64 lines
1.8 KiB
TypeScript
64 lines
1.8 KiB
TypeScript
import {
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defineProperties, fromTwos, getBigInt, mask, toTwos
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} from "../../utils/index.js";
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import { Typed } from "../typed.js";
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import { Coder, WordSize } from "./abstract-coder.js";
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import type { BigNumberish } from "../../utils/index.js";
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import type { Reader, Writer } from "./abstract-coder.js";
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const BN_0 = BigInt(0);
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const BN_1 = BigInt(1);
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const BN_MAX_UINT256 = BigInt("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
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/**
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* @_ignore
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*/
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export class NumberCoder extends Coder {
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readonly size!: number;
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readonly signed!: boolean;
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constructor(size: number, signed: boolean, localName: string) {
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const name = ((signed ? "int": "uint") + (size * 8));
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super(name, name, localName, false);
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defineProperties<NumberCoder>(this, { size, signed }, { size: "number", signed: "boolean" });
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}
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defaultValue(): number {
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return 0;
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}
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encode(writer: Writer, _value: BigNumberish | Typed): number {
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let value = getBigInt(Typed.dereference(_value, this.type));
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// Check bounds are safe for encoding
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let maxUintValue = mask(BN_MAX_UINT256, WordSize * 8);
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if (this.signed) {
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let bounds = mask(maxUintValue, (this.size * 8) - 1);
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if (value > bounds || value < -(bounds + BN_1)) {
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this._throwError("value out-of-bounds", _value);
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}
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value = toTwos(value, 8 * WordSize);
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} else if (value < BN_0 || value > mask(maxUintValue, this.size * 8)) {
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this._throwError("value out-of-bounds", _value);
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}
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return writer.writeValue(value);
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}
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decode(reader: Reader): any {
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let value = mask(reader.readValue(), this.size * 8);
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if (this.signed) {
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value = fromTwos(value, this.size * 8);
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}
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return value;
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}
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}
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