#include <stdint.h>
+#include <assert.h>
#include <glib.h>
-/*
- *
- * 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):" */
/* Macros to convert to/from BigEndian */
#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 (TYPE i) { v = BIG_ENDIAN(i); } \
- inline TYPE operator = (TYPE i) { v = BIG_ENDIAN(i); return i; } \
- inline operator TYPE(void) { return BIG_ENDIAN(v); } \
+ 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)
+
+/* 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. */
/* 32-bit signed fixed-point number (16.16) */
struct Fixed : LONG {
- inline operator double(void) { return (uint32_t) this / 65536.; }
- inline int16_t int_part (void) { return (uint32_t) this >> 16; }
- inline int16_t frac_part (void) { return (uint32_t) this & 0xffff; }
+ 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. */
/* 16-bit signed fixed number with the low 14 bits of fraction (2.14). */
struct F2DOT14 : SHORT {
- inline operator double() { return (uint32_t) this / 16384.; }
+ 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 : public ULONG {
- inline Tag (char *c) : ULONG(c ? *(uint32_t*)c : 0) {}
+struct Tag {
+ inline Tag (void) { v[0] = v[1] = v[2] = v[3] = 0; }
+ inline Tag (char *c) { v[0] = c[0]; v[1] = c[1]; v[2] = c[2]; v[3] = c[3]; }
+ inline operator uint32_t(void) const { return (v[0]<<24)+(v[1]<<16) +(v[2]<<8)+v[3]; } \
+ private: char v[4];
};
/* Glyph index number, same as uint16 (length = 16 bits) */
};
-
/*
* Version Numbers
*/
-
struct USHORT_Version : USHORT {
};
struct Fixed_Version : Fixed {
- inline int16_t major (void) { return this->int_part(); }
- inline int16_t minor (void) { return this->frac_part(); }
+ 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
*/
-
-/* Offset Table */
-struct OffsetTable {
- Fixed_Version sfnt_version; /* 0x00010000 for version 1.0. */
- 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. */
-};
-
-
-/* Table Directory */
struct TableDirectory {
Tag tag; /* 4-byte identifier. */
CheckSum checkSum; /* CheckSum for this table. */
ULONG length; /* Length of this table. */
};
+struct OffsetTable {
+ DEFINE_ARRAY_TYPE (TableDirectory, tableDir, numTables);
+
+ 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 */
+
+};
/*
* TrueType Collections
*/
-
-/* TTC Header Version 1.0 */
struct TTCHeader {
+ /* This works as an array type because TTCHeader is always located at the
+ * beginning of the file */
+ 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[0]; /* Array of offsets to the OffsetTable for each font
+ ULONG offsetTable[]; /* Array of offsets to the OffsetTable for each font
* from the beginning of the file.
* numFonts entries long. */
-
- inline int len(void) { return sizeof (TTCHeader)
- + sizeof (ULONG) * numFonts; }
-};
-
-
-/* TTC Header Version 2.0 tail
- * Follows after TTCHeader with appropriate size for the offsetTable. */
-struct TTCHeaderVersion2Tail {
- ULONG ulDsigTag; /* Tag indicating that a DSIG table exists,
- * 0x44534947 ('DSIG') (null if no signature) */
- ULONG ulDsigLength; /* The length (in bytes) of the DSIG table (null if
- * no signature) */
- ULONG ulDsigOffset; /* The offset (in bytes) of the DSIG table from the
- * beginning of the TTC file (null if no signature) */
};
-
/*
*
* OpenType Layout Common Table Formats
*
*/
+struct Script;
+struct LangSys;
-/*
- * Script List Table and Script Record
- */
-struct ScriptRecord {
- Tag scriptTag; /* 4-byte ScriptTag identifier */
- Offset scriptOffset; /* Offset to Script table--from beginning of
- * ScriptList */
-};
+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_RECORD_ARRAY_TYPE (Script, scriptRecord, scriptCount);
+
USHORT scriptCount; /* Number of ScriptRecords */
ScriptRecord scriptRecord[]; /* Array of ScriptRecords--listed alphabetically
* by ScriptTag. scriptCount entries long */
-
- inline int len(void) { return sizeof (ScriptList)
- + sizeof (ScriptRecord) * scriptCount; }
};
+struct Script {
+ DEFINE_RECORD_ARRAY_TYPE (LangSys, langSysRecord, langSysCount);
+ 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 {
-
+};
#include <stdio.h>
int
main (void)
{
- Tag y("abcd");
- Tag &x = y;
- BYTE b(0);
+// Tag y("abcd");
+// Tag &x = y;
+// BYTE b(0);
- printf ("%d %04x %04x\n", sizeof (x), x+0, y+0);
+ printf ("%d\n", sizeof (ScriptList));//, x+0, y+0);
return 0;
}
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