73ef4ff3
 Hu Chunming
提交三方库
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//
// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/json
//
#ifndef BOOST_JSON_EXAMPLE_FILE_HPP
#define BOOST_JSON_EXAMPLE_FILE_HPP
#include <boost/json/detail/config.hpp>
#include <cstdio>
#include <string>
class file
{
FILE* f_ = nullptr;
long size_ = 0;
void
fail(boost::json::error_code& ec)
{
ec.assign( errno, boost::system::generic_category() );
}
public:
~file()
{
if(f_)
std::fclose(f_);
}
file() = default;
file( file&& other ) noexcept
: f_(other.f_)
{
other.f_ = nullptr;
}
file( char const* path, char const* mode )
{
open( path, mode );
}
file&
operator=(file&& other) noexcept
{
close();
f_ = other.f_;
other.f_ = nullptr;
return *this;
}
void
close()
{
if(f_)
{
std::fclose(f_);
f_ = nullptr;
size_ = 0;
}
}
void
open(
char const* path,
char const* mode,
boost::json::error_code& ec)
{
close();
#if defined(_MSC_VER)
# pragma warning( push )
# pragma warning( disable : 4996 )
#endif
f_ = std::fopen( path, mode );
#if defined(_MSC_VER)
# pragma warning( pop )
#endif
if( ! f_ )
return fail(ec);
if( std::fseek( f_, 0, SEEK_END ) != 0)
return fail(ec);
size_ = std::ftell( f_ );
if( size_ == -1 )
{
size_ = 0;
return fail(ec);
}
if( std::fseek( f_, 0, SEEK_SET ) != 0)
return fail(ec);
}
void
open(
char const* path,
char const* mode)
{
boost::json::error_code ec;
open(path, mode, ec);
if(ec)
throw boost::json::system_error(ec);
}
long
size() const noexcept
{
return size_;
}
bool
eof() const noexcept
{
return std::feof( f_ ) != 0;
}
std::size_t
read( char* data, std::size_t size, boost::json::error_code& ec)
{
auto const nread = std::fread( data, 1, size, f_ );
if( std::ferror(f_) )
ec.assign( errno, boost::system::generic_category() );
return nread;
}
std::size_t
read( char* data, std::size_t size )
{
boost::json::error_code ec;
auto const nread = read( data, size, ec );
if(ec)
throw boost::json::system_error(ec);
return nread;
}
};
inline
std::string
read_file( char const* path, boost::json::error_code& ec )
{
file f;
f.open( path, "r", ec );
if(ec)
return {};
std::string s;
s.resize( f.size() );
s.resize( f.read( &s[0], s.size(), ec) );
if(ec)
return {};
return s;
}
inline
std::string
read_file( char const* path )
{
boost::json::error_code ec;
auto s = read_file( path, ec);
if(ec)
throw boost::json::system_error(ec);
return s;
}
#endif
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