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 INCLUDED_PACKAGE_SOURCE_ZIPAPI_MEMORYBYTEGRABBER_HXX
  20 #define INCLUDED_PACKAGE_SOURCE_ZIPAPI_MEMORYBYTEGRABBER_HXX
  21
  22 #include <com/sun/star/uno/Sequence.h>
  23
  24 class MemoryByteGrabber final
  25 {
  26     const sal_Int8 *mpBuffer;
  27     sal_Int32 mnCurrent, mnEnd;
  28 public:
  29     MemoryByteGrabber ( const css::uno::Sequence < sal_Int8 > & rBuffer )
  30     : mpBuffer ( rBuffer.getConstArray() )
  31     , mnCurrent ( 0 )
  32     , mnEnd ( rBuffer.getLength() )
  33     {
  34     }
  35     MemoryByteGrabber(css::uno::Sequence<sal_Int8> &&) = delete;
  36
  37     const sal_Int8 * getCurrentPos () const { return mpBuffer + mnCurrent; }
  38
  39     sal_Int32 remainingSize() const { return mnEnd - mnCurrent; }
  40
  41     // XInputStream chained
  42
  43     /// @throws css::io::NotConnectedException
  44     /// @throws css::io::BufferSizeExceededException
  45     /// @throws css::io::IOException
  46     /// @throws css::uno::RuntimeException
  47     void skipBytes( sal_Int32 nBytesToSkip )
  48     {
  49         mnCurrent += nBytesToSkip;
  50     }
  51
  52     // XSeekable chained...
  53     sal_Int16 ReadInt16()
  54     {
  55         if (mnCurrent + 2 > mnEnd )
  56             return 0;
  57         sal_Int16 nInt16  =   mpBuffer[mnCurrent++] & 0xFF;
  58         nInt16 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;
  59         return nInt16;
  60     }
  61
  62     sal_Int16 ReadUInt16()
  63     {
  64         if (mnCurrent + 2 > mnEnd )
  65             return 0;
  66         sal_uInt16 nInt16  =  mpBuffer[mnCurrent++] & 0xFF;
  67         nInt16 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;
  68         return nInt16;
  69     }
  70
  71     sal_Int32 ReadInt32()
  72     {
  73         if (mnCurrent + 4 > mnEnd )
  74             return 0;
  75
  76         sal_Int32 nInt32  =   mpBuffer[mnCurrent++] & 0xFF;
  77         nInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;
  78         nInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 16;
  79         nInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 24;
  80         return nInt32;
  81     }
  82
  83     sal_uInt32 ReadUInt32()
  84     {
  85         if (mnCurrent + 4 > mnEnd )
  86             return 0;
  87
  88         sal_uInt32 nInt32  =   mpBuffer [mnCurrent++] & 0xFF;
  89         nInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 8;
  90         nInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 16;
  91         nInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 24;
  92         return nInt32;
  93     }
  94
  95     sal_Int64 ReadInt64()
  96     {
  97         if (mnCurrent + 8 > mnEnd)
  98             return 0;
  99
 100         sal_Int64 nInt64 = mpBuffer[mnCurrent++] & 0xFF;
 101         nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 8;
 102         nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 16;
 103         nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 24;
 104         nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 32;
 105         nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 40;
 106         nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 48;
 107         nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 56;
 108         return nInt64;
 109     }
 110
 111     sal_uInt64 ReadUInt64()
 112     {
 113         if (mnCurrent + 8 > mnEnd)
 114             return 0;
 115
 116         sal_uInt64 nInt64 = mpBuffer[mnCurrent++] & 0xFF;
 117         nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 8;
 118         nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 16;
 119         nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 24;
 120         nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 32;
 121         nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 40;
 122         nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 48;
 123         nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 56;
 124         return nInt64;
 125     }
 126 };
 127
 128 #endif
 129
 130 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */