// Do we really need these? SWGEmu doesn't seem to compress...
public void Compress()
{
byte[] numArray = new byte[this.data.Count];
this.data.CopyTo(0, numArray, 0, this.data.Count);
byte[] numArray1 = new byte[800];
ZStream zStream = new ZStream()
{
avail_in = 0
};
zStream.deflateInit(6);
zStream.next_in = numArray;
zStream.next_in_index = 2;
zStream.avail_in = (int)numArray.Length - 4;
zStream.next_out = numArray1;
zStream.avail_out = 800;
if (zStream.deflate(4) != -3)
{
long totalOut = zStream.total_out;
zStream.deflateEnd();
zStream = null;
this.data.Clear();
this.data.Add(numArray[0]);
this.data.Add(numArray[1]);
for (int i = 0; (long)i < totalOut; i++)
{
this.data.Add(numArray1[i]);
}
this.data.Add(numArray[(int)numArray.Length - 3]);
this.data.Add(numArray[(int)numArray.Length - 2]);
this.data.Add(numArray[(int)numArray.Length - 1]);
}
}
public ZOutputStream(System.IO.Stream out_Renamed, int level) : base()
{
InitBlock();
this.out_Renamed = out_Renamed;
z.deflateInit(level);
compress = true;
}
public ZInputStream(Stream in_Renamed, int level) : base(in_Renamed)
{
InitBlock();
this.in_Renamed = in_Renamed;
z.deflateInit(level);
compress = true;
z.next_in = buf;
z.next_in_index = 0;
z.avail_in = 0;
}
protected override int InitZlibOperation(ZStream zs)
{
// -MAX_WBITS stands for absense of Zlib header and trailer (needed for GZIP compression and decompression)
return zs.deflateInit(_level, -Zlib.MAX_WBITS);
}
private void init(Stream innerStream)
{
m_stream = innerStream;
if (m_stream.CanRead)
{
m_in = new ZStream();
int ret = m_in.inflateInit();
if (ret != zlibConst.Z_OK)
throw new CompressionFailedException("Unable to initialize zlib for deflate: " + ret);
m_inbuf = new byte[bufsize];
m_in.avail_in = 0;
m_in.next_in = m_inbuf;
m_in.next_in_index = 0;
}
if (m_stream.CanWrite)
{
m_out = new ZStream();
int ret = m_out.deflateInit(zlibConst.Z_DEFAULT_COMPRESSION);
if (ret != zlibConst.Z_OK)
throw new CompressionFailedException("Unable to initialize zlib for inflate: " + ret);
m_outbuf = new byte[bufsize];
m_out.next_out = m_outbuf;
}
}
public static PhpBytes GzEncode(PhpBytes data, int level, int encoding_mode)
{
if ((level < -1) || (level > 9))
{
PhpException.Throw(PhpError.Warning, String.Format("compression level ({0}) must be within -1..9", level));
return null;
}
ZStream zs = new ZStream();
int status = zlibConst.Z_OK;
zs.next_in = data.ReadonlyData;
zs.avail_in = data.Length;
// heuristic for max data length
zs.avail_out = data.Length + data.Length / Zlib.PHP_ZLIB_MODIFIER + 15 + 1;
zs.next_out = new byte[zs.avail_out];
switch (encoding_mode)
{
case (int)ForceConstants.FORCE_GZIP:
if ((status = zs.deflateInit(level, -MAX_WBITS)) != zlibConst.Z_OK)
{
PhpException.Throw(PhpError.Warning, zError(status));
return null;
}
break;
case (int)ForceConstants.FORCE_DEFLATE:
if ((status = zs.deflateInit(level)) != zlibConst.Z_OK)
{
PhpException.Throw(PhpError.Warning, zError(status));
return null;
}
break;
}
status = zs.deflate(zlibConst.Z_FINISH);
if (status != zlibConst.Z_STREAM_END)
{
zs.deflateEnd();
if (status == zlibConst.Z_OK)
{
status = zlibConst.Z_STREAM_ERROR;
}
}
else
{
status = zs.deflateEnd();
}
if (status == zlibConst.Z_OK)
{
long output_length = zs.total_out + (encoding_mode == (int)ForceConstants.FORCE_GZIP ? GZIP_HEADER_LENGTH + GZIP_FOOTER_LENGTH : GZIP_HEADER_LENGTH);
long output_offset = GZIP_HEADER_LENGTH;
byte[] output = new byte[output_length];
Buffer.BlockCopy(zs.next_out, 0, output, (int)output_offset, (int)zs.total_out);
// fill the header
output[0] = GZIP_HEADER[0];
output[1] = GZIP_HEADER[1];
output[2] = Z_DEFLATED; // zlib constant (private in ZLIB.NET)
output[3] = 0; // reserved flag bits (this function puts invalid flags in here)
// 4-8 represent time and are set to zero
output[9] = OS_CODE; // php constant
if (encoding_mode == (int)ForceConstants.FORCE_GZIP)
{
var crc_algo = new PHP.Library.CRC32();
byte[] crc = crc_algo.ComputeHash(data.ReadonlyData, 0, data.Length);
crc_algo.Dispose();
output[output_length - 8] = crc[0];
output[output_length - 7] = crc[1];
output[output_length - 6] = crc[2];
output[output_length - 5] = crc[3];
output[output_length - 4] = (byte)(zs.total_in & 0xFF);
output[output_length - 3] = (byte)((zs.total_in >> 8) & 0xFF);
output[output_length - 2] = (byte)((zs.total_in >> 16) & 0xFF);
output[output_length - 1] = (byte)((zs.total_in >> 24) & 0xFF);
}
return new PhpBytes(output);
}
else
{
PhpException.Throw(PhpError.Warning, zError(status));
return null;
}
}
public static PhpBytes GzDeflate(PhpBytes data, int level)
{
if ((level < -1) || (level > 9))
{
PhpException.Throw(PhpError.Warning, String.Format("compression level ({0}) must be within -1..9", level));
return null;
}
ZStream zs = new ZStream();
zs.next_in = data.ReadonlyData;
zs.avail_in = data.Length;
// heuristic for max data length
zs.avail_out = data.Length + data.Length / PHP_ZLIB_MODIFIER + 15 + 1;
zs.next_out = new byte[zs.avail_out];
// -15 omits the header (undocumented feature of zlib)
int status = zs.deflateInit(level, -MAX_WBITS);
if (status == zlibConst.Z_OK)
{
status = zs.deflate(zlibConst.Z_FINISH);
if (status != zlibConst.Z_STREAM_END)
{
zs.deflateEnd();
if (status == zlibConst.Z_OK)
{
status = zlibConst.Z_BUF_ERROR;
}
}
else
{
status = zs.deflateEnd();
}
}
if (status == zlibConst.Z_OK)
{
byte[] result = new byte[zs.total_out];
Buffer.BlockCopy(zs.next_out, 0, result, 0, (int)zs.total_out);
return new PhpBytes(result);
}
else
{
PhpException.Throw(PhpError.Warning, zError(status));
return null;
}
}
/// <summary>
/// Reimplements function from zlib (compress2) that is not present in ZLIB.NET.
/// </summary>
/// <param name="dest">Destination array of bytes. May be trimmed if necessary.</param>
/// <param name="source">Source array of bytes.</param>
/// <param name="level">Level of compression.</param>
/// <returns>Zlib status code.</returns>
private static int ZlibCompress(ref byte[] dest, byte[] source, int level)
{
ZStream stream = new ZStream();
int err;
stream.next_in = source;
stream.avail_in = source.Length;
stream.next_out = dest;
stream.avail_out = dest.Length;
err = stream.deflateInit(level);
if (err != zlibConst.Z_OK) return err;
err = stream.deflate(zlibConst.Z_FINISH);
if (err != zlibConst.Z_STREAM_END)
{
stream.deflateEnd();
return err == zlibConst.Z_OK ? zlibConst.Z_BUF_ERROR : err;
}
if (stream.total_out != dest.Length)
{
byte[] output = new byte[stream.total_out];
Buffer.BlockCopy(stream.next_out, 0, output, 0, (int)stream.total_out);
dest = output;
}
return stream.deflateEnd();
}
