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| 1 #include "SkEndian.h" | |
| 2 #include "SkFontHost.h" | |
| 3 #include "SkStream.h" | |
| 4 | |
| 5 struct SkSFNTHeader { | |
| 6 uint32_t fVersion; | |
| 7 uint16_t fNumTables; | |
| 8 uint16_t fSearchRange; | |
| 9 uint16_t fEntrySelector; | |
| 10 uint16_t fRangeShift; | |
| 11 }; | |
| 12 | |
| 13 struct SkTTCFHeader { | |
| 14 uint32_t fTag; | |
| 15 uint32_t fVersion; | |
| 16 uint32_t fNumOffsets; | |
| 17 uint32_t fOffset0; // the first of N (fNumOffsets) | |
| 18 }; | |
| 19 | |
| 20 union SkSharedTTHeader { | |
| 21 SkSFNTHeader fSingle; | |
| 22 SkTTCFHeader fCollection; | |
| 23 }; | |
| 24 | |
| 25 struct SkSFNTDirEntry { | |
| 26 uint32_t fTag; | |
| 27 uint32_t fChecksum; | |
| 28 uint32_t fOffset; | |
| 29 uint32_t fLength; | |
| 30 }; | |
| 31 | |
| 32 static int count_tables(SkStream* stream, size_t* offsetToDir = NULL) { | |
| 33 SkSharedTTHeader shared; | |
| 34 if (stream->read(&shared, sizeof(shared)) != sizeof(shared)) { | |
| 35 return 0; | |
| 36 } | |
| 37 | |
| 38 uint32_t tag = SkEndian_SwapBE32(shared.fCollection.fTag); | |
| 39 if (SkSetFourByteTag('t', 't', 'c', 'f') == tag) { | |
| 40 if (shared.fCollection.fNumOffsets == 0) { | |
| 41 return 0; | |
| 42 } | |
| 43 size_t offset = SkEndian_SwapBE32(shared.fCollection.fOffset0); | |
| 44 stream->rewind(); | |
| 45 if (stream->skip(offset) != offset) { | |
| 46 return 0; | |
| 47 } | |
| 48 if (stream->read(&shared, sizeof(shared)) != sizeof(shared)) { | |
| 49 return 0; | |
| 50 } | |
| 51 if (offsetToDir) { | |
| 52 *offsetToDir = offset; | |
| 53 } | |
| 54 } else { | |
| 55 *offsetToDir = 0; | |
| 56 } | |
| 57 | |
| 58 return SkEndian_SwapBE16(shared.fSingle.fNumTables); | |
| 59 } | |
| 60 | |
| 61 /////////////////////////////////////////////////////////////////////////////// | |
| 62 | |
| 63 struct SfntHeader { | |
| 64 SfntHeader() : fCount(0), fDir(NULL) {} | |
| 65 ~SfntHeader() { sk_free(fDir); } | |
| 66 | |
| 67 bool init(SkStream* stream) { | |
| 68 size_t offsetToDir; | |
| 69 fCount = count_tables(stream, &offsetToDir); | |
| 70 if (0 == fCount) { | |
| 71 return false; | |
| 72 } | |
| 73 | |
| 74 stream->rewind(); | |
| 75 const size_t tableRecordOffset = offsetToDir + sizeof(SkSFNTHeader); | |
| 76 if (stream->skip(tableRecordOffset) != tableRecordOffset) { | |
| 77 return false; | |
| 78 } | |
| 79 | |
| 80 size_t size = fCount * sizeof(SkSFNTDirEntry); | |
| 81 fDir = reinterpret_cast<SkSFNTDirEntry*>(sk_malloc_throw(size)); | |
| 82 return stream->read(fDir, size) == size; | |
| 83 } | |
| 84 | |
| 85 int fCount; | |
| 86 SkSFNTDirEntry* fDir; | |
| 87 }; | |
| 88 | |
| 89 /////////////////////////////////////////////////////////////////////////////// | |
| 90 | |
| 91 int SkFontHost::CountTables(SkFontID fontID) { | |
| 92 SkStream* stream = SkFontHost::OpenStream(fontID); | |
| 93 if (NULL == stream) { | |
| 94 return 0; | |
| 95 } | |
| 96 | |
| 97 SkAutoUnref au(stream); | |
| 98 return count_tables(stream); | |
| 99 } | |
| 100 | |
| 101 int SkFontHost::GetTableTags(SkFontID fontID, SkFontTableTag tags[]) { | |
| 102 SkStream* stream = SkFontHost::OpenStream(fontID); | |
| 103 if (NULL == stream) { | |
| 104 return 0; | |
| 105 } | |
| 106 | |
| 107 SkAutoUnref au(stream); | |
| 108 SfntHeader header; | |
| 109 if (!header.init(stream)) { | |
| 110 return 0; | |
| 111 } | |
| 112 | |
| 113 for (int i = 0; i < header.fCount; i++) { | |
| 114 tags[i] = SkEndian_SwapBE32(header.fDir[i].fTag); | |
| 115 } | |
| 116 return header.fCount; | |
| 117 } | |
| 118 | |
| 119 size_t SkFontHost::GetTableSize(SkFontID fontID, SkFontTableTag tag) { | |
| 120 SkStream* stream = SkFontHost::OpenStream(fontID); | |
| 121 if (NULL == stream) { | |
| 122 return 0; | |
| 123 } | |
| 124 | |
| 125 SkAutoUnref au(stream); | |
| 126 SfntHeader header; | |
| 127 if (!header.init(stream)) { | |
| 128 return 0; | |
| 129 } | |
| 130 | |
| 131 for (int i = 0; i < header.fCount; i++) { | |
| 132 if (SkEndian_SwapBE32(header.fDir[i].fTag) == tag) { | |
| 133 return SkEndian_SwapBE32(header.fDir[i].fLength); | |
| 134 } | |
| 135 } | |
| 136 return 0; | |
| 137 } | |
| 138 | |
| 139 size_t SkFontHost::GetTableData(SkFontID fontID, SkFontTableTag tag, | |
| 140 size_t offset, size_t length, void* data) { | |
| 141 SkStream* stream = SkFontHost::OpenStream(fontID); | |
| 142 if (NULL == stream) { | |
| 143 return 0; | |
| 144 } | |
| 145 | |
| 146 SkAutoUnref au(stream); | |
| 147 SfntHeader header; | |
| 148 if (!header.init(stream)) { | |
| 149 return 0; | |
| 150 } | |
| 151 | |
| 152 for (int i = 0; i < header.fCount; i++) { | |
| 153 if (SkEndian_SwapBE32(header.fDir[i].fTag) == tag) { | |
| 154 size_t realOffset = SkEndian_SwapBE32(header.fDir[i].fOffset); | |
| 155 size_t realLength = SkEndian_SwapBE32(header.fDir[i].fLength); | |
| 156 // now sanity check the caller's offset/length | |
| 157 if (offset >= realLength) { | |
| 158 return 0; | |
| 159 } | |
| 160 // if the caller is trusting the length from the file, then a | |
| 161 // hostile file might choose a value which would overflow offset + | |
| 162 // length. | |
| 163 if (offset + length < offset) { | |
| 164 return 0; | |
| 165 } | |
| 166 if (offset + length > realLength) { | |
| 167 length = realLength - offset; | |
| 168 } | |
| 169 // skip the stream to the part of the table we want to copy from | |
| 170 stream->rewind(); | |
| 171 size_t bytesToSkip = realOffset + offset; | |
| 172 if (stream->skip(bytesToSkip) != bytesToSkip) { | |
| 173 return 0; | |
| 174 } | |
| 175 if (stream->read(data, length) != length) { | |
| 176 return 0; | |
| 177 } | |
| 178 return length; | |
| 179 } | |
| 180 } | |
| 181 return 0; | |
| 182 } | |
| 183 | |
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Chromium Code Reviews
Issue 113827:
Remove the remainder of the skia source code from the Chromium repo.... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/