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Add some comments explaining what some code is doing. 

Change-Id: Ib229fcf4d14fd3c01755f868789f430496c23ded
Reviewed-on: https://code.wireshark.org/review/12300
Reviewed-by: Guy Harris <guy@alum.mit.edu>
This commit is contained in:
Guy Harris 2015-11-29 20:59:26 -08:00
parent 943be4b755
commit 51ed8f4e52
1 changed files with 26 additions and 1 deletions
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27
wiretap/ascendtext.c
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@ -98,13 +98,28 @@ static gint64 ascend_seek(wtap *wth, int *err, gchar **err_info)
return -1;
}
/*
* See whether this is the string_level[string_i]th character of
* Ascend magic string string_i.
*/
for (string_i = 0; string_i < ASCEND_MAGIC_STRINGS; string_i++) {
const gchar *strptr = ascend_magic[string_i].strptr;
size_t len = strlen(strptr);
if (byte == *(strptr + string_level[string_i])) {
/*
* Yes, it is, so we need to check for the next character of
* that string.
*/
string_level[string_i]++;
/*
* Have we matched the entire string?
*/
if (string_level[string_i] >= len) {
/*
* Yes.
*/
cur_off = file_tell(wth->fh);
if (cur_off == -1) {
/* Error. */
@ -115,11 +130,21 @@ static gint64 ascend_seek(wtap *wth, int *err, gchar **err_info)
/* Date: header is a special case. Remember the offset,
but keep looking for other headers. */
if (strcmp(strptr, ASCEND_DATE) == 0) {
/* We matched a Date: header.
Reset the amount of Date: header that we've matched,
so that we start the process of matching a Date:
header all over again.
XXX - what if we match multiple Date: headers before
matching some other header? */
date_off = cur_off - len;
string_level[string_i] = 0;
} else {
/* We matched some other type of header. */
if (date_off == -1) {
/* Back up over the header we just read; that's where a read
/* We haven't yet seen a date header, so this packet
doesn't have one.
Back up over the header we just read; that's where a read
of this packet should start. */
packet_off = cur_off - len;
} else {