use large positve values for illegal DVB-SI string encodings

interpret encoding fields as UINT32 so that the displayed value matches
the actual bytes in the packet

svn path=/trunk/; revision=53927

3 files changed, 12 insertions, 11 deletions

diff --git a/epan/charsets.h b/epan/charsets.h
index a4bc4ced40..71caa967b9 100644
--- a/epan/charsets.h
+++ b/epan/charsets.h
@@ -34,10 +34,6 @@ extern "C" {
 #endif /* __cplusplus */
 
 typedef enum {
-   DVB_ENCODING_INVALID   = -3, /* length invalid */
-   DVB_ENCODING_RESERVED  = -2, /* reserved by spec */
-
-   DVB_ENCODING_UNKNOWN   = -1,  /* not defined by spec */
 
    DVB_ENCODING_LATIN = 0,
    DVB_ENCODING_ISO_8859_5,
@@ -70,6 +66,10 @@ typedef enum {
    DVB_ENCODING_EXT_ISO_8859_13 = DVB_ENCODING_EXT_BASE | 13,
    DVB_ENCODING_EXT_ISO_8859_14 = DVB_ENCODING_EXT_BASE | 14,
    DVB_ENCODING_EXT_ISO_8859_15 = DVB_ENCODING_EXT_BASE | 15,
+
+   DVB_ENCODING_INVALID   = G_MAXUINT32-3, /* length invalid */
+   DVB_ENCODING_RESERVED  = G_MAXUINT32-2, /* reserved by spec */
+   DVB_ENCODING_UNKNOWN   = G_MAXUINT32-1, /* not defined by spec */
 } dvb_encoding_e;
 
 extern const value_string dvb_string_encoding_vals[];
diff --git a/epan/dissectors/packet-dvbci.c b/epan/dissectors/packet-dvbci.c
index 92a1c085f9..43e7a72993 100644
--- a/epan/dissectors/packet-dvbci.c
+++ b/epan/dissectors/packet-dvbci.c
@@ -2223,7 +2223,8 @@ dissect_si_string(tvbuff_t *tvb, gint offset, gint str_len,
         return;
 
     enc_len = dvb_analyze_string_charset(tvb, offset, str_len, &encoding);
-    proto_tree_add_int(tree, hf_dvbci_mmi_char_tbl, tvb, offset, enc_len, encoding);
+    proto_tree_add_uint(tree, hf_dvbci_mmi_char_tbl,
+            tvb, offset, enc_len, encoding);
 
     offset += enc_len;
     str_len -= enc_len;
@@ -2898,7 +2899,7 @@ dissect_dvbci_payload_mmi(guint32 tag, gint len_field,
                             &ei_dvbci_invalid_char_tbl, tvb, offset, msg_len);
                         break;
                     }
-                    proto_tree_add_int(tree, hf_dvbci_mmi_char_tbl,
+                    proto_tree_add_uint(tree, hf_dvbci_mmi_char_tbl,
                             tvb, offset, enc_len, encoding);
                     offset += enc_len;
                  }
@@ -3719,7 +3720,7 @@ dissect_dvbci_payload_opp(guint32 tag, gint len_field _U_,
                       tvb_reported_length_remaining(tvb, offset));
               break;
           }
-          proto_tree_add_int(tree, hf_dvbci_opp_char_tbl,
+          proto_tree_add_uint(tree, hf_dvbci_opp_char_tbl,
                   tvb, offset, enc_len, encoding);
           offset += enc_len;
 
@@ -5282,7 +5283,7 @@ proto_register_dvbci(void)
         },
         { &hf_dvbci_mmi_char_tbl,
           { "Character table", "dvb-ci.mmi.char_tbl",
-            FT_INT32, BASE_DEC, VALS(dvb_string_encoding_vals), 0, NULL, HFILL}
+            FT_UINT32, BASE_HEX, VALS(dvb_string_encoding_vals), 0, NULL, HFILL}
         },
         { &hf_dvbci_blind_ans,
           { "Blind answer flag", "dvb-ci.mmi.blind_ans",
@@ -5653,7 +5654,7 @@ proto_register_dvbci(void)
         },
         { &hf_dvbci_opp_char_tbl,
           { "Character table", "dvb-ci.opp.char_tbl",
-            FT_INT32, BASE_DEC, VALS(dvb_string_encoding_vals), 0, NULL, HFILL}
+            FT_UINT32, BASE_HEX, VALS(dvb_string_encoding_vals), 0, NULL, HFILL}
         },
         { &hf_dvbci_sdt_rst_trusted,
           { "SDT running status trusted", "dvb-ci.opp.sdt_rst_trusted",
diff --git a/epan/dissectors/packet-mpeg-descriptor.c b/epan/dissectors/packet-mpeg-descriptor.c
index dd79c99918..b808e39405 100644
--- a/epan/dissectors/packet-mpeg-descriptor.c
+++ b/epan/dissectors/packet-mpeg-descriptor.c
@@ -1212,7 +1212,7 @@ proto_mpeg_descriptor_dissect_short_event(tvbuff_t *tvb, guint offset, proto_tre
 
     if (name_len>0) {
         enc_len = dvb_analyze_string_charset(tvb, offset, name_len, &encoding);
-        proto_tree_add_int(tree, hf_mpeg_descr_short_event_name_encoding, tvb, offset, enc_len, encoding);
+        proto_tree_add_uint(tree, hf_mpeg_descr_short_event_name_encoding, tvb, offset, enc_len, encoding);
         proto_tree_add_item(tree, hf_mpeg_descr_short_event_name,
                 tvb, offset+enc_len, name_len-enc_len, dvb_enc_to_item_enc(encoding));
     }
@@ -3515,7 +3515,7 @@ proto_register_mpeg_descriptor(void)
 
         { &hf_mpeg_descr_short_event_name_encoding, {
             "Event Name Encoding", "mpeg_descr.short_evt.name_enc",
-            FT_INT32, BASE_DEC, VALS(dvb_string_encoding_vals), 0, NULL, HFILL
+            FT_UINT32, BASE_HEX, VALS(dvb_string_encoding_vals), 0, NULL, HFILL
         } },
 
         { &hf_mpeg_descr_short_event_name, {