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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012- OpenVPN Inc.
//
// SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
#ifndef OPENVPN_BUFFER_BUFSTREAM_H
#define OPENVPN_BUFFER_BUFSTREAM_H
#include <streambuf>
#include <openvpn/buffer/buffer.hpp>
namespace openvpn {
class BufferStream : public std::streambuf
{
public:
BufferStream(Buffer &buffer)
: buf(buffer)
{
}
protected:
#if 0 // not implemented yet
// input
std::streamsize showmanyc() override;
std::streamsize xsgetn(char* s, std::streamsize n) override;
int underflow() override;
int uflow() override;
int pbackfail(int c = EOF) override;
#endif
// output
std::streamsize xsputn(const char *s, std::streamsize n) override
{
buf.write((unsigned char *)s, (size_t)n);
return n;
}
int overflow(int c = EOF) override
{
if (c != EOF)
{
unsigned char uc = (unsigned char)c;
buf.push_back(uc);
}
return c;
}
private:
Buffer &buf;
};
class BufferStreamOut : public std::ostream
{
public:
BufferStreamOut(Buffer &buffer)
: std::ostream(new BufferStream(buffer))
{
}
~BufferStreamOut()
{
delete rdbuf();
}
};
} // namespace openvpn
#endif
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