47 lines
1.8 KiB
JavaScript
47 lines
1.8 KiB
JavaScript
import { fromTwos, mask, toTwos } from "../../utils/maths.js";
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import { defineProperties } from "../../utils/properties.js";
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import { logger } from "../../utils/logger.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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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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export class NumberCoder extends Coder {
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size;
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signed;
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constructor(size, signed, localName) {
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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(this, { size, signed }, { size: "number", signed: "boolean" });
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}
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defaultValue() {
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return 0;
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}
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encode(writer, _value) {
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let value = logger.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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}
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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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value = mask(toTwos(value, this.size * 8), this.size * 8);
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if (this.signed) {
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value = toTwos(fromTwos(value, this.size * 8), 8 * WordSize);
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}
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return writer.writeValue(value);
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}
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decode(reader) {
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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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//# sourceMappingURL=number.js.map
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