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system/node_modules/ethers/src.ts/abi/coders/number.ts

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+import {
+    defineProperties, fromTwos, getBigInt, mask, toTwos
+} from "../../utils/index.js";
+
+import { Typed } from "../typed.js";
+import { Coder, WordSize } from "./abstract-coder.js";
+
+import type { BigNumberish } from "../../utils/index.js";
+
+import type { Reader, Writer } 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 {
+    readonly size!: number;
+    readonly signed!: boolean;
+
+    constructor(size: number, signed: boolean, localName: string) {
+        const name = ((signed ? "int": "uint") + (size * 8));
+        super(name, name, localName, false);
+
+        defineProperties<NumberCoder>(this, { size, signed }, { size: "number", signed: "boolean" });
+    }
+
+    defaultValue(): number {
+        return 0;
+    }
+
+    encode(writer: Writer, _value: BigNumberish | Typed): number {
+        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: Reader): any {
+        let value = mask(reader.readValue(), this.size * 8);
+
+        if (this.signed) {
+            value = fromTwos(value, this.size * 8);
+        }
+
+        return value;
+    }
+}
+