internal static int Process(zlib.ZStream /*!*/ zst, MutableString str, zlib.FlushStrategy flush, bool compress,
out MutableString /*!*/ result, ref MutableString trailingUncompressedData)
{
result = MutableString.CreateBinary();
// add previously compressed data to the output:
if (zst.next_out != null)
{
result.Append(zst.next_out, 0, zst.next_out_index);
}
int err;
int bufferStart = zst.next_out_index;
err = Process(zst, str, flush, compress, ref trailingUncompressedData);
result.Append(zst.next_out, bufferStart, zst.next_out_index - bufferStart);
if (err == Z_STREAM_END && (flush == zlib.FlushStrategy.Z_FINISH || str == null))
{
err = compress ? zst.deflateEnd() : zst.inflateEnd();
}
zst.next_out = null;
zst.next_out_index = 0;
zst.avail_out = 0;
return(err);
}
/// <summary>
/// Frees allocated resources.
/// </summary>
public void End()
{
z.deflateEnd();
z.free();
z = null;
}
public static string compress([BytesConversion]IList<byte> data,
[DefaultParameterValue(Z_DEFAULT_COMPRESSION)]int level)
{
byte[] input = data.ToArray();
byte[] output = new byte[input.Length + input.Length / 1000 + 12 + 1];
ZStream zst = new ZStream();
zst.next_in = input;
zst.avail_in = input.Length;
zst.next_out = output;
zst.avail_out = output.Length;
int err = zst.deflateInit(level);
switch(err)
{
case (Z_OK):
break;
case (Z_STREAM_ERROR):
throw PythonOps.CreateThrowable(error,
"Bad compression level");
default:
zst.deflateEnd();
zlib_error(zst, err, "while compressing data");
return null;
}
err = zst.deflate(FlushStrategy.Z_FINISH);
if(err != Z_STREAM_END)
{
zst.deflateEnd();
throw zlib_error(zst, err, "while compressing data");
}
err = zst.deflateEnd();
if(err == Z_OK)
return PythonAsciiEncoding.Instance.GetString(output, 0, (int)zst.total_out);
else
throw zlib_error(zst, err, "while finishing compression");
}
