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pdf.js/src/core/fonts.js
Tim van der Meij 4111871ac5
Merge pull request #9958 from brendandahl/always-fallback 
Always fallback to system font on font failure.
2018-08-05 19:58:48 +02:00

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/* 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.
*/
import {
assert, bytesToString, FONT_IDENTITY_MATRIX, FontType, FormatError, info,
isNum, isSpace, MissingDataException, readUint32, shadow, string32,
unreachable, warn
} from '../shared/util';
import {
CFF, CFFCharset, CFFCompiler, CFFHeader, CFFIndex, CFFParser, CFFPrivateDict,
CFFStandardStrings, CFFStrings, CFFTopDict
} from './cff_parser';
import { getDingbatsGlyphsUnicode, getGlyphsUnicode } from './glyphlist';
import {
getEncoding, MacRomanEncoding, StandardEncoding, SymbolSetEncoding,
ZapfDingbatsEncoding
} from './encodings';
import {
getGlyphMapForStandardFonts, getNonStdFontMap, getStdFontMap,
getSupplementalGlyphMapForArialBlack, getSupplementalGlyphMapForCalibri
} from './standard_fonts';
import {
getUnicodeForGlyph, getUnicodeRangeFor, mapSpecialUnicodeValues
} from './unicode';
import { FontRendererFactory } from './font_renderer';
import { IdentityCMap } from './cmap';
import { Stream } from './stream';
import { Type1Parser } from './type1_parser';
// Unicode Private Use Area
var PRIVATE_USE_OFFSET_START = 0xE000;
var PRIVATE_USE_OFFSET_END = 0xF8FF;
var SKIP_PRIVATE_USE_RANGE_F000_TO_F01F = false;
// PDF Glyph Space Units are one Thousandth of a TextSpace Unit
// except for Type 3 fonts
var PDF_GLYPH_SPACE_UNITS = 1000;
// Accented characters are not displayed properly on Windows, using this flag
// to control analysis of seac charstrings.
var SEAC_ANALYSIS_ENABLED = false;
var FontFlags = {
FixedPitch: 1,
Serif: 2,
Symbolic: 4,
Script: 8,
Nonsymbolic: 32,
Italic: 64,
AllCap: 65536,
SmallCap: 131072,
ForceBold: 262144,
};
var MacStandardGlyphOrdering = [
'.notdef', '.null', 'nonmarkingreturn', 'space', 'exclam', 'quotedbl',
'numbersign', 'dollar', 'percent', 'ampersand', 'quotesingle', 'parenleft',
'parenright', 'asterisk', 'plus', 'comma', 'hyphen', 'period', 'slash',
'zero', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight',
'nine', 'colon', 'semicolon', 'less', 'equal', 'greater', 'question', 'at',
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'bracketleft',
'backslash', 'bracketright', 'asciicircum', 'underscore', 'grave', 'a', 'b',
'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'braceleft', 'bar', 'braceright',
'asciitilde', 'Adieresis', 'Aring', 'Ccedilla', 'Eacute', 'Ntilde',
'Odieresis', 'Udieresis', 'aacute', 'agrave', 'acircumflex', 'adieresis',
'atilde', 'aring', 'ccedilla', 'eacute', 'egrave', 'ecircumflex', 'edieresis',
'iacute', 'igrave', 'icircumflex', 'idieresis', 'ntilde', 'oacute', 'ograve',
'ocircumflex', 'odieresis', 'otilde', 'uacute', 'ugrave', 'ucircumflex',
'udieresis', 'dagger', 'degree', 'cent', 'sterling', 'section', 'bullet',
'paragraph', 'germandbls', 'registered', 'copyright', 'trademark', 'acute',
'dieresis', 'notequal', 'AE', 'Oslash', 'infinity', 'plusminus', 'lessequal',
'greaterequal', 'yen', 'mu', 'partialdiff', 'summation', 'product', 'pi',
'integral', 'ordfeminine', 'ordmasculine', 'Omega', 'ae', 'oslash',
'questiondown', 'exclamdown', 'logicalnot', 'radical', 'florin',
'approxequal', 'Delta', 'guillemotleft', 'guillemotright', 'ellipsis',
'nonbreakingspace', 'Agrave', 'Atilde', 'Otilde', 'OE', 'oe', 'endash',
'emdash', 'quotedblleft', 'quotedblright', 'quoteleft', 'quoteright',
'divide', 'lozenge', 'ydieresis', 'Ydieresis', 'fraction', 'currency',
'guilsinglleft', 'guilsinglright', 'fi', 'fl', 'daggerdbl', 'periodcentered',
'quotesinglbase', 'quotedblbase', 'perthousand', 'Acircumflex',
'Ecircumflex', 'Aacute', 'Edieresis', 'Egrave', 'Iacute', 'Icircumflex',
'Idieresis', 'Igrave', 'Oacute', 'Ocircumflex', 'apple', 'Ograve', 'Uacute',
'Ucircumflex', 'Ugrave', 'dotlessi', 'circumflex', 'tilde', 'macron',
'breve', 'dotaccent', 'ring', 'cedilla', 'hungarumlaut', 'ogonek', 'caron',
'Lslash', 'lslash', 'Scaron', 'scaron', 'Zcaron', 'zcaron', 'brokenbar',
'Eth', 'eth', 'Yacute', 'yacute', 'Thorn', 'thorn', 'minus', 'multiply',
'onesuperior', 'twosuperior', 'threesuperior', 'onehalf', 'onequarter',
'threequarters', 'franc', 'Gbreve', 'gbreve', 'Idotaccent', 'Scedilla',
'scedilla', 'Cacute', 'cacute', 'Ccaron', 'ccaron', 'dcroat'];
function adjustWidths(properties) {
if (!properties.fontMatrix) {
return;
}
if (properties.fontMatrix[0] === FONT_IDENTITY_MATRIX[0]) {
return;
}
// adjusting width to fontMatrix scale
var scale = 0.001 / properties.fontMatrix[0];
var glyphsWidths = properties.widths;
for (var glyph in glyphsWidths) {
glyphsWidths[glyph] *= scale;
}
properties.defaultWidth *= scale;
}
function adjustToUnicode(properties, builtInEncoding) {
if (properties.hasIncludedToUnicodeMap) {
return; // The font dictionary has a `ToUnicode` entry.
}
if (properties.hasEncoding) {
return; // The font dictionary has an `Encoding` entry.
}
if (builtInEncoding === properties.defaultEncoding) {
return; // No point in trying to adjust `toUnicode` if the encodings match.
}
if (properties.toUnicode instanceof IdentityToUnicodeMap) {
return;
}
var toUnicode = [], glyphsUnicodeMap = getGlyphsUnicode();
for (var charCode in builtInEncoding) {
var glyphName = builtInEncoding[charCode];
var unicode = getUnicodeForGlyph(glyphName, glyphsUnicodeMap);
if (unicode !== -1) {
toUnicode[charCode] = String.fromCharCode(unicode);
}
}
properties.toUnicode.amend(toUnicode);
}
function getFontType(type, subtype) {
switch (type) {
case 'Type1':
return subtype === 'Type1C' ? FontType.TYPE1C : FontType.TYPE1;
case 'CIDFontType0':
return subtype === 'CIDFontType0C' ? FontType.CIDFONTTYPE0C :
FontType.CIDFONTTYPE0;
case 'OpenType':
return FontType.OPENTYPE;
case 'TrueType':
return FontType.TRUETYPE;
case 'CIDFontType2':
return FontType.CIDFONTTYPE2;
case 'MMType1':
return FontType.MMTYPE1;
case 'Type0':
return FontType.TYPE0;
default:
return FontType.UNKNOWN;
}
}
// Some bad PDF generators, e.g. Scribus PDF, include glyph names
// in a 'uniXXXX' format -- attempting to recover proper ones.
function recoverGlyphName(name, glyphsUnicodeMap) {
if (glyphsUnicodeMap[name] !== undefined) {
return name;
}
// The glyph name is non-standard, trying to recover.
var unicode = getUnicodeForGlyph(name, glyphsUnicodeMap);
if (unicode !== -1) {
for (var key in glyphsUnicodeMap) {
if (glyphsUnicodeMap[key] === unicode) {
return key;
}
}
}
info('Unable to recover a standard glyph name for: ' + name);
return name;
}
var Glyph = (function GlyphClosure() {
function Glyph(fontChar, unicode, accent, width, vmetric, operatorListId,
isSpace, isInFont) {
this.fontChar = fontChar;
this.unicode = unicode;
this.accent = accent;
this.width = width;
this.vmetric = vmetric;
this.operatorListId = operatorListId;
this.isSpace = isSpace;
this.isInFont = isInFont;
}
Glyph.prototype.matchesForCache = function(fontChar, unicode, accent, width,
vmetric, operatorListId, isSpace,
isInFont) {
return this.fontChar === fontChar &&
this.unicode === unicode &&
this.accent === accent &&
this.width === width &&
this.vmetric === vmetric &&
this.operatorListId === operatorListId &&
this.isSpace === isSpace &&
this.isInFont === isInFont;
};
return Glyph;
})();
var ToUnicodeMap = (function ToUnicodeMapClosure() {
function ToUnicodeMap(cmap = []) {
// The elements of this._map can be integers or strings, depending on how
// `cmap` was created.
this._map = cmap;
}
ToUnicodeMap.prototype = {
get length() {
return this._map.length;
},
forEach(callback) {
for (var charCode in this._map) {
callback(charCode, this._map[charCode].charCodeAt(0));
}
},
has(i) {
return this._map[i] !== undefined;
},
get(i) {
return this._map[i];
},
charCodeOf(value) {
// `Array.prototype.indexOf` is *extremely* inefficient for arrays which
// are both very sparse and very large (see issue8372.pdf).
let map = this._map;
if (map.length <= 0x10000) {
return map.indexOf(value);
}
for (let charCode in map) {
if (map[charCode] === value) {
return (charCode | 0);
}
}
return -1;
},
amend(map) {
for (var charCode in map) {
this._map[charCode] = map[charCode];
}
},
};
return ToUnicodeMap;
})();
var IdentityToUnicodeMap = (function IdentityToUnicodeMapClosure() {
function IdentityToUnicodeMap(firstChar, lastChar) {
this.firstChar = firstChar;
this.lastChar = lastChar;
}
IdentityToUnicodeMap.prototype = {
get length() {
return (this.lastChar + 1) - this.firstChar;
},
forEach(callback) {
for (var i = this.firstChar, ii = this.lastChar; i <= ii; i++) {
callback(i, i);
}
},
has(i) {
return this.firstChar <= i && i <= this.lastChar;
},
get(i) {
if (this.firstChar <= i && i <= this.lastChar) {
return String.fromCharCode(i);
}
return undefined;
},
charCodeOf(v) {
return (Number.isInteger(v) &&
v >= this.firstChar && v <= this.lastChar) ? v : -1;
},
amend(map) {
unreachable('Should not call amend()');
},
};
return IdentityToUnicodeMap;
})();
var OpenTypeFileBuilder = (function OpenTypeFileBuilderClosure() {
function writeInt16(dest, offset, num) {
dest[offset] = (num >> 8) & 0xFF;
dest[offset + 1] = num & 0xFF;
}
function writeInt32(dest, offset, num) {
dest[offset] = (num >> 24) & 0xFF;
dest[offset + 1] = (num >> 16) & 0xFF;
dest[offset + 2] = (num >> 8) & 0xFF;
dest[offset + 3] = num & 0xFF;
}
function writeData(dest, offset, data) {
var i, ii;
if (data instanceof Uint8Array) {
dest.set(data, offset);
} else if (typeof data === 'string') {
for (i = 0, ii = data.length; i < ii; i++) {
dest[offset++] = data.charCodeAt(i) & 0xFF;
}
} else {
// treating everything else as array
for (i = 0, ii = data.length; i < ii; i++) {
dest[offset++] = data[i] & 0xFF;
}
}
}
function OpenTypeFileBuilder(sfnt) {
this.sfnt = sfnt;
this.tables = Object.create(null);
}
OpenTypeFileBuilder.getSearchParams =
function OpenTypeFileBuilder_getSearchParams(entriesCount, entrySize) {
var maxPower2 = 1, log2 = 0;
while ((maxPower2 ^ entriesCount) > maxPower2) {
maxPower2 <<= 1;
log2++;
}
var searchRange = maxPower2 * entrySize;
return {
range: searchRange,
entry: log2,
rangeShift: entrySize * entriesCount - searchRange,
};
};
var OTF_HEADER_SIZE = 12;
var OTF_TABLE_ENTRY_SIZE = 16;
OpenTypeFileBuilder.prototype = {
toArray: function OpenTypeFileBuilder_toArray() {
var sfnt = this.sfnt;
// Tables needs to be written by ascendant alphabetic order
var tables = this.tables;
var tablesNames = Object.keys(tables);
tablesNames.sort();
var numTables = tablesNames.length;
var i, j, jj, table, tableName;
// layout the tables data
var offset = OTF_HEADER_SIZE + numTables * OTF_TABLE_ENTRY_SIZE;
var tableOffsets = [offset];
for (i = 0; i < numTables; i++) {
table = tables[tablesNames[i]];
var paddedLength = ((table.length + 3) & ~3) >>> 0;
offset += paddedLength;
tableOffsets.push(offset);
}
var file = new Uint8Array(offset);
// write the table data first (mostly for checksum)
for (i = 0; i < numTables; i++) {
table = tables[tablesNames[i]];
writeData(file, tableOffsets[i], table);
}
// sfnt version (4 bytes)
if (sfnt === 'true') {
// Windows hates the Mac TrueType sfnt version number
sfnt = string32(0x00010000);
}
file[0] = sfnt.charCodeAt(0) & 0xFF;
file[1] = sfnt.charCodeAt(1) & 0xFF;
file[2] = sfnt.charCodeAt(2) & 0xFF;
file[3] = sfnt.charCodeAt(3) & 0xFF;
// numTables (2 bytes)
writeInt16(file, 4, numTables);
var searchParams = OpenTypeFileBuilder.getSearchParams(numTables, 16);
// searchRange (2 bytes)
writeInt16(file, 6, searchParams.range);
// entrySelector (2 bytes)
writeInt16(file, 8, searchParams.entry);
// rangeShift (2 bytes)
writeInt16(file, 10, searchParams.rangeShift);
offset = OTF_HEADER_SIZE;
// writing table entries
for (i = 0; i < numTables; i++) {
tableName = tablesNames[i];
file[offset] = tableName.charCodeAt(0) & 0xFF;
file[offset + 1] = tableName.charCodeAt(1) & 0xFF;
file[offset + 2] = tableName.charCodeAt(2) & 0xFF;
file[offset + 3] = tableName.charCodeAt(3) & 0xFF;
// checksum
var checksum = 0;
for (j = tableOffsets[i], jj = tableOffsets[i + 1]; j < jj; j += 4) {
var quad = readUint32(file, j);
checksum = (checksum + quad) >>> 0;
}
writeInt32(file, offset + 4, checksum);
// offset
writeInt32(file, offset + 8, tableOffsets[i]);
// length
writeInt32(file, offset + 12, tables[tableName].length);
offset += OTF_TABLE_ENTRY_SIZE;
}
return file;
},
addTable: function OpenTypeFileBuilder_addTable(tag, data) {
if (tag in this.tables) {
throw new Error('Table ' + tag + ' already exists');
}
this.tables[tag] = data;
},
};
return OpenTypeFileBuilder;
})();
// Problematic Unicode characters in the fonts that needs to be moved to avoid
// issues when they are painted on the canvas, e.g. complex-script shaping or
// control/whitespace characters. The ranges are listed in pairs: the first item
// is a code of the first problematic code, the second one is the next
// non-problematic code. The ranges must be in sorted order.
var ProblematicCharRanges = new Int32Array([
// Control characters.
0x0000, 0x0020,
0x007F, 0x00A1,
0x00AD, 0x00AE,
// Chars that is used in complex-script shaping.
0x0600, 0x0780,
0x08A0, 0x10A0,
0x1780, 0x1800,
0x1C00, 0x1C50,
// General punctuation chars.
0x2000, 0x2010,
0x2011, 0x2012,
0x2028, 0x2030,
0x205F, 0x2070,
0x25CC, 0x25CD,
0x3000, 0x3001,
0x3164, 0x3165,
// Chars that is used in complex-script shaping.
0xAA60, 0xAA80,
// Unicode high surrogates.
0xD800, 0xE000,
// Specials Unicode block.
0xFFF0, 0x10000
]);
/**
* 'Font' is the class the outside world should use, it encapsulate all the font
* decoding logics whatever type it is (assuming the font type is supported).
*
* For example to read a Type1 font and to attach it to the document:
* var type1Font = new Font("MyFontName", binaryFile, propertiesObject);
* type1Font.bind();
*/
var Font = (function FontClosure() {
function Font(name, file, properties) {
var charCode;
this.name = name;
this.loadedName = properties.loadedName;
this.isType3Font = properties.isType3Font;
this.sizes = [];
this.missingFile = false;
this.glyphCache = Object.create(null);
this.isSerifFont = !!(properties.flags & FontFlags.Serif);
this.isSymbolicFont = !!(properties.flags & FontFlags.Symbolic);
this.isMonospace = !!(properties.flags & FontFlags.FixedPitch);
var type = properties.type;
var subtype = properties.subtype;
this.type = type;
this.subtype = subtype;
this.fallbackName = (this.isMonospace ? 'monospace' :
(this.isSerifFont ? 'serif' : 'sans-serif'));
this.differences = properties.differences;
this.widths = properties.widths;
this.defaultWidth = properties.defaultWidth;
this.composite = properties.composite;
this.wideChars = properties.wideChars;
this.cMap = properties.cMap;
this.ascent = properties.ascent / PDF_GLYPH_SPACE_UNITS;
this.descent = properties.descent / PDF_GLYPH_SPACE_UNITS;
this.fontMatrix = properties.fontMatrix;
this.bbox = properties.bbox;
this.defaultEncoding = properties.defaultEncoding;
this.toUnicode = properties.toUnicode;
this.fallbackToUnicode = properties.fallbackToUnicode || new ToUnicodeMap();
this.toFontChar = [];
if (properties.type === 'Type3') {
for (charCode = 0; charCode < 256; charCode++) {
this.toFontChar[charCode] = (this.differences[charCode] ||
properties.defaultEncoding[charCode]);
}
this.fontType = FontType.TYPE3;
return;
}
this.cidEncoding = properties.cidEncoding;
this.vertical = properties.vertical;
if (this.vertical) {
this.vmetrics = properties.vmetrics;
this.defaultVMetrics = properties.defaultVMetrics;
}
if (!file || file.isEmpty) {
if (file) {
// Some bad PDF generators will include empty font files,
// attempting to recover by assuming that no file exists.
warn('Font file is empty in "' + name + '" (' + this.loadedName + ')');
}
this.fallbackToSystemFont();
return;
}
// Parse the font file to determine the correct type/subtype, rather than
// relying on the (often incorrect) data in the font dictionary; (see e.g.
// issue6782.pdf, issue7598.pdf, and issue9949.pdf).
[type, subtype] = getFontFileType(file, properties);
if (type !== this.type || subtype !== this.subtype) {
info('Inconsistent font file Type/SubType, expected: ' +
`${this.type}/${this.subtype} but found: ${type}/${subtype}.`);
}
try {
var data;
switch (type) {
case 'MMType1':
info('MMType1 font (' + name + '), falling back to Type1.');
/* falls through */
case 'Type1':
case 'CIDFontType0':
this.mimetype = 'font/opentype';
var cff = (subtype === 'Type1C' || subtype === 'CIDFontType0C') ?
new CFFFont(file, properties) :
new Type1Font(name, file, properties);
adjustWidths(properties);
// Wrap the CFF data inside an OTF font file
data = this.convert(name, cff, properties);
break;
case 'OpenType':
case 'TrueType':
case 'CIDFontType2':
this.mimetype = 'font/opentype';
// Repair the TrueType file. It is can be damaged in the point of
// view of the sanitizer
data = this.checkAndRepair(name, file, properties);
if (this.isOpenType) {
adjustWidths(properties);
type = 'OpenType';
}
break;
default:
throw new FormatError(`Font ${type} is not supported`);
}
} catch (e) {
warn(e);
this.fallbackToSystemFont();
return;
}
this.data = data;
this.fontType = getFontType(type, subtype);
// Transfer some properties again that could change during font conversion
this.fontMatrix = properties.fontMatrix;
this.widths = properties.widths;
this.defaultWidth = properties.defaultWidth;
this.toUnicode = properties.toUnicode;
this.encoding = properties.baseEncoding;
this.seacMap = properties.seacMap;
this.loading = true;
}
Font.getFontID = (function () {
var ID = 1;
return function Font_getFontID() {
return String(ID++);
};
})();
function int16(b0, b1) {
return (b0 << 8) + b1;
}
function writeSignedInt16(bytes, index, value) {
bytes[index + 1] = value;
bytes[index] = value >>> 8;
}
function signedInt16(b0, b1) {
var value = (b0 << 8) + b1;
return value & (1 << 15) ? value - 0x10000 : value;
}
function int32(b0, b1, b2, b3) {
return (b0 << 24) + (b1 << 16) + (b2 << 8) + b3;
}
function string16(value) {
return String.fromCharCode((value >> 8) & 0xff, value & 0xff);
}
function safeString16(value) {
// clamp value to the 16-bit int range
value = (value > 0x7FFF ? 0x7FFF : (value < -0x8000 ? -0x8000 : value));
return String.fromCharCode((value >> 8) & 0xff, value & 0xff);
}
function isTrueTypeFile(file) {
var header = file.peekBytes(4);
return (readUint32(header, 0) === 0x00010000 ||
bytesToString(header) === 'true');
}
function isTrueTypeCollectionFile(file) {
let header = file.peekBytes(4);
return bytesToString(header) === 'ttcf';
}
function isOpenTypeFile(file) {
var header = file.peekBytes(4);
return bytesToString(header) === 'OTTO';
}
function isType1File(file) {
var header = file.peekBytes(2);
// All Type1 font programs must begin with the comment '%!' (0x25 + 0x21).
if (header[0] === 0x25 && header[1] === 0x21) {
return true;
}
// ... obviously some fonts violate that part of the specification,
// please refer to the comment in |Type1Font| below.
if (header[0] === 0x80 && header[1] === 0x01) { // pfb file header.
return true;
}
return false;
}
/**
* Compared to other font formats, the header in CFF files is not constant
* but contains version numbers. To reduce the possibility of misclassifying
* font files as CFF, it's recommended to check for other font formats first.
*/
function isCFFFile(file) {
const header = file.peekBytes(4);
if (/* major version, [1, 255] */ header[0] >= 1 &&
/* minor version, [0, 255]; header[1] */
/* header size, [0, 255]; header[2] */
/* offset(0) size, [1, 4] */ (header[3] >= 1 && header[3] <= 4)) {
return true;
}
return false;
}
function getFontFileType(file, { type, subtype, composite, }) {
let fileType, fileSubtype;
if (isTrueTypeFile(file) || isTrueTypeCollectionFile(file)) {
if (composite) {
fileType = 'CIDFontType2';
} else {
fileType = 'TrueType';
}
} else if (isOpenTypeFile(file)) {
if (composite) {
fileType = 'CIDFontType2';
} else {
fileType = 'OpenType';
}
} else if (isType1File(file)) {
if (composite) {
fileType = 'CIDFontType0';
} else if (type === 'MMType1') {
fileType = 'MMType1';
} else {
fileType = 'Type1';
}
} else if (isCFFFile(file)) {
if (composite) {
fileType = 'CIDFontType0';
fileSubtype = 'CIDFontType0C';
} else {
fileType = 'Type1';
fileSubtype = 'Type1C';
}
} else {
warn('getFontFileType: Unable to detect correct font file Type/Subtype.');
fileType = type;
fileSubtype = subtype;
}
return [fileType, fileSubtype];
}
function buildToFontChar(encoding, glyphsUnicodeMap, differences) {
var toFontChar = [], unicode;
for (var i = 0, ii = encoding.length; i < ii; i++) {
unicode = getUnicodeForGlyph(encoding[i], glyphsUnicodeMap);
if (unicode !== -1) {
toFontChar[i] = unicode;
}
}
for (var charCode in differences) {
unicode = getUnicodeForGlyph(differences[charCode], glyphsUnicodeMap);
if (unicode !== -1) {
toFontChar[+charCode] = unicode;
}
}
return toFontChar;
}
/**
* Helper function for `adjustMapping`.
* @return {boolean}
*/
function isProblematicUnicodeLocation(code) {
// Using binary search to find a range start.
var i = 0, j = ProblematicCharRanges.length - 1;
while (i < j) {
var c = (i + j + 1) >> 1;
if (code < ProblematicCharRanges[c]) {
j = c - 1;
} else {
i = c;
}
}
// Even index means code in problematic range.
return !(i & 1);
}
/**
* Rebuilds the char code to glyph ID map by trying to replace the char codes
* with their unicode value. It also moves char codes that are in known
* problematic locations.
* @return {Object} Two properties:
* 'toFontChar' - maps original char codes(the value that will be read
* from commands such as show text) to the char codes that will be used in the
* font that we build
* 'charCodeToGlyphId' - maps the new font char codes to glyph ids
*/
function adjustMapping(charCodeToGlyphId, properties, missingGlyphs) {
var toUnicode = properties.toUnicode;
var isSymbolic = !!(properties.flags & FontFlags.Symbolic);
var isIdentityUnicode =
properties.toUnicode instanceof IdentityToUnicodeMap;
var newMap = Object.create(null);
var toFontChar = [];
var usedFontCharCodes = [];
var nextAvailableFontCharCode = PRIVATE_USE_OFFSET_START;
for (var originalCharCode in charCodeToGlyphId) {
originalCharCode |= 0;
var glyphId = charCodeToGlyphId[originalCharCode];
// For missing glyphs don't create the mappings so the glyph isn't
// drawn.
if (missingGlyphs[glyphId]) {
continue;
}
var fontCharCode = originalCharCode;
// First try to map the value to a unicode position if a non identity map
// was created.
var hasUnicodeValue = false;
if (!isIdentityUnicode && toUnicode.has(originalCharCode)) {
hasUnicodeValue = true;
var unicode = toUnicode.get(fontCharCode);
// TODO: Try to map ligatures to the correct spot.
if (unicode.length === 1) {
fontCharCode = unicode.charCodeAt(0);
}
}
// Try to move control characters, special characters and already mapped
// characters to the private use area since they will not be drawn by
// canvas if left in their current position. Also, move characters if the
// font was symbolic and there is only an identity unicode map since the
// characters probably aren't in the correct position (fixes an issue
// with firefox and thuluthfont).
if ((usedFontCharCodes[fontCharCode] !== undefined ||
isProblematicUnicodeLocation(fontCharCode) ||
(isSymbolic && !hasUnicodeValue))) {
// Loop to try and find a free spot in the private use area.
do {
if (nextAvailableFontCharCode > PRIVATE_USE_OFFSET_END) {
warn('Ran out of space in font private use area.');
break;
}
fontCharCode = nextAvailableFontCharCode++;
if (SKIP_PRIVATE_USE_RANGE_F000_TO_F01F && fontCharCode === 0xF000) {
fontCharCode = 0xF020;
nextAvailableFontCharCode = fontCharCode + 1;
}
} while (usedFontCharCodes[fontCharCode] !== undefined);
}
newMap[fontCharCode] = glyphId;
toFontChar[originalCharCode] = fontCharCode;
usedFontCharCodes[fontCharCode] = true;
}
return {
toFontChar,
charCodeToGlyphId: newMap,
nextAvailableFontCharCode,
};
}
function getRanges(glyphs, numGlyphs) {
// Array.sort() sorts by characters, not numerically, so convert to an
// array of characters.
var codes = [];
for (var charCode in glyphs) {
// Remove an invalid glyph ID mappings to make OTS happy.
if (glyphs[charCode] >= numGlyphs) {
continue;
}
codes.push({ fontCharCode: charCode | 0, glyphId: glyphs[charCode], });
}
// Some fonts have zero glyphs and are used only for text selection, but
// there needs to be at least one to build a valid cmap table.
if (codes.length === 0) {
codes.push({ fontCharCode: 0, glyphId: 0, });
}
codes.sort(function fontGetRangesSort(a, b) {
return a.fontCharCode - b.fontCharCode;
});
// Split the sorted codes into ranges.
var ranges = [];
var length = codes.length;
for (var n = 0; n < length; ) { // eslint-disable-line space-in-parens
var start = codes[n].fontCharCode;
var codeIndices = [codes[n].glyphId];
++n;
var end = start;
while (n < length && end + 1 === codes[n].fontCharCode) {
codeIndices.push(codes[n].glyphId);
++end;
++n;
if (end === 0xFFFF) {
break;
}
}
ranges.push([start, end, codeIndices]);
}
return ranges;
}
function createCmapTable(glyphs, numGlyphs) {
var ranges = getRanges(glyphs, numGlyphs);
var numTables = ranges[ranges.length - 1][1] > 0xFFFF ? 2 : 1;
var cmap = '\x00\x00' + // version
string16(numTables) + // numTables
'\x00\x03' + // platformID
'\x00\x01' + // encodingID
string32(4 + numTables * 8); // start of the table record
var i, ii, j, jj;
for (i = ranges.length - 1; i >= 0; --i) {
if (ranges[i][0] <= 0xFFFF) {
break;
}
}
var bmpLength = i + 1;
if (ranges[i][0] < 0xFFFF && ranges[i][1] === 0xFFFF) {
ranges[i][1] = 0xFFFE;
}
var trailingRangesCount = ranges[i][1] < 0xFFFF ? 1 : 0;
var segCount = bmpLength + trailingRangesCount;
var searchParams = OpenTypeFileBuilder.getSearchParams(segCount, 2);
// Fill up the 4 parallel arrays describing the segments.
var startCount = '';
var endCount = '';
var idDeltas = '';
var idRangeOffsets = '';
var glyphsIds = '';
var bias = 0;
var range, start, end, codes;
for (i = 0, ii = bmpLength; i < ii; i++) {
range = ranges[i];
start = range[0];
end = range[1];
startCount += string16(start);
endCount += string16(end);
codes = range[2];
var contiguous = true;
for (j = 1, jj = codes.length; j < jj; ++j) {
if (codes[j] !== codes[j - 1] + 1) {
contiguous = false;
break;
}
}
if (!contiguous) {
var offset = (segCount - i) * 2 + bias * 2;
bias += (end - start + 1);
idDeltas += string16(0);
idRangeOffsets += string16(offset);
for (j = 0, jj = codes.length; j < jj; ++j) {
glyphsIds += string16(codes[j]);
}
} else {
var startCode = codes[0];
idDeltas += string16((startCode - start) & 0xFFFF);
idRangeOffsets += string16(0);
}
}
if (trailingRangesCount > 0) {
endCount += '\xFF\xFF';
startCount += '\xFF\xFF';
idDeltas += '\x00\x01';
idRangeOffsets += '\x00\x00';
}
var format314 = '\x00\x00' + // language
string16(2 * segCount) +
string16(searchParams.range) +
string16(searchParams.entry) +
string16(searchParams.rangeShift) +
endCount + '\x00\x00' + startCount +
idDeltas + idRangeOffsets + glyphsIds;
var format31012 = '';
var header31012 = '';
if (numTables > 1) {
cmap += '\x00\x03' + // platformID
'\x00\x0A' + // encodingID
string32(4 + numTables * 8 +
4 + format314.length); // start of the table record
format31012 = '';
for (i = 0, ii = ranges.length; i < ii; i++) {
range = ranges[i];
start = range[0];
codes = range[2];
var code = codes[0];
for (j = 1, jj = codes.length; j < jj; ++j) {
if (codes[j] !== codes[j - 1] + 1) {
end = range[0] + j - 1;
format31012 += string32(start) + // startCharCode
string32(end) + // endCharCode
string32(code); // startGlyphID
start = end + 1;
code = codes[j];
}
}
format31012 += string32(start) + // startCharCode
string32(range[1]) + // endCharCode
string32(code); // startGlyphID
}
header31012 = '\x00\x0C' + // format
'\x00\x00' + // reserved
string32(format31012.length + 16) + // length
'\x00\x00\x00\x00' + // language
string32(format31012.length / 12); // nGroups
}
return cmap + '\x00\x04' + // format
string16(format314.length + 4) + // length
format314 + header31012 + format31012;
}
function validateOS2Table(os2) {
var stream = new Stream(os2.data);
var version = stream.getUint16();
// TODO verify all OS/2 tables fields, but currently we validate only those
// that give us issues
stream.getBytes(60); // skipping type, misc sizes, panose, unicode ranges
var selection = stream.getUint16();
if (version < 4 && (selection & 0x0300)) {
return false;
}
var firstChar = stream.getUint16();
var lastChar = stream.getUint16();
if (firstChar > lastChar) {
return false;
}
stream.getBytes(6); // skipping sTypoAscender/Descender/LineGap
var usWinAscent = stream.getUint16();
if (usWinAscent === 0) { // makes font unreadable by windows
return false;
}
// OS/2 appears to be valid, resetting some fields
os2.data[8] = os2.data[9] = 0; // IE rejects fonts if fsType != 0
return true;
}
function createOS2Table(properties, charstrings, override) {
override = override || {
unitsPerEm: 0,
yMax: 0,
yMin: 0,
ascent: 0,
descent: 0,
};
var ulUnicodeRange1 = 0;
var ulUnicodeRange2 = 0;
var ulUnicodeRange3 = 0;
var ulUnicodeRange4 = 0;
var firstCharIndex = null;
var lastCharIndex = 0;
if (charstrings) {
for (var code in charstrings) {
code |= 0;
if (firstCharIndex > code || !firstCharIndex) {
firstCharIndex = code;
}
if (lastCharIndex < code) {
lastCharIndex = code;
}
var position = getUnicodeRangeFor(code);
if (position < 32) {
ulUnicodeRange1 |= 1 << position;
} else if (position < 64) {
ulUnicodeRange2 |= 1 << position - 32;
} else if (position < 96) {
ulUnicodeRange3 |= 1 << position - 64;
} else if (position < 123) {
ulUnicodeRange4 |= 1 << position - 96;
} else {
throw new FormatError(
'Unicode ranges Bits > 123 are reserved for internal usage');
}
}
} else {
// TODO
firstCharIndex = 0;
lastCharIndex = 255;
}
var bbox = properties.bbox || [0, 0, 0, 0];
var unitsPerEm = (override.unitsPerEm ||
1 / (properties.fontMatrix || FONT_IDENTITY_MATRIX)[0]);
// if the font units differ to the PDF glyph space units
// then scale up the values
var scale = (properties.ascentScaled ? 1.0 :
unitsPerEm / PDF_GLYPH_SPACE_UNITS);
var typoAscent = (override.ascent ||
Math.round(scale * (properties.ascent || bbox[3])));
var typoDescent = (override.descent ||
Math.round(scale * (properties.descent || bbox[1])));
if (typoDescent > 0 && properties.descent > 0 && bbox[1] < 0) {
typoDescent = -typoDescent; // fixing incorrect descent
}
var winAscent = override.yMax || typoAscent;
var winDescent = -override.yMin || -typoDescent;
return '\x00\x03' + // version
'\x02\x24' + // xAvgCharWidth
'\x01\xF4' + // usWeightClass
'\x00\x05' + // usWidthClass
'\x00\x00' + // fstype (0 to let the font loads via font-face on IE)
'\x02\x8A' + // ySubscriptXSize
'\x02\xBB' + // ySubscriptYSize
'\x00\x00' + // ySubscriptXOffset
'\x00\x8C' + // ySubscriptYOffset
'\x02\x8A' + // ySuperScriptXSize
'\x02\xBB' + // ySuperScriptYSize
'\x00\x00' + // ySuperScriptXOffset
'\x01\xDF' + // ySuperScriptYOffset
'\x00\x31' + // yStrikeOutSize
'\x01\x02' + // yStrikeOutPosition
'\x00\x00' + // sFamilyClass
'\x00\x00\x06' +
String.fromCharCode(properties.fixedPitch ? 0x09 : 0x00) +
'\x00\x00\x00\x00\x00\x00' + // Panose
string32(ulUnicodeRange1) + // ulUnicodeRange1 (Bits 0-31)
string32(ulUnicodeRange2) + // ulUnicodeRange2 (Bits 32-63)
string32(ulUnicodeRange3) + // ulUnicodeRange3 (Bits 64-95)
string32(ulUnicodeRange4) + // ulUnicodeRange4 (Bits 96-127)
'\x2A\x32\x31\x2A' + // achVendID
string16(properties.italicAngle ? 1 : 0) + // fsSelection
string16(firstCharIndex ||
properties.firstChar) + // usFirstCharIndex
string16(lastCharIndex || properties.lastChar) + // usLastCharIndex
string16(typoAscent) + // sTypoAscender
string16(typoDescent) + // sTypoDescender
'\x00\x64' + // sTypoLineGap (7%-10% of the unitsPerEM value)
string16(winAscent) + // usWinAscent
string16(winDescent) + // usWinDescent
'\x00\x00\x00\x00' + // ulCodePageRange1 (Bits 0-31)
'\x00\x00\x00\x00' + // ulCodePageRange2 (Bits 32-63)
string16(properties.xHeight) + // sxHeight
string16(properties.capHeight) + // sCapHeight
string16(0) + // usDefaultChar
string16(firstCharIndex || properties.firstChar) + // usBreakChar
'\x00\x03'; // usMaxContext
}
function createPostTable(properties) {
var angle = Math.floor(properties.italicAngle * (Math.pow(2, 16)));
return ('\x00\x03\x00\x00' + // Version number
string32(angle) + // italicAngle
'\x00\x00' + // underlinePosition
'\x00\x00' + // underlineThickness
string32(properties.fixedPitch) + // isFixedPitch
'\x00\x00\x00\x00' + // minMemType42
'\x00\x00\x00\x00' + // maxMemType42
'\x00\x00\x00\x00' + // minMemType1
'\x00\x00\x00\x00'); // maxMemType1
}
function createNameTable(name, proto) {
if (!proto) {
proto = [[], []]; // no strings and unicode strings
}
var strings = [
proto[0][0] || 'Original licence', // 0.Copyright
proto[0][1] || name, // 1.Font family
proto[0][2] || 'Unknown', // 2.Font subfamily (font weight)
proto[0][3] || 'uniqueID', // 3.Unique ID
proto[0][4] || name, // 4.Full font name
proto[0][5] || 'Version 0.11', // 5.Version
proto[0][6] || '', // 6.Postscript name
proto[0][7] || 'Unknown', // 7.Trademark
proto[0][8] || 'Unknown', // 8.Manufacturer
proto[0][9] || 'Unknown' // 9.Designer
];
// Mac want 1-byte per character strings while Windows want
// 2-bytes per character, so duplicate the names table
var stringsUnicode = [];
var i, ii, j, jj, str;
for (i = 0, ii = strings.length; i < ii; i++) {
str = proto[1][i] || strings[i];
var strBufUnicode = [];
for (j = 0, jj = str.length; j < jj; j++) {
strBufUnicode.push(string16(str.charCodeAt(j)));
}
stringsUnicode.push(strBufUnicode.join(''));
}
var names = [strings, stringsUnicode];
var platforms = ['\x00\x01', '\x00\x03'];
var encodings = ['\x00\x00', '\x00\x01'];
var languages = ['\x00\x00', '\x04\x09'];
var namesRecordCount = strings.length * platforms.length;
var nameTable =
'\x00\x00' + // format
string16(namesRecordCount) + // Number of names Record
string16(namesRecordCount * 12 + 6); // Storage
// Build the name records field
var strOffset = 0;
for (i = 0, ii = platforms.length; i < ii; i++) {
var strs = names[i];
for (j = 0, jj = strs.length; j < jj; j++) {
str = strs[j];
var nameRecord =
platforms[i] + // platform ID
encodings[i] + // encoding ID
languages[i] + // language ID
string16(j) + // name ID
string16(str.length) +
string16(strOffset);
nameTable += nameRecord;
strOffset += str.length;
}
}
nameTable += strings.join('') + stringsUnicode.join('');
return nameTable;
}
Font.prototype = {
name: null,
font: null,
mimetype: null,
encoding: null,
get renderer() {
var renderer = FontRendererFactory.create(this, SEAC_ANALYSIS_ENABLED);
return shadow(this, 'renderer', renderer);
},
exportData: function Font_exportData() {
// TODO remove enumerating of the properties, e.g. hardcode exact names.
var data = {};
for (var i in this) {
if (this.hasOwnProperty(i)) {
data[i] = this[i];
}
}
return data;
},
fallbackToSystemFont: function Font_fallbackToSystemFont() {
this.missingFile = true;
var charCode, unicode;
// The file data is not specified. Trying to fix the font name
// to be used with the canvas.font.
var name = this.name;
var type = this.type;
var subtype = this.subtype;
var fontName = name.replace(/[,_]/g, '-');
var stdFontMap = getStdFontMap(), nonStdFontMap = getNonStdFontMap();
var isStandardFont = !!stdFontMap[fontName] ||
!!(nonStdFontMap[fontName] && stdFontMap[nonStdFontMap[fontName]]);
fontName = stdFontMap[fontName] || nonStdFontMap[fontName] || fontName;
this.bold = (fontName.search(/bold/gi) !== -1);
this.italic = ((fontName.search(/oblique/gi) !== -1) ||
(fontName.search(/italic/gi) !== -1));
// Use 'name' instead of 'fontName' here because the original
// name ArialBlack for example will be replaced by Helvetica.
this.black = (name.search(/Black/g) !== -1);
// if at least one width is present, remeasure all chars when exists
this.remeasure = Object.keys(this.widths).length > 0;
if (isStandardFont && type === 'CIDFontType2' &&
this.cidEncoding.indexOf('Identity-') === 0) {
var GlyphMapForStandardFonts = getGlyphMapForStandardFonts();
// Standard fonts might be embedded as CID font without glyph mapping.
// Building one based on GlyphMapForStandardFonts.
var map = [];
for (charCode in GlyphMapForStandardFonts) {
map[+charCode] = GlyphMapForStandardFonts[charCode];
}
if (/Arial-?Black/i.test(name)) {
var SupplementalGlyphMapForArialBlack =
getSupplementalGlyphMapForArialBlack();
for (charCode in SupplementalGlyphMapForArialBlack) {
map[+charCode] = SupplementalGlyphMapForArialBlack[charCode];
}
} else if (/Calibri/i.test(name)) {
let SupplementalGlyphMapForCalibri =
getSupplementalGlyphMapForCalibri();
for (charCode in SupplementalGlyphMapForCalibri) {
map[+charCode] = SupplementalGlyphMapForCalibri[charCode];
}
}
var isIdentityUnicode = this.toUnicode instanceof IdentityToUnicodeMap;
if (!isIdentityUnicode) {
this.toUnicode.forEach(function(charCode, unicodeCharCode) {
map[+charCode] = unicodeCharCode;
});
}
this.toFontChar = map;
this.toUnicode = new ToUnicodeMap(map);
} else if (/Symbol/i.test(fontName)) {
this.toFontChar = buildToFontChar(SymbolSetEncoding, getGlyphsUnicode(),
this.differences);
} else if (/Dingbats/i.test(fontName)) {
if (/Wingdings/i.test(name)) {
warn('Non-embedded Wingdings font, falling back to ZapfDingbats.');
}
this.toFontChar = buildToFontChar(ZapfDingbatsEncoding,
getDingbatsGlyphsUnicode(),
this.differences);
} else if (isStandardFont) {
this.toFontChar = buildToFontChar(this.defaultEncoding,
getGlyphsUnicode(),
this.differences);
} else {
var glyphsUnicodeMap = getGlyphsUnicode();
this.toUnicode.forEach((charCode, unicodeCharCode) => {
if (!this.composite) {
var glyphName = (this.differences[charCode] ||
this.defaultEncoding[charCode]);
unicode = getUnicodeForGlyph(glyphName, glyphsUnicodeMap);
if (unicode !== -1) {
unicodeCharCode = unicode;
}
}
this.toFontChar[charCode] = unicodeCharCode;
});
}
this.loadedName = fontName.split('-')[0];
this.loading = false;
this.fontType = getFontType(type, subtype);
},
checkAndRepair: function Font_checkAndRepair(name, font, properties) {
const VALID_TABLES = ['OS/2', 'cmap', 'head', 'hhea', 'hmtx', 'maxp',
'name', 'post', 'loca', 'glyf', 'fpgm', 'prep', 'cvt ', 'CFF '];
function readTables(file, numTables) {
let tables = Object.create(null);
tables['OS/2'] = null;
tables['cmap'] = null;
tables['head'] = null;
tables['hhea'] = null;
tables['hmtx'] = null;
tables['maxp'] = null;
tables['name'] = null;
tables['post'] = null;
for (let i = 0; i < numTables; i++) {
let table = readTableEntry(font);
if (!VALID_TABLES.includes(table.tag)) {
continue; // skipping table if it's not a required or optional table
}
if (table.length === 0) {
continue; // skipping empty tables
}
tables[table.tag] = table;
}
return tables;
}
function readTableEntry(file) {
var tag = bytesToString(file.getBytes(4));
var checksum = file.getInt32() >>> 0;
var offset = file.getInt32() >>> 0;
var length = file.getInt32() >>> 0;
// Read the table associated data
var previousPosition = file.pos;
file.pos = file.start ? file.start : 0;
file.skip(offset);
var data = file.getBytes(length);
file.pos = previousPosition;
if (tag === 'head') {
// clearing checksum adjustment
data[8] = data[9] = data[10] = data[11] = 0;
data[17] |= 0x20; // Set font optimized for cleartype flag.
}
return {
tag,
checksum,
length,
offset,
data,
};
}
function readOpenTypeHeader(ttf) {
return {
version: bytesToString(ttf.getBytes(4)),
numTables: ttf.getUint16(),
searchRange: ttf.getUint16(),
entrySelector: ttf.getUint16(),
rangeShift: ttf.getUint16(),
};
}
function readTrueTypeCollectionHeader(ttc) {
let ttcTag = bytesToString(ttc.getBytes(4));
assert(ttcTag === 'ttcf', 'Must be a TrueType Collection font.');
let majorVersion = ttc.getUint16();
let minorVersion = ttc.getUint16();
let numFonts = ttc.getInt32() >>> 0;
let offsetTable = [];
for (let i = 0; i < numFonts; i++) {
offsetTable.push(ttc.getInt32() >>> 0);
}
let header = {
ttcTag,
majorVersion,
minorVersion,
numFonts,
offsetTable,
};
switch (majorVersion) {
case 1:
return header;
case 2:
header.dsigTag = ttc.getInt32() >>> 0;
header.dsigLength = ttc.getInt32() >>> 0;
header.dsigOffset = ttc.getInt32() >>> 0;
return header;
}
throw new FormatError(
`Invalid TrueType Collection majorVersion: ${majorVersion}.`);
}
function readTrueTypeCollectionData(ttc, fontName) {
let { numFonts, offsetTable, } = readTrueTypeCollectionHeader(ttc);
for (let i = 0; i < numFonts; i++) {
ttc.pos = (ttc.start || 0) + offsetTable[i];
let potentialHeader = readOpenTypeHeader(ttc);
let potentialTables = readTables(ttc, potentialHeader.numTables);
if (!potentialTables['name']) {
throw new FormatError(
'TrueType Collection font must contain a "name" table.');
}
let nameTable = readNameTable(potentialTables['name']);
for (let j = 0, jj = nameTable.length; j < jj; j++) {
for (let k = 0, kk = nameTable[j].length; k < kk; k++) {
let nameEntry = nameTable[j][k];
if (nameEntry && nameEntry.replace(/\s/g, '') === fontName) {
return {
header: potentialHeader,
tables: potentialTables,
};
}
}
}
}
throw new FormatError(
`TrueType Collection does not contain "${fontName}" font.`);
}
/**
* Read the appropriate subtable from the cmap according to 9.6.6.4 from
* PDF spec
*/
function readCmapTable(cmap, font, isSymbolicFont, hasEncoding) {
if (!cmap) {
warn('No cmap table available.');
return {
platformId: -1,
encodingId: -1,
mappings: [],
hasShortCmap: false,
};
}
var segment;
var start = (font.start ? font.start : 0) + cmap.offset;
font.pos = start;
font.getUint16(); // version
var numTables = font.getUint16();
var potentialTable;
var canBreak = false;
// There's an order of preference in terms of which cmap subtable to
// use:
// - non-symbolic fonts the preference is a 3,1 table then a 1,0 table
// - symbolic fonts the preference is a 3,0 table then a 1,0 table
// The following takes advantage of the fact that the tables are sorted
// to work.
for (var i = 0; i < numTables; i++) {
var platformId = font.getUint16();
var encodingId = font.getUint16();
var offset = font.getInt32() >>> 0;
var useTable = false;
// Sometimes there are multiple of the same type of table. Default
// to choosing the first table and skip the rest.
if (potentialTable && potentialTable.platformId === platformId &&
potentialTable.encodingId === encodingId) {
continue;
}
if (platformId === 0 && encodingId === 0) {
useTable = true;
// Continue the loop since there still may be a higher priority
// table.
} else if (platformId === 1 && encodingId === 0) {
useTable = true;
// Continue the loop since there still may be a higher priority
// table.
} else if (platformId === 3 && encodingId === 1 &&
(hasEncoding || !potentialTable)) {
useTable = true;
if (!isSymbolicFont) {
canBreak = true;
}
} else if (isSymbolicFont && platformId === 3 && encodingId === 0) {
useTable = true;
canBreak = true;
}
if (useTable) {
potentialTable = {
platformId,
encodingId,
offset,
};
}
if (canBreak) {
break;
}
}
if (potentialTable) {
font.pos = start + potentialTable.offset;
}
if (!potentialTable || font.peekByte() === -1) {
warn('Could not find a preferred cmap table.');
return {
platformId: -1,
encodingId: -1,
mappings: [],
hasShortCmap: false,
};
}
var format = font.getUint16();
font.getUint16(); // length
font.getUint16(); // language
var hasShortCmap = false;
var mappings = [];
var j, glyphId;
// TODO(mack): refactor this cmap subtable reading logic out
if (format === 0) {
for (j = 0; j < 256; j++) {
var index = font.getByte();
if (!index) {
continue;
}
mappings.push({
charCode: j,
glyphId: index,
});
}
hasShortCmap = true;
} else if (format === 4) {
// re-creating the table in format 4 since the encoding
// might be changed
var segCount = (font.getUint16() >> 1);
font.getBytes(6); // skipping range fields
var segIndex, segments = [];
for (segIndex = 0; segIndex < segCount; segIndex++) {
segments.push({ end: font.getUint16(), });
}
font.getUint16();
for (segIndex = 0; segIndex < segCount; segIndex++) {
segments[segIndex].start = font.getUint16();
}
for (segIndex = 0; segIndex < segCount; segIndex++) {
segments[segIndex].delta = font.getUint16();
}
var offsetsCount = 0;
for (segIndex = 0; segIndex < segCount; segIndex++) {
segment = segments[segIndex];
var rangeOffset = font.getUint16();
if (!rangeOffset) {
segment.offsetIndex = -1;
continue;
}
var offsetIndex = (rangeOffset >> 1) - (segCount - segIndex);
segment.offsetIndex = offsetIndex;
offsetsCount = Math.max(offsetsCount, offsetIndex +
segment.end - segment.start + 1);
}
var offsets = [];
for (j = 0; j < offsetsCount; j++) {
offsets.push(font.getUint16());
}
for (segIndex = 0; segIndex < segCount; segIndex++) {
segment = segments[segIndex];
start = segment.start;
var end = segment.end;
var delta = segment.delta;
offsetIndex = segment.offsetIndex;
for (j = start; j <= end; j++) {
if (j === 0xFFFF) {
continue;
}
glyphId = (offsetIndex < 0 ?
j : offsets[offsetIndex + j - start]);
glyphId = (glyphId + delta) & 0xFFFF;
mappings.push({
charCode: j,
glyphId,
});
}
}
} else if (format === 6) {
// Format 6 is a 2-bytes dense mapping, which means the font data
// lives glue together even if they are pretty far in the unicode
// table. (This looks weird, so I can have missed something), this
// works on Linux but seems to fails on Mac so let's rewrite the
// cmap table to a 3-1-4 style
var firstCode = font.getUint16();
var entryCount = font.getUint16();
for (j = 0; j < entryCount; j++) {
glyphId = font.getUint16();
var charCode = firstCode + j;
mappings.push({
charCode,
glyphId,
});
}
} else {
warn('cmap table has unsupported format: ' + format);
return {
platformId: -1,
encodingId: -1,
mappings: [],
hasShortCmap: false,
};
}
// removing duplicate entries
mappings.sort(function (a, b) {
return a.charCode - b.charCode;
});
for (i = 1; i < mappings.length; i++) {
if (mappings[i - 1].charCode === mappings[i].charCode) {
mappings.splice(i, 1);
i--;
}
}
return {
platformId: potentialTable.platformId,
encodingId: potentialTable.encodingId,
mappings,
hasShortCmap,
};
}
function sanitizeMetrics(font, header, metrics, numGlyphs) {
if (!header) {
if (metrics) {
metrics.data = null;
}
return;
}
font.pos = (font.start ? font.start : 0) + header.offset;
font.pos += header.length - 2;
var numOfMetrics = font.getUint16();
if (numOfMetrics > numGlyphs) {
info('The numOfMetrics (' + numOfMetrics + ') should not be ' +
'greater than the numGlyphs (' + numGlyphs + ')');
// Reduce numOfMetrics if it is greater than numGlyphs
numOfMetrics = numGlyphs;
header.data[34] = (numOfMetrics & 0xff00) >> 8;
header.data[35] = numOfMetrics & 0x00ff;
}
var numOfSidebearings = numGlyphs - numOfMetrics;
var numMissing = numOfSidebearings -
((metrics.length - numOfMetrics * 4) >> 1);
if (numMissing > 0) {
// For each missing glyph, we set both the width and lsb to 0 (zero).
// Since we need to add two properties for each glyph, this explains
// the use of |numMissing * 2| when initializing the typed array.
var entries = new Uint8Array(metrics.length + numMissing * 2);
entries.set(metrics.data);
metrics.data = entries;
}
}
function sanitizeGlyph(source, sourceStart, sourceEnd, dest, destStart,
hintsValid) {
var glyphProfile = {
length: 0,
sizeOfInstructions: 0,
};
if (sourceEnd - sourceStart <= 12) {
// glyph with data less than 12 is invalid one
return glyphProfile;
}
var glyf = source.subarray(sourceStart, sourceEnd);
var contoursCount = signedInt16(glyf[0], glyf[1]);
if (contoursCount < 0) {
// OTS doesn't like contour count to be less than -1.
contoursCount = -1;
writeSignedInt16(glyf, 0, contoursCount);
// complex glyph, writing as is
dest.set(glyf, destStart);
glyphProfile.length = glyf.length;
return glyphProfile;
}
var i, j = 10, flagsCount = 0;
for (i = 0; i < contoursCount; i++) {
var endPoint = (glyf[j] << 8) | glyf[j + 1];
flagsCount = endPoint + 1;
j += 2;
}
// skipping instructions
var instructionsStart = j;
var instructionsLength = (glyf[j] << 8) | glyf[j + 1];
glyphProfile.sizeOfInstructions = instructionsLength;
j += 2 + instructionsLength;
var instructionsEnd = j;
// validating flags
var coordinatesLength = 0;
for (i = 0; i < flagsCount; i++) {
var flag = glyf[j++];
if (flag & 0xC0) {
// reserved flags must be zero, cleaning up
glyf[j - 1] = flag & 0x3F;
}
var xyLength = ((flag & 2) ? 1 : (flag & 16) ? 0 : 2) +
((flag & 4) ? 1 : (flag & 32) ? 0 : 2);
coordinatesLength += xyLength;
if (flag & 8) {
var repeat = glyf[j++];
i += repeat;
coordinatesLength += repeat * xyLength;
}
}
// glyph without coordinates will be rejected
if (coordinatesLength === 0) {
return glyphProfile;
}
var glyphDataLength = j + coordinatesLength;
if (glyphDataLength > glyf.length) {
// not enough data for coordinates
return glyphProfile;
}
if (!hintsValid && instructionsLength > 0) {
dest.set(glyf.subarray(0, instructionsStart), destStart);
dest.set([0, 0], destStart + instructionsStart);
dest.set(glyf.subarray(instructionsEnd, glyphDataLength),
destStart + instructionsStart + 2);
glyphDataLength -= instructionsLength;
if (glyf.length - glyphDataLength > 3) {
glyphDataLength = (glyphDataLength + 3) & ~3;
}
glyphProfile.length = glyphDataLength;
return glyphProfile;
}
if (glyf.length - glyphDataLength > 3) {
// truncating and aligning to 4 bytes the long glyph data
glyphDataLength = (glyphDataLength + 3) & ~3;
dest.set(glyf.subarray(0, glyphDataLength), destStart);
glyphProfile.length = glyphDataLength;
return glyphProfile;
}
// glyph data is fine
dest.set(glyf, destStart);
glyphProfile.length = glyf.length;
return glyphProfile;
}
function sanitizeHead(head, numGlyphs, locaLength) {
var data = head.data;
// Validate version:
// Should always be 0x00010000
var version = int32(data[0], data[1], data[2], data[3]);
if (version >> 16 !== 1) {
info('Attempting to fix invalid version in head table: ' + version);
data[0] = 0;
data[1] = 1;
data[2] = 0;
data[3] = 0;
}
var indexToLocFormat = int16(data[50], data[51]);
if (indexToLocFormat < 0 || indexToLocFormat > 1) {
info('Attempting to fix invalid indexToLocFormat in head table: ' +
indexToLocFormat);
// The value of indexToLocFormat should be 0 if the loca table
// consists of short offsets, and should be 1 if the loca table
// consists of long offsets.
//
// The number of entries in the loca table should be numGlyphs + 1.
//
// Using this information, we can work backwards to deduce if the
// size of each offset in the loca table, and thus figure out the
// appropriate value for indexToLocFormat.
var numGlyphsPlusOne = numGlyphs + 1;
if (locaLength === numGlyphsPlusOne << 1) {
// 0x0000 indicates the loca table consists of short offsets
data[50] = 0;
data[51] = 0;
} else if (locaLength === numGlyphsPlusOne << 2) {
// 0x0001 indicates the loca table consists of long offsets
data[50] = 0;
data[51] = 1;
} else {
throw new FormatError('Could not fix indexToLocFormat: ' +
indexToLocFormat);
}
}
}
function sanitizeGlyphLocations(loca, glyf, numGlyphs,
isGlyphLocationsLong, hintsValid,
dupFirstEntry, maxSizeOfInstructions) {
var itemSize, itemDecode, itemEncode;
if (isGlyphLocationsLong) {
itemSize = 4;
itemDecode = function fontItemDecodeLong(data, offset) {
return (data[offset] << 24) | (data[offset + 1] << 16) |
(data[offset + 2] << 8) | data[offset + 3];
};
itemEncode = function fontItemEncodeLong(data, offset, value) {
data[offset] = (value >>> 24) & 0xFF;
data[offset + 1] = (value >> 16) & 0xFF;
data[offset + 2] = (value >> 8) & 0xFF;
data[offset + 3] = value & 0xFF;
};
} else {
itemSize = 2;
itemDecode = function fontItemDecode(data, offset) {
return (data[offset] << 9) | (data[offset + 1] << 1);
};
itemEncode = function fontItemEncode(data, offset, value) {
data[offset] = (value >> 9) & 0xFF;
data[offset + 1] = (value >> 1) & 0xFF;
};
}
var locaData = loca.data;
var locaDataSize = itemSize * (1 + numGlyphs);
// is loca.data too short or long?
if (locaData.length !== locaDataSize) {
locaData = new Uint8Array(locaDataSize);
locaData.set(loca.data.subarray(0, locaDataSize));
loca.data = locaData;
}
// removing the invalid glyphs
var oldGlyfData = glyf.data;
var oldGlyfDataLength = oldGlyfData.length;
var newGlyfData = new Uint8Array(oldGlyfDataLength);
var startOffset = itemDecode(locaData, 0);
var writeOffset = 0;
var missingGlyphs = Object.create(null);
itemEncode(locaData, 0, writeOffset);
var i, j;
// When called with dupFirstEntry the number of glyphs has already been
// increased but there isn't data yet for the duplicated glyph.
var locaCount = dupFirstEntry ? numGlyphs - 1 : numGlyphs;
for (i = 0, j = itemSize; i < locaCount; i++, j += itemSize) {
var endOffset = itemDecode(locaData, j);
// The spec says the offsets should be in ascending order, however
// some fonts use the offset of 0 to mark a glyph as missing.
if (endOffset === 0) {
endOffset = startOffset;
}
if (endOffset > oldGlyfDataLength &&
((oldGlyfDataLength + 3) & ~3) === endOffset) {
// Aspose breaks fonts by aligning the glyphs to the qword, but not
// the glyf table size, which makes last glyph out of range.
endOffset = oldGlyfDataLength;
}
if (endOffset > oldGlyfDataLength) {
// glyph end offset points outside glyf data, rejecting the glyph
startOffset = endOffset;
}
var glyphProfile = sanitizeGlyph(oldGlyfData, startOffset, endOffset,
newGlyfData, writeOffset,
hintsValid);
var newLength = glyphProfile.length;
if (newLength === 0) {
missingGlyphs[i] = true;
}
if (glyphProfile.sizeOfInstructions > maxSizeOfInstructions) {
maxSizeOfInstructions = glyphProfile.sizeOfInstructions;
}
writeOffset += newLength;
itemEncode(locaData, j, writeOffset);
startOffset = endOffset;
}
if (writeOffset === 0) {
// glyf table cannot be empty -- redoing the glyf and loca tables
// to have single glyph with one point
var simpleGlyph = new Uint8Array(
[0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 49, 0]);
for (i = 0, j = itemSize; i < numGlyphs; i++, j += itemSize) {
itemEncode(locaData, j, simpleGlyph.length);
}
glyf.data = simpleGlyph;
} else if (dupFirstEntry) {
var firstEntryLength = itemDecode(locaData, itemSize);
if (newGlyfData.length > firstEntryLength + writeOffset) {
glyf.data = newGlyfData.subarray(0, firstEntryLength + writeOffset);
} else {
glyf.data = new Uint8Array(firstEntryLength + writeOffset);
glyf.data.set(newGlyfData.subarray(0, writeOffset));
}
glyf.data.set(newGlyfData.subarray(0, firstEntryLength), writeOffset);
itemEncode(loca.data, locaData.length - itemSize,
writeOffset + firstEntryLength);
} else {
glyf.data = newGlyfData.subarray(0, writeOffset);
}
return {
missingGlyphs,
maxSizeOfInstructions,
};
}
function readPostScriptTable(post, properties, maxpNumGlyphs) {
var start = (font.start ? font.start : 0) + post.offset;
font.pos = start;
var length = post.length, end = start + length;
var version = font.getInt32();
// skip rest to the tables
font.getBytes(28);
var glyphNames;
var valid = true;
var i;
switch (version) {
case 0x00010000:
glyphNames = MacStandardGlyphOrdering;
break;
case 0x00020000:
var numGlyphs = font.getUint16();
if (numGlyphs !== maxpNumGlyphs) {
valid = false;
break;
}
var glyphNameIndexes = [];
for (i = 0; i < numGlyphs; ++i) {
var index = font.getUint16();
if (index >= 32768) {
valid = false;
break;
}
glyphNameIndexes.push(index);
}
if (!valid) {
break;
}
var customNames = [];
var strBuf = [];
while (font.pos < end) {
var stringLength = font.getByte();
strBuf.length = stringLength;
for (i = 0; i < stringLength; ++i) {
strBuf[i] = String.fromCharCode(font.getByte());
}
customNames.push(strBuf.join(''));
}
glyphNames = [];
for (i = 0; i < numGlyphs; ++i) {
var j = glyphNameIndexes[i];
if (j < 258) {
glyphNames.push(MacStandardGlyphOrdering[j]);
continue;
}
glyphNames.push(customNames[j - 258]);
}
break;
case 0x00030000:
break;
default:
warn('Unknown/unsupported post table version ' + version);
valid = false;
if (properties.defaultEncoding) {
glyphNames = properties.defaultEncoding;
}
break;
}
properties.glyphNames = glyphNames;
return valid;
}
function readNameTable(nameTable) {
var start = (font.start ? font.start : 0) + nameTable.offset;
font.pos = start;
var names = [[], []];
var length = nameTable.length, end = start + length;
var format = font.getUint16();
var FORMAT_0_HEADER_LENGTH = 6;
if (format !== 0 || length < FORMAT_0_HEADER_LENGTH) {
// unsupported name table format or table "too" small
return names;
}
var numRecords = font.getUint16();
var stringsStart = font.getUint16();
var records = [];
var NAME_RECORD_LENGTH = 12;
var i, ii;
for (i = 0; i < numRecords &&
font.pos + NAME_RECORD_LENGTH <= end; i++) {
var r = {
platform: font.getUint16(),
encoding: font.getUint16(),
language: font.getUint16(),
name: font.getUint16(),
length: font.getUint16(),
offset: font.getUint16(),
};
// using only Macintosh and Windows platform/encoding names
if ((r.platform === 1 && r.encoding === 0 && r.language === 0) ||
(r.platform === 3 && r.encoding === 1 && r.language === 0x409)) {
records.push(r);
}
}
for (i = 0, ii = records.length; i < ii; i++) {
var record = records[i];
if (record.length <= 0) {
continue; // Nothing to process, ignoring.
}
var pos = start + stringsStart + record.offset;
if (pos + record.length > end) {
continue; // outside of name table, ignoring
}
font.pos = pos;
var nameIndex = record.name;
if (record.encoding) {
// unicode
var str = '';
for (var j = 0, jj = record.length; j < jj; j += 2) {
str += String.fromCharCode(font.getUint16());
}
names[1][nameIndex] = str;
} else {
names[0][nameIndex] = bytesToString(font.getBytes(record.length));
}
}
return names;
}
var TTOpsStackDeltas = [
0, 0, 0, 0, 0, 0, 0, 0, -2, -2, -2, -2, 0, 0, -2, -5,
-1, -1, -1, -1, -1, -1, -1, -1, 0, 0, -1, 0, -1, -1, -1, -1,
1, -1, -999, 0, 1, 0, -1, -2, 0, -1, -2, -1, -1, 0, -1, -1,
0, 0, -999, -999, -1, -1, -1, -1, -2, -999, -2, -2, -999, 0, -2, -2,
0, 0, -2, 0, -2, 0, 0, 0, -2, -1, -1, 1, 1, 0, 0, -1,
-1, -1, -1, -1, -1, -1, 0, 0, -1, 0, -1, -1, 0, -999, -1, -1,
-1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-2, -999, -999, -999, -999, -999, -1, -1, -2, -2, 0, 0, 0, 0, -1, -1,
-999, -2, -2, 0, 0, -1, -2, -2, 0, 0, 0, -1, -1, -1, -2];
// 0xC0-DF == -1 and 0xE0-FF == -2
function sanitizeTTProgram(table, ttContext) {
var data = table.data;
var i = 0, j, n, b, funcId, pc, lastEndf = 0, lastDeff = 0;
var stack = [];
var callstack = [];
var functionsCalled = [];
var tooComplexToFollowFunctions =
ttContext.tooComplexToFollowFunctions;
var inFDEF = false, ifLevel = 0, inELSE = 0;
for (var ii = data.length; i < ii;) {
var op = data[i++];
// The TrueType instruction set docs can be found at
// https://developer.apple.com/fonts/TTRefMan/RM05/Chap5.html
if (op === 0x40) { // NPUSHB - pushes n bytes
n = data[i++];
if (inFDEF || inELSE) {
i += n;
} else {
for (j = 0; j < n; j++) {
stack.push(data[i++]);
}
}
} else if (op === 0x41) { // NPUSHW - pushes n words
n = data[i++];
if (inFDEF || inELSE) {
i += n * 2;
} else {
for (j = 0; j < n; j++) {
b = data[i++];
stack.push((b << 8) | data[i++]);
}
}
} else if ((op & 0xF8) === 0xB0) { // PUSHB - pushes bytes
n = op - 0xB0 + 1;
if (inFDEF || inELSE) {
i += n;
} else {
for (j = 0; j < n; j++) {
stack.push(data[i++]);
}
}
} else if ((op & 0xF8) === 0xB8) { // PUSHW - pushes words
n = op - 0xB8 + 1;
if (inFDEF || inELSE) {
i += n * 2;
} else {
for (j = 0; j < n; j++) {
b = data[i++];
stack.push((b << 8) | data[i++]);
}
}
} else if (op === 0x2B && !tooComplexToFollowFunctions) { // CALL
if (!inFDEF && !inELSE) {
// collecting information about which functions are used
funcId = stack[stack.length - 1];
if (isNaN(funcId)) {
info('TT: CALL empty stack (or invalid entry).');
} else {
ttContext.functionsUsed[funcId] = true;
if (funcId in ttContext.functionsStackDeltas) {
let newStackLength = stack.length +
ttContext.functionsStackDeltas[funcId];
if (newStackLength < 0) {
warn('TT: CALL invalid functions stack delta.');
ttContext.hintsValid = false;
return;
}
stack.length = newStackLength;
} else if (funcId in ttContext.functionsDefined &&
!functionsCalled.includes(funcId)) {
callstack.push({ data, i, stackTop: stack.length - 1, });
functionsCalled.push(funcId);
pc = ttContext.functionsDefined[funcId];
if (!pc) {
warn('TT: CALL non-existent function');
ttContext.hintsValid = false;
return;
}
data = pc.data;
i = pc.i;
}
}
}
} else if (op === 0x2C && !tooComplexToFollowFunctions) { // FDEF
if (inFDEF || inELSE) {
warn('TT: nested FDEFs not allowed');
tooComplexToFollowFunctions = true;
}
inFDEF = true;
// collecting information about which functions are defined
lastDeff = i;
funcId = stack.pop();
ttContext.functionsDefined[funcId] = { data, i, };
} else if (op === 0x2D) { // ENDF - end of function
if (inFDEF) {
inFDEF = false;
lastEndf = i;
} else {
pc = callstack.pop();
if (!pc) {
warn('TT: ENDF bad stack');
ttContext.hintsValid = false;
return;
}
funcId = functionsCalled.pop();
data = pc.data;
i = pc.i;
ttContext.functionsStackDeltas[funcId] =
stack.length - pc.stackTop;
}
} else if (op === 0x89) { // IDEF - instruction definition
if (inFDEF || inELSE) {
warn('TT: nested IDEFs not allowed');
tooComplexToFollowFunctions = true;
}
inFDEF = true;
// recording it as a function to track ENDF
lastDeff = i;
} else if (op === 0x58) { // IF
++ifLevel;
} else if (op === 0x1B) { // ELSE
inELSE = ifLevel;
} else if (op === 0x59) { // EIF
if (inELSE === ifLevel) {
inELSE = 0;
}
--ifLevel;
} else if (op === 0x1C) { // JMPR
if (!inFDEF && !inELSE) {
var offset = stack[stack.length - 1];
// only jumping forward to prevent infinite loop
if (offset > 0) {
i += offset - 1;
}
}
}
// Adjusting stack not extactly, but just enough to get function id
if (!inFDEF && !inELSE) {
var stackDelta = op <= 0x8E ? TTOpsStackDeltas[op] :
op >= 0xC0 && op <= 0xDF ? -1 : op >= 0xE0 ? -2 : 0;
if (op >= 0x71 && op <= 0x75) {
n = stack.pop();
if (!isNaN(n)) {
stackDelta = -n * 2;
}
}
while (stackDelta < 0 && stack.length > 0) {
stack.pop();
stackDelta++;
}
while (stackDelta > 0) {
stack.push(NaN); // pushing any number into stack
stackDelta--;
}
}
}
ttContext.tooComplexToFollowFunctions = tooComplexToFollowFunctions;
var content = [data];
if (i > data.length) {
content.push(new Uint8Array(i - data.length));
}
if (lastDeff > lastEndf) {
warn('TT: complementing a missing function tail');
// new function definition started, but not finished
// complete function by [CLEAR, ENDF]
content.push(new Uint8Array([0x22, 0x2D]));
}
foldTTTable(table, content);
}
function checkInvalidFunctions(ttContext, maxFunctionDefs) {
if (ttContext.tooComplexToFollowFunctions) {
return;
}
if (ttContext.functionsDefined.length > maxFunctionDefs) {
warn('TT: more functions defined than expected');
ttContext.hintsValid = false;
return;
}
for (var j = 0, jj = ttContext.functionsUsed.length; j < jj; j++) {
if (j > maxFunctionDefs) {
warn('TT: invalid function id: ' + j);
ttContext.hintsValid = false;
return;
}
if (ttContext.functionsUsed[j] && !ttContext.functionsDefined[j]) {
warn('TT: undefined function: ' + j);
ttContext.hintsValid = false;
return;
}
}
}
function foldTTTable(table, content) {
if (content.length > 1) {
// concatenating the content items
var newLength = 0;
var j, jj;
for (j = 0, jj = content.length; j < jj; j++) {
newLength += content[j].length;
}
newLength = (newLength + 3) & ~3;
var result = new Uint8Array(newLength);
var pos = 0;
for (j = 0, jj = content.length; j < jj; j++) {
result.set(content[j], pos);
pos += content[j].length;
}
table.data = result;
table.length = newLength;
}
}
function sanitizeTTPrograms(fpgm, prep, cvt, maxFunctionDefs) {
var ttContext = {
functionsDefined: [],
functionsUsed: [],
functionsStackDeltas: [],
tooComplexToFollowFunctions: false,
hintsValid: true,
};
if (fpgm) {
sanitizeTTProgram(fpgm, ttContext);
}
if (prep) {
sanitizeTTProgram(prep, ttContext);
}
if (fpgm) {
checkInvalidFunctions(ttContext, maxFunctionDefs);
}
if (cvt && (cvt.length & 1)) {
var cvtData = new Uint8Array(cvt.length + 1);
cvtData.set(cvt.data);
cvt.data = cvtData;
}
return ttContext.hintsValid;
}
// The following steps modify the original font data, making copy
font = new Stream(new Uint8Array(font.getBytes()));
let header, tables;
if (isTrueTypeCollectionFile(font)) {
let ttcData = readTrueTypeCollectionData(font, this.name);
header = ttcData.header;
tables = ttcData.tables;
} else {
header = readOpenTypeHeader(font);
tables = readTables(font, header.numTables);
}
let cff, cffFile;
var isTrueType = !tables['CFF '];
if (!isTrueType) {
const isComposite = properties.composite &&
((properties.cidToGidMap || []).length > 0 ||
!(properties.cMap instanceof IdentityCMap));
// OpenType font (skip composite fonts with non-default glyph mapping).
if ((header.version === 'OTTO' && !isComposite) ||
!tables['head'] || !tables['hhea'] || !tables['maxp'] ||
!tables['post']) {
// No major tables: throwing everything at `CFFFont`.
cffFile = new Stream(tables['CFF '].data);
cff = new CFFFont(cffFile, properties);
adjustWidths(properties);
return this.convert(name, cff, properties);
}
delete tables['glyf'];
delete tables['loca'];
delete tables['fpgm'];
delete tables['prep'];
delete tables['cvt '];
this.isOpenType = true;
} else {
if (!tables['loca']) {
throw new FormatError('Required "loca" table is not found');
}
if (!tables['glyf']) {
warn('Required "glyf" table is not found -- trying to recover.');
// Note: We use `sanitizeGlyphLocations` to add dummy glyf data below.
tables['glyf'] = {
tag: 'glyf',
data: new Uint8Array(0),
};
}
this.isOpenType = false;
}
if (!tables['maxp']) {
throw new FormatError('Required "maxp" table is not found');
}
font.pos = (font.start || 0) + tables['maxp'].offset;
var version = font.getInt32();
var numGlyphs = font.getUint16();
var maxFunctionDefs = 0;
var maxSizeOfInstructions = 0;
if (version >= 0x00010000 && tables['maxp'].length >= 22) {
// maxZones can be invalid
font.pos += 8;
var maxZones = font.getUint16();
if (maxZones > 2) { // reset to 2 if font has invalid maxZones
tables['maxp'].data[14] = 0;
tables['maxp'].data[15] = 2;
}
font.pos += 4;
maxFunctionDefs = font.getUint16();
font.pos += 4;
maxSizeOfInstructions = font.getUint16();
}
var dupFirstEntry = false;
if (properties.type === 'CIDFontType2' && properties.toUnicode &&
properties.toUnicode.get(0) > '\u0000') {
// oracle's defect (see 3427), duplicating first entry
dupFirstEntry = true;
numGlyphs++;
tables['maxp'].data[4] = numGlyphs >> 8;
tables['maxp'].data[5] = numGlyphs & 255;
}
var hintsValid = sanitizeTTPrograms(tables['fpgm'], tables['prep'],
tables['cvt '], maxFunctionDefs);
if (!hintsValid) {
delete tables['fpgm'];
delete tables['prep'];
delete tables['cvt '];
}
// Ensure the hmtx table contains the advance width and
// sidebearings information for numGlyphs in the maxp table
sanitizeMetrics(font, tables['hhea'], tables['hmtx'], numGlyphs);
if (!tables['head']) {
throw new FormatError('Required "head" table is not found');
}
sanitizeHead(tables['head'], numGlyphs,
isTrueType ? tables['loca'].length : 0);
var missingGlyphs = Object.create(null);
if (isTrueType) {
var isGlyphLocationsLong = int16(tables['head'].data[50],
tables['head'].data[51]);
var glyphsInfo = sanitizeGlyphLocations(tables['loca'], tables['glyf'],
numGlyphs, isGlyphLocationsLong,
hintsValid, dupFirstEntry,
maxSizeOfInstructions);
missingGlyphs = glyphsInfo.missingGlyphs;
// Some fonts have incorrect maxSizeOfInstructions values, so we use
// the computed value instead.
if (version >= 0x00010000 && tables['maxp'].length >= 22) {
tables['maxp'].data[26] = glyphsInfo.maxSizeOfInstructions >> 8;
tables['maxp'].data[27] = glyphsInfo.maxSizeOfInstructions & 255;
}
}
if (!tables['hhea']) {
throw new FormatError('Required "hhea" table is not found');
}
// Sanitizer reduces the glyph advanceWidth to the maxAdvanceWidth
// Sometimes it's 0. That needs to be fixed
if (tables['hhea'].data[10] === 0 && tables['hhea'].data[11] === 0) {
tables['hhea'].data[10] = 0xFF;
tables['hhea'].data[11] = 0xFF;
}
// Extract some more font properties from the OpenType head and
// hhea tables; yMin and descent value are always negative.
var metricsOverride = {
unitsPerEm: int16(tables['head'].data[18], tables['head'].data[19]),
yMax: int16(tables['head'].data[42], tables['head'].data[43]),
yMin: signedInt16(tables['head'].data[38], tables['head'].data[39]),
ascent: int16(tables['hhea'].data[4], tables['hhea'].data[5]),
descent: signedInt16(tables['hhea'].data[6], tables['hhea'].data[7]),
};
// PDF FontDescriptor metrics lie -- using data from actual font.
this.ascent = metricsOverride.ascent / metricsOverride.unitsPerEm;
this.descent = metricsOverride.descent / metricsOverride.unitsPerEm;
// The 'post' table has glyphs names.
if (tables['post']) {
var valid = readPostScriptTable(tables['post'], properties, numGlyphs);
if (!valid) {
tables['post'] = null;
}
}
var charCodeToGlyphId = [], charCode;
// Helper function to try to skip mapping of empty glyphs.
function hasGlyph(glyphId) {
return !missingGlyphs[glyphId];
}
if (properties.composite) {
var cidToGidMap = properties.cidToGidMap || [];
var isCidToGidMapEmpty = cidToGidMap.length === 0;
properties.cMap.forEach(function(charCode, cid) {
if (cid > 0xffff) {
throw new FormatError('Max size of CID is 65,535');
}
var glyphId = -1;
if (isCidToGidMapEmpty) {
glyphId = cid;
} else if (cidToGidMap[cid] !== undefined) {
glyphId = cidToGidMap[cid];
}
if (glyphId >= 0 && glyphId < numGlyphs && hasGlyph(glyphId)) {
charCodeToGlyphId[charCode] = glyphId;
}
});
if (dupFirstEntry && (isCidToGidMapEmpty || !charCodeToGlyphId[0])) {
// We don't duplicate the first entry in the `charCodeToGlyphId` map
// if the font has a `CIDToGIDMap` which has already mapped the first
// entry to a non-zero `glyphId` (fixes issue7544.pdf).
charCodeToGlyphId[0] = numGlyphs - 1;
}
} else {
// Most of the following logic in this code branch is based on the
// 9.6.6.4 of the PDF spec.
var cmapTable = readCmapTable(tables['cmap'], font, this.isSymbolicFont,
properties.hasEncoding);
var cmapPlatformId = cmapTable.platformId;
var cmapEncodingId = cmapTable.encodingId;
var cmapMappings = cmapTable.mappings;
var cmapMappingsLength = cmapMappings.length;
// The spec seems to imply that if the font is symbolic the encoding
// should be ignored, this doesn't appear to work for 'preistabelle.pdf'
// where the the font is symbolic and it has an encoding.
if (properties.hasEncoding &&
(cmapPlatformId === 3 && cmapEncodingId === 1 ||
cmapPlatformId === 1 && cmapEncodingId === 0) ||
(cmapPlatformId === -1 && cmapEncodingId === -1 && // Temporary hack
!!getEncoding(properties.baseEncodingName))) { // Temporary hack
// When no preferred cmap table was found and |baseEncodingName| is
// one of the predefined encodings, we seem to obtain a better
// |charCodeToGlyphId| map from the code below (fixes bug 1057544).
// TODO: Note that this is a hack which should be removed as soon as
// we have proper support for more exotic cmap tables.
var baseEncoding = [];
if (properties.baseEncodingName === 'MacRomanEncoding' ||
properties.baseEncodingName === 'WinAnsiEncoding') {
baseEncoding = getEncoding(properties.baseEncodingName);
}
var glyphsUnicodeMap = getGlyphsUnicode();
for (charCode = 0; charCode < 256; charCode++) {
var glyphName, standardGlyphName;
if (this.differences && charCode in this.differences) {
glyphName = this.differences[charCode];
} else if (charCode in baseEncoding &&
baseEncoding[charCode] !== '') {
glyphName = baseEncoding[charCode];
} else {
glyphName = StandardEncoding[charCode];
}
if (!glyphName) {
continue;
}
// Ensure that non-standard glyph names are resolved to valid ones.
standardGlyphName = recoverGlyphName(glyphName, glyphsUnicodeMap);
var unicodeOrCharCode;
if (cmapPlatformId === 3 && cmapEncodingId === 1) {
unicodeOrCharCode = glyphsUnicodeMap[standardGlyphName];
} else if (cmapPlatformId === 1 && cmapEncodingId === 0) {
// TODO: the encoding needs to be updated with mac os table.
unicodeOrCharCode = MacRomanEncoding.indexOf(standardGlyphName);
}
var found = false;
for (let i = 0; i < cmapMappingsLength; ++i) {
if (cmapMappings[i].charCode !== unicodeOrCharCode) {
continue;
}
charCodeToGlyphId[charCode] = cmapMappings[i].glyphId;
found = true;
break;
}
if (!found && properties.glyphNames) {
// Try to map using the post table.
var glyphId = properties.glyphNames.indexOf(glyphName);
// The post table ought to use the same kind of glyph names as the
// `differences` array, but check the standard ones as a fallback.
if (glyphId === -1 && standardGlyphName !== glyphName) {
glyphId = properties.glyphNames.indexOf(standardGlyphName);
}
if (glyphId > 0 && hasGlyph(glyphId)) {
charCodeToGlyphId[charCode] = glyphId;
}
}
}
} else if (cmapPlatformId === 0 && cmapEncodingId === 0) {
// Default Unicode semantics, use the charcodes as is.
for (let i = 0; i < cmapMappingsLength; ++i) {
charCodeToGlyphId[cmapMappings[i].charCode] =
cmapMappings[i].glyphId;
}
} else {
// When there is only a (1, 0) cmap table, the char code is a single
// byte and it is used directly as the char code.
// When a (3, 0) cmap table is present, it is used instead but the
// spec has special rules for char codes in the range of 0xF000 to
// 0xF0FF and it says the (3, 0) table should map the values from
// the (1, 0) table by prepending 0xF0 to the char codes. To reverse
// this, the upper bits of the char code are cleared, but only for the
// special range since some PDFs have char codes outside of this range
// (e.g. 0x2013) which when masked would overwrite other values in the
// cmap.
for (let i = 0; i < cmapMappingsLength; ++i) {
charCode = cmapMappings[i].charCode;
if (cmapPlatformId === 3 &&
charCode >= 0xF000 && charCode <= 0xF0FF) {
charCode &= 0xFF;
}
charCodeToGlyphId[charCode] = cmapMappings[i].glyphId;
}
}
}
if (charCodeToGlyphId.length === 0) {
// defines at least one glyph
charCodeToGlyphId[0] = 0;
}
// Converting glyphs and ids into font's cmap table
var newMapping = adjustMapping(charCodeToGlyphId, properties,
missingGlyphs);
this.toFontChar = newMapping.toFontChar;
tables['cmap'] = {
tag: 'cmap',
data: createCmapTable(newMapping.charCodeToGlyphId, numGlyphs),
};
if (!tables['OS/2'] || !validateOS2Table(tables['OS/2'])) {
tables['OS/2'] = {
tag: 'OS/2',
data: createOS2Table(properties, newMapping.charCodeToGlyphId,
metricsOverride),
};
}
// Rewrite the 'post' table if needed
if (!tables['post']) {
tables['post'] = {
tag: 'post',
data: createPostTable(properties),
};
}
if (!isTrueType) {
try {
// Trying to repair CFF file
cffFile = new Stream(tables['CFF '].data);
var parser = new CFFParser(cffFile, properties,
SEAC_ANALYSIS_ENABLED);
cff = parser.parse();
var compiler = new CFFCompiler(cff);
tables['CFF '].data = compiler.compile();
} catch (e) {
warn('Failed to compile font ' + properties.loadedName);
}
}
// Re-creating 'name' table
if (!tables['name']) {
tables['name'] = {
tag: 'name',
data: createNameTable(this.name),
};
} else {
// ... using existing 'name' table as prototype
var namePrototype = readNameTable(tables['name']);
tables['name'].data = createNameTable(name, namePrototype);
}
var builder = new OpenTypeFileBuilder(header.version);
for (var tableTag in tables) {
builder.addTable(tableTag, tables[tableTag].data);
}
return builder.toArray();
},
convert: function Font_convert(fontName, font, properties) {
// TODO: Check the charstring widths to determine this.
properties.fixedPitch = false;
if (properties.builtInEncoding) {
// For Type1 fonts that do not include either `ToUnicode` or `Encoding`
// data, attempt to use the `builtInEncoding` to improve text selection.
adjustToUnicode(properties, properties.builtInEncoding);
}
var mapping = font.getGlyphMapping(properties);
var newMapping = adjustMapping(mapping, properties, Object.create(null));
this.toFontChar = newMapping.toFontChar;
var numGlyphs = font.numGlyphs;
function getCharCodes(charCodeToGlyphId, glyphId) {
var charCodes = null;
for (var charCode in charCodeToGlyphId) {
if (glyphId === charCodeToGlyphId[charCode]) {
if (!charCodes) {
charCodes = [];
}
charCodes.push(charCode | 0);
}
}
return charCodes;
}
function createCharCode(charCodeToGlyphId, glyphId) {
for (var charCode in charCodeToGlyphId) {
if (glyphId === charCodeToGlyphId[charCode]) {
return charCode | 0;
}
}
newMapping.charCodeToGlyphId[newMapping.nextAvailableFontCharCode] =
glyphId;
return newMapping.nextAvailableFontCharCode++;
}
var seacs = font.seacs;
if (SEAC_ANALYSIS_ENABLED && seacs && seacs.length) {
var matrix = properties.fontMatrix || FONT_IDENTITY_MATRIX;
var charset = font.getCharset();
var seacMap = Object.create(null);
for (var glyphId in seacs) {
glyphId |= 0;
var seac = seacs[glyphId];
var baseGlyphName = StandardEncoding[seac[2]];
var accentGlyphName = StandardEncoding[seac[3]];
var baseGlyphId = charset.indexOf(baseGlyphName);
var accentGlyphId = charset.indexOf(accentGlyphName);
if (baseGlyphId < 0 || accentGlyphId < 0) {
continue;
}
var accentOffset = {
x: seac[0] * matrix[0] + seac[1] * matrix[2] + matrix[4],
y: seac[0] * matrix[1] + seac[1] * matrix[3] + matrix[5],
};
var charCodes = getCharCodes(mapping, glyphId);
if (!charCodes) {
// There's no point in mapping it if the char code was never mapped
// to begin with.
continue;
}
for (var i = 0, ii = charCodes.length; i < ii; i++) {
var charCode = charCodes[i];
// Find a fontCharCode that maps to the base and accent glyphs.
// If one doesn't exists, create it.
var charCodeToGlyphId = newMapping.charCodeToGlyphId;
var baseFontCharCode = createCharCode(charCodeToGlyphId,
baseGlyphId);
var accentFontCharCode = createCharCode(charCodeToGlyphId,
accentGlyphId);
seacMap[charCode] = {
baseFontCharCode,
accentFontCharCode,
accentOffset,
};
}
}
properties.seacMap = seacMap;
}
var unitsPerEm = 1 / (properties.fontMatrix || FONT_IDENTITY_MATRIX)[0];
var builder = new OpenTypeFileBuilder('\x4F\x54\x54\x4F');
// PostScript Font Program
builder.addTable('CFF ', font.data);
// OS/2 and Windows Specific metrics
builder.addTable('OS/2', createOS2Table(properties,
newMapping.charCodeToGlyphId));
// Character to glyphs mapping
builder.addTable('cmap', createCmapTable(newMapping.charCodeToGlyphId,
numGlyphs));
// Font header
builder.addTable('head',
'\x00\x01\x00\x00' + // Version number
'\x00\x00\x10\x00' + // fontRevision
'\x00\x00\x00\x00' + // checksumAdjustement
'\x5F\x0F\x3C\xF5' + // magicNumber
'\x00\x00' + // Flags
safeString16(unitsPerEm) + // unitsPerEM
'\x00\x00\x00\x00\x9e\x0b\x7e\x27' + // creation date
'\x00\x00\x00\x00\x9e\x0b\x7e\x27' + // modifification date
'\x00\x00' + // xMin
safeString16(properties.descent) + // yMin
'\x0F\xFF' + // xMax
safeString16(properties.ascent) + // yMax
string16(properties.italicAngle ? 2 : 0) + // macStyle
'\x00\x11' + // lowestRecPPEM
'\x00\x00' + // fontDirectionHint
'\x00\x00' + // indexToLocFormat
'\x00\x00'); // glyphDataFormat
// Horizontal header
builder.addTable('hhea',
'\x00\x01\x00\x00' + // Version number
safeString16(properties.ascent) + // Typographic Ascent
safeString16(properties.descent) + // Typographic Descent
'\x00\x00' + // Line Gap
'\xFF\xFF' + // advanceWidthMax
'\x00\x00' + // minLeftSidebearing
'\x00\x00' + // minRightSidebearing
'\x00\x00' + // xMaxExtent
safeString16(properties.capHeight) + // caretSlopeRise
safeString16(Math.tan(properties.italicAngle) *
properties.xHeight) + // caretSlopeRun
'\x00\x00' + // caretOffset
'\x00\x00' + // -reserved-
'\x00\x00' + // -reserved-
'\x00\x00' + // -reserved-
'\x00\x00' + // -reserved-
'\x00\x00' + // metricDataFormat
string16(numGlyphs)); // Number of HMetrics
// Horizontal metrics
builder.addTable('hmtx', (function fontFieldsHmtx() {
var charstrings = font.charstrings;
var cffWidths = font.cff ? font.cff.widths : null;
var hmtx = '\x00\x00\x00\x00'; // Fake .notdef
for (var i = 1, ii = numGlyphs; i < ii; i++) {
var width = 0;
if (charstrings) {
var charstring = charstrings[i - 1];
width = 'width' in charstring ? charstring.width : 0;
} else if (cffWidths) {
width = Math.ceil(cffWidths[i] || 0);
}
hmtx += string16(width) + string16(0);
}
return hmtx;
})());
// Maximum profile
builder.addTable('maxp',
'\x00\x00\x50\x00' + // Version number
string16(numGlyphs)); // Num of glyphs
// Naming tables
builder.addTable('name', createNameTable(fontName));
// PostScript information
builder.addTable('post', createPostTable(properties));
return builder.toArray();
},
get spaceWidth() {
if ('_shadowWidth' in this) {
return this._shadowWidth;
}
// trying to estimate space character width
var possibleSpaceReplacements = ['space', 'minus', 'one', 'i', 'I'];
var width;
for (var i = 0, ii = possibleSpaceReplacements.length; i < ii; i++) {
var glyphName = possibleSpaceReplacements[i];
// if possible, getting width by glyph name
if (glyphName in this.widths) {
width = this.widths[glyphName];
break;
}
var glyphsUnicodeMap = getGlyphsUnicode();
var glyphUnicode = glyphsUnicodeMap[glyphName];
// finding the charcode via unicodeToCID map
var charcode = 0;
if (this.composite) {
if (this.cMap.contains(glyphUnicode)) {
charcode = this.cMap.lookup(glyphUnicode);
}
}
// ... via toUnicode map
if (!charcode && this.toUnicode) {
charcode = this.toUnicode.charCodeOf(glyphUnicode);
}
// setting it to unicode if negative or undefined
if (charcode <= 0) {
charcode = glyphUnicode;
}
// trying to get width via charcode
width = this.widths[charcode];
if (width) {
break; // the non-zero width found
}
}
width = width || this.defaultWidth;
// Do not shadow the property here. See discussion:
// https://github.com/mozilla/pdf.js/pull/2127#discussion_r1662280
this._shadowWidth = width;
return width;
},
charToGlyph: function Font_charToGlyph(charcode, isSpace) {
var fontCharCode, width, operatorListId;
var widthCode = charcode;
if (this.cMap && this.cMap.contains(charcode)) {
widthCode = this.cMap.lookup(charcode);
}
width = this.widths[widthCode];
width = isNum(width) ? width : this.defaultWidth;
var vmetric = this.vmetrics && this.vmetrics[widthCode];
let unicode = this.toUnicode.get(charcode) ||
this.fallbackToUnicode.get(charcode) || charcode;
if (typeof unicode === 'number') {
unicode = String.fromCharCode(unicode);
}
var isInFont = charcode in this.toFontChar;
// First try the toFontChar map, if it's not there then try falling
// back to the char code.
fontCharCode = this.toFontChar[charcode] || charcode;
if (this.missingFile) {
fontCharCode = mapSpecialUnicodeValues(fontCharCode);
}
if (this.isType3Font) {
// Font char code in this case is actually a glyph name.
operatorListId = fontCharCode;
}
var accent = null;
if (this.seacMap && this.seacMap[charcode]) {
isInFont = true;
var seac = this.seacMap[charcode];
fontCharCode = seac.baseFontCharCode;
accent = {
fontChar: String.fromCharCode(seac.accentFontCharCode),
offset: seac.accentOffset,
};
}
var fontChar = String.fromCharCode(fontCharCode);
var glyph = this.glyphCache[charcode];
if (!glyph ||
!glyph.matchesForCache(fontChar, unicode, accent, width, vmetric,
operatorListId, isSpace, isInFont)) {
glyph = new Glyph(fontChar, unicode, accent, width, vmetric,
operatorListId, isSpace, isInFont);
this.glyphCache[charcode] = glyph;
}
return glyph;
},
charsToGlyphs: function Font_charsToGlyphs(chars) {
var charsCache = this.charsCache;
var glyphs, glyph, charcode;
// if we translated this string before, just grab it from the cache
if (charsCache) {
glyphs = charsCache[chars];
if (glyphs) {
return glyphs;
}
}
// lazily create the translation cache
if (!charsCache) {
charsCache = this.charsCache = Object.create(null);
}
glyphs = [];
var charsCacheKey = chars;
var i = 0, ii;
if (this.cMap) {
// composite fonts have multi-byte strings convert the string from
// single-byte to multi-byte
var c = Object.create(null);
while (i < chars.length) {
this.cMap.readCharCode(chars, i, c);
charcode = c.charcode;
var length = c.length;
i += length;
// Space is char with code 0x20 and length 1 in multiple-byte codes.
var isSpace = length === 1 && chars.charCodeAt(i - 1) === 0x20;
glyph = this.charToGlyph(charcode, isSpace);
glyphs.push(glyph);
}
} else {
for (i = 0, ii = chars.length; i < ii; ++i) {
charcode = chars.charCodeAt(i);
glyph = this.charToGlyph(charcode, charcode === 0x20);
glyphs.push(glyph);
}
}
// Enter the translated string into the cache
return (charsCache[charsCacheKey] = glyphs);
},
};
return Font;
})();
var ErrorFont = (function ErrorFontClosure() {
function ErrorFont(error) {
this.error = error;
this.loadedName = 'g_font_error';
this.loading = false;
}
ErrorFont.prototype = {
charsToGlyphs: function ErrorFont_charsToGlyphs() {
return [];
},
exportData: function ErrorFont_exportData() {
return { error: this.error, };
},
};
return ErrorFont;
})();
/**
* Shared logic for building a char code to glyph id mapping for Type1 and
* simple CFF fonts. See section 9.6.6.2 of the spec.
* @param {Object} properties Font properties object.
* @param {Object} builtInEncoding The encoding contained within the actual font
* data.
* @param {Array} glyphNames Array of glyph names where the index is the
* glyph ID.
* @returns {Object} A char code to glyph ID map.
*/
function type1FontGlyphMapping(properties, builtInEncoding, glyphNames) {
var charCodeToGlyphId = Object.create(null);
var glyphId, charCode, baseEncoding;
var isSymbolicFont = !!(properties.flags & FontFlags.Symbolic);
if (properties.baseEncodingName) {
// If a valid base encoding name was used, the mapping is initialized with
// that.
baseEncoding = getEncoding(properties.baseEncodingName);
for (charCode = 0; charCode < baseEncoding.length; charCode++) {
glyphId = glyphNames.indexOf(baseEncoding[charCode]);
if (glyphId >= 0) {
charCodeToGlyphId[charCode] = glyphId;
} else {
charCodeToGlyphId[charCode] = 0; // notdef
}
}
} else if (isSymbolicFont) {
// For a symbolic font the encoding should be the fonts built-in encoding.
for (charCode in builtInEncoding) {
charCodeToGlyphId[charCode] = builtInEncoding[charCode];
}
} else {
// For non-symbolic fonts that don't have a base encoding the standard
// encoding should be used.
baseEncoding = StandardEncoding;
for (charCode = 0; charCode < baseEncoding.length; charCode++) {
glyphId = glyphNames.indexOf(baseEncoding[charCode]);
if (glyphId >= 0) {
charCodeToGlyphId[charCode] = glyphId;
} else {
charCodeToGlyphId[charCode] = 0; // notdef
}
}
}
// Lastly, merge in the differences.
var differences = properties.differences, glyphsUnicodeMap;
if (differences) {
for (charCode in differences) {
var glyphName = differences[charCode];
glyphId = glyphNames.indexOf(glyphName);
if (glyphId === -1) {
if (!glyphsUnicodeMap) {
glyphsUnicodeMap = getGlyphsUnicode();
}
var standardGlyphName = recoverGlyphName(glyphName, glyphsUnicodeMap);
if (standardGlyphName !== glyphName) {
glyphId = glyphNames.indexOf(standardGlyphName);
}
}
if (glyphId >= 0) {
charCodeToGlyphId[charCode] = glyphId;
} else {
charCodeToGlyphId[charCode] = 0; // notdef
}
}
}
return charCodeToGlyphId;
}
// Type1Font is also a CIDFontType0.
var Type1Font = (function Type1FontClosure() {
function findBlock(streamBytes, signature, startIndex) {
var streamBytesLength = streamBytes.length;
var signatureLength = signature.length;
var scanLength = streamBytesLength - signatureLength;
var i = startIndex, j, found = false;
while (i < scanLength) {
j = 0;
while (j < signatureLength && streamBytes[i + j] === signature[j]) {
j++;
}
if (j >= signatureLength) { // `signature` found, skip over whitespace.
i += j;
while (i < streamBytesLength && isSpace(streamBytes[i])) {
i++;
}
found = true;
break;
}
i++;
}
return {
found,
length: i,
};
}
function getHeaderBlock(stream, suggestedLength) {
var EEXEC_SIGNATURE = [0x65, 0x65, 0x78, 0x65, 0x63];
var streamStartPos = stream.pos; // Save the initial stream position.
var headerBytes, headerBytesLength, block;
try {
headerBytes = stream.getBytes(suggestedLength);
headerBytesLength = headerBytes.length;
} catch (ex) {
if (ex instanceof MissingDataException) {
throw ex;
}
// Ignore errors if the `suggestedLength` is huge enough that a Uint8Array
// cannot hold the result of `getBytes`, and fallback to simply checking
// the entire stream (fixes issue3928.pdf).
}
if (headerBytesLength === suggestedLength) {
// Most of the time `suggestedLength` is correct, so to speed things up we
// initially only check the last few bytes to see if the header was found.
// Otherwise we (potentially) check the entire stream to prevent errors in
// `Type1Parser` (fixes issue5686.pdf).
block = findBlock(headerBytes, EEXEC_SIGNATURE,
suggestedLength - 2 * EEXEC_SIGNATURE.length);
if (block.found && block.length === suggestedLength) {
return {
stream: new Stream(headerBytes),
length: suggestedLength,
};
}
}
warn('Invalid "Length1" property in Type1 font -- trying to recover.');
stream.pos = streamStartPos; // Reset the stream position.
var SCAN_BLOCK_LENGTH = 2048;
var actualLength;
while (true) {
var scanBytes = stream.peekBytes(SCAN_BLOCK_LENGTH);
block = findBlock(scanBytes, EEXEC_SIGNATURE, 0);
if (block.length === 0) {
break;
}
stream.pos += block.length; // Update the stream position.
if (block.found) {
actualLength = stream.pos - streamStartPos;
break;
}
}
stream.pos = streamStartPos; // Reset the stream position.
if (actualLength) {
return {
stream: new Stream(stream.getBytes(actualLength)),
length: actualLength,
};
}
warn('Unable to recover "Length1" property in Type1 font -- using as is.');
return {
stream: new Stream(stream.getBytes(suggestedLength)),
length: suggestedLength,
};
}
function getEexecBlock(stream, suggestedLength) {
// We should ideally parse the eexec block to ensure that `suggestedLength`
// is correct, so we don't truncate the block data if it's too small.
// However, this would also require checking if the fixed-content portion
// exists (using the 'Length3' property), and ensuring that it's valid.
//
// Given that `suggestedLength` almost always is correct, all the validation
// would require a great deal of unnecessary parsing for most fonts.
// To save time, we always fetch the entire stream instead, which also avoid
// issues if `suggestedLength` is huge (see comment in `getHeaderBlock`).
//
// NOTE: This means that the function can include the fixed-content portion
// in the returned eexec block. In practice this does *not* seem to matter,
// since `Type1Parser_extractFontProgram` will skip over any non-commands.
var eexecBytes = stream.getBytes();
return {
stream: new Stream(eexecBytes),
length: eexecBytes.length,
};
}
function Type1Font(name, file, properties) {
// Some bad generators embed pfb file as is, we have to strip 6-byte header.
// Also, length1 and length2 might be off by 6 bytes as well.
// http://www.math.ubc.ca/~cass/piscript/type1.pdf
var PFB_HEADER_SIZE = 6;
var headerBlockLength = properties.length1;
var eexecBlockLength = properties.length2;
var pfbHeader = file.peekBytes(PFB_HEADER_SIZE);
var pfbHeaderPresent = pfbHeader[0] === 0x80 && pfbHeader[1] === 0x01;
if (pfbHeaderPresent) {
file.skip(PFB_HEADER_SIZE);
headerBlockLength = (pfbHeader[5] << 24) | (pfbHeader[4] << 16) |
(pfbHeader[3] << 8) | pfbHeader[2];
}
// Get the data block containing glyphs and subrs information
var headerBlock = getHeaderBlock(file, headerBlockLength);
var headerBlockParser = new Type1Parser(headerBlock.stream, false,
SEAC_ANALYSIS_ENABLED);
headerBlockParser.extractFontHeader(properties);
if (pfbHeaderPresent) {
pfbHeader = file.getBytes(PFB_HEADER_SIZE);
eexecBlockLength = (pfbHeader[5] << 24) | (pfbHeader[4] << 16) |
(pfbHeader[3] << 8) | pfbHeader[2];
}
// Decrypt the data blocks and retrieve it's content
var eexecBlock = getEexecBlock(file, eexecBlockLength);
var eexecBlockParser = new Type1Parser(eexecBlock.stream, true,
SEAC_ANALYSIS_ENABLED);
var data = eexecBlockParser.extractFontProgram();
for (var info in data.properties) {
properties[info] = data.properties[info];
}
var charstrings = data.charstrings;
var type2Charstrings = this.getType2Charstrings(charstrings);
var subrs = this.getType2Subrs(data.subrs);
this.charstrings = charstrings;
this.data = this.wrap(name, type2Charstrings, this.charstrings,
subrs, properties);
this.seacs = this.getSeacs(data.charstrings);
}
Type1Font.prototype = {
get numGlyphs() {
return this.charstrings.length + 1;
},
getCharset: function Type1Font_getCharset() {
var charset = ['.notdef'];
var charstrings = this.charstrings;
for (var glyphId = 0; glyphId < charstrings.length; glyphId++) {
charset.push(charstrings[glyphId].glyphName);
}
return charset;
},
getGlyphMapping: function Type1Font_getGlyphMapping(properties) {
var charstrings = this.charstrings;
var glyphNames = ['.notdef'], glyphId;
for (glyphId = 0; glyphId < charstrings.length; glyphId++) {
glyphNames.push(charstrings[glyphId].glyphName);
}
var encoding = properties.builtInEncoding;
if (encoding) {
var builtInEncoding = Object.create(null);
for (var charCode in encoding) {
glyphId = glyphNames.indexOf(encoding[charCode]);
if (glyphId >= 0) {
builtInEncoding[charCode] = glyphId;
}
}
}
return type1FontGlyphMapping(properties, builtInEncoding, glyphNames);
},
getSeacs: function Type1Font_getSeacs(charstrings) {
var i, ii;
var seacMap = [];
for (i = 0, ii = charstrings.length; i < ii; i++) {
var charstring = charstrings[i];
if (charstring.seac) {
// Offset by 1 for .notdef
seacMap[i + 1] = charstring.seac;
}
}
return seacMap;
},
getType2Charstrings: function Type1Font_getType2Charstrings(
type1Charstrings) {
var type2Charstrings = [];
for (var i = 0, ii = type1Charstrings.length; i < ii; i++) {
type2Charstrings.push(type1Charstrings[i].charstring);
}
return type2Charstrings;
},
getType2Subrs: function Type1Font_getType2Subrs(type1Subrs) {
var bias = 0;
var count = type1Subrs.length;
if (count < 1133) {
bias = 107;
} else if (count < 33769) {
bias = 1131;
} else {
bias = 32768;
}
// Add a bunch of empty subrs to deal with the Type2 bias
var type2Subrs = [];
var i;
for (i = 0; i < bias; i++) {
type2Subrs.push([0x0B]);
}
for (i = 0; i < count; i++) {
type2Subrs.push(type1Subrs[i]);
}
return type2Subrs;
},
wrap: function Type1Font_wrap(name, glyphs, charstrings, subrs,
properties) {
var cff = new CFF();
cff.header = new CFFHeader(1, 0, 4, 4);
cff.names = [name];
var topDict = new CFFTopDict();
// CFF strings IDs 0...390 are predefined names, so refering
// to entries in our own String INDEX starts at SID 391.
topDict.setByName('version', 391);
topDict.setByName('Notice', 392);
topDict.setByName('FullName', 393);
topDict.setByName('FamilyName', 394);
topDict.setByName('Weight', 395);
topDict.setByName('Encoding', null); // placeholder
topDict.setByName('FontMatrix', properties.fontMatrix);
topDict.setByName('FontBBox', properties.bbox);
topDict.setByName('charset', null); // placeholder
topDict.setByName('CharStrings', null); // placeholder
topDict.setByName('Private', null); // placeholder
cff.topDict = topDict;
var strings = new CFFStrings();
strings.add('Version 0.11'); // Version
strings.add('See original notice'); // Notice
strings.add(name); // FullName
strings.add(name); // FamilyName
strings.add('Medium'); // Weight
cff.strings = strings;
cff.globalSubrIndex = new CFFIndex();
var count = glyphs.length;
var charsetArray = [0];
var i, ii;
for (i = 0; i < count; i++) {
var index = CFFStandardStrings.indexOf(charstrings[i].glyphName);
// TODO: Insert the string and correctly map it. Previously it was
// thought mapping names that aren't in the standard strings to .notdef
// was fine, however in issue818 when mapping them all to .notdef the
// adieresis glyph no longer worked.
if (index === -1) {
index = 0;
}
charsetArray.push((index >> 8) & 0xff, index & 0xff);
}
cff.charset = new CFFCharset(false, 0, [], charsetArray);
var charStringsIndex = new CFFIndex();
charStringsIndex.add([0x8B, 0x0E]); // .notdef
for (i = 0; i < count; i++) {
var glyph = glyphs[i];
// If the CharString outline is empty, replace it with .notdef to
// prevent OTS from rejecting the font (fixes bug1252420.pdf).
if (glyph.length === 0) {
charStringsIndex.add([0x8B, 0x0E]); // .notdef
continue;
}
charStringsIndex.add(glyph);
}
cff.charStrings = charStringsIndex;
var privateDict = new CFFPrivateDict();
privateDict.setByName('Subrs', null); // placeholder
var fields = [
'BlueValues',
'OtherBlues',
'FamilyBlues',
'FamilyOtherBlues',
'StemSnapH',
'StemSnapV',
'BlueShift',
'BlueFuzz',
'BlueScale',
'LanguageGroup',
'ExpansionFactor',
'ForceBold',
'StdHW',
'StdVW'
];
for (i = 0, ii = fields.length; i < ii; i++) {
var field = fields[i];
if (!(field in properties.privateData)) {
continue;
}
var value = properties.privateData[field];
if (Array.isArray(value)) {
// All of the private dictionary array data in CFF must be stored as
// "delta-encoded" numbers.
for (var j = value.length - 1; j > 0; j--) {
value[j] -= value[j - 1]; // ... difference from previous value
}
}
privateDict.setByName(field, value);
}
cff.topDict.privateDict = privateDict;
var subrIndex = new CFFIndex();
for (i = 0, ii = subrs.length; i < ii; i++) {
subrIndex.add(subrs[i]);
}
privateDict.subrsIndex = subrIndex;
var compiler = new CFFCompiler(cff);
return compiler.compile();
},
};
return Type1Font;
})();
var CFFFont = (function CFFFontClosure() {
function CFFFont(file, properties) {
this.properties = properties;
var parser = new CFFParser(file, properties, SEAC_ANALYSIS_ENABLED);
this.cff = parser.parse();
var compiler = new CFFCompiler(this.cff);
this.seacs = this.cff.seacs;
try {
this.data = compiler.compile();
} catch (e) {
warn('Failed to compile font ' + properties.loadedName);
// There may have just been an issue with the compiler, set the data
// anyway and hope the font loaded.
this.data = file;
}
}
CFFFont.prototype = {
get numGlyphs() {
return this.cff.charStrings.count;
},
getCharset: function CFFFont_getCharset() {
return this.cff.charset.charset;
},
getGlyphMapping: function CFFFont_getGlyphMapping() {
var cff = this.cff;
var properties = this.properties;
var charsets = cff.charset.charset;
var charCodeToGlyphId;
var glyphId;
if (properties.composite) {
charCodeToGlyphId = Object.create(null);
if (cff.isCIDFont) {
// If the font is actually a CID font then we should use the charset
// to map CIDs to GIDs.
for (glyphId = 0; glyphId < charsets.length; glyphId++) {
var cid = charsets[glyphId];
var charCode = properties.cMap.charCodeOf(cid);
charCodeToGlyphId[charCode] = glyphId;
}
} else {
// If it is NOT actually a CID font then CIDs should be mapped
// directly to GIDs.
for (glyphId = 0; glyphId < cff.charStrings.count; glyphId++) {
charCodeToGlyphId[glyphId] = glyphId;
}
}
return charCodeToGlyphId;
}
var encoding = cff.encoding ? cff.encoding.encoding : null;
charCodeToGlyphId = type1FontGlyphMapping(properties, encoding, charsets);
return charCodeToGlyphId;
},
};
return CFFFont;
})();
// Workaround for seac on Windows.
(function checkSeacSupport() {
if (typeof navigator !== 'undefined' && /Windows/.test(navigator.userAgent)) {
SEAC_ANALYSIS_ENABLED = true;
}
})();
// Workaround for Private Use Area characters in Chrome on Windows
// http://code.google.com/p/chromium/issues/detail?id=122465
// https://github.com/mozilla/pdf.js/issues/1689
(function checkChromeWindows() {
if (typeof navigator !== 'undefined' &&
/Windows.*Chrome/.test(navigator.userAgent)) {
SKIP_PRIVATE_USE_RANGE_F000_TO_F01F = true;
}
})();
export {
SEAC_ANALYSIS_ENABLED,
PRIVATE_USE_OFFSET_START,
PRIVATE_USE_OFFSET_END,
ErrorFont,
Font,
FontFlags,
ToUnicodeMap,
IdentityToUnicodeMap,
ProblematicCharRanges,
getFontType,
};
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