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* src/sfnt/ttcmap0.c (tt_cmap4_validate): 

fixed over-restrictive validation test. the charmap validator
          now accepts overlapping ranges in format 4 charmaps.

        * src/sfnt/ttcmap0.c (tt_cmap4_char_index):
          switched to a binary search algorithm. Certain fonts contain
          more than 170 distinct segments !!
This commit is contained in:
David Turner 2002-05-01 08:40:32 +00:00
parent af48e32c17
commit 3c5a3e45c9
1 changed files with 97 additions and 31 deletions
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74
src/sfnt/ttcmap0.c
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@ -638,7 +638,7 @@
offsets = deltas + num_segs * 2;
glyph_ids = offsets + num_segs * 2;
if ( glyph_ids >= table + length )
if ( glyph_ids > table + length )
FT_INVALID_TOO_SHORT;
/* check last segment, its end count must be FFFF */
@ -670,8 +670,15 @@
if ( start > end )
FT_INVALID_DATA;
/* this test should be performed at default validation level */
/* unfortunately, some popular asian fonts present overlapping */
/* ranges in their charmaps.. */
/* */
if ( valid->level >= FT_VALIDATE_TIGHT )
{
if ( n > 0 && start <= last )
FT_INVALID_DATA;
}
if ( offset )
{
@ -718,19 +725,74 @@
if ( char_code < 0x10000UL )
{
FT_Byte* p;
FT_Byte* q;
FT_UInt idx, num_segs2;
FT_Int delta;
FT_UInt n, code = (FT_UInt)char_code;
FT_UInt code = (FT_UInt)char_code;
FT_Byte* p;
p = table + 6;
num_segs2 = TT_PEEK_USHORT( p ) & -2; /* be paranoid! */
#if 1
/* some fonts have more than 170 segments in their charmaps !! */
/* we changed this function to use a more efficient binary */
/* search to boost its performance */
{
FT_UInt min = 0;
FT_UInt max = num_segs2 >> 1;
FT_UInt mid, start, end, offset;
while ( min < max )
{
mid = ( min + max ) >> 1;
p = table + 14 + mid*2;
end = TT_NEXT_USHORT( p );
p += num_segs2;
start = TT_PEEK_USHORT( p);
if ( code < start )
max = mid;
else if ( code > end )
min = mid+1;
else
{
/* we found the segment */
idx = code;
p += num_segs2;
delta = TT_PEEK_SHORT( p );
p += num_segs2;
offset = TT_PEEK_USHORT( p );
if ( offset != 0 )
{
p += offset + 2*( idx - start );
idx = TT_PEEK_USHORT( p );
}
if ( idx != 0 )
result = (FT_UInt)( idx + delta ) & 0xFFFU;
goto Exit;
}
}
}
#else /* 0 - old code */
{
FT_UInt n;
FT_Byte* q;
p = table + 14; /* ends table */
q = table + 16 + num_segs2; /* starts table */
for ( n = 0; n < num_segs2; n += 2 )
{
FT_UInt end = TT_NEXT_USHORT( p );
@ -761,6 +823,10 @@
}
}
}
#endif /* 0 */
}
Exit:
return result;
}