http_parse patch

Hi,

i have attached a small patch for checking content length converting overflow.
polipo now responds with a 

502 Couldn't parse server headers

when objects exceed 2GB+ 

Thomas

hunk ./http_parse.c 901
                 do_log(L_WARN, ".\n");
                 len = -1;
             } else {
+		errno = 0;
                 len = strtol(buf + value_start, &endptr, 10);
hunk ./http_parse.c 903
+		if(errno == ERANGE) {
+                    do_log(L_ERROR, "Content-Length overflow: \n");
+                    do_log_n(L_ERROR, buf + value_start, [_$_]
+                             value_end - value_start);
+                    do_log(L_ERROR, ".\n");
+                    goto fail;
+                }
                 if(endptr <= buf + value_start) {
                     do_log(L_WARN, "Couldn't parse Content-Length: \n");
                     do_log_n(L_WARN, buf + value_start, [_$_]



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