/// <summary>
/// Creates a new Chunk from given byte data
/// </summary>
/// <param name="inputData">The data to read from</param>
/// <param name="offset">The offset in the byte array to start reading from</param>
/// <returns>The new Chunk</returns>
/// <exception cref="EndOfDataException">Unexpected end of Data</exception>
/// <exception cref="InvalidChunkException">If Chunk name is not valid or the read chunk length is negative</exception>
public static BaseChunk FromData(byte[] inputData, int offset, MSH owner)
{
if (inputData.Length < 8 || offset + 8 > inputData.Length)
{
Log.Add("Unexpected end of Data!", LogType.Error);
throw new EndOfDataException("Unexpected end of Data!");
}
BaseChunk chunk = new BaseChunk(owner);
//every chunk starts with a chunk name (4 bytes)
chunk.ChunkName = inputData.SubArray(offset, 4).GetString();
offset += 4;
//and an Int32 defining the length of the chunk (in bytes)
int length = BitConverter.ToInt32(inputData, offset);
offset += 4;
if (!Regex.Match(chunk.ChunkName, ValidChunkRegEx).Success)
{
Log.Add(chunk.ChunkName + " is not a valid Chunk Name!", LogType.Error);
throw new InvalidChunkException(chunk.ChunkName + " is not a valid Chunk Name!");
}
if (length < 0)
{
Log.Add(length + " is not a valid Chunk Length!", LogType.Error);
throw new InvalidChunkException(length + " is not a valid Chunk Length!");
}
if (offset + length > inputData.Length)
{
Log.Add("Unexpected end of Data!", LogType.Error);
throw new EndOfDataException("Unexpected end of Data!");
}
//create own data
chunk.data.AddRange(inputData.SubArray(offset, length));
chunk.ResetPosition();
Log.Add("Valid Chunk " + chunk.ChunkName + " found of length " + chunk.data.Count, LogType.Info);
return(chunk);
}
/// <summary>
/// Creates a new Chunk from given Stream
/// </summary>
/// <param name="stream">The Stream to read from</param>
/// <returns>The new Chunk</returns>
/// <exception cref="EndOfDataException">Unexpected end of Data</exception>
/// <exception cref="InvalidChunkException">If Chunk name is not valid or the read chunk length is negative</exception>
public static BaseChunk FromData(ChunkStream stream, MSH owner)
{
BaseChunk chunk = new BaseChunk(owner);
//every chunk starts with a chunk name (4 bytes)
chunk.ChunkName = stream.ReadString(4);
//and an Int32 defining the length of the chunk (in bytes)
int length = stream.ReadInt32();
if (!Regex.Match(chunk.ChunkName, ValidChunkRegEx).Success)
{
Log.Add(chunk.ChunkName + " is not a valid Chunk Name!", LogType.Error);
throw new InvalidChunkException(chunk.ChunkName + " is not a valid Chunk Name!");
}
if (length < 0)
{
Log.Add(length + " is not a valid Chunk Length!", LogType.Error);
throw new InvalidChunkException(length + " is not a valid Chunk Length!");
}
//read all the data
byte[] buffer = new byte[length];
try {
stream.Read(buffer, 0, length);
chunk.data.AddRange(buffer);
}
catch (ArgumentOutOfRangeException ex) {
Log.Add("Unexpected end of Data!", LogType.Error);
throw new EndOfDataException("Unexpected end of Data!", ex);
}
chunk.ResetPosition();
return(chunk);
}
