/// <summary>
/// Constructor for huffamn encoded image frame
/// </summary>
/// <param name="compressedBits">Compressed bits count</param>
/// <param name="colorCodes">Color code count</param>
/// <param name="maxCodeBitsLength">Longest bit length</param>
/// <param name="originalImageDataLength">Original image header length</param>
/// <param name="originalImageHeader">Original image header</param>
public HuffmanImageFrame(int compressedBits, HeaderColorItem[] colorCodes, int maxCodeBitsLength, int originalImageDataLength, byte[] originalImageHeader)
{
var imageDataTotalLength = _calculateImageDataTotalSize(compressedBits);
CompressedBits = compressedBits;
MaxCodeBitsLength = maxCodeBitsLength;
ColorCodeCount = colorCodes.Length;
OriginalImageHeaderLength = originalImageHeader.Length;
OriginalImageDataLength = originalImageDataLength;
var totalBytes = FixedHeaderLength + ColorCodeHeaderLength + OriginalImageHeaderLength + imageDataTotalLength;
Data = new byte[totalBytes];
CompressedBits.AsBytes().CopyBytesTo(Data, HEADER_COMPRESSED_BITS_BYTES_POS);
MaxCodeBitsLength.AsBytes().CopyBytesTo(Data, HEADER_MAX_CODE_BITS_BYTES_POS);
ColorCodeCount.AsBytes().CopyBytesTo(Data, HEADER_COLOR_CODE_COUNT_BYTES_POS);
OriginalImageHeaderLength.AsBytes().CopyBytesTo(Data, HEADER_ORIGINAL_IMAGE_HEADER_BYTES_POS);
OriginalImageDataLength.AsBytes().CopyBytesTo(Data, HEADER_ORIGINAL_IMAGE_DATA_BYTES_POS);
for (int i = 0; i < colorCodes.Length; i++)
{
var colorCode = colorCodes[i];
var headerIndex = i * HeaderColorItem.GetBytesLength() + FixedHeaderLength;
Data[headerIndex++] = (byte)colorCode.Symbol;
Data[headerIndex++] = (byte)colorCode.CodeBitsCount;
((uint)(colorCode.Code)).AsBytes().CopyBytesTo(Data, headerIndex);
}
originalImageHeader.CopyBytesTo(Data, FixedHeaderLength + ColorCodeHeaderLength);
}
/// <summary>
/// Reads color code item from header from given index
/// </summary>
/// <param name="index">Color code index</param>
/// <returns>Color code from given index</returns>
public HeaderColorItem GetColorCodeItemFromHeader(int index)
{
var colorStartIndex = index * HeaderColorItem.GetBytesLength() + FixedHeaderLength;
return(new HeaderColorItem(Data, colorStartIndex));
}
