mirror of
https://github.com/mozilla/gecko-dev.git
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2293 lines
83 KiB
C++
2293 lines
83 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifdef MOZ_LOGGING
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#define FORCE_PR_LOG /* Allow logging in the release build */
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#endif
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#include "prlog.h"
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#include "mozilla/Util.h"
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#include "gfxFontUtils.h"
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#include "nsServiceManagerUtils.h"
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#include "mozilla/Preferences.h"
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#include "nsIStreamBufferAccess.h"
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#include "nsIUUIDGenerator.h"
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#include "nsMemory.h"
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#include "nsICharsetConverterManager.h"
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#include "plbase64.h"
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#include "prlog.h"
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#include "woff.h"
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#ifdef XP_MACOSX
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#include <CoreFoundation/CoreFoundation.h>
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#endif
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#ifdef PR_LOGGING
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#define LOG(log, args) PR_LOG(gfxPlatform::GetLog(log), \
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PR_LOG_DEBUG, args)
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#endif // PR_LOGGING
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#define NO_RANGE_FOUND 126 // bit 126 in the font unicode ranges is required to be 0
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#define UNICODE_BMP_LIMIT 0x10000
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using namespace mozilla;
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/* Unicode subrange table
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* from: http://msdn.microsoft.com/en-us/library/dd374090
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*
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* Edit the text to extend the initial digit, then use something like:
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* perl -pi -e 's/^(\d+)\t([\dA-Fa-f]+)\s+-\s+([\dA-Fa-f]+)\s+\b([a-zA-Z0-9\(\)\- ]+)/ { \1, 0x\2, 0x\3, \"\4\" },/' < unicoderange.txt
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* to generate the below list.
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*/
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struct UnicodeRangeTableEntry
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{
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uint8_t bit;
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uint32_t start;
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uint32_t end;
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const char *info;
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};
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static struct UnicodeRangeTableEntry gUnicodeRanges[] = {
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{ 0, 0x0000, 0x007F, "Basic Latin" },
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{ 1, 0x0080, 0x00FF, "Latin-1 Supplement" },
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{ 2, 0x0100, 0x017F, "Latin Extended-A" },
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{ 3, 0x0180, 0x024F, "Latin Extended-B" },
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{ 4, 0x0250, 0x02AF, "IPA Extensions" },
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{ 4, 0x1D00, 0x1D7F, "Phonetic Extensions" },
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{ 4, 0x1D80, 0x1DBF, "Phonetic Extensions Supplement" },
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{ 5, 0x02B0, 0x02FF, "Spacing Modifier Letters" },
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{ 5, 0xA700, 0xA71F, "Modifier Tone Letters" },
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{ 6, 0x0300, 0x036F, "Combining Diacritical Marks" },
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{ 6, 0x1DC0, 0x1DFF, "Combining Diacritical Marks Supplement" },
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{ 7, 0x0370, 0x03FF, "Greek and Coptic" },
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{ 8, 0x2C80, 0x2CFF, "Coptic" },
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{ 9, 0x0400, 0x04FF, "Cyrillic" },
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{ 9, 0x0500, 0x052F, "Cyrillic Supplement" },
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{ 9, 0x2DE0, 0x2DFF, "Cyrillic Extended-A" },
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{ 9, 0xA640, 0xA69F, "Cyrillic Extended-B" },
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{ 10, 0x0530, 0x058F, "Armenian" },
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{ 11, 0x0590, 0x05FF, "Hebrew" },
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{ 12, 0xA500, 0xA63F, "Vai" },
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{ 13, 0x0600, 0x06FF, "Arabic" },
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{ 13, 0x0750, 0x077F, "Arabic Supplement" },
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{ 14, 0x07C0, 0x07FF, "NKo" },
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{ 15, 0x0900, 0x097F, "Devanagari" },
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{ 16, 0x0980, 0x09FF, "Bengali" },
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{ 17, 0x0A00, 0x0A7F, "Gurmukhi" },
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{ 18, 0x0A80, 0x0AFF, "Gujarati" },
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{ 19, 0x0B00, 0x0B7F, "Oriya" },
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{ 20, 0x0B80, 0x0BFF, "Tamil" },
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{ 21, 0x0C00, 0x0C7F, "Telugu" },
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{ 22, 0x0C80, 0x0CFF, "Kannada" },
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{ 23, 0x0D00, 0x0D7F, "Malayalam" },
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{ 24, 0x0E00, 0x0E7F, "Thai" },
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{ 25, 0x0E80, 0x0EFF, "Lao" },
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{ 26, 0x10A0, 0x10FF, "Georgian" },
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{ 26, 0x2D00, 0x2D2F, "Georgian Supplement" },
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{ 27, 0x1B00, 0x1B7F, "Balinese" },
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{ 28, 0x1100, 0x11FF, "Hangul Jamo" },
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{ 29, 0x1E00, 0x1EFF, "Latin Extended Additional" },
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{ 29, 0x2C60, 0x2C7F, "Latin Extended-C" },
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{ 29, 0xA720, 0xA7FF, "Latin Extended-D" },
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{ 30, 0x1F00, 0x1FFF, "Greek Extended" },
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{ 31, 0x2000, 0x206F, "General Punctuation" },
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{ 31, 0x2E00, 0x2E7F, "Supplemental Punctuation" },
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{ 32, 0x2070, 0x209F, "Superscripts And Subscripts" },
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{ 33, 0x20A0, 0x20CF, "Currency Symbols" },
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{ 34, 0x20D0, 0x20FF, "Combining Diacritical Marks For Symbols" },
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{ 35, 0x2100, 0x214F, "Letterlike Symbols" },
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{ 36, 0x2150, 0x218F, "Number Forms" },
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{ 37, 0x2190, 0x21FF, "Arrows" },
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{ 37, 0x27F0, 0x27FF, "Supplemental Arrows-A" },
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{ 37, 0x2900, 0x297F, "Supplemental Arrows-B" },
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{ 37, 0x2B00, 0x2BFF, "Miscellaneous Symbols and Arrows" },
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{ 38, 0x2200, 0x22FF, "Mathematical Operators" },
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{ 38, 0x27C0, 0x27EF, "Miscellaneous Mathematical Symbols-A" },
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{ 38, 0x2980, 0x29FF, "Miscellaneous Mathematical Symbols-B" },
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{ 38, 0x2A00, 0x2AFF, "Supplemental Mathematical Operators" },
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{ 39, 0x2300, 0x23FF, "Miscellaneous Technical" },
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{ 40, 0x2400, 0x243F, "Control Pictures" },
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{ 41, 0x2440, 0x245F, "Optical Character Recognition" },
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{ 42, 0x2460, 0x24FF, "Enclosed Alphanumerics" },
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{ 43, 0x2500, 0x257F, "Box Drawing" },
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{ 44, 0x2580, 0x259F, "Block Elements" },
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{ 45, 0x25A0, 0x25FF, "Geometric Shapes" },
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{ 46, 0x2600, 0x26FF, "Miscellaneous Symbols" },
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{ 47, 0x2700, 0x27BF, "Dingbats" },
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{ 48, 0x3000, 0x303F, "CJK Symbols And Punctuation" },
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{ 49, 0x3040, 0x309F, "Hiragana" },
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{ 50, 0x30A0, 0x30FF, "Katakana" },
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{ 50, 0x31F0, 0x31FF, "Katakana Phonetic Extensions" },
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{ 51, 0x3100, 0x312F, "Bopomofo" },
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{ 50, 0x31A0, 0x31BF, "Bopomofo Extended" },
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{ 52, 0x3130, 0x318F, "Hangul Compatibility Jamo" },
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{ 53, 0xA840, 0xA87F, "Phags-pa" },
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{ 54, 0x3200, 0x32FF, "Enclosed CJK Letters And Months" },
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{ 55, 0x3300, 0x33FF, "CJK Compatibility" },
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{ 56, 0xAC00, 0xD7AF, "Hangul Syllables" },
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{ 57, 0xD800, 0xDFFF, "Non-Plane 0" },
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{ 58, 0x10900, 0x1091F, "Phoenician" },
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{ 59, 0x2E80, 0x2EFF, "CJK Radicals Supplement" },
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{ 59, 0x2F00, 0x2FDF, "Kangxi Radicals" },
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{ 59, 0x2FF0, 0x2FFF, "Ideographic Description Characters" },
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{ 59, 0x3190, 0x319F, "Kanbun" },
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{ 59, 0x3400, 0x4DBF, "CJK Unified Ideographs Extension A" },
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{ 59, 0x4E00, 0x9FFF, "CJK Unified Ideographs" },
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{ 59, 0x20000, 0x2A6DF, "CJK Unified Ideographs Extension B" },
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{ 60, 0xE000, 0xF8FF, "Private Use Area" },
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{ 61, 0x31C0, 0x31EF, "CJK Strokes" },
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{ 61, 0xF900, 0xFAFF, "CJK Compatibility Ideographs" },
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{ 61, 0x2F800, 0x2FA1F, "CJK Compatibility Ideographs Supplement" },
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{ 62, 0xFB00, 0xFB4F, "Alphabetic Presentation Forms" },
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{ 63, 0xFB50, 0xFDFF, "Arabic Presentation Forms-A" },
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{ 64, 0xFE20, 0xFE2F, "Combining Half Marks" },
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{ 65, 0xFE10, 0xFE1F, "Vertical Forms" },
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{ 65, 0xFE30, 0xFE4F, "CJK Compatibility Forms" },
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{ 66, 0xFE50, 0xFE6F, "Small Form Variants" },
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{ 67, 0xFE70, 0xFEFF, "Arabic Presentation Forms-B" },
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{ 68, 0xFF00, 0xFFEF, "Halfwidth And Fullwidth Forms" },
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{ 69, 0xFFF0, 0xFFFF, "Specials" },
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{ 70, 0x0F00, 0x0FFF, "Tibetan" },
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{ 71, 0x0700, 0x074F, "Syriac" },
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{ 72, 0x0780, 0x07BF, "Thaana" },
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{ 73, 0x0D80, 0x0DFF, "Sinhala" },
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{ 74, 0x1000, 0x109F, "Myanmar" },
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{ 75, 0x1200, 0x137F, "Ethiopic" },
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{ 75, 0x1380, 0x139F, "Ethiopic Supplement" },
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{ 75, 0x2D80, 0x2DDF, "Ethiopic Extended" },
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{ 76, 0x13A0, 0x13FF, "Cherokee" },
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{ 77, 0x1400, 0x167F, "Unified Canadian Aboriginal Syllabics" },
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{ 78, 0x1680, 0x169F, "Ogham" },
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{ 79, 0x16A0, 0x16FF, "Runic" },
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{ 80, 0x1780, 0x17FF, "Khmer" },
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{ 80, 0x19E0, 0x19FF, "Khmer Symbols" },
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{ 81, 0x1800, 0x18AF, "Mongolian" },
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{ 82, 0x2800, 0x28FF, "Braille Patterns" },
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{ 83, 0xA000, 0xA48F, "Yi Syllables" },
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{ 83, 0xA490, 0xA4CF, "Yi Radicals" },
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{ 84, 0x1700, 0x171F, "Tagalog" },
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{ 84, 0x1720, 0x173F, "Hanunoo" },
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{ 84, 0x1740, 0x175F, "Buhid" },
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{ 84, 0x1760, 0x177F, "Tagbanwa" },
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{ 85, 0x10300, 0x1032F, "Old Italic" },
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{ 86, 0x10330, 0x1034F, "Gothic" },
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{ 87, 0x10400, 0x1044F, "Deseret" },
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{ 88, 0x1D000, 0x1D0FF, "Byzantine Musical Symbols" },
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{ 88, 0x1D100, 0x1D1FF, "Musical Symbols" },
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{ 88, 0x1D200, 0x1D24F, "Ancient Greek Musical Notation" },
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{ 89, 0x1D400, 0x1D7FF, "Mathematical Alphanumeric Symbols" },
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{ 90, 0xFF000, 0xFFFFD, "Private Use (plane 15)" },
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{ 90, 0x100000, 0x10FFFD, "Private Use (plane 16)" },
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{ 91, 0xFE00, 0xFE0F, "Variation Selectors" },
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{ 91, 0xE0100, 0xE01EF, "Variation Selectors Supplement" },
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{ 92, 0xE0000, 0xE007F, "Tags" },
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{ 93, 0x1900, 0x194F, "Limbu" },
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{ 94, 0x1950, 0x197F, "Tai Le" },
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{ 95, 0x1980, 0x19DF, "New Tai Lue" },
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{ 96, 0x1A00, 0x1A1F, "Buginese" },
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{ 97, 0x2C00, 0x2C5F, "Glagolitic" },
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{ 98, 0x2D30, 0x2D7F, "Tifinagh" },
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{ 99, 0x4DC0, 0x4DFF, "Yijing Hexagram Symbols" },
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{ 100, 0xA800, 0xA82F, "Syloti Nagri" },
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{ 101, 0x10000, 0x1007F, "Linear B Syllabary" },
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{ 101, 0x10080, 0x100FF, "Linear B Ideograms" },
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{ 101, 0x10100, 0x1013F, "Aegean Numbers" },
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{ 102, 0x10140, 0x1018F, "Ancient Greek Numbers" },
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{ 103, 0x10380, 0x1039F, "Ugaritic" },
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{ 104, 0x103A0, 0x103DF, "Old Persian" },
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{ 105, 0x10450, 0x1047F, "Shavian" },
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{ 106, 0x10480, 0x104AF, "Osmanya" },
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{ 107, 0x10800, 0x1083F, "Cypriot Syllabary" },
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{ 108, 0x10A00, 0x10A5F, "Kharoshthi" },
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{ 109, 0x1D300, 0x1D35F, "Tai Xuan Jing Symbols" },
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{ 110, 0x12000, 0x123FF, "Cuneiform" },
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{ 110, 0x12400, 0x1247F, "Cuneiform Numbers and Punctuation" },
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{ 111, 0x1D360, 0x1D37F, "Counting Rod Numerals" },
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{ 112, 0x1B80, 0x1BBF, "Sundanese" },
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{ 113, 0x1C00, 0x1C4F, "Lepcha" },
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{ 114, 0x1C50, 0x1C7F, "Ol Chiki" },
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{ 115, 0xA880, 0xA8DF, "Saurashtra" },
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{ 116, 0xA900, 0xA92F, "Kayah Li" },
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{ 117, 0xA930, 0xA95F, "Rejang" },
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{ 118, 0xAA00, 0xAA5F, "Cham" },
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{ 119, 0x10190, 0x101CF, "Ancient Symbols" },
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{ 120, 0x101D0, 0x101FF, "Phaistos Disc" },
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{ 121, 0x10280, 0x1029F, "Lycian" },
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{ 121, 0x102A0, 0x102DF, "Carian" },
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{ 121, 0x10920, 0x1093F, "Lydian" },
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{ 122, 0x1F000, 0x1F02F, "Mahjong Tiles" },
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{ 122, 0x1F030, 0x1F09F, "Domino Tiles" }
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};
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#pragma pack(1)
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typedef struct {
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AutoSwap_PRUint16 format;
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AutoSwap_PRUint16 reserved;
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AutoSwap_PRUint32 length;
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AutoSwap_PRUint32 language;
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AutoSwap_PRUint32 numGroups;
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} Format12CmapHeader;
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typedef struct {
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AutoSwap_PRUint32 startCharCode;
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AutoSwap_PRUint32 endCharCode;
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AutoSwap_PRUint32 startGlyphId;
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} Format12Group;
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#pragma pack()
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#if PR_LOGGING
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void
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gfxSparseBitSet::Dump(const char* aPrefix, eGfxLog aWhichLog) const
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{
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NS_ASSERTION(mBlocks.DebugGetHeader(), "mHdr is null, this is bad");
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uint32_t b, numBlocks = mBlocks.Length();
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for (b = 0; b < numBlocks; b++) {
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Block *block = mBlocks[b];
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if (!block) continue;
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char outStr[256];
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int index = 0;
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index += sprintf(&outStr[index], "%s u+%6.6x [", aPrefix, (b << BLOCK_INDEX_SHIFT));
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for (int i = 0; i < 32; i += 4) {
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for (int j = i; j < i + 4; j++) {
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uint8_t bits = block->mBits[j];
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uint8_t flip1 = ((bits & 0xaa) >> 1) | ((bits & 0x55) << 1);
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uint8_t flip2 = ((flip1 & 0xcc) >> 2) | ((flip1 & 0x33) << 2);
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uint8_t flipped = ((flip2 & 0xf0) >> 4) | ((flip2 & 0x0f) << 4);
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index += sprintf(&outStr[index], "%2.2x", flipped);
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}
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if (i + 4 != 32) index += sprintf(&outStr[index], " ");
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}
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index += sprintf(&outStr[index], "]");
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LOG(aWhichLog, ("%s", outStr));
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}
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}
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#endif
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nsresult
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gfxFontUtils::ReadCMAPTableFormat12(const uint8_t *aBuf, uint32_t aLength,
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gfxSparseBitSet& aCharacterMap)
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{
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// Ensure table is large enough that we can safely read the header
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NS_ENSURE_TRUE(aLength >= sizeof(Format12CmapHeader),
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NS_ERROR_GFX_CMAP_MALFORMED);
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// Sanity-check header fields
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const Format12CmapHeader *cmap12 =
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reinterpret_cast<const Format12CmapHeader*>(aBuf);
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NS_ENSURE_TRUE(uint16_t(cmap12->format) == 12,
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NS_ERROR_GFX_CMAP_MALFORMED);
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NS_ENSURE_TRUE(uint16_t(cmap12->reserved) == 0,
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NS_ERROR_GFX_CMAP_MALFORMED);
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uint32_t tablelen = cmap12->length;
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NS_ENSURE_TRUE(tablelen >= sizeof(Format12CmapHeader) &&
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tablelen <= aLength, NS_ERROR_GFX_CMAP_MALFORMED);
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NS_ENSURE_TRUE(cmap12->language == 0, NS_ERROR_GFX_CMAP_MALFORMED);
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// Check that the table is large enough for the group array
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const uint32_t numGroups = cmap12->numGroups;
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NS_ENSURE_TRUE((tablelen - sizeof(Format12CmapHeader)) /
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sizeof(Format12Group) >= numGroups,
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NS_ERROR_GFX_CMAP_MALFORMED);
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// The array of groups immediately follows the subtable header.
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const Format12Group *group =
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reinterpret_cast<const Format12Group*>(aBuf + sizeof(Format12CmapHeader));
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// Check that groups are in correct order and do not overlap,
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// and record character coverage in aCharacterMap.
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uint32_t prevEndCharCode = 0;
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for (uint32_t i = 0; i < numGroups; i++, group++) {
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const uint32_t startCharCode = group->startCharCode;
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const uint32_t endCharCode = group->endCharCode;
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NS_ENSURE_TRUE((prevEndCharCode < startCharCode || i == 0) &&
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startCharCode <= endCharCode &&
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endCharCode <= CMAP_MAX_CODEPOINT,
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NS_ERROR_GFX_CMAP_MALFORMED);
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aCharacterMap.SetRange(startCharCode, endCharCode);
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prevEndCharCode = endCharCode;
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}
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aCharacterMap.Compact();
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return NS_OK;
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}
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nsresult
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gfxFontUtils::ReadCMAPTableFormat4(const uint8_t *aBuf, uint32_t aLength,
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gfxSparseBitSet& aCharacterMap)
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{
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enum {
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OffsetFormat = 0,
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OffsetLength = 2,
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OffsetLanguage = 4,
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OffsetSegCountX2 = 6
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};
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NS_ENSURE_TRUE(ReadShortAt(aBuf, OffsetFormat) == 4,
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NS_ERROR_GFX_CMAP_MALFORMED);
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uint16_t tablelen = ReadShortAt(aBuf, OffsetLength);
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NS_ENSURE_TRUE(tablelen <= aLength, NS_ERROR_GFX_CMAP_MALFORMED);
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NS_ENSURE_TRUE(tablelen > 16, NS_ERROR_GFX_CMAP_MALFORMED);
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// This field should normally (except for Mac platform subtables) be zero according to
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// the OT spec, but some buggy fonts have lang = 1 (which would be English for MacOS).
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// E.g. Arial Narrow Bold, v. 1.1 (Tiger), Arial Unicode MS (see bug 530614).
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// So accept either zero or one here; the error should be harmless.
|
|
NS_ENSURE_TRUE((ReadShortAt(aBuf, OffsetLanguage) & 0xfffe) == 0,
|
|
NS_ERROR_GFX_CMAP_MALFORMED);
|
|
|
|
uint16_t segCountX2 = ReadShortAt(aBuf, OffsetSegCountX2);
|
|
NS_ENSURE_TRUE(tablelen >= 16 + (segCountX2 * 4),
|
|
NS_ERROR_GFX_CMAP_MALFORMED);
|
|
|
|
const uint16_t segCount = segCountX2 / 2;
|
|
|
|
const uint16_t *endCounts = reinterpret_cast<const uint16_t*>(aBuf + 14);
|
|
const uint16_t *startCounts = endCounts + 1 /* skip one uint16_t for reservedPad */ + segCount;
|
|
const uint16_t *idDeltas = startCounts + segCount;
|
|
const uint16_t *idRangeOffsets = idDeltas + segCount;
|
|
uint16_t prevEndCount = 0;
|
|
for (uint16_t i = 0; i < segCount; i++) {
|
|
const uint16_t endCount = ReadShortAt16(endCounts, i);
|
|
const uint16_t startCount = ReadShortAt16(startCounts, i);
|
|
const uint16_t idRangeOffset = ReadShortAt16(idRangeOffsets, i);
|
|
|
|
// sanity-check range
|
|
// This permits ranges to overlap by 1 character, which is strictly
|
|
// incorrect but occurs in Baskerville on OS X 10.7 (see bug 689087),
|
|
// and appears to be harmless in practice
|
|
NS_ENSURE_TRUE(startCount >= prevEndCount && startCount <= endCount,
|
|
NS_ERROR_GFX_CMAP_MALFORMED);
|
|
prevEndCount = endCount;
|
|
|
|
if (idRangeOffset == 0) {
|
|
aCharacterMap.SetRange(startCount, endCount);
|
|
} else {
|
|
// const uint16_t idDelta = ReadShortAt16(idDeltas, i); // Unused: self-documenting.
|
|
for (uint32_t c = startCount; c <= endCount; ++c) {
|
|
if (c == 0xFFFF)
|
|
break;
|
|
|
|
const uint16_t *gdata = (idRangeOffset/2
|
|
+ (c - startCount)
|
|
+ &idRangeOffsets[i]);
|
|
|
|
NS_ENSURE_TRUE((uint8_t*)gdata > aBuf &&
|
|
(uint8_t*)gdata < aBuf + aLength,
|
|
NS_ERROR_GFX_CMAP_MALFORMED);
|
|
|
|
// make sure we have a glyph
|
|
if (*gdata != 0) {
|
|
// The glyph index at this point is:
|
|
// glyph = (ReadShortAt16(idDeltas, i) + *gdata) % 65536;
|
|
|
|
aCharacterMap.set(c);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
aCharacterMap.Compact();
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
gfxFontUtils::ReadCMAPTableFormat14(const uint8_t *aBuf, uint32_t aLength,
|
|
uint8_t*& aTable)
|
|
{
|
|
enum {
|
|
OffsetFormat = 0,
|
|
OffsetTableLength = 2,
|
|
OffsetNumVarSelectorRecords = 6,
|
|
OffsetVarSelectorRecords = 10,
|
|
|
|
SizeOfVarSelectorRecord = 11,
|
|
VSRecOffsetVarSelector = 0,
|
|
VSRecOffsetDefUVSOffset = 3,
|
|
VSRecOffsetNonDefUVSOffset = 7,
|
|
|
|
SizeOfDefUVSTable = 4,
|
|
DefUVSOffsetStartUnicodeValue = 0,
|
|
DefUVSOffsetAdditionalCount = 3,
|
|
|
|
SizeOfNonDefUVSTable = 5,
|
|
NonDefUVSOffsetUnicodeValue = 0,
|
|
NonDefUVSOffsetGlyphID = 3
|
|
};
|
|
NS_ENSURE_TRUE(aLength >= OffsetVarSelectorRecords,
|
|
NS_ERROR_GFX_CMAP_MALFORMED);
|
|
|
|
NS_ENSURE_TRUE(ReadShortAt(aBuf, OffsetFormat) == 14,
|
|
NS_ERROR_GFX_CMAP_MALFORMED);
|
|
|
|
uint32_t tablelen = ReadLongAt(aBuf, OffsetTableLength);
|
|
NS_ENSURE_TRUE(tablelen <= aLength, NS_ERROR_GFX_CMAP_MALFORMED);
|
|
NS_ENSURE_TRUE(tablelen >= OffsetVarSelectorRecords,
|
|
NS_ERROR_GFX_CMAP_MALFORMED);
|
|
|
|
const uint32_t numVarSelectorRecords = ReadLongAt(aBuf, OffsetNumVarSelectorRecords);
|
|
NS_ENSURE_TRUE((tablelen - OffsetVarSelectorRecords) /
|
|
SizeOfVarSelectorRecord >= numVarSelectorRecords,
|
|
NS_ERROR_GFX_CMAP_MALFORMED);
|
|
|
|
const uint8_t *records = aBuf + OffsetVarSelectorRecords;
|
|
for (uint32_t i = 0; i < numVarSelectorRecords;
|
|
i++, records += SizeOfVarSelectorRecord) {
|
|
const uint32_t varSelector = ReadUint24At(records, VSRecOffsetVarSelector);
|
|
const uint32_t defUVSOffset = ReadLongAt(records, VSRecOffsetDefUVSOffset);
|
|
const uint32_t nonDefUVSOffset = ReadLongAt(records, VSRecOffsetNonDefUVSOffset);
|
|
NS_ENSURE_TRUE(varSelector <= CMAP_MAX_CODEPOINT &&
|
|
defUVSOffset <= tablelen - 4 &&
|
|
nonDefUVSOffset <= tablelen - 4,
|
|
NS_ERROR_GFX_CMAP_MALFORMED);
|
|
|
|
if (defUVSOffset) {
|
|
const uint32_t numUnicodeValueRanges = ReadLongAt(aBuf, defUVSOffset);
|
|
NS_ENSURE_TRUE((tablelen - defUVSOffset) /
|
|
SizeOfDefUVSTable >= numUnicodeValueRanges,
|
|
NS_ERROR_GFX_CMAP_MALFORMED);
|
|
const uint8_t *tables = aBuf + defUVSOffset + 4;
|
|
uint32_t prevEndUnicode = 0;
|
|
for (uint32_t j = 0; j < numUnicodeValueRanges; j++, tables += SizeOfDefUVSTable) {
|
|
const uint32_t startUnicode = ReadUint24At(tables, DefUVSOffsetStartUnicodeValue);
|
|
const uint32_t endUnicode = startUnicode + tables[DefUVSOffsetAdditionalCount];
|
|
NS_ENSURE_TRUE((prevEndUnicode < startUnicode || j == 0) &&
|
|
endUnicode <= CMAP_MAX_CODEPOINT,
|
|
NS_ERROR_GFX_CMAP_MALFORMED);
|
|
prevEndUnicode = endUnicode;
|
|
}
|
|
}
|
|
|
|
if (nonDefUVSOffset) {
|
|
const uint32_t numUVSMappings = ReadLongAt(aBuf, nonDefUVSOffset);
|
|
NS_ENSURE_TRUE((tablelen - nonDefUVSOffset) /
|
|
SizeOfNonDefUVSTable >= numUVSMappings,
|
|
NS_ERROR_GFX_CMAP_MALFORMED);
|
|
const uint8_t *tables = aBuf + nonDefUVSOffset + 4;
|
|
uint32_t prevUnicode = 0;
|
|
for (uint32_t j = 0; j < numUVSMappings; j++, tables += SizeOfNonDefUVSTable) {
|
|
const uint32_t unicodeValue = ReadUint24At(tables, NonDefUVSOffsetUnicodeValue);
|
|
NS_ENSURE_TRUE((prevUnicode < unicodeValue || j == 0) &&
|
|
unicodeValue <= CMAP_MAX_CODEPOINT,
|
|
NS_ERROR_GFX_CMAP_MALFORMED);
|
|
prevUnicode = unicodeValue;
|
|
}
|
|
}
|
|
}
|
|
|
|
aTable = new uint8_t[tablelen];
|
|
memcpy(aTable, aBuf, tablelen);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
// Windows requires fonts to have a format-4 cmap with a Microsoft ID (3). On the Mac, fonts either have
|
|
// a format-4 cmap with Microsoft platform/encoding id or they have one with a platformID == Unicode (0)
|
|
// For fonts with two format-4 tables, the first one (Unicode platform) is preferred on the Mac.
|
|
|
|
#if defined(XP_MACOSX)
|
|
#define acceptableFormat4(p,e,k) (((p) == PLATFORM_ID_MICROSOFT && (e) == EncodingIDMicrosoft && !(k)) || \
|
|
((p) == PLATFORM_ID_UNICODE))
|
|
|
|
#define acceptableUCS4Encoding(p, e, k) \
|
|
(((p) == PLATFORM_ID_MICROSOFT && (e) == EncodingIDUCS4ForMicrosoftPlatform) && (k) != 12 || \
|
|
((p) == PLATFORM_ID_UNICODE && \
|
|
((e) == EncodingIDDefaultForUnicodePlatform || (e) >= EncodingIDUCS4ForUnicodePlatform)))
|
|
#else
|
|
#define acceptableFormat4(p,e,k) ((p) == PLATFORM_ID_MICROSOFT && (e) == EncodingIDMicrosoft)
|
|
|
|
#define acceptableUCS4Encoding(p, e, k) \
|
|
((p) == PLATFORM_ID_MICROSOFT && (e) == EncodingIDUCS4ForMicrosoftPlatform)
|
|
#endif
|
|
|
|
#define acceptablePlatform(p) ((p) == PLATFORM_ID_UNICODE || (p) == PLATFORM_ID_MICROSOFT)
|
|
#define isSymbol(p,e) ((p) == PLATFORM_ID_MICROSOFT && (e) == EncodingIDSymbol)
|
|
#define isUVSEncoding(p, e) ((p) == PLATFORM_ID_UNICODE && (e) == EncodingIDUVSForUnicodePlatform)
|
|
|
|
uint32_t
|
|
gfxFontUtils::FindPreferredSubtable(const uint8_t *aBuf, uint32_t aBufLength,
|
|
uint32_t *aTableOffset,
|
|
uint32_t *aUVSTableOffset,
|
|
bool *aSymbolEncoding)
|
|
{
|
|
enum {
|
|
OffsetVersion = 0,
|
|
OffsetNumTables = 2,
|
|
SizeOfHeader = 4,
|
|
|
|
TableOffsetPlatformID = 0,
|
|
TableOffsetEncodingID = 2,
|
|
TableOffsetOffset = 4,
|
|
SizeOfTable = 8,
|
|
|
|
SubtableOffsetFormat = 0
|
|
};
|
|
enum {
|
|
EncodingIDSymbol = 0,
|
|
EncodingIDMicrosoft = 1,
|
|
EncodingIDDefaultForUnicodePlatform = 0,
|
|
EncodingIDUCS4ForUnicodePlatform = 3,
|
|
EncodingIDUVSForUnicodePlatform = 5,
|
|
EncodingIDUCS4ForMicrosoftPlatform = 10
|
|
};
|
|
|
|
if (aUVSTableOffset) {
|
|
*aUVSTableOffset = 0;
|
|
}
|
|
|
|
if (!aBuf || aBufLength < SizeOfHeader) {
|
|
// cmap table is missing, or too small to contain header fields!
|
|
return 0;
|
|
}
|
|
|
|
// uint16_t version = ReadShortAt(aBuf, OffsetVersion); // Unused: self-documenting.
|
|
uint16_t numTables = ReadShortAt(aBuf, OffsetNumTables);
|
|
if (aBufLength < uint32_t(SizeOfHeader + numTables * SizeOfTable)) {
|
|
return 0;
|
|
}
|
|
|
|
// save the format we want here
|
|
uint32_t keepFormat = 0;
|
|
|
|
const uint8_t *table = aBuf + SizeOfHeader;
|
|
for (uint16_t i = 0; i < numTables; ++i, table += SizeOfTable) {
|
|
const uint16_t platformID = ReadShortAt(table, TableOffsetPlatformID);
|
|
if (!acceptablePlatform(platformID))
|
|
continue;
|
|
|
|
const uint16_t encodingID = ReadShortAt(table, TableOffsetEncodingID);
|
|
const uint32_t offset = ReadLongAt(table, TableOffsetOffset);
|
|
if (aBufLength - 2 < offset) {
|
|
// this subtable is not valid - beyond end of buffer
|
|
return 0;
|
|
}
|
|
|
|
const uint8_t *subtable = aBuf + offset;
|
|
const uint16_t format = ReadShortAt(subtable, SubtableOffsetFormat);
|
|
|
|
if (isSymbol(platformID, encodingID)) {
|
|
keepFormat = format;
|
|
*aTableOffset = offset;
|
|
*aSymbolEncoding = true;
|
|
break;
|
|
} else if (format == 4 && acceptableFormat4(platformID, encodingID, keepFormat)) {
|
|
keepFormat = format;
|
|
*aTableOffset = offset;
|
|
*aSymbolEncoding = false;
|
|
} else if (format == 12 && acceptableUCS4Encoding(platformID, encodingID, keepFormat)) {
|
|
keepFormat = format;
|
|
*aTableOffset = offset;
|
|
*aSymbolEncoding = false;
|
|
if (platformID > PLATFORM_ID_UNICODE || !aUVSTableOffset || *aUVSTableOffset) {
|
|
break; // we don't want to try anything else when this format is available.
|
|
}
|
|
} else if (format == 14 && isUVSEncoding(platformID, encodingID) && aUVSTableOffset) {
|
|
*aUVSTableOffset = offset;
|
|
if (keepFormat == 12) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return keepFormat;
|
|
}
|
|
|
|
nsresult
|
|
gfxFontUtils::ReadCMAP(const uint8_t *aBuf, uint32_t aBufLength,
|
|
gfxSparseBitSet& aCharacterMap,
|
|
uint32_t& aUVSOffset,
|
|
bool& aUnicodeFont, bool& aSymbolFont)
|
|
{
|
|
uint32_t offset;
|
|
bool symbol;
|
|
uint32_t format = FindPreferredSubtable(aBuf, aBufLength,
|
|
&offset, &aUVSOffset, &symbol);
|
|
|
|
if (format == 4) {
|
|
if (symbol) {
|
|
aUnicodeFont = false;
|
|
aSymbolFont = true;
|
|
} else {
|
|
aUnicodeFont = true;
|
|
aSymbolFont = false;
|
|
}
|
|
return ReadCMAPTableFormat4(aBuf + offset, aBufLength - offset,
|
|
aCharacterMap);
|
|
}
|
|
|
|
if (format == 12) {
|
|
aUnicodeFont = true;
|
|
aSymbolFont = false;
|
|
return ReadCMAPTableFormat12(aBuf + offset, aBufLength - offset,
|
|
aCharacterMap);
|
|
}
|
|
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
#pragma pack(1)
|
|
|
|
typedef struct {
|
|
AutoSwap_PRUint16 format;
|
|
AutoSwap_PRUint16 length;
|
|
AutoSwap_PRUint16 language;
|
|
AutoSwap_PRUint16 segCountX2;
|
|
AutoSwap_PRUint16 searchRange;
|
|
AutoSwap_PRUint16 entrySelector;
|
|
AutoSwap_PRUint16 rangeShift;
|
|
|
|
AutoSwap_PRUint16 arrays[1];
|
|
} Format4Cmap;
|
|
|
|
typedef struct {
|
|
AutoSwap_PRUint16 format;
|
|
AutoSwap_PRUint32 length;
|
|
AutoSwap_PRUint32 numVarSelectorRecords;
|
|
|
|
typedef struct {
|
|
AutoSwap_PRUint24 varSelector;
|
|
AutoSwap_PRUint32 defaultUVSOffset;
|
|
AutoSwap_PRUint32 nonDefaultUVSOffset;
|
|
} VarSelectorRecord;
|
|
|
|
VarSelectorRecord varSelectorRecords[1];
|
|
} Format14Cmap;
|
|
|
|
typedef struct {
|
|
AutoSwap_PRUint32 numUVSMappings;
|
|
|
|
typedef struct {
|
|
AutoSwap_PRUint24 unicodeValue;
|
|
AutoSwap_PRUint16 glyphID;
|
|
} UVSMapping;
|
|
|
|
UVSMapping uvsMappings[1];
|
|
} NonDefUVSTable;
|
|
|
|
#pragma pack()
|
|
|
|
uint32_t
|
|
gfxFontUtils::MapCharToGlyphFormat4(const uint8_t *aBuf, PRUnichar aCh)
|
|
{
|
|
const Format4Cmap *cmap4 = reinterpret_cast<const Format4Cmap*>(aBuf);
|
|
uint16_t segCount;
|
|
const AutoSwap_PRUint16 *endCodes;
|
|
const AutoSwap_PRUint16 *startCodes;
|
|
const AutoSwap_PRUint16 *idDelta;
|
|
const AutoSwap_PRUint16 *idRangeOffset;
|
|
uint16_t probe;
|
|
uint16_t rangeShiftOver2;
|
|
uint16_t index;
|
|
|
|
segCount = (uint16_t)(cmap4->segCountX2) / 2;
|
|
|
|
endCodes = &cmap4->arrays[0];
|
|
startCodes = &cmap4->arrays[segCount + 1]; // +1 for reserved word between arrays
|
|
idDelta = &startCodes[segCount];
|
|
idRangeOffset = &idDelta[segCount];
|
|
|
|
probe = 1 << (uint16_t)(cmap4->entrySelector);
|
|
rangeShiftOver2 = (uint16_t)(cmap4->rangeShift) / 2;
|
|
|
|
if ((uint16_t)(startCodes[rangeShiftOver2]) <= aCh) {
|
|
index = rangeShiftOver2;
|
|
} else {
|
|
index = 0;
|
|
}
|
|
|
|
while (probe > 1) {
|
|
probe >>= 1;
|
|
if ((uint16_t)(startCodes[index + probe]) <= aCh) {
|
|
index += probe;
|
|
}
|
|
}
|
|
|
|
if (aCh >= (uint16_t)(startCodes[index]) && aCh <= (uint16_t)(endCodes[index])) {
|
|
uint16_t result;
|
|
if ((uint16_t)(idRangeOffset[index]) == 0) {
|
|
result = aCh;
|
|
} else {
|
|
uint16_t offset = aCh - (uint16_t)(startCodes[index]);
|
|
const AutoSwap_PRUint16 *glyphIndexTable =
|
|
(const AutoSwap_PRUint16*)((const char*)&idRangeOffset[index] +
|
|
(uint16_t)(idRangeOffset[index]));
|
|
result = glyphIndexTable[offset];
|
|
}
|
|
|
|
// note that this is unsigned 16-bit arithmetic, and may wrap around
|
|
result += (uint16_t)(idDelta[index]);
|
|
return result;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
uint32_t
|
|
gfxFontUtils::MapCharToGlyphFormat12(const uint8_t *aBuf, uint32_t aCh)
|
|
{
|
|
const Format12CmapHeader *cmap12 =
|
|
reinterpret_cast<const Format12CmapHeader*>(aBuf);
|
|
|
|
// We know that numGroups is within range for the subtable size
|
|
// because it was checked by ReadCMAPTableFormat12.
|
|
uint32_t numGroups = cmap12->numGroups;
|
|
|
|
// The array of groups immediately follows the subtable header.
|
|
const Format12Group *groups =
|
|
reinterpret_cast<const Format12Group*>(aBuf + sizeof(Format12CmapHeader));
|
|
|
|
// For most efficient binary search, we want to work on a range that
|
|
// is a power of 2 so that we can always halve it by shifting.
|
|
// So we find the largest power of 2 that is <= numGroups.
|
|
// We will offset this range by rangeOffset so as to reach the end
|
|
// of the table, provided that doesn't put us beyond the target
|
|
// value from the outset.
|
|
uint32_t powerOf2 = mozilla::FindHighestBit(numGroups);
|
|
uint32_t rangeOffset = numGroups - powerOf2;
|
|
uint32_t range = 0;
|
|
uint32_t startCharCode;
|
|
|
|
if (groups[rangeOffset].startCharCode <= aCh) {
|
|
range = rangeOffset;
|
|
}
|
|
|
|
// Repeatedly halve the size of the range until we find the target group
|
|
while (powerOf2 > 1) {
|
|
powerOf2 >>= 1;
|
|
if (groups[range + powerOf2].startCharCode <= aCh) {
|
|
range += powerOf2;
|
|
}
|
|
}
|
|
|
|
// Check if the character is actually present in the range and return
|
|
// the corresponding glyph ID
|
|
startCharCode = groups[range].startCharCode;
|
|
if (startCharCode <= aCh && groups[range].endCharCode >= aCh) {
|
|
return groups[range].startGlyphId + aCh - startCharCode;
|
|
}
|
|
|
|
// Else it's not present, so return the .notdef glyph
|
|
return 0;
|
|
}
|
|
|
|
uint16_t
|
|
gfxFontUtils::MapUVSToGlyphFormat14(const uint8_t *aBuf, uint32_t aCh, uint32_t aVS)
|
|
{
|
|
const Format14Cmap *cmap14 = reinterpret_cast<const Format14Cmap*>(aBuf);
|
|
|
|
// binary search in varSelectorRecords
|
|
uint32_t min = 0;
|
|
uint32_t max = cmap14->numVarSelectorRecords;
|
|
uint32_t nonDefUVSOffset = 0;
|
|
while (min < max) {
|
|
uint32_t index = (min + max) >> 1;
|
|
uint32_t varSelector = cmap14->varSelectorRecords[index].varSelector;
|
|
if (aVS == varSelector) {
|
|
nonDefUVSOffset = cmap14->varSelectorRecords[index].nonDefaultUVSOffset;
|
|
break;
|
|
}
|
|
if (aVS < varSelector) {
|
|
max = index;
|
|
} else {
|
|
min = index + 1;
|
|
}
|
|
}
|
|
if (!nonDefUVSOffset) {
|
|
return 0;
|
|
}
|
|
|
|
const NonDefUVSTable *table = reinterpret_cast<const NonDefUVSTable*>
|
|
(aBuf + nonDefUVSOffset);
|
|
|
|
// binary search in uvsMappings
|
|
min = 0;
|
|
max = table->numUVSMappings;
|
|
while (min < max) {
|
|
uint32_t index = (min + max) >> 1;
|
|
uint32_t unicodeValue = table->uvsMappings[index].unicodeValue;
|
|
if (aCh == unicodeValue) {
|
|
return table->uvsMappings[index].glyphID;
|
|
}
|
|
if (aCh < unicodeValue) {
|
|
max = index;
|
|
} else {
|
|
min = index + 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
uint32_t
|
|
gfxFontUtils::MapCharToGlyph(const uint8_t *aCmapBuf, uint32_t aBufLength,
|
|
uint32_t aUnicode, uint32_t aVarSelector)
|
|
{
|
|
uint32_t offset, uvsOffset;
|
|
bool symbol;
|
|
uint32_t format = FindPreferredSubtable(aCmapBuf, aBufLength, &offset,
|
|
&uvsOffset, &symbol);
|
|
|
|
uint32_t gid;
|
|
switch (format) {
|
|
case 4:
|
|
gid = aUnicode < UNICODE_BMP_LIMIT ?
|
|
MapCharToGlyphFormat4(aCmapBuf + offset, PRUnichar(aUnicode)) : 0;
|
|
break;
|
|
case 12:
|
|
gid = MapCharToGlyphFormat12(aCmapBuf + offset, aUnicode);
|
|
break;
|
|
default:
|
|
NS_WARNING("unsupported cmap format, glyphs will be missing");
|
|
gid = 0;
|
|
}
|
|
|
|
if (aVarSelector && uvsOffset && gid) {
|
|
uint32_t varGID =
|
|
gfxFontUtils::MapUVSToGlyphFormat14(aCmapBuf + uvsOffset,
|
|
aUnicode, aVarSelector);
|
|
if (varGID) {
|
|
gid = varGID;
|
|
}
|
|
// else the variation sequence was not supported, use default mapping
|
|
// of the character code alone
|
|
}
|
|
|
|
return gid;
|
|
}
|
|
|
|
uint8_t gfxFontUtils::CharRangeBit(uint32_t ch) {
|
|
const uint32_t n = sizeof(gUnicodeRanges) / sizeof(struct UnicodeRangeTableEntry);
|
|
|
|
for (uint32_t i = 0; i < n; ++i)
|
|
if (ch >= gUnicodeRanges[i].start && ch <= gUnicodeRanges[i].end)
|
|
return gUnicodeRanges[i].bit;
|
|
|
|
return NO_RANGE_FOUND;
|
|
}
|
|
|
|
void gfxFontUtils::GetPrefsFontList(const char *aPrefName, nsTArray<nsString>& aFontList)
|
|
{
|
|
const PRUnichar kComma = PRUnichar(',');
|
|
|
|
aFontList.Clear();
|
|
|
|
// get the list of single-face font families
|
|
nsAdoptingString fontlistValue = Preferences::GetString(aPrefName);
|
|
if (!fontlistValue) {
|
|
return;
|
|
}
|
|
|
|
// append each font name to the list
|
|
nsAutoString fontname;
|
|
const PRUnichar *p, *p_end;
|
|
fontlistValue.BeginReading(p);
|
|
fontlistValue.EndReading(p_end);
|
|
|
|
while (p < p_end) {
|
|
const PRUnichar *nameStart = p;
|
|
while (++p != p_end && *p != kComma)
|
|
/* nothing */ ;
|
|
|
|
// pull out a single name and clean out leading/trailing whitespace
|
|
fontname = Substring(nameStart, p);
|
|
fontname.CompressWhitespace(true, true);
|
|
|
|
// append it to the list
|
|
aFontList.AppendElement(fontname);
|
|
++p;
|
|
}
|
|
|
|
}
|
|
|
|
// produce a unique font name that is (1) a valid Postscript name and (2) less
|
|
// than 31 characters in length. Using AddFontMemResourceEx on Windows fails
|
|
// for names longer than 30 characters in length.
|
|
|
|
#define MAX_B64_LEN 32
|
|
|
|
nsresult gfxFontUtils::MakeUniqueUserFontName(nsAString& aName)
|
|
{
|
|
nsCOMPtr<nsIUUIDGenerator> uuidgen =
|
|
do_GetService("@mozilla.org/uuid-generator;1");
|
|
NS_ENSURE_TRUE(uuidgen, NS_ERROR_OUT_OF_MEMORY);
|
|
|
|
nsID guid;
|
|
|
|
NS_ASSERTION(sizeof(guid) * 2 <= MAX_B64_LEN, "size of nsID has changed!");
|
|
|
|
nsresult rv = uuidgen->GenerateUUIDInPlace(&guid);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
char guidB64[MAX_B64_LEN] = {0};
|
|
|
|
if (!PL_Base64Encode(reinterpret_cast<char*>(&guid), sizeof(guid), guidB64))
|
|
return NS_ERROR_FAILURE;
|
|
|
|
// all b64 characters except for '/' are allowed in Postscript names, so convert / ==> -
|
|
char *p;
|
|
for (p = guidB64; *p; p++) {
|
|
if (*p == '/')
|
|
*p = '-';
|
|
}
|
|
|
|
aName.Assign(NS_LITERAL_STRING("uf"));
|
|
aName.AppendASCII(guidB64);
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
// TrueType/OpenType table handling code
|
|
|
|
// need byte aligned structs
|
|
#pragma pack(1)
|
|
|
|
// name table stores set of name record structures, followed by
|
|
// large block containing all the strings. name record offset and length
|
|
// indicates the offset and length within that block.
|
|
// http://www.microsoft.com/typography/otspec/name.htm
|
|
struct NameRecordData {
|
|
uint32_t offset;
|
|
uint32_t length;
|
|
};
|
|
|
|
#pragma pack()
|
|
|
|
static bool
|
|
IsValidSFNTVersion(uint32_t version)
|
|
{
|
|
// normally 0x00010000, CFF-style OT fonts == 'OTTO' and Apple TT fonts = 'true'
|
|
// 'typ1' is also possible for old Type 1 fonts in a SFNT container but not supported
|
|
return version == 0x10000 ||
|
|
version == TRUETYPE_TAG('O','T','T','O') ||
|
|
version == TRUETYPE_TAG('t','r','u','e');
|
|
}
|
|
|
|
// copy and swap UTF-16 values, assume no surrogate pairs, can be in place
|
|
static void
|
|
CopySwapUTF16(const uint16_t *aInBuf, uint16_t *aOutBuf, uint32_t aLen)
|
|
{
|
|
const uint16_t *end = aInBuf + aLen;
|
|
while (aInBuf < end) {
|
|
uint16_t value = *aInBuf;
|
|
*aOutBuf = (value >> 8) | (value & 0xff) << 8;
|
|
aOutBuf++;
|
|
aInBuf++;
|
|
}
|
|
}
|
|
|
|
static bool
|
|
ValidateKernTable(const uint8_t *aKernTable, uint32_t aKernLength)
|
|
{
|
|
// -- kern table can cause crashes if invalid, so do some basic sanity-checking
|
|
const KernTableVersion0 *kernTable0 = reinterpret_cast<const KernTableVersion0*>(aKernTable);
|
|
if (aKernLength < sizeof(KernTableVersion0)) {
|
|
return false;
|
|
}
|
|
if (uint16_t(kernTable0->version) == 0) {
|
|
if (aKernLength < sizeof(KernTableVersion0) +
|
|
uint16_t(kernTable0->nTables) * sizeof(KernTableSubtableHeaderVersion0)) {
|
|
return false;
|
|
}
|
|
// at least the table is big enough to contain the subtable headers;
|
|
// we could go further and check the actual subtable sizes....
|
|
// for now, assume this is OK
|
|
return true;
|
|
}
|
|
|
|
const KernTableVersion1 *kernTable1 = reinterpret_cast<const KernTableVersion1*>(aKernTable);
|
|
if (aKernLength < sizeof(KernTableVersion1)) {
|
|
return false;
|
|
}
|
|
if (kernTable1->version == 0x00010000) {
|
|
if (aKernLength < sizeof(KernTableVersion1) +
|
|
kernTable1->nTables * sizeof(KernTableSubtableHeaderVersion1)) {
|
|
return false;
|
|
}
|
|
// at least the table is big enough to contain the subtable headers;
|
|
// we could go further and check the actual subtable sizes....
|
|
// for now, assume this is OK
|
|
return true;
|
|
}
|
|
|
|
// neither the old Windows version nor the newer Apple one; refuse to use it
|
|
return false;
|
|
}
|
|
|
|
static bool
|
|
ValidateLocaTable(const uint8_t* aLocaTable, uint32_t aLocaLen,
|
|
uint32_t aGlyfLen, int16_t aLocaFormat, uint16_t aNumGlyphs)
|
|
{
|
|
if (aLocaFormat == 0) {
|
|
if (aLocaLen < uint32_t(aNumGlyphs + 1) * sizeof(uint16_t)) {
|
|
return false;
|
|
}
|
|
const AutoSwap_PRUint16 *p =
|
|
reinterpret_cast<const AutoSwap_PRUint16*>(aLocaTable);
|
|
uint32_t prev = 0;
|
|
for (uint32_t i = 0; i <= aNumGlyphs; ++i) {
|
|
uint32_t current = uint16_t(*p++) * 2;
|
|
if (current < prev || current > aGlyfLen) {
|
|
return false;
|
|
}
|
|
prev = current;
|
|
}
|
|
return true;
|
|
}
|
|
if (aLocaFormat == 1) {
|
|
if (aLocaLen < (aNumGlyphs + 1) * sizeof(uint32_t)) {
|
|
return false;
|
|
}
|
|
const AutoSwap_PRUint32 *p =
|
|
reinterpret_cast<const AutoSwap_PRUint32*>(aLocaTable);
|
|
uint32_t prev = 0;
|
|
for (uint32_t i = 0; i <= aNumGlyphs; ++i) {
|
|
uint32_t current = *p++;
|
|
if (current < prev || current > aGlyfLen) {
|
|
return false;
|
|
}
|
|
prev = current;
|
|
}
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
gfxUserFontType
|
|
gfxFontUtils::DetermineFontDataType(const uint8_t *aFontData, uint32_t aFontDataLength)
|
|
{
|
|
// test for OpenType font data
|
|
// problem: EOT-Lite with 0x10000 length will look like TrueType!
|
|
if (aFontDataLength >= sizeof(SFNTHeader)) {
|
|
const SFNTHeader *sfntHeader = reinterpret_cast<const SFNTHeader*>(aFontData);
|
|
uint32_t sfntVersion = sfntHeader->sfntVersion;
|
|
if (IsValidSFNTVersion(sfntVersion)) {
|
|
return GFX_USERFONT_OPENTYPE;
|
|
}
|
|
}
|
|
|
|
// test for WOFF
|
|
if (aFontDataLength >= sizeof(AutoSwap_PRUint32)) {
|
|
const AutoSwap_PRUint32 *version =
|
|
reinterpret_cast<const AutoSwap_PRUint32*>(aFontData);
|
|
if (uint32_t(*version) == TRUETYPE_TAG('w','O','F','F')) {
|
|
return GFX_USERFONT_WOFF;
|
|
}
|
|
}
|
|
|
|
// tests for other formats here
|
|
|
|
return GFX_USERFONT_UNKNOWN;
|
|
}
|
|
|
|
bool
|
|
gfxFontUtils::ValidateSFNTHeaders(const uint8_t *aFontData,
|
|
uint32_t aFontDataLength)
|
|
{
|
|
NS_ASSERTION(aFontData, "null font data");
|
|
|
|
uint64_t dataLength(aFontDataLength);
|
|
|
|
// read in the sfnt header
|
|
if (sizeof(SFNTHeader) > aFontDataLength) {
|
|
NS_WARNING("invalid font (insufficient data)");
|
|
return false;
|
|
}
|
|
|
|
const SFNTHeader *sfntHeader = reinterpret_cast<const SFNTHeader*>(aFontData);
|
|
uint32_t sfntVersion = sfntHeader->sfntVersion;
|
|
if (!IsValidSFNTVersion(sfntVersion)) {
|
|
NS_WARNING("invalid font (SFNT version)");
|
|
return false;
|
|
}
|
|
|
|
// iterate through the table headers to find the head, name and OS/2 tables
|
|
#ifdef XP_WIN
|
|
bool foundOS2 = false;
|
|
#endif
|
|
bool foundHead = false, foundName = false;
|
|
bool foundGlyphs = false, foundCFF = false, foundKern = false;
|
|
bool foundLoca = false, foundMaxp = false;
|
|
uint32_t headOffset = 0, headLen, nameOffset = 0, kernOffset = 0,
|
|
kernLen = 0, glyfLen = 0, locaOffset = 0, locaLen = 0,
|
|
maxpOffset = 0, maxpLen;
|
|
uint32_t i, numTables;
|
|
|
|
numTables = sfntHeader->numTables;
|
|
uint32_t headerLen = sizeof(SFNTHeader) + sizeof(TableDirEntry) * numTables;
|
|
if (headerLen > aFontDataLength) {
|
|
NS_WARNING("invalid font (table directory)");
|
|
return false;
|
|
}
|
|
|
|
// table directory entries begin immediately following SFNT header
|
|
const TableDirEntry *dirEntry =
|
|
reinterpret_cast<const TableDirEntry*>(aFontData + sizeof(SFNTHeader));
|
|
uint32_t checksum = 0;
|
|
|
|
// checksum for font = (checksum of header) + (checksum of tables)
|
|
const AutoSwap_PRUint32 *headerData =
|
|
reinterpret_cast<const AutoSwap_PRUint32*>(aFontData);
|
|
|
|
// header length is in bytes, checksum calculated in longwords
|
|
for (i = 0; i < (headerLen >> 2); i++, headerData++) {
|
|
checksum += *headerData;
|
|
}
|
|
|
|
for (i = 0; i < numTables; i++, dirEntry++) {
|
|
|
|
// sanity check on offset, length values
|
|
if (uint64_t(dirEntry->offset) + uint64_t(dirEntry->length) > dataLength) {
|
|
NS_WARNING("invalid font (table directory entry)");
|
|
return false;
|
|
}
|
|
|
|
checksum += dirEntry->checkSum;
|
|
|
|
switch (dirEntry->tag) {
|
|
|
|
case TRUETYPE_TAG('h','e','a','d'):
|
|
foundHead = true;
|
|
headOffset = dirEntry->offset;
|
|
headLen = dirEntry->length;
|
|
if (headLen < sizeof(HeadTable)) {
|
|
NS_WARNING("invalid font (head table length)");
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case TRUETYPE_TAG('k','e','r','n'):
|
|
foundKern = true;
|
|
kernOffset = dirEntry->offset;
|
|
kernLen = dirEntry->length;
|
|
break;
|
|
|
|
case TRUETYPE_TAG('n','a','m','e'):
|
|
foundName = true;
|
|
nameOffset = dirEntry->offset;
|
|
break;
|
|
|
|
case TRUETYPE_TAG('O','S','/','2'):
|
|
#ifdef XP_WIN
|
|
foundOS2 = true;
|
|
#endif
|
|
break;
|
|
|
|
case TRUETYPE_TAG('g','l','y','f'): // TrueType-style quadratic glyph table
|
|
foundGlyphs = true;
|
|
glyfLen = dirEntry->length;
|
|
break;
|
|
|
|
case TRUETYPE_TAG('l','o','c','a'): // glyph location table
|
|
foundLoca = true;
|
|
locaOffset = dirEntry->offset;
|
|
locaLen = dirEntry->length;
|
|
break;
|
|
|
|
case TRUETYPE_TAG('m','a','x','p'): // max profile
|
|
foundMaxp = true;
|
|
maxpOffset = dirEntry->offset;
|
|
maxpLen = dirEntry->length;
|
|
if (maxpLen < sizeof(MaxpTableHeader)) {
|
|
NS_WARNING("invalid font (maxp table length)");
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case TRUETYPE_TAG('C','F','F',' '): // PS-style cubic glyph table
|
|
foundCFF = true;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
}
|
|
|
|
// simple sanity checks
|
|
|
|
// -- fonts need head, name, maxp tables
|
|
if (!foundHead || !foundName || !foundMaxp) {
|
|
NS_WARNING("invalid font (missing head/name/maxp table)");
|
|
return false;
|
|
}
|
|
|
|
// -- on Windows need OS/2 table
|
|
#ifdef XP_WIN
|
|
if (!foundOS2) {
|
|
NS_WARNING("invalid font (missing OS/2 table)");
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
// -- head table data
|
|
const HeadTable *headData = reinterpret_cast<const HeadTable*>(aFontData + headOffset);
|
|
|
|
if (headData->tableVersionNumber != HeadTable::HEAD_VERSION) {
|
|
NS_WARNING("invalid font (head table version)");
|
|
return false;
|
|
}
|
|
|
|
if (headData->magicNumber != HeadTable::HEAD_MAGIC_NUMBER) {
|
|
NS_WARNING("invalid font (head magic number)");
|
|
return false;
|
|
}
|
|
|
|
if (headData->checkSumAdjustment != (HeadTable::HEAD_CHECKSUM_CALC_CONST - checksum)) {
|
|
NS_WARNING("invalid font (bad checksum)");
|
|
// Bug 483459 - warn about a bad checksum but allow the font to be
|
|
// used, since a small percentage of fonts don't calculate this
|
|
// correctly and font systems aren't fussy about this
|
|
// return false;
|
|
}
|
|
|
|
// need glyf or CFF table based on sfnt version
|
|
if (sfntVersion == TRUETYPE_TAG('O','T','T','O')) {
|
|
if (!foundCFF) {
|
|
NS_WARNING("invalid font (missing CFF table)");
|
|
return false;
|
|
}
|
|
} else {
|
|
if (!foundGlyphs || !foundLoca) {
|
|
NS_WARNING("invalid font (missing glyf or loca table)");
|
|
return false;
|
|
}
|
|
|
|
// sanity-check 'loca' offsets
|
|
const MaxpTableHeader *maxpData =
|
|
reinterpret_cast<const MaxpTableHeader*>(aFontData + maxpOffset);
|
|
if (!ValidateLocaTable(aFontData + locaOffset, locaLen, glyfLen,
|
|
headData->indexToLocFormat,
|
|
maxpData->numGlyphs)) {
|
|
NS_WARNING("invalid font (loca table offsets)");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// -- name table data
|
|
const NameHeader *nameHeader = reinterpret_cast<const NameHeader*>(aFontData + nameOffset);
|
|
|
|
uint32_t nameCount = nameHeader->count;
|
|
|
|
// -- sanity check the number of name records
|
|
if (uint64_t(nameCount) * sizeof(NameRecord) + uint64_t(nameOffset) > dataLength) {
|
|
NS_WARNING("invalid font (name records)");
|
|
return false;
|
|
}
|
|
|
|
// -- iterate through name records
|
|
const NameRecord *nameRecord = reinterpret_cast<const NameRecord*>
|
|
(aFontData + nameOffset + sizeof(NameHeader));
|
|
uint64_t nameStringsBase = uint64_t(nameOffset) + uint64_t(nameHeader->stringOffset);
|
|
|
|
for (i = 0; i < nameCount; i++, nameRecord++) {
|
|
uint32_t namelen = nameRecord->length;
|
|
uint32_t nameoff = nameRecord->offset; // offset from base of string storage
|
|
|
|
if (nameStringsBase + uint64_t(nameoff) + uint64_t(namelen) > dataLength) {
|
|
NS_WARNING("invalid font (name table strings)");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// -- sanity-check the kern table, if present (see bug 487549)
|
|
if (foundKern) {
|
|
if (!ValidateKernTable(aFontData + kernOffset, kernLen)) {
|
|
NS_WARNING("invalid font (kern table)");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// everything seems consistent
|
|
return true;
|
|
}
|
|
|
|
nsresult
|
|
gfxFontUtils::RenameFont(const nsAString& aName, const uint8_t *aFontData,
|
|
uint32_t aFontDataLength, FallibleTArray<uint8_t> *aNewFont)
|
|
{
|
|
NS_ASSERTION(aNewFont, "null font data array");
|
|
|
|
uint64_t dataLength(aFontDataLength);
|
|
|
|
// new name table
|
|
static const uint32_t neededNameIDs[] = {NAME_ID_FAMILY,
|
|
NAME_ID_STYLE,
|
|
NAME_ID_UNIQUE,
|
|
NAME_ID_FULL,
|
|
NAME_ID_POSTSCRIPT};
|
|
|
|
// calculate new name table size
|
|
uint16_t nameCount = ArrayLength(neededNameIDs);
|
|
|
|
// leave room for null-terminator
|
|
uint16_t nameStrLength = (aName.Length() + 1) * sizeof(PRUnichar);
|
|
|
|
// round name table size up to 4-byte multiple
|
|
uint32_t nameTableSize = (sizeof(NameHeader) +
|
|
sizeof(NameRecord) * nameCount +
|
|
nameStrLength +
|
|
3) & ~3;
|
|
|
|
if (dataLength + nameTableSize > UINT32_MAX)
|
|
return NS_ERROR_FAILURE;
|
|
|
|
// bug 505386 - need to handle unpadded font length
|
|
uint32_t paddedFontDataSize = (aFontDataLength + 3) & ~3;
|
|
uint32_t adjFontDataSize = paddedFontDataSize + nameTableSize;
|
|
|
|
// create new buffer: old font data plus new name table
|
|
if (!aNewFont->AppendElements(adjFontDataSize))
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
// copy the old font data
|
|
uint8_t *newFontData = reinterpret_cast<uint8_t*>(aNewFont->Elements());
|
|
|
|
// null the last four bytes in case the font length is not a multiple of 4
|
|
memset(newFontData + aFontDataLength, 0, paddedFontDataSize - aFontDataLength);
|
|
|
|
// copy font data
|
|
memcpy(newFontData, aFontData, aFontDataLength);
|
|
|
|
// null out the last 4 bytes for checksum calculations
|
|
memset(newFontData + adjFontDataSize - 4, 0, 4);
|
|
|
|
NameHeader *nameHeader = reinterpret_cast<NameHeader*>(newFontData +
|
|
paddedFontDataSize);
|
|
|
|
// -- name header
|
|
nameHeader->format = 0;
|
|
nameHeader->count = nameCount;
|
|
nameHeader->stringOffset = sizeof(NameHeader) + nameCount * sizeof(NameRecord);
|
|
|
|
// -- name records
|
|
uint32_t i;
|
|
NameRecord *nameRecord = reinterpret_cast<NameRecord*>(nameHeader + 1);
|
|
|
|
for (i = 0; i < nameCount; i++, nameRecord++) {
|
|
nameRecord->platformID = PLATFORM_ID_MICROSOFT;
|
|
nameRecord->encodingID = ENCODING_ID_MICROSOFT_UNICODEBMP;
|
|
nameRecord->languageID = LANG_ID_MICROSOFT_EN_US;
|
|
nameRecord->nameID = neededNameIDs[i];
|
|
nameRecord->offset = 0;
|
|
nameRecord->length = nameStrLength;
|
|
}
|
|
|
|
// -- string data, located after the name records, stored in big-endian form
|
|
PRUnichar *strData = reinterpret_cast<PRUnichar*>(nameRecord);
|
|
|
|
const PRUnichar *nameStr = aName.BeginReading();
|
|
const PRUnichar *nameStrEnd = aName.EndReading();
|
|
while (nameStr < nameStrEnd) {
|
|
PRUnichar ch = *nameStr++;
|
|
*strData++ = NS_SWAP16(ch);
|
|
}
|
|
*strData = 0; // add null termination
|
|
|
|
// adjust name table header to point to the new name table
|
|
SFNTHeader *sfntHeader = reinterpret_cast<SFNTHeader*>(newFontData);
|
|
|
|
// table directory entries begin immediately following SFNT header
|
|
TableDirEntry *dirEntry =
|
|
reinterpret_cast<TableDirEntry*>(newFontData + sizeof(SFNTHeader));
|
|
|
|
uint32_t numTables = sfntHeader->numTables;
|
|
|
|
for (i = 0; i < numTables; i++, dirEntry++) {
|
|
if (dirEntry->tag == TRUETYPE_TAG('n','a','m','e')) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
// function only called if font validates, so this should always be true
|
|
NS_ASSERTION(i < numTables, "attempt to rename font with no name table");
|
|
|
|
// note: dirEntry now points to name record
|
|
|
|
// recalculate name table checksum
|
|
uint32_t checkSum = 0;
|
|
AutoSwap_PRUint32 *nameData = reinterpret_cast<AutoSwap_PRUint32*> (nameHeader);
|
|
AutoSwap_PRUint32 *nameDataEnd = nameData + (nameTableSize >> 2);
|
|
|
|
while (nameData < nameDataEnd)
|
|
checkSum = checkSum + *nameData++;
|
|
|
|
// adjust name table entry to point to new name table
|
|
dirEntry->offset = paddedFontDataSize;
|
|
dirEntry->length = nameTableSize;
|
|
dirEntry->checkSum = checkSum;
|
|
|
|
// fix up checksums
|
|
uint32_t checksum = 0;
|
|
|
|
// checksum for font = (checksum of header) + (checksum of tables)
|
|
uint32_t headerLen = sizeof(SFNTHeader) + sizeof(TableDirEntry) * numTables;
|
|
const AutoSwap_PRUint32 *headerData =
|
|
reinterpret_cast<const AutoSwap_PRUint32*>(newFontData);
|
|
|
|
// header length is in bytes, checksum calculated in longwords
|
|
for (i = 0; i < (headerLen >> 2); i++, headerData++) {
|
|
checksum += *headerData;
|
|
}
|
|
|
|
uint32_t headOffset = 0;
|
|
dirEntry = reinterpret_cast<TableDirEntry*>(newFontData + sizeof(SFNTHeader));
|
|
|
|
for (i = 0; i < numTables; i++, dirEntry++) {
|
|
if (dirEntry->tag == TRUETYPE_TAG('h','e','a','d')) {
|
|
headOffset = dirEntry->offset;
|
|
}
|
|
checksum += dirEntry->checkSum;
|
|
}
|
|
|
|
NS_ASSERTION(headOffset != 0, "no head table for font");
|
|
|
|
HeadTable *headData = reinterpret_cast<HeadTable*>(newFontData + headOffset);
|
|
|
|
headData->checkSumAdjustment = HeadTable::HEAD_CHECKSUM_CALC_CONST - checksum;
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
// This is only called after the basic validity of the downloaded sfnt
|
|
// data has been checked, so it should never fail to find the name table
|
|
// (though it might fail to read it, if memory isn't available);
|
|
// other checks here are just for extra paranoia.
|
|
nsresult
|
|
gfxFontUtils::GetFullNameFromSFNT(const uint8_t* aFontData, uint32_t aLength,
|
|
nsAString& aFullName)
|
|
{
|
|
aFullName.AssignLiteral("(MISSING NAME)"); // should always get replaced
|
|
|
|
NS_ENSURE_TRUE(aLength >= sizeof(SFNTHeader), NS_ERROR_UNEXPECTED);
|
|
const SFNTHeader *sfntHeader =
|
|
reinterpret_cast<const SFNTHeader*>(aFontData);
|
|
const TableDirEntry *dirEntry =
|
|
reinterpret_cast<const TableDirEntry*>(aFontData + sizeof(SFNTHeader));
|
|
uint32_t numTables = sfntHeader->numTables;
|
|
NS_ENSURE_TRUE(aLength >=
|
|
sizeof(SFNTHeader) + numTables * sizeof(TableDirEntry),
|
|
NS_ERROR_UNEXPECTED);
|
|
bool foundName = false;
|
|
for (uint32_t i = 0; i < numTables; i++, dirEntry++) {
|
|
if (dirEntry->tag == TRUETYPE_TAG('n','a','m','e')) {
|
|
foundName = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// should never fail, as we're only called after font validation succeeded
|
|
NS_ENSURE_TRUE(foundName, NS_ERROR_NOT_AVAILABLE);
|
|
|
|
uint32_t len = dirEntry->length;
|
|
NS_ENSURE_TRUE(aLength > len && aLength - len >= dirEntry->offset,
|
|
NS_ERROR_UNEXPECTED);
|
|
FallibleTArray<uint8_t> nameTable;
|
|
if (!nameTable.SetLength(len)) {
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
memcpy(nameTable.Elements(), aFontData + dirEntry->offset, len);
|
|
|
|
return GetFullNameFromTable(nameTable, aFullName);
|
|
}
|
|
|
|
nsresult
|
|
gfxFontUtils::GetFullNameFromTable(FallibleTArray<uint8_t>& aNameTable,
|
|
nsAString& aFullName)
|
|
{
|
|
nsAutoString name;
|
|
nsresult rv =
|
|
gfxFontUtils::ReadCanonicalName(aNameTable,
|
|
gfxFontUtils::NAME_ID_FULL,
|
|
name);
|
|
if (NS_SUCCEEDED(rv) && !name.IsEmpty()) {
|
|
aFullName = name;
|
|
return NS_OK;
|
|
}
|
|
rv = gfxFontUtils::ReadCanonicalName(aNameTable,
|
|
gfxFontUtils::NAME_ID_FAMILY,
|
|
name);
|
|
if (NS_SUCCEEDED(rv) && !name.IsEmpty()) {
|
|
nsAutoString styleName;
|
|
rv = gfxFontUtils::ReadCanonicalName(aNameTable,
|
|
gfxFontUtils::NAME_ID_STYLE,
|
|
styleName);
|
|
if (NS_SUCCEEDED(rv) && !styleName.IsEmpty()) {
|
|
name.AppendLiteral(" ");
|
|
name.Append(styleName);
|
|
aFullName = name;
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
return NS_ERROR_NOT_AVAILABLE;
|
|
}
|
|
|
|
enum {
|
|
#if defined(XP_MACOSX)
|
|
CANONICAL_LANG_ID = gfxFontUtils::LANG_ID_MAC_ENGLISH,
|
|
PLATFORM_ID = gfxFontUtils::PLATFORM_ID_MAC
|
|
#else
|
|
CANONICAL_LANG_ID = gfxFontUtils::LANG_ID_MICROSOFT_EN_US,
|
|
PLATFORM_ID = gfxFontUtils::PLATFORM_ID_MICROSOFT
|
|
#endif
|
|
};
|
|
|
|
nsresult
|
|
gfxFontUtils::ReadNames(FallibleTArray<uint8_t>& aNameTable, uint32_t aNameID,
|
|
int32_t aPlatformID, nsTArray<nsString>& aNames)
|
|
{
|
|
return ReadNames(aNameTable, aNameID, LANG_ALL, aPlatformID, aNames);
|
|
}
|
|
|
|
nsresult
|
|
gfxFontUtils::ReadCanonicalName(FallibleTArray<uint8_t>& aNameTable, uint32_t aNameID,
|
|
nsString& aName)
|
|
{
|
|
nsresult rv;
|
|
|
|
nsTArray<nsString> names;
|
|
|
|
// first, look for the English name (this will succeed 99% of the time)
|
|
rv = ReadNames(aNameTable, aNameID, CANONICAL_LANG_ID, PLATFORM_ID, names);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
// otherwise, grab names for all languages
|
|
if (names.Length() == 0) {
|
|
rv = ReadNames(aNameTable, aNameID, LANG_ALL, PLATFORM_ID, names);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
}
|
|
|
|
#if defined(XP_MACOSX)
|
|
// may be dealing with font that only has Microsoft name entries
|
|
if (names.Length() == 0) {
|
|
rv = ReadNames(aNameTable, aNameID, LANG_ID_MICROSOFT_EN_US,
|
|
PLATFORM_ID_MICROSOFT, names);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
// getting really desperate now, take anything!
|
|
if (names.Length() == 0) {
|
|
rv = ReadNames(aNameTable, aNameID, LANG_ALL,
|
|
PLATFORM_ID_MICROSOFT, names);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
// return the first name (99.9% of the time names will
|
|
// contain a single English name)
|
|
if (names.Length()) {
|
|
aName.Assign(names[0]);
|
|
return NS_OK;
|
|
}
|
|
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
// Charsets to use for decoding Mac platform font names.
|
|
// This table is sorted by {encoding, language}, with the wildcard "ANY" being
|
|
// greater than any defined values for each field; we use a binary search on both
|
|
// fields, and fall back to matching only encoding if necessary
|
|
|
|
// Some "redundant" entries for specific combinations are included such as
|
|
// encoding=roman, lang=english, in order that common entries will be found
|
|
// on the first search.
|
|
|
|
#define ANY 0xffff
|
|
const gfxFontUtils::MacFontNameCharsetMapping gfxFontUtils::gMacFontNameCharsets[] =
|
|
{
|
|
{ ENCODING_ID_MAC_ROMAN, LANG_ID_MAC_ENGLISH, "macintosh" },
|
|
{ ENCODING_ID_MAC_ROMAN, LANG_ID_MAC_ICELANDIC, "x-mac-icelandic" },
|
|
{ ENCODING_ID_MAC_ROMAN, LANG_ID_MAC_TURKISH, "x-mac-turkish" },
|
|
{ ENCODING_ID_MAC_ROMAN, LANG_ID_MAC_POLISH, "x-mac-ce" },
|
|
{ ENCODING_ID_MAC_ROMAN, LANG_ID_MAC_ROMANIAN, "x-mac-romanian" },
|
|
{ ENCODING_ID_MAC_ROMAN, LANG_ID_MAC_CZECH, "x-mac-ce" },
|
|
{ ENCODING_ID_MAC_ROMAN, LANG_ID_MAC_SLOVAK, "x-mac-ce" },
|
|
{ ENCODING_ID_MAC_ROMAN, ANY, "macintosh" },
|
|
{ ENCODING_ID_MAC_JAPANESE, LANG_ID_MAC_JAPANESE, "Shift_JIS" },
|
|
{ ENCODING_ID_MAC_JAPANESE, ANY, "Shift_JIS" },
|
|
{ ENCODING_ID_MAC_TRAD_CHINESE, LANG_ID_MAC_TRAD_CHINESE, "Big5" },
|
|
{ ENCODING_ID_MAC_TRAD_CHINESE, ANY, "Big5" },
|
|
{ ENCODING_ID_MAC_KOREAN, LANG_ID_MAC_KOREAN, "EUC-KR" },
|
|
{ ENCODING_ID_MAC_KOREAN, ANY, "EUC-KR" },
|
|
{ ENCODING_ID_MAC_ARABIC, LANG_ID_MAC_ARABIC, "x-mac-arabic" },
|
|
{ ENCODING_ID_MAC_ARABIC, LANG_ID_MAC_URDU, "x-mac-farsi" },
|
|
{ ENCODING_ID_MAC_ARABIC, LANG_ID_MAC_FARSI, "x-mac-farsi" },
|
|
{ ENCODING_ID_MAC_ARABIC, ANY, "x-mac-arabic" },
|
|
{ ENCODING_ID_MAC_HEBREW, LANG_ID_MAC_HEBREW, "x-mac-hebrew" },
|
|
{ ENCODING_ID_MAC_HEBREW, ANY, "x-mac-hebrew" },
|
|
{ ENCODING_ID_MAC_GREEK, ANY, "x-mac-greek" },
|
|
{ ENCODING_ID_MAC_CYRILLIC, ANY, "x-mac-cyrillic" },
|
|
{ ENCODING_ID_MAC_DEVANAGARI, ANY, "x-mac-devanagari"},
|
|
{ ENCODING_ID_MAC_GURMUKHI, ANY, "x-mac-gurmukhi" },
|
|
{ ENCODING_ID_MAC_GUJARATI, ANY, "x-mac-gujarati" },
|
|
{ ENCODING_ID_MAC_SIMP_CHINESE, LANG_ID_MAC_SIMP_CHINESE, "GB2312" },
|
|
{ ENCODING_ID_MAC_SIMP_CHINESE, ANY, "GB2312" }
|
|
};
|
|
|
|
const char* gfxFontUtils::gISOFontNameCharsets[] =
|
|
{
|
|
/* 0 */ "us-ascii" ,
|
|
/* 1 */ nullptr , /* spec says "ISO 10646" but does not specify encoding form! */
|
|
/* 2 */ "ISO-8859-1"
|
|
};
|
|
|
|
const char* gfxFontUtils::gMSFontNameCharsets[] =
|
|
{
|
|
/* [0] ENCODING_ID_MICROSOFT_SYMBOL */ "" ,
|
|
/* [1] ENCODING_ID_MICROSOFT_UNICODEBMP */ "" ,
|
|
/* [2] ENCODING_ID_MICROSOFT_SHIFTJIS */ "Shift_JIS" ,
|
|
/* [3] ENCODING_ID_MICROSOFT_PRC */ nullptr ,
|
|
/* [4] ENCODING_ID_MICROSOFT_BIG5 */ "Big5" ,
|
|
/* [5] ENCODING_ID_MICROSOFT_WANSUNG */ nullptr ,
|
|
/* [6] ENCODING_ID_MICROSOFT_JOHAB */ "x-johab" ,
|
|
/* [7] reserved */ nullptr ,
|
|
/* [8] reserved */ nullptr ,
|
|
/* [9] reserved */ nullptr ,
|
|
/*[10] ENCODING_ID_MICROSOFT_UNICODEFULL */ ""
|
|
};
|
|
|
|
#define ARRAY_SIZE(A) (sizeof(A) / sizeof(A[0]))
|
|
|
|
// Return the name of the charset we should use to decode a font name
|
|
// given the name table attributes.
|
|
// Special return values:
|
|
// "" charset is UTF16BE, no need for a converter
|
|
// nullptr unknown charset, do not attempt conversion
|
|
const char*
|
|
gfxFontUtils::GetCharsetForFontName(uint16_t aPlatform, uint16_t aScript, uint16_t aLanguage)
|
|
{
|
|
switch (aPlatform)
|
|
{
|
|
case PLATFORM_ID_UNICODE:
|
|
return "";
|
|
|
|
case PLATFORM_ID_MAC:
|
|
{
|
|
uint32_t lo = 0, hi = ARRAY_SIZE(gMacFontNameCharsets);
|
|
MacFontNameCharsetMapping searchValue = { aScript, aLanguage, nullptr };
|
|
for (uint32_t i = 0; i < 2; ++i) {
|
|
// binary search; if not found, set language to ANY and try again
|
|
while (lo < hi) {
|
|
uint32_t mid = (lo + hi) / 2;
|
|
const MacFontNameCharsetMapping& entry = gMacFontNameCharsets[mid];
|
|
if (entry < searchValue) {
|
|
lo = mid + 1;
|
|
continue;
|
|
}
|
|
if (searchValue < entry) {
|
|
hi = mid;
|
|
continue;
|
|
}
|
|
// found a match
|
|
return entry.mCharsetName;
|
|
}
|
|
|
|
// no match, so reset high bound for search and re-try
|
|
hi = ARRAY_SIZE(gMacFontNameCharsets);
|
|
searchValue.mLanguage = ANY;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case PLATFORM_ID_ISO:
|
|
if (aScript < ARRAY_SIZE(gISOFontNameCharsets)) {
|
|
return gISOFontNameCharsets[aScript];
|
|
}
|
|
break;
|
|
|
|
case PLATFORM_ID_MICROSOFT:
|
|
if (aScript < ARRAY_SIZE(gMSFontNameCharsets)) {
|
|
return gMSFontNameCharsets[aScript];
|
|
}
|
|
break;
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
// convert a raw name from the name table to an nsString, if possible;
|
|
// return value indicates whether conversion succeeded
|
|
bool
|
|
gfxFontUtils::DecodeFontName(const uint8_t *aNameData, int32_t aByteLen,
|
|
uint32_t aPlatformCode, uint32_t aScriptCode,
|
|
uint32_t aLangCode, nsAString& aName)
|
|
{
|
|
NS_ASSERTION(aByteLen > 0, "bad length for font name data");
|
|
|
|
const char *csName = GetCharsetForFontName(aPlatformCode, aScriptCode, aLangCode);
|
|
|
|
if (!csName) {
|
|
// nullptr -> unknown charset
|
|
#ifdef DEBUG
|
|
char warnBuf[128];
|
|
if (aByteLen > 64)
|
|
aByteLen = 64;
|
|
sprintf(warnBuf, "skipping font name, unknown charset %d:%d:%d for <%.*s>",
|
|
aPlatformCode, aScriptCode, aLangCode, aByteLen, aNameData);
|
|
NS_WARNING(warnBuf);
|
|
#endif
|
|
return false;
|
|
}
|
|
|
|
if (csName[0] == 0) {
|
|
// empty charset name: data is utf16be, no need to instantiate a converter
|
|
uint32_t strLen = aByteLen / 2;
|
|
#ifdef IS_LITTLE_ENDIAN
|
|
aName.SetLength(strLen);
|
|
CopySwapUTF16(reinterpret_cast<const uint16_t*>(aNameData),
|
|
reinterpret_cast<uint16_t*>(aName.BeginWriting()), strLen);
|
|
#else
|
|
aName.Assign(reinterpret_cast<const PRUnichar*>(aNameData), strLen);
|
|
#endif
|
|
return true;
|
|
}
|
|
|
|
nsresult rv;
|
|
nsCOMPtr<nsICharsetConverterManager> ccm =
|
|
do_GetService(NS_CHARSETCONVERTERMANAGER_CONTRACTID, &rv);
|
|
NS_ASSERTION(NS_SUCCEEDED(rv), "failed to get charset converter manager");
|
|
if (NS_FAILED(rv)) {
|
|
return false;
|
|
}
|
|
|
|
nsCOMPtr<nsIUnicodeDecoder> decoder;
|
|
rv = ccm->GetUnicodeDecoderRaw(csName, getter_AddRefs(decoder));
|
|
if (NS_FAILED(rv)) {
|
|
NS_WARNING("failed to get the decoder for a font name string");
|
|
return false;
|
|
}
|
|
|
|
int32_t destLength;
|
|
rv = decoder->GetMaxLength(reinterpret_cast<const char*>(aNameData), aByteLen, &destLength);
|
|
if (NS_FAILED(rv)) {
|
|
NS_WARNING("decoder->GetMaxLength failed, invalid font name?");
|
|
return false;
|
|
}
|
|
|
|
// make space for the converted string
|
|
aName.SetLength(destLength);
|
|
rv = decoder->Convert(reinterpret_cast<const char*>(aNameData), &aByteLen,
|
|
aName.BeginWriting(), &destLength);
|
|
if (NS_FAILED(rv)) {
|
|
NS_WARNING("decoder->Convert failed, invalid font name?");
|
|
return false;
|
|
}
|
|
aName.Truncate(destLength); // set the actual length
|
|
|
|
return true;
|
|
}
|
|
|
|
nsresult
|
|
gfxFontUtils::ReadNames(FallibleTArray<uint8_t>& aNameTable, uint32_t aNameID,
|
|
int32_t aLangID, int32_t aPlatformID,
|
|
nsTArray<nsString>& aNames)
|
|
{
|
|
uint32_t nameTableLen = aNameTable.Length();
|
|
NS_ASSERTION(nameTableLen != 0, "null name table");
|
|
|
|
if (nameTableLen == 0)
|
|
return NS_ERROR_FAILURE;
|
|
|
|
uint8_t *nameTable = aNameTable.Elements();
|
|
|
|
// -- name table data
|
|
const NameHeader *nameHeader = reinterpret_cast<const NameHeader*>(nameTable);
|
|
|
|
uint32_t nameCount = nameHeader->count;
|
|
|
|
// -- sanity check the number of name records
|
|
if (uint64_t(nameCount) * sizeof(NameRecord) > nameTableLen) {
|
|
NS_WARNING("invalid font (name table data)");
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
// -- iterate through name records
|
|
const NameRecord *nameRecord
|
|
= reinterpret_cast<const NameRecord*>(nameTable + sizeof(NameHeader));
|
|
uint64_t nameStringsBase = uint64_t(nameHeader->stringOffset);
|
|
|
|
uint32_t i;
|
|
for (i = 0; i < nameCount; i++, nameRecord++) {
|
|
uint32_t platformID;
|
|
|
|
// skip over unwanted nameID's
|
|
if (uint32_t(nameRecord->nameID) != aNameID)
|
|
continue;
|
|
|
|
// skip over unwanted platform data
|
|
platformID = nameRecord->platformID;
|
|
if (aPlatformID != PLATFORM_ALL
|
|
&& uint32_t(nameRecord->platformID) != PLATFORM_ID)
|
|
continue;
|
|
|
|
// skip over unwanted languages
|
|
if (aLangID != LANG_ALL
|
|
&& uint32_t(nameRecord->languageID) != uint32_t(aLangID))
|
|
continue;
|
|
|
|
// add name to names array
|
|
|
|
// -- calculate string location
|
|
uint32_t namelen = nameRecord->length;
|
|
uint32_t nameoff = nameRecord->offset; // offset from base of string storage
|
|
|
|
if (nameStringsBase + uint64_t(nameoff) + uint64_t(namelen)
|
|
> nameTableLen) {
|
|
NS_WARNING("invalid font (name table strings)");
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
// -- decode if necessary and make nsString
|
|
nsAutoString name;
|
|
|
|
DecodeFontName(nameTable + nameStringsBase + nameoff, namelen,
|
|
platformID, uint32_t(nameRecord->encodingID),
|
|
uint32_t(nameRecord->languageID), name);
|
|
|
|
uint32_t k, numNames;
|
|
bool foundName = false;
|
|
|
|
numNames = aNames.Length();
|
|
for (k = 0; k < numNames; k++) {
|
|
if (name.Equals(aNames[k])) {
|
|
foundName = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!foundName)
|
|
aNames.AppendElement(name);
|
|
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
#ifdef XP_WIN
|
|
|
|
// Embedded OpenType (EOT) handling
|
|
// needed for dealing with downloadable fonts on Windows
|
|
//
|
|
// EOT version 0x00020001
|
|
// based on http://www.w3.org/Submission/2008/SUBM-EOT-20080305/
|
|
//
|
|
// EOT header consists of a fixed-size portion containing general font
|
|
// info, followed by a variable-sized portion containing name data,
|
|
// followed by the actual TT/OT font data (non-byte values are always
|
|
// stored in big-endian format)
|
|
//
|
|
// EOT header is stored in *little* endian order!!
|
|
|
|
#pragma pack(1)
|
|
|
|
struct EOTFixedHeader {
|
|
|
|
uint32_t eotSize; // Total structure length in PRUint8s (including string and font data)
|
|
uint32_t fontDataSize; // Length of the OpenType font (FontData) in PRUint8s
|
|
uint32_t version; // Version number of this format - 0x00010000
|
|
uint32_t flags; // Processing Flags
|
|
uint8_t panose[10]; // The PANOSE value for this font - See http://www.microsoft.com/typography/otspec/os2.htm#pan
|
|
uint8_t charset; // In Windows this is derived from TEXTMETRIC.tmCharSet. This value specifies the character set of the font. DEFAULT_CHARSET (0x01) indicates no preference. - See http://msdn2.microsoft.com/en-us/library/ms534202.aspx
|
|
uint8_t italic; // If the bit for ITALIC is set in OS/2.fsSelection, the value will be 0x01 - See http://www.microsoft.com/typography/otspec/os2.htm#fss
|
|
uint32_t weight; // The weight value for this font - See http://www.microsoft.com/typography/otspec/os2.htm#wtc
|
|
uint16_t fsType; // Type flags that provide information about embedding permissions - See http://www.microsoft.com/typography/otspec/os2.htm#fst
|
|
uint16_t magicNumber; // Magic number for EOT file - 0x504C. Used to check for data corruption.
|
|
uint32_t unicodeRange1; // OS/2.UnicodeRange1 (bits 0-31) - See http://www.microsoft.com/typography/otspec/os2.htm#ur
|
|
uint32_t unicodeRange2; // OS/2.UnicodeRange2 (bits 32-63) - See http://www.microsoft.com/typography/otspec/os2.htm#ur
|
|
uint32_t unicodeRange3; // OS/2.UnicodeRange3 (bits 64-95) - See http://www.microsoft.com/typography/otspec/os2.htm#ur
|
|
uint32_t unicodeRange4; // OS/2.UnicodeRange4 (bits 96-127) - See http://www.microsoft.com/typography/otspec/os2.htm#ur
|
|
uint32_t codePageRange1; // CodePageRange1 (bits 0-31) - See http://www.microsoft.com/typography/otspec/os2.htm#cpr
|
|
uint32_t codePageRange2; // CodePageRange2 (bits 32-63) - See http://www.microsoft.com/typography/otspec/os2.htm#cpr
|
|
uint32_t checkSumAdjustment; // head.CheckSumAdjustment - See http://www.microsoft.com/typography/otspec/head.htm
|
|
uint32_t reserved[4]; // Reserved - must be 0
|
|
uint16_t padding1; // Padding to maintain long alignment. Padding value must always be set to 0x0000.
|
|
|
|
enum {
|
|
EOT_VERSION = 0x00020001,
|
|
EOT_MAGIC_NUMBER = 0x504c,
|
|
EOT_DEFAULT_CHARSET = 0x01,
|
|
EOT_EMBED_PRINT_PREVIEW = 0x0004,
|
|
EOT_FAMILY_NAME_INDEX = 0, // order of names in variable portion of EOT header
|
|
EOT_STYLE_NAME_INDEX = 1,
|
|
EOT_VERSION_NAME_INDEX = 2,
|
|
EOT_FULL_NAME_INDEX = 3,
|
|
EOT_NUM_NAMES = 4
|
|
};
|
|
|
|
};
|
|
|
|
#pragma pack()
|
|
|
|
// EOT headers are only used on Windows
|
|
|
|
// EOT variable-sized header (version 0x00020001 - contains 4 name
|
|
// fields, each with the structure):
|
|
//
|
|
// // number of bytes in the name array
|
|
// uint16_t size;
|
|
// // array of UTF-16 chars, total length = <size> bytes
|
|
// // note: english version of name record string
|
|
// uint8_t name[size];
|
|
//
|
|
// This structure is used for the following names, each separated by two
|
|
// bytes of padding (always 0 with no padding after the rootString):
|
|
//
|
|
// familyName - based on name ID = 1
|
|
// styleName - based on name ID = 2
|
|
// versionName - based on name ID = 5
|
|
// fullName - based on name ID = 4
|
|
// rootString - used to restrict font usage to a specific domain
|
|
//
|
|
|
|
#if DEBUG
|
|
static void
|
|
DumpEOTHeader(uint8_t *aHeader, uint32_t aHeaderLen)
|
|
{
|
|
uint32_t offset = 0;
|
|
uint8_t *ch = aHeader;
|
|
|
|
printf("\n\nlen == %d\n\n", aHeaderLen);
|
|
while (offset < aHeaderLen) {
|
|
printf("%7.7x ", offset);
|
|
int i;
|
|
for (i = 0; i < 16; i++) {
|
|
printf("%2.2x ", *ch++);
|
|
}
|
|
printf("\n");
|
|
offset += 16;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
nsresult
|
|
gfxFontUtils::MakeEOTHeader(const uint8_t *aFontData, uint32_t aFontDataLength,
|
|
FallibleTArray<uint8_t> *aHeader,
|
|
FontDataOverlay *aOverlay)
|
|
{
|
|
NS_ASSERTION(aFontData && aFontDataLength != 0, "null font data");
|
|
NS_ASSERTION(aHeader, "null header");
|
|
NS_ASSERTION(aHeader->Length() == 0, "non-empty header passed in");
|
|
NS_ASSERTION(aOverlay, "null font overlay struct passed in");
|
|
|
|
aOverlay->overlaySrc = 0;
|
|
|
|
if (!aHeader->AppendElements(sizeof(EOTFixedHeader)))
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
EOTFixedHeader *eotHeader = reinterpret_cast<EOTFixedHeader*>(aHeader->Elements());
|
|
memset(eotHeader, 0, sizeof(EOTFixedHeader));
|
|
|
|
uint32_t fontDataSize = aFontDataLength;
|
|
|
|
// set up header fields
|
|
eotHeader->fontDataSize = fontDataSize;
|
|
eotHeader->version = EOTFixedHeader::EOT_VERSION;
|
|
eotHeader->flags = 0; // don't specify any special processing
|
|
eotHeader->charset = EOTFixedHeader::EOT_DEFAULT_CHARSET;
|
|
eotHeader->fsType = EOTFixedHeader::EOT_EMBED_PRINT_PREVIEW;
|
|
eotHeader->magicNumber = EOTFixedHeader::EOT_MAGIC_NUMBER;
|
|
|
|
// read in the sfnt header
|
|
if (sizeof(SFNTHeader) > aFontDataLength)
|
|
return NS_ERROR_FAILURE;
|
|
|
|
const SFNTHeader *sfntHeader = reinterpret_cast<const SFNTHeader*>(aFontData);
|
|
if (!IsValidSFNTVersion(sfntHeader->sfntVersion))
|
|
return NS_ERROR_FAILURE;
|
|
|
|
// iterate through the table headers to find the head, name and OS/2 tables
|
|
bool foundHead = false, foundOS2 = false, foundName = false, foundGlyphs = false;
|
|
uint32_t headOffset, headLen, nameOffset, nameLen, os2Offset, os2Len;
|
|
uint32_t i, numTables;
|
|
|
|
numTables = sfntHeader->numTables;
|
|
if (sizeof(SFNTHeader) + sizeof(TableDirEntry) * numTables > aFontDataLength)
|
|
return NS_ERROR_FAILURE;
|
|
|
|
uint64_t dataLength(aFontDataLength);
|
|
|
|
// table directory entries begin immediately following SFNT header
|
|
const TableDirEntry *dirEntry = reinterpret_cast<const TableDirEntry*>(aFontData + sizeof(SFNTHeader));
|
|
|
|
for (i = 0; i < numTables; i++, dirEntry++) {
|
|
|
|
// sanity check on offset, length values
|
|
if (uint64_t(dirEntry->offset) + uint64_t(dirEntry->length) > dataLength)
|
|
return NS_ERROR_FAILURE;
|
|
|
|
switch (dirEntry->tag) {
|
|
|
|
case TRUETYPE_TAG('h','e','a','d'):
|
|
foundHead = true;
|
|
headOffset = dirEntry->offset;
|
|
headLen = dirEntry->length;
|
|
if (headLen < sizeof(HeadTable))
|
|
return NS_ERROR_FAILURE;
|
|
break;
|
|
|
|
case TRUETYPE_TAG('n','a','m','e'):
|
|
foundName = true;
|
|
nameOffset = dirEntry->offset;
|
|
nameLen = dirEntry->length;
|
|
break;
|
|
|
|
case TRUETYPE_TAG('O','S','/','2'):
|
|
foundOS2 = true;
|
|
os2Offset = dirEntry->offset;
|
|
os2Len = dirEntry->length;
|
|
break;
|
|
|
|
case TRUETYPE_TAG('g','l','y','f'): // TrueType-style quadratic glyph table
|
|
foundGlyphs = true;
|
|
break;
|
|
|
|
case TRUETYPE_TAG('C','F','F',' '): // PS-style cubic glyph table
|
|
foundGlyphs = true;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (foundHead && foundName && foundOS2 && foundGlyphs)
|
|
break;
|
|
}
|
|
|
|
// require these three tables on Windows
|
|
if (!foundHead || !foundName || !foundOS2)
|
|
return NS_ERROR_FAILURE;
|
|
|
|
// at this point, all table offset/length values are within bounds
|
|
|
|
// read in the data from those tables
|
|
|
|
// -- head table data
|
|
const HeadTable *headData = reinterpret_cast<const HeadTable*>(aFontData + headOffset);
|
|
|
|
if (headData->tableVersionNumber != HeadTable::HEAD_VERSION ||
|
|
headData->magicNumber != HeadTable::HEAD_MAGIC_NUMBER) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
eotHeader->checkSumAdjustment = headData->checkSumAdjustment;
|
|
|
|
// -- name table data
|
|
|
|
// -- first, read name table header
|
|
const NameHeader *nameHeader = reinterpret_cast<const NameHeader*>(aFontData + nameOffset);
|
|
uint32_t nameStringsBase = uint32_t(nameHeader->stringOffset);
|
|
|
|
uint32_t nameCount = nameHeader->count;
|
|
|
|
// -- sanity check the number of name records
|
|
if (uint64_t(nameCount) * sizeof(NameRecord) + uint64_t(nameOffset) > dataLength)
|
|
return NS_ERROR_FAILURE;
|
|
|
|
// bug 496573 -- dummy names in case the font didn't contain English names
|
|
const nsString dummyNames[EOTFixedHeader::EOT_NUM_NAMES] = {
|
|
NS_LITERAL_STRING("Unknown"),
|
|
NS_LITERAL_STRING("Regular"),
|
|
EmptyString(),
|
|
dummyNames[EOTFixedHeader::EOT_FAMILY_NAME_INDEX]
|
|
};
|
|
|
|
// -- iterate through name records, look for specific name ids with
|
|
// matching platform/encoding/etc. and store offset/lengths
|
|
NameRecordData names[EOTFixedHeader::EOT_NUM_NAMES] = {0};
|
|
const NameRecord *nameRecord = reinterpret_cast<const NameRecord*>(aFontData + nameOffset + sizeof(NameHeader));
|
|
uint32_t needNames = (1 << EOTFixedHeader::EOT_FAMILY_NAME_INDEX) |
|
|
(1 << EOTFixedHeader::EOT_STYLE_NAME_INDEX) |
|
|
(1 << EOTFixedHeader::EOT_FULL_NAME_INDEX) |
|
|
(1 << EOTFixedHeader::EOT_VERSION_NAME_INDEX);
|
|
|
|
for (i = 0; i < nameCount; i++, nameRecord++) {
|
|
|
|
// looking for Microsoft English US name strings, skip others
|
|
if (uint32_t(nameRecord->platformID) != PLATFORM_ID_MICROSOFT ||
|
|
uint32_t(nameRecord->encodingID) != ENCODING_ID_MICROSOFT_UNICODEBMP ||
|
|
uint32_t(nameRecord->languageID) != LANG_ID_MICROSOFT_EN_US)
|
|
continue;
|
|
|
|
uint32_t index;
|
|
switch ((uint32_t)nameRecord->nameID) {
|
|
|
|
case NAME_ID_FAMILY:
|
|
index = EOTFixedHeader::EOT_FAMILY_NAME_INDEX;
|
|
break;
|
|
|
|
case NAME_ID_STYLE:
|
|
index = EOTFixedHeader::EOT_STYLE_NAME_INDEX;
|
|
break;
|
|
|
|
case NAME_ID_FULL:
|
|
index = EOTFixedHeader::EOT_FULL_NAME_INDEX;
|
|
break;
|
|
|
|
case NAME_ID_VERSION:
|
|
index = EOTFixedHeader::EOT_VERSION_NAME_INDEX;
|
|
break;
|
|
|
|
default:
|
|
continue;
|
|
}
|
|
|
|
names[index].offset = nameRecord->offset;
|
|
names[index].length = nameRecord->length;
|
|
needNames &= ~(1 << index);
|
|
|
|
if (needNames == 0)
|
|
break;
|
|
}
|
|
|
|
// -- expand buffer if needed to include variable-length portion
|
|
uint32_t eotVariableLength = 0;
|
|
for (i = 0; i < EOTFixedHeader::EOT_NUM_NAMES; i++) {
|
|
if (!(needNames & (1 << i))) {
|
|
eotVariableLength += names[i].length & (~1);
|
|
} else {
|
|
eotVariableLength += dummyNames[i].Length() * sizeof(PRUnichar);
|
|
}
|
|
}
|
|
eotVariableLength += EOTFixedHeader::EOT_NUM_NAMES * (2 /* size */
|
|
+ 2 /* padding */) +
|
|
2 /* null root string size */;
|
|
|
|
if (!aHeader->AppendElements(eotVariableLength))
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
// append the string data to the end of the EOT header
|
|
uint8_t *eotEnd = aHeader->Elements() + sizeof(EOTFixedHeader);
|
|
uint32_t strOffset, strLen;
|
|
|
|
for (i = 0; i < EOTFixedHeader::EOT_NUM_NAMES; i++) {
|
|
if (!(needNames & (1 << i))) {
|
|
uint32_t namelen = names[i].length;
|
|
uint32_t nameoff = names[i].offset; // offset from base of string storage
|
|
|
|
// sanity check the name string location
|
|
if (uint64_t(nameOffset) + uint64_t(nameStringsBase) +
|
|
uint64_t(nameoff) + uint64_t(namelen) > dataLength) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
strOffset = nameOffset + nameStringsBase + nameoff;
|
|
|
|
// output 2-byte str size
|
|
strLen = namelen & (~1); // UTF-16 string len must be even
|
|
*((uint16_t*) eotEnd) = uint16_t(strLen);
|
|
eotEnd += 2;
|
|
|
|
// length is number of UTF-16 chars, not bytes
|
|
CopySwapUTF16(reinterpret_cast<const uint16_t*>(aFontData + strOffset),
|
|
reinterpret_cast<uint16_t*>(eotEnd),
|
|
(strLen >> 1));
|
|
} else {
|
|
// bug 496573 -- English names are not present.
|
|
// supply an artificial one.
|
|
strLen = dummyNames[i].Length() * sizeof(PRUnichar);
|
|
*((uint16_t*) eotEnd) = uint16_t(strLen);
|
|
eotEnd += 2;
|
|
|
|
memcpy(eotEnd, dummyNames[i].BeginReading(), strLen);
|
|
}
|
|
eotEnd += strLen;
|
|
|
|
// add 2-byte zero padding to the end of each string
|
|
*eotEnd++ = 0;
|
|
*eotEnd++ = 0;
|
|
|
|
// Note: Microsoft's WEFT tool produces name strings which
|
|
// include an extra null at the end of each string, in addition
|
|
// to the 2-byte zero padding that separates the string fields.
|
|
// Don't think this is important to imitate...
|
|
}
|
|
|
|
// append null root string size
|
|
*eotEnd++ = 0;
|
|
*eotEnd++ = 0;
|
|
|
|
NS_ASSERTION(eotEnd == aHeader->Elements() + aHeader->Length(),
|
|
"header length calculation incorrect");
|
|
|
|
// bug 496573 -- fonts with a fullname that does not begin with the
|
|
// family name cause the EOT font loading API to hiccup
|
|
uint32_t famOff = names[EOTFixedHeader::EOT_FAMILY_NAME_INDEX].offset;
|
|
uint32_t famLen = names[EOTFixedHeader::EOT_FAMILY_NAME_INDEX].length;
|
|
uint32_t fullOff = names[EOTFixedHeader::EOT_FULL_NAME_INDEX].offset;
|
|
uint32_t fullLen = names[EOTFixedHeader::EOT_FULL_NAME_INDEX].length;
|
|
|
|
const uint8_t *nameStrings = aFontData + nameOffset + nameStringsBase;
|
|
|
|
// assure that the start of the fullname matches the family name
|
|
if (famLen <= fullLen
|
|
&& memcmp(nameStrings + famOff, nameStrings + fullOff, famLen)) {
|
|
aOverlay->overlaySrc = nameOffset + nameStringsBase + famOff;
|
|
aOverlay->overlaySrcLen = famLen;
|
|
aOverlay->overlayDest = nameOffset + nameStringsBase + fullOff;
|
|
}
|
|
|
|
// -- OS/2 table data
|
|
const OS2Table *os2Data = reinterpret_cast<const OS2Table*>(aFontData + os2Offset);
|
|
|
|
memcpy(eotHeader->panose, os2Data->panose, sizeof(eotHeader->panose));
|
|
|
|
eotHeader->italic = (uint16_t) os2Data->fsSelection & 0x01;
|
|
eotHeader->weight = os2Data->usWeightClass;
|
|
eotHeader->unicodeRange1 = os2Data->unicodeRange1;
|
|
eotHeader->unicodeRange2 = os2Data->unicodeRange2;
|
|
eotHeader->unicodeRange3 = os2Data->unicodeRange3;
|
|
eotHeader->unicodeRange4 = os2Data->unicodeRange4;
|
|
eotHeader->codePageRange1 = os2Data->codePageRange1;
|
|
eotHeader->codePageRange2 = os2Data->codePageRange2;
|
|
|
|
eotHeader->eotSize = aHeader->Length() + fontDataSize;
|
|
|
|
// DumpEOTHeader(aHeader->Elements(), aHeader->Length());
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
/* static */
|
|
bool
|
|
gfxFontUtils::IsCffFont(const uint8_t* aFontData, bool& hasVertical)
|
|
{
|
|
// this is only called after aFontData has passed basic validation,
|
|
// so we know there is enough data present to allow us to read the version!
|
|
const SFNTHeader *sfntHeader = reinterpret_cast<const SFNTHeader*>(aFontData);
|
|
|
|
uint32_t i;
|
|
uint32_t numTables = sfntHeader->numTables;
|
|
const TableDirEntry *dirEntry =
|
|
reinterpret_cast<const TableDirEntry*>(aFontData + sizeof(SFNTHeader));
|
|
hasVertical = false;
|
|
for (i = 0; i < numTables; i++, dirEntry++) {
|
|
if (dirEntry->tag == TRUETYPE_TAG('v','h','e','a')) {
|
|
hasVertical = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return (sfntHeader->sfntVersion == TRUETYPE_TAG('O','T','T','O'));
|
|
}
|
|
|
|
#endif
|