R/Ryujinx.HLE/HOS/Services/FspSrv/IStorage.cs

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using Ryujinx.HLE.HOS.Ipc;
using System.Collections.Generic;
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using System.IO;
namespace Ryujinx.HLE.HOS.Services.FspSrv
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{
class IStorage : IpcService
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{
private Dictionary<int, ServiceProcessRequest> m_Commands;
public override IReadOnlyDictionary<int, ServiceProcessRequest> Commands => m_Commands;
private Stream BaseStream;
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public IStorage(Stream BaseStream)
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{
m_Commands = new Dictionary<int, ServiceProcessRequest>()
{
{ 0, Read }
};
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this.BaseStream = BaseStream;
}
public long Read(ServiceCtx Context)
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{
long Offset = Context.RequestData.ReadInt64();
long Size = Context.RequestData.ReadInt64();
if (Context.Request.ReceiveBuff.Count > 0)
{
IpcBuffDesc BuffDesc = Context.Request.ReceiveBuff[0];
//Use smaller length to avoid overflows.
if (Size > BuffDesc.Size)
{
Size = BuffDesc.Size;
}
byte[] Data = new byte[Size];
lock (BaseStream)
{
BaseStream.Seek(Offset, SeekOrigin.Begin);
BaseStream.Read(Data, 0, Data.Length);
}
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Context.Memory.WriteBytes(BuffDesc.Position, Data);
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}
return 0;
}
}
}