private static RootIndexBlock ReadRootBlock(IViewableData file, BlockInfoHeader rootBlockInfo)
{
using (var reader = new BinaryReader(GetBlockView(rootBlockInfo, file)))
{
return(RootIndexBlock.FromReader(reader));
}
}
private static Stream GetBlockView(BlockInfoHeader blockInfo, IViewableData file)
{
if (blockInfo.Size == 0)
{
return(null);
}
return(file.CreateView((long)blockInfo.Offset, (long)blockInfo.Size));
}
protected ArchiveFileBase(IViewableData file, ArchiveHeader header,
BlockInfoHeader[] blockInfoHeaders, RootIndexBlock rootIndex)
{
File = file;
Header = header;
BlockPointers = blockInfoHeaders;
RootIndex = rootIndex;
}
private static ArchiveHeader ReadHeader(IViewableData file)
{
var length = Marshal.SizeOf <ArchiveHeader>();
using (var stream = file.CreateView(0, length))
{
return(ArchiveHeader.ReadFrom(stream));
}
}
public IndexFile(IViewableData file, ArchiveHeader header,
BlockInfoHeader[] blockInfoHeaders, RootIndexBlock rootIndex)
: base(file, header, blockInfoHeaders, rootIndex)
{
RootFolder = new FolderEntry("", this,
new BinaryReader(GetBlockView(rootIndex.BlockIndex), Encoding.UTF8));
using (var fileStream = System.IO.File.Open(FileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
using (var sha = SHA1.Create())
{
_fileHash = sha.ComputeHash(fileStream);
}
}
/// <summary>
/// </summary>
/// <returns>Index block number</returns>
private static BlockInfoHeader[] ReadBlockPointers(
IViewableData file, ArchiveHeader header)
{
var blockPointers = new BlockInfoHeader[header.DataHeader.BlockCount];
var startPosition = header.DataHeader.BlockTableOffset;
var length = header.DataHeader.BlockCount * Marshal.SizeOf <BlockInfoHeader>();
using (var reader = new BinaryReader(file.CreateView((long)startPosition, length)))
{
for (var x = 0; x < header.DataHeader.BlockCount; x++)
{
blockPointers[x] = BlockInfoHeader.FromReader(reader);
}
}
return(blockPointers);
}
public ArchiveFile(IViewableData file, ArchiveHeader header,
BlockInfoHeader[] blockInfoHeaders, RootIndexBlock rootIndex)
: base(file, header, blockInfoHeaders, rootIndex)
{
_dataEntries = ReadDataHeaders(GetBlockReader(rootIndex.BlockIndex));
}
