private void ParseEncodingMessage(IBitIterator it, MessageMode mode)
{
if (!it.EndReached)
{
this.charCountIndicatorSymbolCode = CodeSymbolCode <CharCountIndicatorSymbol> .BuildInstance(it, new CharCountIndicatorSymbolFactory(mode));
this.characterCount = charCountIndicatorSymbolCode.GetSymbolAt(0).GetCharacterCount();
if (!it.EndReached)
{
switch (mode.Mode)
{
case MessageMode.EncodingMode.Byte:
this.Message = CodeSymbolCode <ByteEncodingSymbol> .BuildInstance(it, new ByteEncodingSymbolFactory(characterCount));
break;
case MessageMode.EncodingMode.Alphanumeric:
this.Message = CodeSymbolCode <AlphaNumericEncodingSymbol> .BuildInstance(it, new AlphaNumericEncodingSymbolFactory(characterCount));
break;
case MessageMode.EncodingMode.Numeric:
this.Message = CodeSymbolCode <NumericEncodingSymbol> .BuildInstance(it, new NumericEncodingSymbolFactory(characterCount));
break;
default:
throw new NotImplementedException($"{mode.Mode} decoding not implemented");
}
}
}
}
private static int[] ConvertToIntArray(CodeSymbolCode <RawCodeByte> code)
{
var symbolsAsInts = new int[code.SymbolCount];
for (int i = 0; i < code.SymbolCount; i++)
{
code.GetSymbolAt(i).TryGetAsByte(out var symbolAsByte);
symbolsAsInts[i] = symbolAsByte;
}
return(symbolsAsInts);
}
public static List <ECCBlock> DeInterleave(CodeSymbolCode <RawCodeByte> interleavedCode,
ErrorCorrectionLevel eccLevel)
{
// a block consists of data and ecc codewords for that block
// blocks are in groups of blocks with the same amount of data codewords (max 2 groups)
// blocks for all groups have the same amount of ecc codewords
// the number of data codewords can differ between groups but not between blocks of a group
var eccGroups = eccLevel.GetECCGroups();
int numberOfGroups = eccGroups.Length;
uint numberOfBlocks = 0;
uint numberOfRawCodeBytes = 0;
foreach (ECCGroupInfo g in eccGroups)
{
numberOfBlocks += g.NumberOfBlocks;
numberOfRawCodeBytes += g.NumberOfBlocks * (g.DataBytesPerBlock + eccLevel.ECCBytesPerBlock);
}
if (interleavedCode.SymbolCount != numberOfRawCodeBytes)
{
throw new ArgumentException("Invalid number of symbols in interleaved code.");
}
uint largestBlockLength = 0;
foreach (ECCGroupInfo g in eccGroups)
{
largestBlockLength = Math.Max(largestBlockLength, g.DataBytesPerBlock);
}
var dataCodewords = new RawCodeByte[numberOfBlocks, largestBlockLength];
var eccCodewords = new RawCodeByte[numberOfBlocks, eccLevel.ECCBytesPerBlock];
int pos = 0; // position in interleavedCode
// generate data block code
for (int j = 0; j < largestBlockLength; j++) // for each symbol in block
{
for (int i = 0; i < numberOfBlocks; i++) // for each block
{
if (j < DeInterleaver.GetBlockLength(i, eccGroups)) // skip block if it is already full
{
dataCodewords[i, j] = interleavedCode.GetSymbolAt(pos++);
System.Diagnostics.Debug.Assert(dataCodewords[i, j] != null);
}
}
}
// generate ecc block code
for (int j = 0; j < eccLevel.ECCBytesPerBlock; j++) // for each symbol in block
{
for (int i = 0; i < numberOfBlocks; i++) // for each block
{
eccCodewords[i, j] = interleavedCode.GetSymbolAt(pos++);
}
}
var eccBlockList = new List <ECCBlock>();
int absBlockNo = 0;
for (int g = 0; g < eccGroups.Length; g++) // group
{
for (int b = 0; b < eccGroups[g].NumberOfBlocks; b++) // block
{
var blockData = new List <RawCodeByte>();
var blockECC = new List <RawCodeByte>();
for (int s = 0; s < eccGroups[g].DataBytesPerBlock; s++) // data symbol
{
blockData.Add(dataCodewords[absBlockNo, s]);
}
for (int e = 0; e < eccLevel.ECCBytesPerBlock; e++) // ecc symbol
{
blockECC.Add(eccCodewords[absBlockNo, e]);
}
eccBlockList.Add(new ECCBlock(new CodeSymbolCode <RawCodeByte>(blockData),
new CodeSymbolCode <RawCodeByte>(blockECC)));
absBlockNo++;
}
}
return(eccBlockList);
}
