harfbuzz/src/hb-ot-cff-common.hh

715 lines
20 KiB
C++

/*
* Copyright © 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_OT_CFF_COMMON_HH
#define HB_OT_CFF_COMMON_HH
#include "hb-open-type.hh"
#include "hb-ot-layout-common.hh"
#include "hb-cff-interp-dict-common.hh"
#include "hb-subset-plan.hh"
namespace CFF {
using namespace OT;
#define CFF_UNDEF_CODE 0xFFFFFFFF
/* utility macro */
template<typename Type>
static inline const Type& StructAtOffsetOrNull(const void *P, unsigned int offset)
{ return offset? (* reinterpret_cast<const Type*> ((const char *) P + offset)): Null(Type); }
inline unsigned int calcOffSize(unsigned int dataSize)
{
unsigned int size = 1;
unsigned int offset = dataSize + 1;
while ((offset & ~0xFF) != 0)
{
size++;
offset >>= 8;
}
/* format does not support size > 4; caller should handle it as an error */
return size;
}
struct code_pair_t
{
hb_codepoint_t code;
hb_codepoint_t glyph;
};
typedef hb_vector_t<unsigned char> str_buff_t;
struct str_buff_vec_t : hb_vector_t<str_buff_t>
{
void fini () { SUPER::fini_deep (); }
unsigned int total_size () const
{
unsigned int size = 0;
for (unsigned int i = 0; i < length; i++)
size += (*this)[i].length;
return size;
}
private:
typedef hb_vector_t<str_buff_t> SUPER;
};
/* CFF INDEX */
template <typename COUNT>
struct CFFIndex
{
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (likely ((count.sanitize (c) && count == 0) || /* empty INDEX */
(c->check_struct (this) && offSize >= 1 && offSize <= 4 &&
c->check_array (offsets, offSize, count + 1) &&
c->check_array ((const HBUINT8*)data_base (), 1, max_offset () - 1))));
}
static unsigned int calculate_offset_array_size (unsigned int offSize, unsigned int count)
{ return offSize * (count + 1); }
unsigned int offset_array_size () const
{ return calculate_offset_array_size (offSize, count); }
static unsigned int calculate_serialized_size (unsigned int offSize, unsigned int count, unsigned int dataSize)
{
if (count == 0)
return COUNT::static_size;
else
return min_size + calculate_offset_array_size (offSize, count) + dataSize;
}
bool serialize (hb_serialize_context_t *c, const CFFIndex &src)
{
TRACE_SERIALIZE (this);
unsigned int size = src.get_size ();
CFFIndex *dest = c->allocate_size<CFFIndex> (size);
if (unlikely (dest == nullptr)) return_trace (false);
memcpy (dest, &src, size);
return_trace (true);
}
bool serialize (hb_serialize_context_t *c,
unsigned int offSize_,
const byte_str_array_t &byteArray)
{
TRACE_SERIALIZE (this);
if (byteArray.length == 0)
{
COUNT *dest = c->allocate_min<COUNT> ();
if (unlikely (dest == nullptr)) return_trace (false);
*dest = 0;
}
else
{
/* serialize CFFIndex header */
if (unlikely (!c->extend_min (*this))) return_trace (false);
this->count = byteArray.length;
this->offSize = offSize_;
if (!unlikely (c->allocate_size<HBUINT8> (offSize_ * (byteArray.length + 1))))
return_trace (false);
/* serialize indices */
unsigned int offset = 1;
unsigned int i = 0;
for (; i < byteArray.length; i++)
{
set_offset_at (i, offset);
offset += byteArray[i].get_size ();
}
set_offset_at (i, offset);
/* serialize data */
for (unsigned int i = 0; i < byteArray.length; i++)
{
const byte_str_t &bs = byteArray[i];
unsigned char *dest = c->allocate_size<unsigned char> (bs.length);
if (unlikely (dest == nullptr))
return_trace (false);
memcpy (dest, &bs[0], bs.length);
}
}
return_trace (true);
}
bool serialize (hb_serialize_context_t *c,
unsigned int offSize_,
const str_buff_vec_t &buffArray)
{
byte_str_array_t byteArray;
byteArray.init ();
byteArray.resize (buffArray.length);
for (unsigned int i = 0; i < byteArray.length; i++)
{
byteArray[i] = byte_str_t (buffArray[i].arrayZ (), buffArray[i].length);
}
bool result = this->serialize (c, offSize_, byteArray);
byteArray.fini ();
return result;
}
void set_offset_at (unsigned int index, unsigned int offset)
{
HBUINT8 *p = offsets + offSize * index + offSize;
unsigned int size = offSize;
for (; size; size--)
{
--p;
*p = offset & 0xFF;
offset >>= 8;
}
}
unsigned int offset_at (unsigned int index) const
{
assert (index <= count);
const HBUINT8 *p = offsets + offSize * index;
unsigned int size = offSize;
unsigned int offset = 0;
for (; size; size--)
offset = (offset << 8) + *p++;
return offset;
}
unsigned int length_at (unsigned int index) const
{
if (likely ((offset_at (index + 1) >= offset_at (index)) &&
(offset_at (index + 1) <= offset_at (count))))
return offset_at (index + 1) - offset_at (index);
else
return 0;
}
const unsigned char *data_base () const
{ return (const unsigned char *)this + min_size + offset_array_size (); }
unsigned int data_size () const { return HBINT8::static_size; }
byte_str_t operator [] (unsigned int index) const
{
if (likely (index < count))
return byte_str_t (data_base () + offset_at (index) - 1, length_at (index));
else
return Null(byte_str_t);
}
unsigned int get_size () const
{
if (this != &Null(CFFIndex))
{
if (count > 0)
return min_size + offset_array_size () + (offset_at (count) - 1);
else
return count.static_size; /* empty CFFIndex contains count only */
}
else
return 0;
}
protected:
unsigned int max_offset () const
{
unsigned int max = 0;
for (unsigned int i = 0; i < count + 1u; i++)
{
unsigned int off = offset_at (i);
if (off > max) max = off;
}
return max;
}
public:
COUNT count; /* Number of object data. Note there are (count+1) offsets */
HBUINT8 offSize; /* The byte size of each offset in the offsets array. */
HBUINT8 offsets[VAR]; /* The array of (count + 1) offsets into objects array (1-base). */
/* HBUINT8 data[VAR]; Object data */
public:
DEFINE_SIZE_ARRAY (COUNT::static_size + HBUINT8::static_size, offsets);
};
template <typename COUNT, typename TYPE>
struct CFFIndexOf : CFFIndex<COUNT>
{
const byte_str_t operator [] (unsigned int index) const
{
if (likely (index < CFFIndex<COUNT>::count))
return byte_str_t (CFFIndex<COUNT>::data_base () + CFFIndex<COUNT>::offset_at (index) - 1, CFFIndex<COUNT>::length_at (index));
return Null(byte_str_t);
}
template <typename DATA, typename PARAM1, typename PARAM2>
bool serialize (hb_serialize_context_t *c,
unsigned int offSize_,
const DATA *dataArray,
unsigned int dataArrayLen,
const hb_vector_t<unsigned int> &dataSizeArray,
const PARAM1 &param1,
const PARAM2 &param2)
{
TRACE_SERIALIZE (this);
/* serialize CFFIndex header */
if (unlikely (!c->extend_min (*this))) return_trace (false);
this->count = dataArrayLen;
this->offSize = offSize_;
if (!unlikely (c->allocate_size<HBUINT8> (offSize_ * (dataArrayLen + 1))))
return_trace (false);
/* serialize indices */
unsigned int offset = 1;
unsigned int i = 0;
for (; i < dataArrayLen; i++)
{
CFFIndex<COUNT>::set_offset_at (i, offset);
offset += dataSizeArray[i];
}
CFFIndex<COUNT>::set_offset_at (i, offset);
/* serialize data */
for (unsigned int i = 0; i < dataArrayLen; i++)
{
TYPE *dest = c->start_embed<TYPE> ();
if (unlikely (dest == nullptr ||
!dest->serialize (c, dataArray[i], param1, param2)))
return_trace (false);
}
return_trace (true);
}
/* in parallel to above */
template <typename DATA, typename PARAM>
static unsigned int calculate_serialized_size (unsigned int &offSize_ /* OUT */,
const DATA *dataArray,
unsigned int dataArrayLen,
hb_vector_t<unsigned int> &dataSizeArray, /* OUT */
const PARAM &param)
{
/* determine offset size */
unsigned int totalDataSize = 0;
for (unsigned int i = 0; i < dataArrayLen; i++)
{
unsigned int dataSize = TYPE::calculate_serialized_size (dataArray[i], param);
dataSizeArray[i] = dataSize;
totalDataSize += dataSize;
}
offSize_ = calcOffSize (totalDataSize);
return CFFIndex<COUNT>::calculate_serialized_size (offSize_, dataArrayLen, totalDataSize);
}
};
/* Top Dict, Font Dict, Private Dict */
struct Dict : UnsizedByteStr
{
template <typename DICTVAL, typename OP_SERIALIZER, typename PARAM>
bool serialize (hb_serialize_context_t *c,
const DICTVAL &dictval,
OP_SERIALIZER& opszr,
PARAM& param)
{
TRACE_SERIALIZE (this);
for (unsigned int i = 0; i < dictval.get_count (); i++)
{
if (unlikely (!opszr.serialize (c, dictval[i], param)))
return_trace (false);
}
return_trace (true);
}
/* in parallel to above */
template <typename DICTVAL, typename OP_SERIALIZER, typename PARAM>
static unsigned int calculate_serialized_size (const DICTVAL &dictval,
OP_SERIALIZER& opszr,
PARAM& param)
{
unsigned int size = 0;
for (unsigned int i = 0; i < dictval.get_count (); i++)
size += opszr.calculate_serialized_size (dictval[i], param);
return size;
}
template <typename DICTVAL, typename OP_SERIALIZER>
static unsigned int calculate_serialized_size (const DICTVAL &dictval,
OP_SERIALIZER& opszr)
{
unsigned int size = 0;
for (unsigned int i = 0; i < dictval.get_count (); i++)
size += opszr.calculate_serialized_size (dictval[i]);
return size;
}
template <typename INTTYPE, int minVal, int maxVal>
static bool serialize_int_op (hb_serialize_context_t *c, op_code_t op, int value, op_code_t intOp)
{
// XXX: not sure why but LLVM fails to compile the following 'unlikely' macro invocation
if (/*unlikely*/ (!serialize_int<INTTYPE, minVal, maxVal> (c, intOp, value)))
return false;
TRACE_SERIALIZE (this);
/* serialize the opcode */
HBUINT8 *p = c->allocate_size<HBUINT8> (OpCode_Size (op));
if (unlikely (p == nullptr)) return_trace (false);
if (Is_OpCode_ESC (op))
{
*p = OpCode_escape;
op = Unmake_OpCode_ESC (op);
p++;
}
*p = op;
return_trace (true);
}
static bool serialize_uint4_op (hb_serialize_context_t *c, op_code_t op, int value)
{ return serialize_int_op<HBUINT32, 0, 0x7FFFFFFF> (c, op, value, OpCode_longintdict); }
static bool serialize_uint2_op (hb_serialize_context_t *c, op_code_t op, int value)
{ return serialize_int_op<HBUINT16, 0, 0x7FFF> (c, op, value, OpCode_shortint); }
static bool serialize_offset4_op (hb_serialize_context_t *c, op_code_t op, int value)
{
return serialize_uint4_op (c, op, value);
}
static bool serialize_offset2_op (hb_serialize_context_t *c, op_code_t op, int value)
{
return serialize_uint2_op (c, op, value);
}
};
struct TopDict : Dict {};
struct FontDict : Dict {};
struct PrivateDict : Dict {};
struct table_info_t
{
void init () { offSize = offset = size = 0; }
unsigned int offset;
unsigned int size;
unsigned int offSize;
};
/* used to remap font index or SID from fullset to subset.
* set to CFF_UNDEF_CODE if excluded from subset */
struct remap_t : hb_vector_t<hb_codepoint_t>
{
void init () { SUPER::init (); }
void fini () { SUPER::fini (); }
bool reset (unsigned int size)
{
if (unlikely (!SUPER::resize (size)))
return false;
for (unsigned int i = 0; i < length; i++)
(*this)[i] = CFF_UNDEF_CODE;
count = 0;
return true;
}
bool identity (unsigned int size)
{
if (unlikely (!SUPER::resize (size)))
return false;
unsigned int i;
for (i = 0; i < length; i++)
(*this)[i] = i;
count = i;
return true;
}
bool excludes (hb_codepoint_t id) const
{ return (id < length) && ((*this)[id] == CFF_UNDEF_CODE); }
bool includes (hb_codepoint_t id) const
{ return !excludes (id); }
unsigned int add (unsigned int i)
{
if ((*this)[i] == CFF_UNDEF_CODE)
(*this)[i] = count++;
return (*this)[i];
}
hb_codepoint_t get_count () const { return count; }
protected:
hb_codepoint_t count;
private:
typedef hb_vector_t<hb_codepoint_t> SUPER;
};
template <typename COUNT>
struct FDArray : CFFIndexOf<COUNT, FontDict>
{
/* used by CFF1 */
template <typename DICTVAL, typename OP_SERIALIZER>
bool serialize (hb_serialize_context_t *c,
unsigned int offSize_,
const hb_vector_t<DICTVAL> &fontDicts,
OP_SERIALIZER& opszr)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (*this))) return_trace (false);
this->count = fontDicts.length;
this->offSize = offSize_;
if (!unlikely (c->allocate_size<HBUINT8> (offSize_ * (fontDicts.length + 1))))
return_trace (false);
/* serialize font dict offsets */
unsigned int offset = 1;
unsigned int fid = 0;
for (; fid < fontDicts.length; fid++)
{
CFFIndexOf<COUNT, FontDict>::set_offset_at (fid, offset);
offset += FontDict::calculate_serialized_size (fontDicts[fid], opszr);
}
CFFIndexOf<COUNT, FontDict>::set_offset_at (fid, offset);
/* serialize font dicts */
for (unsigned int i = 0; i < fontDicts.length; i++)
{
FontDict *dict = c->start_embed<FontDict> ();
if (unlikely (!dict->serialize (c, fontDicts[i], opszr, fontDicts[i])))
return_trace (false);
}
return_trace (true);
}
/* used by CFF2 */
template <typename DICTVAL, typename OP_SERIALIZER>
bool serialize (hb_serialize_context_t *c,
unsigned int offSize_,
const hb_vector_t<DICTVAL> &fontDicts,
unsigned int fdCount,
const remap_t &fdmap,
OP_SERIALIZER& opszr,
const hb_vector_t<table_info_t> &privateInfos)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (*this))) return_trace (false);
this->count = fdCount;
this->offSize = offSize_;
if (!unlikely (c->allocate_size<HBUINT8> (offSize_ * (fdCount + 1))))
return_trace (false);
/* serialize font dict offsets */
unsigned int offset = 1;
unsigned int fid = 0;
for (unsigned i = 0; i < fontDicts.length; i++)
if (fdmap.includes (i))
{
if (unlikely (fid >= fdCount)) return_trace (false);
CFFIndexOf<COUNT, FontDict>::set_offset_at (fid++, offset);
offset += FontDict::calculate_serialized_size (fontDicts[i], opszr);
}
CFFIndexOf<COUNT, FontDict>::set_offset_at (fid, offset);
/* serialize font dicts */
for (unsigned int i = 0; i < fontDicts.length; i++)
if (fdmap.includes (i))
{
FontDict *dict = c->start_embed<FontDict> ();
if (unlikely (!dict->serialize (c, fontDicts[i], opszr, privateInfos[fdmap[i]])))
return_trace (false);
}
return_trace (true);
}
/* in parallel to above */
template <typename OP_SERIALIZER, typename DICTVAL>
static unsigned int calculate_serialized_size (unsigned int &offSize_ /* OUT */,
const hb_vector_t<DICTVAL> &fontDicts,
unsigned int fdCount,
const remap_t &fdmap,
OP_SERIALIZER& opszr)
{
unsigned int dictsSize = 0;
for (unsigned int i = 0; i < fontDicts.len; i++)
if (fdmap.includes (i))
dictsSize += FontDict::calculate_serialized_size (fontDicts[i], opszr);
offSize_ = calcOffSize (dictsSize);
return CFFIndex<COUNT>::calculate_serialized_size (offSize_, fdCount, dictsSize);
}
};
/* FDSelect */
struct FDSelect0 {
bool sanitize (hb_sanitize_context_t *c, unsigned int fdcount) const
{
TRACE_SANITIZE (this);
if (unlikely (!(c->check_struct (this))))
return_trace (false);
for (unsigned int i = 0; i < c->get_num_glyphs (); i++)
if (unlikely (!fds[i].sanitize (c)))
return_trace (false);
return_trace (true);
}
hb_codepoint_t get_fd (hb_codepoint_t glyph) const
{
return (hb_codepoint_t)fds[glyph];
}
unsigned int get_size (unsigned int num_glyphs) const
{ return HBUINT8::static_size * num_glyphs; }
HBUINT8 fds[VAR];
DEFINE_SIZE_MIN (1);
};
template <typename GID_TYPE, typename FD_TYPE>
struct FDSelect3_4_Range {
bool sanitize (hb_sanitize_context_t *c, const void * /*nullptr*/, unsigned int fdcount) const
{
TRACE_SANITIZE (this);
return_trace (first < c->get_num_glyphs () && (fd < fdcount));
}
GID_TYPE first;
FD_TYPE fd;
DEFINE_SIZE_STATIC (GID_TYPE::static_size + FD_TYPE::static_size);
};
template <typename GID_TYPE, typename FD_TYPE>
struct FDSelect3_4 {
unsigned int get_size () const
{ return GID_TYPE::static_size * 2 + ranges.get_size (); }
bool sanitize (hb_sanitize_context_t *c, unsigned int fdcount) const
{
TRACE_SANITIZE (this);
if (unlikely (!c->check_struct (this) || !ranges.sanitize (c, nullptr, fdcount) ||
(nRanges () == 0) || ranges[0].first != 0))
return_trace (false);
for (unsigned int i = 1; i < nRanges (); i++)
{
if (unlikely (ranges[i - 1].first >= ranges[i].first))
return_trace (false);
}
if (unlikely (!sentinel().sanitize (c) || (sentinel() != c->get_num_glyphs ())))
return_trace (false);
return_trace (true);
}
hb_codepoint_t get_fd (hb_codepoint_t glyph) const
{
unsigned int i;
for (i = 1; i < nRanges (); i++)
if (glyph < ranges[i].first)
break;
return (hb_codepoint_t)ranges[i - 1].fd;
}
GID_TYPE &nRanges () { return ranges.len; }
GID_TYPE nRanges () const { return ranges.len; }
GID_TYPE &sentinel () { return StructAfter<GID_TYPE> (ranges[nRanges () - 1]); }
const GID_TYPE &sentinel () const { return StructAfter<GID_TYPE> (ranges[nRanges () - 1]); }
ArrayOf<FDSelect3_4_Range<GID_TYPE, FD_TYPE>, GID_TYPE> ranges;
/* GID_TYPE sentinel */
DEFINE_SIZE_ARRAY (GID_TYPE::static_size, ranges);
};
typedef FDSelect3_4<HBUINT16, HBUINT8> FDSelect3;
typedef FDSelect3_4_Range<HBUINT16, HBUINT8> FDSelect3_Range;
struct FDSelect {
bool sanitize (hb_sanitize_context_t *c, unsigned int fdcount) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this) && (format == 0 || format == 3) &&
(format == 0)?
u.format0.sanitize (c, fdcount):
u.format3.sanitize (c, fdcount)));
}
bool serialize (hb_serialize_context_t *c, const FDSelect &src, unsigned int num_glyphs)
{
TRACE_SERIALIZE (this);
unsigned int size = src.get_size (num_glyphs);
FDSelect *dest = c->allocate_size<FDSelect> (size);
if (unlikely (dest == nullptr)) return_trace (false);
memcpy (dest, &src, size);
return_trace (true);
}
unsigned int calculate_serialized_size (unsigned int num_glyphs) const
{ return get_size (num_glyphs); }
unsigned int get_size (unsigned int num_glyphs) const
{
unsigned int size = format.static_size;
if (format == 0)
size += u.format0.get_size (num_glyphs);
else
size += u.format3.get_size ();
return size;
}
hb_codepoint_t get_fd (hb_codepoint_t glyph) const
{
if (this == &Null(FDSelect))
return 0;
if (format == 0)
return u.format0.get_fd (glyph);
else
return u.format3.get_fd (glyph);
}
HBUINT8 format;
union {
FDSelect0 format0;
FDSelect3 format3;
} u;
DEFINE_SIZE_MIN (1);
};
template <typename COUNT>
struct Subrs : CFFIndex<COUNT>
{
typedef COUNT count_type;
typedef CFFIndex<COUNT> SUPER;
};
} /* namespace CFF */
#endif /* HB_OT_CFF_COMMON_HH */