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.
hashCode → int
read-only, inherited
The hash code for this object. [...]
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
runtimeType → Type
read-only, inherited
A representation of the runtime type of the object.
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

Methods

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. [...]
convert(List<int> bytes) → List<int>
override
Convert a list of bytes using the options given to the ZLibEncoder constructor.
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. [...]
startChunkedConversion(Sink<List<int>> sink) → ByteConversionSink
override
Start a chunked conversion using the options given to the ZLibEncoder constructor. [...]
toString() → String
inherited
A string representation of this object. [...]

Operators

operator ==(Object other) → bool
inherited
The equality operator. [...]

© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.13.0/dart-io/ZLibEncoder-class.html