internal override void ValidateArchive(RarVolume archive)
{
if (archive.IsMultiVolume)
{
throw new MultiVolumeExtractionException("Streamed archive is a Multi-volume archive. Use different RarReader method to extract.");
}
}
public override long Seek(long offset, SeekOrigin origin)
{
long destination = 0;
switch (origin)
{
case SeekOrigin.Begin:
destination = offset;
break;
case SeekOrigin.Current:
destination = currentPos + offset;
break;
case SeekOrigin.End:
destination = packedFileLength - 1 + offset;
break;
}
if (destination < 0L)
{
throw new ArgumentOutOfRangeException();
}
currentPos = destination;
if (currentVol == null || currentPos < currentVol.PackedFileRangeStart || currentPos > currentVol.PackedFileRangeEnd)
{
currentVol = null;
foreach (RarVolume vol in rarVolumes)
{
if (currentPos >= vol.PackedFileRangeStart && currentPos <= vol.PackedFileRangeEnd)
{
currentVol = vol;
break;
}
}
}
return(currentPos);
}
internal override void ValidateArchive(RarVolume archive)
{
}
internal abstract void ValidateArchive(RarVolume archive);
public RarStream(string rarPath)
{
bool oldNameFormat = true;
RarBlock block = null;
using (RarReader rdr = new RarReader(rarPath, RarReadMode.RAR))
while ((block = rdr.Read()) != null)
{
if (block is RarVolumeHeaderBlock && ((block.Flags & (ushort)RarVolumeHeaderBlock.FlagValues.Volume) != 0))
{
oldNameFormat = (block.Flags & (ushort)RarVolumeHeaderBlock.FlagValues.NewNumbering) == 0;
}
else if (block is RarPackedFileBlock)
{
if ((block.Flags & (ushort)RarPackedFileBlock.FlagValues.SplitBefore) != 0)
{
throw new InvalidDataException("You must start with the first volume from a RAR set");
}
break;
}
}
// this constructor implementation picks the first packed file encountered in the archive and sets up to read it
// an alternate constructor might have a parameter to specify the packed file to read.
string packedFileName = null;
string nextFileName = rarPath;
while (File.Exists(nextFileName))
{
using (RarReader rdr = new RarReader(nextFileName, RarReadMode.RAR))
while ((block = rdr.Read()) != null)
{
RarPackedFileBlock fblock = block as RarPackedFileBlock;
if (fblock != null)
{
if (string.IsNullOrEmpty(packedFileName))
{
packedFileName = fblock.FileName;
}
if (packedFileName == fblock.FileName)
{
if (fblock.CompressionMethod != 0x30)
{
throw new InvalidDataException("Compressed RARs are not supported");
}
currentVol = new RarVolume();
currentVol.FilePath = nextFileName;
currentVol.PackedFileRangeStart = packedFileLength;
currentVol.PackedFileRangeEnd = packedFileLength + (long)fblock.PackedSize - 1;
currentVol.PackedFileOffset = fblock.BlockPosition + fblock.RawData.LongLength;
rarVolumes.Add(currentVol);
packedFileLength += (long)fblock.PackedSize;
}
}
}
nextFileName = RarFileNameFinder.FindNextFileName(nextFileName, oldNameFormat);
}
currentVol = rarVolumes[0];
}
