ceph/src/boost/tools/bcp/fileview.cpp

   1 /*
   2  *
   3  * Copyright (c) 2003 Dr John Maddock
   4  * Use, modification and distribution is subject to the
   5  * Boost Software License, Version 1.0. (See accompanying file
   6  * LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7  *
   8  * This file implements the fileview class
   9  */
  10
  11 #include "fileview.hpp"
  12 #include <boost/filesystem/fstream.hpp>
  13 #include <vector>
  14 #include <algorithm>
  15 #include <string>
  16 #include <fstream>
  17 #include <istream>
  18 #include <stdexcept>
  19
  20 struct fileview::implementation
  21 {
  22    std::vector<char> m_data;
  23 };
  24
  25
  26 // construct:
  27 fileview::fileview()
  28 {
  29    pimpl.reset(new implementation());
  30 }
  31
  32 fileview::fileview(const boost::filesystem::path& p)
  33 {
  34    pimpl.reset(new implementation());
  35    open(p);
  36 }
  37
  38 fileview::~fileview()
  39 {
  40 }
  41
  42 fileview::fileview(const fileview& )
  43 {
  44 }
  45
  46 fileview& fileview::operator=(const fileview& that)
  47 {
  48    pimpl = that.pimpl;
  49    return *this;
  50 }
  51
  52 void fileview::close()
  53 {
  54    cow();
  55    pimpl->m_data.clear();
  56 }
  57
  58 void fileview::open(const boost::filesystem::path& p)
  59 {
  60    cow();
  61    boost::filesystem::ifstream is(p);
  62    if(!is)
  63    {
  64       std::string msg("Bad file name: ");
  65       msg += p.string();
  66       std::runtime_error e(msg);
  67       boost::throw_exception(e);
  68    }
  69    std::istreambuf_iterator<char> in(is);
  70    std::istreambuf_iterator<char> end;
  71    std::copy(in, end, std::back_inserter(pimpl->m_data));
  72 }
  73
  74 // iterators:
  75 fileview::const_iterator         fileview::begin() const
  76 {
  77    return pimpl->m_data.size() ? &(pimpl->m_data[0]) : 0;
  78 }
  79
  80 fileview::const_iterator         fileview::end() const
  81 {
  82    return begin() + pimpl->m_data.size();
  83 }
  84
  85 #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
  86 fileview::const_reverse_iterator fileview::rbegin() const
  87 {
  88    return const_reverse_iterator(end());
  89 }
  90
  91 fileview::const_reverse_iterator fileview::rend() const
  92 {
  93    return const_reverse_iterator(begin());
  94 }
  95 #endif
  96
  97 // capacity:
  98 fileview::size_type fileview::size() const
  99 {
 100    return pimpl->m_data.size();
 101 }
 102
 103 fileview::size_type fileview::max_size() const
 104 {
 105    return pimpl->m_data.max_size();
 106 }
 107
 108 bool      fileview::empty() const
 109 {
 110    return pimpl->m_data.empty();
 111 }
 112
 113 // element access:
 114 fileview::const_reference fileview::operator[](fileview::size_type n) const
 115 {
 116    return pimpl->m_data[n];
 117 }
 118
 119 fileview::const_reference fileview::at(size_type n) const
 120 {
 121    return pimpl->m_data.at(n);
 122 }
 123
 124 fileview::const_reference fileview::front() const
 125 {
 126    return pimpl->m_data.front();
 127 }
 128
 129 fileview::const_reference fileview::back() const
 130 {
 131    return pimpl->m_data.back();
 132 }
 133
 134 void fileview::swap(fileview& that)
 135 {
 136    pimpl.swap(that.pimpl);
 137 }
 138
 139 void fileview::cow()
 140 {
 141    if(!pimpl.unique())
 142       pimpl.reset(new implementation(*pimpl));
 143 }