43 lines
1.2 KiB
TypeScript
43 lines
1.2 KiB
TypeScript
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import { logger } from "./logger.js";
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import type { BigNumberish, Numeric } from "@ethersproject/logger";
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const BN_0 = BigInt(0);
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const BN_1 = BigInt(1);
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// Convert a value from a twos-compliment value
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export function fromTwos(_value: BigNumberish, _width: Numeric): bigint {
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const value = logger.getBigInt(_value, "value");
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const width = BigInt(logger.getNumber(_width, "width"));
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// Top bit set; treat as a negative value
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if (value >> (width - BN_1)) {
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const mask = (BN_1 << width) - BN_1;
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return -(((~value) & mask) + BN_1);
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}
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return value;
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}
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// Convert value to a twos-compliment value
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export function toTwos(_value: BigNumberish, _width: Numeric): bigint {
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const value = logger.getBigInt(_value, "value");
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const width = BigInt(logger.getNumber(_width, "width"));
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if (value < BN_0) {
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const mask = (BN_1 << width) - BN_1;
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return ((~(-value)) & mask) + BN_1;
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}
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return value;
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}
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export function mask(_value: BigNumberish, _bits: Numeric): bigint {
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const value = logger.getBigInt(_value, "value");
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const bits = logger.getBigInt(_bits, "bits");
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return value & ((BN_1 << bits) - BN_1);
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}
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