public Archive(string fileName)
{
FileName = fileName;
using (System.IO.FileStream stream = System.IO.File.Open(FileName, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read))
{
CFHEADER header = CFHEADER.FromStream(stream);
int dataBlocks = 0;
for (int i = 0; i < header.CFHEADER_FIXED.cFolders; i++)
{
CFFOLDER folder = CFFOLDER.FromStream(stream, header);
m_folders.Add(folder);
dataBlocks += folder.cCFData;
}
stream.Seek(header.CFHEADER_FIXED.coffFiles, System.IO.SeekOrigin.Begin);
for (int i = 0; i < header.CFHEADER_FIXED.cFiles; i++)
{
CFFILE file = CFFILE.FromStream(stream);
m_files.Add(file);
}
stream.Close();
}
}
internal static CFFOLDER FromStream(FileStream stream, CFHEADER header)
{
CFFOLDER folder = new CFFOLDER();
BinaryReader reader = new BinaryReader(stream);
folder.coffCabStart = reader.ReadUInt32();
folder.cCFData = reader.ReadUInt16();
folder.typeCompress = reader.ReadUInt16();
if (((header.CFHEADER_FIXED.flags & CFHEADER_FLAGS.RESERVE_PRESENT) == CFHEADER_FLAGS.RESERVE_PRESENT) &&
header.CFHEADER_OPTIONAL.cbCFFolder != 0)
{
folder.abReserve = reader.ReadBytes(header.CFHEADER_OPTIONAL.cbCFFolder);
}
return(folder);
}
public virtual void ExtractFile(FileInfo fileInfo, string targetFileName, bool overwriteExisting)
{
CFFOLDER containingFolder = m_folders[fileInfo.CFFILE.iFolder];
using (System.IO.Stream input = System.IO.File.Open(FileName, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read))
{
int toRead = (int)fileInfo.CFFILE.cbFile;
CabDecompressor decompressor = new CabDecompressor((CompressionType)containingFolder.typeCompress);
CabFolderStream folderStream = new CabFolderStream(input, containingFolder.coffCabStart, containingFolder.Compressed);
// skip to the beginning of the file. this is done by decompressing into a null stream
if (fileInfo.CFFILE.uoffFolderStart > 0)
{
using (NullStream ns = new NullStream())
{
decompressor.DecompressBlock((int)fileInfo.CFFILE.uoffFolderStart, folderStream.SizeCompressed, folderStream.SizeUncompressed, folderStream, ns);
}
}
using (SizeLimitedOutputStream output = new SizeLimitedOutputStream(targetFileName, System.IO.FileMode.OpenOrCreate, (int)fileInfo.CFFILE.cbFile))
{
while (toRead > 0)
{
int nextBlock = Math.Min(toRead, folderStream.SizeUncompressed);
if (folderStream.SizeUncompressed == -1)
{
nextBlock = toRead;
}
//System.Diagnostics.Debug.WriteLine(string.Format("Reading {0} bytes", nextBlock));
decompressor.DecompressBlock(nextBlock, folderStream.SizeCompressed, folderStream.SizeUncompressed, folderStream, output);
toRead -= nextBlock;
output.Flush();
}
}
}
}
