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#ifndef LIGHTNING_COMMON_FEATURES_H
#define LIGHTNING_COMMON_FEATURES_H
#include "config.h"
#include <ccan/short_types/short_types.h>
#include <ccan/tal/tal.h>
/* Returns -1 if we're OK with all these offered features, otherwise first
* unsupported (even) feature. */
int features_unsupported(const u8 *features);
/* For sending our features: tal_count() returns length. */
u8 *get_offered_initfeatures(const tal_t *ctx);
u8 *get_offered_globalinitfeatures(const tal_t *ctx);
u8 *get_offered_nodefeatures(const tal_t *ctx);
u8 *get_offered_bolt11features(const tal_t *ctx);
/* Is this feature bit requested? (Either compulsory or optional) */
bool feature_offered(const u8 *features, size_t f);
/* Was this feature bit offered by them and us? */
bool feature_negotiated(const u8 *lfeatures, size_t f);
/* Return a list of what features we advertize. */
const char **list_supported_features(const tal_t *ctx);
/* Low-level helpers to deal with big-endian bitfields. */
bool feature_is_set(const u8 *features, size_t bit);
void set_feature_bit(u8 **ptr, u32 bit);
/* BOLT #9:
*
* Flags are numbered from the least-significant bit, at bit 0 (i.e. 0x1,
* an _even_ bit). They are generally assigned in pairs so that features
* can be introduced as optional (_odd_ bits) and later upgraded to be compulsory
* (_even_ bits), which will be refused by outdated nodes:
* see [BOLT #1: The `init` Message](01-messaging.md#the-init-message).
*/
#define COMPULSORY_FEATURE(x) ((x) & 0xFFFFFFFE)
#define OPTIONAL_FEATURE(x) ((x) | 1)
/* BOLT #9:
*
* ## Assigned `localfeatures` flags
*...
* | Bits | Name |...
* | 0/1 | `option_data_loss_protect` |...
* | 3 | `initial_routing_sync` |...
* | 4/5 | `option_upfront_shutdown_script` |...
* | 6/7 | `gossip_queries` |...
* | 10/11 | `gossip_queries_ex` |...
* | 12/13| `option_static_remotekey` |...
*/
#define OPT_DATA_LOSS_PROTECT 0
#define OPT_INITIAL_ROUTING_SYNC 2
#define OPT_UPFRONT_SHUTDOWN_SCRIPT 4
#define OPT_GOSSIP_QUERIES 6
#define OPT_GOSSIP_QUERIES_EX 10
#define OPT_STATIC_REMOTEKEY 12
/* BOLT-3a09bc54f8443c4757b47541a5310aff6377ee21 #9:
*
* | 14/15 | `payment_secret` |... IN9 ...
* | 16/17 | `basic_mpp` |... IN9 ...
*/
#define OPT_PAYMENT_SECRET 14
#define OPT_BASIC_MPP 16
/* BOLT #9:
*
* ## Assigned `globalfeatures` flags
*...
* | Bits | Name | ...
* | 8/9 | `var_onion_optin` | ...
*/
#define OPT_VAR_ONION 8
#endif /* LIGHTNING_COMMON_FEATURES_H */