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spa: fix integer overflows etc. in spa_pod_compare_value

Browse source 
Add macro SPA_CMP to do 3-way comparisons safely, and use it to avoid
signed integer overflows.

Fix also float/double comparisons (previously 0.1 == 0.8 since cast to
return type int).

Fix Id/Bool comparisons so they can return negative value.
This commit is contained in:
Pauli Virtanen 2024-05-18 15:46:32 +03:00 • committed by Wim Taymans
parent b94d6e53a1
commit a63aa6329b
3 changed files with 28 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

24
spa/include/spa/pod/compare.h
View file

@ -31,16 +31,17 @@ static inline int spa_pod_compare_value(uint32_t type, const void *r1, const voi
case SPA_TYPE_None:
return 0;
case SPA_TYPE_Bool:
return SPA_CMP(!!*(int32_t *)r1, !!*(int32_t *)r2);
case SPA_TYPE_Id:
return *(uint32_t *) r1 == *(uint32_t *) r2 ? 0 : 1;
return SPA_CMP(*(uint32_t *)r1, *(uint32_t *)r2);
case SPA_TYPE_Int:
return *(int32_t *) r1 - *(int32_t *) r2;
return SPA_CMP(*(int32_t *)r1, *(int32_t *)r2);
case SPA_TYPE_Long:
return *(int64_t *) r1 - *(int64_t *) r2;
return SPA_CMP(*(int64_t *)r1, *(int64_t *)r2);
case SPA_TYPE_Float:
return *(float *) r1 - *(float *) r2;
return SPA_CMP(*(float *)r1, *(float *)r2);
case SPA_TYPE_Double:
return *(double *) r1 - *(double *) r2;
return SPA_CMP(*(double *)r1, *(double *)r2);
case SPA_TYPE_String:
return strcmp((char *)r1, (char *)r2);
case SPA_TYPE_Bytes:
@ -60,15 +61,10 @@ static inline int spa_pod_compare_value(uint32_t type, const void *r1, const voi
{
const struct spa_fraction *f1 = (struct spa_fraction *) r1,
*f2 = (struct spa_fraction *) r2;
int64_t n1, n2;
n1 = ((int64_t) f1->num) * f2->denom;
n2 = ((int64_t) f2->num) * f1->denom;
if (n1 < n2)
return -1;
else if (n1 > n2)
return 1;
else
return 0;
uint64_t n1, n2;
n1 = ((uint64_t) f1->num) * f2->denom;
n2 = ((uint64_t) f2->num) * f1->denom;
return SPA_CMP(n1, n2);
}
default:
break;

10
spa/include/spa/utils/defs.h
View file

@ -186,6 +186,16 @@ struct spa_fraction {
x; \
})
/** 3-way comparison. NaN > NaN and NaN > finite numbers */
#define SPA_CMP(a, b) \
({ \
__typeof__(a) _a = (a); \
__typeof__(b) _b = (b); \
(_a > _b) ? 1 : (_a == _b) ? 0 : (_a < _b) ? -1 \
: (_a == _a) ? -1 : (_b == _b) ? 1 \
: 1; \
})
/**
* Return the address (buffer + offset) as pointer of \a type
*/