Index: components/metrics/metrics_hashes.cc |
diff --git a/components/metrics/metrics_hashes.cc b/components/metrics/metrics_hashes.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..901587e885d474941c62b12255fdd993f48fd957 |
--- /dev/null |
+++ b/components/metrics/metrics_hashes.cc |
@@ -0,0 +1,39 @@ |
+// Copyright (c) 2014 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "components/metrics/metrics_hashes.h" |
+ |
+#include "base/logging.h" |
+#include "base/md5.h" |
+#include "base/sys_byteorder.h" |
+ |
+namespace metrics { |
+ |
+namespace { |
+ |
+// Converts the 8-byte prefix of an MD5 hash into a uint64 value. |
+inline uint64 HashToUInt64(const std::string& hash) { |
+ uint64 value; |
+ DCHECK_GE(hash.size(), sizeof(value)); |
+ memcpy(&value, hash.data(), sizeof(value)); |
+ return base::HostToNet64(value); |
+} |
+ |
+} // namespace |
+ |
+uint64 HashMetricName(const std::string& name) { |
+ // Create an MD5 hash of the given |name|, represented as a byte buffer |
+ // encoded as an std::string. |
+ base::MD5Context context; |
+ base::MD5Init(&context); |
+ base::MD5Update(&context, name); |
+ |
+ base::MD5Digest digest; |
+ base::MD5Final(&digest, &context); |
+ |
+ std::string hash_str(reinterpret_cast<char*>(digest.a), arraysize(digest.a)); |
+ return HashToUInt64(hash_str); |
+} |
+ |
+} // namespace metrics |