libwebp: update snapshot to v0.2.0-rc1

third_party/libwebp/utils/utils.c

+// Copyright 2012 Google Inc. All Rights Reserved.
+//
+// This code is licensed under the same terms as WebM:
+//  Software License Agreement:  http://www.webmproject.org/license/software/
+//  Additional IP Rights Grant:  http://www.webmproject.org/license/additional/
+// -----------------------------------------------------------------------------
+//
+// Misc. common utility functions
+//
+// Author: Skal (pascal.massimino@gmail.com)
+
+#include <stdlib.h>
+#include "./utils.h"
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+//------------------------------------------------------------------------------
+// Checked memory allocation
+
+static int CheckSizeArguments(uint64_t nmemb, size_t size) {
+  const uint64_t total_size = nmemb * size;
+  if (nmemb == 0) return 1;
+  if ((uint64_t)size > WEBP_MAX_ALLOCABLE_MEMORY / nmemb) return 0;
+  if (total_size != (size_t)total_size) return 0;
+  return 1;
+}
+
+void* WebPSafeMalloc(uint64_t nmemb, size_t size) {
+  if (!CheckSizeArguments(nmemb, size)) return NULL;
+  return malloc((size_t)(nmemb * size));
+}
+
+void* WebPSafeCalloc(uint64_t nmemb, size_t size) {
+  if (!CheckSizeArguments(nmemb, size)) return NULL;
+  return calloc((size_t)nmemb, size);
+}
+
+//------------------------------------------------------------------------------
+
+#if defined(__cplusplus) || defined(c_plusplus)
+}    // extern "C"
+#endif