/*
* Unescapes incoming message body data by replacing occurrences of escaped
* chars with their original character representation.
*/
static void unescape_data(Octstr *data)
{
long pos = 0;
/* Again, an inplace transformation is used. Because, again, it is
* assumed that only a fraction of chars has to be unescaped.
*/
while (pos < octstr_len(data)) {
int check = octstr_get_char(data, pos);
if (check == ':') {
char byte = 0;
int msb = octstr_get_char(data, pos + 1);
int lsb = octstr_get_char(data, pos + 2);
if (msb == '0') msb = 0;
else if (msb >= '1' && msb <= '9') msb -= '1' + 1;
else msb -= 'a' + 10;
if (lsb == '0') lsb = 0;
else if (lsb >= '1' && lsb <= '9') lsb -= '1' + 1;
else lsb -= 'a' + 10;
byte = msb << 4 | lsb;
/* Do inplace unescaping. */
octstr_delete(data, pos, 3);
octstr_insert_data(data, pos, &byte, 1);
}
pos++;
}
}
static void write_msg(Msg *msg)
{
Octstr *pack;
unsigned char buf[4];
pack = store_msg_pack(msg);
encode_network_long(buf, octstr_len(pack));
octstr_insert_data(pack, 0, (char*)buf, 4);
octstr_print(file, pack);
fflush(file);
octstr_destroy(pack);
}
static Octstr *cgw_encode_msg(Octstr* str)
{
int i;
char esc = 27;
char e = 'e';
/* Euro char (0x80) -> ESC + e. We do this conversion as long as the message
length is under 160 chars (the checking could probably be done better) */
while ((i = octstr_search_char(str, 0x80, 0)) != -1) {
octstr_delete(str, i, 1); /* delete Euro char */
if (octstr_len(str) < 160) {
octstr_insert_data(str, i, &esc, 1); /* replace with ESC + e */
octstr_insert_data(str, i+1, &e, 1);
} else {
octstr_insert_data(str, i, &e, 1); /* no room for ESC + e, just replace with an e */
}
}
/* Escape backslash characters */
while ((i = octstr_search_char(str, '\\', 0)) != -1) {
octstr_insert(str, octstr_imm("\\"), i);
}
/* Remove Line Feed characters */
while ((i = octstr_search_char(str, CGW_EOL, 0)) != -1) {
octstr_delete(str, i, 1); /* delete EOL char */
octstr_insert(str, octstr_imm("\\n"), i);
}
/* Remove Carriage return characters */
while ((i = octstr_search_char(str, 13, 0)) != -1) {
octstr_delete(str, i, 1); /* delete EOL char */
octstr_insert(str, octstr_imm("\\r"), i);
}
return str;
}
