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using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
namespace Org.BouncyCastle.Utilities.IO
{
public static class Streams
{
private static readonly int MaxStackAlloc = Environment.Is64BitProcess ? 4096 : 1024;
public static int DefaultBufferSize => MaxStackAlloc;
public static void CopyTo(Stream source, Stream destination)
{
CopyTo(source, destination, DefaultBufferSize);
}
public static void CopyTo(Stream source, Stream destination, int bufferSize)
{
int bytesRead;
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
Span<byte> buffer = bufferSize <= MaxStackAlloc
? stackalloc byte[bufferSize]
: new byte[bufferSize];
while ((bytesRead = source.Read(buffer)) != 0)
{
destination.Write(buffer[..bytesRead]);
}
#else
byte[] buffer = new byte[bufferSize];
while ((bytesRead = source.Read(buffer, 0, buffer.Length)) != 0)
{
destination.Write(buffer, 0, bytesRead);
}
#endif
}
public static Task CopyToAsync(Stream source, Stream destination)
{
return CopyToAsync(source, destination, DefaultBufferSize);
}
public static Task CopyToAsync(Stream source, Stream destination, int bufferSize)
{
return CopyToAsync(source, destination, bufferSize, CancellationToken.None);
}
public static Task CopyToAsync(Stream source, Stream destination, CancellationToken cancellationToken)
{
return CopyToAsync(source, destination, DefaultBufferSize, cancellationToken);
}
public static async Task CopyToAsync(Stream source, Stream destination, int bufferSize,
CancellationToken cancellationToken)
{
int bytesRead;
byte[] buffer = new byte[bufferSize];
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
while ((bytesRead = await ReadAsync(source, new Memory<byte>(buffer), cancellationToken).ConfigureAwait(false)) != 0)
{
await WriteAsync(destination, new ReadOnlyMemory<byte>(buffer, 0, bytesRead), cancellationToken).ConfigureAwait(false);
}
#else
while ((bytesRead = await source.ReadAsync(buffer, 0, buffer.Length, cancellationToken).ConfigureAwait(false)) != 0)
{
await destination.WriteAsync(buffer, 0, bytesRead, cancellationToken).ConfigureAwait(false);
}
#endif
}
public static void Drain(Stream inStr)
{
CopyTo(inStr, Stream.Null, DefaultBufferSize);
}
/// <summary>Write the full contents of inStr to the destination stream outStr.</summary>
/// <param name="inStr">Source stream.</param>
/// <param name="outStr">Destination stream.</param>
/// <exception cref="IOException">In case of IO failure.</exception>
public static void PipeAll(Stream inStr, Stream outStr)
{
PipeAll(inStr, outStr, DefaultBufferSize);
}
/// <summary>Write the full contents of inStr to the destination stream outStr.</summary>
/// <param name="inStr">Source stream.</param>
/// <param name="outStr">Destination stream.</param>
/// <param name="bufferSize">The size of temporary buffer to use.</param>
/// <exception cref="IOException">In case of IO failure.</exception>
public static void PipeAll(Stream inStr, Stream outStr, int bufferSize)
{
CopyTo(inStr, outStr, bufferSize);
}
/// <summary>
/// Pipe all bytes from <c>inStr</c> to <c>outStr</c>, throwing <c>StreamFlowException</c> if greater
/// than <c>limit</c> bytes in <c>inStr</c>.
/// </summary>
/// <param name="inStr">
/// A <see cref="Stream"/>
/// </param>
/// <param name="limit">
/// A <see cref="System.Int64"/>
/// </param>
/// <param name="outStr">
/// A <see cref="Stream"/>
/// </param>
/// <returns>The number of bytes actually transferred, if not greater than <c>limit</c></returns>
/// <exception cref="IOException"></exception>
public static long PipeAllLimited(Stream inStr, long limit, Stream outStr)
{
return PipeAllLimited(inStr, limit, outStr, DefaultBufferSize);
}
public static long PipeAllLimited(Stream inStr, long limit, Stream outStr, int bufferSize)
{
var limited = new LimitedInputStream(inStr, limit);
CopyTo(limited, outStr, bufferSize);
return limit - limited.CurrentLimit;
}
public static byte[] ReadAll(Stream inStr)
{
MemoryStream buf = new MemoryStream();
PipeAll(inStr, buf);
return buf.ToArray();
}
public static byte[] ReadAll(MemoryStream inStr)
{
return inStr.ToArray();
}
public static byte[] ReadAllLimited(Stream inStr, int limit)
{
MemoryStream buf = new MemoryStream();
PipeAllLimited(inStr, limit, buf);
return buf.ToArray();
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
public static ValueTask<int> ReadAsync(Stream source, Memory<byte> buffer,
CancellationToken cancellationToken = default)
{
if (MemoryMarshal.TryGetArray(buffer, out ArraySegment<byte> array))
{
return new ValueTask<int>(
source.ReadAsync(array.Array!, array.Offset, array.Count, cancellationToken));
}
byte[] sharedBuffer = new byte[buffer.Length];
var readTask = source.ReadAsync(sharedBuffer, 0, buffer.Length, cancellationToken);
return FinishReadAsync(readTask, sharedBuffer, buffer);
}
private static async ValueTask<int> FinishReadAsync(Task<int> readTask, byte[] localBuffer,
Memory<byte> localDestination)
{
try
{
int result = await readTask.ConfigureAwait(false);
new ReadOnlySpan<byte>(localBuffer, 0, result).CopyTo(localDestination.Span);
return result;
}
finally
{
Array.Fill<byte>(localBuffer, 0x00);
}
}
#endif
public static int ReadFully(Stream inStr, byte[] buf)
{
return ReadFully(inStr, buf, 0, buf.Length);
}
public static int ReadFully(Stream inStr, byte[] buf, int off, int len)
{
int totalRead = 0;
while (totalRead < len)
{
int numRead = inStr.Read(buf, off + totalRead, len - totalRead);
if (numRead < 1)
break;
totalRead += numRead;
}
return totalRead;
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
public static int ReadFully(Stream inStr, Span<byte> buffer)
{
int totalRead = 0;
while (totalRead < buffer.Length)
{
int numRead = inStr.Read(buffer[totalRead..]);
if (numRead < 1)
break;
totalRead += numRead;
}
return totalRead;
}
#endif
public static void ValidateBufferArguments(byte[] buffer, int offset, int count)
{
if (buffer == null)
throw new ArgumentNullException("buffer");
int available = buffer.Length - offset;
if ((offset | available) < 0)
throw new ArgumentOutOfRangeException("offset");
int remaining = available - count;
if ((count | remaining) < 0)
throw new ArgumentOutOfRangeException("count");
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
public static ValueTask WriteAsync(Stream destination, ReadOnlyMemory<byte> buffer,
CancellationToken cancellationToken = default)
{
if (MemoryMarshal.TryGetArray(buffer, out ArraySegment<byte> array))
{
return new ValueTask(
destination.WriteAsync(array.Array!, array.Offset, array.Count, cancellationToken));
}
byte[] sharedBuffer = buffer.ToArray();
var writeTask = destination.WriteAsync(sharedBuffer, 0, buffer.Length, cancellationToken);
return new ValueTask(FinishWriteAsync(writeTask, sharedBuffer));
}
private static async Task FinishWriteAsync(Task writeTask, byte[] localBuffer)
{
try
{
await writeTask.ConfigureAwait(false);
}
finally
{
Array.Fill<byte>(localBuffer, 0x00);
}
}
#endif
/// <exception cref="IOException"></exception>
public static int WriteBufTo(MemoryStream buf, byte[] output, int offset)
{
#if NETCOREAPP2_0_OR_GREATER || NETSTANDARD2_1_OR_GREATER
if (buf.TryGetBuffer(out var buffer))
{
buffer.CopyTo(output, offset);
return buffer.Count;
}
#endif
int size = Convert.ToInt32(buf.Length);
buf.WriteTo(new MemoryStream(output, offset, size));
return size;
}
}
}
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