blob: d10ea4d12addc7e6a985db3f246065d0fbdd65be (
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
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
using System;
using System.IO;
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.Asn1
{
class DefiniteLengthInputStream
: LimitedInputStream
{
private static readonly byte[] EmptyBytes = new byte[0];
private readonly int _originalLength;
private int _remaining;
internal DefiniteLengthInputStream(Stream inStream, int length, int limit)
: base(inStream, limit)
{
if (length < 0)
throw new ArgumentException("negative lengths not allowed", "length");
this._originalLength = length;
this._remaining = length;
if (length == 0)
{
SetParentEofDetect(true);
}
}
internal int Remaining
{
get { return _remaining; }
}
public override int ReadByte()
{
if (_remaining == 0)
return -1;
int b = _in.ReadByte();
if (b < 0)
throw new EndOfStreamException("DEF length " + _originalLength + " object truncated by " + _remaining);
if (--_remaining == 0)
{
SetParentEofDetect(true);
}
return b;
}
public override int Read(
byte[] buf,
int off,
int len)
{
if (_remaining == 0)
return 0;
int toRead = System.Math.Min(len, _remaining);
int numRead = _in.Read(buf, off, toRead);
if (numRead < 1)
throw new EndOfStreamException("DEF length " + _originalLength + " object truncated by " + _remaining);
if ((_remaining -= numRead) == 0)
{
SetParentEofDetect(true);
}
return numRead;
}
internal void ReadAllIntoByteArray(byte[] buf)
{
if (_remaining != buf.Length)
throw new ArgumentException("buffer length not right for data");
if (_remaining == 0)
return;
// make sure it's safe to do this!
int limit = Limit;
if (_remaining >= limit)
throw new IOException("corrupted stream - out of bounds length found: " + _remaining + " >= " + limit);
if ((_remaining -= Streams.ReadFully(_in, buf)) != 0)
throw new EndOfStreamException("DEF length " + _originalLength + " object truncated by " + _remaining);
SetParentEofDetect(true);
}
internal byte[] ToArray()
{
if (_remaining == 0)
return EmptyBytes;
// make sure it's safe to do this!
int limit = Limit;
if (_remaining >= limit)
throw new IOException("corrupted stream - out of bounds length found: " + _remaining + " >= " + limit);
byte[] bytes = new byte[_remaining];
if ((_remaining -= Streams.ReadFully(_in, bytes)) != 0)
throw new EndOfStreamException("DEF length " + _originalLength + " object truncated by " + _remaining);
SetParentEofDetect(true);
return bytes;
}
}
}
|
