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Diffstat (limited to 'node_modules/browserify-zlib/src/binding.js')
| -rw-r--r-- | node_modules/browserify-zlib/src/binding.js | 432 |
1 files changed, 0 insertions, 432 deletions
diff --git a/node_modules/browserify-zlib/src/binding.js b/node_modules/browserify-zlib/src/binding.js deleted file mode 100644 index 14e419d..0000000 --- a/node_modules/browserify-zlib/src/binding.js +++ /dev/null @@ -1,432 +0,0 @@ -'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 |