mirror of
https://github.com/matrix-construct/construct
synced 2024-11-30 02:32:43 +01:00
132 lines
3.1 KiB
C++
132 lines
3.1 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_BUFFER_PARSE_BUFFER_H
|
|
|
|
/// The parse_buffer is the const version of a window_buffer. It is basically
|
|
/// the same idea with the underlying data is being read rather than written.
|
|
///
|
|
struct ircd::buffer::parse_buffer
|
|
:const_buffer
|
|
{
|
|
using closure = std::function<size_t (const const_buffer &)>;
|
|
using closure_cbuf = std::function<const_buffer (const const_buffer &)>;
|
|
using closure_spirit = std::function<bool (const char *&, const char *const &)>;
|
|
|
|
const_buffer base;
|
|
|
|
size_t remaining() const;
|
|
size_t consumed() const;
|
|
|
|
const_buffer completed() const;
|
|
explicit operator const_buffer() const;
|
|
|
|
const_buffer operator()(const closure &);
|
|
const_buffer operator()(const closure_cbuf &);
|
|
const_buffer operator()(const closure_spirit &);
|
|
const_buffer rewind(const size_t &n = 1);
|
|
|
|
parse_buffer(const const_buffer &base);
|
|
parse_buffer(const window_buffer &base);
|
|
parse_buffer() = default;
|
|
};
|
|
|
|
inline
|
|
ircd::buffer::parse_buffer::parse_buffer(const const_buffer &buf)
|
|
:const_buffer{buf}
|
|
,base{buf}
|
|
{}
|
|
|
|
inline ircd::buffer::const_buffer
|
|
ircd::buffer::parse_buffer::rewind(const size_t &n)
|
|
{
|
|
const size_t nmax
|
|
{
|
|
std::min(n, consumed())
|
|
};
|
|
|
|
static_cast<const_buffer &>(*this).begin() -= nmax;
|
|
assert(base.begin() <= begin());
|
|
assert(begin() <= base.end());
|
|
return completed();
|
|
}
|
|
|
|
inline ircd::buffer::const_buffer
|
|
ircd::buffer::parse_buffer::operator()(const closure_spirit &closure)
|
|
{
|
|
return operator()([&closure]
|
|
(const const_buffer &buf) -> size_t
|
|
{
|
|
const char *start(data(buf));
|
|
const char *const stop(start + size(buf));
|
|
if(!closure(start, stop))
|
|
return 0;
|
|
|
|
assert(start <= stop);
|
|
assert(start >= data(buf));
|
|
return start - data(buf);
|
|
});
|
|
}
|
|
|
|
inline ircd::buffer::const_buffer
|
|
ircd::buffer::parse_buffer::operator()(const closure_cbuf &closure)
|
|
{
|
|
return operator()([&closure]
|
|
(const const_buffer &buf)
|
|
{
|
|
return size(closure(buf));
|
|
});
|
|
}
|
|
|
|
inline ircd::buffer::const_buffer
|
|
ircd::buffer::parse_buffer::operator()(const closure &closure)
|
|
{
|
|
consume(*this, closure(*this));
|
|
return completed();
|
|
}
|
|
|
|
inline ircd::buffer::parse_buffer::operator
|
|
const_buffer()
|
|
const
|
|
{
|
|
return completed();
|
|
}
|
|
|
|
inline ircd::buffer::const_buffer
|
|
ircd::buffer::parse_buffer::completed()
|
|
const
|
|
{
|
|
assert(base.begin() <= begin());
|
|
assert(base.begin() + consumed() <= base.end());
|
|
return
|
|
{
|
|
base.begin(), base.begin() + consumed()
|
|
};
|
|
}
|
|
|
|
inline size_t
|
|
ircd::buffer::parse_buffer::consumed()
|
|
const
|
|
{
|
|
assert(begin() >= base.begin());
|
|
assert(begin() <= base.end());
|
|
return std::distance(base.begin(), begin());
|
|
}
|
|
|
|
inline size_t
|
|
ircd::buffer::parse_buffer::remaining()
|
|
const
|
|
{
|
|
assert(begin() <= base.end());
|
|
const size_t ret(std::distance(begin(), base.end()));
|
|
assert(ret == size(*this));
|
|
return ret;
|
|
}
|