/* zutil_p.h -- Private inline functions used internally in zlib-ng

* For conditions of distribution and use, see copyright notice in zlib.h

*/

#ifndef ZUTIL_P_H

#define ZUTIL_P_H

#if defined(__APPLE__) || defined(HAVE_POSIX_MEMALIGN) || defined(HAVE_ALIGNED_ALLOC)

# include <stdlib.h>

#elif defined(__FreeBSD__)

# include <stdlib.h>

# include <malloc_np.h>

#else

# include <malloc.h>

#endif

/* Function to allocate 16 or 64-byte aligned memory */

static inline void *zng_alloc(size_t size) {

#ifdef HAVE_ALIGNED_ALLOC

/* Size must be a multiple of alignment */

size = (size + (64 - 1)) & ~(64 - 1);

return (void *)aligned_alloc(64, size); /* Defined in C11 */

#elif defined(HAVE_POSIX_MEMALIGN)

void *ptr;

return posix_memalign(&ptr, 64, size) ? NULL : ptr;

#elif defined(_WIN32)

return (void *)_aligned_malloc(size, 64);

#elif defined(__APPLE__)

/* Fallback for when posix_memalign and aligned_alloc are not available.

* On macOS, it always aligns to 16 bytes. */

return (void *)malloc(size);

#else

return (void *)memalign(64, size);

#endif

}

/* Function that can free aligned memory */

static inline void zng_free(void *ptr) {

#if defined(_WIN32)

_aligned_free(ptr);

#else

free(ptr);

#endif

}

/* Use memcpy instead of memcmp to avoid older compilers not converting memcmp calls to

unaligned comparisons when unaligned access is supported. */

static inline int32_t zng_memcmp_2(const void *src0, const void *src1) {

uint16_t src0_cmp, src1_cmp;

memcpy(&src0_cmp, src0, sizeof(src0_cmp));

memcpy(&src1_cmp, src1, sizeof(src1_cmp));

return src0_cmp != src1_cmp;

}

static inline int32_t zng_memcmp_4(const void *src0, const void *src1) {

uint32_t src0_cmp, src1_cmp;

memcpy(&src0_cmp, src0, sizeof(src0_cmp));

memcpy(&src1_cmp, src1, sizeof(src1_cmp));

return src0_cmp != src1_cmp;

}

static inline int32_t zng_memcmp_8(const void *src0, const void *src1) {

uint64_t src0_cmp, src1_cmp;

memcpy(&src0_cmp, src0, sizeof(src0_cmp));

memcpy(&src1_cmp, src1, sizeof(src1_cmp));

return src0_cmp != src1_cmp;

}

#endif