// Extract a file from our archive
public void ExtractFile(TARMetaData entry, string output)
{
// Check we're extracting a normal file
if (entry.GetTypeFlags() == TARMetaData.TypeFlags.NormalFile)
{
//Create any directories as required
string directory = Path.GetDirectoryName(output);
if (!string.IsNullOrEmpty(directory) && !Directory.Exists(directory))
{
Directory.CreateDirectory(directory);
}
{
// Open relevant streams and extract
using (var stream = File.OpenRead(Filename))
if (isCompressed)
{
using (var gzip = new GZipStream(stream, CompressionMode.Decompress))
ExtractFile(entry, gzip, output);
}
else
{
ExtractFile(entry, stream, output);
}
}
}
}
// Load a TAR archive from a Stream
private void LoadFromStream(Stream stream)
{
// TAR Entry MetaData is stored in 512 byte buffers
var metaDataBuffer = new byte[512];
int readCount = 0;
long bufferPosition = 0;
do
{
// Read 512 bytes
readCount = stream.Read(metaDataBuffer, 0, 512);
// If we were successful
if (readCount >= 512)
{
// Unpack the MetaData and update the buffer positions
TARMetaData fileMetaData = new TARMetaData(metaDataBuffer);
fileMetaData.MetaDataBufferPositionStart = bufferPosition;
bufferPosition += readCount;
fileMetaData.FileBufferPositionStart = bufferPosition;
// If the entry has file data following it
if (fileMetaData.GetTypeFlags() == TARMetaData.TypeFlags.NormalFile ||
fileMetaData.GetTypeFlags() == TARMetaData.TypeFlags.ExtendedHeaderWithMetaDataForNextFileInArchive)
{
// Seek past the data
StreamSeek(stream, fileMetaData.fileSize);
bufferPosition += fileMetaData.fileSize;
// Make sure we seek past by a multiple of 512
if (fileMetaData.fileSize % 512 > 0)
{
long offset = 512 - (fileMetaData.fileSize % 512);
StreamSeek(stream, offset);
bufferPosition += offset;
}
}
// Store the meta data
Entries.Add(fileMetaData);
}
//Loop until we've run out of entries
} while (readCount >= 512);
}