public void EncodedSpan_1_to_50_given___correct_decoded_len()
{
var sut = new Base64Encoder();
Assert.Multiple(() =>
{
for (int i = 1; i < 50; ++i)
{
var data = new byte[i];
string base64 = Convert.ToBase64String(data);
int actual;
if (typeof(T) == typeof(byte))
{
byte[] base64Bytes = Encoding.ASCII.GetBytes(base64);
actual = sut.GetDecodedLength(base64Bytes);
}
else if (typeof(T) == typeof(char))
{
actual = sut.GetDecodedLength(base64.AsSpan());
}
else
{
throw new NotSupportedException(); // just in case new types are introduced in the future
}
Assert.AreEqual(i, actual);
}
});
}
public void Invalid_data_various_length___status_InvalidData()
{
var sut = new Base64Encoder();
var rnd = new Random(0);
for (int i = 4; i < 200; ++i)
{
var data = new byte[i];
rnd.NextBytes(data);
int encodedLength = sut.GetEncodedLength(data.Length);
Span <T> encoded = new T[encodedLength];
OperationStatus status = sut.EncodeCore(data, encoded, out int consumed, out int written);
Assume.That(status, Is.EqualTo(OperationStatus.Done));
Assume.That(consumed, Is.EqualTo(data.Length));
Assume.That(written, Is.EqualTo(encodedLength));
int decodedLength;
if (typeof(T) == typeof(byte))
{
Span <byte> tmp = MemoryMarshal.AsBytes(encoded);
decodedLength = sut.GetDecodedLength(tmp);
// Insert invalid data, just before eventual padding
tmp[tmp.Length - 3] = (byte)'~';
}
else if (typeof(T) == typeof(char))
{
Span <char> tmp = MemoryMarshal.Cast <T, char>(encoded);
decodedLength = sut.GetDecodedLength(tmp);
// Insert invalid data, just before eventual padding
tmp[tmp.Length - 3] = '~';
}
else
{
throw new NotSupportedException(); // just in case new types are introduced in the future
}
Span <byte> decoded = new byte[decodedLength];
status = sut.DecodeCore <T>(encoded, decoded, out consumed, out written);
// Invalid data is in the last 4 bytes, so everyting up to the last multiple of 4 is read.
int expectedConsumed = (encoded.Length - 3) / 4 * 4;
int expectedWritten = expectedConsumed / 4 * 3;
Assert.Multiple(() =>
{
Assert.AreEqual(OperationStatus.InvalidData, status);
Assert.AreEqual(expectedConsumed, consumed, "Fail at i = {0}", i);
Assert.AreEqual(expectedWritten, written, "Fail at i = {0}", i);
});
}
}
public void Invalid_data_various_length___status_InvalidData()
{
var sut = new Base64Encoder();
var rnd = new Random(0);
for (int i = 2; i < 200; ++i)
{
var data = new byte[i];
rnd.NextBytes(data);
int encodedLength = sut.GetEncodedLength(data.Length);
Span <T> encoded = new T[encodedLength];
OperationStatus status = sut.EncodeCore(data, encoded, out int consumed, out int written);
Assume.That(status, Is.EqualTo(OperationStatus.Done));
Assume.That(consumed, Is.EqualTo(data.Length));
Assume.That(written, Is.EqualTo(encodedLength));
int decodedLength;
if (typeof(T) == typeof(byte))
{
Span <byte> tmp = MemoryMarshal.AsBytes(encoded);
decodedLength = sut.GetDecodedLength(tmp);
// Insert invalid data
tmp[0] = (byte)'~';
}
else if (typeof(T) == typeof(char))
{
Span <char> tmp = MemoryMarshal.Cast <T, char>(encoded);
decodedLength = sut.GetDecodedLength(tmp);
// Insert invalid data
tmp[0] = '~';
}
else
{
throw new NotSupportedException(); // just in case new types are introduced in the future
}
Span <byte> decoded = new byte[decodedLength];
status = sut.DecodeCore <T>(encoded, decoded, out int _, out int _);
Assert.AreEqual(OperationStatus.InvalidData, status);
}
}
public void EncodedLength_is_int_Max___OK()
{
var sut = new Base64Encoder();
int actual = sut.GetDecodedLength(int.MaxValue);
Assert.AreEqual(int.MaxValue / 4 * 3, actual);
}
public void EncodedLength_is_0___0()
{
var sut = new Base64Encoder();
int actual = sut.GetDecodedLength(0);
Assert.AreEqual(0, actual);
}
public void Buffer_chain_various_length_decode()
{
var sut = new Base64Encoder();
var rnd = new Random(0);
for (int i = 2; i < 200; ++i)
{
var data = new byte[i];
rnd.NextBytes(data);
int encodedLength = sut.GetEncodedLength(data.Length);
Span <T> encoded = new T[encodedLength];
OperationStatus status = sut.EncodeCore(data, encoded, out int consumed, out int written);
Assume.That(status, Is.EqualTo(OperationStatus.Done), "fail at i = {0}", i);
Assume.That(consumed, Is.EqualTo(data.Length), "fail at i = {0}", i);
Assume.That(written, Is.EqualTo(encodedLength), "fail at i = {0}", i);
int decodedLength;
if (typeof(T) == typeof(byte))
{
decodedLength = sut.GetDecodedLength(MemoryMarshal.AsBytes(encoded));
}
else if (typeof(T) == typeof(char))
{
decodedLength = sut.GetDecodedLength(MemoryMarshal.Cast <T, char>(encoded));
}
else
{
throw new NotSupportedException(); // just in case new types are introduced in the future
}
Span <byte> decoded = new byte[decodedLength];
int partialLength = encoded.Length / 2;
status = sut.DecodeCore <T>(encoded.Slice(0, partialLength), decoded, out consumed, out int written1, isFinalBlock: false);
Assert.AreEqual(partialLength % 4 == 0 ? OperationStatus.Done : OperationStatus.NeedMoreData, status, "fail at i = {0}", i);
status = sut.DecodeCore <T>(encoded.Slice(consumed), decoded.Slice(written1), out consumed, out int written2, isFinalBlock: true);
Assert.AreEqual(OperationStatus.Done, status, "fail at i = {0}", i);
Assert.AreEqual(decodedLength, written1 + written2, "fail at i = {0}", i);
CollectionAssert.AreEqual(data, decoded.ToArray(), "fail at i = {0}", i);
}
}
public void Large_data___avx2_event_fired()
{
Assume.That(Avx2.IsSupported);
var sut = new Base64Encoder();
var data = new byte[50];
var rnd = new Random(0);
rnd.NextBytes(data);
int encodedLength = sut.GetEncodedLength(data.Length);
Span <T> encoded = new T[encodedLength];
OperationStatus status = sut.EncodeCore(data, encoded, out int consumed, out int written);
Assume.That(status, Is.EqualTo(OperationStatus.Done));
Assume.That(consumed, Is.EqualTo(data.Length));
Assume.That(written, Is.EqualTo(encodedLength));
int decodedLength;
if (typeof(T) == typeof(byte))
{
decodedLength = sut.GetDecodedLength(MemoryMarshal.AsBytes(encoded));
}
else if (typeof(T) == typeof(char))
{
decodedLength = sut.GetDecodedLength(MemoryMarshal.Cast <T, char>(encoded));
}
else
{
throw new NotSupportedException(); // just in case new types are introduced in the future
}
Span <byte> decoded = new byte[decodedLength];
bool avxExecuted = false;
Base64Encoder.Avx2Decoded += (s, e) => avxExecuted = true;
status = sut.DecodeCore <T>(encoded, decoded, out int _, out int _);
Assume.That(status, Is.EqualTo(OperationStatus.Done));
Assert.IsTrue(avxExecuted);
}
public void Empty_input(bool isFinalBlock)
{
var sut = new Base64Encoder();
ReadOnlySpan <T> encoded = ReadOnlySpan <T> .Empty;
Span <byte> data = new byte[sut.GetDecodedLength(encoded.Length)];
OperationStatus status = sut.DecodeCore(encoded, data, out int consumed, out int written, isFinalBlock);
Assert.AreEqual(OperationStatus.Done, status);
Assert.AreEqual(0, consumed);
Assert.AreEqual(0, written);
Assert.IsTrue(data.IsEmpty);
}
public void Guid___ssse3_event_fired()
{
var sut = new Base64Encoder();
var data = Guid.NewGuid().ToByteArray();
int encodedLength = sut.GetEncodedLength(data.Length);
Span <T> encoded = new T[encodedLength];
OperationStatus status = sut.EncodeCore(data, encoded, out int consumed, out int written);
Assume.That(status, Is.EqualTo(OperationStatus.Done));
Assume.That(consumed, Is.EqualTo(data.Length));
Assume.That(written, Is.EqualTo(encodedLength));
int decodedLength;
if (typeof(T) == typeof(byte))
{
decodedLength = sut.GetDecodedLength(MemoryMarshal.AsBytes(encoded));
}
else if (typeof(T) == typeof(char))
{
decodedLength = sut.GetDecodedLength(MemoryMarshal.Cast <T, char>(encoded));
}
else
{
throw new NotSupportedException(); // just in case new types are introduced in the future
}
Span <byte> decoded = new byte[decodedLength];
bool ssse3Executed = false;
Base64Encoder.Ssse3Decoded += (s, e) => ssse3Executed = true;
status = sut.DecodeCore <T>(encoded, decoded, out int _, out int _);
Assume.That(status, Is.EqualTo(OperationStatus.Done));
Assert.IsTrue(ssse3Executed);
}
public int EncodedLength_given___correct_decoded_length(int encodedLength)
{
var sut = new Base64Encoder();
return(sut.GetDecodedLength(encodedLength));
}
public void Data_of_various_length___roundtrips_correclty()
{
var sut = new Base64Encoder();
var bytes = new byte[byte.MaxValue + 1];
for (int i = 0; i < bytes.Length; ++i)
{
bytes[i] = (byte)(255 - i);
}
for (int i = 0; i < 256; ++i)
{
Span <byte> source = bytes.AsSpan(0, i + 1);
Span <T> encoded = new T[sut.GetEncodedLength(source.Length)];
OperationStatus status = sut.EncodeCore(source, encoded, out int consumed, out int written);
Assert.AreEqual(OperationStatus.Done, status, nameof(status) + $" at i = {i}");
Assert.AreEqual(source.Length, consumed, nameof(consumed) + $" at i = {i}");
Assert.AreEqual(encoded.Length, written, nameof(written) + $" at i = {i}");
string encodedText;
int decodedLength;
if (typeof(T) == typeof(byte))
{
Span <byte> encodedBytes = MemoryMarshal.AsBytes(encoded);
#if NETCOREAPP
encodedText = Encoding.ASCII.GetString(encodedBytes);
#else
encodedText = Encoding.ASCII.GetString(encodedBytes.ToArray());
#endif
decodedLength = sut.GetDecodedLength(encodedBytes);
}
else if (typeof(T) == typeof(char))
{
#if NETCOREAPP
encodedText = new string(MemoryMarshal.Cast <T, char>(encoded));
#else
encodedText = new string(MemoryMarshal.Cast <T, char>(encoded).ToArray());
#endif
decodedLength = sut.GetDecodedLength(encodedText.AsSpan());
}
else
{
throw new NotSupportedException(); // just in case new types are introduced in the future
}
#if NETCOREAPP
string expectedText = Convert.ToBase64String(source);
#else
string expectedText = Convert.ToBase64String(source.ToArray());
#endif
Assert.AreEqual(expectedText, encodedText);
Span <byte> decoded = new byte[decodedLength];
status = sut.DecodeCore <T>(encoded, decoded, out consumed, out written);
Assert.AreEqual(OperationStatus.Done, status);
Assert.AreEqual(encoded.Length, consumed);
Assert.AreEqual(decodedLength, written);
CollectionAssert.AreEqual(source.ToArray(), decoded.ToArray());
}
}