dart:io

GZipCodec class

The GZipCodec encodes raw bytes to GZip compressed bytes and decodes GZip compressed bytes to raw bytes.

The difference between ZLibCodec and GZipCodec is that the GZipCodec wraps the ZLib compressed bytes in GZip frames.

Inheritance

Constructors

GZipCodec({int level: ZLibOption.DEFAULT_LEVEL, int windowBits: ZLibOption.DEFAULT_WINDOW_BITS, int memLevel: ZLibOption.DEFAULT_MEM_LEVEL, int strategy: ZLibOption.STRATEGY_DEFAULT, List<int> dictionary: null, bool raw: false, bool gzip: true })

Properties

decoder → ZLibDecoder
read-only

Get a ZLibDecoder for decoding GZip compressed data.

dictionary → List<int>
final

Initial compression dictionary.

encoder → ZLibEncoder
read-only

Get a ZLibEncoder for encoding to GZip compressed data.

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.STRATEGY_DEFAULT for normal data, ZLibOption.STRATEGY_FILTERED for data produced by a filter (or predictor), ZLibOption.STRATEGY_HUFFMAN_ONLY to force Huffman encoding only (no string match), or ZLibOption.STRATEGY_RLE 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.

inverted → Codec<List<int>, List<int>>
read-only, inherited

Inverts this.

runtimeType → Type
read-only, inherited

A representation of the runtime type of the object.

Operators

operator ==(other) → bool
inherited

The equality operator.

Methods

decode(List<int> encoded) → List<int>
inherited
encode(List<int> input) → List<int>
inherited
fuse<R>(Codec<List<int>, R> other) → Codec<List<int>, R>
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.

© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-io/GZipCodec-class.html