implement _mime_decode_message(), but with a lot of code duplication. Not optimal.

src/pEpEngine_mime.cc

@@ -6,6 +6,7 @@
 #define _EXPORT_PEP_ENGINE_DLL
 #include <pEp/message.h>
 #include "pEpMIME.hh"
+#include "pEpMIME_internal.hh"
 
 // function interface for pEp engine
 // link this to use pEp MIME with C code
@@ -43,6 +44,40 @@ extern "C"
     }
 
 
+    DYNAMIC_API PEP_STATUS _mime_decode_message(
+            const char *mimetext,
+            size_t size,
+            message **msg,
+            bool* raise_msg_attachment
+        )
+    {
+        assert(msg);
+        assert(mimetext);
+
+        if (!(msg && mimetext))
+            return PEP_ILLEGAL_VALUE;
+
+        PEP_STATUS status = PEP_STATUS_OK;
+        *msg = nullptr;
+
+        try{
+            message* m = pEpMIME::parse_message(mimetext, size);
+            if(m)
+            {
+               *msg = m;
+               stringpair_list_t* forwarded = stringpair_list_find(m->opt_fields, pEpMIME::Pseudo_Header_Forwarded.data());
+               *raise_msg_attachment = (forwarded && forwarded->value && forwarded->value->value==std::string{"no"});
+            }else{
+               status = PEP_OUT_OF_MEMORY;
+            }
+        }catch(...)
+        {
+            status = PEP_UNKNOWN_ERROR;
+        }
+        return status;
+    }
+
+
     PEP_STATUS _mime_encode_message_internal(
             const message * msg,
             bool omit_fields,