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annotate src/ch/ethz/ssh2/channel/ChannelInputStream.java @ 273:91a31873c42a ganymed

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start conversion from trilead to ganymed
author Carl Byington <carl@five-ten-sg.com>
date Fri, 18 Jul 2014 11:21:46 -0700
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children 071eccdff8ea
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1 /*
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2 * Copyright (c) 2006-2011 Christian Plattner. All rights reserved.
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3 * Please refer to the LICENSE.txt for licensing details.
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4 */
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5 package ch.ethz.ssh2.channel;
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6
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7 import java.io.IOException;
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8 import java.io.InputStream;
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9
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10 /**
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11 * ChannelInputStream.
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12 *
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13 * @author Christian Plattner
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14 * @version 2.50, 03/15/10
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15 */
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16 public final class ChannelInputStream extends InputStream
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17 {
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18 Channel c;
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19
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20 boolean isClosed = false;
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21 boolean isEOF = false;
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22 boolean extendedFlag = false;
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23
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24 ChannelInputStream(Channel c, boolean isExtended)
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25 {
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26 this.c = c;
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27 this.extendedFlag = isExtended;
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28 }
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29
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30 @Override
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31 public int available() throws IOException
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32 {
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33 if (isEOF)
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34 return 0;
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35
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36 int avail = c.cm.getAvailable(c, extendedFlag);
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37
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38 /* We must not return -1 on EOF */
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39
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40 return (avail > 0) ? avail : 0;
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41 }
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42
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43 @Override
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44 public void close() throws IOException
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45 {
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46 isClosed = true;
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47 }
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48
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49 @Override
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50 public int read(byte[] b, int off, int len) throws IOException
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51 {
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52 if (b == null)
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53 throw new NullPointerException();
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54
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55 if ((off < 0) || (len < 0) || ((off + len) > b.length) || ((off + len) < 0) || (off > b.length))
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56 throw new IndexOutOfBoundsException();
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57
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58 if (len == 0)
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59 return 0;
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60
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61 if (isEOF)
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62 return -1;
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63
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64 int ret = c.cm.getChannelData(c, extendedFlag, b, off, len);
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65
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66 if (ret == -1)
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67 {
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68 isEOF = true;
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69 }
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70
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71 return ret;
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72 }
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73
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74 @Override
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75 public int read(byte[] b) throws IOException
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76 {
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77 return read(b, 0, b.length);
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78 }
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79
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80 @Override
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81 public int read() throws IOException
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82 {
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83 /* Yes, this stream is pure and unbuffered, a single byte read() is slow */
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84
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85 final byte b[] = new byte[1];
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86
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87 int ret = read(b, 0, 1);
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88
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89 if (ret != 1)
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90 return -1;
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91
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92 return b[0] & 0xff;
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93 }
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94 }