# All files / node_modules/upng-js/node_modules/pako/lib/zlib constants.js

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     'use strict';

    // (C) 1995-2013 Jean-loup Gailly and Mark Adler
    // (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
    //
    // This software is provided 'as-is', without any express or implied
    // warranty. In no event will the authors be held liable for any damages
    // arising from the use of this software.
    //
    // Permission is granted to anyone to use this software for any purpose,
    // including commercial applications, and to alter it and redistribute it
    // freely, subject to the following restrictions:
    //
    // 1. The origin of this software must not be misrepresented; you must not
    //   claim that you wrote the original software. If you use this software
    //   in a product, an acknowledgment in the product documentation would be
    //   appreciated but is not required.
    // 2. Altered source versions must be plainly marked as such, and must not be
    //   misrepresented as being the original software.
    // 3. This notice may not be removed or altered from any source distribution.

    module.exports = {

      /* Allowed flush values; see deflate() and inflate() below for details */
      Z_NO_FLUSH:         0,
      Z_PARTIAL_FLUSH:    1,
      Z_SYNC_FLUSH:       2,
      Z_FULL_FLUSH:       3,
      Z_FINISH:           4,
      Z_BLOCK:            5,
      Z_TREES:            6,

      /* Return codes for the compression/decompression functions. Negative values
      * are errors, positive values are used for special but normal events.
      */
      Z_OK:               0,
      Z_STREAM_END:       1,
      Z_NEED_DICT:        2,
      Z_ERRNO:           -1,
      Z_STREAM_ERROR:    -2,
      Z_DATA_ERROR:      -3,
      //Z_MEM_ERROR:     -4,
      Z_BUF_ERROR:       -5,
      //Z_VERSION_ERROR: -6,

      /* compression levels */
      Z_NO_COMPRESSION:         0,
      Z_BEST_SPEED:             1,
      Z_BEST_COMPRESSION:       9,
      Z_DEFAULT_COMPRESSION:   -1,

      Z_FILTERED:               1,
      Z_HUFFMAN_ONLY:           2,
      Z_RLE:                    3,
      Z_FIXED:                  4,
      Z_DEFAULT_STRATEGY:       0,

      /* Possible values of the data_type field (though see inflate()) */
      Z_BINARY:                 0,
      Z_TEXT:                   1,
      //Z_ASCII:                1, // = Z_TEXT (deprecated)
      Z_UNKNOWN:                2,

      /* The deflate compression method */
      Z_DEFLATED:               8
      //Z_NULL:                 null // Use -1 or null inline, depending on var type
    };