Source Code Cross Referenced for IndefiniteLengthInputStream.java in  » Security » Bouncy-Castle » org » bouncycastle » asn1 » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Security » Bouncy Castle » org.bouncycastle.asn1 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        package org.bouncycastle.asn1;
02:
03:        import java.io.IOException;
04:        import java.io.InputStream;
05:
06:        class IndefiniteLengthInputStream extends LimitedInputStream {
07:            private int _b1;
08:            private int _b2;
09:            private boolean _eofReached = false;
10:            private boolean _eofOn00 = true;
11:
12:            IndefiniteLengthInputStream(InputStream in) throws IOException {
13:                super (in);
14:
15:                _b1 = in.read();
16:                _b2 = in.read();
17:                _eofReached = (_b2 < 0);
18:            }
19:
20:            void setEofOn00(boolean eofOn00) {
21:                _eofOn00 = eofOn00;
22:            }
23:
24:            boolean checkForEof() {
25:                if (_eofOn00 && (_b1 == 0x00 && _b2 == 0x00)) {
26:                    _eofReached = true;
27:                    setParentEofDetect(true);
28:                }
29:                return _eofReached;
30:            }
31:
32:            public int read(byte[] b, int off, int len) throws IOException {
33:                // Only use this optimisation if we aren't checking for 00
34:                if (_eofOn00 || len < 3) {
35:                    return super .read(b, off, len);
36:                }
37:
38:                if (_eofReached) {
39:                    return -1;
40:                }
41:
42:                int numRead = _in.read(b, off + 2, len - 2);
43:
44:                if (numRead < 0) {
45:                    //          throw new EOFException();
46:                    _eofReached = true;
47:                    return -1;
48:                }
49:
50:                b[off] = (byte) _b1;
51:                b[off + 1] = (byte) _b2;
52:
53:                _b1 = _in.read();
54:                _b2 = _in.read();
55:
56:                if (_b2 < 0) {
57:                    // Corrupted stream
58:                    //            throw new EOFException();
59:                    _eofReached = true;
60:                    // Just fall thru...
61:                }
62:
63:                return numRead + 2;
64:            }
65:
66:            public int read() throws IOException {
67:                if (checkForEof()) {
68:                    return -1;
69:                }
70:
71:                int b = _in.read();
72:
73:                //
74:                // strictly speaking we should return b1 and b2, but if this happens the stream
75:                // is corrupted so we are already in trouble.
76:                //
77:                if (b < 0) {
78:                    // Corrupted stream
79:                    //            throw new EOFException();
80:                    _eofReached = true;
81:
82:                    return -1;
83:                }
84:
85:                int v = _b1;
86:
87:                _b1 = _b2;
88:                _b2 = b;
89:
90:                return v;
91:            }
92:        }
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