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crn_defs: fix false positive “out of range subscript” error #83

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crn_defs: fix false positive “out of range subscript” error #83

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20 changes: 20 additions & 0 deletions inc/crn_defs.h
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Original file line number Diff line number Diff line change
Expand Up @@ -225,6 +225,17 @@ struct crn_packed_uint {
}

inline operator unsigned int() const {
#if 0
/* Compilers will expand the template with all conditions
and generate the code for all conditions even if only one
condition is usable per template variant.

Compilers like ICC will raise warnings at compile time,
and code analysers like CodeQL will raise warnings when
analysing the compiled binary.

See: https://github.com/DaemonEngine/crunch/issues/79 */

switch (N) {
case 1:
return m_buf[0];
Expand All @@ -235,6 +246,15 @@ struct crn_packed_uint {
default:
return (m_buf[0] << 24U) | (m_buf[1] << 16U) | (m_buf[2] << 8U) | (m_buf[3]);
}
#else
unsigned int val = 0U;

for (unsigned int i = 0U; i < N; i++) {
val |= m_buf[ i ] << ((N - (i + 1U)) * 8U);
}

return val;
#endif
}

unsigned char m_buf[N];
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