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annotate src/ch/ethz/ssh2/SFTPInputStream.java @ 408:0c519d0acdd4 stable-1.9.0-7

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author Carl Byington <carl@five-ten-sg.com>
date Fri, 24 Oct 2014 14:27:11 -0700
parents 071eccdff8ea
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1 /*
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2 * Copyright (c) 2011 David Kocher. 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;
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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 * @version $Id: SFTPInputStream.java 151 2014-04-28 10:03:39Z dkocher@sudo.ch $
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12 */
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13 public class SFTPInputStream extends InputStream {
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14
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15 private SFTPFileHandle handle;
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16
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17 /**
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18 * Offset (in bytes) in the file to read
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19 */
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20 private long readOffset = 0;
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21
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22 public SFTPInputStream(SFTPFileHandle handle) {
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23 this.handle = handle;
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24 }
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25
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26 /**
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27 * Reads up to <code>len</code> bytes of data from the input stream into
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28 * an array of bytes. An attempt is made to read as many as
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29 * <code>len</code> bytes, but a smaller number may be read, possibly
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30 * zero. The number of bytes actually read is returned as an integer.
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31 *
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32 * @see SFTPClient#read(SFTPFileHandle, long, byte[], int, int)
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33 */
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34 @Override
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35 public int read(byte[] buffer, int offset, int len) throws IOException {
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36 int read = handle.getClient().read(handle, readOffset, buffer, offset, len);
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37
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38 if (read > 0) {
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39 readOffset += read;
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40 }
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41
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42 return read;
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43 }
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44
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45 /**
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46 * Reads the next byte of data from the input stream. The value byte is
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47 * returned as an <code>int</code> in the range <code>0</code> to
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48 * <code>255</code>. If no byte is available because the end of the stream
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49 * has been reached, the value <code>-1</code> is returned. This method
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50 * blocks until input data is available, the end of the stream is detected,
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51 * or an exception is thrown.
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52 * <p/>
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53 * <p> A subclass must provide an implementation of this method.
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54 *
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55 * @return the next byte of data, or <code>-1</code> if the end of the
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56 * stream is reached.
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57 * @throws IOException if an I/O error occurs.
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58 */
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59 @Override
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60 public int read() throws IOException {
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61 byte[] buffer = new byte[1];
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62 int b = handle.getClient().read(handle, readOffset, buffer, 0, 1);
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63
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64 if (b > 0) {
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65 readOffset += 1;
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66 }
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67
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68 return b;
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69 }
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71 /**
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72 * Skips over and discards <code>n</code> bytes of data from this input
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73 * stream.
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74 *
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75 * @param n the number of bytes to be skipped.
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76 * @return the actual number of bytes skipped.
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77 */
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78 @Override
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79 public long skip(long n) {
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80 readOffset += n;
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81 return n;
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82 }
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83
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84 @Override
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85 public void close() throws IOException {
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86 handle.getClient().closeFile(handle);
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87 }
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88 }