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Returns the total number of bytes of this asset entry's data. May be AssetFileDescriptor.UnknownLength if the asset extends to the end of the file. If the AssetFileDescriptor was constructed with AssetFileDescriptor.UnknownLength, this will use Android.OS.ParcelFileDescriptor.StatSize to find the total size of the file, returning that number if found or AssetFileDescriptor.UnknownLength if it could not be determined.