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-'use strict';
-
-
-var zlib_inflate = require('./zlib/inflate');
-var utils = require('./utils/common');
-var strings = require('./utils/strings');
-var c = require('./zlib/constants');
-var msg = require('./zlib/messages');
-var ZStream = require('./zlib/zstream');
-var GZheader = require('./zlib/gzheader');
-
-var toString = Object.prototype.toString;
-
-/**
- * class Inflate
- *
- * Generic JS-style wrapper for zlib calls. If you don't need
- * streaming behaviour - use more simple functions: [[inflate]]
- * and [[inflateRaw]].
- **/
-
-/* internal
- * inflate.chunks -> Array
- *
- * Chunks of output data, if [[Inflate#onData]] not overridden.
- **/
-
-/**
- * Inflate.result -> Uint8Array|Array|String
- *
- * Uncompressed result, generated by default [[Inflate#onData]]
- * and [[Inflate#onEnd]] handlers. Filled after you push last chunk
- * (call [[Inflate#push]] with `Z_FINISH` / `true` param) or if you
- * push a chunk with explicit flush (call [[Inflate#push]] with
- * `Z_SYNC_FLUSH` param).
- **/
-
-/**
- * Inflate.err -> Number
- *
- * Error code after inflate finished. 0 (Z_OK) on success.
- * Should be checked if broken data possible.
- **/
-
-/**
- * Inflate.msg -> String
- *
- * Error message, if [[Inflate.err]] != 0
- **/
-
-
-/**
- * new Inflate(options)
- * - options (Object): zlib inflate options.
- *
- * Creates new inflator instance with specified params. Throws exception
- * on bad params. Supported options:
- *
- * - `windowBits`
- * - `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 inflate
- * - `to` (String) - if equal to 'string', then result will be converted
- * from utf8 to utf16 (javascript) string. When string output requested,
- * chunk length can differ from `chunkSize`, depending on content.
- *
- * By default, when no options set, autodetect deflate/gzip data format via
- * wrapper header.
- *
- * ##### 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 inflate = new pako.Inflate({ level: 3});
- *
- * inflate.push(chunk1, false);
- * inflate.push(chunk2, true); // true -> last chunk
- *
- * if (inflate.err) { throw new Error(inflate.err); }
- *
- * console.log(inflate.result);
- * ```
- **/
-function Inflate(options) {
- if (!(this instanceof Inflate)) return new Inflate(options);
-
- this.options = utils.assign({
- chunkSize: 16384,
- windowBits: 0,
- to: ''
- }, options || {});
-
- var opt = this.options;
-
- // Force window size for `raw` data, if not set directly,
- // because we have no header for autodetect.
- if (opt.raw && (opt.windowBits >= 0) && (opt.windowBits < 16)) {
- opt.windowBits = -opt.windowBits;
- if (opt.windowBits === 0) { opt.windowBits = -15; }
- }
-
- // If `windowBits` not defined (and mode not raw) - set autodetect flag for gzip/deflate
- if ((opt.windowBits >= 0) && (opt.windowBits < 16) &&
- !(options && options.windowBits)) {
- opt.windowBits += 32;
- }
-
- // Gzip header has no info about windows size, we can do autodetect only
- // for deflate. So, if window size not set, force it to max when gzip possible
- if ((opt.windowBits > 15) && (opt.windowBits < 48)) {
- // bit 3 (16) -> gzipped data
- // bit 4 (32) -> autodetect gzip/deflate
- if ((opt.windowBits & 15) === 0) {
- opt.windowBits |= 15;
- }
- }
-
- 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_inflate.inflateInit2(
- this.strm,
- opt.windowBits
- );
-
- if (status !== c.Z_OK) {
- throw new Error(msg[status]);
- }
-
- this.header = new GZheader();
-
- zlib_inflate.inflateGetHeader(this.strm, this.header);
-
- // Setup dictionary
- if (opt.dictionary) {
- // Convert data if needed
- if (typeof opt.dictionary === 'string') {
- opt.dictionary = strings.string2buf(opt.dictionary);
- } else if (toString.call(opt.dictionary) === '[object ArrayBuffer]') {
- opt.dictionary = new Uint8Array(opt.dictionary);
- }
- if (opt.raw) { //In raw mode we need to set the dictionary early
- status = zlib_inflate.inflateSetDictionary(this.strm, opt.dictionary);
- if (status !== c.Z_OK) {
- throw new Error(msg[status]);
- }
- }
- }
-}
-
-/**
- * Inflate#push(data[, mode]) -> Boolean
- * - data (Uint8Array|Array|ArrayBuffer|String): input data
- * - 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 inflate pipe, generating [[Inflate#onData]] calls with
- * new output chunks. Returns `true` on success. The last data block must have
- * mode Z_FINISH (or `true`). That will flush internal pending buffers and call
- * [[Inflate#onEnd]]. For interim explicit flushes (without ending the stream) you
- * can use mode Z_SYNC_FLUSH, keeping the decompression context.
- *
- * On fail call [[Inflate#onEnd]] with error code and return false.
- *
- * We strongly recommend to use `Uint8Array` on input for best speed (output
- * 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
- * ```
- **/
-Inflate.prototype.push = function (data, mode) {
- var strm = this.strm;
- var chunkSize = this.options.chunkSize;
- var dictionary = this.options.dictionary;
- var status, _mode;
- var next_out_utf8, tail, utf8str;
-
- // Flag to properly process Z_BUF_ERROR on testing inflate call
- // when we check that all output data was flushed.
- var allowBufError = false;
-
- if (this.ended) { return false; }
- _mode = (mode === ~~mode) ? mode : ((mode === true) ? c.Z_FINISH : c.Z_NO_FLUSH);
-
- // Convert data if needed
- if (typeof data === 'string') {
- // Only binary strings can be decompressed on practice
- strm.input = strings.binstring2buf(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_inflate.inflate(strm, c.Z_NO_FLUSH); /* no bad return value */
-
- if (status === c.Z_NEED_DICT && dictionary) {
- status = zlib_inflate.inflateSetDictionary(this.strm, dictionary);
- }
-
- if (status === c.Z_BUF_ERROR && allowBufError === true) {
- status = c.Z_OK;
- allowBufError = false;
- }
-
- if (status !== c.Z_STREAM_END && status !== c.Z_OK) {
- this.onEnd(status);
- this.ended = true;
- return false;
- }
-
- if (strm.next_out) {
- if (strm.avail_out === 0 || status === c.Z_STREAM_END || (strm.avail_in === 0 && (_mode === c.Z_FINISH || _mode === c.Z_SYNC_FLUSH))) {
-
- if (this.options.to === 'string') {
-
- next_out_utf8 = strings.utf8border(strm.output, strm.next_out);
-
- tail = strm.next_out - next_out_utf8;
- utf8str = strings.buf2string(strm.output, next_out_utf8);
-
- // move tail
- strm.next_out = tail;
- strm.avail_out = chunkSize - tail;
- if (tail) { utils.arraySet(strm.output, strm.output, next_out_utf8, tail, 0); }
-
- this.onData(utf8str);
-
- } else {
- this.onData(utils.shrinkBuf(strm.output, strm.next_out));
- }
- }
- }
-
- // When no more input data, we should check that internal inflate buffers
- // are flushed. The only way to do it when avail_out = 0 - run one more
- // inflate pass. But if output data not exists, inflate return Z_BUF_ERROR.
- // Here we set flag to process this error properly.
- //
- // NOTE. Deflate does not return error in this case and does not needs such
- // logic.
- if (strm.avail_in === 0 && strm.avail_out === 0) {
- allowBufError = true;
- }
-
- } while ((strm.avail_in > 0 || strm.avail_out === 0) && status !== c.Z_STREAM_END);
-
- if (status === c.Z_STREAM_END) {
- _mode = c.Z_FINISH;
- }
-
- // Finalize on the last chunk.
- if (_mode === c.Z_FINISH) {
- status = zlib_inflate.inflateEnd(this.strm);
- this.onEnd(status);
- this.ended = true;
- return status === c.Z_OK;
- }
-
- // callback interim results if Z_SYNC_FLUSH.
- if (_mode === c.Z_SYNC_FLUSH) {
- this.onEnd(c.Z_OK);
- strm.avail_out = 0;
- return true;
- }
-
- return true;
-};
-
-
-/**
- * Inflate#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.
- **/
-Inflate.prototype.onData = function (chunk) {
- this.chunks.push(chunk);
-};
-
-
-/**
- * Inflate#onEnd(status) -> Void
- * - status (Number): inflate status. 0 (Z_OK) on success,
- * other if not.
- *
- * Called either after you tell inflate 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.
- **/
-Inflate.prototype.onEnd = function (status) {
- // On success - join
- if (status === c.Z_OK) {
- if (this.options.to === 'string') {
- // Glue & convert here, until we teach pako to send
- // utf8 aligned strings to onData
- this.result = this.chunks.join('');
- } else {
- this.result = utils.flattenChunks(this.chunks);
- }
- }
- this.chunks = [];
- this.err = status;
- this.msg = this.strm.msg;
-};
-
-
-/**
- * inflate(data[, options]) -> Uint8Array|Array|String
- * - data (Uint8Array|Array|String): input data to decompress.
- * - options (Object): zlib inflate options.
- *
- * Decompress `data` with inflate/ungzip and `options`. Autodetect
- * format via wrapper header by default. That's why we don't provide
- * separate `ungzip` method.
- *
- * Supported options are:
- *
- * - windowBits
- *
- * [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)
- * for more information.
- *
- * 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 converted
- * from utf8 to utf16 (javascript) string. When string output requested,
- * chunk length can differ from `chunkSize`, depending on content.
- *
- *
- * ##### Example:
- *
- * ```javascript
- * var pako = require('pako')
- * , input = pako.deflate([1,2,3,4,5,6,7,8,9])
- * , output;
- *
- * try {
- * output = pako.inflate(input);
- * } catch (err)
- * console.log(err);
- * }
- * ```
- **/
-function inflate(input, options) {
- var inflator = new Inflate(options);
-
- inflator.push(input, true);
-
- // That will never happens, if you don't cheat with options :)
- if (inflator.err) { throw inflator.msg || msg[inflator.err]; }
-
- return inflator.result;
-}
-
-
-/**
- * inflateRaw(data[, options]) -> Uint8Array|Array|String
- * - data (Uint8Array|Array|String): input data to decompress.
- * - options (Object): zlib inflate options.
- *
- * The same as [[inflate]], but creates raw data, without wrapper
- * (header and adler32 crc).
- **/
-function inflateRaw(input, options) {
- options = options || {};
- options.raw = true;
- return inflate(input, options);
-}
-
-
-/**
- * ungzip(data[, options]) -> Uint8Array|Array|String
- * - data (Uint8Array|Array|String): input data to decompress.
- * - options (Object): zlib inflate options.
- *
- * Just shortcut to [[inflate]], because it autodetects format
- * by header.content. Done for convenience.
- **/
-
-
-exports.Inflate = Inflate;
-exports.inflate = inflate;
-exports.inflateRaw = inflateRaw;
-exports.ungzip = inflate;
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