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appsheet-third-party/pdfjs-dist/cf4c304c98cf65c9c110d21f6e94826bdbeb9bd3/./lib/core/ccitt.js
blob: b0477d37c2b94126fa7bdf0e9980139b80d38569 [file]
/**
* @licstart The following is the entire license notice for the
* Javascript code in this page
*
* Copyright 2020 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* @licend The above is the entire license notice for the
* Javascript code in this page
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.CCITTFaxDecoder = void 0;
var _util = require("../shared/util.js");
const CCITTFaxDecoder = function CCITTFaxDecoder() {
const ccittEOL = -2;
const ccittEOF = -1;
const twoDimPass = 0;
const twoDimHoriz = 1;
const twoDimVert0 = 2;
const twoDimVertR1 = 3;
const twoDimVertL1 = 4;
const twoDimVertR2 = 5;
const twoDimVertL2 = 6;
const twoDimVertR3 = 7;
const twoDimVertL3 = 8;
const twoDimTable = [[-1, -1], [-1, -1], [7, twoDimVertL3], [7, twoDimVertR3], [6, twoDimVertL2], [6, twoDimVertL2], [6, twoDimVertR2], [6, twoDimVertR2], [4, twoDimPass], [4, twoDimPass], [4, twoDimPass], [4, twoDimPass], [4, twoDimPass], [4, twoDimPass], [4, twoDimPass], [4, twoDimPass], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0]];
const whiteTable1 = [[-1, -1], [12, ccittEOL], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [11, 1792], [11, 1792], [12, 1984], [12, 2048], [12, 2112], [12, 2176], [12, 2240], [12, 2304], [11, 1856], [11, 1856], [11, 1920], [11, 1920], [12, 2368], [12, 2432], [12, 2496], [12, 2560]];
const whiteTable2 = [[-1, -1], [-1, -1], [-1, -1], [-1, -1], [8, 29], [8, 29], [8, 30], [8, 30], [8, 45], [8, 45], [8, 46], [8, 46], [7, 22], [7, 22], [7, 22], [7, 22], [7, 23], [7, 23], [7, 23], [7, 23], [8, 47], [8, 47], [8, 48], [8, 48], [6, 13], [6, 13], [6, 13], [6, 13], [6, 13], [6, 13], [6, 13], [6, 13], [7, 20], [7, 20], [7, 20], [7, 20], [8, 33], [8, 33], [8, 34], [8, 34], [8, 35], [8, 35], [8, 36], [8, 36], [8, 37], [8, 37], [8, 38], [8, 38], [7, 19], [7, 19], [7, 19], [7, 19], [8, 31], [8, 31], [8, 32], [8, 32], [6, 1], [6, 1], [6, 1], [6, 1], [6, 1], [6, 1], [6, 1], [6, 1], [6, 12], [6, 12], [6, 12], [6, 12], [6, 12], [6, 12], [6, 12], [6, 12], [8, 53], [8, 53], [8, 54], [8, 54], [7, 26], [7, 26], [7, 26], [7, 26], [8, 39], [8, 39], [8, 40], [8, 40], [8, 41], [8, 41], [8, 42], [8, 42], [8, 43], [8, 43], [8, 44], [8, 44], [7, 21], [7, 21], [7, 21], [7, 21], [7, 28], [7, 28], [7, 28], [7, 28], [8, 61], [8, 61], [8, 62], [8, 62], [8, 63], [8, 63], [8, 0], [8, 0], [8, 320], [8, 320], [8, 384], [8, 384], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [7, 27], [7, 27], [7, 27], [7, 27], [8, 59], [8, 59], [8, 60], [8, 60], [9, 1472], [9, 1536], [9, 1600], [9, 1728], [7, 18], [7, 18], [7, 18], [7, 18], [7, 24], [7, 24], [7, 24], [7, 24], [8, 49], [8, 49], [8, 50], [8, 50], [8, 51], [8, 51], [8, 52], [8, 52], [7, 25], [7, 25], [7, 25], [7, 25], [8, 55], [8, 55], [8, 56], [8, 56], [8, 57], [8, 57], [8, 58], [8, 58], [6, 192], [6, 192], [6, 192], [6, 192], [6, 192], [6, 192], [6, 192], [6, 192], [6, 1664], [6, 1664], [6, 1664], [6, 1664], [6, 1664], [6, 1664], [6, 1664], [6, 1664], [8, 448], [8, 448], [8, 512], [8, 512], [9, 704], [9, 768], [8, 640], [8, 640], [8, 576], [8, 576], [9, 832], [9, 896], [9, 960], [9, 1024], [9, 1088], [9, 1152], [9, 1216], [9, 1280], [9, 1344], [9, 1408], [7, 256], [7, 256], [7, 256], [7, 256], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [6, 16], [6, 16], [6, 16], [6, 16], [6, 16], [6, 16], [6, 16], [6, 16], [6, 17], [6, 17], [6, 17], [6, 17], [6, 17], [6, 17], [6, 17], [6, 17], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [6, 14], [6, 14], [6, 14], [6, 14], [6, 14], [6, 14], [6, 14], [6, 14], [6, 15], [6, 15], [6, 15], [6, 15], [6, 15], [6, 15], [6, 15], [6, 15], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7]];
const blackTable1 = [[-1, -1], [-1, -1], [12, ccittEOL], [12, ccittEOL], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [11, 1792], [11, 1792], [11, 1792], [11, 1792], [12, 1984], [12, 1984], [12, 2048], [12, 2048], [12, 2112], [12, 2112], [12, 2176], [12, 2176], [12, 2240], [12, 2240], [12, 2304], [12, 2304], [11, 1856], [11, 1856], [11, 1856], [11, 1856], [11, 1920], [11, 1920], [11, 1920], [11, 1920], [12, 2368], [12, 2368], [12, 2432], [12, 2432], [12, 2496], [12, 2496], [12, 2560], [12, 2560], [10, 18], [10, 18], [10, 18], [10, 18], [10, 18], [10, 18], [10, 18], [10, 18], [12, 52], [12, 52], [13, 640], [13, 704], [13, 768], [13, 832], [12, 55], [12, 55], [12, 56], [12, 56], [13, 1280], [13, 1344], [13, 1408], [13, 1472], [12, 59], [12, 59], [12, 60], [12, 60], [13, 1536], [13, 1600], [11, 24], [11, 24], [11, 24], [11, 24], [11, 25], [11, 25], [11, 25], [11, 25], [13, 1664], [13, 1728], [12, 320], [12, 320], [12, 384], [12, 384], [12, 448], [12, 448], [13, 512], [13, 576], [12, 53], [12, 53], [12, 54], [12, 54], [13, 896], [13, 960], [13, 1024], [13, 1088], [13, 1152], [13, 1216], [10, 64], [10, 64], [10, 64], [10, 64], [10, 64], [10, 64], [10, 64], [10, 64]];
const blackTable2 = [[8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [11, 23], [11, 23], [12, 50], [12, 51], [12, 44], [12, 45], [12, 46], [12, 47], [12, 57], [12, 58], [12, 61], [12, 256], [10, 16], [10, 16], [10, 16], [10, 16], [10, 17], [10, 17], [10, 17], [10, 17], [12, 48], [12, 49], [12, 62], [12, 63], [12, 30], [12, 31], [12, 32], [12, 33], [12, 40], [12, 41], [11, 22], [11, 22], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [9, 15], [9, 15], [9, 15], [9, 15], [9, 15], [9, 15], [9, 15], [9, 15], [12, 128], [12, 192], [12, 26], [12, 27], [12, 28], [12, 29], [11, 19], [11, 19], [11, 20], [11, 20], [12, 34], [12, 35], [12, 36], [12, 37], [12, 38], [12, 39], [11, 21], [11, 21], [12, 42], [12, 43], [10, 0], [10, 0], [10, 0], [10, 0], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12]];
const blackTable3 = [[-1, -1], [-1, -1], [-1, -1], [-1, -1], [6, 9], [6, 8], [5, 7], [5, 7], [4, 6], [4, 6], [4, 6], [4, 6], [4, 5], [4, 5], [4, 5], [4, 5], [3, 1], [3, 1], [3, 1], [3, 1], [3, 1], [3, 1], [3, 1], [3, 1], [3, 4], [3, 4], [3, 4], [3, 4], [3, 4], [3, 4], [3, 4], [3, 4], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2]];
function CCITTFaxDecoder(source, options = {}) {
if (!source || typeof source.next !== "function") {
throw new Error('CCITTFaxDecoder - invalid "source" parameter.');
}
this.source = source;
this.eof = false;
this.encoding = options.K || 0;
this.eoline = options.EndOfLine || false;
this.byteAlign = options.EncodedByteAlign || false;
this.columns = options.Columns || 1728;
this.rows = options.Rows || 0;
let eoblock = options.EndOfBlock;
if (eoblock === null || eoblock === undefined) {
eoblock = true;
}
this.eoblock = eoblock;
this.black = options.BlackIs1 || false;
this.codingLine = new Uint32Array(this.columns + 1);
this.refLine = new Uint32Array(this.columns + 2);
this.codingLine[0] = this.columns;
this.codingPos = 0;
this.row = 0;
this.nextLine2D = this.encoding < 0;
this.inputBits = 0;
this.inputBuf = 0;
this.outputBits = 0;
this.rowsDone = false;
let code1;
while ((code1 = this._lookBits(12)) === 0) {
this._eatBits(1);
}
if (code1 === 1) {
this._eatBits(12);
}
if (this.encoding > 0) {
this.nextLine2D = !this._lookBits(1);
this._eatBits(1);
}
}
CCITTFaxDecoder.prototype = {
readNextChar() {
if (this.eof) {
return -1;
}
const refLine = this.refLine;
const codingLine = this.codingLine;
const columns = this.columns;
let refPos, blackPixels, bits, i;
if (this.outputBits === 0) {
if (this.rowsDone) {
this.eof = true;
}
if (this.eof) {
return -1;
}
this.err = false;
let code1, code2, code3;
if (this.nextLine2D) {
for (i = 0; codingLine[i] < columns; ++i) {
refLine[i] = codingLine[i];
}
refLine[i++] = columns;
refLine[i] = columns;
codingLine[0] = 0;
this.codingPos = 0;
refPos = 0;
blackPixels = 0;
while (codingLine[this.codingPos] < columns) {
code1 = this._getTwoDimCode();
switch (code1) {
case twoDimPass:
this._addPixels(refLine[refPos + 1], blackPixels);
if (refLine[refPos + 1] < columns) {
refPos += 2;
}
break;
case twoDimHoriz:
code1 = code2 = 0;
if (blackPixels) {
do {
code1 += code3 = this._getBlackCode();
} while (code3 >= 64);
do {
code2 += code3 = this._getWhiteCode();
} while (code3 >= 64);
} else {
do {
code1 += code3 = this._getWhiteCode();
} while (code3 >= 64);
do {
code2 += code3 = this._getBlackCode();
} while (code3 >= 64);
}
this._addPixels(codingLine[this.codingPos] + code1, blackPixels);
if (codingLine[this.codingPos] < columns) {
this._addPixels(codingLine[this.codingPos] + code2, blackPixels ^ 1);
}
while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
refPos += 2;
}
break;
case twoDimVertR3:
this._addPixels(refLine[refPos] + 3, blackPixels);
blackPixels ^= 1;
if (codingLine[this.codingPos] < columns) {
++refPos;
while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
refPos += 2;
}
}
break;
case twoDimVertR2:
this._addPixels(refLine[refPos] + 2, blackPixels);
blackPixels ^= 1;
if (codingLine[this.codingPos] < columns) {
++refPos;
while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
refPos += 2;
}
}
break;
case twoDimVertR1:
this._addPixels(refLine[refPos] + 1, blackPixels);
blackPixels ^= 1;
if (codingLine[this.codingPos] < columns) {
++refPos;
while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
refPos += 2;
}
}
break;
case twoDimVert0:
this._addPixels(refLine[refPos], blackPixels);
blackPixels ^= 1;
if (codingLine[this.codingPos] < columns) {
++refPos;
while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
refPos += 2;
}
}
break;
case twoDimVertL3:
this._addPixelsNeg(refLine[refPos] - 3, blackPixels);
blackPixels ^= 1;
if (codingLine[this.codingPos] < columns) {
if (refPos > 0) {
--refPos;
} else {
++refPos;
}
while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
refPos += 2;
}
}
break;
case twoDimVertL2:
this._addPixelsNeg(refLine[refPos] - 2, blackPixels);
blackPixels ^= 1;
if (codingLine[this.codingPos] < columns) {
if (refPos > 0) {
--refPos;
} else {
++refPos;
}
while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
refPos += 2;
}
}
break;
case twoDimVertL1:
this._addPixelsNeg(refLine[refPos] - 1, blackPixels);
blackPixels ^= 1;
if (codingLine[this.codingPos] < columns) {
if (refPos > 0) {
--refPos;
} else {
++refPos;
}
while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
refPos += 2;
}
}
break;
case ccittEOF:
this._addPixels(columns, 0);
this.eof = true;
break;
default:
(0, _util.info)("bad 2d code");
this._addPixels(columns, 0);
this.err = true;
}
}
} else {
codingLine[0] = 0;
this.codingPos = 0;
blackPixels = 0;
while (codingLine[this.codingPos] < columns) {
code1 = 0;
if (blackPixels) {
do {
code1 += code3 = this._getBlackCode();
} while (code3 >= 64);
} else {
do {
code1 += code3 = this._getWhiteCode();
} while (code3 >= 64);
}
this._addPixels(codingLine[this.codingPos] + code1, blackPixels);
blackPixels ^= 1;
}
}
let gotEOL = false;
if (this.byteAlign) {
this.inputBits &= ~7;
}
if (!this.eoblock && this.row === this.rows - 1) {
this.rowsDone = true;
} else {
code1 = this._lookBits(12);
if (this.eoline) {
while (code1 !== ccittEOF && code1 !== 1) {
this._eatBits(1);
code1 = this._lookBits(12);
}
} else {
while (code1 === 0) {
this._eatBits(1);
code1 = this._lookBits(12);
}
}
if (code1 === 1) {
this._eatBits(12);
gotEOL = true;
} else if (code1 === ccittEOF) {
this.eof = true;
}
}
if (!this.eof && this.encoding > 0 && !this.rowsDone) {
this.nextLine2D = !this._lookBits(1);
this._eatBits(1);
}
if (this.eoblock && gotEOL && this.byteAlign) {
code1 = this._lookBits(12);
if (code1 === 1) {
this._eatBits(12);
if (this.encoding > 0) {
this._lookBits(1);
this._eatBits(1);
}
if (this.encoding >= 0) {
for (i = 0; i < 4; ++i) {
code1 = this._lookBits(12);
if (code1 !== 1) {
(0, _util.info)("bad rtc code: " + code1);
}
this._eatBits(12);
if (this.encoding > 0) {
this._lookBits(1);
this._eatBits(1);
}
}
}
this.eof = true;
}
} else if (this.err && this.eoline) {
while (true) {
code1 = this._lookBits(13);
if (code1 === ccittEOF) {
this.eof = true;
return -1;
}
if (code1 >> 1 === 1) {
break;
}
this._eatBits(1);
}
this._eatBits(12);
if (this.encoding > 0) {
this._eatBits(1);
this.nextLine2D = !(code1 & 1);
}
}
if (codingLine[0] > 0) {
this.outputBits = codingLine[this.codingPos = 0];
} else {
this.outputBits = codingLine[this.codingPos = 1];
}
this.row++;
}
let c;
if (this.outputBits >= 8) {
c = this.codingPos & 1 ? 0 : 0xff;
this.outputBits -= 8;
if (this.outputBits === 0 && codingLine[this.codingPos] < columns) {
this.codingPos++;
this.outputBits = codingLine[this.codingPos] - codingLine[this.codingPos - 1];
}
} else {
bits = 8;
c = 0;
do {
if (this.outputBits > bits) {
c <<= bits;
if (!(this.codingPos & 1)) {
c |= 0xff >> 8 - bits;
}
this.outputBits -= bits;
bits = 0;
} else {
c <<= this.outputBits;
if (!(this.codingPos & 1)) {
c |= 0xff >> 8 - this.outputBits;
}
bits -= this.outputBits;
this.outputBits = 0;
if (codingLine[this.codingPos] < columns) {
this.codingPos++;
this.outputBits = codingLine[this.codingPos] - codingLine[this.codingPos - 1];
} else if (bits > 0) {
c <<= bits;
bits = 0;
}
}
} while (bits);
}
if (this.black) {
c ^= 0xff;
}
return c;
},
_addPixels(a1, blackPixels) {
const codingLine = this.codingLine;
let codingPos = this.codingPos;
if (a1 > codingLine[codingPos]) {
if (a1 > this.columns) {
(0, _util.info)("row is wrong length");
this.err = true;
a1 = this.columns;
}
if (codingPos & 1 ^ blackPixels) {
++codingPos;
}
codingLine[codingPos] = a1;
}
this.codingPos = codingPos;
},
_addPixelsNeg(a1, blackPixels) {
const codingLine = this.codingLine;
let codingPos = this.codingPos;
if (a1 > codingLine[codingPos]) {
if (a1 > this.columns) {
(0, _util.info)("row is wrong length");
this.err = true;
a1 = this.columns;
}
if (codingPos & 1 ^ blackPixels) {
++codingPos;
}
codingLine[codingPos] = a1;
} else if (a1 < codingLine[codingPos]) {
if (a1 < 0) {
(0, _util.info)("invalid code");
this.err = true;
a1 = 0;
}
while (codingPos > 0 && a1 < codingLine[codingPos - 1]) {
--codingPos;
}
codingLine[codingPos] = a1;
}
this.codingPos = codingPos;
},
_findTableCode(start, end, table, limit) {
const limitValue = limit || 0;
for (let i = start; i <= end; ++i) {
let code = this._lookBits(i);
if (code === ccittEOF) {
return [true, 1, false];
}
if (i < end) {
code <<= end - i;
}
if (!limitValue || code >= limitValue) {
const p = table[code - limitValue];
if (p[0] === i) {
this._eatBits(i);
return [true, p[1], true];
}
}
}
return [false, 0, false];
},
_getTwoDimCode() {
let code = 0;
let p;
if (this.eoblock) {
code = this._lookBits(7);
p = twoDimTable[code];
if (p && p[0] > 0) {
this._eatBits(p[0]);
return p[1];
}
} else {
const result = this._findTableCode(1, 7, twoDimTable);
if (result[0] && result[2]) {
return result[1];
}
}
(0, _util.info)("Bad two dim code");
return ccittEOF;
},
_getWhiteCode() {
let code = 0;
let p;
if (this.eoblock) {
code = this._lookBits(12);
if (code === ccittEOF) {
return 1;
}
if (code >> 5 === 0) {
p = whiteTable1[code];
} else {
p = whiteTable2[code >> 3];
}
if (p[0] > 0) {
this._eatBits(p[0]);
return p[1];
}
} else {
let result = this._findTableCode(1, 9, whiteTable2);
if (result[0]) {
return result[1];
}
result = this._findTableCode(11, 12, whiteTable1);
if (result[0]) {
return result[1];
}
}
(0, _util.info)("bad white code");
this._eatBits(1);
return 1;
},
_getBlackCode() {
let code, p;
if (this.eoblock) {
code = this._lookBits(13);
if (code === ccittEOF) {
return 1;
}
if (code >> 7 === 0) {
p = blackTable1[code];
} else if (code >> 9 === 0 && code >> 7 !== 0) {
p = blackTable2[(code >> 1) - 64];
} else {
p = blackTable3[code >> 7];
}
if (p[0] > 0) {
this._eatBits(p[0]);
return p[1];
}
} else {
let result = this._findTableCode(2, 6, blackTable3);
if (result[0]) {
return result[1];
}
result = this._findTableCode(7, 12, blackTable2, 64);
if (result[0]) {
return result[1];
}
result = this._findTableCode(10, 13, blackTable1);
if (result[0]) {
return result[1];
}
}
(0, _util.info)("bad black code");
this._eatBits(1);
return 1;
},
_lookBits(n) {
let c;
while (this.inputBits < n) {
if ((c = this.source.next()) === -1) {
if (this.inputBits === 0) {
return ccittEOF;
}
return this.inputBuf << n - this.inputBits & 0xffff >> 16 - n;
}
this.inputBuf = this.inputBuf << 8 | c;
this.inputBits += 8;
}
return this.inputBuf >> this.inputBits - n & 0xffff >> 16 - n;
},
_eatBits(n) {
if ((this.inputBits -= n) < 0) {
this.inputBits = 0;
}
}
};
return CCITTFaxDecoder;
}();
exports.CCITTFaxDecoder = CCITTFaxDecoder;