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freetype2
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Code Issues 9 Releases Wiki Activity

[sfnt] Use faster macros in checksums. 

* src/truetype/ttobjs.c (tt_synth_sfnt_checksum): Use FT_NEXT_XXX.
* src/sfnt/sfwoff2.c (compute_ULong_sum): Use macros.
This commit is contained in:
Alexei Podtelezhnikov 2024-05-01 23:19:31 -04:00
parent 13da904267
commit 4d50468478
2 changed files with 12 additions and 11 deletions
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10
src/sfnt/sfwoff2.c
View File

@ -289,17 +289,15 @@
FT_ULong checksum = 0;
FT_ULong aligned_size = size & ~3UL;
FT_ULong i;
FT_Int shift;
for ( i = 0; i < aligned_size; i += 4 )
checksum += ( (FT_ULong)buf[i ] << 24 ) |
( (FT_ULong)buf[i + 1] << 16 ) |
( (FT_ULong)buf[i + 2] << 8 ) |
( (FT_ULong)buf[i + 3] << 0 );
checksum += FT_NEXT_ULONG( buf );
/* remaining bytes can be shifted and added one at a time */
for ( ; i < size; ++i )
checksum += (FT_ULong)buf[i] << ( 24 - 8 * ( i & 3 ) );
for ( shift = 24; i < size; i++, shift -= 8 )
checksum += (FT_UInt32)FT_NEXT_BYTE( buf ) << shift;
return checksum;
}

13
src/truetype/ttobjs.c
View File

@ -256,17 +256,20 @@
{
FT_Error error;
FT_UInt32 checksum = 0;
FT_UInt i;
FT_Byte* p;
FT_Int shift;
if ( FT_FRAME_ENTER( length ) )
return 0;
for ( ; length > 3; length -= 4 )
checksum += (FT_UInt32)FT_GET_ULONG();
p = (FT_Byte*)stream->cursor;
for ( i = 3; length > 0; length--, i-- )
checksum += (FT_UInt32)FT_GET_BYTE() << ( i * 8 );
for ( ; length > 3; length -= 4 )
checksum += FT_NEXT_ULONG( p );
for ( shift = 24; length > 0; length--, shift -=8 )
checksum += (FT_UInt32)FT_NEXT_BYTE( p ) << shift;
FT_FRAME_EXIT();