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comparison: gfx/harfbuzz/src/hb-open-file-private.hh
gfx/harfbuzz/src/hb-open-file-private.hh
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- TOR_BUG_9701
- changeset 14
- 925c144e1f1f
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| -1:000000000000 | 0:9fa80f38cd7e |
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| 1 /* | |
| 2 * Copyright © 2007,2008,2009 Red Hat, Inc. | |
| 3 * Copyright © 2012 Google, Inc. | |
| 4 * | |
| 5 * This is part of HarfBuzz, a text shaping library. | |
| 6 * | |
| 7 * Permission is hereby granted, without written agreement and without | |
| 8 * license or royalty fees, to use, copy, modify, and distribute this | |
| 9 * software and its documentation for any purpose, provided that the | |
| 10 * above copyright notice and the following two paragraphs appear in | |
| 11 * all copies of this software. | |
| 12 * | |
| 13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR | |
| 14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES | |
| 15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN | |
| 16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH | |
| 17 * DAMAGE. | |
| 18 * | |
| 19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, | |
| 20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
| 21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS | |
| 22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO | |
| 23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. | |
| 24 * | |
| 25 * Red Hat Author(s): Behdad Esfahbod | |
| 26 * Google Author(s): Behdad Esfahbod | |
| 27 */ | |
| 28 | |
| 29 #ifndef HB_OPEN_FILE_PRIVATE_HH | |
| 30 #define HB_OPEN_FILE_PRIVATE_HH | |
| 31 | |
| 32 #include "hb-open-type-private.hh" | |
| 33 | |
| 34 | |
| 35 namespace OT { | |
| 36 | |
| 37 | |
| 38 /* | |
| 39 * | |
| 40 * The OpenType Font File | |
| 41 * | |
| 42 */ | |
| 43 | |
| 44 | |
| 45 /* | |
| 46 * Organization of an OpenType Font | |
| 47 */ | |
| 48 | |
| 49 struct OpenTypeFontFile; | |
| 50 struct OffsetTable; | |
| 51 struct TTCHeader; | |
| 52 | |
| 53 | |
| 54 typedef struct TableRecord | |
| 55 { | |
| 56 inline bool sanitize (hb_sanitize_context_t *c) { | |
| 57 TRACE_SANITIZE (this); | |
| 58 return TRACE_RETURN (c->check_struct (this)); | |
| 59 } | |
| 60 | |
| 61 Tag tag; /* 4-byte identifier. */ | |
| 62 CheckSum checkSum; /* CheckSum for this table. */ | |
| 63 ULONG offset; /* Offset from beginning of TrueType font | |
| 64 * file. */ | |
| 65 ULONG length; /* Length of this table. */ | |
| 66 public: | |
| 67 DEFINE_SIZE_STATIC (16); | |
| 68 } OpenTypeTable; | |
| 69 | |
| 70 typedef struct OffsetTable | |
| 71 { | |
| 72 friend struct OpenTypeFontFile; | |
| 73 | |
| 74 inline unsigned int get_table_count (void) const | |
| 75 { return numTables; } | |
| 76 inline const TableRecord& get_table (unsigned int i) const | |
| 77 { | |
| 78 if (unlikely (i >= numTables)) return Null(TableRecord); | |
| 79 return tables[i]; | |
| 80 } | |
| 81 inline bool find_table_index (hb_tag_t tag, unsigned int *table_index) const | |
| 82 { | |
| 83 Tag t; | |
| 84 t.set (tag); | |
| 85 unsigned int count = numTables; | |
| 86 for (unsigned int i = 0; i < count; i++) | |
| 87 { | |
| 88 if (t == tables[i].tag) | |
| 89 { | |
| 90 if (table_index) *table_index = i; | |
| 91 return true; | |
| 92 } | |
| 93 } | |
| 94 if (table_index) *table_index = Index::NOT_FOUND_INDEX; | |
| 95 return false; | |
| 96 } | |
| 97 inline const TableRecord& get_table_by_tag (hb_tag_t tag) const | |
| 98 { | |
| 99 unsigned int table_index; | |
| 100 find_table_index (tag, &table_index); | |
| 101 return get_table (table_index); | |
| 102 } | |
| 103 | |
| 104 public: | |
| 105 inline bool sanitize (hb_sanitize_context_t *c) { | |
| 106 TRACE_SANITIZE (this); | |
| 107 return TRACE_RETURN (c->check_struct (this) && c->check_array (tables, TableRecord::static_size, numTables)); | |
| 108 } | |
| 109 | |
| 110 protected: | |
| 111 Tag sfnt_version; /* '\0\001\0\00' if TrueType / 'OTTO' if CFF */ | |
| 112 USHORT numTables; /* Number of tables. */ | |
| 113 USHORT searchRange; /* (Maximum power of 2 <= numTables) x 16 */ | |
| 114 USHORT entrySelector; /* Log2(maximum power of 2 <= numTables). */ | |
| 115 USHORT rangeShift; /* NumTables x 16-searchRange. */ | |
| 116 TableRecord tables[VAR]; /* TableRecord entries. numTables items */ | |
| 117 public: | |
| 118 DEFINE_SIZE_ARRAY (12, tables); | |
| 119 } OpenTypeFontFace; | |
| 120 | |
| 121 | |
| 122 /* | |
| 123 * TrueType Collections | |
| 124 */ | |
| 125 | |
| 126 struct TTCHeaderVersion1 | |
| 127 { | |
| 128 friend struct TTCHeader; | |
| 129 | |
| 130 inline unsigned int get_face_count (void) const { return table.len; } | |
| 131 inline const OpenTypeFontFace& get_face (unsigned int i) const { return this+table[i]; } | |
| 132 | |
| 133 inline bool sanitize (hb_sanitize_context_t *c) { | |
| 134 TRACE_SANITIZE (this); | |
| 135 return TRACE_RETURN (table.sanitize (c, this)); | |
| 136 } | |
| 137 | |
| 138 protected: | |
| 139 Tag ttcTag; /* TrueType Collection ID string: 'ttcf' */ | |
| 140 FixedVersion version; /* Version of the TTC Header (1.0), | |
| 141 * 0x00010000 */ | |
| 142 LongOffsetLongArrayOf<OffsetTable> | |
| 143 table; /* Array of offsets to the OffsetTable for each font | |
| 144 * from the beginning of the file */ | |
| 145 public: | |
| 146 DEFINE_SIZE_ARRAY (12, table); | |
| 147 }; | |
| 148 | |
| 149 struct TTCHeader | |
| 150 { | |
| 151 friend struct OpenTypeFontFile; | |
| 152 | |
| 153 private: | |
| 154 | |
| 155 inline unsigned int get_face_count (void) const | |
| 156 { | |
| 157 switch (u.header.version.major) { | |
| 158 case 2: /* version 2 is compatible with version 1 */ | |
| 159 case 1: return u.version1.get_face_count (); | |
| 160 default:return 0; | |
| 161 } | |
| 162 } | |
| 163 inline const OpenTypeFontFace& get_face (unsigned int i) const | |
| 164 { | |
| 165 switch (u.header.version.major) { | |
| 166 case 2: /* version 2 is compatible with version 1 */ | |
| 167 case 1: return u.version1.get_face (i); | |
| 168 default:return Null(OpenTypeFontFace); | |
| 169 } | |
| 170 } | |
| 171 | |
| 172 inline bool sanitize (hb_sanitize_context_t *c) { | |
| 173 TRACE_SANITIZE (this); | |
| 174 if (unlikely (!u.header.version.sanitize (c))) return TRACE_RETURN (false); | |
| 175 switch (u.header.version.major) { | |
| 176 case 2: /* version 2 is compatible with version 1 */ | |
| 177 case 1: return TRACE_RETURN (u.version1.sanitize (c)); | |
| 178 default:return TRACE_RETURN (true); | |
| 179 } | |
| 180 } | |
| 181 | |
| 182 protected: | |
| 183 union { | |
| 184 struct { | |
| 185 Tag ttcTag; /* TrueType Collection ID string: 'ttcf' */ | |
| 186 FixedVersion version; /* Version of the TTC Header (1.0 or 2.0), | |
| 187 * 0x00010000 or 0x00020000 */ | |
| 188 } header; | |
| 189 TTCHeaderVersion1 version1; | |
| 190 } u; | |
| 191 }; | |
| 192 | |
| 193 | |
| 194 /* | |
| 195 * OpenType Font File | |
| 196 */ | |
| 197 | |
| 198 struct OpenTypeFontFile | |
| 199 { | |
| 200 static const hb_tag_t CFFTag = HB_TAG ('O','T','T','O'); /* OpenType with Postscript outlines */ | |
| 201 static const hb_tag_t TrueTypeTag = HB_TAG ( 0 , 1 , 0 , 0 ); /* OpenType with TrueType outlines */ | |
| 202 static const hb_tag_t TTCTag = HB_TAG ('t','t','c','f'); /* TrueType Collection */ | |
| 203 static const hb_tag_t TrueTag = HB_TAG ('t','r','u','e'); /* Obsolete Apple TrueType */ | |
| 204 static const hb_tag_t Typ1Tag = HB_TAG ('t','y','p','1'); /* Obsolete Apple Type1 font in SFNT container */ | |
| 205 | |
| 206 inline hb_tag_t get_tag (void) const { return u.tag; } | |
| 207 | |
| 208 inline unsigned int get_face_count (void) const | |
| 209 { | |
| 210 switch (u.tag) { | |
| 211 case CFFTag: /* All the non-collection tags */ | |
| 212 case TrueTag: | |
| 213 case Typ1Tag: | |
| 214 case TrueTypeTag: return 1; | |
| 215 case TTCTag: return u.ttcHeader.get_face_count (); | |
| 216 default: return 0; | |
| 217 } | |
| 218 } | |
| 219 inline const OpenTypeFontFace& get_face (unsigned int i) const | |
| 220 { | |
| 221 switch (u.tag) { | |
| 222 /* Note: for non-collection SFNT data we ignore index. This is because | |
| 223 * Apple dfont container is a container of SFNT's. So each SFNT is a | |
| 224 * non-TTC, but the index is more than zero. */ | |
| 225 case CFFTag: /* All the non-collection tags */ | |
| 226 case TrueTag: | |
| 227 case Typ1Tag: | |
| 228 case TrueTypeTag: return u.fontFace; | |
| 229 case TTCTag: return u.ttcHeader.get_face (i); | |
| 230 default: return Null(OpenTypeFontFace); | |
| 231 } | |
| 232 } | |
| 233 | |
| 234 inline bool sanitize (hb_sanitize_context_t *c) { | |
| 235 TRACE_SANITIZE (this); | |
| 236 if (unlikely (!u.tag.sanitize (c))) return TRACE_RETURN (false); | |
| 237 switch (u.tag) { | |
| 238 case CFFTag: /* All the non-collection tags */ | |
| 239 case TrueTag: | |
| 240 case Typ1Tag: | |
| 241 case TrueTypeTag: return TRACE_RETURN (u.fontFace.sanitize (c)); | |
| 242 case TTCTag: return TRACE_RETURN (u.ttcHeader.sanitize (c)); | |
| 243 default: return TRACE_RETURN (true); | |
| 244 } | |
| 245 } | |
| 246 | |
| 247 protected: | |
| 248 union { | |
| 249 Tag tag; /* 4-byte identifier. */ | |
| 250 OpenTypeFontFace fontFace; | |
| 251 TTCHeader ttcHeader; | |
| 252 } u; | |
| 253 public: | |
| 254 DEFINE_SIZE_UNION (4, tag); | |
| 255 }; | |
| 256 | |
| 257 | |
| 258 } /* namespace OT */ | |
| 259 | |
| 260 | |
| 261 #endif /* HB_OPEN_FILE_PRIVATE_HH */ |
