| public deflateInit ( int level ) : int | ||
| level | int | An integer value from 0 to 9 indicating the desired compression level. |
| return | int | |
private static zlib.ZStream CreateDeflateStream(int level, int windowBits, int memLevel, int strategy)
{
var stream = new zlib.ZStream();
int result = stream.deflateInit(level, windowBits, memLevel, (zlib.CompressionStrategy)strategy);
if (result != Z_OK)
{
throw MakeError(result, null);
}
return(stream);
}
internal Compress(int level, int method, int wbits, int memlevel, int strategy)
{
zst = new ZStream();
int err = zst.deflateInit(level, wbits);
switch(err)
{
case ZlibModule.Z_OK:
break;
case ZlibModule.Z_STREAM_ERROR:
throw PythonOps.ValueError("Invalid initialization option");
default:
throw ZlibModule.zlib_error(this.zst, err, "while creating compression object");
}
}
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");
}
/// <summary>
/// Constructor which takes two parameters: the <paramref name="stream"/> to store compressed data in and the desired compression level.
/// </summary>
/// <param name="stream">A stream to be used to store compressed data.</param>
/// <param name="level">An integer value indicating the desired compression level. The compression level can take values from 0 to 9. The maximum value indicates that the maximum compression should be achieved (but this method will be the slowest one). 0 means that no compression should be used at all. If you want to use the default compression level you can pass -1. Also you can use the constants from the <see cref="ZLibCompressionLevel" /> class.</param>
public ZOutputStream(System.IO.Stream stream, int level)
{
InitBlock();
this._stream = stream;
z.deflateInit(level);
}
private static zlib.ZStream CreateDeflateStream(int level, int windowBits, int memLevel, int strategy) {
var stream = new zlib.ZStream();
int result = stream.deflateInit(level, windowBits, memLevel, (zlib.CompressionStrategy)strategy);
if (result != Z_OK) {
throw MakeError(result, null);
}
return stream;
}
