1 files changed, 100 insertions, 4 deletions

diff --git a/library/backend/vobject.cpp b/library/backend/vobject.cpp
index 9c2ba3b..e6f6b78 100644
--- a/library/backend/vobject.cpp
+++ b/library/backend/vobject.cpp
@@ -1005,19 +1005,94 @@ static int writeBase64(OFile *fp, unsigned char *s, long len)
     return 1;

 }

 

+static const char *replaceChar(unsigned char c) 
+{
+    if (c == '\n') {
+        return "=0A=\n";
+    } else if (
+            (c >= 'A' && c <= 'Z') 
+            ||
+            (c >= 'a' && c <= 'z') 
+            ||
+            (c >= '0' && c <= '9') 
+            ||
+            (c >= '\'' && c <= ')') 
+            ||
+            (c >= '+' && c <= '-') 
+            ||
+            (c == '/')
+            ||
+            (c == '?') 
+            ||
+            (c == ' ')) 
+    { 
+        return 0;
+    }
+
+    static char trans[4];
+    trans[0] = '=';
+    trans[3] = '\0';
+    int rem = c % 16;
+    int div = c / 16;
+
+    if (div < 10)
+        trans[1] = '0' + div;
+    else
+        trans[1] = 'A' + (div - 10);
+
+    if (rem < 10)
+        trans[2] = '0' + rem;
+    else
+        trans[2] = 'A' + (rem - 10);
+
+    return trans;
+}
+
 static void writeQPString(OFile *fp, const char *s)

 {

+    /*
+        only A-Z, 0-9 and 
+       "'"  (ASCII code 39)
+       "("  (ASCII code 40)
+       ")"  (ASCII code 41)
+       "+"  (ASCII code 43)
+       ","  (ASCII code 44)
+       "-"  (ASCII code 45)
+       "/"  (ASCII code 47)
+       "?"  (ASCII code 63)
+       
+       should remain un-encoded.
+       '=' needs to be encoded as it is the escape character.
+       ';' needs to be as it is a field separator.
+
+     */
     const char *p = s;

     while (*p) {

-        if (*p == '\n') {

-            if (p[1]) appendsOFile(fp,"=0A=");

-            }

+        const char *rep = replaceChar(*p);
+        if (rep)
+            appendsOFile(fp, rep);
+        else
         appendcOFile(fp,*p);

         p++;

         }

 }

 

-

+static bool includesUnprintable(VObject *o)
+{
+    if (o) {
+        if (VALUE_TYPE(o) == VCVT_STRINGZ) {
+            const char *p = STRINGZ_VALUE_OF(o);
+            if (p) {
+                while (*p) {
+                    if (replaceChar(*p))
+                        return TRUE;
+                    p++;
+                }
+            }
+        }
+    }
+    return FALSE;
+}
 

 static void writeVObject_(OFile *fp, VObject *o);

 

@@ -1059,6 +1134,10 @@ static void writeAttrValue(OFile *fp, VObject *o)
         struct PreDefProp *pi;

         pi = lookupPropInfo(NAME_OF(o));

         if (pi && ((pi->flags & PD_INTERNAL) != 0)) return;

+        if ( includesUnprintable(o) ) {
+            appendsOFile(fp, ";" VCEncodingProp "=" VCQuotedPrintableProp);
+            appendsOFile(fp, ";" VCCharSetProp "=" "UTF-8");
+        }
         appendcOFile(fp,';');

         appendsOFile(fp,NAME_OF(o));

         }

@@ -1122,6 +1201,18 @@ static void writeProp(OFile *fp, VObject *o)
             int i = 0, n = 0;

             const char** fields = fields_;

             /* output prop as fields */

+            bool printable = TRUE;
+            while (*fields && printable) {
+                VObject *t = isAPropertyOf(o,*fields);
+                if (includesUnprintable(t))
+                    printable = FALSE;
+                fields++;
+            }
+            fields = fields_;
+            if (!printable) {
+                appendsOFile(fp, ";" VCEncodingProp "=" VCQuotedPrintableProp);
+                appendsOFile(fp, ";" VCCharSetProp "=" "UTF-8");
+            }
             appendcOFile(fp,':');

             while (*fields) {

                 VObject *t = isAPropertyOf(o,*fields);

@@ -1138,7 +1229,12 @@ static void writeProp(OFile *fp, VObject *o)
             }

         }

         

+        
     if (VALUE_TYPE(o)) {

+            if ( includesUnprintable(o) ) {
+            appendsOFile(fp, ";" VCEncodingProp "=" VCQuotedPrintableProp);
+            appendsOFile(fp, ";" VCCharSetProp "=" "UTF-8");
+        }
         unsigned long size = 0;

         VObject *p = isAPropertyOf(o,VCDataSizeProp);

         if (p) size = LONG_VALUE_OF(p);