mirror of
https://github.com/swc-project/swc.git
synced 2024-12-29 00:23:10 +03:00
408 lines
12 KiB
TypeScript
408 lines
12 KiB
TypeScript
|
// Loaded from https://dev.jspm.io/npm:pako@1.0.11/lib/deflate.dew.js
|
||
|
|
||
|
|
||
|
import { dew as _deflateDewDew } from "./zlib/deflate.dew.js";
|
||
|
import { dew as _commonDewDew } from "./utils/common.dew.js";
|
||
|
import { dew as _stringsDewDew } from "./utils/strings.dew.js";
|
||
|
import { dew as _messagesDewDew } from "./zlib/messages.dew.js";
|
||
|
import { dew as _zstreamDewDew } from "./zlib/zstream.dew.js";
|
||
|
var exports = {},
|
||
|
_dewExec = false;
|
||
|
export function dew() {
|
||
|
if (_dewExec) return exports;
|
||
|
_dewExec = true;
|
||
|
|
||
|
var zlib_deflate = _deflateDewDew();
|
||
|
|
||
|
var utils = _commonDewDew();
|
||
|
|
||
|
var strings = _stringsDewDew();
|
||
|
|
||
|
var msg = _messagesDewDew();
|
||
|
|
||
|
var ZStream = _zstreamDewDew();
|
||
|
|
||
|
var toString = Object.prototype.toString;
|
||
|
/* Public constants ==========================================================*/
|
||
|
|
||
|
/* ===========================================================================*/
|
||
|
|
||
|
var Z_NO_FLUSH = 0;
|
||
|
var Z_FINISH = 4;
|
||
|
var Z_OK = 0;
|
||
|
var Z_STREAM_END = 1;
|
||
|
var Z_SYNC_FLUSH = 2;
|
||
|
var Z_DEFAULT_COMPRESSION = -1;
|
||
|
var Z_DEFAULT_STRATEGY = 0;
|
||
|
var Z_DEFLATED = 8;
|
||
|
/* ===========================================================================*/
|
||
|
|
||
|
/**
|
||
|
* class Deflate
|
||
|
*
|
||
|
* Generic JS-style wrapper for zlib calls. If you don't need
|
||
|
* streaming behaviour - use more simple functions: [[deflate]],
|
||
|
* [[deflateRaw]] and [[gzip]].
|
||
|
**/
|
||
|
|
||
|
/* internal
|
||
|
* Deflate.chunks -> Array
|
||
|
*
|
||
|
* Chunks of output data, if [[Deflate#onData]] not overridden.
|
||
|
**/
|
||
|
|
||
|
/**
|
||
|
* Deflate.result -> Uint8Array|Array
|
||
|
*
|
||
|
* Compressed result, generated by default [[Deflate#onData]]
|
||
|
* and [[Deflate#onEnd]] handlers. Filled after you push last chunk
|
||
|
* (call [[Deflate#push]] with `Z_FINISH` / `true` param) or if you
|
||
|
* push a chunk with explicit flush (call [[Deflate#push]] with
|
||
|
* `Z_SYNC_FLUSH` param).
|
||
|
**/
|
||
|
|
||
|
/**
|
||
|
* Deflate.err -> Number
|
||
|
*
|
||
|
* Error code after deflate finished. 0 (Z_OK) on success.
|
||
|
* You will not need it in real life, because deflate errors
|
||
|
* are possible only on wrong options or bad `onData` / `onEnd`
|
||
|
* custom handlers.
|
||
|
**/
|
||
|
|
||
|
/**
|
||
|
* Deflate.msg -> String
|
||
|
*
|
||
|
* Error message, if [[Deflate.err]] != 0
|
||
|
**/
|
||
|
|
||
|
/**
|
||
|
* new Deflate(options)
|
||
|
* - options (Object): zlib deflate options.
|
||
|
*
|
||
|
* Creates new deflator instance with specified params. Throws exception
|
||
|
* on bad params. Supported options:
|
||
|
*
|
||
|
* - `level`
|
||
|
* - `windowBits`
|
||
|
* - `memLevel`
|
||
|
* - `strategy`
|
||
|
* - `dictionary`
|
||
|
*
|
||
|
* [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)
|
||
|
* for more information on these.
|
||
|
*
|
||
|
* Additional options, for internal needs:
|
||
|
*
|
||
|
* - `chunkSize` - size of generated data chunks (16K by default)
|
||
|
* - `raw` (Boolean) - do raw deflate
|
||
|
* - `gzip` (Boolean) - create gzip wrapper
|
||
|
* - `to` (String) - if equal to 'string', then result will be "binary string"
|
||
|
* (each char code [0..255])
|
||
|
* - `header` (Object) - custom header for gzip
|
||
|
* - `text` (Boolean) - true if compressed data believed to be text
|
||
|
* - `time` (Number) - modification time, unix timestamp
|
||
|
* - `os` (Number) - operation system code
|
||
|
* - `extra` (Array) - array of bytes with extra data (max 65536)
|
||
|
* - `name` (String) - file name (binary string)
|
||
|
* - `comment` (String) - comment (binary string)
|
||
|
* - `hcrc` (Boolean) - true if header crc should be added
|
||
|
*
|
||
|
* ##### Example:
|
||
|
*
|
||
|
* ```javascript
|
||
|
* var pako = require('pako')
|
||
|
* , chunk1 = Uint8Array([1,2,3,4,5,6,7,8,9])
|
||
|
* , chunk2 = Uint8Array([10,11,12,13,14,15,16,17,18,19]);
|
||
|
*
|
||
|
* var deflate = new pako.Deflate({ level: 3});
|
||
|
*
|
||
|
* deflate.push(chunk1, false);
|
||
|
* deflate.push(chunk2, true); // true -> last chunk
|
||
|
*
|
||
|
* if (deflate.err) { throw new Error(deflate.err); }
|
||
|
*
|
||
|
* console.log(deflate.result);
|
||
|
* ```
|
||
|
**/
|
||
|
|
||
|
function Deflate(options) {
|
||
|
if (!(this instanceof Deflate)) return new Deflate(options);
|
||
|
this.options = utils.assign({
|
||
|
level: Z_DEFAULT_COMPRESSION,
|
||
|
method: Z_DEFLATED,
|
||
|
chunkSize: 16384,
|
||
|
windowBits: 15,
|
||
|
memLevel: 8,
|
||
|
strategy: Z_DEFAULT_STRATEGY,
|
||
|
to: ''
|
||
|
}, options || {});
|
||
|
var opt = this.options;
|
||
|
|
||
|
if (opt.raw && opt.windowBits > 0) {
|
||
|
opt.windowBits = -opt.windowBits;
|
||
|
} else if (opt.gzip && opt.windowBits > 0 && opt.windowBits < 16) {
|
||
|
opt.windowBits += 16;
|
||
|
}
|
||
|
|
||
|
this.err = 0; // error code, if happens (0 = Z_OK)
|
||
|
|
||
|
this.msg = ''; // error message
|
||
|
|
||
|
this.ended = false; // used to avoid multiple onEnd() calls
|
||
|
|
||
|
this.chunks = []; // chunks of compressed data
|
||
|
|
||
|
this.strm = new ZStream();
|
||
|
this.strm.avail_out = 0;
|
||
|
var status = zlib_deflate.deflateInit2(this.strm, opt.level, opt.method, opt.windowBits, opt.memLevel, opt.strategy);
|
||
|
|
||
|
if (status !== Z_OK) {
|
||
|
throw new Error(msg[status]);
|
||
|
}
|
||
|
|
||
|
if (opt.header) {
|
||
|
zlib_deflate.deflateSetHeader(this.strm, opt.header);
|
||
|
}
|
||
|
|
||
|
if (opt.dictionary) {
|
||
|
var dict; // Convert data if needed
|
||
|
|
||
|
if (typeof opt.dictionary === 'string') {
|
||
|
// If we need to compress text, change encoding to utf8.
|
||
|
dict = strings.string2buf(opt.dictionary);
|
||
|
} else if (toString.call(opt.dictionary) === '[object ArrayBuffer]') {
|
||
|
dict = new Uint8Array(opt.dictionary);
|
||
|
} else {
|
||
|
dict = opt.dictionary;
|
||
|
}
|
||
|
|
||
|
status = zlib_deflate.deflateSetDictionary(this.strm, dict);
|
||
|
|
||
|
if (status !== Z_OK) {
|
||
|
throw new Error(msg[status]);
|
||
|
}
|
||
|
|
||
|
this._dict_set = true;
|
||
|
}
|
||
|
}
|
||
|
/**
|
||
|
* Deflate#push(data[, mode]) -> Boolean
|
||
|
* - data (Uint8Array|Array|ArrayBuffer|String): input data. Strings will be
|
||
|
* converted to utf8 byte sequence.
|
||
|
* - mode (Number|Boolean): 0..6 for corresponding Z_NO_FLUSH..Z_TREE modes.
|
||
|
* See constants. Skipped or `false` means Z_NO_FLUSH, `true` means Z_FINISH.
|
||
|
*
|
||
|
* Sends input data to deflate pipe, generating [[Deflate#onData]] calls with
|
||
|
* new compressed chunks. Returns `true` on success. The last data block must have
|
||
|
* mode Z_FINISH (or `true`). That will flush internal pending buffers and call
|
||
|
* [[Deflate#onEnd]]. For interim explicit flushes (without ending the stream) you
|
||
|
* can use mode Z_SYNC_FLUSH, keeping the compression context.
|
||
|
*
|
||
|
* On fail call [[Deflate#onEnd]] with error code and return false.
|
||
|
*
|
||
|
* We strongly recommend to use `Uint8Array` on input for best speed (output
|
||
|
* array format is detected automatically). Also, don't skip last param and always
|
||
|
* use the same type in your code (boolean or number). That will improve JS speed.
|
||
|
*
|
||
|
* For regular `Array`-s make sure all elements are [0..255].
|
||
|
*
|
||
|
* ##### Example
|
||
|
*
|
||
|
* ```javascript
|
||
|
* push(chunk, false); // push one of data chunks
|
||
|
* ...
|
||
|
* push(chunk, true); // push last chunk
|
||
|
* ```
|
||
|
**/
|
||
|
|
||
|
|
||
|
Deflate.prototype.push = function (data, mode) {
|
||
|
var strm = this.strm;
|
||
|
var chunkSize = this.options.chunkSize;
|
||
|
|
||
|
var status, _mode;
|
||
|
|
||
|
if (this.ended) {
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
_mode = mode === ~~mode ? mode : mode === true ? Z_FINISH : Z_NO_FLUSH; // Convert data if needed
|
||
|
|
||
|
if (typeof data === 'string') {
|
||
|
// If we need to compress text, change encoding to utf8.
|
||
|
strm.input = strings.string2buf(data);
|
||
|
} else if (toString.call(data) === '[object ArrayBuffer]') {
|
||
|
strm.input = new Uint8Array(data);
|
||
|
} else {
|
||
|
strm.input = data;
|
||
|
}
|
||
|
|
||
|
strm.next_in = 0;
|
||
|
strm.avail_in = strm.input.length;
|
||
|
|
||
|
do {
|
||
|
if (strm.avail_out === 0) {
|
||
|
strm.output = new utils.Buf8(chunkSize);
|
||
|
strm.next_out = 0;
|
||
|
strm.avail_out = chunkSize;
|
||
|
}
|
||
|
|
||
|
status = zlib_deflate.deflate(strm, _mode);
|
||
|
/* no bad return value */
|
||
|
|
||
|
if (status !== Z_STREAM_END && status !== Z_OK) {
|
||
|
this.onEnd(status);
|
||
|
this.ended = true;
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
if (strm.avail_out === 0 || strm.avail_in === 0 && (_mode === Z_FINISH || _mode === Z_SYNC_FLUSH)) {
|
||
|
if (this.options.to === 'string') {
|
||
|
this.onData(strings.buf2binstring(utils.shrinkBuf(strm.output, strm.next_out)));
|
||
|
} else {
|
||
|
this.onData(utils.shrinkBuf(strm.output, strm.next_out));
|
||
|
}
|
||
|
}
|
||
|
} while ((strm.avail_in > 0 || strm.avail_out === 0) && status !== Z_STREAM_END); // Finalize on the last chunk.
|
||
|
|
||
|
|
||
|
if (_mode === Z_FINISH) {
|
||
|
status = zlib_deflate.deflateEnd(this.strm);
|
||
|
this.onEnd(status);
|
||
|
this.ended = true;
|
||
|
return status === Z_OK;
|
||
|
} // callback interim results if Z_SYNC_FLUSH.
|
||
|
|
||
|
|
||
|
if (_mode === Z_SYNC_FLUSH) {
|
||
|
this.onEnd(Z_OK);
|
||
|
strm.avail_out = 0;
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
return true;
|
||
|
};
|
||
|
/**
|
||
|
* Deflate#onData(chunk) -> Void
|
||
|
* - chunk (Uint8Array|Array|String): output data. Type of array depends
|
||
|
* on js engine support. When string output requested, each chunk
|
||
|
* will be string.
|
||
|
*
|
||
|
* By default, stores data blocks in `chunks[]` property and glue
|
||
|
* those in `onEnd`. Override this handler, if you need another behaviour.
|
||
|
**/
|
||
|
|
||
|
|
||
|
Deflate.prototype.onData = function (chunk) {
|
||
|
this.chunks.push(chunk);
|
||
|
};
|
||
|
/**
|
||
|
* Deflate#onEnd(status) -> Void
|
||
|
* - status (Number): deflate status. 0 (Z_OK) on success,
|
||
|
* other if not.
|
||
|
*
|
||
|
* Called once after you tell deflate that the input stream is
|
||
|
* complete (Z_FINISH) or should be flushed (Z_SYNC_FLUSH)
|
||
|
* or if an error happened. By default - join collected chunks,
|
||
|
* free memory and fill `results` / `err` properties.
|
||
|
**/
|
||
|
|
||
|
|
||
|
Deflate.prototype.onEnd = function (status) {
|
||
|
// On success - join
|
||
|
if (status === Z_OK) {
|
||
|
if (this.options.to === 'string') {
|
||
|
this.result = this.chunks.join('');
|
||
|
} else {
|
||
|
this.result = utils.flattenChunks(this.chunks);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
this.chunks = [];
|
||
|
this.err = status;
|
||
|
this.msg = this.strm.msg;
|
||
|
};
|
||
|
/**
|
||
|
* deflate(data[, options]) -> Uint8Array|Array|String
|
||
|
* - data (Uint8Array|Array|String): input data to compress.
|
||
|
* - options (Object): zlib deflate options.
|
||
|
*
|
||
|
* Compress `data` with deflate algorithm and `options`.
|
||
|
*
|
||
|
* Supported options are:
|
||
|
*
|
||
|
* - level
|
||
|
* - windowBits
|
||
|
* - memLevel
|
||
|
* - strategy
|
||
|
* - dictionary
|
||
|
*
|
||
|
* [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)
|
||
|
* for more information on these.
|
||
|
*
|
||
|
* Sugar (options):
|
||
|
*
|
||
|
* - `raw` (Boolean) - say that we work with raw stream, if you don't wish to specify
|
||
|
* negative windowBits implicitly.
|
||
|
* - `to` (String) - if equal to 'string', then result will be "binary string"
|
||
|
* (each char code [0..255])
|
||
|
*
|
||
|
* ##### Example:
|
||
|
*
|
||
|
* ```javascript
|
||
|
* var pako = require('pako')
|
||
|
* , data = Uint8Array([1,2,3,4,5,6,7,8,9]);
|
||
|
*
|
||
|
* console.log(pako.deflate(data));
|
||
|
* ```
|
||
|
**/
|
||
|
|
||
|
|
||
|
function deflate(input, options) {
|
||
|
var deflator = new Deflate(options);
|
||
|
deflator.push(input, true); // That will never happens, if you don't cheat with options :)
|
||
|
|
||
|
if (deflator.err) {
|
||
|
throw deflator.msg || msg[deflator.err];
|
||
|
}
|
||
|
|
||
|
return deflator.result;
|
||
|
}
|
||
|
/**
|
||
|
* deflateRaw(data[, options]) -> Uint8Array|Array|String
|
||
|
* - data (Uint8Array|Array|String): input data to compress.
|
||
|
* - options (Object): zlib deflate options.
|
||
|
*
|
||
|
* The same as [[deflate]], but creates raw data, without wrapper
|
||
|
* (header and adler32 crc).
|
||
|
**/
|
||
|
|
||
|
|
||
|
function deflateRaw(input, options) {
|
||
|
options = options || {};
|
||
|
options.raw = true;
|
||
|
return deflate(input, options);
|
||
|
}
|
||
|
/**
|
||
|
* gzip(data[, options]) -> Uint8Array|Array|String
|
||
|
* - data (Uint8Array|Array|String): input data to compress.
|
||
|
* - options (Object): zlib deflate options.
|
||
|
*
|
||
|
* The same as [[deflate]], but create gzip wrapper instead of
|
||
|
* deflate one.
|
||
|
**/
|
||
|
|
||
|
|
||
|
function gzip(input, options) {
|
||
|
options = options || {};
|
||
|
options.gzip = true;
|
||
|
return deflate(input, options);
|
||
|
}
|
||
|
|
||
|
exports.Deflate = Deflate;
|
||
|
exports.deflate = deflate;
|
||
|
exports.deflateRaw = deflateRaw;
|
||
|
exports.gzip = gzip;
|
||
|
return exports;
|
||
|
}
|