Index: components/variations/metrics_util.cc |
diff --git a/components/variations/metrics_util.cc b/components/variations/metrics_util.cc |
index 031c3d37a31311794a33aef7bc09497a0e0fa5f3..aeb62d47d319ab3e96c3e4a50789d8719a75b757 100644 |
--- a/components/variations/metrics_util.cc |
+++ b/components/variations/metrics_util.cc |
@@ -4,11 +4,25 @@ |
#include "components/variations/metrics_util.h" |
+#include "base/logging.h" |
+#include "base/md5.h" |
#include "base/sha1.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 |
+ |
uint32 HashName(const std::string& name) { |
// SHA-1 is designed to produce a uniformly random spread in its output space, |
// even for nearly-identical inputs. |
@@ -24,4 +38,20 @@ uint32 HashName(const std::string& name) { |
return base::ByteSwapToLE32(bits); |
} |
+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)); |
+ uint64 hash = HashToUInt64(hash_str); |
Alexei Svitkine (slow)
2014/02/05 18:07:01
Nit: Just return this directly.
Steven Holte
2014/02/05 22:44:37
Done.
|
+ |
+ return hash; |
+} |
+ |
} // namespace metrics |