69 lines
2.1 KiB
JavaScript
69 lines
2.1 KiB
JavaScript
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import { logger } from "./logger.js";
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// IEEE 754 support 53-bits of mantissa
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const maxValue = 0x1fffffffffffff;
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const nibbles = "0123456789abcdef";
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const BN_0 = BigInt(0);
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// Converts a value to a BigInt, including big endian data
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export function toBigInt(_value) {
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if (_value instanceof Uint8Array) {
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let result = "0x0";
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for (const v of _value) {
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result += nibbles[v >> 4];
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result += nibbles[v & 0x0f];
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}
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return BigInt(result);
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}
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return logger.getBigInt(_value, "value");
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}
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export function toNumber(_value) {
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const value = toBigInt(_value);
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if (value < -maxValue || value > maxValue) {
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logger.throwArgumentError("overflow", "value", _value);
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}
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return Number(value);
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}
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// Converts value to hex, optionally padding on the left to width bytes
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export function toHex(_value, _width) {
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const value = logger.getBigInt(_value, "value");
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if (value < 0) {
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throw new Error("cannot convert negative value to hex");
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}
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let result = value.toString(16);
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if (_width == null) {
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// Ensure the value is of even length
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if (result.length % 2) {
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result = "0" + result;
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}
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}
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else {
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const width = logger.getNumber(_width, "width");
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if (width * 2 < result.length) {
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throw new Error(`value ${value} exceeds width ${width}`);
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}
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// Pad the value to the required width
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while (result.length < (width * 2)) {
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result = "0" + result;
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}
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}
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return "0x" + result;
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}
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export function toArray(_value) {
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const value = logger.getBigInt(_value, "value");
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if (value < 0) {
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throw new Error("cannot convert negative value to hex");
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}
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if (value === BN_0) {
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return new Uint8Array([]);
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}
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let hex = value.toString(16);
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if (hex.length % 2) {
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hex = "0" + hex;
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}
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const result = new Uint8Array(hex.length / 2);
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for (let i = 0; i < result.length; i++) {
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const offset = i * 2;
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result[i] = parseInt(hex.substring(offset, offset + 2), 16);
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}
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return result;
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}
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//# sourceMappingURL=convert.js.map
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