/// <summary>
/// Processes a data block in a JPA file located in the current file position
/// </summary>
/// <param name="dataBlockHeader">The header of the block being processed</param>
/// <param name="token">A cancellation token, allowing the called to cancel the processing</param>
public void ProcessDataBlock(ZipLocalFileHeader dataBlockHeader, CancellationToken token)
{
// Get the compression type
TCompressionType CompressionType = TCompressionType.Uncompressed;
switch (dataBlockHeader.CompressionMethod)
{
case 0:
CompressionType = TCompressionType.Uncompressed;
break;
case 8:
CompressionType = TCompressionType.GZip;
break;
case 12:
CompressionType = TCompressionType.BZip2;
break;
default:
throw new InvalidArchiveException(Language.ResourceManager.GetString("ERR_FORMAT_INVALID_COMPRESSION_METHOD"));
}
// Decide on the file type
TEntityType EntityType = TEntityType.File;
if (dataBlockHeader.Filename.EndsWith("/"))
{
EntityType = TEntityType.Directory;
}
else if (dataBlockHeader.VersionToExtract == BitConverter.ToUInt16(new byte[] { 0x10, 0x03 }, 0))
{
EntityType = TEntityType.Symlink;
}
// Process the data block
ProcessDataBlock(dataBlockHeader.CompressedSize, dataBlockHeader.UncompressedSize, CompressionType,
EntityType, dataBlockHeader.Filename, token);
}
protected void ProcessDataBlock(ulong CompressedSize, ulong UncompressedSize, TCompressionType CompressionType, TEntityType EntityType, string EntityPath, CancellationToken token)
{
// Update the archive's progress record
Progress.FilePosition = (ulong)(SizesOfPartsAlreadyRead + InputStream.Position);
Progress.RunningCompressed += CompressedSize;
Progress.RunningUncompressed += UncompressedSize;
Progress.Status = ExtractionStatus.Running;
// Create the event arguments we'll use when invoking the event
ProgressEventArgs args = new ProgressEventArgs(Progress);
// If we don't have a data writer we just need to skip over the data
if (DataWriter == null)
{
if (CompressedSize > 0)
{
SkipBytes((long)CompressedSize);
Progress.FilePosition += CompressedSize;
}
return;
}
// Is this a directory?
switch (EntityType)
{
case TEntityType.Directory:
DataWriter.MakeDirRecursive(DataWriter.GetAbsoluteFilePath(EntityPath));
return;
case TEntityType.Symlink:
if (CompressedSize > 0)
{
string strTarget = ReadUtf8String((int)CompressedSize);
DataWriter.MakeSymlink(strTarget, DataWriter.GetAbsoluteFilePath(EntityPath));
}
return;
}
// Begin writing to file
DataWriter.StartFile(EntityPath);
// Is this a zero length file?
if (CompressedSize == 0)
{
DataWriter.StopFile();
return;
}
switch (CompressionType)
{
case TCompressionType.Uncompressed:
ProcessUncompressedDataBlock(CompressedSize, token);
break;
case TCompressionType.GZip:
ProcessGZipDataBlock(CompressedSize, token);
break;
case TCompressionType.BZip2:
ProcessBZip2DataBlock(CompressedSize, token);
break;
}
// Stop writing data to the file
DataWriter.StopFile();
Progress.FilePosition += CompressedSize;
}