public static byte[] BCGZipCompress(byte[] buf)
{
using (var ms = new MemoryStream())
{
ms.WriteByte(0x1f);
ms.WriteByte(0x8b);
ms.WriteByte(0x08);
ms.WriteByte(0x00);
ms.WriteByte(0x00);
ms.WriteByte(0x00);
ms.WriteByte(0x00);
ms.WriteByte(0x00);
ms.WriteByte(0x02);
ms.WriteByte(0xFF);
using (var gzs = new ZOutputStream(ms, 6, true))
{
gzs.Write(buf, 0, buf.Length);
gzs.Flush();
}
var crc = LZUtils.CRC32(buf);
// ZOutputStream closes the outer stream...
using (var ms2 = new MemoryStream())
{
StreamUtils.Write(ms2, ms.ToArray());
StreamUtils.WriteUInt32(ms2, crc);
StreamUtils.WriteInt32(ms2, buf.Length);
var msb = ms2.ToArray();
/*
* using ( var foos = new FileStream( "test.gz", FileMode.Create, FileAccess.Write ) )
* {
* foos.Write( msb );
* }
*/
return(msb);
}
}
}
public static BufLen BCGZipCompressNew(BufLen buf)
{
var crc = LZUtils.CRC32(buf);
var dest = new byte[buf.Length + 4096];
var destix = 0;
dest[destix++] = 0x1f;
dest[destix++] = 0x8b;
dest[destix++] = 0x08;
dest[destix++] = 0x00;
dest[destix++] = 0x00;
dest[destix++] = 0x00;
dest[destix++] = 0x00;
dest[destix++] = 0x00;
dest[destix++] = 0x02;
dest[destix++] = 0xFF;
var z = new ZStream();
z.deflateInit(6, true);
z.next_in_index = buf.BaseArrayOffset;
z.next_in = buf.BaseArray;
z.avail_in = buf.Length;
bigger_dest:
z.next_out = dest;
z.next_out_index = destix;
z.avail_out = dest.Length - destix;
var err = z.deflate(JZlib.Z_FINISH);
if (err != JZlib.Z_OK && err != JZlib.Z_STREAM_END)
{
throw new IOException("deflating: " + z.msg);
}
if (z.avail_out == 0)
{
var newdest = new byte[dest.Length * 2];
Array.Copy(dest, newdest, dest.Length);
destix = dest.Length;
dest = newdest;
goto bigger_dest;
}
if (z.avail_out < 8)
{
var newdest = new byte[dest.Length + 8];
Array.Copy(dest, newdest, dest.Length);
destix = dest.Length;
dest = newdest;
goto bigger_dest;
}
var result = new BufLen(dest, 0, 10 + dest.Length - z.avail_out + 8);
result.Poke32(crc, result.Length - 8);
result.Poke32((uint)buf.Length, result.Length - 4);
z.deflateEnd();
/*
* using ( var foos = new FileStream( "test.gz", FileMode.Create, FileAccess.Write ) )
* {
* foos.Write( msb );
* }
*/
return(result);
}
