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pdf.js/src/core/cmap.js
Nicholas Nethercote adf58ed687 Represent cid chars using integers, not strings. 
cid chars are 16-bit unsigned integers. Currently we convert them to
single-char strings when inserting them into the CMap, and then convert
them back to integers when extracting them from the CMap. This patch
changes CMap so that cid chars stay in integer format throughout, saving
both time and space.

When loading the PDF from issue #4580, this change reduces peak RSS from
~600 to ~370 MiB. It also improves overall speed on that PDF by ~26%,
going from 724 ms to 533 ms.
2014-08-01 02:35:17 -07:00

897 lines
23 KiB
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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
/* Copyright 2012 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.
*/
/* globals Util, isString, isInt, warn, error, isCmd, isEOF, isName, Lexer,
isStream, StringStream, PDFJS, assert */
'use strict';
var BUILT_IN_CMAPS = [
// << Start unicode maps.
'Adobe-GB1-UCS2',
'Adobe-CNS1-UCS2',
'Adobe-Japan1-UCS2',
'Adobe-Korea1-UCS2',
// >> End unicode maps.
'78-EUC-H',
'78-EUC-V',
'78-H',
'78-RKSJ-H',
'78-RKSJ-V',
'78-V',
'78ms-RKSJ-H',
'78ms-RKSJ-V',
'83pv-RKSJ-H',
'90ms-RKSJ-H',
'90ms-RKSJ-V',
'90msp-RKSJ-H',
'90msp-RKSJ-V',
'90pv-RKSJ-H',
'90pv-RKSJ-V',
'Add-H',
'Add-RKSJ-H',
'Add-RKSJ-V',
'Add-V',
'Adobe-CNS1-0',
'Adobe-CNS1-1',
'Adobe-CNS1-2',
'Adobe-CNS1-3',
'Adobe-CNS1-4',
'Adobe-CNS1-5',
'Adobe-CNS1-6',
'Adobe-GB1-0',
'Adobe-GB1-1',
'Adobe-GB1-2',
'Adobe-GB1-3',
'Adobe-GB1-4',
'Adobe-GB1-5',
'Adobe-Japan1-0',
'Adobe-Japan1-1',
'Adobe-Japan1-2',
'Adobe-Japan1-3',
'Adobe-Japan1-4',
'Adobe-Japan1-5',
'Adobe-Japan1-6',
'Adobe-Korea1-0',
'Adobe-Korea1-1',
'Adobe-Korea1-2',
'B5-H',
'B5-V',
'B5pc-H',
'B5pc-V',
'CNS-EUC-H',
'CNS-EUC-V',
'CNS1-H',
'CNS1-V',
'CNS2-H',
'CNS2-V',
'ETHK-B5-H',
'ETHK-B5-V',
'ETen-B5-H',
'ETen-B5-V',
'ETenms-B5-H',
'ETenms-B5-V',
'EUC-H',
'EUC-V',
'Ext-H',
'Ext-RKSJ-H',
'Ext-RKSJ-V',
'Ext-V',
'GB-EUC-H',
'GB-EUC-V',
'GB-H',
'GB-V',
'GBK-EUC-H',
'GBK-EUC-V',
'GBK2K-H',
'GBK2K-V',
'GBKp-EUC-H',
'GBKp-EUC-V',
'GBT-EUC-H',
'GBT-EUC-V',
'GBT-H',
'GBT-V',
'GBTpc-EUC-H',
'GBTpc-EUC-V',
'GBpc-EUC-H',
'GBpc-EUC-V',
'H',
'HKdla-B5-H',
'HKdla-B5-V',
'HKdlb-B5-H',
'HKdlb-B5-V',
'HKgccs-B5-H',
'HKgccs-B5-V',
'HKm314-B5-H',
'HKm314-B5-V',
'HKm471-B5-H',
'HKm471-B5-V',
'HKscs-B5-H',
'HKscs-B5-V',
'Hankaku',
'Hiragana',
'KSC-EUC-H',
'KSC-EUC-V',
'KSC-H',
'KSC-Johab-H',
'KSC-Johab-V',
'KSC-V',
'KSCms-UHC-H',
'KSCms-UHC-HW-H',
'KSCms-UHC-HW-V',
'KSCms-UHC-V',
'KSCpc-EUC-H',
'KSCpc-EUC-V',
'Katakana',
'NWP-H',
'NWP-V',
'RKSJ-H',
'RKSJ-V',
'Roman',
'UniCNS-UCS2-H',
'UniCNS-UCS2-V',
'UniCNS-UTF16-H',
'UniCNS-UTF16-V',
'UniCNS-UTF32-H',
'UniCNS-UTF32-V',
'UniCNS-UTF8-H',
'UniCNS-UTF8-V',
'UniGB-UCS2-H',
'UniGB-UCS2-V',
'UniGB-UTF16-H',
'UniGB-UTF16-V',
'UniGB-UTF32-H',
'UniGB-UTF32-V',
'UniGB-UTF8-H',
'UniGB-UTF8-V',
'UniJIS-UCS2-H',
'UniJIS-UCS2-HW-H',
'UniJIS-UCS2-HW-V',
'UniJIS-UCS2-V',
'UniJIS-UTF16-H',
'UniJIS-UTF16-V',
'UniJIS-UTF32-H',
'UniJIS-UTF32-V',
'UniJIS-UTF8-H',
'UniJIS-UTF8-V',
'UniJIS2004-UTF16-H',
'UniJIS2004-UTF16-V',
'UniJIS2004-UTF32-H',
'UniJIS2004-UTF32-V',
'UniJIS2004-UTF8-H',
'UniJIS2004-UTF8-V',
'UniJISPro-UCS2-HW-V',
'UniJISPro-UCS2-V',
'UniJISPro-UTF8-V',
'UniJISX0213-UTF32-H',
'UniJISX0213-UTF32-V',
'UniJISX02132004-UTF32-H',
'UniJISX02132004-UTF32-V',
'UniKS-UCS2-H',
'UniKS-UCS2-V',
'UniKS-UTF16-H',
'UniKS-UTF16-V',
'UniKS-UTF32-H',
'UniKS-UTF32-V',
'UniKS-UTF8-H',
'UniKS-UTF8-V',
'V',
'WP-Symbol'];
// CMap, not to be confused with TrueType's cmap.
var CMap = (function CMapClosure() {
function CMap(builtInCMap) {
// Codespace ranges are stored as follows:
// [[1BytePairs], [2BytePairs], [3BytePairs], [4BytePairs]]
// where nBytePairs are ranges e.g. [low1, high1, low2, high2, ...]
this.codespaceRanges = [[], [], [], []];
this.numCodespaceRanges = 0;
// Map entries have one of two forms.
// - cid chars are 16-bit unsigned integers, stored as integers.
// - bf chars are variable-length byte sequences, stored as strings, with
// one byte per character.
this._map = [];
this.vertical = false;
this.useCMap = null;
this.builtInCMap = builtInCMap;
}
CMap.prototype = {
addCodespaceRange: function(n, low, high) {
this.codespaceRanges[n - 1].push(low, high);
this.numCodespaceRanges++;
},
mapCidRange: function(low, high, dstLow) {
while (low <= high) {
this._map[low++] = dstLow++;
}
},
mapBfRange: function(low, high, dstLow) {
var lastByte = dstLow.length - 1;
while (low <= high) {
this._map[low++] = dstLow;
// Only the last byte has to be incremented.
dstLow = dstLow.substr(0, lastByte) +
String.fromCharCode(dstLow.charCodeAt(lastByte) + 1);
}
},
mapBfRangeToArray: function(low, high, array) {
var i = 0, ii = array.length;
while (low <= high && i < ii) {
this._map[low] = array[i++];
++low;
}
},
// This is used for both bf and cid chars.
mapOne: function(src, dst) {
this._map[src] = dst;
},
lookup: function(code) {
return this._map[code];
},
contains: function(code) {
return this._map[code] !== undefined;
},
forEach: function(callback) {
// Most maps have fewer than 65536 entries, and for those we use normal
// array iteration. But really sparse tables are possible -- e.g. with
// indices in the *billions*. For such tables we use for..in, which isn't
// ideal because it stringifies the indices for all present elements, but
// it does avoid iterating over every undefined entry.
var map = this._map;
var length = map.length;
var i;
if (length <= 0x10000) {
for (i = 0; i < length; i++) {
if (map[i] !== undefined) {
callback(i, map[i]);
}
}
} else {
for (i in this._map) {
callback(i, map[i]);
}
}
},
charCodeOf: function(value) {
return this._map.indexOf(value);
},
getMap: function() {
return this._map;
},
readCharCode: function(str, offset) {
var c = 0;
var codespaceRanges = this.codespaceRanges;
var codespaceRangesLen = this.codespaceRanges.length;
// 9.7.6.2 CMap Mapping
// The code length is at most 4.
for (var n = 0; n < codespaceRangesLen; n++) {
c = ((c << 8) | str.charCodeAt(offset + n)) >>> 0;
// Check each codespace range to see if it falls within.
var codespaceRange = codespaceRanges[n];
for (var k = 0, kk = codespaceRange.length; k < kk;) {
var low = codespaceRange[k++];
var high = codespaceRange[k++];
if (c >= low && c <= high) {
return [c, n + 1];
}
}
}
return [0, 1];
}
};
return CMap;
})();
var IdentityCMap = (function IdentityCMapClosure() {
function IdentityCMap(vertical, n) {
CMap.call(this);
this.vertical = vertical;
this.addCodespaceRange(n, 0, 0xffff);
this.mapCidRange(0, 0xffff, 0);
}
Util.inherit(IdentityCMap, CMap, {});
return IdentityCMap;
})();
var BinaryCMapReader = (function BinaryCMapReaderClosure() {
function fetchBinaryData(url) {
var nonBinaryRequest = PDFJS.disableWorker;
var request = new XMLHttpRequest();
request.open('GET', url, false);
if (!nonBinaryRequest) {
try {
request.responseType = 'arraybuffer';
nonBinaryRequest = request.responseType !== 'arraybuffer';
} catch (e) {
nonBinaryRequest = true;
}
}
if (nonBinaryRequest && request.overrideMimeType) {
request.overrideMimeType('text/plain; charset=x-user-defined');
}
request.send(null);
if (request.status === 0 && /^https?:/i.test(url)) {
error('Unable to get binary cMap at: ' + url);
}
if (nonBinaryRequest) {
var data = Array.prototype.map.call(request.responseText, function (ch) {
return ch.charCodeAt(0) & 255;
});
return new Uint8Array(data);
}
return new Uint8Array(request.response);
}
function hexToInt(a, size) {
var n = 0;
for (var i = 0; i <= size; i++) {
n = (n << 8) | a[i];
}
return n >>> 0;
}
function hexToStr(a, size) {
return String.fromCharCode.apply(null, a.subarray(0, size + 1));
}
function addHex(a, b, size) {
var c = 0;
for (var i = size; i >= 0; i--) {
c += a[i] + b[i];
a[i] = c & 255;
c >>= 8;
}
}
function incHex(a, size) {
var c = 1;
for (var i = size; i >= 0 && c > 0; i--) {
c += a[i];
a[i] = c & 255;
c >>= 8;
}
}
var MAX_NUM_SIZE = 16;
var MAX_ENCODED_NUM_SIZE = 19; // ceil(MAX_NUM_SIZE * 7 / 8)
function BinaryCMapStream(data) {
this.buffer = data;
this.pos = 0;
this.end = data.length;
this.tmpBuf = new Uint8Array(MAX_ENCODED_NUM_SIZE);
}
BinaryCMapStream.prototype = {
readByte: function () {
if (this.pos >= this.end) {
return -1;
}
return this.buffer[this.pos++];
},
readNumber: function () {
var n = 0;
var last;
do {
var b = this.readByte();
if (b < 0) {
error('unexpected EOF in bcmap');
}
last = !(b & 0x80);
n = (n << 7) | (b & 0x7F);
} while (!last);
return n;
},
readSigned: function () {
var n = this.readNumber();
return (n & 1) ? ~(n >>> 1) : n >>> 1;
},
readHex: function (num, size) {
num.set(this.buffer.subarray(this.pos,
this.pos + size + 1));
this.pos += size + 1;
},
readHexNumber: function (num, size) {
var last;
var stack = this.tmpBuf, sp = 0;
do {
var b = this.readByte();
if (b < 0) {
error('unexpected EOF in bcmap');
}
last = !(b & 0x80);
stack[sp++] = b & 0x7F;
} while (!last);
var i = size, buffer = 0, bufferSize = 0;
while (i >= 0) {
while (bufferSize < 8 && stack.length > 0) {
buffer = (stack[--sp] << bufferSize) | buffer;
bufferSize += 7;
}
num[i] = buffer & 255;
i--;
buffer >>= 8;
bufferSize -= 8;
}
},
readHexSigned: function (num, size) {
this.readHexNumber(num, size);
var sign = num[size] & 1 ? 255 : 0;
var c = 0;
for (var i = 0; i <= size; i++) {
c = ((c & 1) << 8) | num[i];
num[i] = (c >> 1) ^ sign;
}
},
readString: function () {
var len = this.readNumber();
var s = '';
for (var i = 0; i < len; i++) {
s += String.fromCharCode(this.readNumber());
}
return s;
}
};
function processBinaryCMap(url, cMap, extend) {
var data = fetchBinaryData(url);
var stream = new BinaryCMapStream(data);
var header = stream.readByte();
cMap.vertical = !!(header & 1);
var useCMap = null;
var start = new Uint8Array(MAX_NUM_SIZE);
var end = new Uint8Array(MAX_NUM_SIZE);
var char = new Uint8Array(MAX_NUM_SIZE);
var charCode = new Uint8Array(MAX_NUM_SIZE);
var tmp = new Uint8Array(MAX_NUM_SIZE);
var code;
var b;
while ((b = stream.readByte()) >= 0) {
var type = b >> 5;
if (type === 7) { // metadata, e.g. comment or usecmap
switch (b & 0x1F) {
case 0:
stream.readString(); // skipping comment
break;
case 1:
useCMap = stream.readString();
break;
}
continue;
}
var sequence = !!(b & 0x10);
var dataSize = b & 15;
assert(dataSize + 1 <= MAX_NUM_SIZE);
var ucs2DataSize = 1;
var subitemsCount = stream.readNumber();
var i;
switch (type) {
case 0: // codespacerange
stream.readHex(start, dataSize);
stream.readHexNumber(end, dataSize);
addHex(end, start, dataSize);
cMap.addCodespaceRange(dataSize + 1, hexToInt(start, dataSize),
hexToInt(end, dataSize));
for (i = 1; i < subitemsCount; i++) {
incHex(end, dataSize);
stream.readHexNumber(start, dataSize);
addHex(start, end, dataSize);
stream.readHexNumber(end, dataSize);
addHex(end, start, dataSize);
cMap.addCodespaceRange(dataSize + 1, hexToInt(start, dataSize),
hexToInt(end, dataSize));
}
break;
case 1: // notdefrange
stream.readHex(start, dataSize);
stream.readHexNumber(end, dataSize);
addHex(end, start, dataSize);
code = stream.readNumber();
// undefined range, skipping
for (i = 1; i < subitemsCount; i++) {
incHex(end, dataSize);
stream.readHexNumber(start, dataSize);
addHex(start, end, dataSize);
stream.readHexNumber(end, dataSize);
addHex(end, start, dataSize);
code = stream.readNumber();
// nop
}
break;
case 2: // cidchar
stream.readHex(char, dataSize);
code = stream.readNumber();
cMap.mapOne(hexToInt(char, dataSize), code);
for (i = 1; i < subitemsCount; i++) {
incHex(char, dataSize);
if (!sequence) {
stream.readHexNumber(tmp, dataSize);
addHex(char, tmp, dataSize);
}
code = stream.readSigned() + (code + 1);
cMap.mapOne(hexToInt(char, dataSize), code);
}
break;
case 3: // cidrange
stream.readHex(start, dataSize);
stream.readHexNumber(end, dataSize);
addHex(end, start, dataSize);
code = stream.readNumber();
cMap.mapCidRange(hexToInt(start, dataSize), hexToInt(end, dataSize),
code);
for (i = 1; i < subitemsCount; i++) {
incHex(end, dataSize);
if (!sequence) {
stream.readHexNumber(start, dataSize);
addHex(start, end, dataSize);
} else {
start.set(end);
}
stream.readHexNumber(end, dataSize);
addHex(end, start, dataSize);
code = stream.readNumber();
cMap.mapCidRange(hexToInt(start, dataSize), hexToInt(end, dataSize),
code);
}
break;
case 4: // bfchar
stream.readHex(char, ucs2DataSize);
stream.readHex(charCode, dataSize);
cMap.mapOne(hexToInt(char, ucs2DataSize),
hexToStr(charCode, dataSize));
for (i = 1; i < subitemsCount; i++) {
incHex(char, ucs2DataSize);
if (!sequence) {
stream.readHexNumber(tmp, ucs2DataSize);
addHex(char, tmp, ucs2DataSize);
}
incHex(charCode, dataSize);
stream.readHexSigned(tmp, dataSize);
addHex(charCode, tmp, dataSize);
cMap.mapOne(hexToInt(char, ucs2DataSize),
hexToStr(charCode, dataSize));
}
break;
case 5: // bfrange
stream.readHex(start, ucs2DataSize);
stream.readHexNumber(end, ucs2DataSize);
addHex(end, start, ucs2DataSize);
stream.readHex(charCode, dataSize);
cMap.mapBfRange(hexToInt(start, ucs2DataSize),
hexToInt(end, ucs2DataSize),
hexToStr(charCode, dataSize));
for (i = 1; i < subitemsCount; i++) {
incHex(end, ucs2DataSize);
if (!sequence) {
stream.readHexNumber(start, ucs2DataSize);
addHex(start, end, ucs2DataSize);
} else {
start.set(end);
}
stream.readHexNumber(end, ucs2DataSize);
addHex(end, start, ucs2DataSize);
stream.readHex(charCode, dataSize);
cMap.mapBfRange(hexToInt(start, ucs2DataSize),
hexToInt(end, ucs2DataSize),
hexToStr(charCode, dataSize));
}
break;
default:
error('Unknown type: ' + type);
break;
}
}
if (useCMap) {
extend(useCMap);
}
return cMap;
}
function BinaryCMapReader() {}
BinaryCMapReader.prototype = {
read: processBinaryCMap
};
return BinaryCMapReader;
})();
var CMapFactory = (function CMapFactoryClosure() {
function strToInt(str) {
var a = 0;
for (var i = 0; i < str.length; i++) {
a = (a << 8) | str.charCodeAt(i);
}
return a >>> 0;
}
function expectString(obj) {
if (!isString(obj)) {
error('Malformed CMap: expected string.');
}
}
function expectInt(obj) {
if (!isInt(obj)) {
error('Malformed CMap: expected int.');
}
}
function parseBfChar(cMap, lexer) {
while (true) {
var obj = lexer.getObj();
if (isEOF(obj)) {
break;
}
if (isCmd(obj, 'endbfchar')) {
return;
}
expectString(obj);
var src = strToInt(obj);
obj = lexer.getObj();
// TODO are /dstName used?
expectString(obj);
var dst = obj;
cMap.mapOne(src, dst);
}
}
function parseBfRange(cMap, lexer) {
while (true) {
var obj = lexer.getObj();
if (isEOF(obj)) {
break;
}
if (isCmd(obj, 'endbfrange')) {
return;
}
expectString(obj);
var low = strToInt(obj);
obj = lexer.getObj();
expectString(obj);
var high = strToInt(obj);
obj = lexer.getObj();
if (isInt(obj) || isString(obj)) {
var dstLow = isInt(obj) ? String.fromCharCode(obj) : obj;
cMap.mapBfRange(low, high, dstLow);
} else if (isCmd(obj, '[')) {
obj = lexer.getObj();
var array = [];
while (!isCmd(obj, ']') && !isEOF(obj)) {
array.push(obj);
obj = lexer.getObj();
}
cMap.mapBfRangeToArray(low, high, array);
} else {
break;
}
}
error('Invalid bf range.');
}
function parseCidChar(cMap, lexer) {
while (true) {
var obj = lexer.getObj();
if (isEOF(obj)) {
break;
}
if (isCmd(obj, 'endcidchar')) {
return;
}
expectString(obj);
var src = strToInt(obj);
obj = lexer.getObj();
expectInt(obj);
var dst = obj;
cMap.mapOne(src, dst);
}
}
function parseCidRange(cMap, lexer) {
while (true) {
var obj = lexer.getObj();
if (isEOF(obj)) {
break;
}
if (isCmd(obj, 'endcidrange')) {
return;
}
expectString(obj);
var low = strToInt(obj);
obj = lexer.getObj();
expectString(obj);
var high = strToInt(obj);
obj = lexer.getObj();
expectInt(obj);
var dstLow = obj;
cMap.mapCidRange(low, high, dstLow);
}
}
function parseCodespaceRange(cMap, lexer) {
while (true) {
var obj = lexer.getObj();
if (isEOF(obj)) {
break;
}
if (isCmd(obj, 'endcodespacerange')) {
return;
}
if (!isString(obj)) {
break;
}
var low = strToInt(obj);
obj = lexer.getObj();
if (!isString(obj)) {
break;
}
var high = strToInt(obj);
cMap.addCodespaceRange(obj.length, low, high);
}
error('Invalid codespace range.');
}
function parseWMode(cMap, lexer) {
var obj = lexer.getObj();
if (isInt(obj)) {
cMap.vertical = !!obj;
}
}
function parseCMap(cMap, lexer, builtInCMapParams, useCMap) {
var previous;
var embededUseCMap;
objLoop: while (true) {
var obj = lexer.getObj();
if (isEOF(obj)) {
break;
} else if (isName(obj)) {
if (obj.name === 'WMode') {
parseWMode(cMap, lexer);
}
previous = obj;
} else if (isCmd(obj)) {
switch (obj.cmd) {
case 'endcmap':
break objLoop;
case 'usecmap':
if (isName(previous)) {
embededUseCMap = previous.name;
}
break;
case 'begincodespacerange':
parseCodespaceRange(cMap, lexer);
break;
case 'beginbfchar':
parseBfChar(cMap, lexer);
break;
case 'begincidchar':
parseCidChar(cMap, lexer);
break;
case 'beginbfrange':
parseBfRange(cMap, lexer);
break;
case 'begincidrange':
parseCidRange(cMap, lexer);
break;
}
}
}
if (!useCMap && embededUseCMap) {
// Load the usecmap definition from the file only if there wasn't one
// specified.
useCMap = embededUseCMap;
}
if (useCMap) {
extendCMap(cMap, builtInCMapParams, useCMap);
}
}
function extendCMap(cMap, builtInCMapParams, useCMap) {
cMap.useCMap = createBuiltInCMap(useCMap, builtInCMapParams);
// If there aren't any code space ranges defined clone all the parent ones
// into this cMap.
if (cMap.numCodespaceRanges === 0) {
var useCodespaceRanges = cMap.useCMap.codespaceRanges;
for (var i = 0; i < useCodespaceRanges.length; i++) {
cMap.codespaceRanges[i] = useCodespaceRanges[i].slice();
}
cMap.numCodespaceRanges = cMap.useCMap.numCodespaceRanges;
}
// Merge the map into the current one, making sure not to override
// any previously defined entries.
cMap.useCMap.forEach(function(key, value) {
if (!cMap.contains(key)) {
cMap.mapOne(key, cMap.useCMap.lookup(key));
}
});
}
function parseBinaryCMap(name, builtInCMapParams) {
var url = builtInCMapParams.url + name + '.bcmap';
var cMap = new CMap(true);
new BinaryCMapReader().read(url, cMap, function (useCMap) {
extendCMap(cMap, builtInCMapParams, useCMap);
});
return cMap;
}
function createBuiltInCMap(name, builtInCMapParams) {
if (name === 'Identity-H') {
return new IdentityCMap(false, 2);
} else if (name === 'Identity-V') {
return new IdentityCMap(true, 2);
}
if (BUILT_IN_CMAPS.indexOf(name) === -1) {
error('Unknown cMap name: ' + name);
}
assert(builtInCMapParams, 'built-in cMap parameters are not provided');
if (builtInCMapParams.packed) {
return parseBinaryCMap(name, builtInCMapParams);
}
var request = new XMLHttpRequest();
var url = builtInCMapParams.url + name;
request.open('GET', url, false);
request.send(null);
if (request.status === 0 && /^https?:/i.test(url)) {
error('Unable to get cMap at: ' + url);
}
var cMap = new CMap(true);
var lexer = new Lexer(new StringStream(request.responseText));
parseCMap(cMap, lexer, builtInCMapParams, null);
return cMap;
}
return {
create: function (encoding, builtInCMapParams, useCMap) {
if (isName(encoding)) {
return createBuiltInCMap(encoding.name, builtInCMapParams);
} else if (isStream(encoding)) {
var cMap = new CMap();
var lexer = new Lexer(encoding);
try {
parseCMap(cMap, lexer, builtInCMapParams, useCMap);
} catch (e) {
warn('Invalid CMap data. ' + e);
}
return cMap;
}
error('Encoding required.');
}
};
})();
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