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gecko-dev/gfx/thebes/gfxFontUtils.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is thebes gfx code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2007-2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Stuart Parmenter <stuart@mozilla.com>
* John Daggett <jdaggett@mozilla.com>
* Jonathan Kew <jfkthame@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "gfxFontUtils.h"
#include "nsServiceManagerUtils.h"
#include "nsIPrefBranch.h"
#include "nsIPrefService.h"
#include "nsIPrefLocalizedString.h"
#include "nsISupportsPrimitives.h"
#include "nsIStreamBufferAccess.h"
#include "nsIUUIDGenerator.h"
#include "nsMemory.h"
#include "nsICharsetConverterManager.h"
#include "plbase64.h"
#include "woff.h"
#ifdef XP_MACOSX
#include <CoreFoundation/CoreFoundation.h>
#endif
#define NO_RANGE_FOUND 126 // bit 126 in the font unicode ranges is required to be 0
#define UNICODE_BMP_LIMIT 0x10000
using namespace mozilla; // for the AutoSwap_* types
/* Unicode subrange table
* from: http://msdn.microsoft.com/en-us/library/dd374090
*
* Edit the text to extend the initial digit, then use something like:
* 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
* to generate the below list.
*/
struct UnicodeRangeTableEntry
{
PRUint8 bit;
PRUint32 start;
PRUint32 end;
const char *info;
};
static struct UnicodeRangeTableEntry gUnicodeRanges[] = {
{ 0, 0x0000, 0x007F, "Basic Latin" },
{ 1, 0x0080, 0x00FF, "Latin-1 Supplement" },
{ 2, 0x0100, 0x017F, "Latin Extended-A" },
{ 3, 0x0180, 0x024F, "Latin Extended-B" },
{ 4, 0x0250, 0x02AF, "IPA Extensions" },
{ 4, 0x1D00, 0x1D7F, "Phonetic Extensions" },
{ 4, 0x1D80, 0x1DBF, "Phonetic Extensions Supplement" },
{ 5, 0x02B0, 0x02FF, "Spacing Modifier Letters" },
{ 5, 0xA700, 0xA71F, "Modifier Tone Letters" },
{ 6, 0x0300, 0x036F, "Combining Diacritical Marks" },
{ 6, 0x1DC0, 0x1DFF, "Combining Diacritical Marks Supplement" },
{ 7, 0x0370, 0x03FF, "Greek and Coptic" },
{ 8, 0x2C80, 0x2CFF, "Coptic" },
{ 9, 0x0400, 0x04FF, "Cyrillic" },
{ 9, 0x0500, 0x052F, "Cyrillic Supplement" },
{ 9, 0x2DE0, 0x2DFF, "Cyrillic Extended-A" },
{ 9, 0xA640, 0xA69F, "Cyrillic Extended-B" },
{ 10, 0x0530, 0x058F, "Armenian" },
{ 11, 0x0590, 0x05FF, "Hebrew" },
{ 12, 0xA500, 0xA63F, "Vai" },
{ 13, 0x0600, 0x06FF, "Arabic" },
{ 13, 0x0750, 0x077F, "Arabic Supplement" },
{ 14, 0x07C0, 0x07FF, "NKo" },
{ 15, 0x0900, 0x097F, "Devanagari" },
{ 16, 0x0980, 0x09FF, "Bengali" },
{ 17, 0x0A00, 0x0A7F, "Gurmukhi" },
{ 18, 0x0A80, 0x0AFF, "Gujarati" },
{ 19, 0x0B00, 0x0B7F, "Oriya" },
{ 20, 0x0B80, 0x0BFF, "Tamil" },
{ 21, 0x0C00, 0x0C7F, "Telugu" },
{ 22, 0x0C80, 0x0CFF, "Kannada" },
{ 23, 0x0D00, 0x0D7F, "Malayalam" },
{ 24, 0x0E00, 0x0E7F, "Thai" },
{ 25, 0x0E80, 0x0EFF, "Lao" },
{ 26, 0x10A0, 0x10FF, "Georgian" },
{ 26, 0x2D00, 0x2D2F, "Georgian Supplement" },
{ 27, 0x1B00, 0x1B7F, "Balinese" },
{ 28, 0x1100, 0x11FF, "Hangul Jamo" },
{ 29, 0x1E00, 0x1EFF, "Latin Extended Additional" },
{ 29, 0x2C60, 0x2C7F, "Latin Extended-C" },
{ 29, 0xA720, 0xA7FF, "Latin Extended-D" },
{ 30, 0x1F00, 0x1FFF, "Greek Extended" },
{ 31, 0x2000, 0x206F, "General Punctuation" },
{ 31, 0x2E00, 0x2E7F, "Supplemental Punctuation" },
{ 32, 0x2070, 0x209F, "Superscripts And Subscripts" },
{ 33, 0x20A0, 0x20CF, "Currency Symbols" },
{ 34, 0x20D0, 0x20FF, "Combining Diacritical Marks For Symbols" },
{ 35, 0x2100, 0x214F, "Letterlike Symbols" },
{ 36, 0x2150, 0x218F, "Number Forms" },
{ 37, 0x2190, 0x21FF, "Arrows" },
{ 37, 0x27F0, 0x27FF, "Supplemental Arrows-A" },
{ 37, 0x2900, 0x297F, "Supplemental Arrows-B" },
{ 37, 0x2B00, 0x2BFF, "Miscellaneous Symbols and Arrows" },
{ 38, 0x2200, 0x22FF, "Mathematical Operators" },
{ 38, 0x27C0, 0x27EF, "Miscellaneous Mathematical Symbols-A" },
{ 38, 0x2980, 0x29FF, "Miscellaneous Mathematical Symbols-B" },
{ 38, 0x2A00, 0x2AFF, "Supplemental Mathematical Operators" },
{ 39, 0x2300, 0x23FF, "Miscellaneous Technical" },
{ 40, 0x2400, 0x243F, "Control Pictures" },
{ 41, 0x2440, 0x245F, "Optical Character Recognition" },
{ 42, 0x2460, 0x24FF, "Enclosed Alphanumerics" },
{ 43, 0x2500, 0x257F, "Box Drawing" },
{ 44, 0x2580, 0x259F, "Block Elements" },
{ 45, 0x25A0, 0x25FF, "Geometric Shapes" },
{ 46, 0x2600, 0x26FF, "Miscellaneous Symbols" },
{ 47, 0x2700, 0x27BF, "Dingbats" },
{ 48, 0x3000, 0x303F, "CJK Symbols And Punctuation" },
{ 49, 0x3040, 0x309F, "Hiragana" },
{ 50, 0x30A0, 0x30FF, "Katakana" },
{ 50, 0x31F0, 0x31FF, "Katakana Phonetic Extensions" },
{ 51, 0x3100, 0x312F, "Bopomofo" },
{ 50, 0x31A0, 0x31BF, "Bopomofo Extended" },
{ 52, 0x3130, 0x318F, "Hangul Compatibility Jamo" },
{ 53, 0xA840, 0xA87F, "Phags-pa" },
{ 54, 0x3200, 0x32FF, "Enclosed CJK Letters And Months" },
{ 55, 0x3300, 0x33FF, "CJK Compatibility" },
{ 56, 0xAC00, 0xD7AF, "Hangul Syllables" },
{ 57, 0xD800, 0xDFFF, "Non-Plane 0" },
{ 58, 0x10900, 0x1091F, "Phoenician" },
{ 59, 0x2E80, 0x2EFF, "CJK Radicals Supplement" },
{ 59, 0x2F00, 0x2FDF, "Kangxi Radicals" },
{ 59, 0x2FF0, 0x2FFF, "Ideographic Description Characters" },
{ 59, 0x3190, 0x319F, "Kanbun" },
{ 59, 0x3400, 0x4DBF, "CJK Unified Ideographs Extension A" },
{ 59, 0x4E00, 0x9FFF, "CJK Unified Ideographs" },
{ 59, 0x20000, 0x2A6DF, "CJK Unified Ideographs Extension B" },
{ 60, 0xE000, 0xF8FF, "Private Use Area" },
{ 61, 0x31C0, 0x31EF, "CJK Strokes" },
{ 61, 0xF900, 0xFAFF, "CJK Compatibility Ideographs" },
{ 61, 0x2F800, 0x2FA1F, "CJK Compatibility Ideographs Supplement" },
{ 62, 0xFB00, 0xFB4F, "Alphabetic Presentation Forms" },
{ 63, 0xFB50, 0xFDFF, "Arabic Presentation Forms-A" },
{ 64, 0xFE20, 0xFE2F, "Combining Half Marks" },
{ 65, 0xFE10, 0xFE1F, "Vertical Forms" },
{ 65, 0xFE30, 0xFE4F, "CJK Compatibility Forms" },
{ 66, 0xFE50, 0xFE6F, "Small Form Variants" },
{ 67, 0xFE70, 0xFEFF, "Arabic Presentation Forms-B" },
{ 68, 0xFF00, 0xFFEF, "Halfwidth And Fullwidth Forms" },
{ 69, 0xFFF0, 0xFFFF, "Specials" },
{ 70, 0x0F00, 0x0FFF, "Tibetan" },
{ 71, 0x0700, 0x074F, "Syriac" },
{ 72, 0x0780, 0x07BF, "Thaana" },
{ 73, 0x0D80, 0x0DFF, "Sinhala" },
{ 74, 0x1000, 0x109F, "Myanmar" },
{ 75, 0x1200, 0x137F, "Ethiopic" },
{ 75, 0x1380, 0x139F, "Ethiopic Supplement" },
{ 75, 0x2D80, 0x2DDF, "Ethiopic Extended" },
{ 76, 0x13A0, 0x13FF, "Cherokee" },
{ 77, 0x1400, 0x167F, "Unified Canadian Aboriginal Syllabics" },
{ 78, 0x1680, 0x169F, "Ogham" },
{ 79, 0x16A0, 0x16FF, "Runic" },
{ 80, 0x1780, 0x17FF, "Khmer" },
{ 80, 0x19E0, 0x19FF, "Khmer Symbols" },
{ 81, 0x1800, 0x18AF, "Mongolian" },
{ 82, 0x2800, 0x28FF, "Braille Patterns" },
{ 83, 0xA000, 0xA48F, "Yi Syllables" },
{ 83, 0xA490, 0xA4CF, "Yi Radicals" },
{ 84, 0x1700, 0x171F, "Tagalog" },
{ 84, 0x1720, 0x173F, "Hanunoo" },
{ 84, 0x1740, 0x175F, "Buhid" },
{ 84, 0x1760, 0x177F, "Tagbanwa" },
{ 85, 0x10300, 0x1032F, "Old Italic" },
{ 86, 0x10330, 0x1034F, "Gothic" },
{ 87, 0x10400, 0x1044F, "Deseret" },
{ 88, 0x1D000, 0x1D0FF, "Byzantine Musical Symbols" },
{ 88, 0x1D100, 0x1D1FF, "Musical Symbols" },
{ 88, 0x1D200, 0x1D24F, "Ancient Greek Musical Notation" },
{ 89, 0x1D400, 0x1D7FF, "Mathematical Alphanumeric Symbols" },
{ 90, 0xFF000, 0xFFFFD, "Private Use (plane 15)" },
{ 90, 0x100000, 0x10FFFD, "Private Use (plane 16)" },
{ 91, 0xFE00, 0xFE0F, "Variation Selectors" },
{ 91, 0xE0100, 0xE01EF, "Variation Selectors Supplement" },
{ 92, 0xE0000, 0xE007F, "Tags" },
{ 93, 0x1900, 0x194F, "Limbu" },
{ 94, 0x1950, 0x197F, "Tai Le" },
{ 95, 0x1980, 0x19DF, "New Tai Lue" },
{ 96, 0x1A00, 0x1A1F, "Buginese" },
{ 97, 0x2C00, 0x2C5F, "Glagolitic" },
{ 98, 0x2D30, 0x2D7F, "Tifinagh" },
{ 99, 0x4DC0, 0x4DFF, "Yijing Hexagram Symbols" },
{ 100, 0xA800, 0xA82F, "Syloti Nagri" },
{ 101, 0x10000, 0x1007F, "Linear B Syllabary" },
{ 101, 0x10080, 0x100FF, "Linear B Ideograms" },
{ 101, 0x10100, 0x1013F, "Aegean Numbers" },
{ 102, 0x10140, 0x1018F, "Ancient Greek Numbers" },
{ 103, 0x10380, 0x1039F, "Ugaritic" },
{ 104, 0x103A0, 0x103DF, "Old Persian" },
{ 105, 0x10450, 0x1047F, "Shavian" },
{ 106, 0x10480, 0x104AF, "Osmanya" },
{ 107, 0x10800, 0x1083F, "Cypriot Syllabary" },
{ 108, 0x10A00, 0x10A5F, "Kharoshthi" },
{ 109, 0x1D300, 0x1D35F, "Tai Xuan Jing Symbols" },
{ 110, 0x12000, 0x123FF, "Cuneiform" },
{ 110, 0x12400, 0x1247F, "Cuneiform Numbers and Punctuation" },
{ 111, 0x1D360, 0x1D37F, "Counting Rod Numerals" },
{ 112, 0x1B80, 0x1BBF, "Sundanese" },
{ 113, 0x1C00, 0x1C4F, "Lepcha" },
{ 114, 0x1C50, 0x1C7F, "Ol Chiki" },
{ 115, 0xA880, 0xA8DF, "Saurashtra" },
{ 116, 0xA900, 0xA92F, "Kayah Li" },
{ 117, 0xA930, 0xA95F, "Rejang" },
{ 118, 0xAA00, 0xAA5F, "Cham" },
{ 119, 0x10190, 0x101CF, "Ancient Symbols" },
{ 120, 0x101D0, 0x101FF, "Phaistos Disc" },
{ 121, 0x10280, 0x1029F, "Lycian" },
{ 121, 0x102A0, 0x102DF, "Carian" },
{ 121, 0x10920, 0x1093F, "Lydian" },
{ 122, 0x1F000, 0x1F02F, "Mahjong Tiles" },
{ 122, 0x1F030, 0x1F09F, "Domino Tiles" }
};
#pragma pack(1)
typedef struct {
AutoSwap_PRUint16 format;
AutoSwap_PRUint16 reserved;
AutoSwap_PRUint32 length;
AutoSwap_PRUint32 language;
AutoSwap_PRUint32 numGroups;
} Format12CmapHeader;
typedef struct {
AutoSwap_PRUint32 startCharCode;
AutoSwap_PRUint32 endCharCode;
AutoSwap_PRUint32 startGlyphId;
} Format12Group;
#pragma pack()
nsresult
gfxFontUtils::ReadCMAPTableFormat12(const PRUint8 *aBuf, PRUint32 aLength,
gfxSparseBitSet& aCharacterMap)
{
// Ensure table is large enough that we can safely read the header
NS_ENSURE_TRUE(aLength >= sizeof(Format12CmapHeader),
NS_ERROR_GFX_CMAP_MALFORMED);
// Sanity-check header fields
const Format12CmapHeader *cmap12 =
reinterpret_cast<const Format12CmapHeader*>(aBuf);
NS_ENSURE_TRUE(PRUint16(cmap12->format) == 12,
NS_ERROR_GFX_CMAP_MALFORMED);
NS_ENSURE_TRUE(PRUint16(cmap12->reserved) == 0,
NS_ERROR_GFX_CMAP_MALFORMED);
PRUint32 tablelen = cmap12->length;
NS_ENSURE_TRUE(tablelen >= sizeof(Format12CmapHeader) &&
tablelen <= aLength, NS_ERROR_GFX_CMAP_MALFORMED);
NS_ENSURE_TRUE(cmap12->language == 0, NS_ERROR_GFX_CMAP_MALFORMED);
// Check that the table is large enough for the group array
const PRUint32 numGroups = cmap12->numGroups;
NS_ENSURE_TRUE((tablelen - sizeof(Format12CmapHeader)) /
sizeof(Format12Group) >= numGroups,
NS_ERROR_GFX_CMAP_MALFORMED);
// The array of groups immediately follows the subtable header.
const Format12Group *group =
reinterpret_cast<const Format12Group*>(aBuf + sizeof(Format12CmapHeader));
// Check that groups are in correct order and do not overlap,
// and record character coverage in aCharacterMap.
PRUint32 prevEndCharCode = 0;
for (PRUint32 i = 0; i < numGroups; i++, group++) {
const PRUint32 startCharCode = group->startCharCode;
const PRUint32 endCharCode = group->endCharCode;
NS_ENSURE_TRUE((prevEndCharCode < startCharCode || i == 0) &&
startCharCode <= endCharCode &&
endCharCode <= CMAP_MAX_CODEPOINT,
NS_ERROR_GFX_CMAP_MALFORMED);
aCharacterMap.SetRange(startCharCode, endCharCode);
prevEndCharCode = endCharCode;
}
aCharacterMap.mBlocks.Compact();
return NS_OK;
}
nsresult
gfxFontUtils::ReadCMAPTableFormat4(const PRUint8 *aBuf, PRUint32 aLength,
gfxSparseBitSet& aCharacterMap)
{
enum {
OffsetFormat = 0,
OffsetLength = 2,
OffsetLanguage = 4,
OffsetSegCountX2 = 6
};
NS_ENSURE_TRUE(ReadShortAt(aBuf, OffsetFormat) == 4,
NS_ERROR_GFX_CMAP_MALFORMED);
PRUint16 tablelen = ReadShortAt(aBuf, OffsetLength);
NS_ENSURE_TRUE(tablelen <= aLength, NS_ERROR_GFX_CMAP_MALFORMED);
NS_ENSURE_TRUE(tablelen > 16, NS_ERROR_GFX_CMAP_MALFORMED);
// This field should normally (except for Mac platform subtables) be zero according to
// the OT spec, but some buggy fonts have lang = 1 (which would be English for MacOS).
// E.g. Arial Narrow Bold, v. 1.1 (Tiger), Arial Unicode MS (see bug 530614).
// 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);
PRUint16 segCountX2 = ReadShortAt(aBuf, OffsetSegCountX2);
NS_ENSURE_TRUE(tablelen >= 16 + (segCountX2 * 4),
NS_ERROR_GFX_CMAP_MALFORMED);
const PRUint16 segCount = segCountX2 / 2;
const PRUint16 *endCounts = reinterpret_cast<const PRUint16*>(aBuf + 14);
const PRUint16 *startCounts = endCounts + 1 /* skip one uint16 for reservedPad */ + segCount;
const PRUint16 *idDeltas = startCounts + segCount;
const PRUint16 *idRangeOffsets = idDeltas + segCount;
PRUint16 prevEndCount = 0;
for (PRUint16 i = 0; i < segCount; i++) {
const PRUint16 endCount = ReadShortAt16(endCounts, i);
const PRUint16 startCount = ReadShortAt16(startCounts, i);
const PRUint16 idRangeOffset = ReadShortAt16(idRangeOffsets, i);
// sanity-check range
NS_ENSURE_TRUE((startCount > prevEndCount || i == 0 || startCount == 0xFFFF) &&
startCount <= endCount,
NS_ERROR_GFX_CMAP_MALFORMED);
prevEndCount = endCount;
if (idRangeOffset == 0) {
aCharacterMap.SetRange(startCount, endCount);
} else {
// const PRUint16 idDelta = ReadShortAt16(idDeltas, i); // Unused: self-documenting.
for (PRUint32 c = startCount; c <= endCount; ++c) {
if (c == 0xFFFF)
break;
const PRUint16 *gdata = (idRangeOffset/2
+ (c - startCount)
+ &idRangeOffsets[i]);
NS_ENSURE_TRUE((PRUint8*)gdata > aBuf &&
(PRUint8*)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.mBlocks.Compact();
return NS_OK;
}
nsresult
gfxFontUtils::ReadCMAPTableFormat14(const PRUint8 *aBuf, PRUint32 aLength,
PRUint8*& 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);
PRUint32 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 PRUint32 numVarSelectorRecords = ReadLongAt(aBuf, OffsetNumVarSelectorRecords);
NS_ENSURE_TRUE((tablelen - OffsetVarSelectorRecords) /
SizeOfVarSelectorRecord >= numVarSelectorRecords,
NS_ERROR_GFX_CMAP_MALFORMED);
const PRUint8 *records = aBuf + OffsetVarSelectorRecords;
for (PRUint32 i = 0; i < numVarSelectorRecords;
i++, records += SizeOfVarSelectorRecord) {
const PRUint32 varSelector = ReadUint24At(records, VSRecOffsetVarSelector);
const PRUint32 defUVSOffset = ReadLongAt(records, VSRecOffsetDefUVSOffset);
const PRUint32 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 PRUint32 numUnicodeValueRanges = ReadLongAt(aBuf, defUVSOffset);
NS_ENSURE_TRUE((tablelen - defUVSOffset) /
SizeOfDefUVSTable >= numUnicodeValueRanges,
NS_ERROR_GFX_CMAP_MALFORMED);
const PRUint8 *tables = aBuf + defUVSOffset + 4;
PRUint32 prevEndUnicode = 0;
for (PRUint32 j = 0; j < numUnicodeValueRanges; j++, tables += SizeOfDefUVSTable) {
const PRUint32 startUnicode = ReadUint24At(tables, DefUVSOffsetStartUnicodeValue);
const PRUint32 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 PRUint32 numUVSMappings = ReadLongAt(aBuf, nonDefUVSOffset);
NS_ENSURE_TRUE((tablelen - nonDefUVSOffset) /
SizeOfNonDefUVSTable >= numUVSMappings,
NS_ERROR_GFX_CMAP_MALFORMED);
const PRUint8 *tables = aBuf + nonDefUVSOffset + 4;
PRUint32 prevUnicode = 0;
for (PRUint32 j = 0; j < numUVSMappings; j++, tables += SizeOfNonDefUVSTable) {
const PRUint32 unicodeValue = ReadUint24At(tables, NonDefUVSOffsetUnicodeValue);
NS_ENSURE_TRUE((prevUnicode < unicodeValue || j == 0) &&
unicodeValue <= CMAP_MAX_CODEPOINT,
NS_ERROR_GFX_CMAP_MALFORMED);
prevUnicode = unicodeValue;
}
}
}
aTable = new PRUint8[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)
PRUint32
gfxFontUtils::FindPreferredSubtable(const PRUint8 *aBuf, PRUint32 aBufLength,
PRUint32 *aTableOffset,
PRUint32 *aUVSTableOffset,
PRBool *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 = nsnull;
}
if (!aBuf || aBufLength < SizeOfHeader) {
// cmap table is missing, or too small to contain header fields!
return 0;
}
// PRUint16 version = ReadShortAt(aBuf, OffsetVersion); // Unused: self-documenting.
PRUint16 numTables = ReadShortAt(aBuf, OffsetNumTables);
if (aBufLength < PRUint32(SizeOfHeader + numTables * SizeOfTable)) {
return 0;
}
// save the format we want here
PRUint32 keepFormat = 0;
const PRUint8 *table = aBuf + SizeOfHeader;
for (PRUint16 i = 0; i < numTables; ++i, table += SizeOfTable) {
const PRUint16 platformID = ReadShortAt(table, TableOffsetPlatformID);
if (!acceptablePlatform(platformID))
continue;
const PRUint16 encodingID = ReadShortAt(table, TableOffsetEncodingID);
const PRUint32 offset = ReadLongAt(table, TableOffsetOffset);
if (aBufLength - 2 < offset) {
// this subtable is not valid - beyond end of buffer
return 0;
}
const PRUint8 *subtable = aBuf + offset;
const PRUint16 format = ReadShortAt(subtable, SubtableOffsetFormat);
if (isSymbol(platformID, encodingID)) {
keepFormat = format;
*aTableOffset = offset;
*aSymbolEncoding = PR_TRUE;
break;
} else if (format == 4 && acceptableFormat4(platformID, encodingID, keepFormat)) {
keepFormat = format;
*aTableOffset = offset;
*aSymbolEncoding = PR_FALSE;
} else if (format == 12 && acceptableUCS4Encoding(platformID, encodingID, keepFormat)) {
keepFormat = format;
*aTableOffset = offset;
*aSymbolEncoding = PR_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 PRUint8 *aBuf, PRUint32 aBufLength,
gfxSparseBitSet& aCharacterMap,
PRUint32& aUVSOffset,
PRPackedBool& aUnicodeFont, PRPackedBool& aSymbolFont)
{
PRUint32 offset;
PRBool symbol;
PRUint32 format = FindPreferredSubtable(aBuf, aBufLength,
&offset, &aUVSOffset, &symbol);
if (format == 4) {
if (symbol) {
aUnicodeFont = PR_FALSE;
aSymbolFont = PR_TRUE;
} else {
aUnicodeFont = PR_TRUE;
aSymbolFont = PR_FALSE;
}
return ReadCMAPTableFormat4(aBuf + offset, aBufLength - offset,
aCharacterMap);
}
if (format == 12) {
aUnicodeFont = PR_TRUE;
aSymbolFont = PR_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()
PRUint32
gfxFontUtils::MapCharToGlyphFormat4(const PRUint8 *aBuf, PRUnichar aCh)
{
const Format4Cmap *cmap4 = reinterpret_cast<const Format4Cmap*>(aBuf);
PRUint16 segCount;
const AutoSwap_PRUint16 *endCodes;
const AutoSwap_PRUint16 *startCodes;
const AutoSwap_PRUint16 *idDelta;
const AutoSwap_PRUint16 *idRangeOffset;
PRUint16 probe;
PRUint16 rangeShiftOver2;
PRUint16 index;
segCount = (PRUint16)(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 << (PRUint16)(cmap4->entrySelector);
rangeShiftOver2 = (PRUint16)(cmap4->rangeShift) / 2;
if ((PRUint16)(startCodes[rangeShiftOver2]) <= aCh) {
index = rangeShiftOver2;
} else {
index = 0;
}
while (probe > 1) {
probe >>= 1;
if ((PRUint16)(startCodes[index + probe]) <= aCh) {
index += probe;
}
}
if (aCh >= (PRUint16)(startCodes[index]) && aCh <= (PRUint16)(endCodes[index])) {
PRUint16 result;
if ((PRUint16)(idRangeOffset[index]) == 0) {
result = aCh;
} else {
PRUint16 offset = aCh - (PRUint16)(startCodes[index]);
const AutoSwap_PRUint16 *glyphIndexTable =
(const AutoSwap_PRUint16*)((const char*)&idRangeOffset[index] +
(PRUint16)(idRangeOffset[index]));
result = glyphIndexTable[offset];
}
// note that this is unsigned 16-bit arithmetic, and may wrap around
result += (PRUint16)(idDelta[index]);
return result;
}
return 0;
}
PRUint32
gfxFontUtils::MapCharToGlyphFormat12(const PRUint8 *aBuf, PRUint32 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.
PRUint32 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.
PRUint32 powerOf2 = mozilla::FindHighestBit(numGroups);
PRUint32 rangeOffset = numGroups - powerOf2;
PRUint32 range = 0;
PRUint32 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;
}
PRUint16
gfxFontUtils::MapUVSToGlyphFormat14(const PRUint8 *aBuf, PRUint32 aCh, PRUint32 aVS)
{
const Format14Cmap *cmap14 = reinterpret_cast<const Format14Cmap*>(aBuf);
// binary search in varSelectorRecords
PRUint32 min = 0;
PRUint32 max = cmap14->numVarSelectorRecords;
PRUint32 nonDefUVSOffset = 0;
while (min < max) {
PRUint32 index = (min + max) >> 1;
PRUint32 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) {
PRUint32 index = (min + max) >> 1;
PRUint32 unicodeValue = table->uvsMappings[index].unicodeValue;
if (aCh == unicodeValue) {
return table->uvsMappings[index].glyphID;
}
if (aCh < unicodeValue) {
max = index;
} else {
min = index + 1;
}
}
return 0;
}
PRUint32
gfxFontUtils::MapCharToGlyph(const PRUint8 *aBuf, PRUint32 aBufLength,
PRUint32 aCh)
{
PRUint32 offset;
PRBool symbol;
PRUint32 format = FindPreferredSubtable(aBuf, aBufLength, &offset,
nsnull, &symbol);
switch (format) {
case 4:
return aCh < UNICODE_BMP_LIMIT ?
MapCharToGlyphFormat4(aBuf + offset, PRUnichar(aCh)) : 0;
case 12:
return MapCharToGlyphFormat12(aBuf + offset, aCh);
default:
return 0;
}
}
PRUint8 gfxFontUtils::CharRangeBit(PRUint32 ch) {
const PRUint32 n = sizeof(gUnicodeRanges) / sizeof(struct UnicodeRangeTableEntry);
for (PRUint32 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
nsCOMPtr<nsIPrefBranch> prefs(do_GetService(NS_PREFSERVICE_CONTRACTID));
nsAutoString fontlistValue;
if (prefs) {
nsCOMPtr<nsISupportsString> prefString;
prefs->GetComplexValue(aPrefName, NS_GET_IID(nsISupportsString), getter_AddRefs(prefString));
if (!prefString)
return;
prefString->GetData(fontlistValue);
}
// append each font name to the list
nsAutoString fontname;
nsPromiseFlatString fonts(fontlistValue);
const PRUnichar *p, *p_end;
fonts.BeginReading(p);
fonts.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(PR_TRUE, PR_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 {
PRUint32 offset;
PRUint32 length;
};
#pragma pack()
static PRBool
IsValidSFNTVersion(PRUint32 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 PRUint16 *aInBuf, PRUint16 *aOutBuf, PRUint32 aLen)
{
const PRUint16 *end = aInBuf + aLen;
while (aInBuf < end) {
PRUint16 value = *aInBuf;
*aOutBuf = (value >> 8) | (value & 0xff) << 8;
aOutBuf++;
aInBuf++;
}
}
static PRBool
ValidateKernTable(const PRUint8 *aKernTable, PRUint32 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 PR_FALSE;
}
if (PRUint16(kernTable0->version) == 0) {
if (aKernLength < sizeof(KernTableVersion0) +
PRUint16(kernTable0->nTables) * sizeof(KernTableSubtableHeaderVersion0)) {
return PR_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 PR_TRUE;
}
const KernTableVersion1 *kernTable1 = reinterpret_cast<const KernTableVersion1*>(aKernTable);
if (aKernLength < sizeof(KernTableVersion1)) {
return PR_FALSE;
}
if (kernTable1->version == 0x00010000) {
if (aKernLength < sizeof(KernTableVersion1) +
kernTable1->nTables * sizeof(KernTableSubtableHeaderVersion1)) {
return PR_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 PR_TRUE;
}
// neither the old Windows version nor the newer Apple one; refuse to use it
return PR_FALSE;
}
static PRBool
ValidateLocaTable(const PRUint8* aLocaTable, PRUint32 aLocaLen,
PRUint32 aGlyfLen, PRInt16 aLocaFormat, PRUint16 aNumGlyphs)
{
if (aLocaFormat == 0) {
if (aLocaLen < PRUint32(aNumGlyphs + 1) * sizeof(PRUint16)) {
return PR_FALSE;
}
const AutoSwap_PRUint16 *p =
reinterpret_cast<const AutoSwap_PRUint16*>(aLocaTable);
PRUint32 prev = 0;
for (PRUint32 i = 0; i <= aNumGlyphs; ++i) {
PRUint32 current = PRUint16(*p++) * 2;
if (current < prev || current > aGlyfLen) {
return PR_FALSE;
}
prev = current;
}
return PR_TRUE;
}
if (aLocaFormat == 1) {
if (aLocaLen < (aNumGlyphs + 1) * sizeof(PRUint32)) {
return PR_FALSE;
}
const AutoSwap_PRUint32 *p =
reinterpret_cast<const AutoSwap_PRUint32*>(aLocaTable);
PRUint32 prev = 0;
for (PRUint32 i = 0; i <= aNumGlyphs; ++i) {
PRUint32 current = *p++;
if (current < prev || current > aGlyfLen) {
return PR_FALSE;
}
prev = current;
}
return PR_TRUE;
}
return PR_FALSE;
}
gfxUserFontType
gfxFontUtils::DetermineFontDataType(const PRUint8 *aFontData, PRUint32 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);
PRUint32 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 (PRUint32(*version) == TRUETYPE_TAG('w','O','F','F')) {
return GFX_USERFONT_WOFF;
}
}
// tests for other formats here
return GFX_USERFONT_UNKNOWN;
}
PRBool
gfxFontUtils::ValidateSFNTHeaders(const PRUint8 *aFontData,
PRUint32 aFontDataLength)
{
NS_ASSERTION(aFontData, "null font data");
PRUint64 dataLength(aFontDataLength);
// read in the sfnt header
if (sizeof(SFNTHeader) > aFontDataLength) {
NS_WARNING("invalid font (insufficient data)");
return PR_FALSE;
}
const SFNTHeader *sfntHeader = reinterpret_cast<const SFNTHeader*>(aFontData);
PRUint32 sfntVersion = sfntHeader->sfntVersion;
if (!IsValidSFNTVersion(sfntVersion)) {
NS_WARNING("invalid font (SFNT version)");
return PR_FALSE;
}
// iterate through the table headers to find the head, name and OS/2 tables
PRBool foundHead = PR_FALSE, foundOS2 = PR_FALSE, foundName = PR_FALSE;
PRBool foundGlyphs = PR_FALSE, foundCFF = PR_FALSE, foundKern = PR_FALSE;
PRBool foundLoca = PR_FALSE, foundMaxp = PR_FALSE;
PRUint32 headOffset = 0, headLen, nameOffset = 0, nameLen, kernOffset = 0,
kernLen = 0, glyfLen = 0, locaOffset = 0, locaLen = 0,
maxpOffset = 0, maxpLen;
PRUint32 i, numTables;
numTables = sfntHeader->numTables;
PRUint32 headerLen = sizeof(SFNTHeader) + sizeof(TableDirEntry) * numTables;
if (headerLen > aFontDataLength) {
NS_WARNING("invalid font (table directory)");
return PR_FALSE;
}
// table directory entries begin immediately following SFNT header
const TableDirEntry *dirEntry =
reinterpret_cast<const TableDirEntry*>(aFontData + sizeof(SFNTHeader));
PRUint32 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 (PRUint64(dirEntry->offset) + PRUint64(dirEntry->length) > dataLength) {
NS_WARNING("invalid font (table directory entry)");
return PR_FALSE;
}
checksum += dirEntry->checkSum;
switch (dirEntry->tag) {
case TRUETYPE_TAG('h','e','a','d'):
foundHead = PR_TRUE;
headOffset = dirEntry->offset;
headLen = dirEntry->length;
if (headLen < sizeof(HeadTable)) {
NS_WARNING("invalid font (head table length)");
return PR_FALSE;
}
break;
case TRUETYPE_TAG('k','e','r','n'):
foundKern = PR_TRUE;
kernOffset = dirEntry->offset;
kernLen = dirEntry->length;
break;
case TRUETYPE_TAG('n','a','m','e'):
foundName = PR_TRUE;
nameOffset = dirEntry->offset;
nameLen = dirEntry->length;
break;
case TRUETYPE_TAG('O','S','/','2'):
foundOS2 = PR_TRUE;
break;
case TRUETYPE_TAG('g','l','y','f'): // TrueType-style quadratic glyph table
foundGlyphs = PR_TRUE;
glyfLen = dirEntry->length;
break;
case TRUETYPE_TAG('l','o','c','a'): // glyph location table
foundLoca = PR_TRUE;
locaOffset = dirEntry->offset;
locaLen = dirEntry->length;
break;
case TRUETYPE_TAG('m','a','x','p'): // max profile
foundMaxp = PR_TRUE;
maxpOffset = dirEntry->offset;
maxpLen = dirEntry->length;
if (maxpLen < sizeof(MaxpTableHeader)) {
NS_WARNING("invalid font (maxp table length)");
return PR_FALSE;
}
break;
case TRUETYPE_TAG('C','F','F',' '): // PS-style cubic glyph table
foundCFF = PR_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 PR_FALSE;
}
// -- on Windows need OS/2 table
#ifdef XP_WIN
if (!foundOS2) {
NS_WARNING("invalid font (missing OS/2 table)");
return PR_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 PR_FALSE;
}
if (headData->magicNumber != HeadTable::HEAD_MAGIC_NUMBER) {
NS_WARNING("invalid font (head magic number)");
return PR_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 PR_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 PR_FALSE;
}
} else {
if (!foundGlyphs || !foundLoca) {
NS_WARNING("invalid font (missing glyf or loca table)");
return PR_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 PR_FALSE;
}
}
// -- name table data
const NameHeader *nameHeader = reinterpret_cast<const NameHeader*>(aFontData + nameOffset);
PRUint32 nameCount = nameHeader->count;
// -- sanity check the number of name records
if (PRUint64(nameCount) * sizeof(NameRecord) + PRUint64(nameOffset) > dataLength) {
NS_WARNING("invalid font (name records)");
return PR_FALSE;
}
// -- iterate through name records
const NameRecord *nameRecord = reinterpret_cast<const NameRecord*>
(aFontData + nameOffset + sizeof(NameHeader));
PRUint64 nameStringsBase = PRUint64(nameOffset) + PRUint64(nameHeader->stringOffset);
for (i = 0; i < nameCount; i++, nameRecord++) {
PRUint32 namelen = nameRecord->length;
PRUint32 nameoff = nameRecord->offset; // offset from base of string storage
if (nameStringsBase + PRUint64(nameoff) + PRUint64(namelen) > dataLength) {
NS_WARNING("invalid font (name table strings)");
return PR_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 PR_FALSE;
}
}
// everything seems consistent
return PR_TRUE;
}
nsresult
gfxFontUtils::RenameFont(const nsAString& aName, const PRUint8 *aFontData,
PRUint32 aFontDataLength, FallibleTArray<PRUint8> *aNewFont)
{
NS_ASSERTION(aNewFont, "null font data array");
PRUint64 dataLength(aFontDataLength);
// new name table
static const PRUint32 neededNameIDs[] = {NAME_ID_FAMILY,
NAME_ID_STYLE,
NAME_ID_UNIQUE,
NAME_ID_FULL,
NAME_ID_POSTSCRIPT};
// calculate new name table size
PRUint16 nameCount = NS_ARRAY_LENGTH(neededNameIDs);
// leave room for null-terminator
PRUint16 nameStrLength = (aName.Length() + 1) * sizeof(PRUnichar);
// round name table size up to 4-byte multiple
PRUint32 nameTableSize = (sizeof(NameHeader) +
sizeof(NameRecord) * nameCount +
nameStrLength +
3) & ~3;
if (dataLength + nameTableSize > PR_UINT32_MAX)
return NS_ERROR_FAILURE;
// bug 505386 - need to handle unpadded font length
PRUint32 paddedFontDataSize = (aFontDataLength + 3) & ~3;
PRUint32 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
PRUint8 *newFontData = reinterpret_cast<PRUint8*>(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
PRUint32 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));
PRUint32 numTables = sfntHeader->numTables;
PRBool foundName = PR_FALSE;
for (i = 0; i < numTables; i++, dirEntry++) {
if (dirEntry->tag == TRUETYPE_TAG('n','a','m','e')) {
foundName = PR_TRUE;
break;
}
}
// function only called if font validates, so this should always be true
NS_ASSERTION(foundName, "attempt to rename font with no name table");
// note: dirEntry now points to name record
// recalculate name table checksum
PRUint32 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
PRUint32 checksum = 0;
// checksum for font = (checksum of header) + (checksum of tables)
PRUint32 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;
}
PRUint32 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;
}
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<PRUint8>& aNameTable, PRUint32 aNameID,
PRInt32 aPlatformID, nsTArray<nsString>& aNames)
{
return ReadNames(aNameTable, aNameID, LANG_ALL, aPlatformID, aNames);
}
nsresult
gfxFontUtils::ReadCanonicalName(FallibleTArray<PRUint8>& aNameTable, PRUint32 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, "x-mac-roman" },
{ 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, "x-mac-roman" },
{ 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 */ nsnull , /* 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 */ nsnull ,
/* [4] ENCODING_ID_MICROSOFT_BIG5 */ "Big5" ,
/* [5] ENCODING_ID_MICROSOFT_WANSUNG */ nsnull ,
/* [6] ENCODING_ID_MICROSOFT_JOHAB */ "x-johab" ,
/* [7] reserved */ nsnull ,
/* [8] reserved */ nsnull ,
/* [9] reserved */ nsnull ,
/*[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
// nsnull unknown charset, do not attempt conversion
const char*
gfxFontUtils::GetCharsetForFontName(PRUint16 aPlatform, PRUint16 aScript, PRUint16 aLanguage)
{
switch (aPlatform)
{
case PLATFORM_ID_UNICODE:
return "";
case PLATFORM_ID_MAC:
{
PRUint32 lo = 0, hi = ARRAY_SIZE(gMacFontNameCharsets);
MacFontNameCharsetMapping searchValue = { aScript, aLanguage, nsnull };
for (PRUint32 i = 0; i < 2; ++i) {
// binary search; if not found, set language to ANY and try again
while (lo < hi) {
PRUint32 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 nsnull;
}
// convert a raw name from the name table to an nsString, if possible;
// return value indicates whether conversion succeeded
PRBool
gfxFontUtils::DecodeFontName(const PRUint8 *aNameData, PRInt32 aByteLen,
PRUint32 aPlatformCode, PRUint32 aScriptCode,
PRUint32 aLangCode, nsAString& aName)
{
NS_ASSERTION(aByteLen > 0, "bad length for font name data");
const char *csName = GetCharsetForFontName(aPlatformCode, aScriptCode, aLangCode);
if (!csName) {
// nsnull -> 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 PR_FALSE;
}
if (csName[0] == 0) {
// empty charset name: data is utf16be, no need to instantiate a converter
PRUint32 strLen = aByteLen / 2;
#ifdef IS_LITTLE_ENDIAN
aName.SetLength(strLen);
CopySwapUTF16(reinterpret_cast<const PRUint16*>(aNameData),
reinterpret_cast<PRUint16*>(aName.BeginWriting()), strLen);
#else
aName.Assign(reinterpret_cast<const PRUnichar*>(aNameData), strLen);
#endif
return PR_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 PR_FALSE;
}
nsCOMPtr<nsIUnicodeDecoder> decoder;
rv = ccm->GetUnicodeDecoderRawInternal(csName, getter_AddRefs(decoder));
if (NS_FAILED(rv)) {
NS_WARNING("failed to get the decoder for a font name string");
return PR_FALSE;
}
PRInt32 destLength;
rv = decoder->GetMaxLength(reinterpret_cast<const char*>(aNameData), aByteLen, &destLength);
if (NS_FAILED(rv)) {
NS_WARNING("decoder->GetMaxLength failed, invalid font name?");
return PR_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 PR_FALSE;
}
aName.Truncate(destLength); // set the actual length
return PR_TRUE;
}
nsresult
gfxFontUtils::ReadNames(FallibleTArray<PRUint8>& aNameTable, PRUint32 aNameID,
PRInt32 aLangID, PRInt32 aPlatformID,
nsTArray<nsString>& aNames)
{
PRUint32 nameTableLen = aNameTable.Length();
NS_ASSERTION(nameTableLen != 0, "null name table");
if (nameTableLen == 0)
return NS_ERROR_FAILURE;
PRUint8 *nameTable = aNameTable.Elements();
// -- name table data
const NameHeader *nameHeader = reinterpret_cast<const NameHeader*>(nameTable);
PRUint32 nameCount = nameHeader->count;
// -- sanity check the number of name records
if (PRUint64(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));
PRUint64 nameStringsBase = PRUint64(nameHeader->stringOffset);
PRUint32 i;
for (i = 0; i < nameCount; i++, nameRecord++) {
PRUint32 platformID;
// skip over unwanted nameID's
if (PRUint32(nameRecord->nameID) != aNameID)
continue;
// skip over unwanted platform data
platformID = nameRecord->platformID;
if (aPlatformID != PLATFORM_ALL
&& PRUint32(nameRecord->platformID) != PLATFORM_ID)
continue;
// skip over unwanted languages
if (aLangID != LANG_ALL
&& PRUint32(nameRecord->languageID) != PRUint32(aLangID))
continue;
// add name to names array
// -- calculate string location
PRUint32 namelen = nameRecord->length;
PRUint32 nameoff = nameRecord->offset; // offset from base of string storage
if (nameStringsBase + PRUint64(nameoff) + PRUint64(namelen)
> nameTableLen) {
NS_WARNING("invalid font (name table strings)");
return NS_ERROR_FAILURE;
}
// -- decode if necessary and make nsString
nsAutoString name;
nsresult rv;
rv = DecodeFontName(nameTable + nameStringsBase + nameoff, namelen,
platformID, PRUint32(nameRecord->encodingID),
PRUint32(nameRecord->languageID), name);
if (NS_FAILED(rv))
continue;
PRUint32 k, numNames;
PRBool foundName = PR_FALSE;
numNames = aNames.Length();
for (k = 0; k < numNames; k++) {
if (name.Equals(aNames[k])) {
foundName = PR_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 {
PRUint32 eotSize; // Total structure length in PRUint8s (including string and font data)
PRUint32 fontDataSize; // Length of the OpenType font (FontData) in PRUint8s
PRUint32 version; // Version number of this format - 0x00010000
PRUint32 flags; // Processing Flags
PRUint8 panose[10]; // The PANOSE value for this font - See http://www.microsoft.com/typography/otspec/os2.htm#pan
PRUint8 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
PRUint8 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
PRUint32 weight; // The weight value for this font - See http://www.microsoft.com/typography/otspec/os2.htm#wtc
PRUint16 fsType; // Type flags that provide information about embedding permissions - See http://www.microsoft.com/typography/otspec/os2.htm#fst
PRUint16 magicNumber; // Magic number for EOT file - 0x504C. Used to check for data corruption.
PRUint32 unicodeRange1; // OS/2.UnicodeRange1 (bits 0-31) - See http://www.microsoft.com/typography/otspec/os2.htm#ur
PRUint32 unicodeRange2; // OS/2.UnicodeRange2 (bits 32-63) - See http://www.microsoft.com/typography/otspec/os2.htm#ur
PRUint32 unicodeRange3; // OS/2.UnicodeRange3 (bits 64-95) - See http://www.microsoft.com/typography/otspec/os2.htm#ur
PRUint32 unicodeRange4; // OS/2.UnicodeRange4 (bits 96-127) - See http://www.microsoft.com/typography/otspec/os2.htm#ur
PRUint32 codePageRange1; // CodePageRange1 (bits 0-31) - See http://www.microsoft.com/typography/otspec/os2.htm#cpr
PRUint32 codePageRange2; // CodePageRange2 (bits 32-63) - See http://www.microsoft.com/typography/otspec/os2.htm#cpr
PRUint32 checkSumAdjustment; // head.CheckSumAdjustment - See http://www.microsoft.com/typography/otspec/head.htm
PRUint32 reserved[4]; // Reserved - must be 0
PRUint16 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
// PRUint16 size;
// // array of UTF-16 chars, total length = <size> bytes
// // note: english version of name record string
// PRUint8 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(PRUint8 *aHeader, PRUint32 aHeaderLen)
{
PRUint32 offset = 0;
PRUint8 *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 PRUint8 *aFontData, PRUint32 aFontDataLength,
FallibleTArray<PRUint8> *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));
PRUint32 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
PRBool foundHead = PR_FALSE, foundOS2 = PR_FALSE, foundName = PR_FALSE, foundGlyphs = PR_FALSE;
PRUint32 headOffset, headLen, nameOffset, nameLen, os2Offset, os2Len;
PRUint32 i, numTables;
numTables = sfntHeader->numTables;
if (sizeof(SFNTHeader) + sizeof(TableDirEntry) * numTables > aFontDataLength)
return NS_ERROR_FAILURE;
PRUint64 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 (PRUint64(dirEntry->offset) + PRUint64(dirEntry->length) > dataLength)
return NS_ERROR_FAILURE;
switch (dirEntry->tag) {
case TRUETYPE_TAG('h','e','a','d'):
foundHead = PR_TRUE;
headOffset = dirEntry->offset;
headLen = dirEntry->length;
if (headLen < sizeof(HeadTable))
return NS_ERROR_FAILURE;
break;
case TRUETYPE_TAG('n','a','m','e'):
foundName = PR_TRUE;
nameOffset = dirEntry->offset;
nameLen = dirEntry->length;
break;
case TRUETYPE_TAG('O','S','/','2'):
foundOS2 = PR_TRUE;
os2Offset = dirEntry->offset;
os2Len = dirEntry->length;
break;
case TRUETYPE_TAG('g','l','y','f'): // TrueType-style quadratic glyph table
foundGlyphs = PR_TRUE;
break;
case TRUETYPE_TAG('C','F','F',' '): // PS-style cubic glyph table
foundGlyphs = PR_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);
PRUint32 nameStringsBase = PRUint32(nameHeader->stringOffset);
PRUint32 nameCount = nameHeader->count;
// -- sanity check the number of name records
if (PRUint64(nameCount) * sizeof(NameRecord) + PRUint64(nameOffset) > dataLength)
return NS_ERROR_FAILURE;
// -- 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));
PRUint32 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 (PRUint32(nameRecord->platformID) != PLATFORM_ID_MICROSOFT ||
PRUint32(nameRecord->encodingID) != ENCODING_ID_MICROSOFT_UNICODEBMP ||
PRUint32(nameRecord->languageID) != LANG_ID_MICROSOFT_EN_US)
continue;
switch ((PRUint32)nameRecord->nameID) {
case NAME_ID_FAMILY:
names[EOTFixedHeader::EOT_FAMILY_NAME_INDEX].offset = nameRecord->offset;
names[EOTFixedHeader::EOT_FAMILY_NAME_INDEX].length = nameRecord->length;
needNames &= ~(1 << EOTFixedHeader::EOT_FAMILY_NAME_INDEX);
break;
case NAME_ID_STYLE:
names[EOTFixedHeader::EOT_STYLE_NAME_INDEX].offset = nameRecord->offset;
names[EOTFixedHeader::EOT_STYLE_NAME_INDEX].length = nameRecord->length;
needNames &= ~(1 << EOTFixedHeader::EOT_STYLE_NAME_INDEX);
break;
case NAME_ID_FULL:
names[EOTFixedHeader::EOT_FULL_NAME_INDEX].offset = nameRecord->offset;
names[EOTFixedHeader::EOT_FULL_NAME_INDEX].length = nameRecord->length;
needNames &= ~(1 << EOTFixedHeader::EOT_FULL_NAME_INDEX);
break;
case NAME_ID_VERSION:
names[EOTFixedHeader::EOT_VERSION_NAME_INDEX].offset = nameRecord->offset;
names[EOTFixedHeader::EOT_VERSION_NAME_INDEX].length = nameRecord->length;
needNames &= ~(1 << EOTFixedHeader::EOT_VERSION_NAME_INDEX);
break;
default:
break;
}
if (needNames == 0)
break;
}
// the Version name is allowed to be null
if ((needNames & ~(1 << EOTFixedHeader::EOT_VERSION_NAME_INDEX)) != 0) {
return NS_ERROR_FAILURE;
}
// -- expand buffer if needed to include variable-length portion
PRUint32 eotVariableLength = 0;
eotVariableLength = (names[EOTFixedHeader::EOT_FAMILY_NAME_INDEX].length & (~1)) +
(names[EOTFixedHeader::EOT_STYLE_NAME_INDEX].length & (~1)) +
(names[EOTFixedHeader::EOT_FULL_NAME_INDEX].length & (~1)) +
(names[EOTFixedHeader::EOT_VERSION_NAME_INDEX].length & (~1)) +
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
PRUint8 *eotEnd = aHeader->Elements() + sizeof(EOTFixedHeader);
PRUint32 strOffset, strLen;
for (i = 0; i < EOTFixedHeader::EOT_NUM_NAMES; i++) {
PRUint32 namelen = names[i].length;
PRUint32 nameoff = names[i].offset; // offset from base of string storage
// sanity check the name string location
if (PRUint64(nameOffset) + PRUint64(nameStringsBase) +
PRUint64(nameoff) + PRUint64(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
*((PRUint16*) eotEnd) = PRUint16(strLen);
eotEnd += 2;
// length is number of UTF-16 chars, not bytes
CopySwapUTF16(reinterpret_cast<const PRUint16*>(aFontData + strOffset),
reinterpret_cast<PRUint16*>(eotEnd),
(strLen >> 1));
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
PRUint32 famOff = names[EOTFixedHeader::EOT_FAMILY_NAME_INDEX].offset;
PRUint32 famLen = names[EOTFixedHeader::EOT_FAMILY_NAME_INDEX].length;
PRUint32 fullOff = names[EOTFixedHeader::EOT_FULL_NAME_INDEX].offset;
PRUint32 fullLen = names[EOTFixedHeader::EOT_FULL_NAME_INDEX].length;
const PRUint8 *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 = (PRUint16) 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 */
PRBool
gfxFontUtils::IsCffFont(const PRUint8* aFontData)
{
// 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);
return (sfntHeader->sfntVersion == TRUETYPE_TAG('O','T','T','O'));
}
#endif
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