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79 lines
2.3 KiB
79 lines
2.3 KiB
7 years ago
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/* Copyright 2017 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.Jbig2Stream = undefined;
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var _primitives = require('./primitives');
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var _stream = require('./stream');
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var _jbig = require('./jbig2');
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var _util = require('../shared/util');
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var Jbig2Stream = function Jbig2StreamClosure() {
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function Jbig2Stream(stream, maybeLength, dict, params) {
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this.stream = stream;
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this.maybeLength = maybeLength;
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this.dict = dict;
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this.params = params;
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_stream.DecodeStream.call(this, maybeLength);
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}
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Jbig2Stream.prototype = Object.create(_stream.DecodeStream.prototype);
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Object.defineProperty(Jbig2Stream.prototype, 'bytes', {
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get: function get() {
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return (0, _util.shadow)(this, 'bytes', this.stream.getBytes(this.maybeLength));
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},
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configurable: true
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});
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Jbig2Stream.prototype.ensureBuffer = function (req) {
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if (this.bufferLength) {
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return;
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}
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var jbig2Image = new _jbig.Jbig2Image();
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var chunks = [];
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if ((0, _primitives.isDict)(this.params)) {
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var globalsStream = this.params.get('JBIG2Globals');
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if ((0, _primitives.isStream)(globalsStream)) {
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var globals = globalsStream.getBytes();
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chunks.push({
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data: globals,
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start: 0,
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end: globals.length
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});
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}
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}
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chunks.push({
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data: this.bytes,
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start: 0,
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end: this.bytes.length
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});
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var data = jbig2Image.parseChunks(chunks);
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var dataLength = data.length;
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for (var i = 0; i < dataLength; i++) {
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data[i] ^= 0xFF;
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}
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this.buffer = data;
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this.bufferLength = dataLength;
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this.eof = true;
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};
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return Jbig2Stream;
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}();
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exports.Jbig2Stream = Jbig2Stream;
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