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1x | /* Copyright 2017 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.Type1Parser = undefined;
var _util = require('../shared/util');
var _encodings = require('./encodings');
var _stream = require('./stream');
var HINTING_ENABLED = false;
var Type1CharString = function Type1CharStringClosure() {
var COMMAND_MAP = {
'hstem': [1],
'vstem': [3],
'vmoveto': [4],
'rlineto': [5],
'hlineto': [6],
'vlineto': [7],
'rrcurveto': [8],
'callsubr': [10],
'flex': [12, 35],
'drop': [12, 18],
'endchar': [14],
'rmoveto': [21],
'hmoveto': [22],
'vhcurveto': [30],
'hvcurveto': [31]
};
function Type1CharString() {
this.width = 0;
this.lsb = 0;
this.flexing = false;
this.output = [];
this.stack = [];
}
Type1CharString.prototype = {
convert: function Type1CharString_convert(encoded, subrs, seacAnalysisEnabled) {
var count = encoded.length;
var error = false;
var wx, sbx, subrNumber;
for (var i = 0; i < count; i++) {
var value = encoded[i];
if (value < 32) {
if (value === 12) {
value = (value << 8) + encoded[++i];
}
switch (value) {
case 1:
if (!HINTING_ENABLED) {
this.stack = [];
break;
}
error = this.executeCommand(2, COMMAND_MAP.hstem);
break;
case 3:
if (!HINTING_ENABLED) {
this.stack = [];
break;
}
error = this.executeCommand(2, COMMAND_MAP.vstem);
break;
case 4:
if (this.flexing) {
if (this.stack.length < 1) {
error = true;
break;
}
var dy = this.stack.pop();
this.stack.push(0, dy);
break;
}
error = this.executeCommand(1, COMMAND_MAP.vmoveto);
break;
case 5:
error = this.executeCommand(2, COMMAND_MAP.rlineto);
break;
case 6:
error = this.executeCommand(1, COMMAND_MAP.hlineto);
break;
case 7:
error = this.executeCommand(1, COMMAND_MAP.vlineto);
break;
case 8:
error = this.executeCommand(6, COMMAND_MAP.rrcurveto);
break;
case 9:
this.stack = [];
break;
case 10:
if (this.stack.length < 1) {
error = true;
break;
}
subrNumber = this.stack.pop();
if (!subrs[subrNumber]) {
error = true;
break;
}
error = this.convert(subrs[subrNumber], subrs, seacAnalysisEnabled);
break;
case 11:
return error;
case 13:
if (this.stack.length < 2) {
error = true;
break;
}
wx = this.stack.pop();
sbx = this.stack.pop();
this.lsb = sbx;
this.width = wx;
this.stack.push(wx, sbx);
error = this.executeCommand(2, COMMAND_MAP.hmoveto);
break;
case 14:
this.output.push(COMMAND_MAP.endchar[0]);
break;
case 21:
if (this.flexing) {
break;
}
error = this.executeCommand(2, COMMAND_MAP.rmoveto);
break;
case 22:
if (this.flexing) {
this.stack.push(0);
break;
}
error = this.executeCommand(1, COMMAND_MAP.hmoveto);
break;
case 30:
error = this.executeCommand(4, COMMAND_MAP.vhcurveto);
break;
case 31:
error = this.executeCommand(4, COMMAND_MAP.hvcurveto);
break;
case (12 << 8) + 0:
this.stack = [];
break;
case (12 << 8) + 1:
if (!HINTING_ENABLED) {
this.stack = [];
break;
}
error = this.executeCommand(2, COMMAND_MAP.vstem);
break;
case (12 << 8) + 2:
if (!HINTING_ENABLED) {
this.stack = [];
break;
}
error = this.executeCommand(2, COMMAND_MAP.hstem);
break;
case (12 << 8) + 6:
if (seacAnalysisEnabled) {
this.seac = this.stack.splice(-4, 4);
error = this.executeCommand(0, COMMAND_MAP.endchar);
} else {
error = this.executeCommand(4, COMMAND_MAP.endchar);
}
break;
case (12 << 8) + 7:
if (this.stack.length < 4) {
error = true;
break;
}
this.stack.pop();
wx = this.stack.pop();
var sby = this.stack.pop();
sbx = this.stack.pop();
this.lsb = sbx;
this.width = wx;
this.stack.push(wx, sbx, sby);
error = this.executeCommand(3, COMMAND_MAP.rmoveto);
break;
case (12 << 8) + 12:
if (this.stack.length < 2) {
error = true;
break;
}
var num2 = this.stack.pop();
var num1 = this.stack.pop();
this.stack.push(num1 / num2);
break;
case (12 << 8) + 16:
if (this.stack.length < 2) {
error = true;
break;
}
subrNumber = this.stack.pop();
var numArgs = this.stack.pop();
if (subrNumber === 0 && numArgs === 3) {
var flexArgs = this.stack.splice(this.stack.length - 17, 17);
this.stack.push(flexArgs[2] + flexArgs[0], flexArgs[3] + flexArgs[1], flexArgs[4], flexArgs[5], flexArgs[6], flexArgs[7], flexArgs[8], flexArgs[9], flexArgs[10], flexArgs[11], flexArgs[12], flexArgs[13], flexArgs[14]);
error = this.executeCommand(13, COMMAND_MAP.flex, true);
this.flexing = false;
this.stack.push(flexArgs[15], flexArgs[16]);
} else if (subrNumber === 1 && numArgs === 0) {
this.flexing = true;
}
break;
case (12 << 8) + 17:
break;
case (12 << 8) + 33:
this.stack = [];
break;
default:
(0, _util.warn)('Unknown type 1 charstring command of "' + value + '"');
break;
}
if (error) {
break;
}
continue;
} else if (value <= 246) {
value = value - 139;
} else if (value <= 250) {
value = (value - 247) * 256 + encoded[++i] + 108;
} else if (value <= 254) {
value = -((value - 251) * 256) - encoded[++i] - 108;
} else {
value = (encoded[++i] & 0xff) << 24 | (encoded[++i] & 0xff) << 16 | (encoded[++i] & 0xff) << 8 | (encoded[++i] & 0xff) << 0;
}
this.stack.push(value);
}
return error;
},
executeCommand: function executeCommand(howManyArgs, command, keepStack) {
var stackLength = this.stack.length;
if (howManyArgs > stackLength) {
return true;
}
var start = stackLength - howManyArgs;
for (var i = start; i < stackLength; i++) {
var value = this.stack[i];
if (Number.isInteger(value)) {
this.output.push(28, value >> 8 & 0xff, value & 0xff);
} else {
value = 65536 * value | 0;
this.output.push(255, value >> 24 & 0xFF, value >> 16 & 0xFF, value >> 8 & 0xFF, value & 0xFF);
}
}
this.output.push.apply(this.output, command);
if (keepStack) {
this.stack.splice(start, howManyArgs);
} else {
this.stack.length = 0;
}
return false;
}
};
return Type1CharString;
}();
var Type1Parser = function Type1ParserClosure() {
var EEXEC_ENCRYPT_KEY = 55665;
var CHAR_STRS_ENCRYPT_KEY = 4330;
function isHexDigit(code) {
return code >= 48 && code <= 57 || code >= 65 && code <= 70 || code >= 97 && code <= 102;
}
function decrypt(data, key, discardNumber) {
Eif (discardNumber >= data.length) {
return new Uint8Array(0);
}
var r = key | 0,
c1 = 52845,
c2 = 22719,
i,
j;
for (i = 0; i < discardNumber; i++) {
r = (data[i] + r) * c1 + c2 & (1 << 16) - 1;
}
var count = data.length - discardNumber;
var decrypted = new Uint8Array(count);
for (i = discardNumber, j = 0; j < count; i++, j++) {
var value = data[i];
decrypted[j] = value ^ r >> 8;
r = (value + r) * c1 + c2 & (1 << 16) - 1;
}
return decrypted;
}
function decryptAscii(data, key, discardNumber) {
var r = key | 0,
c1 = 52845,
c2 = 22719;
var count = data.length,
maybeLength = count >>> 1;
var decrypted = new Uint8Array(maybeLength);
var i, j;
for (i = 0, j = 0; i < count; i++) {
var digit1 = data[i];
if (!isHexDigit(digit1)) {
continue;
}
i++;
var digit2;
while (i < count && !isHexDigit(digit2 = data[i])) {
i++;
}
if (i < count) {
var value = parseInt(String.fromCharCode(digit1, digit2), 16);
decrypted[j++] = value ^ r >> 8;
r = (value + r) * c1 + c2 & (1 << 16) - 1;
}
}
return Array.prototype.slice.call(decrypted, discardNumber, j);
}
function isSpecial(c) {
return c === 0x2F || c === 0x5B || c === 0x5D || c === 0x7B || c === 0x7D || c === 0x28 || c === 0x29;
}
function Type1Parser(stream, encrypted, seacAnalysisEnabled) {
Iif (encrypted) {
var data = stream.getBytes();
var isBinary = !(isHexDigit(data[0]) && isHexDigit(data[1]) && isHexDigit(data[2]) && isHexDigit(data[3]));
stream = new _stream.Stream(isBinary ? decrypt(data, EEXEC_ENCRYPT_KEY, 4) : decryptAscii(data, EEXEC_ENCRYPT_KEY, 4));
}
this.seacAnalysisEnabled = !!seacAnalysisEnabled;
this.stream = stream;
this.nextChar();
}
Type1Parser.prototype = {
readNumberArray: function Type1Parser_readNumberArray() {
this.getToken();
var array = [];
while (true) {
var token = this.getToken();
if (token === null || token === ']' || token === '}') {
break;
}
array.push(parseFloat(token || 0));
}
return array;
},
readNumber: function Type1Parser_readNumber() {
var token = this.getToken();
return parseFloat(token || 0);
},
readInt: function Type1Parser_readInt() {
var token = this.getToken();
return parseInt(token || 0, 10) | 0;
},
readBoolean: function Type1Parser_readBoolean() {
var token = this.getToken();
return token === 'true' ? 1 : 0;
},
nextChar: function Type1_nextChar() {
return this.currentChar = this.stream.getByte();
},
getToken: function Type1Parser_getToken() {
var comment = false;
var ch = this.currentChar;
while (true) {
if (ch === -1) {
return null;
}
if (comment) {
if (ch === 0x0A || ch === 0x0D) {
comment = false;
}
} else if (ch === 0x25) {
comment = true;
} else if (!(0, _util.isSpace)(ch)) {
break;
}
ch = this.nextChar();
}
if (isSpecial(ch)) {
this.nextChar();
return String.fromCharCode(ch);
}
var token = '';
do {
token += String.fromCharCode(ch);
ch = this.nextChar();
} while (ch >= 0 && !(0, _util.isSpace)(ch) && !isSpecial(ch));
return token;
},
readCharStrings: function Type1Parser_readCharStrings(bytes, lenIV) {
Iif (lenIV === -1) {
return bytes;
}
return decrypt(bytes, CHAR_STRS_ENCRYPT_KEY, lenIV);
},
extractFontProgram: function Type1Parser_extractFontProgram() {
var stream = this.stream;
var subrs = [],
charstrings = [];
var privateData = Object.create(null);
privateData['lenIV'] = 4;
var program = {
subrs: [],
charstrings: [],
properties: { 'privateData': privateData }
};
var token, length, data, lenIV, encoded;
while ((token = this.getToken()) !== null) {
Iif (token !== '/') {
continue;
}
token = this.getToken();
switch (token) {
case 'CharStrings':
this.getToken();
this.getToken();
this.getToken();
this.getToken();
while (true) {
token = this.getToken();
if (token === null || token === 'end') {
break;
}
Iif (token !== '/') {
continue;
}
var glyph = this.getToken();
length = this.readInt();
this.getToken();
data = stream.makeSubStream(stream.pos, length);
lenIV = program.properties.privateData['lenIV'];
encoded = this.readCharStrings(data.getBytes(), lenIV);
stream.skip(length);
this.nextChar();
token = this.getToken();
Iif (token === 'noaccess') {
this.getToken();
}
charstrings.push({
glyph: glyph,
encoded: encoded
});
}
break;
case 'Subrs':
this.readInt();
this.getToken();
while (this.getToken() === 'dup') {
var index = this.readInt();
length = this.readInt();
this.getToken();
data = stream.makeSubStream(stream.pos, length);
lenIV = program.properties.privateData['lenIV'];
encoded = this.readCharStrings(data.getBytes(), lenIV);
stream.skip(length);
this.nextChar();
token = this.getToken();
Eif (token === 'noaccess') {
this.getToken();
}
subrs[index] = encoded;
}
break;
case 'BlueValues':
case 'OtherBlues':
case 'FamilyBlues':
case 'FamilyOtherBlues':
var blueArray = this.readNumberArray();
if (blueArray.length > 0 && blueArray.length % 2 === 0 && HINTING_ENABLED) {
program.properties.privateData[token] = blueArray;
}
break;
case 'StemSnapH':
case 'StemSnapV':
program.properties.privateData[token] = this.readNumberArray();
break;
case 'StdHW':
case 'StdVW':
program.properties.privateData[token] = this.readNumberArray()[0];
break;
case 'BlueShift':
case 'lenIV':
case 'BlueFuzz':
case 'BlueScale':
case 'LanguageGroup':
case 'ExpansionFactor':
program.properties.privateData[token] = this.readNumber();
break;
case 'ForceBold':
program.properties.privateData[token] = this.readBoolean();
break;
}
}
for (var i = 0; i < charstrings.length; i++) {
glyph = charstrings[i].glyph;
encoded = charstrings[i].encoded;
var charString = new Type1CharString();
var error = charString.convert(encoded, subrs, this.seacAnalysisEnabled);
var output = charString.output;
Iif (error) {
output = [14];
}
program.charstrings.push({
glyphName: glyph,
charstring: output,
width: charString.width,
lsb: charString.lsb,
seac: charString.seac
});
}
return program;
},
extractFontHeader: function Type1Parser_extractFontHeader(properties) {
var token;
while ((token = this.getToken()) !== null) {
if (token !== '/') {
continue;
}
token = this.getToken();
switch (token) {
case 'FontMatrix':
var matrix = this.readNumberArray();
properties.fontMatrix = matrix;
break;
case 'Encoding':
var encodingArg = this.getToken();
var encoding;
Iif (!/^\d+$/.test(encodingArg)) {
encoding = (0, _encodings.getEncoding)(encodingArg);
} else {
encoding = [];
var size = parseInt(encodingArg, 10) | 0;
this.getToken();
for (var j = 0; j < size; j++) {
token = this.getToken();
while (token !== 'dup' && token !== 'def') {
token = this.getToken();
Iif (token === null) {
return;
}
}
if (token === 'def') {
break;
}
var index = this.readInt();
this.getToken();
var glyph = this.getToken();
encoding[index] = glyph;
this.getToken();
}
}
properties.builtInEncoding = encoding;
break;
case 'FontBBox':
var fontBBox = this.readNumberArray();
properties.ascent = Math.max(fontBBox[3], fontBBox[1]);
properties.descent = Math.min(fontBBox[1], fontBBox[3]);
properties.ascentScaled = true;
break;
}
}
}
};
return Type1Parser;
}();
exports.Type1Parser = Type1Parser; |