using System.IO;
using UnityEngine;
namespace PhxhSDK.AOT
{
    public class CustomFileStream : Stream
    {
        
        private FileStream _fileStream;
        
        public CustomFileStream(string path)
        {
            _fileStream = new FileStream(path, FileMode.Open, FileAccess.Read);
        }

        public override void Flush()
        {
            Debug.LogError("不支持Flush操作");
        }
        
        public override int Read(byte[] buffer,
            int offset,
            int count)
        {
            var read = _fileStream.Read(buffer, offset, count);
            for (int i = 0; i < read; i++)
            {
                // 取反
                var index = offset + i;
                buffer[index] = (byte)~buffer[index];
            }
            return read;
        }
        
        public override long Seek(long offset,
            SeekOrigin origin)
        {
            return _fileStream.Seek(offset, origin);
        }
        
        public override void SetLength(long value)
        {
            _fileStream.SetLength(value);
        }
        
        public override void Write(byte[] buffer,
            int offset,
            int count)
        {
            Debug.LogError("不支持Write操作");
        }
        
        public override bool CanRead
        {
            get
            {
                return _fileStream.CanRead;
            }
        }
        
        public override bool CanSeek
        {
            get
            {
                return _fileStream.CanSeek;
            }
        }
        
        public override bool CanWrite
        {
            get
            {
                return false;
            }
        }
        
        public override long Length
        {
            get
            {
                return _fileStream.Length;
            }
        }
        
        public override long Position
        {
            get
            {
                return _fileStream.Position;
            }
            set
            {
                _fileStream.Position = value;
            }
        }

        public override void Close()
        {
            base.Close();
            _fileStream.Close();
        }
        
    }
}