dart:io
ZLibEncoder class
The ZLibEncoder encoder is used by ZLibCodec and GZipCodec to compress data.
- Inheritance
Constructors
- ZLibEncoder({bool gzip: false, int level: ZLibOption.defaultLevel, int windowBits: ZLibOption.defaultWindowBits, int memLevel: ZLibOption.defaultMemLevel, int strategy: ZLibOption.strategyDefault, List<int> dictionary, bool raw: false })
Properties
- dictionary → List<int>
final
- Initial compression dictionary. [...]
- gzip → bool
final
- When true,
GZip frames will be added to the compressed data. - level → int
final
- 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
final
- 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
final
- When true, deflate generates raw data with no zlib header or trailer, and will not compute an adler32 check value
- strategy → int
final
- 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
final
- 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
read-only, inherited
- The hash code for this object. [...]
- runtimeType → Type
read-only, inherited
- A representation of the runtime type of the object.
Methods
- convert(List<int> bytes) → List<int>
override
- Convert a list of bytes using the options given to the ZLibEncoder constructor.
- startChunkedConversion(Sink<List<int>> sink) → ByteConversionSink
override
- Start a chunked conversion using the options given to the ZLibEncoder constructor. While it accepts any Sink taking List<int>'s, the optimal sink to be passed as
sink is a ByteConversionSink. - bind(Stream<List<int>> stream) → Stream<List<int>>
inherited
- Transforms the provided
stream. [...] - cast<RS, RT>() → Converter<RS, RT>
inherited
- Provides a
Converter<RS, RT> view of this stream transformer. [...] - fuse<TT>(Converter<List<int>, TT> other) → Converter<List<int>, TT>
inherited
- Fuses
this with other. [...] - noSuchMethod(Invocation invocation) → dynamic
inherited
- Invoked when a non-existent method or property is accessed. [...]
- toString() → String
inherited
- Returns a string representation of this object.
Operators
- operator ==(dynamic other) → bool
inherited
- The equality operator. [...]