ui/follow.c

   1 /* follow.c
   2  *
   3  * $Id$
   4  *
   5  * Wireshark - Network traffic analyzer
   6  * By Gerald Combs <gerald@wireshark.org>
   7  * Copyright 1998 Gerald Combs
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version 2
  12  * of the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  22  */
  23
  24 #include "config.h"
  25
  26 #include <string.h>
  27
  28 #include <glib.h>
  29
  30 #include <epan/filesystem.h>
  31 #include <epan/dfilter/dfilter.h>
  32
  33 #include "ui/follow.h"
  34
  35 #ifdef HAVE_LIBZ
  36 char *
  37 sgetline(char *str, int *next)
  38 {
  39     char *end;
  40
  41     end = strstr(str, "\r\n");
  42     if (!end) {
  43         *next = (int)strlen(str);
  44         return NULL;
  45     }
  46     *end = '\0';
  47     *next = (int)(end-str+2);
  48     return str;
  49 }
  50
  51 gboolean
  52 parse_http_header(char *data, size_t len, size_t *content_start)
  53 {
  54     char *tmp, *copy, *line;
  55     size_t pos = 0;
  56     int next_line;
  57     gboolean is_gzipped;
  58
  59     /* XXX handle case where only partial header is passed in here.
  60      * we should pass something back to indicate whether header is complete.
  61      * (if not, is_gzipped is may still be unknown)
  62      */
  63
  64     /*
  65      * In order to parse header, we duplicate data and tokenize lines.
  66      * We aren't interested in actual data, so use g_strndup instead of memcpy
  67      * to (possibly) copy fewer bytes (e.g., if a nul byte exists in data)
  68      * This also ensures that we have a terminated string for futher processing.
  69      */
  70     tmp = copy = g_strndup(data, len);
  71     if (!tmp) {
  72         *content_start = 0;
  73         return FALSE;
  74     }
  75
  76     /* skip HTTP... line*/
  77     /*line = */sgetline(tmp, &next_line);
  78
  79     tmp += next_line;
  80     pos += next_line;
  81
  82     is_gzipped = FALSE;
  83
  84     *content_start = -1;
  85     while ((line = sgetline(tmp, &next_line))) {
  86         char *key, *val, *c;
  87
  88         tmp += next_line;
  89         pos += next_line;
  90
  91         if (strlen(line) == 0) {
  92             /* end of header*/
  93             break;
  94         }
  95
  96         c = strchr(line, ':');
  97         if (!c) break;
  98
  99         key = line;
 100         *c = '\0';
 101         val = c+2;
 102
 103         if (!strcmp(key, "Content-Encoding") && strstr(val, "gzip")) {
 104             is_gzipped = TRUE;
 105         }
 106     }
 107     *content_start = pos;
 108     g_free(copy);
 109     return is_gzipped;
 110 }
 111 #endif
 112
 113
 114 /*
 115  * Editor modelines
 116  *
 117  * Local Variables:
 118  * c-basic-offset: 4
 119  * tab-width: 8
 120  * indent-tabs-mode: nil
 121  * End:
 122  *
 123  * ex: set shiftwidth=4 tabstop=8 expandtab:
 124  * :indentSize=4:tabSize=8:noTabs=true:
 125  */