1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/harfbuzz/src/hb-open-file-private.hh Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,261 @@
1.4 +/*
1.5 + * Copyright © 2007,2008,2009 Red Hat, Inc.
1.6 + * Copyright © 2012 Google, Inc.
1.7 + *
1.8 + * This is part of HarfBuzz, a text shaping library.
1.9 + *
1.10 + * Permission is hereby granted, without written agreement and without
1.11 + * license or royalty fees, to use, copy, modify, and distribute this
1.12 + * software and its documentation for any purpose, provided that the
1.13 + * above copyright notice and the following two paragraphs appear in
1.14 + * all copies of this software.
1.15 + *
1.16 + * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
1.17 + * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
1.18 + * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
1.19 + * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
1.20 + * DAMAGE.
1.21 + *
1.22 + * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
1.23 + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
1.24 + * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
1.25 + * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
1.26 + * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
1.27 + *
1.28 + * Red Hat Author(s): Behdad Esfahbod
1.29 + * Google Author(s): Behdad Esfahbod
1.30 + */
1.31 +
1.32 +#ifndef HB_OPEN_FILE_PRIVATE_HH
1.33 +#define HB_OPEN_FILE_PRIVATE_HH
1.34 +
1.35 +#include "hb-open-type-private.hh"
1.36 +
1.37 +
1.38 +namespace OT {
1.39 +
1.40 +
1.41 +/*
1.42 + *
1.43 + * The OpenType Font File
1.44 + *
1.45 + */
1.46 +
1.47 +
1.48 +/*
1.49 + * Organization of an OpenType Font
1.50 + */
1.51 +
1.52 +struct OpenTypeFontFile;
1.53 +struct OffsetTable;
1.54 +struct TTCHeader;
1.55 +
1.56 +
1.57 +typedef struct TableRecord
1.58 +{
1.59 + inline bool sanitize (hb_sanitize_context_t *c) {
1.60 + TRACE_SANITIZE (this);
1.61 + return TRACE_RETURN (c->check_struct (this));
1.62 + }
1.63 +
1.64 + Tag tag; /* 4-byte identifier. */
1.65 + CheckSum checkSum; /* CheckSum for this table. */
1.66 + ULONG offset; /* Offset from beginning of TrueType font
1.67 + * file. */
1.68 + ULONG length; /* Length of this table. */
1.69 + public:
1.70 + DEFINE_SIZE_STATIC (16);
1.71 +} OpenTypeTable;
1.72 +
1.73 +typedef struct OffsetTable
1.74 +{
1.75 + friend struct OpenTypeFontFile;
1.76 +
1.77 + inline unsigned int get_table_count (void) const
1.78 + { return numTables; }
1.79 + inline const TableRecord& get_table (unsigned int i) const
1.80 + {
1.81 + if (unlikely (i >= numTables)) return Null(TableRecord);
1.82 + return tables[i];
1.83 + }
1.84 + inline bool find_table_index (hb_tag_t tag, unsigned int *table_index) const
1.85 + {
1.86 + Tag t;
1.87 + t.set (tag);
1.88 + unsigned int count = numTables;
1.89 + for (unsigned int i = 0; i < count; i++)
1.90 + {
1.91 + if (t == tables[i].tag)
1.92 + {
1.93 + if (table_index) *table_index = i;
1.94 + return true;
1.95 + }
1.96 + }
1.97 + if (table_index) *table_index = Index::NOT_FOUND_INDEX;
1.98 + return false;
1.99 + }
1.100 + inline const TableRecord& get_table_by_tag (hb_tag_t tag) const
1.101 + {
1.102 + unsigned int table_index;
1.103 + find_table_index (tag, &table_index);
1.104 + return get_table (table_index);
1.105 + }
1.106 +
1.107 + public:
1.108 + inline bool sanitize (hb_sanitize_context_t *c) {
1.109 + TRACE_SANITIZE (this);
1.110 + return TRACE_RETURN (c->check_struct (this) && c->check_array (tables, TableRecord::static_size, numTables));
1.111 + }
1.112 +
1.113 + protected:
1.114 + Tag sfnt_version; /* '\0\001\0\00' if TrueType / 'OTTO' if CFF */
1.115 + USHORT numTables; /* Number of tables. */
1.116 + USHORT searchRange; /* (Maximum power of 2 <= numTables) x 16 */
1.117 + USHORT entrySelector; /* Log2(maximum power of 2 <= numTables). */
1.118 + USHORT rangeShift; /* NumTables x 16-searchRange. */
1.119 + TableRecord tables[VAR]; /* TableRecord entries. numTables items */
1.120 + public:
1.121 + DEFINE_SIZE_ARRAY (12, tables);
1.122 +} OpenTypeFontFace;
1.123 +
1.124 +
1.125 +/*
1.126 + * TrueType Collections
1.127 + */
1.128 +
1.129 +struct TTCHeaderVersion1
1.130 +{
1.131 + friend struct TTCHeader;
1.132 +
1.133 + inline unsigned int get_face_count (void) const { return table.len; }
1.134 + inline const OpenTypeFontFace& get_face (unsigned int i) const { return this+table[i]; }
1.135 +
1.136 + inline bool sanitize (hb_sanitize_context_t *c) {
1.137 + TRACE_SANITIZE (this);
1.138 + return TRACE_RETURN (table.sanitize (c, this));
1.139 + }
1.140 +
1.141 + protected:
1.142 + Tag ttcTag; /* TrueType Collection ID string: 'ttcf' */
1.143 + FixedVersion version; /* Version of the TTC Header (1.0),
1.144 + * 0x00010000 */
1.145 + LongOffsetLongArrayOf<OffsetTable>
1.146 + table; /* Array of offsets to the OffsetTable for each font
1.147 + * from the beginning of the file */
1.148 + public:
1.149 + DEFINE_SIZE_ARRAY (12, table);
1.150 +};
1.151 +
1.152 +struct TTCHeader
1.153 +{
1.154 + friend struct OpenTypeFontFile;
1.155 +
1.156 + private:
1.157 +
1.158 + inline unsigned int get_face_count (void) const
1.159 + {
1.160 + switch (u.header.version.major) {
1.161 + case 2: /* version 2 is compatible with version 1 */
1.162 + case 1: return u.version1.get_face_count ();
1.163 + default:return 0;
1.164 + }
1.165 + }
1.166 + inline const OpenTypeFontFace& get_face (unsigned int i) const
1.167 + {
1.168 + switch (u.header.version.major) {
1.169 + case 2: /* version 2 is compatible with version 1 */
1.170 + case 1: return u.version1.get_face (i);
1.171 + default:return Null(OpenTypeFontFace);
1.172 + }
1.173 + }
1.174 +
1.175 + inline bool sanitize (hb_sanitize_context_t *c) {
1.176 + TRACE_SANITIZE (this);
1.177 + if (unlikely (!u.header.version.sanitize (c))) return TRACE_RETURN (false);
1.178 + switch (u.header.version.major) {
1.179 + case 2: /* version 2 is compatible with version 1 */
1.180 + case 1: return TRACE_RETURN (u.version1.sanitize (c));
1.181 + default:return TRACE_RETURN (true);
1.182 + }
1.183 + }
1.184 +
1.185 + protected:
1.186 + union {
1.187 + struct {
1.188 + Tag ttcTag; /* TrueType Collection ID string: 'ttcf' */
1.189 + FixedVersion version; /* Version of the TTC Header (1.0 or 2.0),
1.190 + * 0x00010000 or 0x00020000 */
1.191 + } header;
1.192 + TTCHeaderVersion1 version1;
1.193 + } u;
1.194 +};
1.195 +
1.196 +
1.197 +/*
1.198 + * OpenType Font File
1.199 + */
1.200 +
1.201 +struct OpenTypeFontFile
1.202 +{
1.203 + static const hb_tag_t CFFTag = HB_TAG ('O','T','T','O'); /* OpenType with Postscript outlines */
1.204 + static const hb_tag_t TrueTypeTag = HB_TAG ( 0 , 1 , 0 , 0 ); /* OpenType with TrueType outlines */
1.205 + static const hb_tag_t TTCTag = HB_TAG ('t','t','c','f'); /* TrueType Collection */
1.206 + static const hb_tag_t TrueTag = HB_TAG ('t','r','u','e'); /* Obsolete Apple TrueType */
1.207 + static const hb_tag_t Typ1Tag = HB_TAG ('t','y','p','1'); /* Obsolete Apple Type1 font in SFNT container */
1.208 +
1.209 + inline hb_tag_t get_tag (void) const { return u.tag; }
1.210 +
1.211 + inline unsigned int get_face_count (void) const
1.212 + {
1.213 + switch (u.tag) {
1.214 + case CFFTag: /* All the non-collection tags */
1.215 + case TrueTag:
1.216 + case Typ1Tag:
1.217 + case TrueTypeTag: return 1;
1.218 + case TTCTag: return u.ttcHeader.get_face_count ();
1.219 + default: return 0;
1.220 + }
1.221 + }
1.222 + inline const OpenTypeFontFace& get_face (unsigned int i) const
1.223 + {
1.224 + switch (u.tag) {
1.225 + /* Note: for non-collection SFNT data we ignore index. This is because
1.226 + * Apple dfont container is a container of SFNT's. So each SFNT is a
1.227 + * non-TTC, but the index is more than zero. */
1.228 + case CFFTag: /* All the non-collection tags */
1.229 + case TrueTag:
1.230 + case Typ1Tag:
1.231 + case TrueTypeTag: return u.fontFace;
1.232 + case TTCTag: return u.ttcHeader.get_face (i);
1.233 + default: return Null(OpenTypeFontFace);
1.234 + }
1.235 + }
1.236 +
1.237 + inline bool sanitize (hb_sanitize_context_t *c) {
1.238 + TRACE_SANITIZE (this);
1.239 + if (unlikely (!u.tag.sanitize (c))) return TRACE_RETURN (false);
1.240 + switch (u.tag) {
1.241 + case CFFTag: /* All the non-collection tags */
1.242 + case TrueTag:
1.243 + case Typ1Tag:
1.244 + case TrueTypeTag: return TRACE_RETURN (u.fontFace.sanitize (c));
1.245 + case TTCTag: return TRACE_RETURN (u.ttcHeader.sanitize (c));
1.246 + default: return TRACE_RETURN (true);
1.247 + }
1.248 + }
1.249 +
1.250 + protected:
1.251 + union {
1.252 + Tag tag; /* 4-byte identifier. */
1.253 + OpenTypeFontFace fontFace;
1.254 + TTCHeader ttcHeader;
1.255 + } u;
1.256 + public:
1.257 + DEFINE_SIZE_UNION (4, tag);
1.258 +};
1.259 +
1.260 +
1.261 +} /* namespace OT */
1.262 +
1.263 +
1.264 +#endif /* HB_OPEN_FILE_PRIVATE_HH */
