45 lines
1.6 KiB
JavaScript
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;
|
|
}
|
|
}
|
|
//# sourceMappingURL=number.js.map
|