ZLibEncoder class

The ZLibEncoder encoder is used by ZLibCodec and GZipCodec to compress data.



ZLibEncoder({bool gzip: false, int level: ZLibOption.defaultLevel, int windowBits: ZLibOption.defaultWindowBits, int memLevel: ZLibOption.defaultMemLevel, int strategy: ZLibOption.strategyDefault, List<int> dictionary: null, bool raw: false })


dictionary List<int>
Initial compression dictionary. [...]
gzip bool
When true, GZip frames will be added to the compressed data.
level int
The compression-level can be set in the range of -1..9, with 6 being the default compression level. Levels above 6 will have higher compression rates at the cost of more CPU and memory usage. Levels below 6 will use less CPU and memory at the cost of lower compression rates.
memLevel int
Specifies how much memory should be allocated for the internal compression state. 1 uses minimum memory but is slow and reduces compression ratio; 9 uses maximum memory for optimal speed. The default value is 8. [...]
raw bool
When true, deflate generates raw data with no zlib header or trailer, and will not compute an adler32 check value
strategy int
Tunes the compression algorithm. Use the value ZLibOption.strategyDefault for normal data, ZLibOption.strategyFiltered for data produced by a filter (or predictor), ZLibOption.strategyHuffmanOnly to force Huffman encoding only (no string match), or ZLibOption.strategyRle to limit match distances to one (run-length encoding).
windowBits int
Base two logarithm of the window size (the size of the history buffer). It should be in the range 8..15. Larger values result in better compression at the expense of memory usage. The default value is 15
hashCode int
The hash code for this object. [...]
read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited


convert(List<int> bytes) List<int>
Convert a list of bytes using the options given to the ZLibEncoder constructor.
startChunkedConversion(Sink<List<int>> sink) ByteConversionSink
Start a chunked conversion using the options given to the ZLibEncoder constructor. While it accepts any Sink taking List's, the optimal sink to be passed as sink is a ByteConversionSink.
bind(Stream<List<int>> stream) Stream<List<int>>
Transforms the provided stream. [...]
cast<RS, RT>() Converter<RS, RT>
Provides a Converter<RS, RT> view of this stream transformer. [...]
fuse<TT>(Converter<List<int>, TT> other) Converter<List<int>, TT>
Fuses this with other. [...]
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
toString() String
Returns a string representation of this object.


operator ==(dynamic other) bool
The equality operator. [...]