/// <summary>
/// Forms a slice out of the given <see cref="ReadableBuffer"/>, beginning at 'start', and is at most length bytes
/// </summary>
/// <param name="start">The index at which to begin this slice.</param>
/// <param name="length">The length of the slice</param>
public ReadableBuffer Slice(int start, int length)
{
var begin = BufferStart.Seek(start, BufferEnd, false);
var end = begin.Seek(length, BufferEnd, false);
return(Slice(begin, end));
}
/// <summary>
/// Forms a slice out of the given <see cref="ReadableBuffer"/>, beginning at 'start', and is at most length bytes
/// </summary>
/// <param name="start">The index at which to begin this slice.</param>
/// <param name="length">The length of the slice</param>
public ReadableBuffer Slice(long start, long length)
{
var begin = BufferStart.Seek(start, BufferEnd, false);
var end = begin.Seek(length, BufferEnd, false);
return(new ReadableBuffer(begin, end));
}
public ReadCursor Move(ReadCursor cursor, int count)
{
if (count < 0)
{
throw new ArgumentOutOfRangeException(nameof(count));
}
return(cursor.Seek(count, BufferEnd, false));
}
/// <summary>
/// Forms a slice out of the given <see cref="ReadableBuffer"/>, beginning at 'start', and is at most length bytes
/// </summary>
/// <param name="start">The starting (inclusive) <see cref="ReadCursor"/> at which to begin this slice.</param>
/// <param name="length">The length of the slice</param>
public ReadableBuffer Slice(ReadCursor start, int length)
{
BufferEnd.BoundsCheck(start);
var end = start.Seek(length, BufferEnd, false);
return(Slice(start, end));
}
public ReadCursor Move(ReadCursor cursor, int count)
{
if (count < 0)
{
throw new ArgumentOutOfRangeException(nameof(count));
}
var newCursor = cursor.Seek(count, _end);
return(newCursor);
}
/// <summary>
/// Forms a slice out of the given <see cref="ReadableBuffer"/>, beginning at 'start', and is at most length bytes
/// </summary>
/// <param name="start">The starting (inclusive) <see cref="ReadCursor"/> at which to begin this slice.</param>
/// <param name="length">The length of the slice</param>
public ReadableBuffer Slice(ReadCursor start, int length)
{
return(Slice(start, start.Seek(length)));
}
/// <summary>
/// Searches for a byte in the <see cref="ReadableBuffer"/> and returns a sliced <see cref="ReadableBuffer"/> that
/// contains all data up to and excluding the byte, and a <see cref="ReadCursor"/> that points to the byte.
/// </summary>
/// <param name="b1">The first byte to search for</param>
/// <param name="slice">A <see cref="ReadableBuffer"/> slice that contains all data up to and excluding the first byte.</param>
/// <param name="cursor">A <see cref="ReadCursor"/> that points to the second byte</param>
/// <returns>True if the byte sequence was found, false if not found</returns>
public bool TrySliceTo(byte b1, out ReadableBuffer slice, out ReadCursor cursor)
{
if (IsEmpty)
{
slice = default(ReadableBuffer);
cursor = default(ReadCursor);
return(false);
}
var byte0Vector = CommonVectors.GetVector(b1);
var seek = 0;
foreach (var memory in this)
{
var currentSpan = memory.Span;
var found = false;
if (Vector.IsHardwareAccelerated)
{
while (currentSpan.Length >= VectorWidth)
{
var data = currentSpan.Read <Vector <byte> >();
var byte0Equals = Vector.Equals(data, byte0Vector);
if (byte0Equals.Equals(Vector <byte> .Zero))
{
currentSpan = currentSpan.Slice(VectorWidth);
seek += VectorWidth;
}
else
{
var index = FindFirstEqualByte(ref byte0Equals);
seek += index;
found = true;
break;
}
}
}
if (!found)
{
// Slow search
for (int i = 0; i < currentSpan.Length; i++)
{
if (currentSpan[i] == b1)
{
found = true;
break;
}
seek++;
}
}
if (found)
{
cursor = _start.Seek(seek);
slice = Slice(_start, cursor);
return(true);
}
}
slice = default(ReadableBuffer);
cursor = default(ReadCursor);
return(false);
}