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authorGravatar Piotr Russ <mail@pruss.it> 2020-11-18 23:26:45 +0100
committerGravatar Piotr Russ <mail@pruss.it> 2020-11-18 23:26:45 +0100
commit81ddf9b700bc48a1f8e472209f080f9c1d9a9b09 (patch)
tree8b959d50c5a614cbf9fcb346ed556140374d4b6d /node_modules/browserify-zlib/src/binding.js
parent1870f3fdf43707a15fda0f609a021f516f45eb63 (diff)
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-rw-r--r--node_modules/browserify-zlib/src/binding.js432
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diff --git a/node_modules/browserify-zlib/src/binding.js b/node_modules/browserify-zlib/src/binding.js
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--- a/node_modules/browserify-zlib/src/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