[英]How to copy Memory<byte> to a specific offset in byte[]
I am using async network IO, my read buffer is in Memory , I am trying to copy the Memory into a byte[] at a specific offset.我正在使用异步网络 IO,我的读取缓冲区位于Memory中,我正在尝试将Memory复制到特定偏移量的字节 []中。
public bool Append(Memory<byte> buffer)
{
// Verify input data
if (buffer.Length <= 0 ||
buffer.Length > PacketSize - Received)
{
// Debug.Assert(false);
return false;
}
// Copy received data into packet at current offset
// TODO : Avoid heap array allocation or iteration
//Buffer.BlockCopy(buffer.ToArray(), 0, Packet, Received, buffer.Length);
//private readonly byte[] Packet;
for (int i = 0; i < buffer.Length; i ++)
{
Packet[Received + i] = buffer.Span[i];
}
Received += buffer.Length;
// If we have a header it must match
if (HasHeader() && !DoesHeaderMatch())
{
// Debug.Assert(false);
return false;
}
return true;
}
I am looking for an equivalent of Buffer.BlockCopy()
, but the memory source should be of type Memory<>
or derived Span<>
type.我正在寻找等效的Buffer.BlockCopy()
,但 memory 源应该是Memory<>
类型或派生Span<>
类型。 I do not want to create temporary stack or heap buffers.我不想创建临时堆栈或堆缓冲区。
Any ideas?有任何想法吗?
Solution:解决方案:
// Copy received data into packet at current offset
Span<byte> destination = Packet.AsSpan().Slice(Received, buffer.Length);
Span<byte> source = buffer.Span;
source.CopyTo(destination);
Received += buffer.Length;
Hopefully I'm getting what you're saying..希望我能明白你在说什么。。
So you have a buffer, Packet, and you're happy to make it a span.所以你有一个缓冲区,Packet,你很高兴把它变成一个跨度。 And it has some data in like Hello World:它有一些数据,比如 Hello World:
byte[] buf = Encoding.ASCII.GetBytes("Hello World");
var bufSpan = buf.AsSpan();
And you have some other data as another span:你还有一些其他数据作为另一个跨度:
byte[] otherSpan = Encoding.ASCII.GetBytes("rr").AsSpan();
And you want to write that data into the buffer at a certain location.并且您想将该数据写入缓冲区的某个位置。 You have to slice the buffer first and copy the new data into the Span created by the slice您必须先对缓冲区进行切片并将新数据复制到切片创建的 Span 中
otherSpan.CopyTo(bufSpan.Slice(2)); //replace the ll with rr
Console.WriteLine(Encoding.ASCII.GetString(bufSpan.ToArray()));
prints "Herro World"打印“英雄世界”
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