diff options
author | 2020-11-16 00:10:28 +0100 | |
---|---|---|
committer | 2020-11-16 00:10:28 +0100 | |
commit | e06ec920f7a5d784e674c4c4b4e6d1da3dc7391d (patch) | |
tree | 55713f725f77b44ebfec86e4eec3ce33e71458ca /node_modules/browserify-zlib/lib/binding.js | |
download | website_creator-e06ec920f7a5d784e674c4c4b4e6d1da3dc7391d.tar.gz website_creator-e06ec920f7a5d784e674c4c4b4e6d1da3dc7391d.tar.bz2 website_creator-e06ec920f7a5d784e674c4c4b4e6d1da3dc7391d.zip |
api, login, auth
Diffstat (limited to 'node_modules/browserify-zlib/lib/binding.js')
-rw-r--r-- | node_modules/browserify-zlib/lib/binding.js | 409 |
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 new file mode 100644 index 0000000..e0578b3 --- /dev/null +++ b/node_modules/browserify-zlib/lib/binding.js @@ -0,0 +1,409 @@ +'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 |