private bool _ExtractTo( int index, Stream output, int outBufRemain )
{
XUnzipFileInfo fileInfo = _GetFileInfo ( index );
BinaryReader br = new BinaryReader ( inputStream );
if ( fileInfo.offsetData == -1 )
{
if ( inputStream.Seek ( fileInfo.offsetLocalHeader, SeekOrigin.Begin ) != fileInfo.offsetLocalHeader )
throw new Exception ( XUNZIP_ERR.CANT_READ_FILE.ToString () );
if ( !ReadLocalHeader ( ref fileInfo, br ) )
return false;
}
inputStream.Seek ( fileInfo.offsetData, SeekOrigin.Begin );
byte [] bufIn;
int inputRemain;
int outputRemain;
int toRead;
uint crc32 = 0;
bufIn = new byte [ 32768 ];
inputRemain = fileInfo.compressedSize;
outputRemain = fileInfo.uncompressedSize;
if ( fileInfo.method == XUNZIP_COMPRESSION_METHOD.METHOD_STORE )
{
CRC32 crcGen = new CRC32 ();
while ( inputRemain > 0 )
{
toRead = System.Math.Min ( System.Math.Min ( 32768, inputRemain ), outputRemain );
int temp = br.Read ( bufIn, 0, toRead );
output.Write ( bufIn, 0, toRead );
crcGen.Update ( bufIn, 0, toRead );
crc32 = crcGen.Result;
inputRemain -= toRead;
outputRemain -= temp;
}
}
else
{
DeflateStream stream = new DeflateStream ( inputStream, CompressionMode.Decompress );
CRC32 crcGen = new CRC32 ();
while ( inputRemain > 0 )
{
toRead = System.Math.Min ( System.Math.Min ( 32768, inputRemain ), outputRemain );
int temp = stream.Read ( bufIn, 0, outputRemain );
output.Write ( bufIn, 0, temp );
crcGen.Update ( bufIn, 0, toRead );
crc32 = crcGen.Result;
inputRemain -= toRead;
outputRemain -= temp;
}
}
//if ( crc32 != fileInfo.crc32 )
//return false;
if ( outputRemain > 0 )
return false;
output.Position = 0;
return true;
}
private void initStream()
{
if ( deflateStream != null ) return;
CompressionLevel clevel = CompressionLevel.BestCompression;
if ( compressLevel >= 1 && compressLevel <= 5 ) clevel = CompressionLevel.BestSpeed;
else if ( compressLevel == 0 ) clevel = CompressionLevel.None;
deflateStream = new DeflateStream ( rawStream, CompressionMode.Compress, clevel, true );
}
public static String UncompressString( byte [] compressed )
{
using ( var input = new System.IO.MemoryStream ( compressed ) )
{
Stream decompressor =
new DeflateStream ( input, CompressionMode.Decompress );
return ZlibBaseStream.UncompressString ( compressed, decompressor );
}
}
public static byte[] CompressString( string s )
{
using ( var ms = new MemoryStream () )
{
Stream compressor =
new DeflateStream ( ms, CompressionMode.Compress, CompressionLevel.BestCompression );
ZlibBaseStream.CompressString ( s, compressor );
return ms.ToArray ();
}
}
public static byte[] CompressBuffer( byte [] b )
{
using ( var ms = new System.IO.MemoryStream () )
{
Stream compressor =
new DeflateStream ( ms, CompressionMode.Compress, CompressionLevel.BestCompression );
ZlibBaseStream.CompressBuffer ( b, compressor );
return ms.ToArray ();
}
}
private void initStream()
{
if ( deflateStream != null ) return;
deflateStream = new DeflateStream ( rawStream, CompressionMode.Decompress, true );
}
