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authorGravatar Piotr Russ <mail@pruss.it> 2020-11-16 00:10:28 +0100
committerGravatar Piotr Russ <mail@pruss.it> 2020-11-16 00:10:28 +0100
commite06ec920f7a5d784e674c4c4b4e6d1da3dc7391d (patch)
tree55713f725f77b44ebfec86e4eec3ce33e71458ca /node_modules/browserify-zlib/lib/binding.js
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Diffstat (limited to 'node_modules/browserify-zlib/lib/binding.js')
-rw-r--r--node_modules/browserify-zlib/lib/binding.js409
1 files changed, 409 insertions, 0 deletions
diff --git a/node_modules/browserify-zlib/lib/binding.js b/node_modules/browserify-zlib/lib/binding.js
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+'use strict';
+/* eslint camelcase: "off" */
+
+var assert = require('assert');
+
+var Zstream = require('pako/lib/zlib/zstream');
+var zlib_deflate = require('pako/lib/zlib/deflate.js');
+var zlib_inflate = require('pako/lib/zlib/inflate.js');
+var constants = require('pako/lib/zlib/constants');
+
+for (var key in constants) {
+ exports[key] = constants[key];
+}
+
+// zlib modes
+exports.NONE = 0;
+exports.DEFLATE = 1;
+exports.INFLATE = 2;
+exports.GZIP = 3;
+exports.GUNZIP = 4;
+exports.DEFLATERAW = 5;
+exports.INFLATERAW = 6;
+exports.UNZIP = 7;
+
+var GZIP_HEADER_ID1 = 0x1f;
+var GZIP_HEADER_ID2 = 0x8b;
+
+/**
+ * Emulate Node's zlib C++ layer for use by the JS layer in index.js
+ */
+function Zlib(mode) {
+ if (typeof mode !== 'number' || mode < exports.DEFLATE || mode > exports.UNZIP) {
+ throw new TypeError('Bad argument');
+ }
+
+ this.dictionary = null;
+ this.err = 0;
+ this.flush = 0;
+ this.init_done = false;
+ this.level = 0;
+ this.memLevel = 0;
+ this.mode = mode;
+ this.strategy = 0;
+ this.windowBits = 0;
+ this.write_in_progress = false;
+ this.pending_close = false;
+ this.gzip_id_bytes_read = 0;
+}
+
+Zlib.prototype.close = function () {
+ if (this.write_in_progress) {
+ this.pending_close = true;
+ return;
+ }
+
+ this.pending_close = false;
+
+ assert(this.init_done, 'close before init');
+ assert(this.mode <= exports.UNZIP);
+
+ if (this.mode === exports.DEFLATE || this.mode === exports.GZIP || this.mode === exports.DEFLATERAW) {
+ zlib_deflate.deflateEnd(this.strm);
+ } else if (this.mode === exports.INFLATE || this.mode === exports.GUNZIP || this.mode === exports.INFLATERAW || this.mode === exports.UNZIP) {
+ zlib_inflate.inflateEnd(this.strm);
+ }
+
+ this.mode = exports.NONE;
+
+ this.dictionary = null;
+};
+
+Zlib.prototype.write = function (flush, input, in_off, in_len, out, out_off, out_len) {
+ return this._write(true, flush, input, in_off, in_len, out, out_off, out_len);
+};
+
+Zlib.prototype.writeSync = function (flush, input, in_off, in_len, out, out_off, out_len) {
+ return this._write(false, flush, input, in_off, in_len, out, out_off, out_len);
+};
+
+Zlib.prototype._write = function (async, flush, input, in_off, in_len, out, out_off, out_len) {
+ assert.equal(arguments.length, 8);
+
+ assert(this.init_done, 'write before init');
+ assert(this.mode !== exports.NONE, 'already finalized');
+ assert.equal(false, this.write_in_progress, 'write already in progress');
+ assert.equal(false, this.pending_close, 'close is pending');
+
+ this.write_in_progress = true;
+
+ assert.equal(false, flush === undefined, 'must provide flush value');
+
+ this.write_in_progress = true;
+
+ if (flush !== exports.Z_NO_FLUSH && flush !== exports.Z_PARTIAL_FLUSH && flush !== exports.Z_SYNC_FLUSH && flush !== exports.Z_FULL_FLUSH && flush !== exports.Z_FINISH && flush !== exports.Z_BLOCK) {
+ throw new Error('Invalid flush value');
+ }
+
+ if (input == null) {
+ input = Buffer.alloc(0);
+ in_len = 0;
+ in_off = 0;
+ }
+
+ this.strm.avail_in = in_len;
+ this.strm.input = input;
+ this.strm.next_in = in_off;
+ this.strm.avail_out = out_len;
+ this.strm.output = out;
+ this.strm.next_out = out_off;
+ this.flush = flush;
+
+ if (!async) {
+ // sync version
+ this._process();
+
+ if (this._checkError()) {
+ return this._afterSync();
+ }
+ return;
+ }
+
+ // async version
+ var self = this;
+ process.nextTick(function () {
+ self._process();
+ self._after();
+ });
+
+ return this;
+};
+
+Zlib.prototype._afterSync = function () {
+ var avail_out = this.strm.avail_out;
+ var avail_in = this.strm.avail_in;
+
+ this.write_in_progress = false;
+
+ return [avail_in, avail_out];
+};
+
+Zlib.prototype._process = function () {
+ var next_expected_header_byte = null;
+
+ // If the avail_out is left at 0, then it means that it ran out
+ // of room. If there was avail_out left over, then it means
+ // that all of the input was consumed.
+ switch (this.mode) {
+ case exports.DEFLATE:
+ case exports.GZIP:
+ case exports.DEFLATERAW:
+ this.err = zlib_deflate.deflate(this.strm, this.flush);
+ break;
+ case exports.UNZIP:
+ if (this.strm.avail_in > 0) {
+ next_expected_header_byte = this.strm.next_in;
+ }
+
+ switch (this.gzip_id_bytes_read) {
+ case 0:
+ if (next_expected_header_byte === null) {
+ break;
+ }
+
+ if (this.strm.input[next_expected_header_byte] === GZIP_HEADER_ID1) {
+ this.gzip_id_bytes_read = 1;
+ next_expected_header_byte++;
+
+ if (this.strm.avail_in === 1) {
+ // The only available byte was already read.
+ break;
+ }
+ } else {
+ this.mode = exports.INFLATE;
+ break;
+ }
+
+ // fallthrough
+ case 1:
+ if (next_expected_header_byte === null) {
+ break;
+ }
+
+ if (this.strm.input[next_expected_header_byte] === GZIP_HEADER_ID2) {
+ this.gzip_id_bytes_read = 2;
+ this.mode = exports.GUNZIP;
+ } else {
+ // There is no actual difference between INFLATE and INFLATERAW
+ // (after initialization).
+ this.mode = exports.INFLATE;
+ }
+
+ break;
+ default:
+ throw new Error('invalid number of gzip magic number bytes read');
+ }
+
+ // fallthrough
+ case exports.INFLATE:
+ case exports.GUNZIP:
+ case exports.INFLATERAW:
+ this.err = zlib_inflate.inflate(this.strm, this.flush
+
+ // If data was encoded with dictionary
+ );if (this.err === exports.Z_NEED_DICT && this.dictionary) {
+ // Load it
+ this.err = zlib_inflate.inflateSetDictionary(this.strm, this.dictionary);
+ if (this.err === exports.Z_OK) {
+ // And try to decode again
+ this.err = zlib_inflate.inflate(this.strm, this.flush);
+ } else if (this.err === exports.Z_DATA_ERROR) {
+ // Both inflateSetDictionary() and inflate() return Z_DATA_ERROR.
+ // Make it possible for After() to tell a bad dictionary from bad
+ // input.
+ this.err = exports.Z_NEED_DICT;
+ }
+ }
+ while (this.strm.avail_in > 0 && this.mode === exports.GUNZIP && this.err === exports.Z_STREAM_END && this.strm.next_in[0] !== 0x00) {
+ // Bytes remain in input buffer. Perhaps this is another compressed
+ // member in the same archive, or just trailing garbage.
+ // Trailing zero bytes are okay, though, since they are frequently
+ // used for padding.
+
+ this.reset();
+ this.err = zlib_inflate.inflate(this.strm, this.flush);
+ }
+ break;
+ default:
+ throw new Error('Unknown mode ' + this.mode);
+ }
+};
+
+Zlib.prototype._checkError = function () {
+ // Acceptable error states depend on the type of zlib stream.
+ switch (this.err) {
+ case exports.Z_OK:
+ case exports.Z_BUF_ERROR:
+ if (this.strm.avail_out !== 0 && this.flush === exports.Z_FINISH) {
+ this._error('unexpected end of file');
+ return false;
+ }
+ break;
+ case exports.Z_STREAM_END:
+ // normal statuses, not fatal
+ break;
+ case exports.Z_NEED_DICT:
+ if (this.dictionary == null) {
+ this._error('Missing dictionary');
+ } else {
+ this._error('Bad dictionary');
+ }
+ return false;
+ default:
+ // something else.
+ this._error('Zlib error');
+ return false;
+ }
+
+ return true;
+};
+
+Zlib.prototype._after = function () {
+ if (!this._checkError()) {
+ return;
+ }
+
+ var avail_out = this.strm.avail_out;
+ var avail_in = this.strm.avail_in;
+
+ this.write_in_progress = false;
+
+ // call the write() cb
+ this.callback(avail_in, avail_out);
+
+ if (this.pending_close) {
+ this.close();
+ }
+};
+
+Zlib.prototype._error = function (message) {
+ if (this.strm.msg) {
+ message = this.strm.msg;
+ }
+ this.onerror(message, this.err
+
+ // no hope of rescue.
+ );this.write_in_progress = false;
+ if (this.pending_close) {
+ this.close();
+ }
+};
+
+Zlib.prototype.init = function (windowBits, level, memLevel, strategy, dictionary) {
+ assert(arguments.length === 4 || arguments.length === 5, 'init(windowBits, level, memLevel, strategy, [dictionary])');
+
+ assert(windowBits >= 8 && windowBits <= 15, 'invalid windowBits');
+ assert(level >= -1 && level <= 9, 'invalid compression level');
+
+ assert(memLevel >= 1 && memLevel <= 9, 'invalid memlevel');
+
+ assert(strategy === exports.Z_FILTERED || strategy === exports.Z_HUFFMAN_ONLY || strategy === exports.Z_RLE || strategy === exports.Z_FIXED || strategy === exports.Z_DEFAULT_STRATEGY, 'invalid strategy');
+
+ this._init(level, windowBits, memLevel, strategy, dictionary);
+ this._setDictionary();
+};
+
+Zlib.prototype.params = function () {
+ throw new Error('deflateParams Not supported');
+};
+
+Zlib.prototype.reset = function () {
+ this._reset();
+ this._setDictionary();
+};
+
+Zlib.prototype._init = function (level, windowBits, memLevel, strategy, dictionary) {
+ this.level = level;
+ this.windowBits = windowBits;
+ this.memLevel = memLevel;
+ this.strategy = strategy;
+
+ this.flush = exports.Z_NO_FLUSH;
+
+ this.err = exports.Z_OK;
+
+ if (this.mode === exports.GZIP || this.mode === exports.GUNZIP) {
+ this.windowBits += 16;
+ }
+
+ if (this.mode === exports.UNZIP) {
+ this.windowBits += 32;
+ }
+
+ if (this.mode === exports.DEFLATERAW || this.mode === exports.INFLATERAW) {
+ this.windowBits = -1 * this.windowBits;
+ }
+
+ this.strm = new Zstream();
+
+ switch (this.mode) {
+ case exports.DEFLATE:
+ case exports.GZIP:
+ case exports.DEFLATERAW:
+ this.err = zlib_deflate.deflateInit2(this.strm, this.level, exports.Z_DEFLATED, this.windowBits, this.memLevel, this.strategy);
+ break;
+ case exports.INFLATE:
+ case exports.GUNZIP:
+ case exports.INFLATERAW:
+ case exports.UNZIP:
+ this.err = zlib_inflate.inflateInit2(this.strm, this.windowBits);
+ break;
+ default:
+ throw new Error('Unknown mode ' + this.mode);
+ }
+
+ if (this.err !== exports.Z_OK) {
+ this._error('Init error');
+ }
+
+ this.dictionary = dictionary;
+
+ this.write_in_progress = false;
+ this.init_done = true;
+};
+
+Zlib.prototype._setDictionary = function () {
+ if (this.dictionary == null) {
+ return;
+ }
+
+ this.err = exports.Z_OK;
+
+ switch (this.mode) {
+ case exports.DEFLATE:
+ case exports.DEFLATERAW:
+ this.err = zlib_deflate.deflateSetDictionary(this.strm, this.dictionary);
+ break;
+ default:
+ break;
+ }
+
+ if (this.err !== exports.Z_OK) {
+ this._error('Failed to set dictionary');
+ }
+};
+
+Zlib.prototype._reset = function () {
+ this.err = exports.Z_OK;
+
+ switch (this.mode) {
+ case exports.DEFLATE:
+ case exports.DEFLATERAW:
+ case exports.GZIP:
+ this.err = zlib_deflate.deflateReset(this.strm);
+ break;
+ case exports.INFLATE:
+ case exports.INFLATERAW:
+ case exports.GUNZIP:
+ this.err = zlib_inflate.inflateReset(this.strm);
+ break;
+ default:
+ break;
+ }
+
+ if (this.err !== exports.Z_OK) {
+ this._error('Failed to reset stream');
+ }
+};
+
+exports.Zlib = Zlib; \ No newline at end of file