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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.// Copyright 2020 Keith Cirkel. All rights reserved. MIT license.// This implementation is a port of https://deno.land/x/varint@v2.0.0 by @keithamus
import { assertEquals, assertThrows } from "../testing/asserts.ts";import {  decode,  decode32,  encode,  MaxUInt64,  MaxVarIntLen64,} from "./varint.ts";
function encodeDecode(i: number | bigint) {  const [buf, n] = encode(i, new Uint8Array(MaxVarIntLen64));  const fn = (typeof i === "bigint") ? decode : decode32;  const [j, m] = fn(buf);  assertEquals(i, j, `${fn.name}(encode(${i})): ${i} !== ${j}`);  assertEquals(n, m, `${fn.name}(encode(${i})): buffer lengths ${n} !== ${m}`);}
Deno.test("VarInt decode manual", () => {  assertEquals(decode(Uint8Array.of(172, 2)), [300n, 2]);});Deno.test("VarInt decode max size", () => {  assertEquals(    decode(Uint8Array.of(255, 255, 255, 255, 255, 255, 255, 255, 255, 1)),    [18446744073709551615n, 10],  );});Deno.test("VarInt decode overflow", () => {  assertThrows(    () => decode(Uint8Array.of(255, 255, 255, 255, 255, 255, 255, 255, 255, 2)),    RangeError,  );});Deno.test("VarInt decode with offset", () => {  assertEquals(    decode(      Uint8Array.of(        255,        255,        255,        255,        255,        255,        255,        255,        255,        255,        255,        255,        255,        1,      ),      4,    ),    [18446744073709551615n, 14],  );});Deno.test("VarInt decode32 manual", () => {  assertEquals(decode32(Uint8Array.of(172, 2)), [300, 2]);});Deno.test("VarInt decode32 max size", () => {  assertEquals(    decode32(Uint8Array.of(255, 255, 255, 255, 15, 0, 0, 0, 0, 0)),    [4294967295, 5],  );});Deno.test("VarInt decode32 overflow", () => {  assertThrows(    () =>      decode32(Uint8Array.of(255, 255, 255, 255, 255, 255, 255, 255, 15, 0)),    RangeError,  );});Deno.test("VarInt decode32 with offset", () => {  assertEquals(    decode32(Uint8Array.of(255, 255, 255, 255, 255, 255, 255, 255, 15, 0), 4),    [4294967295, 9],  );});Deno.test("VarInt encode manual", () => {  assertEquals(encode(300, new Uint8Array(2)), [Uint8Array.of(172, 2), 2]);  assertEquals(    encode(4294967295),    [Uint8Array.of(255, 255, 255, 255, 15), 5],  );  assertEquals(    encode(18446744073709551615n),    [Uint8Array.of(255, 255, 255, 255, 255, 255, 255, 255, 255, 1), 10],  );});Deno.test("VarInt encode overflow with negative", () => {  assertThrows(() => encode(-1), RangeError);});Deno.test("VarInt encode with offset", () => {  let uint = new Uint8Array(3);  assertEquals(    encode(300, uint, 1),    [Uint8Array.of(172, 2), 3],  );  assertEquals(uint, Uint8Array.of(0, 172, 2));  uint = new Uint8Array(MaxVarIntLen64);  uint[0] = uint[1] = uint[2] = 12;  assertEquals(    encode(4294967295, uint, 3),    [Uint8Array.of(255, 255, 255, 255, 15), 8],  );  assertEquals(uint, Uint8Array.of(12, 12, 12, 255, 255, 255, 255, 15, 0, 0));});Deno.test("VarInt encode<->decode", () => {  for (    const i of [      0n,      1n,      2n,      10n,      20n,      63n,      64n,      65n,      127n,      128n,      129n,      255n,      256n,      257n,      300n,      18446744073709551615n,    ]  ) {    encodeDecode(i);  }  for (let i = 0x7n; i < MaxUInt64; i <<= 1n) {    encodeDecode(i);  }});Deno.test("VarInt encode<->decode32", () => {  for (    const i of [      0,      1,      2,      10,      20,      63,      64,      65,      127,      128,      129,      255,      256,      257,      300,      4294967295,    ]  ) {    encodeDecode(i);  }  for (let i = 0x7; i > 0; i <<= 1) {    encodeDecode(i);  }});