01: /*
02: * <copyright>
03: *
04: * Copyright 1997-2004 BBNT Solutions, LLC
05: * under sponsorship of the Defense Advanced Research Projects
06: * Agency (DARPA).
07: *
08: * You can redistribute this software and/or modify it under the
09: * terms of the Cougaar Open Source License as published on the
10: * Cougaar Open Source Website (www.cougaar.org).
11: *
12: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
13: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
14: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
15: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
16: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
17: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
18: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
22: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23: *
24: * </copyright>
25: */
26:
27: package org.cougaar.core.persist;
28:
29: import java.io.FilterInputStream;
30: import java.io.IOException;
31: import java.io.InputStream;
32:
33: import org.cougaar.core.service.DataProtectionKey;
34:
35: /**
36: * A trivial {@link InputStream} for testing the {@link
37: * org.cougaar.core.service.DataProtectionService}.
38: *
39: * @see DataProtectionOutputStreamStub
40: */
41: public class DataProtectionInputStreamStub extends FilterInputStream {
42: private DataProtectionKeyStub keyStub;
43: // Our own buffer so we don't pollute the callers buffers.
44: private byte[] buf = new byte[8192];
45:
46: public DataProtectionInputStreamStub(InputStream s,
47: DataProtectionKey keyStub) {
48: super (s);
49: this .keyStub = (DataProtectionKeyStub) keyStub;
50: }
51:
52: public int read() throws IOException {
53: int b = super .read();
54: if (b < 0)
55: return b;
56: return (b ^ keyStub.xor) & 0xff;
57: }
58:
59: public int read(byte[] b) throws IOException {
60: return read(b, 0, b.length);
61: }
62:
63: public int read(byte[] b, int offset, int nb) throws IOException {
64: int total = -1;
65: byte xor = keyStub.xor;
66: while (nb > 0) {
67: int tnb = Math.min(nb, buf.length);
68: tnb = super .read(buf, 0, tnb);
69: if (tnb < 0)
70: break;
71: for (int i = 0; i < tnb; i++) {
72: b[offset + i] = (byte) (buf[i] ^ xor);
73: }
74: offset += tnb;
75: nb -= tnb;
76: if (total < 0) {
77: total = tnb;
78: } else {
79: total += tnb;
80: }
81: }
82: return total;
83: }
84:
85: public String toString() {
86: return "DataProtectionInputStreamStub key " + keyStub;
87: }
88: }
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