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harfbuzz /
hb-cff-interp-common.hh
/*
* Copyright 漏 2018 Adobe Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Adobe Author(s): Michiharu Ariza
*/
#ifndef HB_CFF_INTERP_COMMON_HH
#define HB_CFF_INTERP_COMMON_HH
namespace CFF {
using namespace OT;
typedef unsigned int op_code_t;
/* === Dict operators === */
/* One byte operators (0-31) */
#define OpCode_version 0 /* CFF Top */
#define OpCode_Notice 1 /* CFF Top */
#define OpCode_FullName 2 /* CFF Top */
#define OpCode_FamilyName 3 /* CFF Top */
#define OpCode_Weight 4 /* CFF Top */
#define OpCode_FontBBox 5 /* CFF Top */
#define OpCode_BlueValues 6 /* CFF Private, CFF2 Private */
#define OpCode_OtherBlues 7 /* CFF Private, CFF2 Private */
#define OpCode_FamilyBlues 8 /* CFF Private, CFF2 Private */
#define OpCode_FamilyOtherBlues 9 /* CFF Private, CFF2 Private */
#define OpCode_StdHW 10 /* CFF Private, CFF2 Private */
#define OpCode_StdVW 11 /* CFF Private, CFF2 Private */
#define OpCode_escape 12 /* All. Shared with CS */
#define OpCode_UniqueID 13 /* CFF Top */
#define OpCode_XUID 14 /* CFF Top */
#define OpCode_charset 15 /* CFF Top (0) */
#define OpCode_Encoding 16 /* CFF Top (0) */
#define OpCode_CharStrings 17 /* CFF Top, CFF2 Top */
#define OpCode_Private 18 /* CFF Top, CFF2 FD */
#define OpCode_Subrs 19 /* CFF Private, CFF2 Private */
#define OpCode_defaultWidthX 20 /* CFF Private (0) */
#define OpCode_nominalWidthX 21 /* CFF Private (0) */
#define OpCode_vsindexdict 22 /* CFF2 Private/CS */
#define OpCode_blenddict 23 /* CFF2 Private/CS */
#define OpCode_vstore 24 /* CFF2 Top */
#define OpCode_reserved25 25
#define OpCode_reserved26 26
#define OpCode_reserved27 27
/* Numbers */
#define OpCode_shortint 28 /* 16-bit integer, All */
#define OpCode_longintdict 29 /* 32-bit integer, All */
#define OpCode_BCD 30 /* Real number, CFF2 Top/FD */
#define OpCode_reserved31 31
/* 1-byte integers */
#define OpCode_OneByteIntFirst 32 /* All. beginning of the range of first byte ints */
#define OpCode_OneByteIntLast 246 /* All. ending of the range of first byte int */
/* 2-byte integers */
#define OpCode_TwoBytePosInt0 247 /* All. first byte of two byte positive int (+108 to +1131) */
#define OpCode_TwoBytePosInt1 248
#define OpCode_TwoBytePosInt2 249
#define OpCode_TwoBytePosInt3 250
#define OpCode_TwoByteNegInt0 251 /* All. first byte of two byte negative int (-1131 to -108) */
#define OpCode_TwoByteNegInt1 252
#define OpCode_TwoByteNegInt2 253
#define OpCode_TwoByteNegInt3 254
/* Two byte escape operators 12, (0-41) */
#define OpCode_ESC_Base 256
#define Make_OpCode_ESC(byte2) ((op_code_t)(OpCode_ESC_Base + (byte2)))
inline op_code_t Unmake_OpCode_ESC (op_code_t op) { return (op_code_t)(op - OpCode_ESC_Base); }
inline bool Is_OpCode_ESC (op_code_t op) { return op >= OpCode_ESC_Base; }
inline unsigned int OpCode_Size (op_code_t op) { return Is_OpCode_ESC (op) ? 2: 1; }
#define OpCode_Copyright Make_OpCode_ESC(0) /* CFF Top */
#define OpCode_isFixedPitch Make_OpCode_ESC(1) /* CFF Top (false) */
#define OpCode_ItalicAngle Make_OpCode_ESC(2) /* CFF Top (0) */
#define OpCode_UnderlinePosition Make_OpCode_ESC(3) /* CFF Top (-100) */
#define OpCode_UnderlineThickness Make_OpCode_ESC(4) /* CFF Top (50) */
#define OpCode_PaintType Make_OpCode_ESC(5) /* CFF Top (0) */
#define OpCode_CharstringType Make_OpCode_ESC(6) /* CFF Top (2) */
#define OpCode_FontMatrix Make_OpCode_ESC(7) /* CFF Top, CFF2 Top (.001 0 0 .001 0 0)*/
#define OpCode_StrokeWidth Make_OpCode_ESC(8) /* CFF Top (0) */
#define OpCode_BlueScale Make_OpCode_ESC(9) /* CFF Private, CFF2 Private (0.039625) */
#define OpCode_BlueShift Make_OpCode_ESC(10) /* CFF Private, CFF2 Private (7) */
#define OpCode_BlueFuzz Make_OpCode_ESC(11) /* CFF Private, CFF2 Private (1) */
#define OpCode_StemSnapH Make_OpCode_ESC(12) /* CFF Private, CFF2 Private */
#define OpCode_StemSnapV Make_OpCode_ESC(13) /* CFF Private, CFF2 Private */
#define OpCode_ForceBold Make_OpCode_ESC(14) /* CFF Private (false) */
#define OpCode_reservedESC15 Make_OpCode_ESC(15)
#define OpCode_reservedESC16 Make_OpCode_ESC(16)
#define OpCode_LanguageGroup Make_OpCode_ESC(17) /* CFF Private, CFF2 Private (0) */
#define OpCode_ExpansionFactor Make_OpCode_ESC(18) /* CFF Private, CFF2 Private (0.06) */
#define OpCode_initialRandomSeed Make_OpCode_ESC(19) /* CFF Private (0) */
#define OpCode_SyntheticBase Make_OpCode_ESC(20) /* CFF Top */
#define OpCode_PostScript Make_OpCode_ESC(21) /* CFF Top */
#define OpCode_BaseFontName Make_OpCode_ESC(22) /* CFF Top */
#define OpCode_BaseFontBlend Make_OpCode_ESC(23) /* CFF Top */
#define OpCode_reservedESC24 Make_OpCode_ESC(24)
#define OpCode_reservedESC25 Make_OpCode_ESC(25)
#define OpCode_reservedESC26 Make_OpCode_ESC(26)
#define OpCode_reservedESC27 Make_OpCode_ESC(27)
#define OpCode_reservedESC28 Make_OpCode_ESC(28)
#define OpCode_reservedESC29 Make_OpCode_ESC(29)
#define OpCode_ROS Make_OpCode_ESC(30) /* CFF Top_CID */
#define OpCode_CIDFontVersion Make_OpCode_ESC(31) /* CFF Top_CID (0) */
#define OpCode_CIDFontRevision Make_OpCode_ESC(32) /* CFF Top_CID (0) */
#define OpCode_CIDFontType Make_OpCode_ESC(33) /* CFF Top_CID (0) */
#define OpCode_CIDCount Make_OpCode_ESC(34) /* CFF Top_CID (8720) */
#define OpCode_UIDBase Make_OpCode_ESC(35) /* CFF Top_CID */
#define OpCode_FDArray Make_OpCode_ESC(36) /* CFF Top_CID, CFF2 Top */
#define OpCode_FDSelect Make_OpCode_ESC(37) /* CFF Top_CID, CFF2 Top */
#define OpCode_FontName Make_OpCode_ESC(38) /* CFF Top_CID */
/* === CharString operators === */
#define OpCode_hstem 1 /* CFF, CFF2 */
#define OpCode_Reserved2 2
#define OpCode_vstem 3 /* CFF, CFF2 */
#define OpCode_vmoveto 4 /* CFF, CFF2 */
#define OpCode_rlineto 5 /* CFF, CFF2 */
#define OpCode_hlineto 6 /* CFF, CFF2 */
#define OpCode_vlineto 7 /* CFF, CFF2 */
#define OpCode_rrcurveto 8 /* CFF, CFF2 */
#define OpCode_Reserved9 9
#define OpCode_callsubr 10 /* CFF, CFF2 */
#define OpCode_return 11 /* CFF */
//#define OpCode_escape 12 /* CFF, CFF2 */
#define OpCode_Reserved13 13
#define OpCode_endchar 14 /* CFF */
#define OpCode_vsindexcs 15 /* CFF2 */
#define OpCode_blendcs 16 /* CFF2 */
#define OpCode_Reserved17 17
#define OpCode_hstemhm 18 /* CFF, CFF2 */
#define OpCode_hintmask 19 /* CFF, CFF2 */
#define OpCode_cntrmask 20 /* CFF, CFF2 */
#define OpCode_rmoveto 21 /* CFF, CFF2 */
#define OpCode_hmoveto 22 /* CFF, CFF2 */
#define OpCode_vstemhm 23 /* CFF, CFF2 */
#define OpCode_rcurveline 24 /* CFF, CFF2 */
#define OpCode_rlinecurve 25 /* CFF, CFF2 */
#define OpCode_vvcurveto 26 /* CFF, CFF2 */
#define OpCode_hhcurveto 27 /* CFF, CFF2 */
//#define OpCode_shortint 28 /* CFF, CFF2 */
#define OpCode_callgsubr 29 /* CFF, CFF2 */
#define OpCode_vhcurveto 30 /* CFF, CFF2 */
#define OpCode_hvcurveto 31 /* CFF, CFF2 */
#define OpCode_fixedcs 255 /* 32-bit fixed */
/* Two byte escape operators 12, (0-41) */
#define OpCode_dotsection Make_OpCode_ESC(0) /* CFF (obsoleted) */
#define OpCode_ReservedESC1 Make_OpCode_ESC(1)
#define OpCode_ReservedESC2 Make_OpCode_ESC(2)
#define OpCode_and Make_OpCode_ESC(3) /* CFF */
#define OpCode_or Make_OpCode_ESC(4) /* CFF */
#define OpCode_not Make_OpCode_ESC(5) /* CFF */
#define OpCode_ReservedESC6 Make_OpCode_ESC(6)
#define OpCode_ReservedESC7 Make_OpCode_ESC(7)
#define OpCode_ReservedESC8 Make_OpCode_ESC(8)
#define OpCode_abs Make_OpCode_ESC(9) /* CFF */
#define OpCode_add Make_OpCode_ESC(10) /* CFF */
#define OpCode_sub Make_OpCode_ESC(11) /* CFF */
#define OpCode_div Make_OpCode_ESC(12) /* CFF */
#define OpCode_ReservedESC13 Make_OpCode_ESC(13)
#define OpCode_neg Make_OpCode_ESC(14) /* CFF */
#define OpCode_eq Make_OpCode_ESC(15) /* CFF */
#define OpCode_ReservedESC16 Make_OpCode_ESC(16)
#define OpCode_ReservedESC17 Make_OpCode_ESC(17)
#define OpCode_drop Make_OpCode_ESC(18) /* CFF */
#define OpCode_ReservedESC19 Make_OpCode_ESC(19)
#define OpCode_put Make_OpCode_ESC(20) /* CFF */
#define OpCode_get Make_OpCode_ESC(21) /* CFF */
#define OpCode_ifelse Make_OpCode_ESC(22) /* CFF */
#define OpCode_random Make_OpCode_ESC(23) /* CFF */
#define OpCode_mul Make_OpCode_ESC(24) /* CFF */
//#define OpCode_reservedESC25 Make_OpCode_ESC(25)
#define OpCode_sqrt Make_OpCode_ESC(26) /* CFF */
#define OpCode_dup Make_OpCode_ESC(27) /* CFF */
#define OpCode_exch Make_OpCode_ESC(28) /* CFF */
#define OpCode_index Make_OpCode_ESC(29) /* CFF */
#define OpCode_roll Make_OpCode_ESC(30) /* CFF */
#define OpCode_reservedESC31 Make_OpCode_ESC(31)
#define OpCode_reservedESC32 Make_OpCode_ESC(32)
#define OpCode_reservedESC33 Make_OpCode_ESC(33)
#define OpCode_hflex Make_OpCode_ESC(34) /* CFF, CFF2 */
#define OpCode_flex Make_OpCode_ESC(35) /* CFF, CFF2 */
#define OpCode_hflex1 Make_OpCode_ESC(36) /* CFF, CFF2 */
#define OpCode_flex1 Make_OpCode_ESC(37) /* CFF, CFF2 */
#define OpCode_Invalid 0xFFFFu
struct number_t
{
void init () { set_real (0.0); }
void fini () {}
void set_int (int v) { value = (double) v; }
int to_int () const { return (int) value; }
void set_fixed (int32_t v) { value = v / 65536.0; }
int32_t to_fixed () const { return (int32_t) (value * 65536.0); }
void set_real (double v) { value = v; }
double to_real () const { return value; }
int ceil () const { return (int) ::ceil (value); }
int floor () const { return (int) ::floor (value); }
bool in_int_range () const
{ return ((double) (int16_t) to_int () == value); }
bool operator > (const number_t &n) const
{ return value > n.to_real (); }
bool operator < (const number_t &n) const
{ return n > *this; }
bool operator >= (const number_t &n) const
{ return !(*this < n); }
bool operator <= (const number_t &n) const
{ return !(*this > n); }
const number_t &operator += (const number_t &n)
{
set_real (to_real () + n.to_real ());
return *this;
}
protected:
double value;
};
/* byte string */
struct UnsizedByteStr : UnsizedArrayOf <HBUINT8>
{
// encode 2-byte int (Dict/CharString) or 4-byte int (Dict)
template <typename INTTYPE, int minVal, int maxVal>
static bool serialize_int (hb_serialize_context_t *c, op_code_t intOp, int value)
{
TRACE_SERIALIZE (this);
if (unlikely ((value < minVal || value > maxVal)))
return_trace (false);
HBUINT8 *p = c->allocate_size<HBUINT8> (1);
if (unlikely (p == nullptr)) return_trace (false);
p->set (intOp);
INTTYPE *ip = c->allocate_size<INTTYPE> (INTTYPE::static_size);
if (unlikely (ip == nullptr)) return_trace (false);
ip->set ((unsigned int)value);
return_trace (true);
}
static bool serialize_int4 (hb_serialize_context_t *c, int value)
{ return serialize_int<HBUINT32, 0, 0x7FFFFFFF> (c, OpCode_longintdict, value); }
static bool serialize_int2 (hb_serialize_context_t *c, int value)
{ return serialize_int<HBUINT16, 0, 0x7FFF> (c, OpCode_shortint, value); }
/* Defining null_size allows a Null object may be created. Should be safe because:
* A descendent struct Dict uses a Null pointer to indicate a missing table,
* checked before access.
* byte_str_t, a wrapper struct pairing a byte pointer along with its length, always
* checks the length before access. A Null pointer is used as the initial pointer
* along with zero length by the default ctor.
*/
DEFINE_SIZE_MIN(0);
};
/* Holder of a section of byte string within a CFFIndex entry */
struct byte_str_t : hb_ubytes_t
{
byte_str_t ()
: hb_ubytes_t () {}
byte_str_t (const UnsizedByteStr& s, unsigned int l)
: hb_ubytes_t ((const unsigned char*)&s, l) {}
byte_str_t (const unsigned char *s, unsigned int l)
: hb_ubytes_t (s, l) {}
byte_str_t (const hb_ubytes_t &ub) /* conversion from hb_ubytes_t */
: hb_ubytes_t (ub) {}
/* sub-string */
byte_str_t sub_str (unsigned int offset, unsigned int len_) const
{ return byte_str_t (hb_ubytes_t::sub_array (offset, len_)); }
bool check_limit (unsigned int offset, unsigned int count) const
{ return (offset + count <= length); }
};
/* A byte string associated with the current offset and an error condition */
struct byte_str_ref_t
{
byte_str_ref_t ()
{ init (); }
void init ()
{
str = byte_str_t ();
offset = 0;
error = false;
}
void fini () {}
byte_str_ref_t (const byte_str_t &str_, unsigned int offset_ = 0)
: str (str_), offset (offset_), error (false) {}
void reset (const byte_str_t &str_, unsigned int offset_ = 0)
{
str = str_;
offset = offset_;
error = false;
}
const unsigned char& operator [] (int i) {
if (unlikely ((unsigned int)(offset + i) >= str.length))
{
set_error ();
return Null(unsigned char);
}
else
return str[offset + i];
}
/* Conversion to byte_str_t */
operator byte_str_t () const { return str.sub_str (offset, str.length - offset); }
byte_str_t sub_str (unsigned int offset_, unsigned int len_) const
{ return str.sub_str (offset_, len_); }
bool avail (unsigned int count=1) const
{
return (!in_error () && str.check_limit (offset, count));
}
void inc (unsigned int count=1)
{
if (likely (!in_error () && (offset <= str.length) && (offset + count <= str.length)))
{
offset += count;
}
else
{
offset = str.length;
set_error ();
}
}
void set_error () { error = true; }
bool in_error () const { return error; }
byte_str_t str;
unsigned int offset; /* beginning of the sub-string within str */
protected:
bool error;
};
typedef hb_vector_t<byte_str_t> byte_str_array_t;
/* stack */
template <typename ELEM, int LIMIT>
struct stack_t
{
void init ()
{
error = false;
count = 0;
elements.init ();
elements.resize (kSizeLimit);
for (unsigned int i = 0; i < elements.length; i++)
elements[i].init ();
}
void fini ()
{
elements.fini_deep ();
}
ELEM& operator [] (unsigned int i)
{
if (unlikely (i >= count)) set_error ();
return elements[i];
}
void push (const ELEM &v)
{
if (likely (count < elements.length))
elements[count++] = v;
else
set_error ();
}
ELEM &push ()
{
if (likely (count < elements.length))
return elements[count++];
else
{
set_error ();
return Crap(ELEM);
}
}
ELEM& pop ()
{
if (likely (count > 0))
return elements[--count];
else
{
set_error ();
return Crap(ELEM);
}
}
void pop (unsigned int n)
{
if (likely (count >= n))
count -= n;
else
set_error ();
}
const ELEM& peek ()
{
if (likely (count > 0))
return elements[count-1];
else
{
set_error ();
return Null(ELEM);
}
}
void unpop ()
{
if (likely (count < elements.length))
count++;
else
set_error ();
}
void clear () { count = 0; }
bool in_error () const { return (error || elements.in_error ()); }
void set_error () { error = true; }
unsigned int get_count () const { return count; }
bool is_empty () const { return count == 0; }
static constexpr unsigned kSizeLimit = LIMIT;
protected:
bool error;
unsigned int count;
hb_vector_t<ELEM> elements;
};
/* argument stack */
template <typename ARG=number_t>
struct arg_stack_t : stack_t<ARG, 513>
{
void push_int (int v)
{
ARG &n = S::push ();
n.set_int (v);
}
void push_fixed (int32_t v)
{
ARG &n = S::push ();
n.set_fixed (v);
}
void push_real (double v)
{
ARG &n = S::push ();
n.set_real (v);
}
ARG& pop_num () { return this->pop (); }
int pop_int () { return this->pop ().to_int (); }
unsigned int pop_uint ()
{
int i = pop_int ();
if (unlikely (i < 0))
{
i = 0;
S::set_error ();
}
return (unsigned)i;
}
void push_longint_from_substr (byte_str_ref_t& str_ref)
{
push_int ((str_ref[0] << 24) | (str_ref[1] << 16) | (str_ref[2] << 8) | (str_ref[3]));
str_ref.inc (4);
}
bool push_fixed_from_substr (byte_str_ref_t& str_ref)
{
if (unlikely (!str_ref.avail (4)))
return false;
push_fixed ((int32_t)*(const HBUINT32*)&str_ref[0]);
str_ref.inc (4);
return true;
}
hb_array_t<const ARG> get_subarray (unsigned int start) const
{
return S::elements.sub_array (start);
}
private:
typedef stack_t<ARG, 513> S;
};
/* an operator prefixed by its operands in a byte string */
struct op_str_t
{
void init () {}
void fini () {}
op_code_t op;
byte_str_t str;
};
/* base of OP_SERIALIZER */
struct op_serializer_t
{
protected:
bool copy_opstr (hb_serialize_context_t *c, const op_str_t& opstr) const
{
TRACE_SERIALIZE (this);
HBUINT8 *d = c->allocate_size<HBUINT8> (opstr.str.length);
if (unlikely (d == nullptr)) return_trace (false);
memcpy (d, &opstr.str[0], opstr.str.length);
return_trace (true);
}
};
template <typename VAL>
struct parsed_values_t
{
void init ()
{
opStart = 0;
values.init ();
}
void fini () { values.fini_deep (); }
void add_op (op_code_t op, const byte_str_ref_t& str_ref = byte_str_ref_t ())
{
VAL *val = values.push ();
val->op = op;
val->str = str_ref.str.sub_str (opStart, str_ref.offset - opStart);
opStart = str_ref.offset;
}
void add_op (op_code_t op, const byte_str_ref_t& str_ref, const VAL &v)
{
VAL *val = values.push (v);
val->op = op;
val->str = str_ref.sub_str ( opStart, str_ref.offset - opStart);
opStart = str_ref.offset;
}
bool has_op (op_code_t op) const
{
for (unsigned int i = 0; i < get_count (); i++)
if (get_value (i).op == op) return true;
return false;
}
unsigned get_count () const { return values.length; }
const VAL &get_value (unsigned int i) const { return values[i]; }
const VAL &operator [] (unsigned int i) const { return get_value (i); }
unsigned int opStart;
hb_vector_t<VAL> values;
};
template <typename ARG=number_t>
struct interp_env_t
{
void init (const byte_str_t &str_)
{
str_ref.reset (str_);
argStack.init ();
error = false;
}
void fini () { argStack.fini (); }
bool in_error () const
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