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: null, 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>
- 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>>
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. [...]