/// <summary>
/// Reimplements function from zlib (uncompress) 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>
/// <returns>Zlib status code.</returns>
private static int ZlibUncompress(ref byte[] dest, byte[] source)
{
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.inflateInit();
if (err != zlibConst.Z_OK) return err;
err = stream.inflate(zlibConst.Z_FINISH);
if (err != zlibConst.Z_STREAM_END)
{
stream.inflateEnd();
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.inflateEnd();
}
public override void Write(System.Byte[] b1, int off, int len)
{
if (len == 0)
{
return;
}
int err;
byte[] b = new byte[b1.Length];
System.Array.Copy(b1, b, b1.Length);
z.next_in = b;
z.next_in_index = off;
z.avail_in = len;
do
{
z.next_out = buf;
z.next_out_index = 0;
z.avail_out = bufsize;
if (compress)
{
err = z.deflate(flush_Renamed_Field);
}
else
{
err = z.inflate(flush_Renamed_Field);
}
if (err != zlibConst.Z_OK)
{
throw new ZStreamException((compress?"de":"in") + "flating: " + z.msg);
}
out_Renamed.Write(buf, 0, bufsize - z.avail_out);
}while (z.avail_in > 0 || z.avail_out == 0);
}
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);
}
protected override int PerformZlibOperation(ZStream zs, int flush)
{
return zs.inflate(flush);
}
private byte[] inflate_file(BinaryReader reader, long length)
{
byte[] uncompressed = new byte[length*16];
ZStream strm = new ZStream();
strm.next_in = reader.ReadBytes((int)length);
strm.avail_in = (int)length;
strm.avail_out = 0;
var code = strm.inflateInit(-15);
var output = new System.Collections.Generic.List<byte>();
while (code == zlibConst.Z_OK && strm.avail_out == 0)
{
strm.next_out = uncompressed;
strm.avail_out = uncompressed.Length;
code = strm.inflate(zlibConst.Z_SYNC_FLUSH);
switch (code)
{
case zlibConst.Z_OK:
for (int i = 0; i < uncompressed.Length; i++)
output.Add(uncompressed[i]);
break;
case zlibConst.Z_STREAM_END:
for (int i = 0; i < uncompressed.Length - strm.avail_out; i++)
output.Add(uncompressed[i]);
break;
}
}
return output.ToArray();
}
public static PhpBytes GzInflate(PhpBytes data, long length)
{
uint factor=1, maxfactor=16;
long ilength;
ZStream zs = new ZStream();
zs.avail_in = data.Length;
zs.next_in = data.ReadonlyData;
zs.total_out = 0;
// -15 omits the header (undocumented feature of zlib)
int status = zs.inflateInit(-15);
if (status != zlibConst.Z_OK)
{
PhpException.Throw(PhpError.Warning, zError(status));
return null;
}
do
{
ilength = length != 0 ? length : data.Length * (1 << (int)(factor++));
try
{
byte[] newOutput = new byte[ilength];
if (zs.next_out != null)
{
Buffer.BlockCopy(zs.next_out, 0, newOutput, 0, zs.next_out.Length);
}
zs.next_out = newOutput;
}
catch (OutOfMemoryException)
{
zs.inflateEnd();
return null;
}
zs.next_out_index = (int)zs.total_out;
zs.avail_out = unchecked((int)(ilength - zs.total_out));
status = zs.inflate(zlibConst.Z_NO_FLUSH);
}
while ((status == zlibConst.Z_BUF_ERROR || (status == zlibConst.Z_OK && (zs.avail_in != 0 || zs.avail_out == 0))) && length == 0 && factor < maxfactor);
zs.inflateEnd();
if ((length != 0 && status == zlibConst.Z_OK) || factor >= maxfactor)
{
status = zlibConst.Z_MEM_ERROR;
}
if (status == zlibConst.Z_STREAM_END || 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;
}
}
private void Decompress(byte[] deflated, int deflatedLen, byte[] inflated, int inflatedLen)
{
ZStream stream = new ZStream();
stream.next_in = deflated;
stream.avail_in = deflatedLen;
stream.next_out = inflated;
stream.avail_out = inflatedLen;
stream.inflateInit();
stream.inflate(zlibConst.Z_NO_FLUSH);
stream.inflateEnd();
}
