This function sometimes takes negative values for example when contourCount
is -1 (0xFFFF) which is UB "For negative a, the behavior of a << b is
undefined.". Possible output from sanitizer:
podofo/doc/PdfFontTTFSubset.cpp:73:18: runtime error: left shift of
negative value -1
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
podofo/doc/PdfFontTTFSubset.cpp:73:18 in
inline short Big2Little(short big)
{
return ((big << 8) & 0xFF00) | ((big >> 8) & 0x00FF);
}
Called from here:
GetData( ctx.ulGlyfTableOffset + ctx.glyphData.glyphAddress,
&ctx.contourCount, __LENGTH_WORD);
ctx.contourCount = Big2Little(ctx.contourCount);
if (ctx.contourCount < 0) {
/* skeep over numberOfContours, xMin, yMin, xMax and yMax */
LoadCompound(ctx, ctx.glyphData.glyphAddress + 5 *
__LENGTH_WORD);
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