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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Text;
using Xunit;
namespace System.Buffers.Text.Tests
{
public class Base64EncoderUnitTests
{
[Fact]
public void BasicEncodingAndDecoding()
{
var bytes = new byte[byte.MaxValue + 1];
for (int i = 0; i < byte.MaxValue + 1; i++)
{
bytes[i] = (byte)i;
}
for (int value = 0; value < 256; value++)
{
Span<byte> sourceBytes = bytes.AsSpan().Slice(0, value + 1);
Span<byte> encodedBytes = new byte[Base64.GetMaxEncodedToUtf8Length(sourceBytes.Length)];
Assert.Equal(OperationStatus.Done, Base64.EncodeToUtf8(sourceBytes, encodedBytes, out int consumed, out int encodedBytesCount));
Assert.Equal(sourceBytes.Length, consumed);
Assert.Equal(encodedBytes.Length, encodedBytesCount);
string encodedText = Encoding.ASCII.GetString(encodedBytes.ToArray());
string expectedText = Convert.ToBase64String(bytes, 0, value + 1);
Assert.Equal(expectedText, encodedText);
if (encodedBytes.Length % 4 == 0)
{
Span<byte> decodedBytes = new byte[Base64.GetMaxDecodedFromUtf8Length(encodedBytes.Length)];
Assert.Equal(OperationStatus.Done, Base64.DecodeFromUtf8(encodedBytes, decodedBytes, out consumed, out int decodedByteCount));
Assert.Equal(encodedBytes.Length, consumed);
Assert.Equal(sourceBytes.Length, decodedByteCount);
Assert.True(sourceBytes.SequenceEqual(decodedBytes.Slice(0, decodedByteCount)));
}
}
}
[Fact]
public void BasicEncoding()
{
var rnd = new Random(42);
for (int i = 0; i < 10; i++)
{
int numBytes = rnd.Next(100, 1000 * 1000);
Span<byte> source = new byte[numBytes];
Base64TestHelper.InitalizeBytes(source, numBytes);
Span<byte> encodedBytes = new byte[Base64.GetMaxEncodedToUtf8Length(source.Length)];
Assert.Equal(OperationStatus.Done, Base64.EncodeToUtf8(source, encodedBytes, out int consumed, out int encodedBytesCount));
Assert.Equal(source.Length, consumed);
Assert.Equal(encodedBytes.Length, encodedBytesCount);
Assert.True(Base64TestHelper.VerifyEncodingCorrectness(source.Length, encodedBytes.Length, source, encodedBytes));
}
}
[Fact]
public void EncodeEmptySpan()
{
Span<byte> source = Span<byte>.Empty;
Span<byte> encodedBytes = new byte[Base64.GetMaxEncodedToUtf8Length(source.Length)];
Assert.Equal(OperationStatus.Done, Base64.EncodeToUtf8(source, encodedBytes, out int consumed, out int encodedBytesCount));
Assert.Equal(source.Length, consumed);
Assert.Equal(encodedBytes.Length, encodedBytesCount);
Assert.True(Base64TestHelper.VerifyEncodingCorrectness(source.Length, encodedBytes.Length, source, encodedBytes));
}
[Fact]
[OuterLoop]
public void EncodeTooLargeSpan()
{
// int.MaxValue - (int.MaxValue % 4) => 2147483644, largest multiple of 4 less than int.MaxValue
// CLR default limit of 2 gigabytes (GB).
try
{
// 1610612734, larger than MaximumEncodeLength, requires output buffer of size 2147483648 (which is > int.MaxValue)
Span<byte> source = new byte[(int.MaxValue >> 2) * 3 + 1];
Span<byte> encodedBytes = new byte[2000000000];
Assert.Equal(OperationStatus.DestinationTooSmall, Base64.EncodeToUtf8(source, encodedBytes, out int consumed, out int encodedBytesCount));
Assert.Equal((encodedBytes.Length >> 2) * 3, consumed); // encoding 1500000000 bytes fits into buffer of 2000000000 bytes
Assert.Equal(encodedBytes.Length, encodedBytesCount);
}
catch (OutOfMemoryException)
{
// do nothing
}
}
[Fact]
public void BasicEncodingWithFinalBlockFalse()
{
var rnd = new Random(42);
for (int i = 0; i < 10; i++)
{
int numBytes = rnd.Next(100, 1000 * 1000);
Span<byte> source = new byte[numBytes];
Base64TestHelper.InitalizeBytes(source, numBytes);
Span<byte> encodedBytes = new byte[Base64.GetMaxEncodedToUtf8Length(source.Length)];
int expectedConsumed = source.Length / 3 * 3; // only consume closest multiple of three since isFinalBlock is false
int expectedWritten = source.Length / 3 * 4;
Assert.Equal(OperationStatus.NeedMoreData, Base64.EncodeToUtf8(source, encodedBytes, out int consumed, out int encodedBytesCount, isFinalBlock: false));
Assert.Equal(expectedConsumed, consumed);
Assert.Equal(expectedWritten, encodedBytesCount);
Assert.True(Base64TestHelper.VerifyEncodingCorrectness(expectedConsumed, expectedWritten, source, encodedBytes));
}
}
[Theory]
[InlineData(1, "", 0, 0)]
[InlineData(2, "", 0, 0)]
[InlineData(3, "AQID", 3, 4)]
[InlineData(4, "AQID", 3, 4)]
[InlineData(5, "AQID", 3, 4)]
[InlineData(6, "AQIDBAUG", 6, 8)]
[InlineData(7, "AQIDBAUG", 6, 8)]
public void BasicEncodingWithFinalBlockFalseKnownInput(int numBytes, string expectedText, int expectedConsumed, int expectedWritten)
{
Span<byte> source = new byte[numBytes];
for (int i = 0; i < numBytes; i++)
{
source[i] = (byte)(i + 1);
}
Span<byte> encodedBytes = new byte[Base64.GetMaxEncodedToUtf8Length(source.Length)];
Assert.Equal(OperationStatus.NeedMoreData, Base64.EncodeToUtf8(source, encodedBytes, out int consumed, out int encodedBytesCount, isFinalBlock: false));
Assert.Equal(expectedConsumed, consumed);
Assert.Equal(expectedWritten, encodedBytesCount);
string encodedText = Encoding.ASCII.GetString(encodedBytes.Slice(0, expectedWritten).ToArray());
Assert.Equal(expectedText, encodedText);
}
[Theory]
[InlineData(1, "AQ==", 1, 4)]
[InlineData(2, "AQI=", 2, 4)]
[InlineData(3, "AQID", 3, 4)]
[InlineData(4, "AQIDBA==", 4, 8)]
[InlineData(5, "AQIDBAU=", 5, 8)]
[InlineData(6, "AQIDBAUG", 6, 8)]
[InlineData(7, "AQIDBAUGBw==", 7, 12)]
public void BasicEncodingWithFinalBlockTrueKnownInput(int numBytes, string expectedText, int expectedConsumed, int expectedWritten)
{
Span<byte> source = new byte[numBytes];
for (int i = 0; i < numBytes; i++)
{
source[i] = (byte)(i + 1);
}
Span<byte> encodedBytes = new byte[Base64.GetMaxEncodedToUtf8Length(source.Length)];
Assert.Equal(OperationStatus.Done, Base64.EncodeToUtf8(source, encodedBytes, out int consumed, out int encodedBytesCount, isFinalBlock: true));
Assert.Equal(expectedConsumed, consumed);
Assert.Equal(expectedWritten, encodedBytesCount);
string encodedText = Encoding.ASCII.GetString(encodedBytes.Slice(0, expectedWritten).ToArray());
Assert.Equal(expectedText, encodedText);
}
[Fact]
public void EncodingOutputTooSmall()
{
for (int numBytes = 4; numBytes < 20; numBytes++)
{
Span<byte> source = new byte[numBytes];
Base64TestHelper.InitalizeBytes(source, numBytes);
Span<byte> encodedBytes = new byte[4];
Assert.Equal(OperationStatus.DestinationTooSmall,
Base64.EncodeToUtf8(source, encodedBytes, out int consumed, out int written));
int expectedConsumed = 3;
Assert.Equal(expectedConsumed, consumed);
Assert.Equal(encodedBytes.Length, written);
Assert.True(Base64TestHelper.VerifyEncodingCorrectness(expectedConsumed, encodedBytes.Length, source, encodedBytes));
}
}
[Fact]
public void EncodingOutputTooSmallRetry()
{
Span<byte> source = new byte[750];
Base64TestHelper.InitalizeBytes(source);
int outputSize = 320;
int requiredSize = Base64.GetMaxEncodedToUtf8Length(source.Length);
Span<byte> encodedBytes = new byte[outputSize];
Assert.Equal(OperationStatus.DestinationTooSmall,
Base64.EncodeToUtf8(source, encodedBytes, out int consumed, out int written));
int expectedConsumed = encodedBytes.Length / 4 * 3;
Assert.Equal(expectedConsumed, consumed);
Assert.Equal(encodedBytes.Length, written);
Assert.True(Base64TestHelper.VerifyEncodingCorrectness(expectedConsumed, encodedBytes.Length, source, encodedBytes));
encodedBytes = new byte[requiredSize - outputSize];
source = source.Slice(consumed);
Assert.Equal(OperationStatus.Done,
Base64.EncodeToUtf8(source, encodedBytes, out consumed, out written));
expectedConsumed = encodedBytes.Length / 4 * 3;
Assert.Equal(expectedConsumed, consumed);
Assert.Equal(encodedBytes.Length, written);
Assert.True(Base64TestHelper.VerifyEncodingCorrectness(expectedConsumed, encodedBytes.Length, source, encodedBytes));
}
[Fact]
public void GetMaxEncodedLength()
{
// (int.MaxValue - 4)/(4/3) => 1610612733, otherwise integer overflow
int[] input = { 0, 1, 2, 3, 4, 5, 6, 1610612728, 1610612729, 1610612730, 1610612731, 1610612732, 1610612733 };
int[] expected = { 0, 4, 4, 4, 8, 8, 8, 2147483640, 2147483640, 2147483640, 2147483644, 2147483644, 2147483644 };
for (int i = 0; i < input.Length; i++)
{
Assert.Equal(expected[i], Base64.GetMaxEncodedToUtf8Length(input[i]));
}
// integer overflow
Assert.Throws<ArgumentOutOfRangeException>(() => Base64.GetMaxEncodedToUtf8Length(1610612734));
Assert.Throws<ArgumentOutOfRangeException>(() => Base64.GetMaxEncodedToUtf8Length(int.MaxValue));
// negative input
Assert.Throws<ArgumentOutOfRangeException>(() => Base64.GetMaxEncodedToUtf8Length(-1));
Assert.Throws<ArgumentOutOfRangeException>(() => Base64.GetMaxEncodedToUtf8Length(int.MinValue));
}
[Fact]
public void EncodeInPlace()
{
const int numberOfBytes = 15;
Span<byte> testBytes = new byte[numberOfBytes / 3 * 4]; // slack since encoding inflates the data
Base64TestHelper.InitalizeBytes(testBytes);
for (int numberOfBytesToTest = 0; numberOfBytesToTest <= numberOfBytes; numberOfBytesToTest++)
{
var expectedText = Convert.ToBase64String(testBytes.Slice(0, numberOfBytesToTest).ToArray());
Assert.Equal(OperationStatus.Done, Base64.EncodeToUtf8InPlace(testBytes, numberOfBytesToTest, out int bytesWritten));
Assert.Equal(Base64.GetMaxEncodedToUtf8Length(numberOfBytesToTest), bytesWritten);
var encodedText = Encoding.ASCII.GetString(testBytes.Slice(0, bytesWritten).ToArray());
Assert.Equal(expectedText, encodedText);
}
}
[Fact]
public void EncodeInPlaceOutputTooSmall()
{
byte[] testBytes = { 1, 2, 3 };
for (int numberOfBytesToTest = 1; numberOfBytesToTest <= testBytes.Length; numberOfBytesToTest++)
{
Assert.Equal(OperationStatus.DestinationTooSmall, Base64.EncodeToUtf8InPlace(testBytes, numberOfBytesToTest, out int bytesWritten));
Assert.Equal(0, bytesWritten);
}
}
[Fact]
public void EncodeInPlaceDataLengthTooLarge()
{
byte[] testBytes = { 1, 2, 3 };
Assert.Equal(OperationStatus.DestinationTooSmall, Base64.EncodeToUtf8InPlace(testBytes, testBytes.Length + 1, out int bytesWritten));
Assert.Equal(0, bytesWritten);
}
}
}
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