmtxUndefined;
}
/**
* \brief Retrieve data size for a specific symbol size and block number
* \param sizeIdx
* \param blockIdx
* \return Attribute value
*/
extern int
dmtxGetBlockDataSize(int sizeIdx, int blockIdx)
{
int symbolDataWords;
int interleavedBlocks;
int count;
symbolDataWords = dmtxGetSymbolAttribute(DmtxSymAttribSymbolDataWords, sizeIdx);
interleavedBlocks = dmtxGetSymbolAttribute(DmtxSymAttribInterleavedBlocks, sizeIdx);
if(symbolDataWords < 1 || interleavedBlocks < 1)
return DmtxUndefined;
count = (int)(symbolDataWords/interleavedBlocks);
return (sizeIdx == DmtxSymbol144x144 && blockIdx < 8) ? count + 1 : count;
}
/**
* \brief Determine symbol size based on data size and requested properties
* \param dataWords
* \param sizeIdxRequest
* \return Symbol size index (or DmtxUndefined if none)
*/
static int
FindSymbolSize(int dataWords, int sizeIdxRequest)
{
int sizeIdx;
int idxBeg, idxEnd;
if(dataWords <= 0)
return DmtxUndefined;
if(sizeIdxRequest == DmtxSymbolSquareAuto || sizeIdxRequest == DmtxSymbolRectAuto) {
if(sizeIdxRequest == DmtxSymbolSquareAuto) {
idxBeg = 0;
idxEnd = DmtxSymbolSquareCount;
}
else {
idxBeg = DmtxSymbolSquareCount;
idxEnd = DmtxSymbolSquareCount + DmtxSymbolRectCount;
}
for(sizeIdx = idxBeg; sizeIdx < idxEnd; sizeIdx++) {
if(dmtxGetSymbolAttribute(DmtxSymAttribSymbolDataWords, sizeIdx) >= dataWords)
break;
}
if(sizeIdx == idxEnd)
return DmtxUndefined;
}
else {
sizeIdx = sizeIdxRequest;
}
if(dataWords > dmtxGetSymbolAttribute(DmtxSymAttribSymbolDataWords, sizeIdx))
return DmtxUndefined;
return sizeIdx;
}