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1 /* | |
2 * Copyright (C) 2008, 2009 Apple Inc. All rights reserved. | |
3 * Copyright (C) 2009 Torch Mobile, Inc. | |
4 * | |
5 * Redistribution and use in source and binary forms, with or without | |
6 * modification, are permitted provided that the following conditions | |
7 * are met: | |
8 * 1. Redistributions of source code must retain the above copyright | |
9 * notice, this list of conditions and the following disclaimer. | |
10 * 2. Redistributions in binary form must reproduce the above copyright | |
11 * notice, this list of conditions and the following disclaimer in the | |
12 * documentation and/or other materials provided with the distribution. | |
13 * | |
14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY | |
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR | |
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
25 */ | |
26 | |
27 #include "config.h" | |
28 #include "core/platform/graphics/opentype/OpenTypeUtilities.h" | |
29 | |
30 #include "platform/SharedBuffer.h" | |
31 | |
32 namespace WebCore { | |
33 | |
34 struct BigEndianUShort { | |
35 operator unsigned short() const { return (v & 0x00ff) << 8 | v >> 8; } | |
36 BigEndianUShort(unsigned short u) : v((u & 0x00ff) << 8 | u >> 8) { } | |
37 unsigned short v; | |
38 }; | |
39 | |
40 struct BigEndianULong { | |
41 operator unsigned() const { return (v & 0xff) << 24 | (v & 0xff00) << 8 | (v
& 0xff0000) >> 8 | v >> 24; } | |
42 BigEndianULong(unsigned u) : v((u & 0xff) << 24 | (u & 0xff00) << 8 | (u & 0
xff0000) >> 8 | u >> 24) { } | |
43 unsigned v; | |
44 }; | |
45 | |
46 #pragma pack(1) | |
47 | |
48 struct TableDirectoryEntry { | |
49 BigEndianULong tag; | |
50 BigEndianULong checkSum; | |
51 BigEndianULong offset; | |
52 BigEndianULong length; | |
53 }; | |
54 | |
55 // Fixed type is not defined on non-CG and Windows platforms. |version| in sfntH
eader | |
56 // and headTable and |fontRevision| in headTable are of Fixed, but they're | |
57 // not actually refered to anywhere. Therefore, we just have to match | |
58 // the size (4 bytes). For the definition of Fixed type, see | |
59 // http://developer.apple.com/documentation/mac/Legacy/GXEnvironment/GXEnvironme
nt-356.html#HEADING356-6. | |
60 typedef int32_t Fixed; | |
61 | |
62 struct sfntHeader { | |
63 Fixed version; | |
64 BigEndianUShort numTables; | |
65 BigEndianUShort searchRange; | |
66 BigEndianUShort entrySelector; | |
67 BigEndianUShort rangeShift; | |
68 TableDirectoryEntry tables[1]; | |
69 }; | |
70 | |
71 struct OS2Table { | |
72 BigEndianUShort version; | |
73 BigEndianUShort avgCharWidth; | |
74 BigEndianUShort weightClass; | |
75 BigEndianUShort widthClass; | |
76 BigEndianUShort fsType; | |
77 BigEndianUShort subscriptXSize; | |
78 BigEndianUShort subscriptYSize; | |
79 BigEndianUShort subscriptXOffset; | |
80 BigEndianUShort subscriptYOffset; | |
81 BigEndianUShort superscriptXSize; | |
82 BigEndianUShort superscriptYSize; | |
83 BigEndianUShort superscriptXOffset; | |
84 BigEndianUShort superscriptYOffset; | |
85 BigEndianUShort strikeoutSize; | |
86 BigEndianUShort strikeoutPosition; | |
87 BigEndianUShort familyClass; | |
88 uint8_t panose[10]; | |
89 BigEndianULong unicodeRange[4]; | |
90 uint8_t vendID[4]; | |
91 BigEndianUShort fsSelection; | |
92 BigEndianUShort firstCharIndex; | |
93 BigEndianUShort lastCharIndex; | |
94 BigEndianUShort typoAscender; | |
95 BigEndianUShort typoDescender; | |
96 BigEndianUShort typoLineGap; | |
97 BigEndianUShort winAscent; | |
98 BigEndianUShort winDescent; | |
99 BigEndianULong codePageRange[2]; | |
100 BigEndianUShort xHeight; | |
101 BigEndianUShort capHeight; | |
102 BigEndianUShort defaultChar; | |
103 BigEndianUShort breakChar; | |
104 BigEndianUShort maxContext; | |
105 }; | |
106 | |
107 struct headTable { | |
108 Fixed version; | |
109 Fixed fontRevision; | |
110 BigEndianULong checkSumAdjustment; | |
111 BigEndianULong magicNumber; | |
112 BigEndianUShort flags; | |
113 BigEndianUShort unitsPerEm; | |
114 long long created; | |
115 long long modified; | |
116 BigEndianUShort xMin; | |
117 BigEndianUShort xMax; | |
118 BigEndianUShort yMin; | |
119 BigEndianUShort yMax; | |
120 BigEndianUShort macStyle; | |
121 BigEndianUShort lowestRectPPEM; | |
122 BigEndianUShort fontDirectionHint; | |
123 BigEndianUShort indexToLocFormat; | |
124 BigEndianUShort glyphDataFormat; | |
125 }; | |
126 | |
127 struct nameRecord { | |
128 BigEndianUShort platformID; | |
129 BigEndianUShort encodingID; | |
130 BigEndianUShort languageID; | |
131 BigEndianUShort nameID; | |
132 BigEndianUShort length; | |
133 BigEndianUShort offset; | |
134 }; | |
135 | |
136 struct nameTable { | |
137 BigEndianUShort format; | |
138 BigEndianUShort count; | |
139 BigEndianUShort stringOffset; | |
140 nameRecord nameRecords[1]; | |
141 }; | |
142 | |
143 #pragma pack() | |
144 | |
145 // adds fontName to the font table in fontData, and writes the new font table to
rewrittenFontTable | |
146 // returns the size of the name table (which is used by renameAndActivateFont),
or 0 on early abort | |
147 static size_t renameFont(SharedBuffer* fontData, const String& fontName, Vector<
char> &rewrittenFontData) | |
148 { | |
149 size_t originalDataSize = fontData->size(); | |
150 const sfntHeader* sfnt = reinterpret_cast<const sfntHeader*>(fontData->data(
)); | |
151 | |
152 unsigned t; | |
153 for (t = 0; t < sfnt->numTables; ++t) { | |
154 if (sfnt->tables[t].tag == 'name') | |
155 break; | |
156 } | |
157 if (t == sfnt->numTables) | |
158 return 0; | |
159 | |
160 const int nameRecordCount = 5; | |
161 | |
162 // Rounded up to a multiple of 4 to simplify the checksum calculation. | |
163 size_t nameTableSize = ((offsetof(nameTable, nameRecords) + nameRecordCount
* sizeof(nameRecord) + fontName.length() * sizeof(UChar)) & ~3) + 4; | |
164 | |
165 rewrittenFontData.resize(fontData->size() + nameTableSize); | |
166 char* data = rewrittenFontData.data(); | |
167 memcpy(data, fontData->data(), originalDataSize); | |
168 | |
169 // Make the table directory entry point to the new 'name' table. | |
170 sfntHeader* rewrittenSfnt = reinterpret_cast<sfntHeader*>(data); | |
171 rewrittenSfnt->tables[t].length = nameTableSize; | |
172 rewrittenSfnt->tables[t].offset = originalDataSize; | |
173 | |
174 // Write the new 'name' table after the original font data. | |
175 nameTable* name = reinterpret_cast<nameTable*>(data + originalDataSize); | |
176 name->format = 0; | |
177 name->count = nameRecordCount; | |
178 name->stringOffset = offsetof(nameTable, nameRecords) + nameRecordCount * si
zeof(nameRecord); | |
179 for (unsigned i = 0; i < nameRecordCount; ++i) { | |
180 name->nameRecords[i].platformID = 3; | |
181 name->nameRecords[i].encodingID = 1; | |
182 name->nameRecords[i].languageID = 0x0409; | |
183 name->nameRecords[i].offset = 0; | |
184 name->nameRecords[i].length = fontName.length() * sizeof(UChar); | |
185 } | |
186 | |
187 // The required 'name' record types: Family, Style, Unique, Full and PostScr
ipt. | |
188 name->nameRecords[0].nameID = 1; | |
189 name->nameRecords[1].nameID = 2; | |
190 name->nameRecords[2].nameID = 3; | |
191 name->nameRecords[3].nameID = 4; | |
192 name->nameRecords[4].nameID = 6; | |
193 | |
194 for (unsigned i = 0; i < fontName.length(); ++i) | |
195 reinterpret_cast<BigEndianUShort*>(data + originalDataSize + name->strin
gOffset)[i] = fontName[i]; | |
196 | |
197 // Update the table checksum in the directory entry. | |
198 rewrittenSfnt->tables[t].checkSum = 0; | |
199 for (unsigned i = 0; i * sizeof(BigEndianULong) < nameTableSize; ++i) | |
200 rewrittenSfnt->tables[t].checkSum = rewrittenSfnt->tables[t].checkSum +
reinterpret_cast<BigEndianULong*>(name)[i]; | |
201 | |
202 return nameTableSize; | |
203 } | |
204 | |
205 // Rename the font and install the new font data into the system | |
206 HANDLE renameAndActivateFont(SharedBuffer* fontData, const String& fontName) | |
207 { | |
208 Vector<char> rewrittenFontData; | |
209 size_t nameTableSize = renameFont(fontData, fontName, rewrittenFontData); | |
210 if (!nameTableSize) | |
211 return 0; | |
212 | |
213 DWORD numFonts = 0; | |
214 HANDLE fontHandle = AddFontMemResourceEx(rewrittenFontData.data(), fontData-
>size() + nameTableSize, 0, &numFonts); | |
215 | |
216 if (fontHandle && numFonts < 1) { | |
217 RemoveFontMemResourceEx(fontHandle); | |
218 return 0; | |
219 } | |
220 | |
221 return fontHandle; | |
222 } | |
223 | |
224 } | |
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