/usr/include/wibble/sys/netbuffer.h is in libwibble-dev 1.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 | #ifndef WIBBLE_SYS_NETBUFFER_H
#define WIBBLE_SYS_NETBUFFER_H
/*
* Variable-size, reference-counted memory buffer used to access network
* packets
*
* Copyright (C) 2003--2006 Enrico Zini <enrico@debian.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <wibble/sys/buffer.h>
#include <wibble/exception.h>
namespace wibble {
namespace sys {
/**
* Buffer whose starting can be moved back and forth, useful to decapsulate
* stacked network packets
*/
class NetBuffer : public Buffer
{
public:
/**
* Offset in bytes of the NetBuffer start, from the beginning of the memory
* area we manage
*/
size_t cursor;
public:
NetBuffer() throw () : Buffer(), cursor(0) {}
NetBuffer(size_t size) : Buffer(size), cursor(0) {}
NetBuffer(void* buf, size_t size, bool own = true)
: Buffer(buf, size, own), cursor(0) {}
NetBuffer(const void* buf, size_t size)
: Buffer(buf, size), cursor(0) {}
NetBuffer(const Buffer& buf) throw () : Buffer(buf), cursor(0) {}
NetBuffer(const NetBuffer& buf) throw ()
: Buffer(buf), cursor(buf.cursor) {}
NetBuffer& operator=(const Buffer& buf)
{
Buffer::operator=(buf);
cursor = 0;
return *this;
}
NetBuffer& operator=(const NetBuffer& buf)
{
Buffer::operator=(buf);
cursor = buf.cursor;
return *this;
}
/// Return a pointer to the buffer
const void* data(size_t ofs = 0) const throw () { return static_cast<const char*>(Buffer::data()) + cursor + ofs; }
/// Return a pointer to the buffer
void* data(size_t ofs = 0) throw () { return static_cast<char*>(Buffer::data()) + cursor + ofs; }
/// Return the buffer size
size_t size() const throw () { return Buffer::size() - cursor; }
/**
* Check if the buffer is long enough to contain a structure T at the given
* offset
*/
template<class T>
bool fits(size_t ofs = 0) const throw ()
{
return cursor + ofs + sizeof(T) < size();
}
/**
* Access the buffer contents as a structure T at the given offset
*/
template<class T>
const T* cast(size_t ofs = 0) const throw (wibble::exception::Consistency)
{
if (cursor + ofs + sizeof(T) >= size())
throw wibble::exception::Consistency("reading from buffer", "tried to read past the end of the buffer");
return static_cast<const T*>(data(ofs));
}
/**
* Return another NetBuffer starting ofs bytes from the beginning of this one
*/
NetBuffer operator+(size_t ofs) throw (wibble::exception::Consistency)
{
return after(ofs);
}
/**
* Return another NetBuffer starting ofs bytes from the beginning of this one
*/
const NetBuffer after(size_t ofs) const throw (wibble::exception::Consistency)
{
NetBuffer res(*this);
res.skip(ofs);
return res;
}
/**
* Return another NetBuffer starting just after sizeof(T) from the
* beginning of this one
*/
template<class T>
const NetBuffer after() const throw (wibble::exception::Consistency)
{
NetBuffer res(*this);
res.skip(sizeof(T));
return res;
}
/**
* Move the starting point of this buffer ofs bytes from the beginning
*/
NetBuffer& operator+=(size_t ofs) throw (wibble::exception::Consistency)
{
skip(ofs);
return *this;
}
/**
* Move the starting point of this buffer sizeof(T) bytes from the
* beginning
*/
template<class T>
void skip() throw (wibble::exception::Consistency)
{
skip(sizeof(T));
}
/**
* Move the starting point of this buffer ofs bytes from the beginning
*/
void skip(size_t t) throw (wibble::exception::Consistency)
{
if (cursor + t >= size())
throw wibble::exception::Consistency("reading from buffer", "tried to skip past the end of the buffer");
cursor += t;
}
};
}
}
// vim:set ts=4 sw=4:
#endif
|