--- hplip-2.7.6/scan/sane/pml.c.14charsign	2007-07-22 00:21:18.000000000 +0800
+++ hplip-2.7.6/scan/sane/pml.c	2007-07-22 00:26:22.000000000 +0800
@@ -228,7 +228,7 @@
                            int maxlen )
 {
     int type, len;
-    unsigned char prefix[2];
+    char prefix[2];
 
     if( PmlGetPrefixValue( obj, &type, 0, 0, 0, 0 ) == ERROR )
     {
@@ -242,7 +242,8 @@
     }
     if( pSymbolSet )
     {
-        *pSymbolSet = ( ( prefix[0] << 8 ) | prefix[1] );
+        *pSymbolSet = ( ( (unsigned char)prefix[0] << 8 ) | 
+                          (unsigned char)prefix[1] );
     }
 
     return len;
@@ -251,7 +252,7 @@
 int __attribute__ ((visibility ("hidden"))) PmlGetIntegerValue( PmlObject_t obj, int * pType, int * pValue )
 {
     int type;
-    unsigned char svalue[sizeof( int )];
+    char svalue[sizeof( int )];
     int accum = 0, i, len;
 
     if( !pType )
@@ -267,7 +268,7 @@
 
     for( i = 0; i < len; i++ )
     {
-        accum = ( ( accum << 8 ) | ( svalue[i] & 0xFF ) );
+        accum = ( ( accum << 8 ) | ( (unsigned char)svalue[i] ) );
     }
     if( pValue )
     {
@@ -348,7 +349,7 @@
 
 int __attribute__ ((visibility ("hidden"))) PmlRequestGet( int deviceid, int channelid, PmlObject_t obj ) 
 {
-    unsigned char data[PML_MAX_DATALEN];
+    char data[PML_MAX_DATALEN];
     int datalen=0, stat=ERROR, type, pml_result;
     enum HPMUD_RESULT result;
 
@@ -358,7 +359,7 @@
 
     if (result == HPMUD_R_OK)
     {
-       PmlSetValue(obj, type, (char *)data, datalen);
+       PmlSetValue(obj, type, data, datalen);
        stat = OK;
     }
 
--- hplip-2.7.6/scan/sane/scl.c.14charsign	2007-07-22 00:26:32.000000000 +0800
+++ hplip-2.7.6/scan/sane/scl.c	2007-07-22 00:28:07.000000000 +0800
@@ -36,10 +36,11 @@
 #define DEBUG_DECLARE_ONLY
 #include "sanei_debug.h"
 
-static int SclBufferIsPartialReply( unsigned char * data, int datalen )
+static int SclBufferIsPartialReply( void * dataptr, int datalen )
 {
     int i = 0, value = 0;
-    unsigned char d;  
+    unsigned char * const data = dataptr;
+    unsigned int d;  
 
     if( i >= datalen )
     {
--- hplip-2.7.6/ip/xpnm.c.14charsign	2007-07-22 00:28:28.000000000 +0800
+++ hplip-2.7.6/ip/xpnm.c	2007-07-22 00:28:46.000000000 +0800
@@ -422,7 +422,7 @@
         *pdwInputNextPos  = g->dwInNextPos;
         *pdwOutputThisPos = g->dwOutNextPos;
         if (g->fIsEncode && !g->fDidHeader) {
-            BYTE buffer[MAX_ENCODE_HEADER_SIZE];
+            char buffer[MAX_ENCODE_HEADER_SIZE];
             DWORD maxval=(2<<((g->traits.iBitsPerPixel/
                 g->traits.iComponentsPerPixel)-1))-1;
             int len;