ethers.js/lib.esm/abi/coders/number.js
2022-11-30 15:44:23 -05:00

45 lines
1.6 KiB
JavaScript

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