template based hashsum implementation

1 files changed, 87 insertions, 0 deletions

diff --git a/apt-pkg/contrib/hashsum_template.h b/apt-pkg/contrib/hashsum_template.h
new file mode 100644
index 000000000..7667baf92
--- /dev/null
+++ b/apt-pkg/contrib/hashsum_template.h
@@ -0,0 +1,87 @@
+// -*- mode: cpp; mode: fold -*-
+// Description                                                          /*{{{*/
+// $Id: hashsum_template.h,v 1.3 2001/05/07 05:05:47 jgg Exp $
+/* ######################################################################
+
+   HashSumValueTemplate - Generic Storage for a hash value
+   
+   ##################################################################### */
+                                                                        /*}}}*/
+#ifndef APTPKG_HASHSUM_TEMPLATE_H
+#define APTPKG_HASHSUM_TEMPLATE_H
+
+#include <string>
+#include <cstring>
+#include <algorithm>
+#include <stdint.h>
+
+using std::string;
+using std::min;
+
+template<int N>
+class HashSumValue
+{
+   unsigned char Sum[N/8];
+   
+   public:
+
+   // Accessors
+   bool operator ==(const HashSumValue &rhs) const
+   {
+      return memcmp(Sum,rhs.Sum,sizeof(Sum)) == 0;
+   }; 
+
+   string Value() const
+   {
+      char Conv[16] =
+      { '0','1','2','3','4','5','6','7','8','9','a','b',
+        'c','d','e','f'
+      };
+      char Result[((N/8)*2)+1];
+      Result[(N/8)*2] = 0;
+      
+      // Convert each char into two letters
+      int J = 0;
+      int I = 0;
+      for (; I != (N/8)*2; J++,I += 2)
+      {
+         Result[I] = Conv[Sum[J] >> 4];
+         Result[I + 1] = Conv[Sum[J] & 0xF];
+      }
+      return string(Result);
+   };
+   
+   inline void Value(unsigned char S[N/8])
+   {
+      for (int I = 0; I != sizeof(Sum); I++) 
+         S[I] = Sum[I];
+   };
+
+   inline operator string() const 
+   {
+      return Value();
+   };
+
+   bool Set(string Str) 
+   {
+      return Hex2Num(Str,Sum,sizeof(Sum));
+   };
+
+   inline void Set(unsigned char S[N/8]) 
+   {
+      for (int I = 0; I != sizeof(Sum); I++) 
+         Sum[I] = S[I];
+   };
+
+   HashSumValue(string Str) 
+   {
+         memset(Sum,0,sizeof(Sum));
+         Set(Str);
+   }
+   HashSumValue()
+   {
+      memset(Sum,0,sizeof(Sum));
+   }
+};
+
+#endif