1 files changed, 86 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vpx_mem/vpx_mem.c b/media/libvpx/libvpx/vpx_mem/vpx_mem.c
new file mode 100644
index 0000000000..18abf1158b
--- /dev/null
+++ b/media/libvpx/libvpx/vpx_mem/vpx_mem.c
@@ -0,0 +1,86 @@
+/*
+ *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "vpx_mem.h"
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "include/vpx_mem_intrnl.h"
+#include "vpx/vpx_integer.h"
+
+#if !defined(VPX_MAX_ALLOCABLE_MEMORY)
+#if SIZE_MAX > (1ULL << 40)
+#define VPX_MAX_ALLOCABLE_MEMORY (1ULL << 40)
+#else
+// For 32-bit targets keep this below INT_MAX to avoid valgrind warnings.
+#define VPX_MAX_ALLOCABLE_MEMORY ((1ULL << 31) - (1 << 16))
+#endif
+#endif
+
+// 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 > VPX_MAX_ALLOCABLE_MEMORY / nmemb) return 0;
+  if (total_size != (size_t)total_size) return 0;
+
+  return 1;
+}
+
+static size_t *get_malloc_address_location(void *const mem) {
+  return ((size_t *)mem) - 1;
+}
+
+static uint64_t get_aligned_malloc_size(size_t size, size_t align) {
+  return (uint64_t)size + align - 1 + ADDRESS_STORAGE_SIZE;
+}
+
+static void set_actual_malloc_address(void *const mem,
+                                      const void *const malloc_addr) {
+  size_t *const malloc_addr_location = get_malloc_address_location(mem);
+  *malloc_addr_location = (size_t)malloc_addr;
+}
+
+static void *get_actual_malloc_address(void *const mem) {
+  size_t *const malloc_addr_location = get_malloc_address_location(mem);
+  return (void *)(*malloc_addr_location);
+}
+
+void *vpx_memalign(size_t align, size_t size) {
+  void *x = NULL, *addr;
+  const uint64_t aligned_size = get_aligned_malloc_size(size, align);
+  if (!check_size_argument_overflow(1, aligned_size)) return NULL;
+
+  addr = malloc((size_t)aligned_size);
+  if (addr) {
+    x = align_addr((unsigned char *)addr + ADDRESS_STORAGE_SIZE, align);
+    set_actual_malloc_address(x, addr);
+  }
+  return x;
+}
+
+void *vpx_malloc(size_t size) { return vpx_memalign(DEFAULT_ALIGNMENT, size); }
+
+void *vpx_calloc(size_t num, size_t size) {
+  void *x;
+  if (!check_size_argument_overflow(num, size)) return NULL;
+
+  x = vpx_malloc(num * size);
+  if (x) memset(x, 0, num * size);
+  return x;
+}
+
+void vpx_free(void *memblk) {
+  if (memblk) {
+    void *addr = get_actual_malloc_address(memblk);
+    free(addr);
+  }
+}