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2 package com.trilead.ssh2.channel;
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3
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4 import java.io.IOException;
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5 import java.io.InputStream;
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6
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7 /**
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8 * ChannelInputStream.
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9 *
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10 * @author Christian Plattner, plattner@trilead.com
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11 * @version $Id: ChannelInputStream.java,v 1.1 2007/10/15 12:49:56 cplattne Exp $
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12 */
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13 public final class ChannelInputStream extends InputStream {
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14 Channel c;
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15
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16 boolean isClosed = false;
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17 boolean isEOF = false;
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18 boolean extendedFlag = false;
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19
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20 ChannelInputStream(Channel c, boolean isExtended) {
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21 this.c = c;
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22 this.extendedFlag = isExtended;
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23 }
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24
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25 public int available() throws IOException {
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26 if (isEOF)
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27 return 0;
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28
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29 int avail = c.cm.getAvailable(c, extendedFlag);
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30 /* We must not return -1 on EOF */
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31 return (avail > 0) ? avail : 0;
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32 }
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33
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34 public void close() throws IOException {
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35 isClosed = true;
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36 }
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37
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38 public int read(byte[] b, int off, int len) throws IOException {
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39 if (b == null)
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40 throw new NullPointerException();
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41
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42 if ((off < 0) || (len < 0) || ((off + len) > b.length) || ((off + len) < 0) || (off > b.length))
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43 throw new IndexOutOfBoundsException();
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44
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45 if (len == 0)
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46 return 0;
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47
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48 if (isEOF)
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49 return -1;
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50
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51 int ret = c.cm.getChannelData(c, extendedFlag, b, off, len);
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52
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53 if (ret == -1) {
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54 isEOF = true;
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55 }
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56
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57 return ret;
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58 }
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59
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60 public int read(byte[] b) throws IOException {
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61 return read(b, 0, b.length);
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62 }
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63
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64 public int read() throws IOException {
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65 /* Yes, this stream is pure and unbuffered, a single byte read() is slow */
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66 final byte b[] = new byte[1];
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67 int ret = read(b, 0, 1);
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68
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69 if (ret != 1)
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70 return -1;
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71
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72 return b[0] & 0xff;
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73 }
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74 }
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