Handle snaplen before choplen for consistency. Also, if chopping more bytes

than present, just chop all by setting caplen to 0.  In all cases, don't touch
len.  In other words, change incl_len but leave orig_len alone.

svn path=/trunk/; revision=37488

1 files changed, 13 insertions, 10 deletions

diff --git a/editcap.c b/editcap.c
index fa053529aa..ae9306736e 100644
--- a/editcap.c
+++ b/editcap.c
@@ -1221,23 +1221,26 @@ main(int argc, char *argv[])
 
         phdr = wtap_phdr(wth);
 
-        if (choplen < 0 && (phdr->caplen + choplen) > 0) {
+        if (snaplen != 0 && phdr->caplen > snaplen) {
           snap_phdr = *phdr;
-          snap_phdr.caplen += choplen;
+          snap_phdr.caplen = snaplen;
           phdr = &snap_phdr;
         }
 
-        if (choplen > 0 && phdr->caplen > (unsigned int) choplen) {
+        if (choplen < 0) {
           snap_phdr = *phdr;
-          snap_phdr.caplen -= choplen;
-          snap_phdr.len -= choplen;
-          buf += choplen;
+          if (((signed int) phdr->caplen + choplen) > 0)
+            snap_phdr.caplen += choplen;
+          else
+            snap_phdr.caplen = 0;
           phdr = &snap_phdr;
-        }
-
-        if (snaplen != 0 && phdr->caplen > snaplen) {
+        } else if (choplen > 0) {
           snap_phdr = *phdr;
-          snap_phdr.caplen = snaplen;
+          if (phdr->caplen > (unsigned int) choplen) {
+            snap_phdr.caplen -= choplen;
+            buf += choplen;
+          } else
+            snap_phdr.caplen = 0;
           phdr = &snap_phdr;
         }