public static void IteratingOverSegments()
{
var tempFile = Path.GetTempFileName();
var content = RandomBytes(1024);
using (var fs = new FileStream(tempFile, FileMode.Open, FileAccess.Write, FileShare.None))
{
fs.Write(content);
fs.Flush();
}
using var mappedFile = MemoryMappedFile.CreateFromFile(tempFile, FileMode.Open, null, content.Length, MemoryMappedFileAccess.Read);
using var accessor = new ReadOnlySequenceAccessor(mappedFile, 129, content.Length);
var sequence = accessor.Sequence;
Equal(content.Length, sequence.Length);
False(sequence.IsSingleSegment);
var offset = 0;
for (var position = sequence.Start; sequence.TryGet(ref position, out var block) && !block.IsEmpty; offset += block.Length)
{
True(block.Length <= 129);
True(new ReadOnlySpan <byte>(content, offset, block.Length).SequenceEqual(block.Span));
}
}
internal static void AddSegment(ReadOnlySequenceAccessor cursor, int length, ref MappedSegment?first, ref MappedSegment?last)
{
if (first is null || last is null)
{
first = last = new MappedSegment(cursor, length)
{
RunningIndex = 0L
}
}
;
public static void ContentEquality()
{
var tempFile = Path.GetTempFileName();
var content = new byte[1024];
new Random().NextBytes(content);
using (var fs = new FileStream(tempFile, FileMode.Open, FileAccess.Write, FileShare.None))
{
fs.Write(content);
}
using var mappedFile = MemoryMappedFile.CreateFromFile(tempFile, FileMode.Open, null, content.Length, MemoryMappedFileAccess.Read);
using var accessor = new ReadOnlySequenceAccessor(mappedFile, 129, content.Length);
var sequence = accessor.Sequence;
Equal(content.Length, sequence.Length);
False(sequence.IsSingleSegment);
Equal(content, sequence.ToArray());
}
private MappedSegment(ReadOnlySequenceAccessor cursor, int length)
: this(cursor, new Segment(0L, length))
{
}
private MappedSegment(ReadOnlySequenceAccessor cursor, Segment segment)
{
manager = new MemoryManager(cursor, segment);
Memory = manager.Memory;
}
internal MemoryManager(ReadOnlySequenceAccessor cursor, Segment segment)
{
Cursor = cursor;
Segment = segment;
}