1 files changed, 52 insertions, 0 deletions
diff --git a/apt-pkg/contrib/hashsum.cc b/apt-pkg/contrib/hashsum.cc
new file mode 100644
index 000000000..25ccc187d
--- /dev/null
+++ b/apt-pkg/contrib/hashsum.cc
@@ -0,0 +1,52 @@
+// Cryptographic API Base
+#include <config.h>
+
+#include <apt-pkg/fileutl.h>
+
+#include <algorithm>
+#include <unistd.h>
+#include "hashsum_template.h"
+
+// Summation::AddFD - Add content of file into the checksum		/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool SummationImplementation::AddFD(int const Fd, unsigned long long Size) {
+   unsigned char Buf[64 * 64];
+   bool const ToEOF = (Size == 0);
+   while (Size != 0 || ToEOF)
+   {
+      unsigned long long n = sizeof(Buf);
+      if (!ToEOF) n = std::min(Size, n);
+      ssize_t const Res = read(Fd, Buf, n);
+      if (Res < 0 || (!ToEOF && Res != (ssize_t) n)) // error, or short read
+	 return false;
+      if (ToEOF && Res == 0) // EOF
+	 break;
+      Size -= Res;
+      Add(Buf,Res);
+   }
+   return true;
+}
+bool SummationImplementation::AddFD(FileFd &Fd, unsigned long long Size) {
+   unsigned char Buf[64 * 64];
+   bool const ToEOF = (Size == 0);
+   while (Size != 0 || ToEOF)
+   {
+      unsigned long long n = sizeof(Buf);
+      if (!ToEOF) n = std::min(Size, n);
+      unsigned long long a = 0;
+      if (Fd.Read(Buf, n, &a) == false) // error
+	 return false;
+      if (ToEOF == false)
+      {
+	 if (a != n) // short read
+	    return false;
+      }
+      else if (a == 0) // EOF
+	 break;
+      Size -= a;
+      Add(Buf, a);
+   }
+   return true;
+}
+									/*}}}*/