Index: src/RawConverter.cc
===================================================================
RCS file: /afs/psi.ch/user/z/zimoch/.cvsroot/StreamDevice2/src/RawConverter.cc,v
retrieving revision 1.6
diff -u -r1.6 RawConverter.cc
--- src/RawConverter.cc	10 Jul 2006 11:08:22 -0000	1.6
+++ src/RawConverter.cc	21 Nov 2007 15:37:51 -0000
@@ -54,7 +54,16 @@
             value >>= 8;
             width--;
         }
-        byte = (byte & 0x80) ? 0xFF : 0x00; // fill with sign
+        if (format.flags & zero_flag)
+        {
+            // fill with zero
+            byte = 0;
+        }
+        else
+        {
+            // fill with sign
+            byte = (byte & 0x80) ? 0xFF : 0x00;
+        }
         while (width--)
         {
             output.append(byte);
@@ -62,8 +71,17 @@
     }
     else // msb first (big endian)
     {
-        byte = ((value >> (8 * (prec-1))) & 0x80) ? 0xFF : 0x00;
-        while (width > prec) // fill with sign
+        if (format.flags & zero_flag)
+        {
+            // fill with zero
+            byte = 0;
+        }
+        else
+        {
+            // fill with sign
+            byte = ((value >> (8 * (prec-1))) & 0x80) ? 0xFF : 0x00;
+        }
+        while (width > prec)
         {
             output.append(byte);
             width--;
@@ -98,14 +116,32 @@
         }
         if (width == 0)
         {
-            val |= ((signed char) input[length++]) << shift;
+            if (format.flags & zero_flag)
+            {
+                // fill with zero
+                val |= ((unsigned char) input[length++]) << shift;
+            }
+            else
+            {
+                // fill with sign
+                val |= ((signed char) input[length++]) << shift;
+            }
         }
         length += width; // ignore upper bytes not fitting in long
     }
     else
     {
-        // big endian (sign extended)*/
-        val = (signed char) input[length++];
+        // big endian */
+        if (format.flags & zero_flag)
+        {
+            // fill with zero
+            val = (unsigned char) input[length++];
+        }
+        else
+        {
+            // fill with sign
+            val = (signed char) input[length++];
+        }
         while (--width)
         {
             val <<= 8;
Index: doc/formats.html
===================================================================
RCS file: /afs/psi.ch/user/z/zimoch/.cvsroot/StreamDevice2/doc/formats.html,v
retrieving revision 1.12
diff -u -r1.12 formats.html
--- doc/formats.html	3 Oct 2007 08:18:08 -0000	1.12
+++ doc/formats.html	5 Feb 2008 08:42:50 -0000
@@ -264,23 +264,28 @@
 <h2>9. Raw LONG Converter (<code>%r</code>)</h2>
 <p>
 The raw converter does not really "convert".
-A signed integer value is written or read in the internal
+A signed or unsigned integer value is written or read in the internal
 (usually two's complement) representation of the computer.
 The normal byte order is <em>big endian</em>, i.e. most significant byte
 first.
 With the <code>#</code> flag, the byte order is changed to <em>little
 endian</em>, i.e. least significant byte first.
+With the <code>0</code> flag, the value is unsigned, otherwise signed.
 </p>
 <p>
 In output, the <em>width</em> least significant bytes of the value
 are written.
 If <em>width</em> is larger than the size of a <code>long</code>,
-the value is sign extended.
+the value is sign extended or zero extended, depending on the
+<code>0</code> flag.
 </p>
 <p>
 In input, <em>width</em> bytes are read and put into the value.
-If <em>width</em> is longer than the size of a <code>long</code>, only
+If <em>width</em> is larger than the size of a <code>long</code>, only
 the least significant bytes are used.
+If <em>width</em> is smaller than the size of a <code>long</code>,
+the value is sign extended or zero extended, depending on the
+<code>0</code> flag.
 </p>
 
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