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features: fix endian.

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Closes: https://github.com/lightningnetwork/lightning-rfc/issues/424

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2018-05-15 14:47:20 +09:30 committed by Christian Decker
parent 8659745ca6
commit 149e967ba3
1 changed files with 20 additions and 8 deletions
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28
common/features.c
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@ -10,11 +10,28 @@ static const u32 local_features[] = {
static const u32 global_features[] = {
};
/* BOLT #1:
*
* All data fields are unsigned big-endian unless otherwise specified.
*/
static void set_bit(u8 **ptr, u32 bit)
{
if (bit / 8 >= tal_len(*ptr))
tal_resizez(ptr, (bit / 8) + 1);
(*ptr)[bit / 8] |= (1 << (bit % 8));
size_t len = tal_len(*ptr);
if (bit / 8 >= len) {
size_t newlen = (bit / 8) + 1;
u8 *newarr = tal_arrz(tal_parent(*ptr), u8, newlen);
memcpy(newarr + (newlen - len), *ptr, len);
tal_free(*ptr);
*ptr = newarr;
len = newlen;
}
(*ptr)[len - 1 - bit / 8] |= (1 << (bit % 8));
}
static bool test_bit(const u8 *features, size_t byte, unsigned int bit)
{
assert(byte < tal_len(features));
return features[tal_len(features) - 1 - byte] & (1 << (bit % 8));
}
/* We don't insist on anything, it's all optional. */
@ -37,11 +54,6 @@ u8 *get_offered_local_features(const tal_t *ctx)
return mkfeatures(ctx, local_features, ARRAY_SIZE(local_features));
}
static bool test_bit(const u8 *features, size_t byte, unsigned int bit)
{
return features[byte] & (1 << (bit % 8));
}
static bool feature_set(const u8 *features, size_t bit)
{
size_t bytenum = bit / 8;