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[Wip] Add an implementation of ReadAsync to PartialInputStream #589

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[Wip] Add an implementation of ReadAsync to PartialInputStream #589

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31 changes: 31 additions & 0 deletions src/ICSharpCode.SharpZipLib/Zip/ZipFile.cs
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Expand Up @@ -9,6 +9,8 @@
using System.IO;
using System.Security.Cryptography;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace ICSharpCode.SharpZipLib.Zip
{
Expand Down Expand Up @@ -4223,6 +4225,35 @@ public override int Read(byte[] buffer, int offset, int count)
}
}

///<inheritdoc/>
public override async Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
// lock (baseStream_)
{
if (count > end_ - readPos_)
{
count = (int)(end_ - readPos_);
if (count == 0)
{
return 0;
}
}
// Protect against Stream implementations that throw away their buffer on every Seek
// (for example, Mono FileStream)
if (baseStream_.Position != readPos_)
{
baseStream_.Seek(readPos_, SeekOrigin.Begin);
}

int readCount = await baseStream_.ReadAsync(buffer, offset, count, cancellationToken);
if (readCount > 0)
{
readPos_ += readCount;
}
return readCount;
}
}

/// <summary>
/// Writes a sequence of bytes to the current stream and advances the current position within this stream by the number of bytes written.
/// </summary>
Expand Down