package/source/zipapi/MemoryByteGrabber.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
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   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19 #ifndef INCLUDED_PACKAGE_SOURCE_ZIPAPI_MEMORYBYTEGRABBER_HXX
  20 #define INCLUDED_PACKAGE_SOURCE_ZIPAPI_MEMORYBYTEGRABBER_HXX
  21
  22 #include <com/sun/star/io/XInputStream.hpp>
  23 #include <com/sun/star/io/XSeekable.hpp>
  24 #include <string.h>
  25
  26 class MemoryByteGrabber
  27 {
  28 protected:
  29     const com::sun::star::uno::Sequence < sal_Int8 > maBuffer;
  30     const sal_Int8 *mpBuffer;
  31     sal_Int32 mnCurrent, mnEnd;
  32 public:
  33     MemoryByteGrabber ( const com::sun::star::uno::Sequence < sal_Int8 > & rBuffer )
  34     : maBuffer ( rBuffer )
  35     , mpBuffer ( rBuffer.getConstArray() )
  36     , mnCurrent ( 0 )
  37     , mnEnd ( rBuffer.getLength() )
  38     {
  39     }
  40     MemoryByteGrabber()
  41     {
  42     }
  43     const sal_Int8 * getCurrentPos () { return mpBuffer + mnCurrent; }
  44
  45     // XInputStream chained
  46     sal_Int32 SAL_CALL readBytes( com::sun::star::uno::Sequence< sal_Int8 >& aData,
  47                                             sal_Int32 nBytesToRead )
  48         throw(com::sun::star::io::NotConnectedException, com::sun::star::io::BufferSizeExceededException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
  49     {
  50         if ( nBytesToRead < 0)
  51             throw com::sun::star::io::BufferSizeExceededException();
  52
  53         if (nBytesToRead + mnCurrent > mnEnd)
  54             nBytesToRead = mnEnd - mnCurrent;
  55
  56         aData.realloc ( nBytesToRead );
  57         memcpy( aData.getArray(), mpBuffer + mnCurrent, nBytesToRead );
  58         mnCurrent += nBytesToRead;
  59         return nBytesToRead;
  60     }
  61
  62     sal_Int32 SAL_CALL readSomeBytes( com::sun::star::uno::Sequence< sal_Int8 >& aData,
  63                                                     sal_Int32 nMaxBytesToRead )
  64         throw(com::sun::star::io::NotConnectedException, com::sun::star::io::BufferSizeExceededException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
  65     {
  66         return readBytes( aData, nMaxBytesToRead );
  67     }
  68     void SAL_CALL skipBytes( sal_Int32 nBytesToSkip )
  69         throw(com::sun::star::io::NotConnectedException, com::sun::star::io::BufferSizeExceededException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
  70     {
  71         mnCurrent += nBytesToSkip;
  72     }
  73     sal_Int32 SAL_CALL available(  )
  74         throw(com::sun::star::io::NotConnectedException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
  75     {
  76         return mnEnd - mnCurrent;
  77     }
  78
  79     // XSeekable chained...
  80     sal_Int64 SAL_CALL seek( sal_Int64 location )
  81         throw(com::sun::star::lang::IllegalArgumentException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
  82     {
  83         if ( location < 0 || location > mnEnd )
  84             throw com::sun::star::lang::IllegalArgumentException ();
  85         mnCurrent = static_cast < sal_Int32 > ( location );
  86         return mnCurrent;
  87     }
  88     sal_Int64 SAL_CALL getPosition(  )
  89             throw(com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
  90     {
  91         return mnCurrent;
  92     }
  93     sal_Int64 SAL_CALL getLength(  )
  94             throw(com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
  95     {
  96         return mnEnd;
  97     }
  98     sal_Int8 ReadInt8()
  99     {
 100         if (mnCurrent + 1 > mnEnd )
 101             return 0;
 102         return mpBuffer [mnCurrent++] & 0xFF;
 103     }
 104     sal_Int16 ReadInt16()
 105     {
 106         if (mnCurrent + 2 > mnEnd )
 107             return 0;
 108         sal_Int16 nInt16  =   mpBuffer[mnCurrent++] & 0xFF;
 109         nInt16 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;
 110         return nInt16;
 111     }
 112     sal_Int32 ReadInt32()
 113     {
 114         if (mnCurrent + 4 > mnEnd )
 115             return 0;
 116
 117         sal_Int32 nInt32  =   mpBuffer[mnCurrent++] & 0xFF;
 118         nInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;
 119         nInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 16;
 120         nInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 24;
 121         return nInt32;
 122     }
 123
 124     sal_uInt8 ReadUInt8()
 125     {
 126         if (mnCurrent + 1 > mnEnd )
 127             return 0;
 128         return mpBuffer [mnCurrent++] & 0xFF;
 129     }
 130     sal_uInt16 ReadUInt16()
 131     {
 132         if (mnCurrent + 2 > mnEnd )
 133             return 0;
 134
 135         sal_uInt16 nInt16  =   mpBuffer [mnCurrent++] & 0xFF;
 136         nInt16 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 8;
 137         return nInt16;
 138     }
 139     sal_uInt32 ReadUInt32()
 140     {
 141         if (mnCurrent + 4 > mnEnd )
 142             return 0;
 143
 144         sal_uInt32 nInt32  =   mpBuffer [mnCurrent++] & 0xFF;
 145         nInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 8;
 146         nInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 16;
 147         nInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 24;
 148         return nInt32;
 149     }
 150 };
 151
 152 #endif
 153
 154 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */