summaryrefslogtreecommitdiffstats
path: root/third_party/aom/aom_mem/aom_mem.c
diff options
context:
space:
mode:
Diffstat (limited to 'third_party/aom/aom_mem/aom_mem.c')
-rw-r--r--third_party/aom/aom_mem/aom_mem.c84
1 files changed, 84 insertions, 0 deletions
diff --git a/third_party/aom/aom_mem/aom_mem.c b/third_party/aom/aom_mem/aom_mem.c
new file mode 100644
index 0000000000..e603fc5bfb
--- /dev/null
+++ b/third_party/aom/aom_mem/aom_mem.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#include "aom_mem.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "include/aom_mem_intrnl.h"
+#include "aom/aom_integer.h"
+
+#if defined(AOM_MAX_ALLOCABLE_MEMORY)
+// Returns 0 in case of overflow of nmemb * size.
+static int check_size_argument_overflow(uint64_t nmemb, uint64_t size) {
+ const uint64_t total_size = nmemb * size;
+ if (nmemb == 0) return 1;
+ if (size > AOM_MAX_ALLOCABLE_MEMORY / nmemb) return 0;
+ if (total_size != (size_t)total_size) return 0;
+ return 1;
+}
+#endif
+
+static size_t GetAlignedMallocSize(size_t size, size_t align) {
+ return size + align - 1 + ADDRESS_STORAGE_SIZE;
+}
+
+static size_t *GetMallocAddressLocation(void *const mem) {
+ return ((size_t *)mem) - 1;
+}
+
+static void SetActualMallocAddress(void *const mem,
+ const void *const malloc_addr) {
+ size_t *const malloc_addr_location = GetMallocAddressLocation(mem);
+ *malloc_addr_location = (size_t)malloc_addr;
+}
+
+static void *GetActualMallocAddress(void *const mem) {
+ const size_t *const malloc_addr_location = GetMallocAddressLocation(mem);
+ return (void *)(*malloc_addr_location);
+}
+
+void *aom_memalign(size_t align, size_t size) {
+ void *x = NULL;
+ const size_t aligned_size = GetAlignedMallocSize(size, align);
+#if defined(AOM_MAX_ALLOCABLE_MEMORY)
+ if (!check_size_argument_overflow(1, aligned_size)) return NULL;
+#endif
+ void *const addr = malloc(aligned_size);
+ if (addr) {
+ x = align_addr((unsigned char *)addr + ADDRESS_STORAGE_SIZE, align);
+ SetActualMallocAddress(x, addr);
+ }
+ return x;
+}
+
+void *aom_malloc(size_t size) { return aom_memalign(DEFAULT_ALIGNMENT, size); }
+
+void *aom_calloc(size_t num, size_t size) {
+ const size_t total_size = num * size;
+ void *const x = aom_malloc(total_size);
+ if (x) memset(x, 0, total_size);
+ return x;
+}
+
+void aom_free(void *memblk) {
+ if (memblk) {
+ void *addr = GetActualMallocAddress(memblk);
+ free(addr);
+ }
+}
+
+void *aom_memset16(void *dest, int val, size_t length) {
+ size_t i;
+ uint16_t *dest16 = (uint16_t *)dest;
+ for (i = 0; i < length; i++) *dest16++ = val;
+ return dest;
+}