# All files / node_modules/upng-js/node_modules/pako/lib inflate.js

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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) {
    I  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.
    I  if (opt.raw && (opt.windowBits >= 0) && (opt.windowBits < 16)) {
        opt.windowBits = -opt.windowBits;
    I    if (opt.windowBits === 0) { opt.windowBits = -15; }
      }

      // If `windowBits` not defined (and mode not raw) - set autodetect flag for gzip/deflate
    I  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
    I  if ((opt.windowBits > 15) && (opt.windowBits < 48)) {
        // bit 3 (16) -> gzipped data
        // bit 4 (32) -> autodetect gzip/deflate
    I    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
      );

    I  if (status !== c.Z_OK) {
        throw new Error(msg[status]);
      }

      this.header = new GZheader();

      zlib_inflate.inflateGetHeader(this.strm, this.header);

      // Setup dictionary
    I  if (opt.dictionary) {
        // Convert data if needed
        if (typeof opt.dictionary === 'string') {
          opt.dictionary = strings.string2buf(opt.dictionary);
        } Ielse if (toString.call(opt.dictionary) === '[object ArrayBuffer]') {
          opt.dictionary = new Uint8Array(opt.dictionary);
        }
    I    if (opt.raw) { //In raw mode we need to set the dictionary early
          status = zlib_inflate.inflateSetDictionary(this.strm, opt.dictionary);
    I      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;

    I  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 {
    I    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 */

    I    if (status === c.Z_NEED_DICT && dictionary) {
          status = zlib_inflate.inflateSetDictionary(this.strm, dictionary);
        }

    I    if (status === c.Z_BUF_ERROR && allowBufError === true) {
          status = c.Z_OK;
          allowBufError = false;
        }

    I    if (status !== c.Z_STREAM_END && status !== c.Z_OK) {
          this.onEnd(status);
          this.ended = true;
          return false;
        }

    I    if (strm.next_out) {
    I      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;
    I          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.
    I    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);

    I  if (status === c.Z_STREAM_END) {
        _mode = c.Z_FINISH;
      }

      // Finalize on the last chunk.
    I  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.
    I  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
    I  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 :)
    I  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;