Add file(MD5) command to compute cryptographic hash

Provide a CMake-language binding to the md5sum function previously
available only by "cmake -E md5sum".

1 files changed, 36 insertions, 0 deletions

diff --git a/Source/cmFileCommand.cxx b/Source/cmFileCommand.cxx
index f933666..32454f5 100644
--- a/Source/cmFileCommand.cxx
+++ b/Source/cmFileCommand.cxx
@@ -13,6 +13,7 @@
 #include "cmake.h"
 #include "cmHexFileConverter.h"
 #include "cmFileTimeComparison.h"
+#include "cmCryptoHash.h"
 
 #if defined(CMAKE_BUILD_WITH_CMAKE)
 #include "cm_curl.h"
@@ -22,6 +23,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 
+#include <cmsys/auto_ptr.hxx>
 #include <cmsys/Directory.hxx>
 #include <cmsys/Glob.hxx>
 #include <cmsys/RegularExpression.hxx>
@@ -83,6 +85,10 @@ bool cmFileCommand
     {
     return this->HandleReadCommand(args);
     }
+  else if ( subCommand == "MD5" )
+    {
+    return this->HandleHashCommand(args);
+    }
   else if ( subCommand == "STRINGS" )
     {
     return this->HandleStringsCommand(args);
@@ -339,6 +345,36 @@ bool cmFileCommand::HandleReadCommand(std::vector<std::string> const& args)
 }
 
 //----------------------------------------------------------------------------
+bool cmFileCommand::HandleHashCommand(std::vector<std::string> const& args)
+{
+  if(args.size() != 3)
+    {
+    cmOStringStream e;
+    e << args[0] << " requires a file name and output variable";
+    this->SetError(e.str().c_str());
+    return false;
+    }
+
+  cmsys::auto_ptr<cmCryptoHash> hash;
+  if(args[0] == "MD5")
+    { hash.reset(new cmCryptoHashMD5); }
+  if(hash.get())
+    {
+    std::string out = hash->HashFile(args[1].c_str());
+    if(!out.empty())
+      {
+      this->Makefile->AddDefinition(args[2].c_str(), out.c_str());
+      return true;
+      }
+    cmOStringStream e;
+    e << args[0] << " failed to read file \"" << args[1] << "\": "
+      << cmSystemTools::GetLastSystemError();
+    this->SetError(e.str().c_str());
+    }
+  return false;
+}
+
+//----------------------------------------------------------------------------
 bool cmFileCommand::HandleStringsCommand(std::vector<std::string> const& args)
 {
   if(args.size() < 3)