public override void BuildBuffer(IO.EndianStream blockStream, System.IO.Stream sourceFile,
Security.Cryptography.TigerHashBase hasher)
{
base.BuildBuffer(blockStream, sourceFile, hasher);
ComputeHash(blockStream, hasher);
Array.Copy(hasher.Hash, 0, CompressedDataTiger128, 0, CompressedDataTiger128.Length);
}
public void ComputeHash(IO.EndianStream blockStream, Security.Cryptography.TigerHashBase hasher)
{
Contract.Requires(blockStream != null);
Contract.Requires(hasher != null);
hasher.Initialize();
hasher.ComputeHash(blockStream.BaseStream,
(long)DataOffset, DataSize);
}
protected void UpdateDecompressedDataTigerHash(System.IO.Stream source, Security.Cryptography.TigerHashBase hasher)
{
hasher.ComputeHash(source, 0, (int)source.Length,
restorePosition: true);
ulong tiger64;
hasher.TryGetAsTiger64(out tiger64);
DecompressedDataTiger64 = tiger64;
}
public virtual void BuildBuffer(IO.EndianStream blockStream, Stream sourceFile
, Security.Cryptography.TigerHashBase hasher = null)
{
blockStream.AlignToBoundry(DataAlignmentBit);
sourceFile.Seek(0, SeekOrigin.Begin);
if (hasher != null)
{
UpdateDecompressedDataTigerHash(sourceFile, hasher);
}
Contract.Assert(blockStream.BaseStream.Position == blockStream.BaseStream.Length);
DataOffset = blockStream.PositionPtr;
// #TODO determine if compressing the sourceFile data has any savings (eg, 7% smaller)
var assumed_compression_type = CompressionType;
// #NOTE CompressionType can be Stored but IsDeflateStream can be true (seen it in XMB).
// So just handle the flag as we do EcfCompressionType.DeflateStream
if (IsDeflateStream)
{
assumed_compression_type = EcfCompressionType.DeflateStream;
}
switch (assumed_compression_type)
{
case EcfCompressionType.Stored:
{
// Update this ECF's size
DataSize = (int)sourceFile.Length;
// Also update this ECF's checksum
Adler32 = Security.Cryptography.Adler32.Compute(sourceFile, DataSize, restorePosition: true);
// Copy the source file's bytes to the block stream
sourceFile.CopyTo(blockStream.BaseStream);
break;
}
case EcfCompressionType.DeflateRaw:
CompressSourceToStream(blockStream.Writer, sourceFile);
break;
case EcfCompressionType.DeflateStream:
CompressSourceToCompressionStream(blockStream.Writer, sourceFile);
break;
default:
throw new KSoft.Debug.UnreachableException(assumed_compression_type.ToString());
}
Contract.Assert(blockStream.BaseStream.Position == ((long)DataOffset + DataSize));
}
