1 | /* |
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2 | * Licensed to the Apache Software Foundation (ASF) under one |
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3 | * or more contributor license agreements. See the NOTICE file |
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4 | * distributed with this work for additional information |
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5 | * regarding copyright ownership. The ASF licenses this file |
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6 | * to you under the Apache License, Version 2.0 (the |
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7 | * "License"); you may not use this file except in compliance |
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8 | * with the License. You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | |
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19 | package org.apache.hadoop.io.compress; |
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20 | |
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21 | import java.io.IOException; |
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22 | import java.io.OutputStream; |
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23 | |
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24 | import org.apache.hadoop.io.compress.CompressionOutputStream; |
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25 | import org.apache.hadoop.io.compress.Compressor; |
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26 | |
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27 | public class CompressorStream extends CompressionOutputStream { |
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28 | protected Compressor compressor; |
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29 | protected byte[] buffer; |
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30 | protected boolean closed = false; |
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31 | |
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32 | public CompressorStream(OutputStream out, Compressor compressor, int bufferSize) { |
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33 | super(out); |
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34 | |
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35 | if (out == null || compressor == null) { |
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36 | throw new NullPointerException(); |
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37 | } else if (bufferSize <= 0) { |
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38 | throw new IllegalArgumentException("Illegal bufferSize"); |
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39 | } |
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40 | |
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41 | this.compressor = compressor; |
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42 | buffer = new byte[bufferSize]; |
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43 | } |
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44 | |
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45 | public CompressorStream(OutputStream out, Compressor compressor) { |
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46 | this(out, compressor, 512); |
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47 | } |
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48 | |
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49 | /** |
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50 | * Allow derived classes to directly set the underlying stream. |
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51 | * |
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52 | * @param out Underlying output stream. |
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53 | */ |
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54 | protected CompressorStream(OutputStream out) { |
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55 | super(out); |
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56 | } |
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57 | |
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58 | public void write(byte[] b, int off, int len) throws IOException { |
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59 | // Sanity checks |
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60 | if (compressor.finished()) { |
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61 | throw new IOException("write beyond end of stream"); |
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62 | } |
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63 | if ((off | len | (off + len) | (b.length - (off + len))) < 0) { |
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64 | throw new IndexOutOfBoundsException(); |
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65 | } else if (len == 0) { |
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66 | return; |
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67 | } |
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68 | |
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69 | compressor.setInput(b, off, len); |
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70 | while (!compressor.needsInput()) { |
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71 | compress(); |
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72 | } |
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73 | } |
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74 | |
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75 | protected void compress() throws IOException { |
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76 | int len = compressor.compress(buffer, 0, buffer.length); |
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77 | if (len > 0) { |
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78 | out.write(buffer, 0, len); |
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79 | } |
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80 | } |
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81 | |
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82 | public void finish() throws IOException { |
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83 | if (!compressor.finished()) { |
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84 | compressor.finish(); |
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85 | while (!compressor.finished()) { |
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86 | compress(); |
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87 | } |
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88 | } |
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89 | } |
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90 | |
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91 | public void resetState() throws IOException { |
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92 | compressor.reset(); |
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93 | } |
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94 | |
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95 | public void close() throws IOException { |
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96 | if (!closed) { |
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97 | finish(); |
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98 | out.close(); |
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99 | closed = true; |
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100 | } |
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101 | } |
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102 | |
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103 | private byte[] oneByte = new byte[1]; |
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104 | public void write(int b) throws IOException { |
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105 | oneByte[0] = (byte)(b & 0xff); |
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106 | write(oneByte, 0, oneByte.length); |
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107 | } |
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108 | |
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109 | } |
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