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#include "bitcoin/locktime.h"
#include <assert.h>
/* Alpha uses simple locktimes a-la the tx locktime field; BIP68 uses
* a bitmask */
#define SECONDS_POINT 500000000
#define BIP68_SECONDS_FLAG (1<<22)
#define BIP68_LOCKTIME_MASK (0x0000FFFF)
#define BIP68_SECONDS_SHIFT 9
static bool abs_seconds_to_locktime(u32 seconds, u32 *locktime)
{
*locktime = seconds;
if (*locktime < SECONDS_POINT)
return false;
return true;
}
static bool abs_blocks_to_locktime(u32 blocks, u32 *locktime)
{
*locktime = blocks;
if (*locktime >= SECONDS_POINT)
return false;
return true;
}
static bool abs_is_seconds(u32 locktime)
{
return locktime >= SECONDS_POINT;
}
bool seconds_to_rel_locktime(u32 seconds, struct rel_locktime *rel)
{
#if HAS_BIP68
if ((seconds >> BIP68_SECONDS_SHIFT) > BIP68_LOCKTIME_MASK)
return false;
rel->locktime = BIP68_SECONDS_FLAG | (seconds >> BIP68_SECONDS_SHIFT);
return true;
#else
/* Make abs-style time by adding SECONDS_POINT. */
return abs_seconds_to_locktime(seconds + SECONDS_POINT, &rel->locktime);
#endif
}
bool blocks_to_rel_locktime(u32 blocks, struct rel_locktime *rel)
{
#if HAS_BIP68
if (blocks > BIP68_LOCKTIME_MASK)
return false;
#endif
rel->locktime = blocks;
return true;
}
bool rel_locktime_is_seconds(const struct rel_locktime *rel)
{
#if HAS_BIP68
return rel->locktime & BIP68_SECONDS_FLAG;
#else
return abs_is_seconds(rel->locktime);
#endif
}
u32 rel_locktime_to_seconds(const struct rel_locktime *rel)
{
assert(rel_locktime_is_seconds(rel));
#if HAS_BIP68
return (rel->locktime & BIP68_LOCKTIME_MASK) << BIP68_SECONDS_SHIFT;
#else
return rel->locktime - SECONDS_POINT;
#endif
}
u32 rel_locktime_to_blocks(const struct rel_locktime *rel)
{
assert(!rel_locktime_is_seconds(rel));
#if HAS_BIP68
return rel->locktime & BIP68_LOCKTIME_MASK;
#else
return rel->locktime;
#endif
}
u32 bitcoin_nsequence(const struct rel_locktime *rel)
{
#if HAS_BIP68
/* Can't set disable bit, or other bits except low 16 and bit 22 */
assert(!(rel->locktime & ~(BIP68_SECONDS_FLAG|BIP68_LOCKTIME_MASK)));
return rel->locktime;
#else
/* Alpha uses the original proposal: simply invert the bits. */
return ~rel->locktime;
#endif
}
bool seconds_to_abs_locktime(u32 seconds, struct abs_locktime *abs)
{
return abs_seconds_to_locktime(seconds, &abs->locktime);
}
bool blocks_to_abs_locktime(u32 blocks, struct abs_locktime *abs)
{
return abs_blocks_to_locktime(blocks, &abs->locktime);
}
bool abs_locktime_is_seconds(const struct abs_locktime *abs)
{
return abs_is_seconds(abs->locktime);
}
u32 abs_locktime_to_seconds(const struct abs_locktime *abs)
{
assert(abs_locktime_is_seconds(abs));
return abs->locktime;
}
u32 abs_locktime_to_blocks(const struct abs_locktime *abs)
{
assert(!abs_locktime_is_seconds(abs));
return abs->locktime;
}