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<?php |
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namespace BitWasp\Bitcoin; |
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class Locktime |
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{ |
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const INT_MAX = 0xffffffff; |
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/** |
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* Maximum block height that can be used in locktime, as beyond |
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* this is reserved for timestamp locktimes |
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*/ |
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const BLOCK_MAX = 500000000; |
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/** |
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* Maximum timestamp that can be encoded in locktime |
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* (TIME_MAX + BLOCK_MAX = INT_MAX) |
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*/ |
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const TIME_MAX = self::INT_MAX - self::BLOCK_MAX; |
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/** |
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* Convert a $timestamp to a locktime. |
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* Max timestamp is 3794967296 - 04/04/2090 @ 5:34am (UTC) |
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* |
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* @param int $timestamp |
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* @return int |
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* @throws \Exception |
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*/ |
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public function fromTimestamp($timestamp) |
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{ |
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if ($timestamp > self::TIME_MAX) { |
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throw new \Exception('Timestamp out of range'); |
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} |
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$locktime = self::BLOCK_MAX + $timestamp; |
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return $locktime; |
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} |
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/** |
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* Convert a lock time to the timestamp it's locked to. |
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* Throws an exception when: |
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* - Lock time appears to be in the block locktime range ( < Locktime::BLOCK_MAX ) |
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* - When the lock time exceeds the max possible lock time ( > Locktime::INT_MAX ) |
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* |
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* @param int $lockTime |
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* @return int |
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* @throws \Exception |
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*/ |
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public function toTimestamp($lockTime) |
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{ |
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if ($lockTime <= self::BLOCK_MAX) { |
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throw new \Exception('Lock time out of range for timestamp'); |
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} |
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if ($lockTime > self::INT_MAX) { |
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throw new \Exception('Lock time too large'); |
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} |
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$timestamp = $lockTime - self::BLOCK_MAX; |
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return $timestamp; |
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} |
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/** |
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* Convert $blockHeight to lock time. Doesn't convert anything really, |
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* but does check the bounds of the given block height. |
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* |
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* @param int $blockHeight |
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* @return int |
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* @throws \Exception |
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*/ |
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public function fromBlockHeight($blockHeight) |
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{ |
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if ($blockHeight > self::BLOCK_MAX) { |
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throw new \Exception('This block height is too high'); |
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} |
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return $blockHeight; |
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} |
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/** |
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* Convert locktime to block height tx is locked to. Doesn't convert anything |
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* really, but does check the bounds of the supplied locktime. |
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* |
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* @param int $lockTime |
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* @return int |
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* @throws \Exception |
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*/ |
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public function toBlockHeight($lockTime) |
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{ |
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if ($lockTime >= self::BLOCK_MAX) { |
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throw new \Exception('This locktime is out of range for a block height'); |
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} |
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return $lockTime; |
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} |
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} |
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Bit-Wasp /
bitcoin-php
