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Diffstat (limited to 'node_modules/browserify-zlib/lib/binding.js')
| -rw-r--r-- | node_modules/browserify-zlib/lib/binding.js | 409 |
1 files changed, 0 insertions, 409 deletions
diff --git a/node_modules/browserify-zlib/lib/binding.js b/node_modules/browserify-zlib/lib/binding.js deleted file mode 100644 index e0578b3..0000000 --- a/node_modules/browserify-zlib/lib/binding.js +++ /dev/null @@ -1,409 +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;
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