buffer.cpp

   1 /*
   2  *  anytun
   3  *
   4  *  The secure anycast tunneling protocol (satp) defines a protocol used
   5  *  for communication between any combination of unicast and anycast
   6  *  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
   7  *  mode and allows tunneling of every ETHER TYPE protocol (e.g.
   8  *  ethernet, ip, arp ...). satp directly includes cryptography and
   9  *  message authentication based on the methodes used by SRTP.  It is
  10  *  intended to deliver a generic, scaleable and secure solution for
  11  *  tunneling and relaying of packets of any protocol.
  12  *
  13  *
  14  *  Copyright (C) 2007 anytun.org <satp@wirdorange.org>
  15  *
  16  *  This program is free software; you can redistribute it and/or modify
  17  *  it under the terms of the GNU General Public License version 2
  18  *  as published by the Free Software Foundation.
  19  *
  20  *  This program is distributed in the hope that it will be useful,
  21  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *  GNU General Public License for more details.
  24  *
  25  *  You should have received a copy of the GNU General Public License
  26  *  along with this program (see the file COPYING included with this
  27  *  distribution); if not, write to the Free Software Foundation, Inc.,
  28  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  29  */
  30
  31 #include <string>
  32
  33 #include "datatypes.h"
  34
  35 #include "buffer.h"
  36
  37 Buffer::Buffer() : buf_(0), length_(0)
  38 {
  39 }
  40
  41 Buffer::Buffer(u_int32_t length) : length_(length)
  42 {
  43   buf_ = new u_int8_t[length_];
  44   if(buf_)
  45     std::memset(buf_, 0, length_);
  46   else
  47     length_ = 0;
  48 }
  49
  50 Buffer::Buffer(u_int8_t* data, u_int32_t length) : length_(length)
  51 {
  52   buf_ = new u_int8_t[length_];
  53   if(buf_)
  54     std::memcpy(buf_, data, length_);
  55   else
  56     length_ = 0;
  57 }
  58
  59 Buffer::~Buffer()
  60 {
  61   if(buf_)
  62     delete[] buf_;
  63 }
  64
  65 Buffer::Buffer(const Buffer &src) : length_(src.length_)
  66 {
  67   buf_ = new u_int8_t[length_];
  68   if(buf_)
  69     std::memcpy(buf_, src.buf_, length_);
  70   else
  71     length_ = 0;
  72 }
  73
  74 void Buffer::operator=(const Buffer &src)
  75 {
  76   if(buf_)
  77     delete[] buf_;
  78
  79   length_ = src.length_;
  80
  81   buf_ = new u_int8_t[length_];
  82   if(buf_)
  83     std::memcpy(buf_, src.buf_, length_);
  84   else
  85     length_ = 0;
  86 }
  87
  88 u_int32_t Buffer::resize(u_int32_t new_length)
  89 {
  90   if(length_ == new_length)
  91     return length_;
  92
  93   u_int8_t *tmp = new u_int8_t[new_length];
  94   if(!tmp)
  95     return length_;
  96
  97   if(buf_)
  98   {
  99     std::memcpy(tmp, buf_, length_);
 100     delete[] buf_;
 101   }
 102
 103   length_ = new_length;
 104   buf_ = tmp;
 105   return length_;
 106 }
 107
 108 u_int32_t Buffer::getLength() const
 109 {
 110   return length_;
 111 }
 112
 113 u_int8_t* Buffer::getBuf()
 114 {
 115   return buf_;
 116 }
 117
 118 Buffer::operator u_int8_t*( )
 119 {
 120   return buf_;
 121 }