Mercurial > hg > Members > kono > jpf-core

annotate src/classes/java/io/InputStreamReader.java @ 0:61d41facf527

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initial v8 import (history reset)
author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
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1 /*
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2 * Copyright (C) 2014, United States Government, as represented by the
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3 * Administrator of the National Aeronautics and Space Administration.
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4 * All rights reserved.
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5 *
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6 * The Java Pathfinder core (jpf-core) platform is licensed under the
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7 * Apache License, Version 2.0 (the "License"); you may not use this file except
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8 * in compliance 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 java.io;
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20
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21
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22 /**
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23 * how hard can it be to transform byte(s) into a char? I hate Unicode
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24 */
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25 public class InputStreamReader extends Reader {
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26
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27 static final int BUF_SIZE=128;
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28 private static Object lock = new Object(); // our peer has state
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29
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30 InputStream in;
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31 byte[] bbuf = new byte[BUF_SIZE];
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32 String charSetName=null;
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33
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34 public InputStreamReader (InputStream in){
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35 this.in = in;
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36 }
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37
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38 public InputStreamReader (InputStream in,String charSetName){
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39 this.in = in;
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40 this.charSetName = charSetName;
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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 in.close();
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46 }
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47
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48 private native int decode (int b, boolean endOfInput);
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49
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50 @Override
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51 public boolean ready() {
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52 try {
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53 return (in.available() > 0);
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54 } catch (IOException iox){
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55 return false;
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56 }
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57 }
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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 synchronized (lock){
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62 while (true){
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63
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64 int b = in.read();
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65 if (b < 0){
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66 return -1;
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67 }
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68
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69 int c = decode(b, (in.available() == 0));
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70 if (c >= 0 ) {
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71 return c;
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72 }
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73 }
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74 }
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75 }
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76
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77
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78
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79 native int decode (byte[] inBuf,int len,
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80 char[] outBuf, int off,
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81 boolean endOfInput);
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82
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83
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84 @Override
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85 public int read (char[] cbuf, int off, int len) throws IOException {
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86 int r = 0;
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87 boolean available = true;
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88
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89 synchronized (lock){
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90 while (available && r < len){
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91 // <2do> - so what if that backtracks? the peer might have
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92 // iteration-specific state that gets lost. see native peer comments
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93 int b = in.read(bbuf, 0, Math.min(len-r,bbuf.length));
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94 if (b < 0){
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95 return (r == 0) ? -1 : r;
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96 }
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97
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98 // true if we have not reach the end of the input stream "in"
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99 // and there are still more bytes available to be read
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100 available = (in.available() > 0);
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101
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102 r += decode(bbuf,b, cbuf,off+r, !available);
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103 }
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104 }
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105
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106 return r;
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107 }
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108
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109 }