internal static byte[] ComputeSignatureDigest(System.IO.Stream chunksStream
, long chunksOffset
, long chunksLength
, ECF.EcfHeader header)
{
Contract.Requires(chunksStream != null);
Contract.Requires(chunksStream.CanSeek && chunksStream.CanRead);
Contract.Requires(chunksOffset >= 0);
Contract.Requires(chunksLength > 0);
using (var sha = new SHA1CryptoServiceProvider())
{
PhxHash.UInt32(sha, kSha1Salt);
PhxHash.UInt32(sha, (uint)header.HeaderSize);
PhxHash.UInt32(sha, (uint)header.ChunkCount);
PhxHash.UInt32(sha, (uint)header.ExtraDataSize);
PhxHash.UInt32(sha, (uint)header.TotalSize);
PhxHash.Stream(sha,
chunksStream, chunksOffset, chunksLength,
isFinal: true);
return(sha.Hash);
}
}
bool ReadEcfFromStream()
{
bool result = true;
result = EcfHeader.VerifyIsEcf(mEcfStream.Reader);
if (!result)
{
if (VerboseOutput != null)
{
VerboseOutput.WriteLine("\tFailed: File is either not even an ECF-based file, or corrupt");
}
}
else
{
mEcfFile = new EcfFile();
mEcfFile.Serialize(mEcfStream);
}
return(result);
}
public void UpdateHeader(ref EcfHeader header)
{
Contract.Requires <InvalidOperationException>(HeaderId != 0);
header.InitializeChunkInfo(HeaderId, ChunkExtraDataSize);
}
public void CopyHeaderData(EcfHeader header)
{
HeaderId = header.Id;
ChunkExtraDataSize = header.ExtraDataSize;
}