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/*
* Copyright (c) 2023 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.UtilsTests
* File: VnEncodingTests.cs
*
* VnEncodingTests.cs is part of VNLib.UtilsTests which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.UtilsTests is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation, either version 2 of the License,
* or (at your option) any later version.
*
* VNLib.UtilsTests is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with VNLib.UtilsTests. If not, see http://www.gnu.org/licenses/.
*/
using System;
using System.Linq;
using System.Text;
using System.Buffers;
using System.Diagnostics;
using System.Buffers.Text;
using System.Security.Cryptography;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace VNLib.Utils.Tests
{
[TestClass()]
public class VnEncodingTests
{
[TestMethod()]
public void Base64ToUrlSafeInPlaceTest()
{
//Get randomd data to encode
byte[] dataToEncode = RandomNumberGenerator.GetBytes(64);
//Calc buffer size
int base64Output = Base64.GetMaxEncodedToUtf8Length(64);
byte[] encodeBuffer = new byte[base64Output];
//Base64 encode
OperationStatus status = Base64.EncodeToUtf8(dataToEncode, encodeBuffer, out _, out int bytesEncoded, true);
Assert.IsTrue(status == OperationStatus.Done);
Span<byte> encodeSpan = encodeBuffer.AsSpan(0, bytesEncoded);
//Make sure some illegal characters are encoded
Assert.IsTrue(encodeSpan.Contains((byte)'+') || encodeSpan.Contains((byte)'/'));
//Convert to url safe
VnEncoding.Base64ToUrlSafeInPlace(encodeSpan);
//Make sure the illegal characters are gone
Assert.IsFalse(encodeSpan.Contains((byte)'+') || encodeSpan.Contains((byte)'/'));
}
[TestMethod()]
public void Base64FromUrlSafeInPlaceTest()
{
//url safe base64 with known encoded characters
const string base64UrlSafe = "lZUABUd8q2BS7p8giysuC7PpEabAFBnMqBPL-9A-qgfR1lbTHQ4tMm8E8nimm2YAd5NGDIQ0vxfU9i5l53tF_WXa_H4vkHfzlv0Df-lLADJV7z8sn-8sfUGdaAiIS8_4OmVGnnY4-TppLMsVR6ov2t07HdOHPPsFFhSpBMXa2pwRveRATcxBA2XxVe09FOWgahhssNS7lU9eC7fRw7icD4ZoJcLSRBbxrjRmeVXKhPIaXR-4mnQ5-vqYzAr9S99CthgbAtVn_WjmDcda6pUB9JW9lp7ylDa9e1r_z39cihTXMOGaUSjVURJaWrNF8CkfW56_x2ODCBmZPov1YyEhww==";
//Convert to utf8 binary
byte[] utf8 = Encoding.UTF8.GetBytes(base64UrlSafe);
//url decode
VnEncoding.Base64FromUrlSafeInPlace(utf8);
//Confirm illegal chars have been converted back to base64
Assert.IsFalse(utf8.Contains((byte)'_') || utf8.Contains((byte)'-'));
//Decode in place to confrim its valid
OperationStatus status = Base64.DecodeFromUtf8InPlace(utf8, out int bytesWritten);
Assert.IsFalse(status == OperationStatus.NeedMoreData);
Assert.IsFalse(status == OperationStatus.DestinationTooSmall);
Assert.IsFalse(status == OperationStatus.InvalidData);
}
[TestMethod()]
public void TryToBase64CharsTest()
{
}
[TestMethod()]
public void PercentEncodeTest()
{
const string urlEnoded = "https%3A%2F%2Fwww.google.com%2Fsearch%3Fq%3Dtest%26oq%3Dtest%26aqs%3Dchrome..69i57j0l7.1001j0j7%26sourceid%3Dchrome%26ie%3DUTF-8";
const string urlDecoded = "https://www.google.com/search?q=test&oq=test&aqs=chrome..69i57j0l7.1001j0j7&sourceid=chrome&ie=UTF-8";
//We need to allow the '.' character to be encoded
ReadOnlySpan<byte> allowedChars = Encoding.UTF8.GetBytes(".");
/*
* Test that the url encoded string is the same as the percent encoded string
*/
ReadOnlySpan<byte> utf8Encoded = Encoding.UTF8.GetBytes(urlDecoded);
string percentEncoded = VnEncoding.PercentEncode(utf8Encoded, allowedChars);
Assert.IsTrue(percentEncoded.Equals(urlEnoded, StringComparison.Ordinal));
/*
* Test decoding the percent encoded string
*/
ReadOnlySpan<byte> percentEncodedUtf8 = Encoding.UTF8.GetBytes(urlEnoded);
byte[] outBuffer = new byte[percentEncodedUtf8.Length];
ERRNO decoded = VnEncoding.PercentDecode(percentEncodedUtf8, outBuffer);
//Make sure result is valid
Debug.Assert(decoded > 0);
string decodedString = Encoding.UTF8.GetString(outBuffer, 0, decoded);
Assert.IsTrue(decodedString.Equals(urlDecoded, StringComparison.Ordinal));
}
[TestMethod()]
public void Base32BasicEncodeDecodeTest()
{
const string base32Encoded = "JBSWY3DPEBLW64TMMQQQ====";
const string base32Decoded = "Hello World!";
byte[] rawBytes = Encoding.UTF8.GetBytes(base32Decoded);
//Recover bytes from base32 encoded string
byte[]? fromString = VnEncoding.FromBase32String(base32Encoded);
Assert.IsNotNull(fromString);
//Test that the decoded bytes are the same as the raw bytes
Assert.IsTrue(rawBytes.SequenceEqual(fromString));
//Test that the encoded string is the same as the base32 encoded string
string toString = VnEncoding.ToBase32String(rawBytes, true);
Assert.IsTrue(toString.Equals(base32Encoded, StringComparison.Ordinal));
}
}
}
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