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node_modules/rollup-plugin-node-polyfills/polyfills/zlib-lib/binding.js
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269
node_modules/rollup-plugin-node-polyfills/polyfills/zlib-lib/binding.js
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import msg from './messages';
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import zstream from './zstream';
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import {deflateInit2, deflateEnd, deflateReset, deflate} from './deflate';
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import {inflateInit2, inflate, inflateEnd, inflateReset} from './inflate';
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// import constants from './constants';
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// zlib modes
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export var NONE = 0;
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export var DEFLATE = 1;
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export var INFLATE = 2;
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export var GZIP = 3;
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export var GUNZIP = 4;
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export var DEFLATERAW = 5;
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export var INFLATERAW = 6;
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export var UNZIP = 7;
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export var Z_NO_FLUSH= 0,
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Z_PARTIAL_FLUSH= 1,
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Z_SYNC_FLUSH= 2,
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Z_FULL_FLUSH= 3,
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Z_FINISH= 4,
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Z_BLOCK= 5,
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Z_TREES= 6,
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/* Return codes for the compression/decompression functions. Negative values
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* are errors, positive values are used for special but normal events.
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*/
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Z_OK= 0,
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Z_STREAM_END= 1,
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Z_NEED_DICT= 2,
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Z_ERRNO= -1,
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Z_STREAM_ERROR= -2,
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Z_DATA_ERROR= -3,
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//Z_MEM_ERROR: -4,
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Z_BUF_ERROR= -5,
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//Z_VERSION_ERROR: -6,
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/* compression levels */
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Z_NO_COMPRESSION= 0,
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Z_BEST_SPEED= 1,
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Z_BEST_COMPRESSION= 9,
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Z_DEFAULT_COMPRESSION= -1,
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Z_FILTERED= 1,
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Z_HUFFMAN_ONLY= 2,
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Z_RLE= 3,
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Z_FIXED= 4,
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Z_DEFAULT_STRATEGY= 0,
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/* Possible values of the data_type field (though see inflate()) */
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Z_BINARY= 0,
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Z_TEXT= 1,
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//Z_ASCII: 1, // = Z_TEXT (deprecated)
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Z_UNKNOWN= 2,
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/* The deflate compression method */
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Z_DEFLATED= 8;
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export function Zlib(mode) {
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if (mode < DEFLATE || mode > UNZIP)
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throw new TypeError('Bad argument');
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this.mode = mode;
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this.init_done = false;
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this.write_in_progress = false;
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this.pending_close = false;
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this.windowBits = 0;
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this.level = 0;
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this.memLevel = 0;
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this.strategy = 0;
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this.dictionary = null;
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}
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Zlib.prototype.init = function(windowBits, level, memLevel, strategy, dictionary) {
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this.windowBits = windowBits;
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this.level = level;
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this.memLevel = memLevel;
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this.strategy = strategy;
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// dictionary not supported.
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if (this.mode === GZIP || this.mode === GUNZIP)
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this.windowBits += 16;
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if (this.mode === UNZIP)
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this.windowBits += 32;
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if (this.mode === DEFLATERAW || this.mode === INFLATERAW)
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this.windowBits = -this.windowBits;
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this.strm = new zstream();
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var status;
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switch (this.mode) {
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case DEFLATE:
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case GZIP:
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case DEFLATERAW:
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status = deflateInit2(
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this.strm,
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this.level,
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Z_DEFLATED,
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this.windowBits,
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this.memLevel,
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this.strategy
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);
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break;
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case INFLATE:
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case GUNZIP:
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case INFLATERAW:
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case UNZIP:
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status = inflateInit2(
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this.strm,
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this.windowBits
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);
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break;
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default:
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throw new Error('Unknown mode ' + this.mode);
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}
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if (status !== Z_OK) {
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this._error(status);
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return;
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}
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this.write_in_progress = false;
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this.init_done = true;
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};
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Zlib.prototype.params = function() {
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throw new Error('deflateParams Not supported');
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};
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Zlib.prototype._writeCheck = function() {
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if (!this.init_done)
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throw new Error('write before init');
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if (this.mode === NONE)
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throw new Error('already finalized');
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if (this.write_in_progress)
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throw new Error('write already in progress');
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if (this.pending_close)
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throw new Error('close is pending');
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};
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Zlib.prototype.write = function(flush, input, in_off, in_len, out, out_off, out_len) {
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this._writeCheck();
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this.write_in_progress = true;
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var self = this;
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process.nextTick(function() {
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self.write_in_progress = false;
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var res = self._write(flush, input, in_off, in_len, out, out_off, out_len);
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self.callback(res[0], res[1]);
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if (self.pending_close)
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self.close();
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});
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return this;
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};
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// set method for Node buffers, used by pako
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function bufferSet(data, offset) {
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for (var i = 0; i < data.length; i++) {
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this[offset + i] = data[i];
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}
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}
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Zlib.prototype.writeSync = function(flush, input, in_off, in_len, out, out_off, out_len) {
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this._writeCheck();
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return this._write(flush, input, in_off, in_len, out, out_off, out_len);
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};
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Zlib.prototype._write = function(flush, input, in_off, in_len, out, out_off, out_len) {
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this.write_in_progress = true;
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if (flush !== Z_NO_FLUSH &&
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flush !== Z_PARTIAL_FLUSH &&
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flush !== Z_SYNC_FLUSH &&
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flush !== Z_FULL_FLUSH &&
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flush !== Z_FINISH &&
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flush !== Z_BLOCK) {
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throw new Error('Invalid flush value');
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}
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if (input == null) {
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input = new Buffer(0);
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in_len = 0;
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in_off = 0;
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}
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if (out._set)
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out.set = out._set;
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else
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out.set = bufferSet;
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var strm = this.strm;
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strm.avail_in = in_len;
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strm.input = input;
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strm.next_in = in_off;
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strm.avail_out = out_len;
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strm.output = out;
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strm.next_out = out_off;
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var status;
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switch (this.mode) {
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case DEFLATE:
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case GZIP:
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case DEFLATERAW:
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status = deflate(strm, flush);
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break;
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case UNZIP:
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case INFLATE:
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case GUNZIP:
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case INFLATERAW:
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status = inflate(strm, flush);
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break;
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default:
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throw new Error('Unknown mode ' + this.mode);
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}
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if (status !== Z_STREAM_END && status !== Z_OK) {
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this._error(status);
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}
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this.write_in_progress = false;
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return [strm.avail_in, strm.avail_out];
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};
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Zlib.prototype.close = function() {
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if (this.write_in_progress) {
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this.pending_close = true;
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return;
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}
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this.pending_close = false;
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if (this.mode === DEFLATE || this.mode === GZIP || this.mode === DEFLATERAW) {
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deflateEnd(this.strm);
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} else {
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inflateEnd(this.strm);
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}
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this.mode = NONE;
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};
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var status
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Zlib.prototype.reset = function() {
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switch (this.mode) {
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case DEFLATE:
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case DEFLATERAW:
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status = deflateReset(this.strm);
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break;
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case INFLATE:
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case INFLATERAW:
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status = inflateReset(this.strm);
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break;
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}
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if (status !== Z_OK) {
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this._error(status);
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}
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};
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Zlib.prototype._error = function(status) {
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this.onerror(msg[status] + ': ' + this.strm.msg, status);
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this.write_in_progress = false;
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if (this.pending_close)
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this.close();
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};
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