63e88f80
 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_DETAIL_BUFFER_HPP
#define BOOST_JSON_DETAIL_BUFFER_HPP
#include <boost/json/detail/config.hpp>
#include <boost/json/string_view.hpp>
#include <cstring>
BOOST_JSON_NS_BEGIN
namespace detail {
// A simple string-like temporary static buffer
template<std::size_t N>
class buffer
{
public:
using size_type = std::size_t;
buffer() = default;
bool
empty() const noexcept
{
return size_ == 0;
}
string_view
get() const noexcept
{
return {buf_, size_};
}
operator string_view() const noexcept
{
return get();
}
char const*
data() const noexcept
{
return buf_;
}
size_type
size() const noexcept
{
return size_;
}
size_type
capacity() const noexcept
{
return N - size_;
}
size_type
max_size() const noexcept
{
return N;
}
void
clear() noexcept
{
size_ = 0;
}
void
push_back(char ch) noexcept
{
BOOST_ASSERT(capacity() > 0);
buf_[size_++] = ch;
}
// append an unescaped string
void
append(
char const* s,
size_type n)
{
BOOST_ASSERT(n <= N - size_);
std::memcpy(buf_ + size_, s, n);
size_ += n;
}
// append valid 32-bit code point as utf8
void
append_utf8(
unsigned long cp) noexcept
{
auto dest = buf_ + size_;
if(cp < 0x80)
{
BOOST_ASSERT(size_ <= N - 1);
dest[0] = static_cast<char>(cp);
size_ += 1;
return;
}
if(cp < 0x800)
{
BOOST_ASSERT(size_ <= N - 2);
dest[0] = static_cast<char>( (cp >> 6) | 0xc0);
dest[1] = static_cast<char>( (cp & 0x3f) | 0x80);
size_ += 2;
return;
}
if(cp < 0x10000)
{
BOOST_ASSERT(size_ <= N - 3);
dest[0] = static_cast<char>( (cp >> 12) | 0xe0);
dest[1] = static_cast<char>(((cp >> 6) & 0x3f) | 0x80);
dest[2] = static_cast<char>( (cp & 0x3f) | 0x80);
size_ += 3;
return;
}
{
BOOST_ASSERT(size_ <= N - 4);
dest[0] = static_cast<char>( (cp >> 18) | 0xf0);
dest[1] = static_cast<char>(((cp >> 12) & 0x3f) | 0x80);
dest[2] = static_cast<char>(((cp >> 6) & 0x3f) | 0x80);
dest[3] = static_cast<char>( (cp & 0x3f) | 0x80);
size_ += 4;
}
}
private:
char buf_[N];
size_type size_ = 0;
};
} // detail
BOOST_JSON_NS_END
#endif
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