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.
   4  *
   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 _MEMORY_BYTE_GRABBER_HXX_
  20 #define _MEMORY_BYTE_GRABBER_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     void SAL_CALL closeInput(  )
  79         throw(com::sun::star::io::NotConnectedException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
  80     {
  81     }
  82
  83     // XSeekable chained...
  84     sal_Int64 SAL_CALL seek( sal_Int64 location )
  85         throw(com::sun::star::lang::IllegalArgumentException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
  86     {
  87         if ( location < 0 || location > mnEnd )
  88             throw com::sun::star::lang::IllegalArgumentException ();
  89         mnCurrent = static_cast < sal_Int32 > ( location );
  90         return mnCurrent;
  91     }
  92     sal_Int64 SAL_CALL getPosition(  )
  93             throw(com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
  94     {
  95         return mnCurrent;
  96     }
  97     sal_Int64 SAL_CALL getLength(  )
  98             throw(com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
  99     {
 100         return mnEnd;
 101     }
 102     MemoryByteGrabber& operator >> (sal_Int8& rInt8)
 103     {
 104         if (mnCurrent + 1 > mnEnd )
 105             rInt8 = 0;
 106         else
 107             rInt8 = mpBuffer [mnCurrent++] & 0xFF;
 108         return *this;
 109     }
 110     MemoryByteGrabber& operator >> (sal_Int16& rInt16)
 111     {
 112         if (mnCurrent + 2 > mnEnd )
 113             rInt16 = 0;
 114         else
 115         {
 116             rInt16  =   mpBuffer[mnCurrent++] & 0xFF;
 117             rInt16 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;
 118         }
 119         return *this;
 120     }
 121     MemoryByteGrabber& operator >> (sal_Int32& rInt32)
 122     {
 123         if (mnCurrent + 4 > mnEnd )
 124             rInt32 = 0;
 125         else
 126         {
 127             rInt32  =   mpBuffer[mnCurrent++] & 0xFF;
 128             rInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;
 129             rInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 16;
 130             rInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 24;
 131         }
 132         return *this;
 133     }
 134
 135     MemoryByteGrabber& operator >> (sal_uInt8& rInt8)
 136     {
 137         if (mnCurrent + 1 > mnEnd )
 138             rInt8 = 0;
 139         else
 140             rInt8 = mpBuffer [mnCurrent++] & 0xFF;
 141         return *this;
 142     }
 143     MemoryByteGrabber& operator >> (sal_uInt16& rInt16)
 144     {
 145         if (mnCurrent + 2 > mnEnd )
 146             rInt16 = 0;
 147         else
 148         {
 149             rInt16  =   mpBuffer [mnCurrent++] & 0xFF;
 150             rInt16 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 8;
 151         }
 152         return *this;
 153     }
 154     MemoryByteGrabber& operator >> (sal_uInt32& rInt32)
 155     {
 156         if (mnCurrent + 4 > mnEnd )
 157             rInt32 = 0;
 158         else
 159         {
 160             rInt32  =   mpBuffer [mnCurrent++] & 0xFF;
 161             rInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 8;
 162             rInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 16;
 163             rInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 24;
 164         }
 165         return *this;
 166     }
 167 };
 168
 169 #endif
 170
 171 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */