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* src/cff/cffload.c (cff_charser_load): modified charset loader to 

accept pre-defined charsets, even when the font contains fewer glyphs.
        also enforced more checks to ensure that we never overflow the
        character codes array in the encoding.
This commit is contained in:
David Turner 2002-11-23 16:41:23 +00:00
parent c2278680e7
commit 9967dce2b2
2 changed files with 30 additions and 7 deletions
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4
ChangeLog
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@ -1,7 +1,9 @@
2002-11-23 David Turner <david@freetype.org> 2002-11-23 David Turner <david@freetype.org>
* src/cff/cffload.c (cff_charser_load): modified charset loader to * src/cff/cffload.c (cff_charser_load): modified charset loader to
accept pre-defined charsets, even when the font contains fewer glyphs accept pre-defined charsets, even when the font contains fewer glyphs.
also enforced more checks to ensure that we never overflow the
character codes array in the encoding.
2002-11-18 David Turner <david@freetype.org> 2002-11-18 David Turner <david@freetype.org>

31
src/cff/cffload.c
View File

@ -1743,14 +1743,17 @@
FT_READ_BYTE( count ) ) FT_READ_BYTE( count ) )
goto Exit; goto Exit;
encoding->count = count + 1;
switch ( encoding->format & 0x7F ) switch ( encoding->format & 0x7F )
{ {
case 0: case 0:
{ {
FT_Byte* p; FT_Byte* p;
/* by convention, GID 0 is always ".notdef" and is never */
/* coded in the font. Hence, the number of codes found */
/* in the table is 'count+1' */
/* */
encoding->count = count + 1;
if ( FT_FRAME_ENTER( count ) ) if ( FT_FRAME_ENTER( count ) )
goto Exit; goto Exit;
@ -1762,7 +1765,7 @@
glyph_code = *p++; glyph_code = *p++;
/* Make sure j is not too big. */ /* Make sure j is not too big. */
if ( (FT_UInt) glyph_code < num_glyphs ) if ( j < num_glyphs )
{ {
/* Assign code to GID mapping. */ /* Assign code to GID mapping. */
encoding->codes[glyph_code] = (FT_UShort)j; encoding->codes[glyph_code] = (FT_UShort)j;
@ -1783,6 +1786,8 @@
FT_UInt k; FT_UInt k;
encoding->count = 0;
/* Parse the Format1 ranges. */ /* Parse the Format1 ranges. */
for ( j = 0; j < count; j++, i += nleft ) for ( j = 0; j < count; j++, i += nleft )
{ {
@ -1797,6 +1802,10 @@
/* Increment nleft, so we read `nleft + 1' codes/sids. */ /* Increment nleft, so we read `nleft + 1' codes/sids. */
nleft++; nleft++;
/* compute max number of character codes */
if ( nleft > encoding->count )
encoding->count = nleft;
/* Fill in the range of codes/sids. */ /* Fill in the range of codes/sids. */
for ( k = i; k < nleft + i; k++, glyph_code++ ) for ( k = i; k < nleft + i; k++, glyph_code++ )
{ {
@ -1811,6 +1820,10 @@
} }
} }
} }
/* simple check, one never knows what can be found in a font */
if ( encoding->count > 256 )
encoding->count = 256;
} }
break; break;
@ -1866,8 +1879,6 @@
/* encoding (see the note at the end of section 12 in the CFF */ /* encoding (see the note at the end of section 12 in the CFF */
/* specification). */ /* specification). */
encoding->count = 256;
switch ( (FT_UInt)offset ) switch ( (FT_UInt)offset )
{ {
case 0: case 0:
@ -1885,6 +1896,10 @@
Populate: Populate:
/* Construct code to GID mapping from code to SID mapping */ /* Construct code to GID mapping from code to SID mapping */
/* and charset. */ /* and charset. */
encoding->count = 0;
for ( j = 0; j < 256; j++ ) for ( j = 0; j < 256; j++ )
{ {
/* If j is encoded, find the GID for it. */ /* If j is encoded, find the GID for it. */
@ -1904,7 +1919,13 @@
encoding->sids [j] = 0; encoding->sids [j] = 0;
} }
else else
{
encoding->codes[j] = (FT_UShort)i; encoding->codes[j] = (FT_UShort)i;
/* update encoding count */
if ( encoding->count < j+1 )
encoding->count = j+1;
}
} }
} }
break; break;