public static SinHeader Read(BinaryReader r)
{
var h = new SinHeader();
h.Init(r, r.ReadInt32BE());
return(h);
}
public static void CopyTo(BinaryReader reader, Stream outStream)
{
// This implementation uses a BinaryReader without any Seek operation
// so it can be used with an archive stream
var header = SinHeader.Read(reader);
var dataHeader = MmcfBlock.Read(reader);
var orderedBlocks = dataHeader.DataBlocks.OrderBy(b => b.DataOffset).ToList();
var dummy = reader.ReadInt64BE(); // ??
var pos = 0L;
var firstOffset = orderedBlocks.FirstOrDefault()?.DataOffset ?? 0L;
if (firstOffset > pos)
{
reader.ReadBytes((int)firstOffset); // ??
pos = firstOffset;
}
var totalSize = orderedBlocks.Max(b => b.FileOffset + b.FileLen);
foreach (var block in orderedBlocks)
{
if (pos != block.DataOffset)
{
throw new Exception("Unexpected");
}
var data = reader.ReadBytes((int)block.DataLen);
pos += block.DataLen;
if (block is AddrBlock)
{
// fall through
}
else if (block is LZ4Block lz4Block)
{
var uncompData = new byte[lz4Block.UncompDataLen];
LZ4Codec.Decode(data, uncompData);
data = uncompData;
}
else
{
throw new NotImplementedException();
}
FileInfoBase.ReportProgress(outStream.Length, totalSize);
outStream.Seek(block.FileOffset, SeekOrigin.Begin);
outStream.Write(data, 0, data.Length);
}
}
