public void MultiSegmentBytesReaderNumbers()
{
ReadOnlySequence <byte> bytes = SequenceFactory.Create(new byte[][] {
new byte[] { 0 },
new byte[] { 1, 2 },
new byte[] { 3, 4 },
new byte[] { 5, 6, 7, 8 },
new byte[] { 8, 0 },
new byte[] { 1, },
new byte[] { 0, 2, },
new byte[] { 1, 2, 3, 4 },
new byte[] { 5, 6 },
new byte[] { 7, 8, 9, },
new byte[] { 0, 1, 2, 3 },
new byte[] { 4, 5 },
new byte[] { 6, 7, 8, 9 },
new byte[] { 0, 1, 2, 3 },
new byte[] { 4 },
});
SequenceReader <byte> reader = new SequenceReader <byte>(bytes);
Assert.True(reader.TryReadTo(out ReadOnlySequence <byte> bytesValue, 2));
Span <byte> span = bytesValue.ToArray();
Assert.Equal(0, span[0]);
Assert.Equal(1, span[1]);
Assert.True(reader.TryReadTo(out bytesValue, 5));
span = bytesValue.ToArray();
Assert.Equal(3, span[0]);
Assert.Equal(4, span[1]);
Assert.True(reader.TryReadTo(out bytesValue, new byte[] { 8, 8 }));
span = bytesValue.ToArray();
Assert.Equal(6, span[0]);
Assert.Equal(7, span[1]);
Assert.True(SequenceMarshal.TryRead(ref reader, out int intValue));
Assert.Equal(BitConverter.ToInt32(new byte[] { 0, 1, 0, 2 }), intValue);
Assert.True(reader.TryReadBigEndian(out intValue));
Assert.Equal(BitConverter.ToInt32(new byte[] { 4, 3, 2, 1 }), intValue);
Assert.True(reader.TryReadLittleEndian(out long longValue));
Assert.Equal(BitConverter.ToInt64(new byte[] { 5, 6, 7, 8, 9, 0, 1, 2 }), longValue);
Assert.True(reader.TryReadBigEndian(out longValue));
Assert.Equal(BitConverter.ToInt64(new byte[] { 0, 9, 8, 7, 6, 5, 4, 3 }), longValue);
Assert.True(reader.TryReadLittleEndian(out short shortValue));
Assert.Equal(BitConverter.ToInt16(new byte[] { 1, 2 }), shortValue);
Assert.True(reader.TryReadBigEndian(out shortValue));
Assert.Equal(BitConverter.ToInt16(new byte[] { 4, 3 }), shortValue);
}
public void Advance_Exception()
{
ReadOnlySequence <byte> bytes = SequenceFactory.Create(new byte[][] {
new byte[] { 0 },
new byte[] { 1, 2 },
new byte[] { 3, 4 },
new byte[] { 5, 6, 7, 8 }
});
Assert.Throws <ArgumentOutOfRangeException>(() => new SequenceReader <byte>(bytes).Advance(-1));
}
public void TryReadTo_NotFound_Sequence(bool advancePastDelimiter)
{
ReadOnlySequence <byte> bytes = SequenceFactory.Create(new byte[][] {
new byte[] { 1 },
new byte[] { 2, 3, 255 }
});
SequenceReader <byte> reader = new SequenceReader <byte>(bytes);
reader.Advance(4);
Assert.False(reader.TryReadTo(out ReadOnlySequence <byte> span, 255, 0, advancePastDelimiter));
}
public void Rewind_Exception()
{
ReadOnlySequence <byte> bytes = SequenceFactory.Create(new byte[][] {
new byte[] { 0 },
new byte[] { 1, 2 }
});
// Can't go negative
Assert.Throws <ArgumentOutOfRangeException>(() => new SequenceReader <byte>(bytes).Rewind(-1));
// Can't pull more than we consumed
Assert.Throws <ArgumentOutOfRangeException>(() => new SequenceReader <byte>(bytes).Rewind(1));
}
public void TryReadTo_Sequence(bool advancePastDelimiter, bool useEscapeOverload)
{
ReadOnlySequence <byte> bytes = SequenceFactory.Create(new byte[][] {
new byte[] { 0 },
new byte[] { 1, 2 },
new byte[] { },
new byte[] { 3, 4, 5, 6 }
});
SequenceReader <byte> reader = new SequenceReader <byte>(bytes);
// Read to 0-5
for (byte i = 0; i < bytes.Length - 1; i++)
{
SequenceReader <byte> copy = reader;
// Can read to the first integer (0-5)
Assert.True(
useEscapeOverload
? copy.TryReadTo(out ReadOnlySequence <byte> sequence, i, 255, advancePastDelimiter)
: copy.TryReadTo(out sequence, i, advancePastDelimiter));
// Should never have a null Position object
Assert.NotNull(copy.Position.GetObject());
ReadOnlySequence <byte> .Enumerator enumerator = sequence.GetEnumerator();
while (enumerator.MoveNext())
{
;
}
// Should be able to read to final 6
Assert.True(
useEscapeOverload
? copy.TryReadTo(out sequence, 6, 255, advancePastDelimiter)
: copy.TryReadTo(out sequence, 6, advancePastDelimiter));
Assert.NotNull(copy.Position.GetObject());
enumerator = sequence.GetEnumerator();
while (enumerator.MoveNext())
{
;
}
// If we didn't advance, we should still be able to read to 6
Assert.Equal(!advancePastDelimiter,
useEscapeOverload
? copy.TryReadTo(out sequence, 6, 255, advancePastDelimiter)
: copy.TryReadTo(out sequence, 6, advancePastDelimiter));
}
}
public void RewindEmptyFirstSpan()
{
// This is to hit the "if (memory.Length == 0)" branch in ResetReader.
ReadOnlySequence <byte> bytes = SequenceFactory.Create(new byte[][] {
new byte[0],
new byte[] { 1, 2 },
new byte[] { 3, 4 }
});
var reader = new SequenceReader <byte>(bytes);
reader.Advance(3);
Assert.True(reader.IsNext(4));
reader.Rewind(2);
Assert.Equal(new byte[] { 1, 2 }, reader.CurrentSpan.ToArray());
}
public void IsNext_Value()
{
ReadOnlySequence <char> chars = SequenceFactory.Create(new char[][] {
new char[] { 'A' },
new char[] { 'B', 'C' },
});
var reader = new SequenceReader <char>(chars);
Assert.False(reader.IsNext('Z', advancePast: false));
Assert.False(reader.IsNext('B', advancePast: false));
Assert.True(reader.IsNext('A', advancePast: false));
Assert.True(reader.IsNext('A', advancePast: true));
Assert.True(reader.IsNext('B', advancePast: true));
Assert.True(reader.IsNext('C', advancePast: true));
Assert.False(reader.IsNext('C', advancePast: true));
Assert.True(reader.End);
}
public void TryReadToSpan_Sequence(bool advancePastDelimiter)
{
ReadOnlySequence <byte> bytes = SequenceFactory.Create(new byte[][] {
new byte[] { 0, 0 },
new byte[] { 1, 1, 2, 2 },
new byte[] { },
new byte[] { 3, 3, 4, 4, 5, 5, 6, 6 }
});
SequenceReader <byte> baseReader = new SequenceReader <byte>(bytes);
for (byte i = 0; i < bytes.Length / 2 - 1; i++)
{
byte[] expected = new byte[i * 2 + 1];
for (int j = 0; j < expected.Length - 1; j++)
{
expected[j] = (byte)(j / 2);
}
expected[i * 2] = i;
ReadOnlySpan <byte> searchFor = new byte[] { i, (byte)(i + 1) };
SequenceReader <byte> copy = baseReader;
Assert.True(copy.TryReadTo(out ReadOnlySpan <byte> sp, searchFor, advancePastDelimiter));
Assert.True(sp.SequenceEqual(expected));
copy = baseReader;
Assert.True(copy.TryReadTo(out ReadOnlySequence <byte> seq, searchFor, advancePastDelimiter));
Assert.True(seq.ToArray().AsSpan().SequenceEqual(expected));
}
bytes = SequenceFactory.Create(new byte[][] {
new byte[] { 47, 42, 66, 32, 42, 32, 66, 42, 47 } // /*b * b*/
});
baseReader = new SequenceReader <byte>(bytes);
SequenceReader <byte> copyReader = baseReader;
Assert.True(copyReader.TryReadTo(out ReadOnlySpan <byte> span, new byte[] { 42, 47 }, advancePastDelimiter)); // */
Assert.True(span.SequenceEqual(new byte[] { 47, 42, 66, 32, 42, 32, 66 }));
copyReader = baseReader;
Assert.True(copyReader.TryReadTo(out ReadOnlySequence <byte> sequence, new byte[] { 42, 47 }, advancePastDelimiter)); // */
Assert.True(sequence.ToArray().AsSpan().SequenceEqual(new byte[] { 47, 42, 66, 32, 42, 32, 66 }));
}
public void PastEmptySegments()
{
ReadOnlySequence <byte> bytes = SequenceFactory.Create(new byte[][] {
new byte[] { 0 },
new byte[] { },
new byte[] { },
new byte[] { }
});
SequenceReader <byte> reader = new SequenceReader <byte>(bytes);
reader.Advance(1);
Assert.Equal(0, reader.CurrentSpanIndex);
Assert.Equal(0, reader.CurrentSpan.Length);
Assert.False(reader.TryPeek(out byte value));
ReadOnlySequence <byte> sequence = reader.Sequence.Slice(reader.Position);
Assert.Equal(0, sequence.Length);
}
public void TryReadTo_SingleDelimiter()
{
ReadOnlySequence <byte> bytes = SequenceFactory.Create(new byte[][] {
new byte[] { 1 },
new byte[] { 2, 3, 4, 5, 6 }
});
SequenceReader <byte> reader = new SequenceReader <byte>(bytes);
Span <byte> delimiter = new byte[] { 1 };
for (int i = 1; i < 6; i += 1)
{
// Also check scanning from the start.
SequenceReader <byte> resetReader = new SequenceReader <byte>(bytes);
delimiter[0] = (byte)i;
Assert.True(reader.TryReadTo(out ReadOnlySequence <byte> sequence, delimiter, advancePastDelimiter: true));
Assert.True(resetReader.TryReadTo(out sequence, delimiter, advancePastDelimiter: true));
Assert.True(reader.TryPeek(out byte value));
Assert.Equal(i + 1, value);
Assert.True(resetReader.TryPeek(out value));
Assert.Equal(i + 1, value);
}
}
public void TryCopyTo_Multisegment()
{
ReadOnlySequence <char> chars = SequenceFactory.Create(new char[][] {
new char[] { 'A' },
new char[] { 'B', 'C' },
new char[] { 'D', 'E', 'F' }
});
ReadOnlySpan <char> linear = new char[] { 'A', 'B', 'C', 'D', 'E', 'F' };
var reader = new SequenceReader <char>(chars);
// Something to nothing is always possible
Assert.True(reader.TryCopyTo(Span <char> .Empty));
Span <char> buffer;
// Read out ABCDEF, ABCDE, etc.
for (int i = linear.Length; i > 0; i--)
{
buffer = new char[i];
Assert.True(reader.TryCopyTo(buffer));
Assert.True(buffer.SequenceEqual(linear.Slice(0, i)));
}
buffer = new char[1];
// Read out one at a time and move through
for (int i = 0; i < linear.Length; i++)
{
Assert.True(reader.TryCopyTo(buffer));
Assert.True(reader.TryRead(out char value));
Assert.Equal(buffer[0], value);
}
// Trying to get more data than there is will fail
Assert.False(reader.TryCopyTo(new char[reader.Remaining + 1]));
}
public void IsNext_Span()
{
ReadOnlySequence <byte> bytes = SequenceFactory.Create(new byte[][] {
new byte[] { 0 },
new byte[] { 1, 2 },
new byte[] { 3, 4 },
new byte[] { 5, 6, 7, 8 }
});
var reader = new SequenceReader <byte>(bytes);
Assert.True(reader.IsNext(ReadOnlySpan <byte> .Empty, advancePast: false));
Assert.True(reader.IsNext(ReadOnlySpan <byte> .Empty, advancePast: true));
Assert.True(reader.IsNext(new byte[] { 0 }, advancePast: false));
Assert.False(reader.IsNext(new byte[] { 0, 2 }, advancePast: false));
Assert.False(reader.IsNext(new byte[] { 0, 2 }, advancePast: true));
Assert.True(reader.IsNext(new byte[] { 0, 1 }, advancePast: false));
Assert.False(reader.IsNext(new byte[] { 0, 1, 3 }, advancePast: false));
Assert.True(reader.IsNext(new byte[] { 0, 1, 2 }, advancePast: false));
Assert.False(reader.IsNext(new byte[] { 0, 1, 2, 4 }, advancePast: false));
Assert.True(reader.IsNext(new byte[] { 0, 1, 2, 3 }, advancePast: false));
Assert.True(reader.IsNext(new byte[] { 0, 1, 2, 3, 4 }, advancePast: false));
Assert.True(reader.IsNext(new byte[] { 0, 1, 2, 3, 4, 5 }, advancePast: false));
Assert.True(reader.IsNext(new byte[] { 0, 1, 2, 3, 4, 5, 6, 7, 8 }, advancePast: false));
Assert.False(reader.IsNext(new byte[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }, advancePast: false));
Assert.False(reader.IsNext(new byte[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }, advancePast: true));
Assert.Equal(0, reader.Consumed);
Assert.True(reader.IsNext(new byte[] { 0, 1, 2, 3 }, advancePast: true));
Assert.True(reader.IsNext(new byte[] { 4, 5, 6 }, advancePast: true));
Assert.True(reader.TryPeek(out byte value));
Assert.Equal(7, value);
Assert.True(reader.IsNext(new byte[] { 7, 8 }, advancePast: true));
Assert.True(reader.End);
}
public void Rewind_Exception()
{
ReadOnlySequence <byte> bytes = SequenceFactory.Create(new byte[][] {
new byte[] { 0 },
new byte[] { 1, 2 }
});
// Can't go negative
Assert.Throws <ArgumentOutOfRangeException>(() => new SequenceReader <byte>(bytes).Rewind(-1));
// Can't pull more than we consumed
SequenceReader <byte> reader = new SequenceReader <byte>(bytes);
try
{
reader.Rewind(1);
Assert.True(false, "no exception thrown");
}
catch (ArgumentOutOfRangeException)
{
// Expected
}
Assert.Equal(0, reader.Consumed);
reader.Advance(1);
try
{
reader.Rewind(2);
Assert.True(false, "no exception thrown");
}
catch (ArgumentOutOfRangeException)
{
// Expected
}
Assert.Equal(1, reader.Consumed);
}