/// <summary>
/// The main decoder loop for the data
/// </summary>
/// <param name="w">the window decoder</param>
/// <param name="dictionary">the dictionary data</param>
/// <param name="target">the target data</param>
/// <param name="sout">the out stream</param>
/// <param name="customTable">custom table if any. Default is null.</param>
public BodyDecoder(WindowDecoder w, IByteBuffer dictionary, IByteBuffer target, ByteStreamWriter sout, CustomCodeTableDecoder customTable = null)
{
if (customTable != null)
{
this.customTable = customTable;
addressCache = new AddressCache((byte)customTable.NearSize, (byte)customTable.SameSize);
}
else
{
addressCache = new AddressCache();
}
window = w;
this.sout = sout;
dict = dictionary;
this.target = target;
targetData = new List <byte>();
}
/// <summary>
/// Use this after calling Start
/// Each time the decode is called it is expected
/// that at least 1 Window header is available in the stream
/// </summary>
/// <param name="bytesWritten">bytes decoded for all available windows</param>
/// <returns></returns>
public VCDiffResult Decode(out long bytesWritten)
{
if (!IsStarted)
{
bytesWritten = 0;
return(VCDiffResult.Error);
}
VCDiffResult result = VCDiffResult.Succes;
bytesWritten = 0;
if (!delta.CanRead)
{
return(VCDiffResult.EOD);
}
while (delta.CanRead)
{
//delta is streamed in order aka not random access
WindowDecoder w = new WindowDecoder(dict.Length, delta);
if (w.Decode(IsSDHCFormat))
{
using (BodyDecoder body = new BodyDecoder(w, dict, delta, sout))
{
if (IsSDHCFormat && w.AddRunLength == 0 && w.AddressesForCopyLength == 0 && w.InstructionAndSizesLength > 0)
{
//interleaved
//decodedinterleave actually has an internal loop for waiting and streaming the incoming rest of the interleaved window
result = body.DecodeInterleave();
if (result != VCDiffResult.Succes && result != VCDiffResult.EOD)
{
return(result);
}
bytesWritten += body.Decoded;
}
//technically add could be 0 if it is all copy instructions
//so do an or check on those two
else if (IsSDHCFormat && (w.AddRunLength > 0 || w.AddressesForCopyLength > 0) && w.InstructionAndSizesLength > 0)
{
//not interleaved
//expects the full window to be available
//in the stream
result = body.Decode();
if (result != VCDiffResult.Succes)
{
return(result);
}
bytesWritten += body.Decoded;
}
else if (!IsSDHCFormat)
{
//not interleaved
//expects the full window to be available
//in the stream
result = body.Decode();
if (result != VCDiffResult.Succes)
{
return(result);
}
bytesWritten += body.Decoded;
}
else
{
//invalid file
return(VCDiffResult.Error);
}
}
}
else
{
return((VCDiffResult)w.Result);
}
}
return(result);
}
