public PngDataChunk(byte[] chunkBytes)
{
Length = ByteUtils.ToUInt32(chunkBytes, 0);
byte[] type = new byte[4];
Array.Copy(chunkBytes, 4, type, 0, 4);
Type = new ChunkType(type);
data = new byte[Length];
Array.Copy(chunkBytes, 8, data, 0, Length);
CRC = ByteUtils.ToUInt32(chunkBytes, (int)(Length + 8));
ParseData();
}
public static List <PngDataChunk> GetChunks(byte[] imageBytes)
{
// Check for the eight-byte PNG signature
byte[] pngHeader = { 137, 80, 78, 71, 13, 10, 26, 10, };
for (int i = 0; i < 8; i++)
{
if (pngHeader[i] != imageBytes[i])
{
throw new ArgumentException("No PNG signature found");
}
}
List <PngDataChunk> chunks = new List <PngDataChunk>();
int k = 8;
while (true)
{
// get the data
UInt32 chunkLength = ByteUtils.ToUInt32(imageBytes, k);
k += 4;
ChunkType chunkType = new ChunkType(imageBytes, k);
k += 4;
byte[] chunkData = new byte[chunkLength];
for (int i = 0; i < chunkLength; i++, k++)
{
chunkData[i] = imageBytes[k];
}
UInt32 chunkCRC = ByteUtils.ToUInt32(imageBytes, k);
k += 4;
// create chunk from data and add it to list
PngDataChunk dataChunk = new PngDataChunk(chunkLength, chunkType, chunkData, chunkCRC);
chunks.Add(dataChunk);
// stop once we hit the IEND
if (chunkType.ToString() == "IEND")
{
break;
}
// TODO: proper error handling if IEND is never found
}
return(chunks);
}
public ParsedGAMA(byte[] data)
{
gamma = ByteUtils.ToUInt32(data);
}