1 files changed, 67 insertions, 0 deletions
diff --git a/src/mongo/util/hex.h b/src/mongo/util/hex.h
new file mode 100644
index 00000000000..8cf30f2d9d3
--- /dev/null
+++ b/src/mongo/util/hex.h
@@ -0,0 +1,67 @@
+// util/hex.h
+
+/*    Copyright 2009 10gen Inc.
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+#pragma once
+
+namespace mongo {
+    //can't use hex namespace because it conflicts with hex iostream function
+    inline int fromHex( char c ) {
+        if ( '0' <= c && c <= '9' )
+            return c - '0';
+        if ( 'a' <= c && c <= 'f' )
+            return c - 'a' + 10;
+        if ( 'A' <= c && c <= 'F' )
+            return c - 'A' + 10;
+        assert( false );
+        return 0xff;
+    }
+    inline char fromHex( const char *c ) {
+        return (char)(( fromHex( c[ 0 ] ) << 4 ) | fromHex( c[ 1 ] ));
+    }
+
+    inline string toHex(const void* inRaw, int len) {
+        static const char hexchars[] = "0123456789ABCDEF";
+
+        StringBuilder out;
+        const char* in = reinterpret_cast<const char*>(inRaw);
+        for (int i=0; i<len; ++i) {
+            char c = in[i];
+            char hi = hexchars[(c & 0xF0) >> 4];
+            char lo = hexchars[(c & 0x0F)];
+
+            out << hi << lo;
+        }
+
+        return out.str();
+    }
+
+    inline string toHexLower(const void* inRaw, int len) {
+        static const char hexchars[] = "0123456789abcdef";
+
+        StringBuilder out;
+        const char* in = reinterpret_cast<const char*>(inRaw);
+        for (int i=0; i<len; ++i) {
+            char c = in[i];
+            char hi = hexchars[(c & 0xF0) >> 4];
+            char lo = hexchars[(c & 0x0F)];
+
+            out << hi << lo;
+        }
+
+        return out.str();
+    }
+}