/**
* Encode URI field
*
* @v field URI field index
* @v raw Raw data
* @v raw_len Length of raw data
* @v buf Buffer
* @v len Length of buffer
* @ret len Length of encoded string (excluding NUL)
*/
size_t uri_encode ( unsigned int field, const void *raw, size_t raw_len,
char *buf, ssize_t len ) {
const uint8_t *raw_bytes = ( ( const uint8_t * ) raw );
ssize_t remaining = len;
size_t used;
char c;
/* Ensure encoded string is NUL-terminated even if empty */
if ( len > 0 )
buf[0] = '\0';
/* Copy string, escaping as necessary */
while ( raw_len-- ) {
c = *(raw_bytes++);
if ( uri_character_escaped ( c, field ) ) {
used = ssnprintf ( buf, remaining, "%%%02X", c );
} else {
used = ssnprintf ( buf, remaining, "%c", c );
}
buf += used;
remaining -= used;
}
return ( len - remaining );
}
/**
* Encode URI field
*
* @v uri URI
* @v field URI field index
* @v buf Buffer to contain encoded string
* @v len Length of buffer
* @ret len Length of encoded string (excluding NUL)
*/
size_t uri_encode ( const char *string, unsigned int field,
char *buf, ssize_t len ) {
ssize_t remaining = len;
size_t used;
char c;
/* Ensure encoded string is NUL-terminated even if empty */
if ( len > 0 )
buf[0] = '\0';
/* Copy string, escaping as necessary */
while ( ( c = *(string++) ) ) {
if ( uri_character_escaped ( c, field ) ) {
used = ssnprintf ( buf, remaining, "%%%02X", c );
} else {
used = ssnprintf ( buf, remaining, "%c", c );
}
buf += used;
remaining -= used;
}
return ( len - remaining );
}