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2e18e5dc6d
Growing by a factor lower than the golden ratio increases the chances of reusing memory freed from earlier allocations. Set growth rate to 1.5 which also reduces internal fragmentation.
59 lines
1.2 KiB
C
59 lines
1.2 KiB
C
#ifndef XML_MEMORY_H_PRIVATE__
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#define XML_MEMORY_H_PRIVATE__
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#include "../../libxml.h"
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#include <limits.h>
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#include <stddef.h>
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#ifndef SIZE_MAX
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#define SIZE_MAX ((size_t) -1)
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#endif
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#define XML_MAX_ITEMS 1000000000 /* 1 billion */
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XML_HIDDEN void
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xmlInitMemoryInternal(void);
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XML_HIDDEN void
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xmlCleanupMemoryInternal(void);
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/**
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* xmlGrowCapacity:
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* @array: pointer to array
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* @capacity: pointer to capacity (in/out)
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* @elemSize: size of an element in bytes
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* @min: elements in initial allocation
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* @max: maximum elements in the array
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*
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* Grow an array by at least one element, checking for overflow.
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*
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* Returns the new array size on success, -1 on failure.
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*/
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static XML_INLINE int
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xmlGrowCapacity(int capacity, size_t elemSize, int min, int max) {
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int extra;
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if (capacity <= 0) {
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#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
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(void) min;
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return(1);
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#else
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return(min);
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#endif
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}
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if ((capacity >= max) ||
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((size_t) capacity > SIZE_MAX / 2 / elemSize))
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return(-1);
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/* Grow by 50% */
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extra = (capacity + 1) / 2;
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if (capacity > max - extra)
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return(max);
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return(capacity + extra);
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}
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#endif /* XML_MEMORY_H_PRIVATE__ */
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