/// <summary>
/// Reads a four character code.
/// </summary>
/// <returns>Returns the code read. Never returns null.</returns>
public FourCharacterCode ReadFourCharacterCode()
{
Contract.Ensures(Contract.Result <FourCharacterCode>() != null);
var stream = this.CurrentStream;
return(FourCharacterCode.ReadFrom(stream));
}
public FileChunk ReadChunkHeader(Stream stream)
{
Contract.Requires(stream != null);
Check.IfArgumentNull(stream, "stream");
if (this.ValidateStreamPosition(8))
{
var chunk = new FileChunk();
chunk.ChunkId = FourCharacterCode.ReadFrom(stream);
chunk.DataLength = this.numberReader.ReadUInt32AsInt64(stream);
chunk.ParentPosition = stream.Position;
chunk.FilePosition = this.context.ChunkFile.BaseStream.Position;
chunk.DataStream = new SubStream(stream, chunk.DataLength);
return(chunk);
}
return(null);
}
/// <summary>
/// Reads the first (header) fields of a chunk from the <paramref name="stream"/>.
/// </summary>
/// <param name="stream">Must not be null.</param>
/// <returns>Returns null when the stream position does not allow to read the header.</returns>
/// <remarks>The following properties are set on the returned <see cref="FileChunk"/>.
/// <see cref="P:FileChunk.ChunkId"/>, <see cref="P:FileChunk.DataLength"/>,
/// <see cref="P:FileChunk.ParentPosition"/>, <see cref="P:FileChunk.FilePosition"/>
/// and <see cref="P:FileChunk.DataStream"/>.</remarks>
public FileChunk ReadChunkHeader(Stream stream)
{
Check.IfArgumentNull(stream, nameof(stream));
if (ValidateStreamPosition(8))
{
var chunk = new FileChunk
{
ChunkId = FourCharacterCode.ReadFrom(stream),
DataLength = _numberReader.ReadUInt32AsInt64(stream),
ParentPosition = stream.Position,
FilePosition = Context.ChunkFile.BaseStream.Position
};
chunk.DataStream = new SubStream(stream, chunk.DataLength);
return(chunk);
}
return(null);
}
/// <summary>
/// Reads a four character code.
/// </summary>
/// <returns>Returns the code read. Never returns null.</returns>
public FourCharacterCode ReadFourCharacterCode()
{
var stream = CurrentStream;
return(FourCharacterCode.ReadFrom(stream));
}