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Copy bip68 library code and adapt it to TypeScript
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| // Code taken and adapted from https://github.com/bitcoinjs/bip68 | ||
| // If we make signficant changes to this code, we should also take and adapt the tests from that repository. | ||
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| // see https://github.com/bitcoin/bips/blob/master/bip-0068.mediawiki#compatibility | ||
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| const SEQUENCE_FINAL = 0xffffffff; | ||
| const SEQUENCE_LOCKTIME_DISABLE_FLAG = (1 << 31); | ||
| const SEQUENCE_LOCKTIME_GRANULARITY = 9; | ||
| const SEQUENCE_LOCKTIME_MASK = 0x0000ffff; | ||
| const SEQUENCE_LOCKTIME_TYPE_FLAG = (1 << 22); | ||
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| const BLOCKS_MAX = SEQUENCE_LOCKTIME_MASK; | ||
| const SECONDS_MOD = 1 << SEQUENCE_LOCKTIME_GRANULARITY; | ||
| const SECONDS_MAX = SEQUENCE_LOCKTIME_MASK << SEQUENCE_LOCKTIME_GRANULARITY; | ||
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| interface DecodedSequence { | ||
| blocks?: number; | ||
| seconds?: number; | ||
| } | ||
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| export function decodeBip68(sequence: number): DecodedSequence { | ||
| // If the disable flag is set, we return an empty object | ||
| if (sequence & SEQUENCE_LOCKTIME_DISABLE_FLAG) return {}; | ||
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| // If the SEQUENCE_LOCKTIME_TYPE_FLAG is set, that means that the sequence is in seconds | ||
| if (sequence & SEQUENCE_LOCKTIME_TYPE_FLAG) { | ||
| // If the sequence is in seconds, we need to shift it by the granularity | ||
| // (because every "unit" of time corresponds to 512 seconds) | ||
| const seconds = (sequence & SEQUENCE_LOCKTIME_MASK) << SEQUENCE_LOCKTIME_GRANULARITY; | ||
| return { seconds }; | ||
| } | ||
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| // If the disable flag is not set, and the SEQUENCE_LOCKTIME_TYPE_FLAG is not set, the sequence is in blocks | ||
| const blocks = sequence & SEQUENCE_LOCKTIME_MASK; | ||
| return { blocks }; | ||
| } | ||
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| export function encodeBip68({ blocks, seconds }: DecodedSequence): number { | ||
| if (blocks !== undefined && seconds !== undefined) throw new TypeError('Cannot encode blocks AND seconds'); | ||
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| // If the input is correct, we encode it as a sequence in seconds (using the SEQUENCE_LOCKTIME_TYPE_FLAG) | ||
| if (seconds !== undefined) { | ||
| if (!Number.isFinite(seconds)) throw new TypeError('Expected Number seconds'); | ||
| if (seconds > SECONDS_MAX) throw new TypeError('Expected Number seconds <= ' + SECONDS_MAX); | ||
| if (seconds % SECONDS_MOD !== 0) throw new TypeError('Expected Number seconds as a multiple of ' + SECONDS_MOD); | ||
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| return SEQUENCE_LOCKTIME_TYPE_FLAG | (seconds >> SEQUENCE_LOCKTIME_GRANULARITY); | ||
| } | ||
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| // If the input is correct, we return the blocks (no further encoding needed) | ||
| if (blocks !== undefined) { | ||
| if (!Number.isFinite(blocks)) throw new TypeError('Expected Number blocks'); | ||
| if (blocks > SEQUENCE_LOCKTIME_MASK) throw new TypeError('Expected Number blocks <= ' + BLOCKS_MAX); | ||
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| return blocks; | ||
| } | ||
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| // If neither blocks nor seconds are provided, we assume the sequence is final | ||
| return SEQUENCE_FINAL; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,7 +1,8 @@ | ||
| export * from './artifact.js'; | ||
| export * from './bip68.js'; | ||
| export * from './bitauth-script.js'; | ||
| export * from './data.js'; | ||
| export * from './hash.js'; | ||
| export * from './script.js'; | ||
| export * from './types.js'; | ||
| export * from './source-map.js'; | ||
| export * from './bitauth-script.js'; | ||
| export * from './types.js'; |
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