Second version. Complete redesign, based on C++ classes to ensure endian
correctness.
This commit is contained in:
Behdad Esfahbod
parent
f78e70c301
commit
6b4ce01da1
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@ -1,4 +1,5 @@
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#include <stdint.h>
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#include <glib.h>
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/*
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*
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@ -6,111 +7,220 @@
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*
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*/
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/*
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* Data Types:
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* Data Types
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*/
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/* "All OpenType fonts use Motorola-style byte ordering (Big Endian)"
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* So we define the following hb_be_* types as structs/unions, to
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* disallow accidental access to them as an integer. */
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typedef union {
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uint8_t u8;
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uint8_t v;
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} hb_be_uint8_t;
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typedef union {
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int8_t i8;
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int8_t v;
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} hb_be_int8_t;
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typedef union {
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uint8_t u8x2[2];
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uint16_t u16;
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uint16_t v;
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} hb_be_uint16_t;
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typedef union {
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uint8_t u8x2[2];
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int16_t i16;
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int16_t v;
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} hb_be_int16_t;
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typedef union {
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uint8_t u8x4[4];
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uint16_t u16x2[2];
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uint32_t u32;
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uint32_t v;
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inline operator int () { return (u8x4[0]<<24)+(u8x4[1]<<16)+(u8x4[2]<<8)+u8x4[3]; }
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} hb_be_uint32_t;
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typedef union {
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uint8_t u8x4[4];
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uint16_t u16x2[2];
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int32_t i32;
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int32_t v;
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} hb_be_int32_t;
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typedef union {
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uint8_t u8x8[8];
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uint16_t u16x4[4];
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uint32_t u32x2[2];
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uint64_t u64;
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uint64_t v;
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} hb_be_uint64_t;
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typedef union {
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uint8_t u8x8[8];
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uint16_t u16x4[4];
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uint32_t u32x2[2];
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int64_t i64;
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int64_t v;
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} hb_be_int64_t;
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/* "The following data types are used in the OpenType font file.
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* All OpenType fonts use Motorola-style byte ordering (Big Endian):" */
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/* Macros to convert to/from BigEndian */
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#define hb_be_uint8_t
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#define hb_be_int8_t
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#define hb_be_uint16_t GUINT16_TO_BE
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#define hb_be_int16_t GINT16_TO_BE
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#define hb_be_uint32_t GUINT32_TO_BE
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#define hb_be_int32_t GINT32_TO_BE
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#define hb_be_uint64_t GUINT64_TO_BE
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#define hb_be_int64_t GINT64_TO_BE
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#define DEFINE_INT_TYPE1(NAME, TYPE, BIG_ENDIAN) \
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struct NAME { \
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inline NAME (TYPE i) { v = BIG_ENDIAN(i); } \
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inline TYPE operator = (TYPE i) { v = BIG_ENDIAN(i); return i; } \
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inline operator TYPE(void) { return BIG_ENDIAN(v); } \
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private: TYPE v; \
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}
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#define DEFINE_INT_TYPE0(NAME, type) DEFINE_INT_TYPE1 (NAME, type, hb_be_##type)
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#define DEFINE_INT_TYPE(NAME, u, w) DEFINE_INT_TYPE0 (NAME, u##int##w##_t)
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DEFINE_INT_TYPE (HB_BYTE, u, 8); /* 8-bit unsigned integer. */
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DEFINE_INT_TYPE (HB_CHAR, , 8); /* 8-bit signed integer. */
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DEFINE_INT_TYPE (HB_USHORT, u, 16); /* 16-bit unsigned integer. */
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DEFINE_INT_TYPE (HB_SHORT, , 16); /* 16-bit signed integer. */
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DEFINE_INT_TYPE (HB_ULONG, u, 32); /* 32-bit unsigned integer. */
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DEFINE_INT_TYPE (HB_LONG, , 32); /* 32-bit signed integer. */
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/* Date represented in number of seconds since 12:00 midnight, January 1,
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* 1904. The value is represented as a signed 64-bit integer. */
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DEFINE_INT_TYPE (HB_LONGDATETIME, , 64);
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/* 32-bit signed fixed-point number (16.16) */
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struct HB_Fixed : HB_LONG {
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inline operator double(void) { return (uint32_t) this / 65536.; }
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inline int16_t int_part (void) { return (uint32_t) this >> 16; }
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inline int16_t frac_part (void) { return (uint32_t) this & 0xffff; }
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};
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/* Smallest measurable distance in the em space. */
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struct HB_FUNIT;
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/* 16-bit signed integer (SHORT) that describes a quantity in FUnits. */
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struct HB_FWORD : HB_SHORT {
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};
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/* 16-bit unsigned integer (USHORT) that describes a quantity in FUnits. */
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struct HB_UFWORD : HB_USHORT {
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};
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/* 16-bit signed fixed number with the low 14 bits of fraction (2.14). */
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struct HB_F2DOT14 : HB_SHORT {
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inline operator double() { return (uint32_t) this / 16384.; }
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};
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/* Array of four uint8s (length = 32 bits) used to identify a script, language
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* system, feature, or baseline */
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struct HB_Tag : public HB_ULONG {
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inline HB_Tag (char *c) : HB_ULONG(c ? *(uint32_t*)c : 0) {}
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};
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/* Glyph index number, same as uint16 (length = 16 bits) */
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struct HB_GlyphID : HB_USHORT {
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};
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/* Offset to a table, same as uint16 (length = 16 bits), NULL offset = 0x0000 */
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struct HB_Offset : HB_USHORT {
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};
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/* CheckSum */
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struct HB_CheckSum : HB_ULONG {
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static uint32_t CalcTableChecksum (HB_ULONG *Table, uint32_t Length) {
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uint32_t Sum = 0L;
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HB_ULONG *EndPtr = Table+((Length+3) & ~3) / sizeof(HB_ULONG);
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while (Table < EndPtr)
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Sum += *Table++;
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return Sum;
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}
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};
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/*
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* Version Numbers
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*/
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struct HB_USHORT_Version : HB_USHORT {
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};
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struct HB_Fixed_Version : HB_Fixed {
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inline int16_t major (void) { return this->int_part(); }
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inline int16_t minor (void) { return this->frac_part(); }
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};
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/*
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* Organization of an OpenType Font
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*/
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/* Offset Table */
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struct HB_OffsetTable {
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HB_Fixed_Version sfnt_version; /* 0x00010000 for version 1.0. */
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HB_USHORT numTables; /* Number of tables. */
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HB_USHORT searchRange; /* (Maximum power of 2 <= numTables)
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* x 16 */
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HB_USHORT entrySelector; /* Log2(maximum power of 2 <=
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* numTables). */
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HB_USHORT rangeShift; /* NumTables x 16-searchRange. */
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};
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/* Table Directory */
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struct HB_TableDirectory {
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HB_Tag tag; /* 4-byte identifier. */
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HB_CheckSum checkSum; /* CheckSum for this table. */
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HB_ULONG offset; /* Offset from beginning of TrueType font
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* file. */
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HB_ULONG length; /* Length of this table. */
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};
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/*
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* TrueType Collections
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*/
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/* TTC Header Version 1.0 */
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struct HB_TTCHeader {
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HB_Tag TTCTag; /* TrueType Collection ID string: 'ttcf' */
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HB_ULONG version; /* Version of the TTC Header (1.0 or 2.0),
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* 0x00010000 or 0x00020000 */
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HB_ULONG numFonts; /* Number of fonts in TTC */
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HB_ULONG offsetTable[0]; /* Array of offsets to the OffsetTable for
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* each font from the beginning of the file.
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* numFonts entries long. */
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inline int len(void) { return sizeof (HB_TTCHeader)
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+ sizeof (HB_ULONG) * numFonts; }
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};
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/* TTC Header Version 2.0 tail
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* Follows after HB_TTCHeader with appropriate size for the offsetTable. */
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struct HB_TTCHeaderVersion2Tail {
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HB_ULONG ulDsigTag; /* Tag indicating that a DSIG table exists,
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* 0x44534947 ('DSIG') (null if no signature) */
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HB_ULONG ulDsigLength; /* The length (in bytes) of the DSIG table
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* (null if no signature) */
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HB_ULONG ulDsigOffset; /* The offset (in bytes) of the DSIG table
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* from the beginning of the TTC file (null if
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* no signature) */
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};
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/*
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*
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* OpenType Layout Common Table Formats
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*
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*/
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/*
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* Script List Table and Script Record
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*/
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struct ScriptRecord {
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Tag scriptTag; /* 4-byte ScriptTag identifier */
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Offset scriptOffset; /* Offset to Script table--from beginning of
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* ScriptList */
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};
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struct ScriptList {
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USHORT scriptCount; /* Number of ScriptRecords */
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ScriptRecord scriptRecord[]; /* Array of ScriptRecords--listed alphabetically
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* by ScriptTag. scriptCount entries long */
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inline int len(void) { return sizeof (ScriptList)
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+ sizeof (ScriptRecord) * scriptCount; }
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};
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/* "The following data types are used in the OpenType font file." */
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typedef hb_be_uint8_t HB_BYTE; /* 8-bit unsigned integer. */
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typedef hb_be_int8_t HB_CHAR; /* 8-bit signed integer. */
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typedef hb_be_uint16_t HB_USHORT; /* 16-bit unsigned integer. */
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typedef hb_be_int16_t HB_SHORT; /* 16-bit signed integer. */
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typedef hb_be_uint32_t HB_ULONG; /* 32-bit unsigned integer. */
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typedef hb_be_int32_t HB_LONG; /* 32-bit signed integer. */
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typedef hb_be_int32_t HB_Fixed; /* 32-bit signed fixed-point number
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* (16.16) */
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typedef struct _FUNIT HB_FUNIT; /* Smallest measurable distance
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* in the em space. */
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typedef HB_SHORT HB_FWORD; /* 16-bit signed integer (SHORT) that
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* describes a quantity in FUnits. */
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typedef HB_USHORT HB_UFWORD; /* 16-bit unsigned integer (USHORT)
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* that describes a quantity in
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* FUnits. */
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typedef hb_be_int16_t HB_F2DOT14; /* 16-bit signed fixed number with the
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* low 14 bits of fraction (2.14). */
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typedef hb_be_int64_t HB_LONGDATETIME;/* Date represented in number of
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* seconds since 12:00 midnight,
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* January 1, 1904. The value is
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* represented as a signed 64-bit
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* integer. */
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typedef hb_be_uint32_t HB_Tag; /* Array of four uint8s (length = 32
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* bits) used to identify a script,
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* language system, feature, or
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* baseline */
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typedef hb_be_uint16_t HB_GlyphID; /* Glyph index number, same as
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* uint16(length = 16 bits) */
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typedef hb_be_uint16_t HB_Offset; /* Offset to a table, same as uint16
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* (length = 16 bits), NULL offset =
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* 0x0000 */
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#include <stdio.h>
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int
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main (void)
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{
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HB_Tag x = {{'a', 'b', 'c', 'd'}};
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HB_ULONG y = x;
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HB_Tag y("abcd");
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HB_Tag &x = y;
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HB_BYTE b(0);
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printf ("%d\n", x+0);
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printf ("%d %04x %04x\n", sizeof (x), x+0, y+0);
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return 0;
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}
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