Add a function to MD5 a file's contents.

In doing so, clean up the MD5 interface a little.  Most
existing users only care about the lower 8 bytes of an MD5,
but for some users that care about the upper and lower,
there wasn't a good interface.  Furthermore, consumers
of the MD5 checksum were required to handle endianness
details on their own, so it seems reasonable to abstract
this into a nicer interface that just gives you the right
value.

Differential Revision: https://reviews.llvm.org/D31105

llvm-svn: 298322

1 files changed, 1 insertions, 3 deletions

diff --git a/lldb/source/Host/common/FileSystem.cpp b/lldb/source/Host/common/FileSystem.cpp
index 88f29b46f36..55092dc8400 100644
--- a/lldb/source/Host/common/FileSystem.cpp
+++ b/lldb/source/Host/common/FileSystem.cpp
@@ -67,9 +67,7 @@ bool FileSystem::CalculateMD5(const FileSpec &file_spec, uint64_t offset,
   if (!CalcMD5(file_spec, offset, length, md5_result))
     return false;
 
-  const auto uint64_res = reinterpret_cast<const uint64_t *>(md5_result);
-  high = uint64_res[0];
-  low = uint64_res[1];
+  std::tie(high, low) = md5_result.words();
 
   return true;
 }