public JZlibEncoder(int compressionLevel, int windowBits, int memLevel, byte[] dictionary)
{
Contract.Requires(compressionLevel >= 0 && compressionLevel <= 9);
Contract.Requires(windowBits >= 9 && windowBits <= 15);
Contract.Requires(memLevel >= 1 && memLevel <= 9);
int resultCode = this.z.DeflateInit(
compressionLevel, windowBits, memLevel,
JZlib.W_ZLIB); // Default: ZLIB format
if (resultCode != JZlib.Z_OK)
{
ZlibUtil.Fail(this.z, "initialization failure", resultCode);
}
else
{
resultCode = this.z.DeflateSetDictionary(dictionary, dictionary.Length);
if (resultCode != JZlib.Z_OK)
{
ZlibUtil.Fail(this.z, "failed to set the dictionary", resultCode);
}
}
this.wrapperOverhead = ZlibUtil.WrapperOverhead(ZlibWrapper.Zlib);
}
/**
* Creates a new zlib encoder with the specified {@code compressionLevel},
* the specified {@code windowBits}, the specified {@code memLevel}, and
* the specified wrapper.
*
* @param compressionLevel
* {@code 1} yields the fastest compression and {@code 9} yields the
* best compression. {@code 0} means no compression. The default
* compression level is {@code 6}.
* @param windowBits
* The base two logarithm of the size of the history buffer. The
* value should be in the range {@code 9} to {@code 15} inclusive.
* Larger values result in better compression at the expense of
* memory usage. The default value is {@code 15}.
* @param memLevel
* How much memory should be allocated for the internal compression
* state. {@code 1} uses minimum memory and {@code 9} uses maximum
* memory. Larger values result in better and faster compression
* at the expense of memory usage. The default value is {@code 8}
*
* @throws CompressionException if failed to initialize zlib
*/
public JZlibEncoder(ZlibWrapper wrapper, int compressionLevel, int windowBits, int memLevel)
{
Contract.Requires(compressionLevel >= 0 && compressionLevel <= 9);
Contract.Requires(windowBits >= 9 && windowBits <= 15);
Contract.Requires(memLevel >= 1 && memLevel <= 9);
int resultCode = this.z.Init(
compressionLevel, windowBits, memLevel,
ZlibUtil.ConvertWrapperType(wrapper));
if (resultCode != JZlib.Z_OK)
{
ZlibUtil.Fail(this.z, "initialization failure", resultCode);
}
this.wrapperOverhead = ZlibUtil.WrapperOverhead(wrapper);
}