LGTM.com - false positive Multiplication result may overflow 'int' before it is converted to 'size_t'.
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false-positive
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It doesn't seem to understand bounds checking before conversion, or that the value returns with the thrown exception I guess:
https://lgtm.com/projects/g/sandsmark/genieutils/snapshot/83dc9ec17bc36ac8f77bbbf82fae9ffbbd6ceeca/files/src/resource/SmxFrame.cpp?sort=name&dir=ASC&mode=heatmap#L145
y is checked right before, m_normalHeader.width is checked before the loop (line 116).
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