'use strict';

var deflate = require('../../../_virtual/deflate.js');
var deflate$1 = require('./zlib/deflate.js');
var common = require('./utils/common.js');
var strings = require('./utils/strings.js');
var messages = require('./zlib/messages.js');
var zstream = require('./zlib/zstream.js');

var hasRequiredDeflate;

function requireDeflate () {
	if (hasRequiredDeflate) return deflate.__exports;
	hasRequiredDeflate = 1;


	var zlib_deflate = deflate$1.__require();
	var utils        = common.__require();
	var strings$1      = strings.__require();
	var msg          = messages.__require();
	var ZStream      = zstream.__require();

	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$1.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$1.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$1.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$2(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$2(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$2(input, options);
	}


	deflate.__exports.Deflate = Deflate;
	deflate.__exports.deflate = deflate$2;
	deflate.__exports.deflateRaw = deflateRaw;
	deflate.__exports.gzip = gzip;
	return deflate.__exports;
}

exports.__require = requireDeflate;
