Yury Delendik
9 years ago
6 changed files with 2476 additions and 2380 deletions
@ -0,0 +1,722 @@
@@ -0,0 +1,722 @@
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/* Copyright 2012 Mozilla Foundation |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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'use strict'; |
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(function (root, factory) { |
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if (typeof define === 'function' && define.amd) { |
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define('pdfjs/core/type1_parser', ['exports', 'pdfjs/shared/util', |
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'pdfjs/core/stream', 'pdfjs/core/parser', 'pdfjs/core/encodings'], |
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factory); |
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} else if (typeof exports !== 'undefined') { |
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factory(exports, require('../shared/util.js'), require('./stream.js'), |
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require('./parser.js'), require('./encodings.js')); |
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} else { |
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factory((root.pdfjsCoreType1Parser = {}), root.pdfjsSharedUtil, |
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root.pdfjsCoreStream, root.pdfjsCoreParser, root.pdfjsCoreEncodings); |
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} |
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}(this, function (exports, sharedUtil, coreStream, coreParser, coreEncodings) { |
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|
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var warn = sharedUtil.warn; |
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var Stream = coreStream.Stream; |
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var Lexer = coreParser.Lexer; |
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var getEncoding = coreEncodings.getEncoding; |
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// Hinting is currently disabled due to unknown problems on windows
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// in tracemonkey and various other pdfs with type1 fonts.
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var HINTING_ENABLED = false; |
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/* |
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* CharStrings are encoded following the the CharString Encoding sequence |
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* describe in Chapter 6 of the "Adobe Type1 Font Format" specification. |
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* The value in a byte indicates a command, a number, or subsequent bytes |
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* that are to be interpreted in a special way. |
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* |
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* CharString Number Encoding: |
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* A CharString byte containing the values from 32 through 255 inclusive |
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* indicate an integer. These values are decoded in four ranges. |
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* |
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* 1. A CharString byte containing a value, v, between 32 and 246 inclusive, |
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* indicate the integer v - 139. Thus, the integer values from -107 through |
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* 107 inclusive may be encoded in single byte. |
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* |
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* 2. A CharString byte containing a value, v, between 247 and 250 inclusive, |
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* indicates an integer involving the next byte, w, according to the formula: |
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* [(v - 247) x 256] + w + 108 |
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* |
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* 3. A CharString byte containing a value, v, between 251 and 254 inclusive, |
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* indicates an integer involving the next byte, w, according to the formula: |
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* -[(v - 251) * 256] - w - 108 |
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* |
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* 4. A CharString containing the value 255 indicates that the next 4 bytes |
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* are a two complement signed integer. The first of these bytes contains the |
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* highest order bits, the second byte contains the next higher order bits |
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* and the fourth byte contain the lowest order bits. |
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* |
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* |
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* CharString Command Encoding: |
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* CharStrings commands are encoded in 1 or 2 bytes. |
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* |
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* Single byte commands are encoded in 1 byte that contains a value between |
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* 0 and 31 inclusive. |
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* If a command byte contains the value 12, then the value in the next byte |
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* indicates a command. This "escape" mechanism allows many extra commands |
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* to be encoded and this encoding technique helps to minimize the length of |
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* the charStrings. |
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*/ |
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var Type1CharString = (function Type1CharStringClosure() { |
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var COMMAND_MAP = { |
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'hstem': [1], |
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'vstem': [3], |
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'vmoveto': [4], |
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'rlineto': [5], |
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'hlineto': [6], |
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'vlineto': [7], |
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'rrcurveto': [8], |
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'callsubr': [10], |
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'flex': [12, 35], |
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'drop' : [12, 18], |
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'endchar': [14], |
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'rmoveto': [21], |
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'hmoveto': [22], |
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'vhcurveto': [30], |
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'hvcurveto': [31] |
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}; |
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function Type1CharString() { |
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this.width = 0; |
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this.lsb = 0; |
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this.flexing = false; |
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this.output = []; |
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this.stack = []; |
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} |
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Type1CharString.prototype = { |
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convert: function Type1CharString_convert(encoded, subrs, |
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seacAnalysisEnabled) { |
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var count = encoded.length; |
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var error = false; |
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var wx, sbx, subrNumber; |
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for (var i = 0; i < count; i++) { |
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var value = encoded[i]; |
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if (value < 32) { |
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if (value === 12) { |
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value = (value << 8) + encoded[++i]; |
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} |
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switch (value) { |
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case 1: // hstem
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if (!HINTING_ENABLED) { |
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this.stack = []; |
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break; |
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} |
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error = this.executeCommand(2, COMMAND_MAP.hstem); |
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break; |
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case 3: // vstem
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if (!HINTING_ENABLED) { |
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this.stack = []; |
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break; |
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} |
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error = this.executeCommand(2, COMMAND_MAP.vstem); |
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break; |
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case 4: // vmoveto
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if (this.flexing) { |
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if (this.stack.length < 1) { |
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error = true; |
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break; |
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} |
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// Add the dx for flex and but also swap the values so they are
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// the right order.
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var dy = this.stack.pop(); |
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this.stack.push(0, dy); |
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break; |
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} |
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error = this.executeCommand(1, COMMAND_MAP.vmoveto); |
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break; |
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case 5: // rlineto
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error = this.executeCommand(2, COMMAND_MAP.rlineto); |
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break; |
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case 6: // hlineto
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error = this.executeCommand(1, COMMAND_MAP.hlineto); |
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break; |
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case 7: // vlineto
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error = this.executeCommand(1, COMMAND_MAP.vlineto); |
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break; |
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case 8: // rrcurveto
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error = this.executeCommand(6, COMMAND_MAP.rrcurveto); |
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break; |
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case 9: // closepath
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// closepath is a Type1 command that does not take argument and is
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// useless in Type2 and it can simply be ignored.
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this.stack = []; |
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break; |
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case 10: // callsubr
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if (this.stack.length < 1) { |
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error = true; |
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break; |
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} |
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subrNumber = this.stack.pop(); |
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error = this.convert(subrs[subrNumber], subrs, |
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seacAnalysisEnabled); |
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break; |
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case 11: // return
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return error; |
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case 13: // hsbw
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if (this.stack.length < 2) { |
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error = true; |
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break; |
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} |
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// To convert to type2 we have to move the width value to the
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// first part of the charstring and then use hmoveto with lsb.
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wx = this.stack.pop(); |
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sbx = this.stack.pop(); |
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this.lsb = sbx; |
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this.width = wx; |
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this.stack.push(wx, sbx); |
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error = this.executeCommand(2, COMMAND_MAP.hmoveto); |
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break; |
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case 14: // endchar
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this.output.push(COMMAND_MAP.endchar[0]); |
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break; |
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case 21: // rmoveto
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if (this.flexing) { |
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break; |
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} |
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error = this.executeCommand(2, COMMAND_MAP.rmoveto); |
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break; |
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case 22: // hmoveto
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if (this.flexing) { |
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// Add the dy for flex.
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this.stack.push(0); |
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break; |
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} |
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error = this.executeCommand(1, COMMAND_MAP.hmoveto); |
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break; |
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case 30: // vhcurveto
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error = this.executeCommand(4, COMMAND_MAP.vhcurveto); |
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break; |
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case 31: // hvcurveto
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error = this.executeCommand(4, COMMAND_MAP.hvcurveto); |
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break; |
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case (12 << 8) + 0: // dotsection
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// dotsection is a Type1 command to specify some hinting feature
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// for dots that do not take a parameter and it can safely be
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// ignored for Type2.
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this.stack = []; |
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break; |
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case (12 << 8) + 1: // vstem3
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if (!HINTING_ENABLED) { |
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this.stack = []; |
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break; |
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} |
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// [vh]stem3 are Type1 only and Type2 supports [vh]stem with
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// multiple parameters, so instead of returning [vh]stem3 take a
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// shortcut and return [vhstem] instead.
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error = this.executeCommand(2, COMMAND_MAP.vstem); |
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break; |
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case (12 << 8) + 2: // hstem3
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if (!HINTING_ENABLED) { |
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this.stack = []; |
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break; |
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} |
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// See vstem3.
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error = this.executeCommand(2, COMMAND_MAP.hstem); |
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break; |
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case (12 << 8) + 6: // seac
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// seac is like type 2's special endchar but it doesn't use the
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// first argument asb, so remove it.
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if (seacAnalysisEnabled) { |
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this.seac = this.stack.splice(-4, 4); |
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error = this.executeCommand(0, COMMAND_MAP.endchar); |
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} else { |
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error = this.executeCommand(4, COMMAND_MAP.endchar); |
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} |
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break; |
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case (12 << 8) + 7: // sbw
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if (this.stack.length < 4) { |
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error = true; |
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break; |
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} |
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// To convert to type2 we have to move the width value to the
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// first part of the charstring and then use rmoveto with
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// (dx, dy). The height argument will not be used for vmtx and
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// vhea tables reconstruction -- ignoring it.
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var wy = this.stack.pop(); |
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wx = this.stack.pop(); |
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var sby = this.stack.pop(); |
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sbx = this.stack.pop(); |
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this.lsb = sbx; |
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this.width = wx; |
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this.stack.push(wx, sbx, sby); |
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error = this.executeCommand(3, COMMAND_MAP.rmoveto); |
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break; |
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case (12 << 8) + 12: // div
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if (this.stack.length < 2) { |
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error = true; |
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break; |
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} |
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var num2 = this.stack.pop(); |
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var num1 = this.stack.pop(); |
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this.stack.push(num1 / num2); |
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break; |
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case (12 << 8) + 16: // callothersubr
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if (this.stack.length < 2) { |
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error = true; |
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break; |
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} |
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subrNumber = this.stack.pop(); |
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var numArgs = this.stack.pop(); |
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if (subrNumber === 0 && numArgs === 3) { |
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var flexArgs = this.stack.splice(this.stack.length - 17, 17); |
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this.stack.push( |
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flexArgs[2] + flexArgs[0], // bcp1x + rpx
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flexArgs[3] + flexArgs[1], // bcp1y + rpy
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flexArgs[4], // bcp2x
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flexArgs[5], // bcp2y
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flexArgs[6], // p2x
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flexArgs[7], // p2y
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flexArgs[8], // bcp3x
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flexArgs[9], // bcp3y
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flexArgs[10], // bcp4x
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flexArgs[11], // bcp4y
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flexArgs[12], // p3x
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flexArgs[13], // p3y
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flexArgs[14] // flexDepth
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// 15 = finalx unused by flex
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// 16 = finaly unused by flex
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); |
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error = this.executeCommand(13, COMMAND_MAP.flex, true); |
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this.flexing = false; |
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this.stack.push(flexArgs[15], flexArgs[16]); |
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} else if (subrNumber === 1 && numArgs === 0) { |
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this.flexing = true; |
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} |
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break; |
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case (12 << 8) + 17: // pop
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// Ignore this since it is only used with othersubr.
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break; |
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case (12 << 8) + 33: // setcurrentpoint
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// Ignore for now.
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this.stack = []; |
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break; |
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default: |
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warn('Unknown type 1 charstring command of "' + value + '"'); |
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break; |
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} |
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if (error) { |
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break; |
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} |
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continue; |
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} else if (value <= 246) { |
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value = value - 139; |
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} else if (value <= 250) { |
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value = ((value - 247) * 256) + encoded[++i] + 108; |
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} else if (value <= 254) { |
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value = -((value - 251) * 256) - encoded[++i] - 108; |
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} else { |
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value = (encoded[++i] & 0xff) << 24 | (encoded[++i] & 0xff) << 16 | |
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(encoded[++i] & 0xff) << 8 | (encoded[++i] & 0xff) << 0; |
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} |
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this.stack.push(value); |
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} |
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return error; |
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}, |
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executeCommand: function(howManyArgs, command, keepStack) { |
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var stackLength = this.stack.length; |
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if (howManyArgs > stackLength) { |
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return true; |
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} |
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var start = stackLength - howManyArgs; |
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for (var i = start; i < stackLength; i++) { |
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var value = this.stack[i]; |
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if (value === (value | 0)) { // int
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this.output.push(28, (value >> 8) & 0xff, value & 0xff); |
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} else { // fixed point
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value = (65536 * value) | 0; |
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this.output.push(255, |
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(value >> 24) & 0xFF, |
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(value >> 16) & 0xFF, |
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(value >> 8) & 0xFF, |
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value & 0xFF); |
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} |
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} |
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this.output.push.apply(this.output, command); |
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if (keepStack) { |
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this.stack.splice(start, howManyArgs); |
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} else { |
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this.stack.length = 0; |
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} |
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return false; |
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} |
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}; |
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return Type1CharString; |
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})(); |
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/* |
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* Type1Parser encapsulate the needed code for parsing a Type1 font |
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* program. Some of its logic depends on the Type2 charstrings |
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* structure. |
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* Note: this doesn't really parse the font since that would require evaluation |
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* of PostScript, but it is possible in most cases to extract what we need |
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* without a full parse. |
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*/ |
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var Type1Parser = (function Type1ParserClosure() { |
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/* |
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* Decrypt a Sequence of Ciphertext Bytes to Produce the Original Sequence |
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* of Plaintext Bytes. The function took a key as a parameter which can be |
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* for decrypting the eexec block of for decoding charStrings. |
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*/ |
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var EEXEC_ENCRYPT_KEY = 55665; |
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var CHAR_STRS_ENCRYPT_KEY = 4330; |
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function isHexDigit(code) { |
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return code >= 48 && code <= 57 || // '0'-'9'
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code >= 65 && code <= 70 || // 'A'-'F'
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code >= 97 && code <= 102; // 'a'-'f'
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} |
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function decrypt(data, key, discardNumber) { |
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if (discardNumber >= data.length) { |
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return new Uint8Array(0); |
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} |
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var r = key | 0, c1 = 52845, c2 = 22719, i, j; |
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for (i = 0; i < discardNumber; i++) { |
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r = ((data[i] + r) * c1 + c2) & ((1 << 16) - 1); |
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} |
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var count = data.length - discardNumber; |
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var decrypted = new Uint8Array(count); |
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for (i = discardNumber, j = 0; j < count; i++, j++) { |
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var value = data[i]; |
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decrypted[j] = value ^ (r >> 8); |
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r = ((value + r) * c1 + c2) & ((1 << 16) - 1); |
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} |
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return decrypted; |
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} |
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|
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function decryptAscii(data, key, discardNumber) { |
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var r = key | 0, c1 = 52845, c2 = 22719; |
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var count = data.length, maybeLength = count >>> 1; |
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var decrypted = new Uint8Array(maybeLength); |
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var i, j; |
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for (i = 0, j = 0; i < count; i++) { |
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var digit1 = data[i]; |
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if (!isHexDigit(digit1)) { |
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continue; |
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} |
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i++; |
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var digit2; |
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while (i < count && !isHexDigit(digit2 = data[i])) { |
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i++; |
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} |
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if (i < count) { |
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var value = parseInt(String.fromCharCode(digit1, digit2), 16); |
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decrypted[j++] = value ^ (r >> 8); |
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r = ((value + r) * c1 + c2) & ((1 << 16) - 1); |
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} |
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} |
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return Array.prototype.slice.call(decrypted, discardNumber, j); |
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} |
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function isSpecial(c) { |
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return c === 0x2F || // '/'
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c === 0x5B || c === 0x5D || // '[', ']'
|
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c === 0x7B || c === 0x7D || // '{', '}'
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c === 0x28 || c === 0x29; // '(', ')'
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} |
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|
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function Type1Parser(stream, encrypted, seacAnalysisEnabled) { |
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if (encrypted) { |
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var data = stream.getBytes(); |
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var isBinary = !(isHexDigit(data[0]) && isHexDigit(data[1]) && |
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isHexDigit(data[2]) && isHexDigit(data[3])); |
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stream = new Stream(isBinary ? decrypt(data, EEXEC_ENCRYPT_KEY, 4) : |
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decryptAscii(data, EEXEC_ENCRYPT_KEY, 4)); |
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} |
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this.seacAnalysisEnabled = !!seacAnalysisEnabled; |
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this.stream = stream; |
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this.nextChar(); |
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} |
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|
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Type1Parser.prototype = { |
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readNumberArray: function Type1Parser_readNumberArray() { |
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this.getToken(); // read '[' or '{' (arrays can start with either)
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var array = []; |
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while (true) { |
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var token = this.getToken(); |
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if (token === null || token === ']' || token === '}') { |
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break; |
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} |
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array.push(parseFloat(token || 0)); |
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} |
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return array; |
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}, |
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|
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readNumber: function Type1Parser_readNumber() { |
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var token = this.getToken(); |
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return parseFloat(token || 0); |
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}, |
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|
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readInt: function Type1Parser_readInt() { |
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// Use '| 0' to prevent setting a double into length such as the double
|
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// does not flow into the loop variable.
|
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var token = this.getToken(); |
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return parseInt(token || 0, 10) | 0; |
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}, |
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|
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readBoolean: function Type1Parser_readBoolean() { |
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var token = this.getToken(); |
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|
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// Use 1 and 0 since that's what type2 charstrings use.
|
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return token === 'true' ? 1 : 0; |
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}, |
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|
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nextChar : function Type1_nextChar() { |
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return (this.currentChar = this.stream.getByte()); |
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}, |
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|
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getToken: function Type1Parser_getToken() { |
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// Eat whitespace and comments.
|
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var comment = false; |
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var ch = this.currentChar; |
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while (true) { |
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if (ch === -1) { |
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return null; |
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} |
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|
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if (comment) { |
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if (ch === 0x0A || ch === 0x0D) { |
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comment = false; |
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} |
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} else if (ch === 0x25) { // '%'
|
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comment = true; |
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} else if (!Lexer.isSpace(ch)) { |
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break; |
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} |
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ch = this.nextChar(); |
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} |
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if (isSpecial(ch)) { |
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this.nextChar(); |
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return String.fromCharCode(ch); |
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} |
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var token = ''; |
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do { |
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token += String.fromCharCode(ch); |
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ch = this.nextChar(); |
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} while (ch >= 0 && !Lexer.isSpace(ch) && !isSpecial(ch)); |
||||
return token; |
||||
}, |
||||
|
||||
/* |
||||
* Returns an object containing a Subrs array and a CharStrings |
||||
* array extracted from and eexec encrypted block of data |
||||
*/ |
||||
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) { |
||||
if (token !== '/') { |
||||
continue; |
||||
} |
||||
token = this.getToken(); |
||||
switch (token) { |
||||
case 'CharStrings': |
||||
// The number immediately following CharStrings must be greater or
|
||||
// equal to the number of CharStrings.
|
||||
this.getToken(); |
||||
this.getToken(); // read in 'dict'
|
||||
this.getToken(); // read in 'dup'
|
||||
this.getToken(); // read in 'begin'
|
||||
while(true) { |
||||
token = this.getToken(); |
||||
if (token === null || token === 'end') { |
||||
break; |
||||
} |
||||
|
||||
if (token !== '/') { |
||||
continue; |
||||
} |
||||
var glyph = this.getToken(); |
||||
length = this.readInt(); |
||||
this.getToken(); // read in 'RD' or '-|'
|
||||
data = stream.makeSubStream(stream.pos, length); |
||||
lenIV = program.properties.privateData['lenIV']; |
||||
encoded = decrypt(data.getBytes(), CHAR_STRS_ENCRYPT_KEY, lenIV); |
||||
// Skip past the required space and binary data.
|
||||
stream.skip(length); |
||||
this.nextChar(); |
||||
token = this.getToken(); // read in 'ND' or '|-'
|
||||
if (token === 'noaccess') { |
||||
this.getToken(); // read in 'def'
|
||||
} |
||||
charstrings.push({ |
||||
glyph: glyph, |
||||
encoded: encoded |
||||
}); |
||||
} |
||||
break; |
||||
case 'Subrs': |
||||
var num = this.readInt(); |
||||
this.getToken(); // read in 'array'
|
||||
while ((token = this.getToken()) === 'dup') { |
||||
var index = this.readInt(); |
||||
length = this.readInt(); |
||||
this.getToken(); // read in 'RD' or '-|'
|
||||
data = stream.makeSubStream(stream.pos, length); |
||||
lenIV = program.properties.privateData['lenIV']; |
||||
encoded = decrypt(data.getBytes(), CHAR_STRS_ENCRYPT_KEY, lenIV); |
||||
// Skip past the required space and binary data.
|
||||
stream.skip(length); |
||||
this.nextChar(); |
||||
token = this.getToken(); // read in 'NP' or '|'
|
||||
if (token === 'noaccess') { |
||||
this.getToken(); // read in 'put'
|
||||
} |
||||
subrs[index] = encoded; |
||||
} |
||||
break; |
||||
case 'BlueValues': |
||||
case 'OtherBlues': |
||||
case 'FamilyBlues': |
||||
case 'FamilyOtherBlues': |
||||
var blueArray = this.readNumberArray(); |
||||
// *Blue* values may contain invalid data: disables reading of
|
||||
// those values when hinting is disabled.
|
||||
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; |
||||
if (error) { |
||||
// It seems when FreeType encounters an error while evaluating a glyph
|
||||
// that it completely ignores the glyph so we'll mimic that behaviour
|
||||
// here and put an endchar to make the validator happy.
|
||||
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; |
||||
if (!/^\d+$/.test(encodingArg)) { |
||||
// encoding name is specified
|
||||
encoding = getEncoding(encodingArg); |
||||
} else { |
||||
encoding = []; |
||||
var size = parseInt(encodingArg, 10) | 0; |
||||
this.getToken(); // read in 'array'
|
||||
|
||||
for (var j = 0; j < size; j++) { |
||||
token = this.getToken(); |
||||
// skipping till first dup or def (e.g. ignoring for statement)
|
||||
while (token !== 'dup' && token !== 'def') { |
||||
token = this.getToken(); |
||||
if (token === null) { |
||||
return; // invalid header
|
||||
} |
||||
} |
||||
if (token === 'def') { |
||||
break; // read all array data
|
||||
} |
||||
var index = this.readInt(); |
||||
this.getToken(); // read in '/'
|
||||
var glyph = this.getToken(); |
||||
encoding[index] = glyph; |
||||
this.getToken(); // read the in 'put'
|
||||
} |
||||
} |
||||
properties.builtInEncoding = encoding; |
||||
break; |
||||
case 'FontBBox': |
||||
var fontBBox = this.readNumberArray(); |
||||
// adjusting ascent/descent
|
||||
properties.ascent = fontBBox[3]; |
||||
properties.descent = fontBBox[1]; |
||||
properties.ascentScaled = true; |
||||
break; |
||||
} |
||||
} |
||||
} |
||||
}; |
||||
|
||||
return Type1Parser; |
||||
})(); |
||||
|
||||
exports.Type1Parser = Type1Parser; |
||||
})); |
||||
Loading…
Reference in new issue