#include #include #include /* Public header */ typedef uint32_t hb_tag_t; #define HB_TAG(a,b,c,d) ((hb_tag_t)(((uint8_t)a<<24)|((uint8_t)b<<16)|((uint8_t)c<<8)|(uint8_t)d)) /* Implementation */ /* Macros to convert to/from BigEndian */ #define hb_be_uint8_t #define hb_be_int8_t #define hb_be_uint16_t GUINT16_TO_BE #define hb_be_int16_t GINT16_TO_BE #define hb_be_uint32_t GUINT32_TO_BE #define hb_be_int32_t GINT32_TO_BE #define hb_be_uint64_t GUINT64_TO_BE #define hb_be_int64_t GINT64_TO_BE /* * Int types */ #define DEFINE_INT_TYPE1(NAME, TYPE, BIG_ENDIAN) \ struct NAME { \ inline NAME (void) { v = 0; } \ explicit inline NAME (TYPE i) { v = BIG_ENDIAN(i); } \ inline NAME& operator = (TYPE i) { v = BIG_ENDIAN(i); return *this; } \ inline operator TYPE(void) const { return BIG_ENDIAN(v); } \ inline bool operator== (NAME o) const { return v == o.v; } \ private: TYPE v; \ } #define DEFINE_INT_TYPE0(NAME, type) DEFINE_INT_TYPE1 (NAME, type, hb_be_##type) #define DEFINE_INT_TYPE(NAME, u, w) DEFINE_INT_TYPE0 (NAME, u##int##w##_t) /* * Array types */ /* get_len() is a method returning the number of items in an array-like object */ #define DEFINE_LEN(Type, array, num) \ inline unsigned int get_len(void) const { return num; } \ /* get_size() is a method returning the size in bytes of an array-like object */ #define DEFINE_SIZE(Type, array, num) \ inline unsigned int get_size(void) const { return sizeof (*this) + sizeof (Type) * num; } #define DEFINE_LEN_AND_SIZE(Type, array, num) \ DEFINE_LEN(Type, array, num) \ DEFINE_SIZE(Type, array, num) #define DEFINE_NOT_INSTANTIABLE(Type) \ private: inline Type() {} /* cannot be instantiated */ \ public: /* An array type is one that contains a variable number of objects * as its last item. An array object is extended with len() and size() * methods, as well as overloaded [] operator. */ #define DEFINE_ARRAY_TYPE(Type, array, num) \ DEFINE_INDEX_OPERATOR(const, Type, array, num) \ DEFINE_INDEX_OPERATOR( , Type, array, num) \ DEFINE_LEN_AND_SIZE(Type, array, num) #define DEFINE_INDEX_OPERATOR(const, Type, array, num) \ inline const Type& operator[] (unsigned int i) const { \ assert (i < num); \ return array[i]; \ } /* An offset array type is like an array type, but it contains a table * of offsets to the objects, relative to the beginning of the current * object. */ #define DEFINE_OFFSET_ARRAY_TYPE(Type, array, num) \ DEFINE_OFFSET_INDEX_OPERATOR(const, Type, array, num) \ DEFINE_OFFSET_INDEX_OPERATOR( , Type, array, num) \ DEFINE_LEN_AND_SIZE(Offset, array, num) #define DEFINE_OFFSET_INDEX_OPERATOR(const, Type, array, num) \ inline const Type& operator[] (unsigned int i) const { \ assert (i < num); \ assert (array[i]); \ return *(const Type *)((const char*)this + array[i]); \ } #define DEFINE_RECORD_ARRAY_TYPE(Type, array, num) \ DEFINE_RECORD_ACCESSOR(const, Type, array, num) \ DEFINE_RECORD_ACCESSOR( , Type, array, num) \ DEFINE_LEN_AND_SIZE(Record, array, num) #define DEFINE_RECORD_ACCESSOR(const, Type, array, num) \ inline const Type& operator[] (unsigned int i) const { \ assert (i < num); \ assert (array[i].offset); \ return *(const Type *)((const char*)this + array[i].offset); \ } \ inline const Tag& get_tag (unsigned int i) const { \ assert (i < num); \ return array[i].tag; \ } \ /* TODO: implement find_tag() */ /* * * The OpenType Font File * */ /* * Data Types */ /* "The following data types are used in the OpenType font file. * All OpenType fonts use Motorola-style byte ordering (Big Endian):" */ DEFINE_INT_TYPE (BYTE, u, 8); /* 8-bit unsigned integer. */ DEFINE_INT_TYPE (CHAR, , 8); /* 8-bit signed integer. */ DEFINE_INT_TYPE (USHORT, u, 16); /* 16-bit unsigned integer. */ DEFINE_INT_TYPE (SHORT, , 16); /* 16-bit signed integer. */ DEFINE_INT_TYPE (ULONG, u, 32); /* 32-bit unsigned integer. */ DEFINE_INT_TYPE (LONG, , 32); /* 32-bit signed integer. */ /* Date represented in number of seconds since 12:00 midnight, January 1, * 1904. The value is represented as a signed 64-bit integer. */ DEFINE_INT_TYPE (LONGDATETIME, , 64); /* 32-bit signed fixed-point number (16.16) */ struct Fixed : LONG { inline operator double(void) const { return (uint32_t) this / 65536.; } inline int16_t int_part (void) const { return (uint32_t) this >> 16; } inline int16_t frac_part (void) const { return (uint32_t) this & 0xffff; } }; /* Smallest measurable distance in the em space. */ struct FUNIT; /* 16-bit signed integer (SHORT) that describes a quantity in FUnits. */ struct FWORD : SHORT { }; /* 16-bit unsigned integer (USHORT) that describes a quantity in FUnits. */ struct UFWORD : USHORT { }; /* 16-bit signed fixed number with the low 14 bits of fraction (2.14). */ struct F2DOT14 : SHORT { inline operator double() const { return (uint32_t) this / 16384.; } }; /* Array of four uint8s (length = 32 bits) used to identify a script, language * system, feature, or baseline */ struct Tag { inline Tag (void) { v[0] = v[1] = v[2] = v[3] = 0; } inline Tag (uint32_t v) { (ULONG&)(*this) = v; } inline Tag (const char *c) { v[0] = c[0]; v[1] = c[1]; v[2] = c[2]; v[3] = c[3]; } inline bool operator== (Tag o) const { return v[0]==o.v[0]&&v[1]==o.v[1]&&v[2]==o.v[2]&&v[3]==o.v[3]; } inline operator uint32_t(void) const { return (v[0]<<24)+(v[1]<<16) +(v[2]<<8)+v[3]; } /* What the char* converters return is NOT nul-terminated. Print using "%.4s" */ inline operator const char* (void) const { return (const char *)this; } inline operator char* (void) { return (char *)this; } private: char v[4]; }; /* Glyph index number, same as uint16 (length = 16 bits) */ struct GlyphID : USHORT { }; /* Offset to a table, same as uint16 (length = 16 bits), NULL offset = 0x0000 */ struct Offset : USHORT { }; /* CheckSum */ struct CheckSum : ULONG { static uint32_t CalcTableChecksum (ULONG *Table, uint32_t Length) { uint32_t Sum = 0L; ULONG *EndPtr = Table+((Length+3) & ~3) / sizeof(ULONG); while (Table < EndPtr) Sum += *Table++; return Sum; } }; /* * Version Numbers */ struct USHORT_Version : USHORT { }; struct Fixed_Version : Fixed { inline int16_t major (void) const { return this->int_part(); } inline int16_t minor (void) const { return this->frac_part(); } }; /* * Organization of an OpenType Font */ struct OpenTypeFontFile; struct OffsetTable; struct TTCHeader; typedef struct TableDirectory { Tag tag; /* 4-byte identifier. */ CheckSum checkSum; /* CheckSum for this table. */ ULONG offset; /* Offset from beginning of TrueType font * file. */ ULONG length; /* Length of this table. */ } OpenTypeTable; typedef struct OffsetTable { DEFINE_NOT_INSTANTIABLE(OffsetTable); /* OpenTypeTables, in no particular order */ DEFINE_ARRAY_TYPE (TableDirectory, tableDir, numTables); // TODO: Implement find_table Tag sfnt_version; /* '\0\001\0\00' if TrueType / 'OTTO' if CFF */ USHORT numTables; /* Number of tables. */ USHORT searchRange; /* (Maximum power of 2 <= numTables) x 16 */ USHORT entrySelector; /* Log2(maximum power of 2 <= numTables). */ USHORT rangeShift; /* NumTables x 16-searchRange. */ TableDirectory tableDir[]; /* TableDirectory entries. numTables items */ } OpenTypeFont; /* * TrueType Collections */ struct TTCHeader { DEFINE_NOT_INSTANTIABLE(TTCHeader); /* OpenTypeFonts, in no particular order */ DEFINE_OFFSET_ARRAY_TYPE (OffsetTable, offsetTable, numFonts); Tag TTCTag; /* TrueType Collection ID string: 'ttcf' */ ULONG version; /* Version of the TTC Header (1.0 or 2.0), * 0x00010000 or 0x00020000 */ ULONG numFonts; /* Number of fonts in TTC */ ULONG offsetTable[]; /* Array of offsets to the OffsetTable for each font * from the beginning of the file. * numFonts entries long. */ }; /* * OpenType Font File */ typedef struct OpenTypeFontFile { DEFINE_NOT_INSTANTIABLE(OpenTypeFontFile); static const hb_tag_t TrueTypeTag = HB_TAG ( 0 , 1 , 0 , 0 ); static const hb_tag_t CFFTag = HB_TAG ('O','T','T','O'); static const hb_tag_t TTCTag = HB_TAG ('t','t','c','f'); /* Factory: ::get(font_data) * This is how you get a handle to one of these */ static inline const OpenTypeFontFile& get (const char *font_data) { return (const OpenTypeFontFile&)*font_data; } static inline OpenTypeFontFile& get (char *font_data) { return (OpenTypeFontFile&)*font_data; } /* Array interface sans get_size() */ inline unsigned int get_len (void) const { switch (tag) { default: return 0; case TrueTypeTag: case CFFTag: return 1; case TTCTag: return ((const TTCHeader&)*this).get_len(); } } inline const OpenTypeFont& operator[] (unsigned int i) const { assert (i < get_len ()); switch (tag) { default: case TrueTypeTag: case CFFTag: return (const OffsetTable&)*this; case TTCTag: return ((const TTCHeader&)*this)[i]; } } inline OpenTypeFont& operator[] (unsigned int i) { assert (i < get_len ()); switch (tag) { default: case TrueTypeTag: case CFFTag: return (OffsetTable&)*this; case TTCTag: return ((TTCHeader&)*this)[i]; } } Tag tag; /* 4-byte identifier. */ }; /* * * OpenType Layout Common Table Formats * */ struct Script; struct LangSys; typedef struct Record { Tag tag; /* 4-byte Tag identifier */ Offset offset; /* Offset from beginning of object holding * the Record */ } ScriptRecord, LangSysRecord, FeatureRecord; struct Script; struct ScriptList { DEFINE_NOT_INSTANTIABLE(ScriptList); /* Scripts, in sorted alphabetical order */ DEFINE_RECORD_ARRAY_TYPE (Script, scriptRecord, scriptCount); USHORT scriptCount; /* Number of ScriptRecords */ ScriptRecord scriptRecord[]; /* Array of ScriptRecords--listed alphabetically * by ScriptTag. scriptCount entries long */ }; struct Script { DEFINE_NOT_INSTANTIABLE(Script); /* LangSys', in sorted alphabetical order */ DEFINE_RECORD_ARRAY_TYPE (LangSys, langSysRecord, langSysCount); /* Return NULL if none */ inline const LangSys* get_default_language_system (void) const { if (!defaultLangSys) return NULL; return (const LangSys *)((const char*)this + defaultLangSys); } inline LangSys* get_default_language_system (void) { if (!defaultLangSys) return NULL; return (LangSys *)((char*)this + defaultLangSys); } Offset defaultLangSys; /* Offset to DefaultLangSys table--from * beginning of Script table--may be NULL */ USHORT langSysCount; /* Number of LangSysRecords for this script-- * excluding the DefaultLangSys */ LangSysRecord langSysRecord[];/* Array of LangSysRecords--listed * alphabetically by LangSysTag */ }; struct LangSys { DEFINE_NOT_INSTANTIABLE(LangSys); /* FeatureIndexes, in no particular order */ DEFINE_ARRAY_TYPE (USHORT, featureIndex, featureCount); /* Returns -1 if none */ inline int get_required_feature_index (void) const { if (reqFeatureIndex == 0xffff) return -1; return reqFeatureIndex;; } Offset lookupOrder; /* = NULL (reserved for an offset to a * reordering table) */ USHORT reqFeatureIndex;/* Index of a feature required for this * language system--if no required features * = 0xFFFF */ USHORT featureCount; /* Number of FeatureIndex values for this * language system--excludes the required * feature */ USHORT featureIndex[]; /* Array of indices into the FeatureList--in * arbitrary order */ }; #include #include int main (int argc, char **argv) { if (argc != 2) { fprintf (stderr, "usage: %s font-file.ttf\n", argv[0]); exit (1); } GMappedFile *mf = g_mapped_file_new (argv[1], FALSE, NULL); const char *font_data = g_mapped_file_get_contents (mf); int len = g_mapped_file_get_length (mf); printf ("Opened font file %s: %d bytes long\n", argv[1], len); const OpenTypeFontFile &ot = OpenTypeFontFile::get (font_data); switch (ot.tag) { case OpenTypeFontFile::TrueTypeTag: printf ("OpenType font with TrueType outlines\n"); break; case OpenTypeFontFile::CFFTag: printf ("OpenType font with CFF (Type1) outlines\n"); break; case OpenTypeFontFile::TTCTag: printf ("TrueType Collection of OpenType fonts\n"); break; default: printf ("Unknown font format\n"); break; } int num_fonts = ot.get_len (); printf ("%d font(s) found in file\n", num_fonts); for (int n_font = 0; n_font < num_fonts; n_font++) { const OpenTypeFont &font = ot[n_font]; printf ("Font %d of %d:\n", n_font+1, num_fonts); int num_tables = font.get_len (); printf ("%d table(s) found in font\n", num_tables); for (int n_table = 0; n_table < num_tables; n_table++) { const OpenTypeTable &table = font[n_table]; printf ("Table %2d of %2d: %.4s (0x%06x+0x%06x)\n", n_table+1, num_tables, (const char *)table.tag, (int)table.offset, (int)table.length); } } Tag a; a == ((Tag)"1234"); return 0; }