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AndroidAssetStream.cs
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AndroidAssetStream.cs
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using UnityEngine;
using System;
#if UNITY_ANDROID
namespace X
{
public class AndroidAssetStream : System.IO.Stream
{
AndroidJavaObject AndroidInputStream;
long AndroidInputStreamLength = long.MaxValue;
long AndroidInputStreamPostion = 0;
public AndroidAssetStream(string fileName)
{
var noCompressExt = new string[]{
".jpg", ".jpeg", ".png", ".gif",
".wav", ".mp2", ".mp3", ".ogg", ".aac",
".mpg", ".mpeg", ".mid", ".midi", ".smf", ".jet",
".rtttl", ".imy", ".xmf", ".mp4", ".m4a",
".m4v", ".3gp", ".3gpp", ".3g2", ".3gpp2",
".amr", ".awb", ".wma", ".wmv"
};
var ext = System.IO.Path.GetExtension(fileName);
using (var unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
{
using (var activity = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity"))
{
using (var assetManager = activity.Call<AndroidJavaObject>("getAssets")) //android.content.res.AssetManager
{
if (Array.Exists<string>(noCompressExt, (obj)=>{ return obj == ext; }))
{
using (var assetFileDescriptor = assetManager.Call<AndroidJavaObject>("openFd", fileName)) //assets/ //android.content.res.AssetFileDescriptor
{
AndroidInputStreamLength = assetFileDescriptor.Call<long>("getLength");
}
}
AndroidInputStream = assetManager.Call<AndroidJavaObject>("open", fileName);
}
}
}
if (AndroidInputStream == null)
throw new System.IO.FileNotFoundException("getAssets failed", fileName);
}
public override void Flush ()
{
throw new NotImplementedException();
}
public override int Read(byte[] buffer, int offset, int count)
{
var ret = Read(AndroidInputStream, buffer, offset, count);
if (ret > 0)
AndroidInputStreamPostion += ret;
return ret;
}
public override long Seek(long offset, System.IO.SeekOrigin origin)
{
if (offset - AndroidInputStreamPostion < 0)
throw new NotImplementedException();
long skip;
switch (origin)
{
case System.IO.SeekOrigin.Begin:
skip = AndroidInputStream.Call<long>("skip", offset - AndroidInputStreamPostion);
AndroidInputStreamPostion += skip;
break;
case System.IO.SeekOrigin.Current:
skip = AndroidInputStream.Call<long>("skip", offset);
AndroidInputStreamPostion += skip;
break;
case System.IO.SeekOrigin.End:
throw new NotImplementedException();
}
return AndroidInputStreamPostion;
}
public override void SetLength(long value)
{
throw new NotImplementedException();
}
public override void Write(byte[] buffer, int offset, int count)
{
throw new NotImplementedException();
}
public override bool CanRead
{
get
{
return AndroidInputStream != null;
}
}
public override bool CanSeek
{
get
{
return false;
}
}
public override bool CanWrite
{
get
{
return false;
}
}
public override long Length
{
get
{
if (AndroidInputStreamLength == long.MaxValue)
throw new NotImplementedException();
return AndroidInputStreamLength;
}
}
public override long Position
{
get
{
return AndroidInputStreamPostion;
}
set
{
throw new NotImplementedException();
}
}
int Read(AndroidJavaObject javaObject, byte[] buffer, int offset, int count)
{
var args = new object[]{buffer, offset, count};
IntPtr methodID = AndroidJNIHelper.GetMethodID<int>(javaObject.GetRawClass(), "read", args, false);
jvalue[] array = AndroidJNIHelper.CreateJNIArgArray(args);
try
{
var readLen = AndroidJNI.CallIntMethod(javaObject.GetRawObject(), methodID, array);
if (readLen > 0)
{
var temp = AndroidJNI.FromByteArray(array[0].l);
Array.Copy(temp, offset, buffer, offset, readLen);
}
return readLen;
}
finally
{
AndroidJNIHelper.DeleteJNIArgArray(args, array);
}
}
}
}
#endif