Ryujinx/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> _commands;
public override IReadOnlyDictionary<int, ServiceProcessRequest> Commands => _commands;
private Stream _baseStream;
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public IStorage(Stream baseStream)
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{
_commands = new Dictionary<int, ServiceProcessRequest>
{
{ 0, Read }
};
_baseStream = baseStream;
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}
// Read(u64 offset, u64 length) -> buffer<u8, 0x46, 0> buffer
public long Read(ServiceCtx context)
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{
long offset = context.RequestData.ReadInt64();
long size = context.RequestData.ReadInt64();
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if (context.Request.ReceiveBuff.Count > 0)
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{
IpcBuffDesc buffDesc = context.Request.ReceiveBuff[0];
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//Use smaller length to avoid overflows.
if (size > buffDesc.Size)
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{
size = buffDesc.Size;
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}
byte[] data = new byte[size];
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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;
}
}
}