Zlib
目录
- Threadpool usage and performance considerations
- Compressing HTTP requests and responses
- Memory usage tuning
- Flushing
- Constants
- Class: Options
- Class: BrotliOptions
- Class: zlib.BrotliCompress
- Class: zlib.BrotliDecompress
- Class: zlib.Deflate
- Class: zlib.DeflateRaw
- Class: zlib.Gunzip
- Class: zlib.Gzip
- Class: zlib.Inflate
- Class: zlib.InflateRaw
- Class: zlib.Unzip
- Class: zlib.ZlibBase
- zlib.constants
- zlib.createBrotliCompress([options])
- zlib.createBrotliDecompress([options])
- zlib.createDeflate([options])
- zlib.createDeflateRaw([options])
- zlib.createGunzip([options])
- zlib.createGzip([options])
- zlib.createInflate([options])
- zlib.createInflateRaw([options])
- zlib.createUnzip([options])
- Convenience methods
- zlib.brotliCompress(buffer[, options], callback)
- zlib.brotliCompressSync(buffer[, options])
- zlib.brotliDecompress(buffer[, options], callback)
- zlib.brotliDecompressSync(buffer[, options])
- zlib.deflate(buffer[, options], callback)
- zlib.deflateSync(buffer[, options])
- zlib.deflateRaw(buffer[, options], callback)
- zlib.deflateRawSync(buffer[, options])
- zlib.gunzip(buffer[, options], callback)
- zlib.gunzipSync(buffer[, options])
- zlib.gzip(buffer[, options], callback)
- zlib.gzipSync(buffer[, options])
- zlib.inflate(buffer[, options], callback)
- zlib.inflateSync(buffer[, options])
- zlib.inflateRaw(buffer[, options], callback)
- zlib.inflateRawSync(buffer[, options])
- zlib.unzip(buffer[, options], callback)
- zlib.unzipSync(buffer[, options])
Added in: v0.10.0
源代码: lib/zlib.js
The node:zlib
module provides compression functionality implemented using
Gzip, Deflate/Inflate, and Brotli.
To access it:
JS
Compression and decompression are built around the Node.js Streams API.
Compressing or decompressing a stream (such as a file) can be accomplished by
piping the source stream through a zlib
Transform
stream into a destination
stream:
JS
It is also possible to compress or decompress data in a single step:
JS
Threadpool usage and performance considerations
All zlib
APIs, except those that are explicitly synchronous, use the Node.js
internal threadpool. This can lead to surprising effects and performance
limitations in some applications.
Creating and using a large number of zlib objects simultaneously can cause significant memory fragmentation.
JS
In the preceding example, 30,000 deflate instances are created concurrently. Because of how some operating systems handle memory allocation and deallocation, this may lead to significant memory fragmentation.
It is strongly recommended that the results of compression operations be cached to avoid duplication of effort.
Compressing HTTP requests and responses
The node:zlib
module can be used to implement support for the gzip
, deflate
and br
content-encoding mechanisms defined by
HTTP.
The HTTP Accept-Encoding
header is used within an HTTP request to identify
the compression encodings accepted by the client. The Content-Encoding
header is used to identify the compression encodings actually applied to a
message.
The examples given below are drastically simplified to show the basic concept.
Using zlib
encoding can be expensive, and the results ought to be cached.
See Memory usage tuning for more information on the speed/memory/compression
tradeoffs involved in zlib
usage.
JS
JS
By default, the zlib
methods will throw an error when decompressing
truncated data. However, if it is known that the data is incomplete, or
the desire is to inspect only the beginning of a compressed file, it is
possible to suppress the default error handling by changing the flushing
method that is used to decompress the last chunk of input data:
JS
This will not change the behavior in other error-throwing situations, e.g. when the input data has an invalid format. Using this method, it will not be possible to determine whether the input ended prematurely or lacks the integrity checks, making it necessary to manually check that the decompressed result is valid.
Memory usage tuning
For zlib-based streams
From zlib/zconf.h
, modified for Node.js usage:
The memory requirements for deflate are (in bytes):
JS
That is: 128K for windowBits
= 15 + 128K for memLevel
= 8
(default values) plus a few kilobytes for small objects.
For example, to reduce the default memory requirements from 256K to 128K, the options should be set to:
JS
This will, however, generally degrade compression.
The memory requirements for inflate are (in bytes) 1 << windowBits
.
That is, 32K for windowBits
= 15 (default value) plus a few kilobytes
for small objects.
This is in addition to a single internal output slab buffer of size
chunkSize
, which defaults to 16K.
The speed of zlib
compression is affected most dramatically by the
level
setting. A higher level will result in better compression, but
will take longer to complete. A lower level will result in less
compression, but will be much faster.
In general, greater memory usage options will mean that Node.js has to make
fewer calls to zlib
because it will be able to process more data on
each write
operation. So, this is another factor that affects the
speed, at the cost of memory usage.
For Brotli-based streams
There are equivalents to the zlib options for Brotli-based streams, although these options have different ranges than the zlib ones:
- zlib's
level
option matches Brotli'sBROTLI_PARAM_QUALITY
option. - zlib's
windowBits
option matches Brotli'sBROTLI_PARAM_LGWIN
option.
See below for more details on Brotli-specific options.
Flushing
Calling .flush()
on a compression stream will make zlib
return as much
output as currently possible. This may come at the cost of degraded compression
quality, but can be useful when data needs to be available as soon as possible.
In the following example, flush()
is used to write a compressed partial
HTTP response to the client:
JS
Constants
Added in: v0.5.8
zlib constants
All of the constants defined in zlib.h
are also defined on
require('node:zlib').constants
. In the normal course of operations, it will
not be necessary to use these constants. They are documented so that their
presence is not surprising. This section is taken almost directly from the
zlib documentation.
Previously, the constants were available directly from require('node:zlib')
,
for instance zlib.Z_NO_FLUSH
. Accessing the constants directly from the module
is currently still possible but is deprecated.
Allowed flush values.
zlib.constants.Z_NO_FLUSH
zlib.constants.Z_PARTIAL_FLUSH
zlib.constants.Z_SYNC_FLUSH
zlib.constants.Z_FULL_FLUSH
zlib.constants.Z_FINISH
zlib.constants.Z_BLOCK
zlib.constants.Z_TREES
Return codes for the compression/decompression functions. Negative values are errors, positive values are used for special but normal events.
zlib.constants.Z_OK
zlib.constants.Z_STREAM_END
zlib.constants.Z_NEED_DICT
zlib.constants.Z_ERRNO
zlib.constants.Z_STREAM_ERROR
zlib.constants.Z_DATA_ERROR
zlib.constants.Z_MEM_ERROR
zlib.constants.Z_BUF_ERROR
zlib.constants.Z_VERSION_ERROR
Compression levels.
zlib.constants.Z_NO_COMPRESSION
zlib.constants.Z_BEST_SPEED
zlib.constants.Z_BEST_COMPRESSION
zlib.constants.Z_DEFAULT_COMPRESSION
Compression strategy.
zlib.constants.Z_FILTERED
zlib.constants.Z_HUFFMAN_ONLY
zlib.constants.Z_RLE
zlib.constants.Z_FIXED
zlib.constants.Z_DEFAULT_STRATEGY
Brotli constants
Added in: v11.7.0, v10.16.0
There are several options and other constants available for Brotli-based streams:
Flush operations
The following values are valid flush operations for Brotli-based streams:
zlib.constants.BROTLI_OPERATION_PROCESS
(default for all operations)zlib.constants.BROTLI_OPERATION_FLUSH
(default when calling.flush()
)zlib.constants.BROTLI_OPERATION_FINISH
(default for the last chunk)zlib.constants.BROTLI_OPERATION_EMIT_METADATA
- This particular operation may be hard to use in a Node.js context, as the streaming layer makes it hard to know which data will end up in this frame. Also, there is currently no way to consume this data through the Node.js API.
Compressor options
There are several options that can be set on Brotli encoders, affecting
compression efficiency and speed. Both the keys and the values can be accessed
as properties of the zlib.constants
object.
The most important options are:
BROTLI_PARAM_MODE
BROTLI_MODE_GENERIC
(default)BROTLI_MODE_TEXT
, adjusted for UTF-8 textBROTLI_MODE_FONT
, adjusted for WOFF 2.0 fonts
BROTLI_PARAM_QUALITY
- Ranges from
BROTLI_MIN_QUALITY
toBROTLI_MAX_QUALITY
, with a default ofBROTLI_DEFAULT_QUALITY
.
- Ranges from
BROTLI_PARAM_SIZE_HINT
- Integer value representing the expected input size;
defaults to
0
for an unknown input size.
- Integer value representing the expected input size;
defaults to
The following flags can be set for advanced control over the compression algorithm and memory usage tuning:
BROTLI_PARAM_LGWIN
- Ranges from
BROTLI_MIN_WINDOW_BITS
toBROTLI_MAX_WINDOW_BITS
, with a default ofBROTLI_DEFAULT_WINDOW
, or up toBROTLI_LARGE_MAX_WINDOW_BITS
if theBROTLI_PARAM_LARGE_WINDOW
flag is set.
- Ranges from
BROTLI_PARAM_LGBLOCK
- Ranges from
BROTLI_MIN_INPUT_BLOCK_BITS
toBROTLI_MAX_INPUT_BLOCK_BITS
.
- Ranges from
BROTLI_PARAM_DISABLE_LITERAL_CONTEXT_MODELING
- Boolean flag that decreases compression ratio in favour of decompression speed.
BROTLI_PARAM_LARGE_WINDOW
- Boolean flag enabling “Large Window Brotli” mode (not compatible with the Brotli format as standardized in RFC 7932).
BROTLI_PARAM_NPOSTFIX
- Ranges from
0
toBROTLI_MAX_NPOSTFIX
.
- Ranges from
BROTLI_PARAM_NDIRECT
- Ranges from
0
to15 << NPOSTFIX
in steps of1 << NPOSTFIX
.
- Ranges from
Decompressor options
These advanced options are available for controlling decompression:
BROTLI_DECODER_PARAM_DISABLE_RING_BUFFER_REALLOCATION
- Boolean flag that affects internal memory allocation patterns.
BROTLI_DECODER_PARAM_LARGE_WINDOW
- Boolean flag enabling “Large Window Brotli” mode (not compatible with the Brotli format as standardized in RFC 7932).
C Options
历史
版本 | 更改 |
---|---|
v14.5.0, v12.19.0 | The `maxOutputLength` option is supported now. |
v9.4.0 | The `dictionary` option can be an `ArrayBuffer`. |
v8.0.0 | The `dictionary` option can be an `Uint8Array` now. |
v5.11.0 | The `finishFlush` option is supported now. |
v0.11.1 | Added in: v0.11.1 |
Each zlib-based class takes an options
object. No options are required.
Some options are only relevant when compressing and are ignored by the decompression classes.
flush
integer
Default:zlib.constants.Z_NO_FLUSH
finishFlush
integer
Default:zlib.constants.Z_FINISH
chunkSize
integer
Default:16 * 1024
windowBits
integer
level
integer
(compression only)memLevel
integer
(compression only)strategy
integer
(compression only)dictionary
Buffer
|TypedArray
|DataView
|ArrayBuffer
(deflate/inflate only, empty dictionary by default)info
boolean
(Iftrue
, returns an object withbuffer
andengine
.)maxOutputLength
integer
Limits output size when using convenience methods. Default:buffer.kMaxLength
See the deflateInit2
and inflateInit2
documentation for more
information.
C BrotliOptions
历史
版本 | 更改 |
---|---|
v14.5.0, v12.19.0 | The `maxOutputLength` option is supported now. |
v11.7.0 | Added in: v11.7.0 |
Each Brotli-based class takes an options
object. All options are optional.
flush
integer
Default:zlib.constants.BROTLI_OPERATION_PROCESS
finishFlush
integer
Default:zlib.constants.BROTLI_OPERATION_FINISH
chunkSize
integer
Default:16 * 1024
params
Object
Key-value object containing indexed Brotli parameters.maxOutputLength
integer
Limits output size when using convenience methods. Default:buffer.kMaxLength
For example:
JS
C zlib.BrotliCompress
Added in: v11.7.0, v10.16.0
Compress data using the Brotli algorithm.
C zlib.BrotliDecompress
Added in: v11.7.0, v10.16.0
Decompress data using the Brotli algorithm.
C zlib.Deflate
Added in: v0.5.8
Compress data using deflate.
C zlib.DeflateRaw
Added in: v0.5.8
Compress data using deflate, and do not append a zlib
header.
C zlib.Gunzip
历史
版本 | 更改 |
---|---|
v6.0.0 | Trailing garbage at the end of the input stream will now result in an `'error'` event. |
v5.9.0 | Multiple concatenated gzip file members are supported now. |
v5.0.0 | A truncated input stream will now result in an `'error'` event. |
v0.5.8 | Added in: v0.5.8 |
Decompress a gzip stream.
C zlib.Gzip
Added in: v0.5.8
Compress data using gzip.
C zlib.Inflate
历史
版本 | 更改 |
---|---|
v5.0.0 | A truncated input stream will now result in an `'error'` event. |
v0.5.8 | Added in: v0.5.8 |
Decompress a deflate stream.
C zlib.InflateRaw
历史
版本 | 更改 |
---|---|
v6.8.0 | Custom dictionaries are now supported by `InflateRaw`. |
v5.0.0 | A truncated input stream will now result in an `'error'` event. |
v0.5.8 | Added in: v0.5.8 |
Decompress a raw deflate stream.
C zlib.Unzip
Added in: v0.5.8
Decompress either a Gzip- or Deflate-compressed stream by auto-detecting the header.
C zlib.ZlibBase
历史
版本 | 更改 |
---|---|
v11.7.0, v10.16.0 | This class was renamed from `Zlib` to `ZlibBase`. |
v0.5.8 | Added in: v0.5.8 |
Not exported by the node:zlib
module. It is documented here because it is the
base class of the compressor/decompressor classes.
This class inherits from stream.Transform
, allowing node:zlib
objects to
be used in pipes and similar stream operations.
M zlib.bytesRead
Deprecated in: v10.0.0
Deprecated alias for zlib.bytesWritten
. This original name was chosen
because it also made sense to interpret the value as the number of bytes
read by the engine, but is inconsistent with other streams in Node.js that
expose values under these names.
M zlib.bytesWritten
Added in: v10.0.0
The zlib.bytesWritten
property specifies the number of bytes written to
the engine, before the bytes are processed (compressed or decompressed,
as appropriate for the derived class).
M zlib.close([callback])
Added in: v0.9.4
callback
Function
Close the underlying handle.
M zlib.flush([kind, ]callback)
Added in: v0.5.8
kind
Default:zlib.constants.Z_FULL_FLUSH
for zlib-based streams,zlib.constants.BROTLI_OPERATION_FLUSH
for Brotli-based streams.callback
Function
Flush pending data. Don't call this frivolously, premature flushes negatively impact the effectiveness of the compression algorithm.
Calling this only flushes data from the internal zlib
state, and does not
perform flushing of any kind on the streams level. Rather, it behaves like a
normal call to .write()
, i.e. it will be queued up behind other pending
writes and will only produce output when data is being read from the stream.
M zlib.params(level, strategy, callback)
Added in: v0.11.4
This function is only available for zlib-based streams, i.e. not Brotli.
Dynamically update the compression level and compression strategy. Only applicable to deflate algorithm.
M zlib.reset()
Added in: v0.7.0
Reset the compressor/decompressor to factory defaults. Only applicable to the inflate and deflate algorithms.
M zlib.constants
Added in: v7.0.0
Provides an object enumerating Zlib-related constants.
M zlib.createBrotliCompress([options])
Added in: v11.7.0, v10.16.0
options
brotli options
Creates and returns a new BrotliCompress
object.
M zlib.createBrotliDecompress([options])
Added in: v11.7.0, v10.16.0
options
brotli options
Creates and returns a new BrotliDecompress
object.
M zlib.createDeflate([options])
Added in: v0.5.8
options
zlib options
Creates and returns a new Deflate
object.
M zlib.createDeflateRaw([options])
Added in: v0.5.8
options
zlib options
Creates and returns a new DeflateRaw
object.
An upgrade of zlib from 1.2.8 to 1.2.11 changed behavior when windowBits
is set to 8 for raw deflate streams. zlib would automatically set windowBits
to 9 if was initially set to 8. Newer versions of zlib will throw an exception,
so Node.js restored the original behavior of upgrading a value of 8 to 9,
since passing windowBits = 9
to zlib actually results in a compressed stream
that effectively uses an 8-bit window only.
M zlib.createGunzip([options])
Added in: v0.5.8
options
zlib options
Creates and returns a new Gunzip
object.
M zlib.createGzip([options])
Added in: v0.5.8
options
zlib options
Creates and returns a new Gzip
object.
See example.
M zlib.createInflate([options])
Added in: v0.5.8
options
zlib options
Creates and returns a new Inflate
object.
M zlib.createInflateRaw([options])
Added in: v0.5.8
options
zlib options
Creates and returns a new InflateRaw
object.
M zlib.createUnzip([options])
Added in: v0.5.8
options
zlib options
Creates and returns a new Unzip
object.
Convenience methods
All of these take a Buffer
, TypedArray
, DataView
,
ArrayBuffer
or string as the first argument, an optional second argument
to supply options to the zlib
classes and will call the supplied callback
with callback(error, result)
.
Every method has a *Sync
counterpart, which accept the same arguments, but
without a callback.
M zlib.brotliCompress(buffer[, options], callback)
Added in: v11.7.0, v10.16.0
buffer
Buffer
|TypedArray
|DataView
|ArrayBuffer
|string
options
brotli options
callback
Function
M zlib.brotliCompressSync(buffer[, options])
Added in: v11.7.0, v10.16.0
buffer
Buffer
|TypedArray
|DataView
|ArrayBuffer
|string
options
brotli options
Compress a chunk of data with BrotliCompress
.
M zlib.brotliDecompress(buffer[, options], callback)
Added in: v11.7.0, v10.16.0
buffer
Buffer
|TypedArray
|DataView
|ArrayBuffer
|string
options
brotli options
callback
Function
M zlib.brotliDecompressSync(buffer[, options])
Added in: v11.7.0, v10.16.0
buffer
Buffer
|TypedArray
|DataView
|ArrayBuffer
|string
options
brotli options
Decompress a chunk of data with BrotliDecompress
.
M zlib.deflate(buffer[, options], callback)
历史
版本 | 更改 |
---|---|
v9.4.0 | The `buffer` parameter can be an `ArrayBuffer`. |
v8.0.0 | The `buffer` parameter can be any `TypedArray` or `DataView`. |
v8.0.0 | The `buffer` parameter can be an `Uint8Array` now. |
v0.6.0 | Added in: v0.6.0 |
buffer
Buffer
|TypedArray
|DataView
|ArrayBuffer
|string
options
zlib options
callback
Function
M zlib.deflateSync(buffer[, options])
历史
版本 | 更改 |
---|---|
v9.4.0 | The `buffer` parameter can be an `ArrayBuffer`. |
v8.0.0 | The `buffer` parameter can be any `TypedArray` or `DataView`. |
v8.0.0 | The `buffer` parameter can be an `Uint8Array` now. |
v0.11.12 | Added in: v0.11.12 |
buffer
Buffer
|TypedArray
|DataView
|ArrayBuffer
|string
options
zlib options
Compress a chunk of data with Deflate
.
M zlib.deflateRaw(buffer[, options], callback)
历史
版本 | 更改 |
---|---|
v8.0.0 | The `buffer` parameter can be any `TypedArray` or `DataView`. |
v8.0.0 | The `buffer` parameter can be an `Uint8Array` now. |
v0.6.0 | Added in: v0.6.0 |
buffer
Buffer
|TypedArray
|DataView
|ArrayBuffer
|string
options
zlib options
callback
Function
M zlib.deflateRawSync(buffer[, options])
历史
版本 | 更改 |
---|---|
v9.4.0 | The `buffer` parameter can be an `ArrayBuffer`. |
v8.0.0 | The `buffer` parameter can be any `TypedArray` or `DataView`. |
v8.0.0 | The `buffer` parameter can be an `Uint8Array` now. |
v0.11.12 | Added in: v0.11.12 |
buffer
Buffer
|TypedArray
|DataView
|ArrayBuffer
|string
options
zlib options
Compress a chunk of data with DeflateRaw
.
M zlib.gunzip(buffer[, options], callback)
历史
版本 | 更改 |
---|---|
v9.4.0 | The `buffer` parameter can be an `ArrayBuffer`. |
v8.0.0 | The `buffer` parameter can be any `TypedArray` or `DataView`. |
v8.0.0 | The `buffer` parameter can be an `Uint8Array` now. |
v0.6.0 | Added in: v0.6.0 |
buffer
Buffer
|TypedArray
|DataView
|ArrayBuffer
|string
options
zlib options
callback
Function
M zlib.gunzipSync(buffer[, options])
历史
版本 | 更改 |
---|---|
v9.4.0 | The `buffer` parameter can be an `ArrayBuffer`. |
v8.0.0 | The `buffer` parameter can be any `TypedArray` or `DataView`. |
v8.0.0 | The `buffer` parameter can be an `Uint8Array` now. |
v0.11.12 | Added in: v0.11.12 |
buffer
Buffer
|TypedArray
|DataView
|ArrayBuffer
|string
options
zlib options
Decompress a chunk of data with Gunzip
.
M zlib.gzip(buffer[, options], callback)
历史
版本 | 更改 |
---|---|
v9.4.0 | The `buffer` parameter can be an `ArrayBuffer`. |
v8.0.0 | The `buffer` parameter can be any `TypedArray` or `DataView`. |
v8.0.0 | The `buffer` parameter can be an `Uint8Array` now. |
v0.6.0 | Added in: v0.6.0 |
buffer
Buffer
|TypedArray
|DataView
|ArrayBuffer
|string
options
zlib options
callback
Function
M zlib.gzipSync(buffer[, options])
历史
版本 | 更改 |
---|---|
v9.4.0 | The `buffer` parameter can be an `ArrayBuffer`. |
v8.0.0 | The `buffer` parameter can be any `TypedArray` or `DataView`. |
v8.0.0 | The `buffer` parameter can be an `Uint8Array` now. |
v0.11.12 | Added in: v0.11.12 |
buffer
Buffer
|TypedArray
|DataView
|ArrayBuffer
|string
options
zlib options
Compress a chunk of data with Gzip
.
M zlib.inflate(buffer[, options], callback)
历史
版本 | 更改 |
---|---|
v9.4.0 | The `buffer` parameter can be an `ArrayBuffer`. |
v8.0.0 | The `buffer` parameter can be any `TypedArray` or `DataView`. |
v8.0.0 | The `buffer` parameter can be an `Uint8Array` now. |
v0.6.0 | Added in: v0.6.0 |
buffer
Buffer
|TypedArray
|DataView
|ArrayBuffer
|string
options
zlib options
callback
Function
M zlib.inflateSync(buffer[, options])
历史
版本 | 更改 |
---|---|
v9.4.0 | The `buffer` parameter can be an `ArrayBuffer`. |
v8.0.0 | The `buffer` parameter can be any `TypedArray` or `DataView`. |
v8.0.0 | The `buffer` parameter can be an `Uint8Array` now. |
v0.11.12 | Added in: v0.11.12 |
buffer
Buffer
|TypedArray
|DataView
|ArrayBuffer
|string
options
zlib options
Decompress a chunk of data with Inflate
.
M zlib.inflateRaw(buffer[, options], callback)
历史
版本 | 更改 |
---|---|
v9.4.0 | The `buffer` parameter can be an `ArrayBuffer`. |
v8.0.0 | The `buffer` parameter can be any `TypedArray` or `DataView`. |
v8.0.0 | The `buffer` parameter can be an `Uint8Array` now. |
v0.6.0 | Added in: v0.6.0 |
buffer
Buffer
|TypedArray
|DataView
|ArrayBuffer
|string
options
zlib options
callback
Function
M zlib.inflateRawSync(buffer[, options])
历史
版本 | 更改 |
---|---|
v9.4.0 | The `buffer` parameter can be an `ArrayBuffer`. |
v8.0.0 | The `buffer` parameter can be any `TypedArray` or `DataView`. |
v8.0.0 | The `buffer` parameter can be an `Uint8Array` now. |
v0.11.12 | Added in: v0.11.12 |
buffer
Buffer
|TypedArray
|DataView
|ArrayBuffer
|string
options
zlib options
Decompress a chunk of data with InflateRaw
.
M zlib.unzip(buffer[, options], callback)
历史
版本 | 更改 |
---|---|
v9.4.0 | The `buffer` parameter can be an `ArrayBuffer`. |
v8.0.0 | The `buffer` parameter can be any `TypedArray` or `DataView`. |
v8.0.0 | The `buffer` parameter can be an `Uint8Array` now. |
v0.6.0 | Added in: v0.6.0 |
buffer
Buffer
|TypedArray
|DataView
|ArrayBuffer
|string
options
zlib options
callback
Function
M zlib.unzipSync(buffer[, options])
历史
版本 | 更改 |
---|---|
v9.4.0 | The `buffer` parameter can be an `ArrayBuffer`. |
v8.0.0 | The `buffer` parameter can be any `TypedArray` or `DataView`. |
v8.0.0 | The `buffer` parameter can be an `Uint8Array` now. |
v0.11.12 | Added in: v0.11.12 |
buffer
Buffer
|TypedArray
|DataView
|ArrayBuffer
|string
options
zlib options
Decompress a chunk of data with Unzip
.