summary refs log tree commit diff
path: root/crypto/src/util/io/BaseInputStream.cs
blob: 0a6e1930709491f5063acfd8e4d683edc3677bcd (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
using System;
using System.Diagnostics;
using System.IO;

namespace Org.BouncyCastle.Utilities.IO
{
    public abstract class BaseInputStream : Stream
    {
		private bool closed;

		public sealed override bool CanRead { get { return !closed; } }
        public sealed override bool CanSeek { get { return false; } }
        public sealed override bool CanWrite { get { return false; } }

#if PORTABLE
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                closed = true;
            }
            base.Dispose(disposing);
        }
#else
		public override void Close()
        {
            closed = true;
        }
#endif

        public sealed override void Flush() {}
        public sealed override long Length { get { throw new NotSupportedException(); } }
        public sealed override long Position
        {
            get { throw new NotSupportedException(); }
            set { throw new NotSupportedException(); }
        }

        public override int Read(byte[] buffer, int offset, int count)
        {
            int pos = offset;
            try
            {
                int end = offset + count;
                while (pos < end)
                {
                    int b = ReadByte();
                    if (b == -1) break;
                    buffer[pos++] = (byte) b;
                }
            }
            catch (IOException)
            {
                if (pos == offset) throw;
            }
            return pos - offset;
        }

        public sealed override long Seek(long offset, SeekOrigin origin) { throw new NotSupportedException(); }
        public sealed override void SetLength(long value) { throw new NotSupportedException(); }
        public sealed override void Write(byte[] buffer, int offset, int count) { throw new NotSupportedException(); }
    }
}