/**
* @licstart The following is the entire license notice for the
* Javascript code in this page
*
* Copyright 2017 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.Jbig2Image = undefined;
var _util = require('../shared/util');
var _arithmetic_decoder = require('./arithmetic_decoder');
var _ccitt = require('./ccitt');
var Jbig2Error = function Jbig2ErrorClosure() {
function Jbig2Error(msg) {
this.message = 'JBIG2 error: ' + msg;
}
Jbig2Error.prototype = new Error();
Jbig2Error.prototype.name = 'Jbig2Error';
Jbig2Error.constructor = Jbig2Error;
return Jbig2Error;
}();
var Jbig2Image = function Jbig2ImageClosure() {
function ContextCache() {}
ContextCache.prototype = {
getContexts: function getContexts(id) {
if (id in this) {
return this[id];
}
return this[id] = new Int8Array(1 << 16);
}
};
function DecodingContext(data, start, end) {
this.data = data;
this.start = start;
this.end = end;
}
DecodingContext.prototype = {
get decoder() {
var decoder = new _arithmetic_decoder.ArithmeticDecoder(this.data, this.start, this.end);
return (0, _util.shadow)(this, 'decoder', decoder);
},
get contextCache() {
var cache = new ContextCache();
return (0, _util.shadow)(this, 'contextCache', cache);
}
};
function decodeInteger(contextCache, procedure, decoder) {
var contexts = contextCache.getContexts(procedure);
var prev = 1;
function readBits(length) {
var v = 0;
for (var i = 0; i < length; i++) {
var bit = decoder.readBit(contexts, prev);
prev = prev < 256 ? prev << 1 | bit : (prev << 1 | bit) & 511 | 256;
v = v << 1 | bit;
}
return v >>> 0;
}
var sign = readBits(1);
var value = readBits(1) ? readBits(1) ? readBits(1) ? readBits(1) ? readBits(1) ? readBits(32) + 4436 : readBits(12) + 340 : readBits(8) + 84 : readBits(6) + 20 : readBits(4) + 4 : readBits(2);
return sign === 0 ? value : value > 0 ? -value : null;
}
function decodeIAID(contextCache, decoder, codeLength) {
var contexts = contextCache.getContexts('IAID');
var prev = 1;
for (var i = 0; i < codeLength; i++) {
var bit = decoder.readBit(contexts, prev);
prev = prev << 1 | bit;
}
if (codeLength < 31) {
return prev & (1 << codeLength) - 1;
}
return prev & 0x7FFFFFFF;
}
var SegmentTypes = ['SymbolDictionary', null, null, null, 'IntermediateTextRegion', null, 'ImmediateTextRegion', 'ImmediateLosslessTextRegion', null, null, null, null, null, null, null, null, 'PatternDictionary', null, null, null, 'IntermediateHalftoneRegion', null, 'ImmediateHalftoneRegion', 'ImmediateLosslessHalftoneRegion', null, null, null, null, null, null, null, null, null, null, null, null, 'IntermediateGenericRegion', null, 'ImmediateGenericRegion', 'ImmediateLosslessGenericRegion', 'IntermediateGenericRefinementRegion', null, 'ImmediateGenericRefinementRegion', 'ImmediateLosslessGenericRefinementRegion', null, null, null, null, 'PageInformation', 'EndOfPage', 'EndOfStripe', 'EndOfFile', 'Profiles', 'Tables', null, null, null, null, null, null, null, null, 'Extension'];
var CodingTemplates = [[{
x: -1,
y: -2
}, {
x: 0,
y: -2
}, {
x: 1,
y: -2
}, {
x: -2,
y: -1
}, {
x: -1,
y: -1
}, {
x: 0,
y: -1
}, {
x: 1,
y: -1
}, {
x: 2,
y: -1
}, {
x: -4,
y: 0
}, {
x: -3,
y: 0
}, {
x: -2,
y: 0
}, {
x: -1,
y: 0
}], [{
x: -1,
y: -2
}, {
x: 0,
y: -2
}, {
x: 1,
y: -2
}, {
x: 2,
y: -2
}, {
x: -2,
y: -1
}, {
x: -1,
y: -1
}, {
x: 0,
y: -1
}, {
x: 1,
y: -1
}, {
x: 2,
y: -1
}, {
x: -3,
y: 0
}, {
x: -2,
y: 0
}, {
x: -1,
y: 0
}], [{
x: -1,
y: -2
}, {
x: 0,
y: -2
}, {
x: 1,
y: -2
}, {
x: -2,
y: -1
}, {
x: -1,
y: -1
}, {
x: 0,
y: -1
}, {
x: 1,
y: -1
}, {
x: -2,
y: 0
}, {
x: -1,
y: 0
}], [{
x: -3,
y: -1
}, {
x: -2,
y: -1
}, {
x: -1,
y: -1
}, {
x: 0,
y: -1
}, {
x: 1,
y: -1
}, {
x: -4,
y: 0
}, {
x: -3,
y: 0
}, {
x: -2,
y: 0
}, {
x: -1,
y: 0
}]];
var RefinementTemplates = [{
coding: [{
x: 0,
y: -1
}, {
x: 1,
y: -1
}, {
x: -1,
y: 0
}],
reference: [{
x: 0,
y: -1
}, {
x: 1,
y: -1
}, {
x: -1,
y: 0
}, {
x: 0,
y: 0
}, {
x: 1,
y: 0
}, {
x: -1,
y: 1
}, {
x: 0,
y: 1
}, {
x: 1,
y: 1
}]
}, {
coding: [{
x: -1,
y: -1
}, {
x: 0,
y: -1
}, {
x: 1,
y: -1
}, {
x: -1,
y: 0
}],
reference: [{
x: 0,
y: -1
}, {
x: -1,
y: 0
}, {
x: 0,
y: 0
}, {
x: 1,
y: 0
}, {
x: 0,
y: 1
}, {
x: 1,
y: 1
}]
}];
var ReusedContexts = [0x9B25, 0x0795, 0x00E5, 0x0195];
var RefinementReusedContexts = [0x0020, 0x0008];
function decodeBitmapTemplate0(width, height, decodingContext) {
var decoder = decodingContext.decoder;
var contexts = decodingContext.contextCache.getContexts('GB');
var contextLabel,
i,
j,
pixel,
row,
row1,
row2,
bitmap = [];
var OLD_PIXEL_MASK = 0x7BF7;
for (i = 0; i < height; i++) {
row = bitmap[i] = new Uint8Array(width);
row1 = i < 1 ? row : bitmap[i - 1];
row2 = i < 2 ? row : bitmap[i - 2];
contextLabel = row2[0] << 13 | row2[1] << 12 | row2[2] << 11 | row1[0] << 7 | row1[1] << 6 | row1[2] << 5 | row1[3] << 4;
for (j = 0; j < width; j++) {
row[j] = pixel = decoder.readBit(contexts, contextLabel);
contextLabel = (contextLabel & OLD_PIXEL_MASK) << 1 | (j + 3 < width ? row2[j + 3] << 11 : 0) | (j + 4 < width ? row1[j + 4] << 4 : 0) | pixel;
}
}
return bitmap;
}
function decodeBitmap(mmr, width, height, templateIndex, prediction, skip, at, decodingContext) {
if (mmr) {
var input = new Reader(decodingContext.data, decodingContext.start, decodingContext.end);
return decodeMMRBitmap(input, width, height, false);
}
if (templateIndex === 0 && !skip && !prediction && at.length === 4 && at[0].x === 3 && at[0].y === -1 && at[1].x === -3 && at[1].y === -1 && at[2].x === 2 && at[2].y === -2 && at[3].x === -2 && at[3].y === -2) {
return decodeBitmapTemplate0(width, height, decodingContext);
}
var useskip = !!skip;
var template = CodingTemplates[templateIndex].concat(at);
template.sort(function (a, b) {
return a.y - b.y || a.x - b.x;
});
var templateLength = template.length;
var templateX = new Int8Array(templateLength);
var templateY = new Int8Array(templateLength);
var changingTemplateEntries = [];
var reuseMask = 0,
minX = 0,
maxX = 0,
minY = 0;
var c, k;
for (k = 0; k < templateLength; k++) {
templateX[k] = template[k].x;
templateY[k] = template[k].y;
minX = Math.min(minX, template[k].x);
maxX = Math.max(maxX, template[k].x);
minY = Math.min(minY, template[k].y);
if (k < templateLength - 1 && template[k].y === template[k + 1].y && template[k].x === template[k + 1].x - 1) {
reuseMask |= 1 << templateLength - 1 - k;
} else {
changingTemplateEntries.push(k);
}
}
var changingEntriesLength = changingTemplateEntries.length;
var changingTemplateX = new Int8Array(changingEntriesLength);
var changingTemplateY = new Int8Array(changingEntriesLength);
var changingTemplateBit = new Uint16Array(changingEntriesLength);
for (c = 0; c < changingEntriesLength; c++) {
k = changingTemplateEntries[c];
changingTemplateX[c] = template[k].x;
changingTemplateY[c] = template[k].y;
changingTemplateBit[c] = 1 << templateLength - 1 - k;
}
var sbb_left = -minX;
var sbb_top = -minY;
var sbb_right = width - maxX;
var pseudoPixelContext = ReusedContexts[templateIndex];
var row = new Uint8Array(width);
var bitmap = [];
var decoder = decodingContext.decoder;
var contexts = decodingContext.contextCache.getContexts('GB');
var ltp = 0,
j,
i0,
j0,
contextLabel = 0,
bit,
shift;
for (var i = 0; i < height; i++) {
if (prediction) {
var sltp = decoder.readBit(contexts, pseudoPixelContext);
ltp ^= sltp;
if (ltp) {
bitmap.push(row);
continue;
}
}
row = new Uint8Array(row);
bitmap.push(row);
for (j = 0; j < width; j++) {
if (useskip && skip[i][j]) {
row[j] = 0;
continue;
}
if (j >= sbb_left && j < sbb_right && i >= sbb_top) {
contextLabel = contextLabel << 1 & reuseMask;
for (k = 0; k < changingEntriesLength; k++) {
i0 = i + changingTemplateY[k];
j0 = j + changingTemplateX[k];
bit = bitmap[i0][j0];
if (bit) {
bit = changingTemplateBit[k];
contextLabel |= bit;
}
}
} else {
contextLabel = 0;
shift = templateLength - 1;
for (k = 0; k < templateLength; k++, shift--) {
j0 = j + templateX[k];
if (j0 >= 0 && j0 < width) {
i0 = i + templateY[k];
if (i0 >= 0) {
bit = bitmap[i0][j0];
if (bit) {
contextLabel |= bit << shift;
}
}
}
}
}
var pixel = decoder.readBit(contexts, contextLabel);
row[j] = pixel;
}
}
return bitmap;
}
function decodeRefinement(width, height, templateIndex, referenceBitmap, offsetX, offsetY, prediction, at, decodingContext) {
var codingTemplate = RefinementTemplates[templateIndex].coding;
if (templateIndex === 0) {
codingTemplate = codingTemplate.concat([at[0]]);
}
var codingTemplateLength = codingTemplate.length;
var codingTemplateX = new Int32Array(codingTemplateLength);
var codingTemplateY = new Int32Array(codingTemplateLength);
var k;
for (k = 0; k < codingTemplateLength; k++) {
codingTemplateX[k] = codingTemplate[k].x;
codingTemplateY[k] = codingTemplate[k].y;
}
var referenceTemplate = RefinementTemplates[templateIndex].reference;
if (templateIndex === 0) {
referenceTemplate = referenceTemplate.concat([at[1]]);
}
var referenceTemplateLength = referenceTemplate.length;
var referenceTemplateX = new Int32Array(referenceTemplateLength);
var referenceTemplateY = new Int32Array(referenceTemplateLength);
for (k = 0; k < referenceTemplateLength; k++) {
referenceTemplateX[k] = referenceTemplate[k].x;
referenceTemplateY[k] = referenceTemplate[k].y;
}
var referenceWidth = referenceBitmap[0].length;
var referenceHeight = referenceBitmap.length;
var pseudoPixelContext = RefinementReusedContexts[templateIndex];
var bitmap = [];
var decoder = decodingContext.decoder;
var contexts = decodingContext.contextCache.getContexts('GR');
var ltp = 0;
for (var i = 0; i < height; i++) {
if (prediction) {
var sltp = decoder.readBit(contexts, pseudoPixelContext);
ltp ^= sltp;
if (ltp) {
throw new Jbig2Error('prediction is not supported');
}
}
var row = new Uint8Array(width);
bitmap.push(row);
for (var j = 0; j < width; j++) {
var i0, j0;
var contextLabel = 0;
for (k = 0; k < codingTemplateLength; k++) {
i0 = i + codingTemplateY[k];
j0 = j + codingTemplateX[k];
if (i0 < 0 || j0 < 0 || j0 >= width) {
contextLabel <<= 1;
} else {
contextLabel = contextLabel << 1 | bitmap[i0][j0];
}
}
for (k = 0; k < referenceTemplateLength; k++) {
i0 = i + referenceTemplateY[k] - offsetY;
j0 = j + referenceTemplateX[k] - offsetX;
if (i0 < 0 || i0 >= referenceHeight || j0 < 0 || j0 >= referenceWidth) {
contextLabel <<= 1;
} else {
contextLabel = contextLabel << 1 | referenceBitmap[i0][j0];
}
}
var pixel = decoder.readBit(contexts, contextLabel);
row[j] = pixel;
}
}
return bitmap;
}
function decodeSymbolDictionary(huffman, refinement, symbols, numberOfNewSymbols, numberOfExportedSymbols, huffmanTables, templateIndex, at, refinementTemplateIndex, refinementAt, decodingContext, huffmanInput) {
if (huffman && refinement) {
throw new Jbig2Error('symbol refinement with Huffman is not supported');
}
var newSymbols = [];
var currentHeight = 0;
var symbolCodeLength = (0, _util.log2)(symbols.length + numberOfNewSymbols);
var decoder = decodingContext.decoder;
var contextCache = decodingContext.contextCache;
var tableB1 = void 0,
symbolWidths = void 0;
if (huffman) {
tableB1 = getStandardTable(1);
symbolWidths = [];
symbolCodeLength = Math.max(symbolCodeLength, 1);
}
while (newSymbols.length < numberOfNewSymbols) {
var deltaHeight = huffman ? huffmanTables.tableDeltaHeight.decode(huffmanInput) : decodeInteger(contextCache, 'IADH', decoder);
currentHeight += deltaHeight;
var currentWidth = 0,
totalWidth = 0;
var firstSymbol = huffman ? symbolWidths.length : 0;
while (true) {
var deltaWidth = huffman ? huffmanTables.tableDeltaWidth.decode(huffmanInput) : decodeInteger(contextCache, 'IADW', decoder);
if (deltaWidth === null) {
break;
}
currentWidth += deltaWidth;
totalWidth += currentWidth;
var bitmap;
if (refinement) {
var numberOfInstances = decodeInteger(contextCache, 'IAAI', decoder);
if (numberOfInstances > 1) {
bitmap = decodeTextRegion(huffman, refinement, currentWidth, currentHeight, 0, numberOfInstances, 1, symbols.concat(newSymbols), symbolCodeLength, 0, 0, 1, 0, huffmanTables, refinementTemplateIndex, refinementAt, decodingContext, 0, huffmanInput);
} else {
var symbolId = decodeIAID(contextCache, decoder, symbolCodeLength);
var rdx = decodeInteger(contextCache, 'IARDX', decoder);
var rdy = decodeInteger(contextCache, 'IARDY', decoder);
var symbol = symbolId < symbols.length ? symbols[symbolId] : newSymbols[symbolId - symbols.length];
bitmap = decodeRefinement(currentWidth, currentHeight, refinementTemplateIndex, symbol, rdx, rdy, false, refinementAt, decodingContext);
}
newSymbols.push(bitmap);
} else if (huffman) {
symbolWidths.push(currentWidth);
} else {
bitmap = decodeBitmap(false, currentWidth, currentHeight, templateIndex, false, null, at, decodingContext);
newSymbols.push(bitmap);
}
}
if (huffman && !refinement) {
var bitmapSize = huffmanTables.tableBitmapSize.decode(huffmanInput);
huffmanInput.byteAlign();
var collectiveBitmap = void 0;
if (bitmapSize === 0) {
collectiveBitmap = readUncompressedBitmap(huffmanInput, totalWidth, currentHeight);
} else {
var originalEnd = huffmanInput.end;
var bitmapEnd = huffmanInput.position + bitmapSize;
huffmanInput.end = bitmapEnd;
collectiveBitmap = decodeMMRBitmap(huffmanInput, totalWidth, currentHeight, false);
huffmanInput.end = originalEnd;
huffmanInput.position = bitmapEnd;
}
var numberOfSymbolsDecoded = symbolWidths.length;
if (firstSymbol === numberOfSymbolsDecoded - 1) {
newSymbols.push(collectiveBitmap);
} else {
var _i = void 0,
y = void 0,
xMin = 0,
xMax = void 0,
bitmapWidth = void 0,
symbolBitmap = void 0;
for (_i = firstSymbol; _i < numberOfSymbolsDecoded; _i++) {
bitmapWidth = symbolWidths[_i];
xMax = xMin + bitmapWidth;
symbolBitmap = [];
for (y = 0; y < currentHeight; y++) {
symbolBitmap.push(collectiveBitmap[y].subarray(xMin, xMax));
}
newSymbols.push(symbolBitmap);
xMin = xMax;
}
}
}
}
var exportedSymbols = [];
var flags = [],
currentFlag = false;
var totalSymbolsLength = symbols.length + numberOfNewSymbols;
while (flags.length < totalSymbolsLength) {
var runLength = huffman ? tableB1.decode(huffmanInput) : decodeInteger(contextCache, 'IAEX', decoder);
while (runLength--) {
flags.push(currentFlag);
}
currentFlag = !currentFlag;
}
for (var i = 0, ii = symbols.length; i < ii; i++) {
if (flags[i]) {
exportedSymbols.push(symbols[i]);
}
}
for (var j = 0; j < numberOfNewSymbols; i++, j++) {
if (flags[i]) {
exportedSymbols.push(newSymbols[j]);
}
}
return exportedSymbols;
}
function decodeTextRegion(huffman, refinement, width, height, defaultPixelValue, numberOfSymbolInstances, stripSize, inputSymbols, symbolCodeLength, transposed, dsOffset, referenceCorner, combinationOperator, huffmanTables, refinementTemplateIndex, refinementAt, decodingContext, logStripSize, huffmanInput) {
if (huffman && refinement) {
throw new Jbig2Error('refinement with Huffman is not supported');
}
var bitmap = [];
var i, row;
for (i = 0; i < height; i++) {
row = new Uint8Array(width);
if (defaultPixelValue) {
for (var j = 0; j < width; j++) {
row[j] = defaultPixelValue;
}
}
bitmap.push(row);
}
var decoder = decodingContext.decoder;
var contextCache = decodingContext.contextCache;
var stripT = huffman ? -huffmanTables.tableDeltaT.decode(huffmanInput) : -decodeInteger(contextCache, 'IADT', decoder);
var firstS = 0;
i = 0;
while (i < numberOfSymbolInstances) {
var deltaT = huffman ? huffmanTables.tableDeltaT.decode(huffmanInput) : decodeInteger(contextCache, 'IADT', decoder);
stripT += deltaT;
var deltaFirstS = huffman ? huffmanTables.tableFirstS.decode(huffmanInput) : decodeInteger(contextCache, 'IAFS', decoder);
firstS += deltaFirstS;
var currentS = firstS;
do {
var currentT = 0;
if (stripSize > 1) {
currentT = huffman ? huffmanInput.readBits(logStripSize) : decodeInteger(contextCache, 'IAIT', decoder);
}
var t = stripSize * stripT + currentT;
var symbolId = huffman ? huffmanTables.symbolIDTable.decode(huffmanInput) : decodeIAID(contextCache, decoder, symbolCodeLength);
var applyRefinement = refinement && (huffman ? huffmanInput.readBit() : decodeInteger(contextCache, 'IARI', decoder));
var symbolBitmap = inputSymbols[symbolId];
var symbolWidth = symbolBitmap[0].length;
var symbolHeight = symbolBitmap.length;
if (applyRefinement) {
var rdw = decodeInteger(contextCache, 'IARDW', decoder);
var rdh = decodeInteger(contextCache, 'IARDH', decoder);
var rdx = decodeInteger(contextCache, 'IARDX', decoder);
var rdy = decodeInteger(contextCache, 'IARDY', decoder);
symbolWidth += rdw;
symbolHeight += rdh;
symbolBitmap = decodeRefinement(symbolWidth, symbolHeight, refinementTemplateIndex, symbolBitmap, (rdw >> 1) + rdx, (rdh >> 1) + rdy, false, refinementAt, decodingContext);
}
var offsetT = t - (referenceCorner & 1 ? 0 : symbolHeight - 1);
var offsetS = currentS - (referenceCorner & 2 ? symbolWidth - 1 : 0);
var s2, t2, symbolRow;
if (transposed) {
for (s2 = 0; s2 < symbolHeight; s2++) {
row = bitmap[offsetS + s2];
if (!row) {
continue;
}
symbolRow = symbolBitmap[s2];
var maxWidth = Math.min(width - offsetT, symbolWidth);
switch (combinationOperator) {
case 0:
for (t2 = 0; t2 < maxWidth; t2++) {
row[offsetT + t2] |= symbolRow[t2];
}
break;
case 2:
for (t2 = 0; t2 < maxWidth; t2++) {
row[offsetT + t2] ^= symbolRow[t2];
}
break;
default:
throw new Jbig2Error('operator ' + combinationOperator + ' is not supported');
}
}
currentS += symbolHeight - 1;
} else {
for (t2 = 0; t2 < symbolHeight; t2++) {
row = bitmap[offsetT + t2];
if (!row) {
continue;
}
symbolRow = symbolBitmap[t2];
switch (combinationOperator) {
case 0:
for (s2 = 0; s2 < symbolWidth; s2++) {
row[offsetS + s2] |= symbolRow[s2];
}
break;
case 2:
for (s2 = 0; s2 < symbolWidth; s2++) {
row[offsetS + s2] ^= symbolRow[s2];
}
break;
default:
throw new Jbig2Error('operator ' + combinationOperator + ' is not supported');
}
}
currentS += symbolWidth - 1;
}
i++;
var deltaS = huffman ? huffmanTables.tableDeltaS.decode(huffmanInput) : decodeInteger(contextCache, 'IADS', decoder);
if (deltaS === null) {
break;
}
currentS += deltaS + dsOffset;
} while (true);
}
return bitmap;
}
function decodePatternDictionary(mmr, patternWidth, patternHeight, maxPatternIndex, template, decodingContext) {
var at = [];
if (!mmr) {
at.push({
x: -patternWidth,
y: 0
});
if (template === 0) {
at.push({
x: -3,
y: -1
});
at.push({
x: 2,
y: -2
});
at.push({
x: -2,
y: -2
});
}
}
var collectiveWidth = (maxPatternIndex + 1) * patternWidth;
var collectiveBitmap = decodeBitmap(mmr, collectiveWidth, patternHeight, template, false, null, at, decodingContext);
var patterns = [],
i = 0,
patternBitmap = void 0,
xMin = void 0,
xMax = void 0,
y = void 0;
while (i <= maxPatternIndex) {
patternBitmap = [];
xMin = patternWidth * i;
xMax = xMin + patternWidth;
for (y = 0; y < patternHeight; y++) {
patternBitmap.push(collectiveBitmap[y].subarray(xMin, xMax));
}
patterns.push(patternBitmap);
i++;
}
return patterns;
}
function decodeHalftoneRegion(mmr, patterns, template, regionWidth, regionHeight, defaultPixelValue, enableSkip, combinationOperator, gridWidth, gridHeight, gridOffsetX, gridOffsetY, gridVectorX, gridVectorY, decodingContext) {
var skip = null;
if (enableSkip) {
throw new Jbig2Error('skip is not supported');
}
if (combinationOperator !== 0) {
throw new Jbig2Error('operator ' + combinationOperator + ' is not supported in halftone region');
}
var regionBitmap = [];
var i = void 0,
j = void 0,
row = void 0;
for (i = 0; i < regionHeight; i++) {
row = new Uint8Array(regionWidth);
if (defaultPixelValue) {
for (j = 0; j < regionWidth; j++) {
row[j] = defaultPixelValue;
}
}
regionBitmap.push(row);
}
var numberOfPatterns = patterns.length;
var pattern0 = patterns[0];
var patternWidth = pattern0[0].length,
patternHeight = pattern0.length;
var bitsPerValue = (0, _util.log2)(numberOfPatterns);
var at = [];
if (!mmr) {
at.push({
x: template <= 1 ? 3 : 2,
y: -1
});
if (template === 0) {
at.push({
x: -3,
y: -1
});
at.push({
x: 2,
y: -2
});
at.push({
x: -2,
y: -2
});
}
}
var grayScaleBitPlanes = [],
mmrInput = void 0,
bitmap = void 0;
if (mmr) {
mmrInput = new Reader(decodingContext.data, decodingContext.start, decodingContext.end);
}
for (i = bitsPerValue - 1; i >= 0; i--) {
if (mmr) {
bitmap = decodeMMRBitmap(mmrInput, gridWidth, gridHeight, true);
} else {
bitmap = decodeBitmap(false, gridWidth, gridHeight, template, false, skip, at, decodingContext);
}
grayScaleBitPlanes[i] = bitmap;
}
var mg = void 0,
ng = void 0,
bit = void 0,
patternIndex = void 0,
patternBitmap = void 0,
x = void 0,
y = void 0,
patternRow = void 0,
regionRow = void 0;
for (mg = 0; mg < gridHeight; mg++) {
for (ng = 0; ng < gridWidth; ng++) {
bit = 0;
patternIndex = 0;
for (j = bitsPerValue - 1; j >= 0; j--) {
bit = grayScaleBitPlanes[j][mg][ng] ^ bit;
patternIndex |= bit << j;
}
patternBitmap = patterns[patternIndex];
x = gridOffsetX + mg * gridVectorY + ng * gridVectorX >> 8;
y = gridOffsetY + mg * gridVectorX - ng * gridVectorY >> 8;
if (x >= 0 && x + patternWidth <= regionWidth && y >= 0 && y + patternHeight <= regionHeight) {
for (i = 0; i < patternHeight; i++) {
regionRow = regionBitmap[y + i];
patternRow = patternBitmap[i];
for (j = 0; j < patternWidth; j++) {
regionRow[x + j] |= patternRow[j];
}
}
} else {
var regionX = void 0,
regionY = void 0;
for (i = 0; i < patternHeight; i++) {
regionY = y + i;
if (regionY < 0 || regionY >= regionHeight) {
continue;
}
regionRow = regionBitmap[regionY];
patternRow = patternBitmap[i];
for (j = 0; j < patternWidth; j++) {
regionX = x + j;
if (regionX >= 0 && regionX < regionWidth) {
regionRow[regionX] |= patternRow[j];
}
}
}
}
}
}
return regionBitmap;
}
function readSegmentHeader(data, start) {
var segmentHeader = {};
segmentHeader.number = (0, _util.readUint32)(data, start);
var flags = data[start + 4];
var segmentType = flags & 0x3F;
if (!SegmentTypes[segmentType]) {
throw new Jbig2Error('invalid segment type: ' + segmentType);
}
segmentHeader.type = segmentType;
segmentHeader.typeName = SegmentTypes[segmentType];
segmentHeader.deferredNonRetain = !!(flags & 0x80);
var pageAssociationFieldSize = !!(flags & 0x40);
var referredFlags = data[start + 5];
var referredToCount = referredFlags >> 5 & 7;
var retainBits = [referredFlags & 31];
var position = start + 6;
if (referredFlags === 7) {
referredToCount = (0, _util.readUint32)(data, position - 1) & 0x1FFFFFFF;
position += 3;
var bytes = referredToCount + 7 >> 3;
retainBits[0] = data[position++];
while (--bytes > 0) {
retainBits.push(data[position++]);
}
} else if (referredFlags === 5 || referredFlags === 6) {
throw new Jbig2Error('invalid referred-to flags');
}
segmentHeader.retainBits = retainBits;
var referredToSegmentNumberSize = segmentHeader.number <= 256 ? 1 : segmentHeader.number <= 65536 ? 2 : 4;
var referredTo = [];
var i, ii;
for (i = 0; i < referredToCount; i++) {
var number = referredToSegmentNumberSize === 1 ? data[position] : referredToSegmentNumberSize === 2 ? (0, _util.readUint16)(data, position) : (0, _util.readUint32)(data, position);
referredTo.push(number);
position += referredToSegmentNumberSize;
}
segmentHeader.referredTo = referredTo;
if (!pageAssociationFieldSize) {
segmentHeader.pageAssociation = data[position++];
} else {
segmentHeader.pageAssociation = (0, _util.readUint32)(data, position);
position += 4;
}
segmentHeader.length = (0, _util.readUint32)(data, position);
position += 4;
if (segmentHeader.length === 0xFFFFFFFF) {
if (segmentType === 38) {
var genericRegionInfo = readRegionSegmentInformation(data, position);
var genericRegionSegmentFlags = data[position + RegionSegmentInformationFieldLength];
var genericRegionMmr = !!(genericRegionSegmentFlags & 1);
var searchPatternLength = 6;
var searchPattern = new Uint8Array(searchPatternLength);
if (!genericRegionMmr) {
searchPattern[0] = 0xFF;
searchPattern[1] = 0xAC;
}
searchPattern[2] = genericRegionInfo.height >>> 24 & 0xFF;
searchPattern[3] = genericRegionInfo.height >> 16 & 0xFF;
searchPattern[4] = genericRegionInfo.height >> 8 & 0xFF;
searchPattern[5] = genericRegionInfo.height & 0xFF;
for (i = position, ii = data.length; i < ii; i++) {
var j = 0;
while (j < searchPatternLength && searchPattern[j] === data[i + j]) {
j++;
}
if (j === searchPatternLength) {
segmentHeader.length = i + searchPatternLength;
break;
}
}
if (segmentHeader.length === 0xFFFFFFFF) {
throw new Jbig2Error('segment end was not found');
}
} else {
throw new Jbig2Error('invalid unknown segment length');
}
}
segmentHeader.headerEnd = position;
return segmentHeader;
}
function readSegments(header, data, start, end) {
var segments = [];
var position = start;
while (position < end) {
var segmentHeader = readSegmentHeader(data, position);
position = segmentHeader.headerEnd;
var segment = {
header: segmentHeader,
data: data
};
if (!header.randomAccess) {
segment.start = position;
position += segmentHeader.length;
segment.end = position;
}
segments.push(segment);
if (segmentHeader.type === 51) {
break;
}
}
if (header.randomAccess) {
for (var i = 0, ii = segments.length; i < ii; i++) {
segments[i].start = position;
position += segments[i].header.length;
segments[i].end = position;
}
}
return segments;
}
function readRegionSegmentInformation(data, start) {
return {
width: (0, _util.readUint32)(data, start),
height: (0, _util.readUint32)(data, start + 4),
x: (0, _util.readUint32)(data, start + 8),
y: (0, _util.readUint32)(data, start + 12),
combinationOperator: data[start + 16] & 7
};
}
var RegionSegmentInformationFieldLength = 17;
function processSegment(segment, visitor) {
var header = segment.header;
var data = segment.data,
position = segment.start,
end = segment.end;
var args, at, i, atLength;
switch (header.type) {
case 0:
var dictionary = {};
var dictionaryFlags = (0, _util.readUint16)(data, position);
dictionary.huffman = !!(dictionaryFlags & 1);
dictionary.refinement = !!(dictionaryFlags & 2);
dictionary.huffmanDHSelector = dictionaryFlags >> 2 & 3;
dictionary.huffmanDWSelector = dictionaryFlags >> 4 & 3;
dictionary.bitmapSizeSelector = dictionaryFlags >> 6 & 1;
dictionary.aggregationInstancesSelector = dictionaryFlags >> 7 & 1;
dictionary.bitmapCodingContextUsed = !!(dictionaryFlags & 256);
dictionary.bitmapCodingContextRetained = !!(dictionaryFlags & 512);
dictionary.template = dictionaryFlags >> 10 & 3;
dictionary.refinementTemplate = dictionaryFlags >> 12 & 1;
position += 2;
if (!dictionary.huffman) {
atLength = dictionary.template === 0 ? 4 : 1;
at = [];
for (i = 0; i < atLength; i++) {
at.push({
x: (0, _util.readInt8)(data, position),
y: (0, _util.readInt8)(data, position + 1)
});
position += 2;
}
dictionary.at = at;
}
if (dictionary.refinement && !dictionary.refinementTemplate) {
at = [];
for (i = 0; i < 2; i++) {
at.push({
x: (0, _util.readInt8)(data, position),
y: (0, _util.readInt8)(data, position + 1)
});
position += 2;
}
dictionary.refinementAt = at;
}
dictionary.numberOfExportedSymbols = (0, _util.readUint32)(data, position);
position += 4;
dictionary.numberOfNewSymbols = (0, _util.readUint32)(data, position);
position += 4;
args = [dictionary, header.number, header.referredTo, data, position, end];
break;
case 6:
case 7:
var textRegion = {};
textRegion.info = readRegionSegmentInformation(data, position);
position += RegionSegmentInformationFieldLength;
var textRegionSegmentFlags = (0, _util.readUint16)(data, position);
position += 2;
textRegion.huffman = !!(textRegionSegmentFlags & 1);
textRegion.refinement = !!(textRegionSegmentFlags & 2);
textRegion.logStripSize = textRegionSegmentFlags >> 2 & 3;
textRegion.stripSize = 1 << textRegion.logStripSize;
textRegion.referenceCorner = textRegionSegmentFlags >> 4 & 3;
textRegion.transposed = !!(textRegionSegmentFlags & 64);
textRegion.combinationOperator = textRegionSegmentFlags >> 7 & 3;
textRegion.defaultPixelValue = textRegionSegmentFlags >> 9 & 1;
textRegion.dsOffset = textRegionSegmentFlags << 17 >> 27;
textRegion.refinementTemplate = textRegionSegmentFlags >> 15 & 1;
if (textRegion.huffman) {
var textRegionHuffmanFlags = (0, _util.readUint16)(data, position);
position += 2;
textRegion.huffmanFS = textRegionHuffmanFlags & 3;
textRegion.huffmanDS = textRegionHuffmanFlags >> 2 & 3;
textRegion.huffmanDT = textRegionHuffmanFlags >> 4 & 3;
textRegion.huffmanRefinementDW = textRegionHuffmanFlags >> 6 & 3;
textRegion.huffmanRefinementDH = textRegionHuffmanFlags >> 8 & 3;
textRegion.huffmanRefinementDX = textRegionHuffmanFlags >> 10 & 3;
textRegion.huffmanRefinementDY = textRegionHuffmanFlags >> 12 & 3;
textRegion.huffmanRefinementSizeSelector = !!(textRegionHuffmanFlags & 0x4000);
}
if (textRegion.refinement && !textRegion.refinementTemplate) {
at = [];
for (i = 0; i < 2; i++) {
at.push({
x: (0, _util.readInt8)(data, position),
y: (0, _util.readInt8)(data, position + 1)
});
position += 2;
}
textRegion.refinementAt = at;
}
textRegion.numberOfSymbolInstances = (0, _util.readUint32)(data, position);
position += 4;
args = [textRegion, header.referredTo, data, position, end];
break;
case 16:
var patternDictionary = {};
var patternDictionaryFlags = data[position++];
patternDictionary.mmr = !!(patternDictionaryFlags & 1);
patternDictionary.template = patternDictionaryFlags >> 1 & 3;
patternDictionary.patternWidth = data[position++];
patternDictionary.patternHeight = data[position++];
patternDictionary.maxPatternIndex = (0, _util.readUint32)(data, position);
position += 4;
args = [patternDictionary, header.number, data, position, end];
break;
case 22:
case 23:
var halftoneRegion = {};
halftoneRegion.info = readRegionSegmentInformation(data, position);
position += RegionSegmentInformationFieldLength;
var halftoneRegionFlags = data[position++];
halftoneRegion.mmr = !!(halftoneRegionFlags & 1);
halftoneRegion.template = halftoneRegionFlags >> 1 & 3;
halftoneRegion.enableSkip = !!(halftoneRegionFlags & 8);
halftoneRegion.combinationOperator = halftoneRegionFlags >> 4 & 7;
halftoneRegion.defaultPixelValue = halftoneRegionFlags >> 7 & 1;
halftoneRegion.gridWidth = (0, _util.readUint32)(data, position);
position += 4;
halftoneRegion.gridHeight = (0, _util.readUint32)(data, position);
position += 4;
halftoneRegion.gridOffsetX = (0, _util.readUint32)(data, position) & 0xFFFFFFFF;
position += 4;
halftoneRegion.gridOffsetY = (0, _util.readUint32)(data, position) & 0xFFFFFFFF;
position += 4;
halftoneRegion.gridVectorX = (0, _util.readUint16)(data, position);
position += 2;
halftoneRegion.gridVectorY = (0, _util.readUint16)(data, position);
position += 2;
args = [halftoneRegion, header.referredTo, data, position, end];
break;
case 38:
case 39:
var genericRegion = {};
genericRegion.info = readRegionSegmentInformation(data, position);
position += RegionSegmentInformationFieldLength;
var genericRegionSegmentFlags = data[position++];
genericRegion.mmr = !!(genericRegionSegmentFlags & 1);
genericRegion.template = genericRegionSegmentFlags >> 1 & 3;
genericRegion.prediction = !!(genericRegionSegmentFlags & 8);
if (!genericRegion.mmr) {
atLength = genericRegion.template === 0 ? 4 : 1;
at = [];
for (i = 0; i < atLength; i++) {
at.push({
x: (0, _util.readInt8)(data, position),
y: (0, _util.readInt8)(data, position + 1)
});
position += 2;
}
genericRegion.at = at;
}
args = [genericRegion, data, position, end];
break;
case 48:
var pageInfo = {
width: (0, _util.readUint32)(data, position),
height: (0, _util.readUint32)(data, position + 4),
resolutionX: (0, _util.readUint32)(data, position + 8),
resolutionY: (0, _util.readUint32)(data, position + 12)
};
if (pageInfo.height === 0xFFFFFFFF) {
delete pageInfo.height;
}
var pageSegmentFlags = data[position + 16];
(0, _util.readUint16)(data, position + 17);
pageInfo.lossless = !!(pageSegmentFlags & 1);
pageInfo.refinement = !!(pageSegmentFlags & 2);
pageInfo.defaultPixelValue = pageSegmentFlags >> 2 & 1;
pageInfo.combinationOperator = pageSegmentFlags >> 3 & 3;
pageInfo.requiresBuffer = !!(pageSegmentFlags & 32);
pageInfo.combinationOperatorOverride = !!(pageSegmentFlags & 64);
args = [pageInfo];
break;
case 49:
break;
case 50:
break;
case 51:
break;
case 53:
args = [header.number, data, position, end];
break;
case 62:
break;
default:
throw new Jbig2Error('segment type ' + header.typeName + '(' + header.type + ')' + ' is not implemented');
}
var callbackName = 'on' + header.typeName;
if (callbackName in visitor) {
visitor[callbackName].apply(visitor, args);
}
}
function processSegments(segments, visitor) {
for (var i = 0, ii = segments.length; i < ii; i++) {
processSegment(segments[i], visitor);
}
}
function parseJbig2Chunks(chunks) {
var visitor = new SimpleSegmentVisitor();
for (var i = 0, ii = chunks.length; i < ii; i++) {
var chunk = chunks[i];
var segments = readSegments({}, chunk.data, chunk.start, chunk.end);
processSegments(segments, visitor);
}
return visitor.buffer;
}
function SimpleSegmentVisitor() {}
SimpleSegmentVisitor.prototype = {
onPageInformation: function SimpleSegmentVisitor_onPageInformation(info) {
this.currentPageInfo = info;
var rowSize = info.width + 7 >> 3;
var buffer = new Uint8ClampedArray(rowSize * info.height);
if (info.defaultPixelValue) {
for (var i = 0, ii = buffer.length; i < ii; i++) {
buffer[i] = 0xFF;
}
}
this.buffer = buffer;
},
drawBitmap: function SimpleSegmentVisitor_drawBitmap(regionInfo, bitmap) {
var pageInfo = this.currentPageInfo;
var width = regionInfo.width,
height = regionInfo.height;
var rowSize = pageInfo.width + 7 >> 3;
var combinationOperator = pageInfo.combinationOperatorOverride ? regionInfo.combinationOperator : pageInfo.combinationOperator;
var buffer = this.buffer;
var mask0 = 128 >> (regionInfo.x & 7);
var offset0 = regionInfo.y * rowSize + (regionInfo.x >> 3);
var i, j, mask, offset;
switch (combinationOperator) {
case 0:
for (i = 0; i < height; i++) {
mask = mask0;
offset = offset0;
for (j = 0; j < width; j++) {
if (bitmap[i][j]) {
buffer[offset] |= mask;
}
mask >>= 1;
if (!mask) {
mask = 128;
offset++;
}
}
offset0 += rowSize;
}
break;
case 2:
for (i = 0; i < height; i++) {
mask = mask0;
offset = offset0;
for (j = 0; j < width; j++) {
if (bitmap[i][j]) {
buffer[offset] ^= mask;
}
mask >>= 1;
if (!mask) {
mask = 128;
offset++;
}
}
offset0 += rowSize;
}
break;
default:
throw new Jbig2Error('operator ' + combinationOperator + ' is not supported');
}
},
onImmediateGenericRegion: function SimpleSegmentVisitor_onImmediateGenericRegion(region, data, start, end) {
var regionInfo = region.info;
var decodingContext = new DecodingContext(data, start, end);
var bitmap = decodeBitmap(region.mmr, regionInfo.width, regionInfo.height, region.template, region.prediction, null, region.at, decodingContext);
this.drawBitmap(regionInfo, bitmap);
},
onImmediateLosslessGenericRegion: function SimpleSegmentVisitor_onImmediateLosslessGenericRegion() {
this.onImmediateGenericRegion.apply(this, arguments);
},
onSymbolDictionary: function SimpleSegmentVisitor_onSymbolDictionary(dictionary, currentSegment, referredSegments, data, start, end) {
var huffmanTables = void 0,
huffmanInput = void 0;
if (dictionary.huffman) {
huffmanTables = getSymbolDictionaryHuffmanTables(dictionary, referredSegments, this.customTables);
huffmanInput = new Reader(data, start, end);
}
var symbols = this.symbols;
if (!symbols) {
this.symbols = symbols = {};
}
var inputSymbols = [];
for (var i = 0, ii = referredSegments.length; i < ii; i++) {
var referredSymbols = symbols[referredSegments[i]];
if (referredSymbols) {
inputSymbols = inputSymbols.concat(referredSymbols);
}
}
var decodingContext = new DecodingContext(data, start, end);
symbols[currentSegment] = decodeSymbolDictionary(dictionary.huffman, dictionary.refinement, inputSymbols, dictionary.numberOfNewSymbols, dictionary.numberOfExportedSymbols, huffmanTables, dictionary.template, dictionary.at, dictionary.refinementTemplate, dictionary.refinementAt, decodingContext, huffmanInput);
},
onImmediateTextRegion: function SimpleSegmentVisitor_onImmediateTextRegion(region, referredSegments, data, start, end) {
var regionInfo = region.info;
var huffmanTables = void 0,
huffmanInput = void 0;
var symbols = this.symbols;
var inputSymbols = [];
for (var i = 0, ii = referredSegments.length; i < ii; i++) {
var referredSymbols = symbols[referredSegments[i]];
if (referredSymbols) {
inputSymbols = inputSymbols.concat(referredSymbols);
}
}
var symbolCodeLength = (0, _util.log2)(inputSymbols.length);
if (region.huffman) {
huffmanInput = new Reader(data, start, end);
huffmanTables = getTextRegionHuffmanTables(region, referredSegments, this.customTables, inputSymbols.length, huffmanInput);
}
var decodingContext = new DecodingContext(data, start, end);
var bitmap = decodeTextRegion(region.huffman, region.refinement, regionInfo.width, regionInfo.height, region.defaultPixelValue, region.numberOfSymbolInstances, region.stripSize, inputSymbols, symbolCodeLength, region.transposed, region.dsOffset, region.referenceCorner, region.combinationOperator, huffmanTables, region.refinementTemplate, region.refinementAt, decodingContext, region.logStripSize, huffmanInput);
this.drawBitmap(regionInfo, bitmap);
},
onImmediateLosslessTextRegion: function SimpleSegmentVisitor_onImmediateLosslessTextRegion() {
this.onImmediateTextRegion.apply(this, arguments);
},
onPatternDictionary: function onPatternDictionary(dictionary, currentSegment, data, start, end) {
var patterns = this.patterns;
if (!patterns) {
this.patterns = patterns = {};
}
var decodingContext = new DecodingContext(data, start, end);
patterns[currentSegment] = decodePatternDictionary(dictionary.mmr, dictionary.patternWidth, dictionary.patternHeight, dictionary.maxPatternIndex, dictionary.template, decodingContext);
},
onImmediateHalftoneRegion: function onImmediateHalftoneRegion(region, referredSegments, data, start, end) {
var patterns = this.patterns[referredSegments[0]];
var regionInfo = region.info;
var decodingContext = new DecodingContext(data, start, end);
var bitmap = decodeHalftoneRegion(region.mmr, patterns, region.template, regionInfo.width, regionInfo.height, region.defaultPixelValue, region.enableSkip, region.combinationOperator, region.gridWidth, region.gridHeight, region.gridOffsetX, region.gridOffsetY, region.gridVectorX, region.gridVectorY, decodingContext);
this.drawBitmap(regionInfo, bitmap);
},
onImmediateLosslessHalftoneRegion: function onImmediateLosslessHalftoneRegion() {
this.onImmediateHalftoneRegion.apply(this, arguments);
},
onTables: function onTables(currentSegment, data, start, end) {
var customTables = this.customTables;
if (!customTables) {
this.customTables = customTables = {};
}
customTables[currentSegment] = decodeTablesSegment(data, start, end);
}
};
function HuffmanLine(lineData) {
if (lineData.length === 2) {
this.isOOB = true;
this.rangeLow = 0;
this.prefixLength = lineData[0];
this.rangeLength = 0;
this.prefixCode = lineData[1];
this.isLowerRange = false;
} else {
this.isOOB = false;
this.rangeLow = lineData[0];
this.prefixLength = lineData[1];
this.rangeLength = lineData[2];
this.prefixCode = lineData[3];
this.isLowerRange = lineData[4] === 'lower';
}
}
function HuffmanTreeNode(line) {
this.children = [];
if (line) {
this.isLeaf = true;
this.rangeLength = line.rangeLength;
this.rangeLow = line.rangeLow;
this.isLowerRange = line.isLowerRange;
this.isOOB = line.isOOB;
} else {
this.isLeaf = false;
}
}
HuffmanTreeNode.prototype = {
buildTree: function buildTree(line, shift) {
var bit = line.prefixCode >> shift & 1;
if (shift <= 0) {
this.children[bit] = new HuffmanTreeNode(line);
} else {
var node = this.children[bit];
if (!node) {
this.children[bit] = node = new HuffmanTreeNode(null);
}
node.buildTree(line, shift - 1);
}
},
decodeNode: function decodeNode(reader) {
if (this.isLeaf) {
if (this.isOOB) {
return null;
}
var htOffset = reader.readBits(this.rangeLength);
return this.rangeLow + (this.isLowerRange ? -htOffset : htOffset);
}
var node = this.children[reader.readBit()];
if (!node) {
throw new Jbig2Error('invalid Huffman data');
}
return node.decodeNode(reader);
}
};
function HuffmanTable(lines, prefixCodesDone) {
if (!prefixCodesDone) {
this.assignPrefixCodes(lines);
}
this.rootNode = new HuffmanTreeNode(null);
var i = void 0,
ii = lines.length,
line = void 0;
for (i = 0; i < ii; i++) {
line = lines[i];
if (line.prefixLength > 0) {
this.rootNode.buildTree(line, line.prefixLength - 1);
}
}
}
HuffmanTable.prototype = {
decode: function decode(reader) {
return this.rootNode.decodeNode(reader);
},
assignPrefixCodes: function assignPrefixCodes(lines) {
var linesLength = lines.length,
prefixLengthMax = 0,
i = void 0;
for (i = 0; i < linesLength; i++) {
prefixLengthMax = Math.max(prefixLengthMax, lines[i].prefixLength);
}
var histogram = new Uint32Array(prefixLengthMax + 1);
for (i = 0; i < linesLength; i++) {
histogram[lines[i].prefixLength]++;
}
var currentLength = 1,
firstCode = 0,
currentCode = void 0,
currentTemp = void 0,
line = void 0;
histogram[0] = 0;
while (currentLength <= prefixLengthMax) {
firstCode = firstCode + histogram[currentLength - 1] << 1;
currentCode = firstCode;
currentTemp = 0;
while (currentTemp < linesLength) {
line = lines[currentTemp];
if (line.prefixLength === currentLength) {
line.prefixCode = currentCode;
currentCode++;
}
currentTemp++;
}
currentLength++;
}
}
};
function decodeTablesSegment(data, start, end) {
var flags = data[start];
var lowestValue = (0, _util.readUint32)(data, start + 1) & 0xFFFFFFFF;
var highestValue = (0, _util.readUint32)(data, start + 5) & 0xFFFFFFFF;
var reader = new Reader(data, start + 9, end);
var prefixSizeBits = (flags >> 1 & 7) + 1;
var rangeSizeBits = (flags >> 4 & 7) + 1;
var lines = [];
var prefixLength = void 0,
rangeLength = void 0,
currentRangeLow = lowestValue;
do {
prefixLength = reader.readBits(prefixSizeBits);
rangeLength = reader.readBits(rangeSizeBits);
lines.push(new HuffmanLine([currentRangeLow, prefixLength, rangeLength, 0]));
currentRangeLow += 1 << rangeLength;
} while (currentRangeLow < highestValue);
prefixLength = reader.readBits(prefixSizeBits);
lines.push(new HuffmanLine([lowestValue - 1, prefixLength, 32, 0, 'lower']));
prefixLength = reader.readBits(prefixSizeBits);
lines.push(new HuffmanLine([highestValue, prefixLength, 32, 0]));
if (flags & 1) {
prefixLength = reader.readBits(prefixSizeBits);
lines.push(new HuffmanLine([prefixLength, 0]));
}
return new HuffmanTable(lines, false);
}
var standardTablesCache = {};
function getStandardTable(number) {
var table = standardTablesCache[number];
if (table) {
return table;
}
var lines = void 0;
switch (number) {
case 1:
lines = [[0, 1, 4, 0x0], [16, 2, 8, 0x2], [272, 3, 16, 0x6], [65808, 3, 32, 0x7]];
break;
case 2:
lines = [[0, 1, 0, 0x0], [1, 2, 0, 0x2], [2, 3, 0, 0x6], [3, 4, 3, 0xE], [11, 5, 6, 0x1E], [75, 6, 32, 0x3E], [6, 0x3F]];
break;
case 3:
lines = [[-256, 8, 8, 0xFE], [0, 1, 0, 0x0], [1, 2, 0, 0x2], [2, 3, 0, 0x6], [3, 4, 3, 0xE], [11, 5, 6, 0x1E], [-257, 8, 32, 0xFF, 'lower'], [75, 7, 32, 0x7E], [6, 0x3E]];
break;
case 4:
lines = [[1, 1, 0, 0x0], [2, 2, 0, 0x2], [3, 3, 0, 0x6], [4, 4, 3, 0xE], [12, 5, 6, 0x1E], [76, 5, 32, 0x1F]];
break;
case 5:
lines = [[-255, 7, 8, 0x7E], [1, 1, 0, 0x0], [2, 2, 0, 0x2], [3, 3, 0, 0x6], [4, 4, 3, 0xE], [12, 5, 6, 0x1E], [-256, 7, 32, 0x7F, 'lower'], [76, 6, 32, 0x3E]];
break;
case 6:
lines = [[-2048, 5, 10, 0x1C], [-1024, 4, 9, 0x8], [-512, 4, 8, 0x9], [-256, 4, 7, 0xA], [-128, 5, 6, 0x1D], [-64, 5, 5, 0x1E], [-32, 4, 5, 0xB], [0, 2, 7, 0x0], [128, 3, 7, 0x2], [256, 3, 8, 0x3], [512, 4, 9, 0xC], [1024, 4, 10, 0xD], [-2049, 6, 32, 0x3E, 'lower'], [2048, 6, 32, 0x3F]];
break;
case 7:
lines = [[-1024, 4, 9, 0x8], [-512, 3, 8, 0x0], [-256, 4, 7, 0x9], [-128, 5, 6, 0x1A], [-64, 5, 5, 0x1B], [-32, 4, 5, 0xA], [0, 4, 5, 0xB], [32, 5, 5, 0x1C], [64, 5, 6, 0x1D], [128, 4, 7, 0xC], [256, 3, 8, 0x1], [512, 3, 9, 0x2], [1024, 3, 10, 0x3], [-1025, 5, 32, 0x1E, 'lower'], [2048, 5, 32, 0x1F]];
break;
case 8:
lines = [[-15, 8, 3, 0xFC], [-7, 9, 1, 0x1FC], [-5, 8, 1, 0xFD], [-3, 9, 0, 0x1FD], [-2, 7, 0, 0x7C], [-1, 4, 0, 0xA], [0, 2, 1, 0x0], [2, 5, 0, 0x1A], [3, 6, 0, 0x3A], [4, 3, 4, 0x4], [20, 6, 1, 0x3B], [22, 4, 4, 0xB], [38, 4, 5, 0xC], [70, 5, 6, 0x1B], [134, 5, 7, 0x1C], [262, 6, 7, 0x3C], [390, 7, 8, 0x7D], [646, 6, 10, 0x3D], [-16, 9, 32, 0x1FE, 'lower'], [1670, 9, 32, 0x1FF], [2, 0x1]];
break;
case 9:
lines = [[-31, 8, 4, 0xFC], [-15, 9, 2, 0x1FC], [-11, 8, 2, 0xFD], [-7, 9, 1, 0x1FD], [-5, 7, 1, 0x7C], [-3, 4, 1, 0xA], [-1, 3, 1, 0x2], [1, 3, 1, 0x3], [3, 5, 1, 0x1A], [5, 6, 1, 0x3A], [7, 3, 5, 0x4], [39, 6, 2, 0x3B], [43, 4, 5, 0xB], [75, 4, 6, 0xC], [139, 5, 7, 0x1B], [267, 5, 8, 0x1C], [523, 6, 8, 0x3C], [779, 7, 9, 0x7D], [1291, 6, 11, 0x3D], [-32, 9, 32, 0x1FE, 'lower'], [3339, 9, 32, 0x1FF], [2, 0x0]];
break;
case 10:
lines = [[-21, 7, 4, 0x7A], [-5, 8, 0, 0xFC], [-4, 7, 0, 0x7B], [-3, 5, 0, 0x18], [-2, 2, 2, 0x0], [2, 5, 0, 0x19], [3, 6, 0, 0x36], [4, 7, 0, 0x7C], [5, 8, 0, 0xFD], [6, 2, 6, 0x1], [70, 5, 5, 0x1A], [102, 6, 5, 0x37], [134, 6, 6, 0x38], [198, 6, 7, 0x39], [326, 6, 8, 0x3A], [582, 6, 9, 0x3B], [1094, 6, 10, 0x3C], [2118, 7, 11, 0x7D], [-22, 8, 32, 0xFE, 'lower'], [4166, 8, 32, 0xFF], [2, 0x2]];
break;
case 11:
lines = [[1, 1, 0, 0x0], [2, 2, 1, 0x2], [4, 4, 0, 0xC], [5, 4, 1, 0xD], [7, 5, 1, 0x1C], [9, 5, 2, 0x1D], [13, 6, 2, 0x3C], [17, 7, 2, 0x7A], [21, 7, 3, 0x7B], [29, 7, 4, 0x7C], [45, 7, 5, 0x7D], [77, 7, 6, 0x7E], [141, 7, 32, 0x7F]];
break;
case 12:
lines = [[1, 1, 0, 0x0], [2, 2, 0, 0x2], [3, 3, 1, 0x6], [5, 5, 0, 0x1C], [6, 5, 1, 0x1D], [8, 6, 1, 0x3C], [10, 7, 0, 0x7A], [11, 7, 1, 0x7B], [13, 7, 2, 0x7C], [17, 7, 3, 0x7D], [25, 7, 4, 0x7E], [41, 8, 5, 0xFE], [73, 8, 32, 0xFF]];
break;
case 13:
lines = [[1, 1, 0, 0x0], [2, 3, 0, 0x4], [3, 4, 0, 0xC], [4, 5, 0, 0x1C], [5, 4, 1, 0xD], [7, 3, 3, 0x5], [15, 6, 1, 0x3A], [17, 6, 2, 0x3B], [21, 6, 3, 0x3C], [29, 6, 4, 0x3D], [45, 6, 5, 0x3E], [77, 7, 6, 0x7E], [141, 7, 32, 0x7F]];
break;
case 14:
lines = [[-2, 3, 0, 0x4], [-1, 3, 0, 0x5], [0, 1, 0, 0x0], [1, 3, 0, 0x6], [2, 3, 0, 0x7]];
break;
case 15:
lines = [[-24, 7, 4, 0x7C], [-8, 6, 2, 0x3C], [-4, 5, 1, 0x1C], [-2, 4, 0, 0xC], [-1, 3, 0, 0x4], [0, 1, 0, 0x0], [1, 3, 0, 0x5], [2, 4, 0, 0xD], [3, 5, 1, 0x1D], [5, 6, 2, 0x3D], [9, 7, 4, 0x7D], [-25, 7, 32, 0x7E, 'lower'], [25, 7, 32, 0x7F]];
break;
default:
throw new Jbig2Error('standard table B.' + number + ' does not exist');
}
var length = lines.length,
i = void 0;
for (i = 0; i < length; i++) {
lines[i] = new HuffmanLine(lines[i]);
}
table = new HuffmanTable(lines, true);
standardTablesCache[number] = table;
return table;
}
function Reader(data, start, end) {
this.data = data;
this.start = start;
this.end = end;
this.position = start;
this.shift = -1;
this.currentByte = 0;
}
Reader.prototype = {
readBit: function readBit() {
if (this.shift < 0) {
if (this.position >= this.end) {
throw new Jbig2Error('end of data while reading bit');
}
this.currentByte = this.data[this.position++];
this.shift = 7;
}
var bit = this.currentByte >> this.shift & 1;
this.shift--;
return bit;
},
readBits: function readBits(numBits) {
var result = 0,
i = void 0;
for (i = numBits - 1; i >= 0; i--) {
result |= this.readBit() << i;
}
return result;
},
byteAlign: function byteAlign() {
this.shift = -1;
},
next: function next() {
if (this.position >= this.end) {
return -1;
}
return this.data[this.position++];
}
};
function getCustomHuffmanTable(index, referredTo, customTables) {
var currentIndex = 0,
i = void 0,
ii = referredTo.length,
table = void 0;
for (i = 0; i < ii; i++) {
table = customTables[referredTo[i]];
if (table) {
if (index === currentIndex) {
return table;
}
currentIndex++;
}
}
throw new Jbig2Error('can\'t find custom Huffman table');
}
function getTextRegionHuffmanTables(textRegion, referredTo, customTables, numberOfSymbols, reader) {
var codes = [],
i = void 0,
codeLength = void 0;
for (i = 0; i <= 34; i++) {
codeLength = reader.readBits(4);
codes.push(new HuffmanLine([i, codeLength, 0, 0]));
}
var runCodesTable = new HuffmanTable(codes, false);
codes.length = 0;
for (i = 0; i < numberOfSymbols;) {
codeLength = runCodesTable.decode(reader);
if (codeLength >= 32) {
var repeatedLength = void 0,
numberOfRepeats = void 0,
j = void 0;
switch (codeLength) {
case 32:
if (i === 0) {
throw new Jbig2Error('no previous value in symbol ID table');
}
numberOfRepeats = reader.readBits(2) + 3;
repeatedLength = codes[i - 1].prefixLength;
break;
case 33:
numberOfRepeats = reader.readBits(3) + 3;
repeatedLength = 0;
break;
case 34:
numberOfRepeats = reader.readBits(7) + 11;
repeatedLength = 0;
break;
default:
throw new Jbig2Error('invalid code length in symbol ID table');
}
for (j = 0; j < numberOfRepeats; j++) {
codes.push(new HuffmanLine([i, repeatedLength, 0, 0]));
i++;
}
} else {
codes.push(new HuffmanLine([i, codeLength, 0, 0]));
i++;
}
}
reader.byteAlign();
var symbolIDTable = new HuffmanTable(codes, false);
var customIndex = 0,
tableFirstS = void 0,
tableDeltaS = void 0,
tableDeltaT = void 0;
switch (textRegion.huffmanFS) {
case 0:
case 1:
tableFirstS = getStandardTable(textRegion.huffmanFS + 6);
break;
case 3:
tableFirstS = getCustomHuffmanTable(customIndex, referredTo, customTables);
customIndex++;
break;
default:
throw new Jbig2Error('invalid Huffman FS selector');
}
switch (textRegion.huffmanDS) {
case 0:
case 1:
case 2:
tableDeltaS = getStandardTable(textRegion.huffmanDS + 8);
break;
case 3:
tableDeltaS = getCustomHuffmanTable(customIndex, referredTo, customTables);
customIndex++;
break;
default:
throw new Jbig2Error('invalid Huffman DS selector');
}
switch (textRegion.huffmanDT) {
case 0:
case 1:
case 2:
tableDeltaT = getStandardTable(textRegion.huffmanDT + 11);
break;
case 3:
tableDeltaT = getCustomHuffmanTable(customIndex, referredTo, customTables);
customIndex++;
break;
default:
throw new Jbig2Error('invalid Huffman DT selector');
}
if (textRegion.refinement) {
throw new Jbig2Error('refinement with Huffman is not supported');
}
return {
symbolIDTable: symbolIDTable,
tableFirstS: tableFirstS,
tableDeltaS: tableDeltaS,
tableDeltaT: tableDeltaT
};
}
function getSymbolDictionaryHuffmanTables(dictionary, referredTo, customTables) {
var customIndex = 0,
tableDeltaHeight = void 0,
tableDeltaWidth = void 0;
switch (dictionary.huffmanDHSelector) {
case 0:
case 1:
tableDeltaHeight = getStandardTable(dictionary.huffmanDHSelector + 4);
break;
case 3:
tableDeltaHeight = getCustomHuffmanTable(customIndex, referredTo, customTables);
customIndex++;
break;
default:
throw new Jbig2Error('invalid Huffman DH selector');
}
switch (dictionary.huffmanDWSelector) {
case 0:
case 1:
tableDeltaWidth = getStandardTable(dictionary.huffmanDWSelector + 2);
break;
case 3:
tableDeltaWidth = getCustomHuffmanTable(customIndex, referredTo, customTables);
customIndex++;
break;
default:
throw new Jbig2Error('invalid Huffman DW selector');
}
var tableBitmapSize = void 0,
tableAggregateInstances = void 0;
if (dictionary.bitmapSizeSelector) {
tableBitmapSize = getCustomHuffmanTable(customIndex, referredTo, customTables);
customIndex++;
} else {
tableBitmapSize = getStandardTable(1);
}
if (dictionary.aggregationInstancesSelector) {
tableAggregateInstances = getCustomHuffmanTable(customIndex, referredTo, customTables);
} else {
tableAggregateInstances = getStandardTable(1);
}
return {
tableDeltaHeight: tableDeltaHeight,
tableDeltaWidth: tableDeltaWidth,
tableBitmapSize: tableBitmapSize,
tableAggregateInstances: tableAggregateInstances
};
}
function readUncompressedBitmap(reader, width, height) {
var bitmap = [],
x = void 0,
y = void 0,
row = void 0;
for (y = 0; y < height; y++) {
row = new Uint8Array(width);
bitmap.push(row);
for (x = 0; x < width; x++) {
row[x] = reader.readBit();
}
reader.byteAlign();
}
return bitmap;
}
function decodeMMRBitmap(input, width, height, endOfBlock) {
var params = {
K: -1,
Columns: width,
Rows: height,
BlackIs1: true,
EndOfBlock: endOfBlock
};
var decoder = new _ccitt.CCITTFaxDecoder(input, params);
var bitmap = [],
x = void 0,
y = void 0,
row = void 0,
currentByte = void 0,
shift = void 0,
eof = false;
for (y = 0; y < height; y++) {
row = new Uint8Array(width);
bitmap.push(row);
shift = -1;
for (x = 0; x < width; x++) {
if (shift < 0) {
currentByte = decoder.readNextChar();
if (currentByte === -1) {
currentByte = 0;
eof = true;
}
shift = 7;
}
row[x] = currentByte >> shift & 1;
shift--;
}
}
if (endOfBlock && !eof) {
var lookForEOFLimit = 5;
for (var i = 0; i < lookForEOFLimit; i++) {
if (decoder.readNextChar() === -1) {
break;
}
}
}
return bitmap;
}
function Jbig2Image() {}
Jbig2Image.prototype = {
parseChunks: function Jbig2Image_parseChunks(chunks) {
return parseJbig2Chunks(chunks);
}
};
return Jbig2Image;
}();
exports.Jbig2Image = Jbig2Image;