Add file(MD5) command to compute cryptographic hash

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

2 files changed, 40 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)
diff --git a/Source/cmFileCommand.h b/Source/cmFileCommand.h
index 162890a..dce6478 100644
--- a/Source/cmFileCommand.h
+++ b/Source/cmFileCommand.h
@@ -65,6 +65,7 @@ public:
       "  file(WRITE filename \"message to write\"... )\n"
       "  file(APPEND filename \"message to write\"... )\n"
       "  file(READ filename variable [LIMIT numBytes] [OFFSET offset] [HEX])\n"
+      "  file(MD5 filename variable)\n"
       "  file(STRINGS filename variable [LIMIT_COUNT num]\n"
       "       [LIMIT_INPUT numBytes] [LIMIT_OUTPUT numBytes]\n"
       "       [LENGTH_MINIMUM numBytes] [LENGTH_MAXIMUM numBytes]\n"
@@ -94,6 +95,8 @@ public:
       "variable. It will start at the given offset and read up to numBytes. "
       "If the argument HEX is given, the binary data will be converted to "
       "hexadecimal representation and this will be stored in the variable.\n"
+      "MD5 "
+      "will compute a cryptographic hash of the content of a file.\n"
       "STRINGS will parse a list of ASCII strings from a file and "
       "store it in a variable. Binary data in the file are ignored. Carriage "
       "return (CR) characters are ignored. It works also for Intel Hex and "
@@ -227,6 +230,7 @@ protected:
   bool HandleRemove(std::vector<std::string> const& args, bool recurse);
   bool HandleWriteCommand(std::vector<std::string> const& args, bool append);
   bool HandleReadCommand(std::vector<std::string> const& args);
+  bool HandleHashCommand(std::vector<std::string> const& args);
   bool HandleStringsCommand(std::vector<std::string> const& args);
   bool HandleGlobCommand(std::vector<std::string> const& args, bool recurse);
   bool HandleMakeDirectoryCommand(std::vector<std::string> const& args);