public static byte[] BCGZipDecompress(BufLen buf)
{
var reader = new BufRefLen(buf);
using (var ms = new MemoryStream())
{
// Skip gzip header
var gzheader = reader.ReadBufLen(10);
var flag = gzheader.Peek8(3);
if ((flag & 0x04) != 0)
{
reader.Seek(reader.Read16()); // "Extra"
}
if ((flag & 0x08) != 0)
{
while (reader.Read8() != 0)
{
; // "Name"
}
}
if ((flag & 0x10) != 0)
{
while (reader.Read8() != 0)
{
; // "Comment"
}
}
if ((flag & 0x02) != 0)
{
reader.Read16(); // "CRC16"
}
ms.Write(reader.BaseArray, reader.BaseArrayOffset, reader.Length);
ms.Position = 0;
using (var gzs = new ZInputStream(ms, true))
{
var gzdata = StreamUtils.Read(gzs);
return(gzdata);
}
}
}
public static BufLen BCGZipDecompressNew(BufLen buf)
{
var reader = new BufRefLen(buf);
// Skip gzip header
var gzheader = reader.ReadBufLen(10);
var flag = gzheader.Peek8(3);
if ((flag & 0x04) != 0)
{
reader.Seek(reader.Read16()); // "Extra"
}
if ((flag & 0x08) != 0)
{
while (reader.Read8() != 0)
{
; // "Name"
}
}
if ((flag & 0x10) != 0)
{
while (reader.Read8() != 0)
{
; // "Comment"
}
}
if ((flag & 0x02) != 0)
{
reader.Read16(); // "CRC16"
}
var z = new ZStream();
z.inflateInit(true);
var dest = new byte[buf.Length * 2];
var destix = 0;
z.next_in_index = reader.BaseArrayOffset;
z.next_in = reader.BaseArray;
z.avail_in = reader.Length - 8;
bigger_dest:
z.next_out = dest;
z.next_out_index = destix;
z.avail_out = dest.Length - destix;
var err = z.inflate(JZlib.Z_FINISH);
if (err != JZlib.Z_BUF_ERROR && err != JZlib.Z_OK && err != JZlib.Z_STREAM_END)
{
throw new IOException("inflating: " + 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;
}
var result = new BufLen(dest, 0, dest.Length - z.avail_out);
z.inflateEnd();
return(result);
}