protected PNGChunk GetNextChunk(Stream stream)
{
PNGChunk value = new PNGChunk();
byte[] size = new byte[sizeof(uint)];
stream.Read(size, 0, sizeof(uint));
uint readLength = PNGUtils.ParseUint(size);
byte[] type = new byte[4];
stream.Read(type, 0, 4);
value.ChunkType = PNGUtils.ParseString(type, 4);
byte[] data = new byte[readLength];
stream.Read(data, 0, (int)readLength);
value.ChunkData = data;
byte[] crc = new byte[sizeof(uint)];
stream.Read(crc, 0, sizeof(uint));
uint readCRC = PNGUtils.ParseUint(crc);
uint calcCRC = value.CalculateCRC();
if (readCRC != calcCRC)
{
throw new ApplicationException($"PNG Chunk CRC Mismatch. Chunk CRC = {readCRC}, Calculated CRC = {calcCRC}.");
}
return(value);
}
