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webp: WEBP_OFFSET_PTR()

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Removes undefined behavior of offsetting NULL.

Change-Id: I7c83d0c913c631c091a5fb128f6d6b46b1d116db
This commit is contained in:
Yannis Guyon
2020-03-20 11:39:06 +01:00
parent 687ab00e6e
commit 47309ef52d
2 changed files with 22 additions and 14 deletions
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6
src/dsp/dsp.h
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@ -193,6 +193,12 @@ extern "C" {
#endif
#endif
// If 'ptr' is NULL, returns NULL. Otherwise returns 'ptr + off'.
// Prevents undefined behavior sanitizer nullptr-with-nonzero-offset warning.
#if !defined(WEBP_OFFSET_PTR)
#define WEBP_OFFSET_PTR(ptr, off) (((ptr) == NULL) ? NULL : ((ptr) + (off)))
#endif
// Regularize the definition of WEBP_SWAP_16BIT_CSP (backward compatibility)
#if !defined(WEBP_SWAP_16BIT_CSP)
#define WEBP_SWAP_16BIT_CSP 0