1 files changed, 90 insertions, 0 deletions
diff --git a/Source/cmCryptoHash.cxx b/Source/cmCryptoHash.cxx
new file mode 100644
index 0000000..3a73398
--- /dev/null
+++ b/Source/cmCryptoHash.cxx
@@ -0,0 +1,90 @@
+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#include "cmCryptoHash.h"
+
+#include <cmsys/MD5.h>
+
+//----------------------------------------------------------------------------
+std::string cmCryptoHash::HashString(const char* input)
+{
+  this->Initialize();
+  this->Append(reinterpret_cast<unsigned char const*>(input),
+               static_cast<int>(strlen(input)));
+  return this->Finalize();
+}
+
+//----------------------------------------------------------------------------
+std::string cmCryptoHash::HashFile(const char* file)
+{
+  std::ifstream fin(file, std::ios::in | cmsys_ios_binary);
+  if(!fin)
+    {
+    return "";
+    }
+
+  this->Initialize();
+
+  // Should be efficient enough on most system:
+  const int bufferSize = 4096;
+  char buffer[bufferSize];
+  unsigned char const* buffer_uc =
+    reinterpret_cast<unsigned char const*>(buffer);
+  // This copy loop is very sensitive on certain platforms with
+  // slightly broken stream libraries (like HPUX).  Normally, it is
+  // incorrect to not check the error condition on the fin.read()
+  // before using the data, but the fin.gcount() will be zero if an
+  // error occurred.  Therefore, the loop should be safe everywhere.
+  while(fin)
+    {
+    fin.read(buffer, bufferSize);
+    if(int gcount = static_cast<int>(fin.gcount()))
+      {
+      this->Append(buffer_uc, gcount);
+      }
+    }
+  if(fin.eof())
+    {
+    return this->Finalize();
+    }
+  return "";
+}
+
+//----------------------------------------------------------------------------
+cmCryptoHashMD5::cmCryptoHashMD5(): MD5(cmsysMD5_New())
+{
+}
+
+//----------------------------------------------------------------------------
+cmCryptoHashMD5::~cmCryptoHashMD5()
+{
+  cmsysMD5_Delete(this->MD5);
+}
+
+//----------------------------------------------------------------------------
+void cmCryptoHashMD5::Initialize()
+{
+  cmsysMD5_Initialize(this->MD5);
+}
+
+//----------------------------------------------------------------------------
+void cmCryptoHashMD5::Append(unsigned char const* buf, int sz)
+{
+  cmsysMD5_Append(this->MD5, buf, sz);
+}
+
+//----------------------------------------------------------------------------
+std::string cmCryptoHashMD5::Finalize()
+{
+  char md5out[32];
+  cmsysMD5_FinalizeHex(this->MD5, md5out);
+  return std::string(md5out, 32);
+}