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.defaultLevel, int windowBits = ZLibOption.defaultWindowBits, int memLevel = ZLibOption.defaultMemLevel, int strategy = ZLibOption.strategyDefault, List<int>? dictionary, bool raw = false, bool gzip = true})

Properties

decoder → ZLibDecoder
read-only, override
Get a ZLibDecoder for decoding GZip compressed data.
dictionary → List<int>?
final
Initial compression dictionary. [...]
encoder → ZLibEncoder
read-only, override
Get a ZLibEncoder for encoding to GZip compressed data.
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. [...]
inverted → Codec<List<int>, List<int>>
read-only, inherited
Inverts this. [...]
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

decode(List<int> encoded) → List<int>
inherited
Decodes encoded data. [...]
encode(List<int> input) → List<int>
inherited
Encodes input. [...]
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
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/GZipCodec-class.html