javaunohelper/com/sun/star/lib/uno/adapter/ByteArrayToXInputStreamAdapter.java

   1 /*
   2  * This file is part of the LibreOffice project.
   3  *
   4  * This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   7  *
   8  * This file incorporates work covered by the following license notice:
   9  *
  10  *   Licensed to the Apache Software Foundation (ASF) under one or more
  11  *   contributor license agreements. See the NOTICE file distributed
  12  *   with this work for additional information regarding copyright
  13  *   ownership. The ASF licenses this file to you under the Apache
  14  *   License, Version 2.0 (the "License"); you may not use this file
  15  *   except in compliance with the License. You may obtain a copy of
  16  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  17  */
  18 package com.sun.star.lib.uno.adapter;
  19
  20 import com.sun.star.io.XInputStream;
  21 import com.sun.star.io.XSeekable;
  22 import  com.sun.star.lib.uno.helper.ComponentBase;
  23
  24 public final class ByteArrayToXInputStreamAdapter
  25     extends ComponentBase
  26     implements XInputStream, XSeekable
  27 {
  28
  29     byte[] m_bytes;
  30     int m_length;
  31     int m_pos;
  32
  33     boolean m_open;
  34
  35     /** Creates a new instance of ByteArrayXInputStram */
  36     public ByteArrayToXInputStreamAdapter(byte[] bytes) {
  37         init(bytes);
  38     }
  39
  40     public void init(byte[] bytes) {
  41         m_bytes = bytes;
  42         m_length = bytes.length;
  43         m_pos = 0;
  44         m_open = true;
  45     }
  46
  47     private void _check() throws com.sun.star.io.NotConnectedException, com.sun.star.io.IOException {
  48         if (m_bytes == null) {
  49             throw new com.sun.star.io.NotConnectedException("no bytes");
  50         }
  51         if(!m_open) {
  52             throw new com.sun.star.io.IOException("input closed");
  53         }
  54     }
  55
  56     public int available() throws com.sun.star.io.NotConnectedException, com.sun.star.io.IOException {
  57         _check();
  58         long a = m_length - m_pos;
  59         if (a != (int)a)
  60             throw new com.sun.star.io.IOException("integer overflow");
  61         else {
  62             return (int)a;
  63         }
  64     }
  65
  66     public void closeInput() throws com.sun.star.io.NotConnectedException, com.sun.star.io.IOException {
  67         _check();
  68         m_open = false;
  69     }
  70
  71     public int readBytes(byte[][] values, int param) throws com.sun.star.io.NotConnectedException, com.sun.star.io.BufferSizeExceededException, com.sun.star.io.IOException {
  72         _check();
  73     try {
  74             int remain = (m_length - m_pos);
  75             if (param > remain) param = remain;
  76             /* ARGH!!! */
  77             if (values[0] == null){
  78                 values[0] = new byte[param];
  79             }
  80             System.arraycopy(m_bytes, m_pos, values[0], 0, param);
  81             m_pos += param;
  82             return param;
  83         } catch (ArrayIndexOutOfBoundsException ex) {
  84             throw new com.sun.star.io.BufferSizeExceededException(ex, "buffer overflow");
  85         } catch (Exception ex) {
  86             throw new com.sun.star.io.IOException(ex, "error accessing buffer");
  87         }
  88     }
  89
  90     public int readSomeBytes(byte[][] values, int param) throws com.sun.star.io.NotConnectedException, com.sun.star.io.BufferSizeExceededException, com.sun.star.io.IOException {
  91         return readBytes(values, param);
  92     }
  93
  94     public void skipBytes(int param) throws com.sun.star.io.NotConnectedException, com.sun.star.io.BufferSizeExceededException, com.sun.star.io.IOException {
  95         _check();
  96         if (param > (m_length - m_pos))
  97             throw new com.sun.star.io.BufferSizeExceededException("buffer overflow");
  98         m_pos += param;
  99     }
 100
 101     public long getLength() throws com.sun.star.io.IOException {
 102         if (m_bytes != null) return m_length;
 103         else throw new com.sun.star.io.IOException("no bytes");
 104     }
 105
 106     public long getPosition() throws com.sun.star.io.IOException {
 107         if (m_bytes != null) return m_pos;
 108         else throw new com.sun.star.io.IOException("no bytes");
 109     }
 110
 111     public void seek(long param) throws com.sun.star.lang.IllegalArgumentException, com.sun.star.io.IOException {
 112         if (m_bytes != null){
 113             if (param < 0 || param > m_length) throw new com.sun.star.lang.IllegalArgumentException("invalid seek position");
 114             else m_pos = (int)param;
 115         }else throw new com.sun.star.io.IOException("no bytes");
 116     }
 117 }