* This function uses putchar_func to write characters to an OpenPGP
* packet stream from a linked list of packets.
*/
-int write_openpgp_stream(int (*putchar_func)(void *ctx, unsigned char c),
+int write_openpgp_stream(int (*putchar_func)(void *ctx, size_t count,
+ unsigned char *c),
void *ctx,
struct openpgp_packet_list *packets);