public static SosHeader ReadSosHeader(byte[] bytes)
{
//SOS HEADER
UInt32 sosHeaderOffset = RawReader.FindByteValueIndex(bytes, 0xFF, 0xDA);
byte[] sosHeaderBytes = RawReader.ReadBytes(bytes, sosHeaderOffset);
UInt32 sosHeaderLengthOffset = 2;
byte[] sosHeaderLengthBytes = RawReader.ReadBytes(sosHeaderBytes, sosHeaderLengthOffset, 2);
UInt16 sosHeaderLength = ConvertHelper.ConvertToUInt16(sosHeaderLengthBytes, true);
UInt32 sosHeaderComponentsNumberOffset = 4;
byte sosHeaderComponentsNumber = RawReader.ReadByte(sosHeaderBytes, sosHeaderComponentsNumberOffset);
SosHeaderComponentInfo[] components = new SosHeaderComponentInfo[sosHeaderComponentsNumber];
UInt32 sosHeaderComponentsOffset = 5;
for (byte k = 0; k < sosHeaderComponentsNumber; k++)
{
SosHeaderComponentInfo componentInfo = RawReader.ReadSosHeaderComponentInfo(sosHeaderBytes, sosHeaderComponentsOffset);
components[k] = componentInfo;
sosHeaderComponentsOffset += 2;
}
return(new SosHeader()
{
Offset = sosHeaderOffset,
HeaderLength = sosHeaderLength,
Components = components
});
}
public static Sof3Header ReadSof3Header(byte[] bytes)
{
//SOF3 HEADER
UInt32 sof3HeaderOffset = RawReader.FindByteValueIndex(bytes, 0xFF, 0xC3);
byte[] sof3HeaderBytes = RawReader.ReadBytes(bytes, sof3HeaderOffset);
UInt32 sof3HeaderLengthOffset = 2;
byte[] sof3HeaderLengthBytes = RawReader.ReadBytes(sof3HeaderBytes, sof3HeaderLengthOffset, 2);
UInt16 sof3HeaderLength = ConvertHelper.ConvertToUInt16(sof3HeaderLengthBytes, true);
UInt32 sof3HeaderSamplePrecisionOffset = 4;
byte sof3HeaderSamplePrecision = RawReader.ReadByte(sof3HeaderBytes, sof3HeaderSamplePrecisionOffset);
UInt32 sof3HeaderLinesNumberOffset = 5;
byte[] sof3HeaderLinesNumberBytes = RawReader.ReadBytes(sof3HeaderBytes, sof3HeaderLinesNumberOffset, 2);
UInt16 sof3HeaderLinesNumber = ConvertHelper.ConvertToUInt16(sof3HeaderLinesNumberBytes, true);
UInt32 sof3HeaderSamplesPerLineNumberOffset = 7;
byte[] sof3HeaderSamplesPerLineNumberBytes = RawReader.ReadBytes(sof3HeaderBytes, sof3HeaderSamplesPerLineNumberOffset, 2);
UInt16 sof3HeaderSamplesPerLineNumber = ConvertHelper.ConvertToUInt16(sof3HeaderSamplesPerLineNumberBytes, true);
UInt32 sof3HeaderImageComponentsPerFrameNumberOffset = 9;
byte sof3HeaderImageComponentsPerFrameNumber = RawReader.ReadByte(sof3HeaderBytes, sof3HeaderImageComponentsPerFrameNumberOffset);
Sof3HeaderComponentInfo[] components = new Sof3HeaderComponentInfo[sof3HeaderImageComponentsPerFrameNumber];
UInt32 sof3HeaderComponentsOffset = 10;
for (byte k = 0; k < sof3HeaderImageComponentsPerFrameNumber; k++)
{
Sof3HeaderComponentInfo componentInfo = RawReader.ReadSof3HeaderComponentInfo(sof3HeaderBytes, sof3HeaderComponentsOffset);
components[k] = componentInfo;
sof3HeaderComponentsOffset += 3;
}
return(new Sof3Header()
{
Offset = sof3HeaderOffset,
HeaderLength = sof3HeaderLength,
SamplePrecision = sof3HeaderSamplePrecision,
LinesNumber = sof3HeaderLinesNumber,
SamplesPerLineNumber = sof3HeaderSamplesPerLineNumber,
Components = components
});
}
public static DhtHeader ReadDhtHeader(byte[] bytes)
{
UInt32 dhtHeaderOffset = RawReader.FindByteValueIndex(bytes, 0xFF, 0xC4);
byte[] dhtHeaderBytes = RawReader.ReadBytes(bytes, dhtHeaderOffset);
UInt32 dhtHeaderLengthOffset = 2;
byte[] dhtHeaderLengthBytes = RawReader.ReadBytes(dhtHeaderBytes, dhtHeaderLengthOffset, 2);
UInt16 dhtHeaderLength = ConvertHelper.ConvertToUInt16(dhtHeaderLengthBytes, true);
UInt32 valueHuffmanCodesOffset;
UInt32 lengthNumberHuffmanCodesSum = 0;
//Huffman table 1
UInt32 dhtHeaderTableIndexOffset = 4;
byte dhtHeaderTableIndex;
UInt32 tableOffset = dhtHeaderTableIndexOffset + 1;
HuffmanTable tableOne = new HuffmanTable();
dhtHeaderTableIndex = RawReader.ReadByte(dhtHeaderBytes, dhtHeaderTableIndexOffset);
tableOne.TableClass = (new HalvedByte(dhtHeaderTableIndex)).High;
tableOne.TableIndex = (new HalvedByte(dhtHeaderTableIndex)).Low;
byte[] lengthNumberHuffmanCodesBytes =
RawReader.ReadBytes(dhtHeaderBytes, tableOffset, DhtHeader.LENGTH_NUMBER_HUFFMAN_CODES_COUNT);
lengthNumberHuffmanCodesSum = Convert.ToUInt32(lengthNumberHuffmanCodesBytes.Sum(x => x));
valueHuffmanCodesOffset = tableOffset + DhtHeader.LENGTH_NUMBER_HUFFMAN_CODES_COUNT;
byte[] valueHuffmanCodesBytes = RawReader.ReadBytes(dhtHeaderBytes, valueHuffmanCodesOffset, lengthNumberHuffmanCodesSum);
tableOne.LengthHuffmanCodes = lengthNumberHuffmanCodesBytes;
tableOne.ValueHuffmanCodes = valueHuffmanCodesBytes;
//Huffman table 2
dhtHeaderTableIndexOffset = valueHuffmanCodesOffset + lengthNumberHuffmanCodesSum;
tableOffset = dhtHeaderTableIndexOffset + 1;
HuffmanTable tableTwo = new HuffmanTable();
dhtHeaderTableIndex = RawReader.ReadByte(dhtHeaderBytes, dhtHeaderTableIndexOffset);
tableTwo.TableClass = (new HalvedByte(dhtHeaderTableIndex)).High;
tableTwo.TableIndex = (new HalvedByte(dhtHeaderTableIndex)).Low;
lengthNumberHuffmanCodesBytes =
RawReader.ReadBytes(dhtHeaderBytes, tableOffset, DhtHeader.LENGTH_NUMBER_HUFFMAN_CODES_COUNT);
lengthNumberHuffmanCodesSum = Convert.ToUInt32(lengthNumberHuffmanCodesBytes.Sum(x => x));
valueHuffmanCodesOffset = tableOffset + DhtHeader.LENGTH_NUMBER_HUFFMAN_CODES_COUNT;
valueHuffmanCodesBytes = RawReader.ReadBytes(dhtHeaderBytes, valueHuffmanCodesOffset, lengthNumberHuffmanCodesSum);
tableTwo.LengthHuffmanCodes = lengthNumberHuffmanCodesBytes;
tableTwo.ValueHuffmanCodes = valueHuffmanCodesBytes;
return(new DhtHeader()
{
Offset = dhtHeaderOffset,
HeaderLength = dhtHeaderLength,
HuffmanTables = new HuffmanTable[] { tableOne, tableTwo }
});
}
