/**
* Parses the provided data chunk, keeping state to allow streaming parsing, i.e., the
* parsing where only partial information is available at any one time. The method
* htp_urlenp_finalize() must be invoked at the end to finalize parsing.
*
* @param urlenp
* @param data
* @param len
* @return
*/
int htp_urlenp_parse_partial(htp_urlenp_t *urlenp, unsigned char *data, size_t len) {
size_t startpos = 0;
size_t pos = 0;
int c;
if (data == NULL) len = 0;
for (;;) {
// Get the next character, or -1
if (pos < len) c = data[pos];
else c = -1;
switch (urlenp->_state) {
// Process key
case HTP_URLENP_STATE_KEY:
// Look for =, argument separator, or end of input
if ((c == '=') || (c == urlenp->argument_separator) || (c == -1)) {
// Data from startpos to pos
htp_urlenp_add_field_piece(urlenp, data, startpos, pos, c);
if (c != -1) {
// Next state
startpos = pos + 1;
urlenp->_state = HTP_URLENP_STATE_VALUE;
}
}
break;
// Process value
case HTP_URLENP_STATE_VALUE:
// Look for argument separator or end of input
if ((c == urlenp->argument_separator) || (c == -1)) {
// Data from startpos to pos
htp_urlenp_add_field_piece(urlenp, data, startpos, pos, c);
if (c != -1) {
// Next state
startpos = pos + 1;
urlenp->_state = HTP_URLENP_STATE_KEY;
}
}
break;
}
// Have we reached the end of input?
if (c == -1) break;
pos++;
}
return HTP_OK;
}
/**
* Parses the provided data chunk, keeping state to allow streaming parsing, i.e., the
* parsing where only partial information is available at any one time. The method
* htp_urlenp_finalize() must be invoked at the end to finalize parsing.
*
* @param[in] urlenp
* @param[in] _data
* @param[in] len
* @return
*/
htp_status_t htp_urlenp_parse_partial(htp_urlenp_t *urlenp, const void *_data, size_t len) {
unsigned char *data = (unsigned char *) _data;
size_t startpos = 0;
size_t pos = 0;
int c;
if (data == NULL) len = 0;
do {
// Get the next character, or use -1 to indicate end of input.
if (pos < len) c = data[pos];
else c = -1;
switch (urlenp->_state) {
case HTP_URLENP_STATE_KEY:
// Look for =, argument separator, or end of input.
if ((c == '=') || (c == urlenp->argument_separator) || (c == -1)) {
// Data from startpos to pos.
htp_urlenp_add_field_piece(urlenp, data, startpos, pos, c);
// If it's not the end of input, then it must be the end of this field.
if (c != -1) {
// Next state.
startpos = pos + 1;
if (c == urlenp->argument_separator) {
urlenp->_state = HTP_URLENP_STATE_KEY;
} else {
urlenp->_state = HTP_URLENP_STATE_VALUE;
}
}
}
pos++;
break;
case HTP_URLENP_STATE_VALUE:
// Look for argument separator or end of input.
if ((c == urlenp->argument_separator) || (c == -1)) {
// Data from startpos to pos.
htp_urlenp_add_field_piece(urlenp, data, startpos, pos, c);
// If it's not the end of input, then it must be the end of this field.
if (c != -1) {
// Next state.
startpos = pos + 1;
urlenp->_state = HTP_URLENP_STATE_KEY;
}
}
pos++;
break;
default:
// Invalid state.
return HTP_ERROR;
}
} while (c != -1);
return HTP_OK;
}
