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Use hb_parse_double in CFF::dict_opset_t::parse_bcd

This commit is contained in:
Ebrahim Byagowi 2019-09-04 01:22:21 +04:30
parent 57f88e11d4
commit 1083df8b80
2 changed files with 32 additions and 108 deletions
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2
src/Makefile.sources
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@ -243,6 +243,8 @@ HB_ICU_headers = hb-icu.h
# Sources for libharfbuzz-subset
HB_SUBSET_sources = \
hb-number.cc \
hb-number.hh \
hb-ot-cff1-table.cc \
hb-ot-cff2-table.cc \
hb-static.cc \

138
src/hb-cff-interp-dict-common.hh
View File

@ -94,130 +94,52 @@ struct dict_opset_t : opset_t<number_t>
}
}
/* Turns CFF's BCD format into strtod understandable string */
static double parse_bcd (byte_str_ref_t& str_ref)
{
bool neg = false;
double int_part = 0;
uint64_t frac_part = 0;
uint32_t frac_count = 0;
bool exp_neg = false;
uint32_t exp_part = 0;
bool exp_overflow = false;
enum Part { INT_PART=0, FRAC_PART, EXP_PART } part = INT_PART;
enum Nibble { DECIMAL=10, EXP_POS, EXP_NEG, RESERVED, NEG, END };
const uint64_t MAX_FRACT = 0xFFFFFFFFFFFFFull; /* 1^52-1 */
const uint32_t MAX_EXP = 0x7FFu; /* 1^11-1 */
if (unlikely (str_ref.in_error ())) return .0;
double value = 0.0;
enum Nibble { DECIMAL=10, EXP_POS, EXP_NEG, RESERVED, NEG, END };
char buf[32];
unsigned char byte = 0;
for (uint32_t i = 0;; i++)
for (unsigned i = 0, count = 0; count < ARRAY_LENGTH (buf); ++i, ++count)
{
char d;
if ((i & 1) == 0)
unsigned nibble;
if (!(i & 1))
{
if (!str_ref.avail ())
{
str_ref.set_error ();
return 0.0;
}
if (unlikely (!str_ref.avail ())) break;
byte = str_ref[0];
str_ref.inc ();
d = byte >> 4;
nibble = byte >> 4;
}
else
d = byte & 0x0F;
nibble = byte & 0x0F;
switch (d)
if (unlikely (nibble == RESERVED)) break;
else if (nibble == END)
{
case RESERVED:
str_ref.set_error ();
return value;
case END:
value = (double) (neg ? -int_part : int_part);
if (frac_count > 0)
{
double frac = frac_part / pow (10.0, (double) frac_count);
if (neg) frac = -frac;
value += frac;
}
if (unlikely (exp_overflow))
{
if (value == 0.0)
return value;
if (exp_neg)
return neg ? -DBL_MIN : DBL_MIN;
else
return neg ? -DBL_MAX : DBL_MAX;
}
if (exp_part != 0)
{
if (exp_neg)
value /= pow (10.0, (double) exp_part);
else
value *= pow (10.0, (double) exp_part);
}
return value;
case NEG:
if (i != 0)
{
str_ref.set_error ();
return 0.0;
}
neg = true;
const char *p = buf;
double pv;
if (unlikely (!hb_parse_double (&p, p + count, &pv, true/* whole buffer */)))
break;
case DECIMAL:
if (part != INT_PART)
{
str_ref.set_error ();
return value;
}
part = FRAC_PART;
break;
case EXP_NEG:
exp_neg = true;
HB_FALLTHROUGH;
case EXP_POS:
if (part == EXP_PART)
{
str_ref.set_error ();
return value;
}
part = EXP_PART;
break;
default:
switch (part) {
default:
case INT_PART:
int_part = (int_part * 10) + d;
break;
case FRAC_PART:
if (likely (frac_part <= MAX_FRACT / 10))
{
frac_part = (frac_part * 10) + (unsigned)d;
frac_count++;
}
break;
case EXP_PART:
if (likely (exp_part * 10 + d <= MAX_EXP))
{
exp_part = (exp_part * 10) + d;
}
else
exp_overflow = true;
break;
}
return pv;
}
else
{
buf[count] = "0123456789.EE?-?"[nibble];
if (nibble == EXP_NEG)
{
++count;
if (unlikely (count == ARRAY_LENGTH (buf))) break;
buf[count] = '-';
}
}
}
return value;
str_ref.set_error ();
return .0;
}
static bool is_hint_op (op_code_t op)