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4b02c6f558
I got confused navigating these, especially since Alpha and Bitcoin have diverged (BIP68 was proposed after Elements Alpha). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
#include "bitcoin/locktime.h"
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#include <assert.h>
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/* Alpha uses simple locktimes a-la the tx locktime field; BIP68 uses
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* a bitmask */
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#define SECONDS_POINT 500000000
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#define BIP68_SECONDS_FLAG (1<<22)
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#define BIP68_LOCKTIME_MASK (0x0000FFFF)
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#define BIP68_SECONDS_SHIFT 9
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static bool abs_seconds_to_locktime(u32 seconds, u32 *locktime)
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{
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*locktime = seconds;
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if (*locktime < SECONDS_POINT)
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return false;
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return true;
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}
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static bool abs_blocks_to_locktime(u32 blocks, u32 *locktime)
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{
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*locktime = blocks;
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if (*locktime >= SECONDS_POINT)
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return false;
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return true;
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}
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static bool abs_is_seconds(u32 locktime)
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{
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return locktime >= SECONDS_POINT;
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}
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bool seconds_to_rel_locktime(u32 seconds, struct rel_locktime *rel)
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{
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#ifdef HAS_BIP68
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if ((seconds >> BIP68_SECONDS_SHIFT) > BIP68_LOCKTIME_MASK)
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return false;
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rel->locktime = BIP68_SECONDS_FLAG | (seconds >> BIP68_SECONDS_SHIFT);
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return true;
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#else
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/* Make abs-style time by adding SECONDS_POINT. */
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return abs_seconds_to_locktime(seconds + SECONDS_POINT, &rel->locktime);
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#endif
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}
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bool blocks_to_rel_locktime(u32 blocks, struct rel_locktime *rel)
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{
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#ifdef HAS_BIP68
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if (blocks > BIP68_LOCKTIME_MASK)
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return false;
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#endif
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rel->locktime = blocks;
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return true;
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}
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bool rel_locktime_is_seconds(const struct rel_locktime *rel)
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{
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#ifdef HAS_BIP68
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return rel->locktime & BIP68_SECONDS_FLAG;
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#else
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return abs_is_seconds(rel->locktime);
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#endif
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}
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u32 rel_locktime_to_seconds(const struct rel_locktime *rel)
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{
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assert(rel_locktime_is_seconds(rel));
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#ifdef HAS_BIP68
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return rel->locktime & BIP68_LOCKTIME_MASK;
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#else
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return rel->locktime - SECONDS_POINT;
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#endif
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}
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u32 bitcoin_nsequence(const struct rel_locktime *rel)
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{
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#ifdef HAS_BIP68
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/* Can't set disable bit, or other bits except low 16 and bit 22 */
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assert(!(rel->locktime & ~(BIP68_SECONDS_FLAG|BIP68_LOCKTIME_MASK)));
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return rel->locktime;
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#else
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/* Alpha uses the original proposal: simply invert the bits. */
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return ~rel->locktime;
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#endif
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}
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bool seconds_to_abs_locktime(u32 seconds, struct abs_locktime *abs)
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{
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return abs_seconds_to_locktime(seconds, &abs->locktime);
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}
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bool blocks_to_abs_locktime(u32 blocks, struct abs_locktime *abs)
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{
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return abs_blocks_to_locktime(blocks, &abs->locktime);
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}
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bool abs_locktime_is_seconds(const struct abs_locktime *abs)
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{
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return abs_is_seconds(abs->locktime);
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}
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