internal int deflateParams(ZStream strm, int _level, int _strategy)
{
int result = 0;
if (_level == -1)
{
_level = 6;
}
if (_level < 0 || _level > 9 || _strategy < 0 || _strategy > 2)
{
return(-2);
}
if (Deflate.config_table[this.level].func != Deflate.config_table[_level].func && strm.total_in != 0L)
{
result = strm.deflate(1);
}
if (this.level != _level)
{
this.level = _level;
this.max_lazy_match = Deflate.config_table[this.level].max_lazy;
this.good_match = Deflate.config_table[this.level].good_length;
this.nice_match = Deflate.config_table[this.level].nice_length;
this.max_chain_length = Deflate.config_table[this.level].max_chain;
}
this.strategy = _strategy;
return(result);
}
internal int deflateParams(ZStream strm, int _level, int _strategy)
{
int num1 = 0;
if (_level == -1)
{
_level = 6;
}
if (((_level < 0) || (_level > 9)) || ((_strategy < 0) || (_strategy > 2)))
{
return(-2);
}
if ((Deflate.config_table[this.level].func != Deflate.config_table[_level].func) && (strm.total_in != 0))
{
num1 = strm.deflate(1);
}
if (this.level != _level)
{
this.level = _level;
this.max_lazy_match = Deflate.config_table[this.level].max_lazy;
this.good_match = Deflate.config_table[this.level].good_length;
this.nice_match = Deflate.config_table[this.level].nice_length;
this.max_chain_length = Deflate.config_table[this.level].max_chain;
}
this.strategy = _strategy;
return(num1);
}
public int read(byte[] b, int off, int len)
{
if (len == 0)
{
return(0);
}
int err;
z.next_out = b;
z.next_out_index = off;
z.avail_out = len;
do
{
if ((z.avail_in == 0) && (!nomoreinput))
{
// if buffer is empty and more input is avaiable, refill it
z.next_in_index = 0;
z.avail_in = SupportClass.ReadInput(in_Renamed, buf, 0, bufsize); //(bufsize<z.avail_out ? bufsize : z.avail_out));
if (z.avail_in == -1)
{
z.avail_in = 0;
nomoreinput = true;
}
}
if (compress)
{
err = z.deflate(flush);
}
else
{
err = z.inflate(flush);
}
if (nomoreinput && (err == zlibConst.Z_BUF_ERROR))
{
return(-1);
}
if (err != zlibConst.Z_OK && err != zlibConst.Z_STREAM_END)
{
throw new ZStreamException((compress?"de":"in") + "flating: " + z.msg);
}
if (nomoreinput && (z.avail_out == len))
{
return(-1);
}
}while (z.avail_out == len && err == zlibConst.Z_OK);
//System.err.print("("+(len-z.avail_out)+")");
return(len - z.avail_out);
}
internal int deflateParams(ZStream strm, int _level, int _strategy)
{
int err = Z_OK;
if (_level == Z_DEFAULT_COMPRESSION)
{
_level = 6;
}
if (_level < 0 || _level > 9 || _strategy < 0 || _strategy > Z_HUFFMAN_ONLY)
{
return Z_STREAM_ERROR;
}
if (config_table[level].func != config_table[_level].func && strm.total_in != 0)
{
// Flush the last buffer:
err = strm.deflate(Z_PARTIAL_FLUSH);
}
if (level != _level)
{
level = _level;
max_lazy_match = config_table[level].max_lazy;
good_match = config_table[level].good_length;
nice_match = config_table[level].nice_length;
max_chain_length = config_table[level].max_chain;
}
strategy = _strategy;
return err;
}
internal int deflateParams(ZStream strm, int _level, int _strategy)
{
int num1 = 0;
if (_level == -1)
{
_level = 6;
}
if (((_level < 0) || (_level > 9)) || ((_strategy < 0) || (_strategy > 2)))
{
return -2;
}
if ((Deflate.config_table[this.level].func != Deflate.config_table[_level].func) && (strm.total_in != 0))
{
num1 = strm.deflate(1);
}
if (this.level != _level)
{
this.level = _level;
this.max_lazy_match = Deflate.config_table[this.level].max_lazy;
this.good_match = Deflate.config_table[this.level].good_length;
this.nice_match = Deflate.config_table[this.level].nice_length;
this.max_chain_length = Deflate.config_table[this.level].max_chain;
}
this.strategy = _strategy;
return num1;
}
protected override int PerformZlibOperation(ZStream zs, int flush)
{
return zs.deflate(flush);
}
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();
}
z_error = zs.msg;
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();
}