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  *
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  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 final
  27 {
  28     const sal_Int8 *mpBuffer;
  29     sal_Int32 mnCurrent, mnEnd;
  30 public:
  31     MemoryByteGrabber ( const css::uno::Sequence < sal_Int8 > & rBuffer )
  32     : mpBuffer ( rBuffer.getConstArray() )
  33     , mnCurrent ( 0 )
  34     , mnEnd ( rBuffer.getLength() )
  35     {
  36     }
  37     MemoryByteGrabber(css::uno::Sequence<sal_Int8> &&) = delete;
  38
  39     const sal_Int8 * getCurrentPos () const { return mpBuffer + mnCurrent; }
  40
  41     sal_Int32 remainingSize() const { return mnEnd - mnCurrent; }
  42
  43     // XInputStream chained
  44
  45     /// @throws css::io::NotConnectedException
  46     /// @throws css::io::BufferSizeExceededException
  47     /// @throws css::io::IOException
  48     /// @throws css::uno::RuntimeException
  49     void skipBytes( sal_Int32 nBytesToSkip )
  50     {
  51         mnCurrent += nBytesToSkip;
  52     }
  53
  54     // XSeekable chained...
  55     sal_Int16 ReadInt16()
  56     {
  57         if (mnCurrent + 2 > mnEnd )
  58             return 0;
  59         sal_Int16 nInt16  =   mpBuffer[mnCurrent++] & 0xFF;
  60         nInt16 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;
  61         return nInt16;
  62     }
  63     sal_Int32 ReadInt32()
  64     {
  65         if (mnCurrent + 4 > mnEnd )
  66             return 0;
  67
  68         sal_Int32 nInt32  =   mpBuffer[mnCurrent++] & 0xFF;
  69         nInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;
  70         nInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 16;
  71         nInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 24;
  72         return nInt32;
  73     }
  74
  75     sal_uInt32 ReadUInt32()
  76     {
  77         if (mnCurrent + 4 > mnEnd )
  78             return 0;
  79
  80         sal_uInt32 nInt32  =   mpBuffer [mnCurrent++] & 0xFF;
  81         nInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 8;
  82         nInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 16;
  83         nInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 24;
  84         return nInt32;
  85     }
  86 };
  87
  88 #endif
  89
  90 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */