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#include "features.h"
#include <wire/peer_wire.h>
static const u8 supported_local_features[]
= {LOCALFEATURES_INITIAL_ROUTING_SYNC};
static const u8 supported_global_features[]
= {};
u8 *get_supported_global_features(const tal_t *ctx)
{
return tal_dup_arr(ctx, u8, supported_global_features,
sizeof(supported_global_features), 0);
}
u8 *get_supported_local_features(const tal_t *ctx)
{
return tal_dup_arr(ctx, u8, supported_local_features,
sizeof(supported_local_features), 0);
}
/**
* requires_unsupported_features - Check if we support what's being asked
*
* Given the features vector that the remote connection is expecting
* from us, we check to see if we support all even bit features, i.e.,
* the required features. We do so by subtracting our own features in
* the provided positions and see if even bits remain.
*
* @bitmap: the features bitmap the peer is asking for
* @supportmap: what do we support
* @smlen: how long is our supportmap
*/
static bool requires_unsupported_features(const u8 *bitmap,
const u8 *supportmap,
size_t smlen)
{
size_t len = tal_count(bitmap);
u8 support;
for (size_t i=0; i<len; i++) {
/* Find matching bitmap byte in supportmap, 0x00 if none */
if (len > smlen) {
support = 0x00;
} else {
support = supportmap[smlen-1];
}
/* Cancel out supported bits, check for even bits */
if ((~support & bitmap[i]) & 0x55)
return true;
}
return false;
}
bool unsupported_features(const u8 *gfeatures, const u8 *lfeatures)
{
return requires_unsupported_features(gfeatures,
supported_global_features,
sizeof(supported_global_features))
|| requires_unsupported_features(lfeatures,
supported_local_features,
sizeof(supported_local_features));
}