public BlockContentsSource CreateBlockContentsSourceAndSeekToFileHeadersStart(Context context, BlockHeader block)
{
BlockContentsSource.BlockFlags blockFlags = new BlockContentsSource.BlockFlags(block.IsCompressed, block.IsEncrypted, block.HasContiguousDataSection, block.IsDeleted);
if (block.HasContiguousDataSection)
{
long contiguousDataInfoStart = block.Offset - 16;
long fileHeadersStart = contiguousDataInfoStart - block.CompressedFileHeadersSize;
var memResInfo = context.Reader.ReadMemoryResidentBlockInfo(contiguousDataInfoStart);
long dataStart = fileHeadersStart - memResInfo.CompressedSize;
var result = new BlockContentsSource(context.ContainerFilePath, blockFlags, dataStart, memResInfo.CompressedSize, memResInfo.UncompressedSize);
context.Reader.StreamPosition = fileHeadersStart;
return(result);
}
else
{
long fileHeadersStart = block.Offset - block.CompressedFileHeadersSize;
context.Reader.StreamPosition = fileHeadersStart;
return(new BlockContentsSource(context.ContainerFilePath, blockFlags));
}
}
public void LoadFileHeaders(Context context, BlockHeader block)
{
BlockContentsSource blockContentsSource = this.CreateBlockContentsSourceAndSeekToFileHeadersStart(context, block);
BinaryReader fileHeaderReader = context.Reader.BaseReader;
try {
fileHeaderReader = this.GetReaderForPotentiallyEncryptedBlock(context, fileHeaderReader, block);
fileHeaderReader = this.GetReaderForPotentiallyCompressedBlock(context, fileHeaderReader, block);
using (var structureReader = new ContainerFileLoaderStructureReader(fileHeaderReader, leaveOpen: fileHeaderReader == context.Reader.BaseReader)) {
for (int fileIndex = 0; fileIndex < block.NumFiles; ++fileIndex)
{
long?errorOffset = block.IsCompressed ? default(long?) : context.Reader.StreamPosition;
var fileHeader = structureReader.ReadFileHeader();
fileHeader = context.FileHeaderTransformer.Transform(fileHeader);
this.verifier.VerifyFileHeader(fileHeader, block.IsCompressed, errorOffset);
this.AddFileToFileSystem(context, fileHeader, blockContentsSource);
}
}
} finally {
if (fileHeaderReader != context.Reader.BaseReader)
{
fileHeaderReader.Dispose();
}
}
}