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// Copyright (C) 2003 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#ifndef DLIB_SOCKStREAMBUF_Hh_
#define DLIB_SOCKStREAMBUF_Hh_
#include <iosfwd>
#include <streambuf>
#include "../sockets.h"
#include "sockstreambuf_abstract.h"
#include "sockstreambuf_unbuffered.h"
namespace dlib
{
// ----------------------------------------------------------------------------------------
class sockstreambuf : public std::streambuf
{
/*!
INITIAL VALUE
- con == a connection
- in_buffer == an array of in_buffer_size bytes
- out_buffer == an array of out_buffer_size bytes
CONVENTION
- in_buffer == the input buffer used by this streambuf
- out_buffer == the output buffer used by this streambuf
- max_putback == the maximum number of chars to have in the put back buffer.
!*/
public:
// These typedefs are here for backwards compatibility with previous versions of
// dlib.
typedef sockstreambuf_unbuffered kernel_1a;
typedef sockstreambuf kernel_2a;
sockstreambuf (
connection* con_
) :
con(*con_),
out_buffer(0),
in_buffer(0),
autoflush(false)
{
init();
}
sockstreambuf (
const std::unique_ptr<connection>& con_
) :
con(*con_),
out_buffer(0),
in_buffer(0),
autoflush(false)
{
init();
}
virtual ~sockstreambuf (
)
{
sync();
delete [] out_buffer;
delete [] in_buffer;
}
connection* get_connection (
) { return &con; }
void flush_output_on_read()
{
autoflush = true;
}
bool flushes_output_on_read() const
{
return autoflush;
}
void do_not_flush_output_on_read()
{
autoflush = false;
}
protected:
void init (
)
{
try
{
out_buffer = new char[out_buffer_size];
in_buffer = new char[in_buffer_size];
}
catch (...)
{
if (out_buffer) delete [] out_buffer;
throw;
}
setp(out_buffer, out_buffer + (out_buffer_size-1));
setg(in_buffer+max_putback,
in_buffer+max_putback,
in_buffer+max_putback);
}
int flush_out_buffer (
)
{
int num = static_cast<int>(pptr()-pbase());
if (con.write(out_buffer,num) != num)
{
// the write was not successful so return EOF
return EOF;
}
pbump(-num);
return num;
}
// output functions
int_type overflow (
int_type c
);
int sync (
)
{
if (flush_out_buffer() == EOF)
{
// an error occurred
return -1;
}
return 0;
}
std::streamsize xsputn (
const char* s,
std::streamsize num
);
// input functions
int_type underflow(
);
std::streamsize xsgetn (
char_type* s,
std::streamsize n
);
private:
// member data
connection& con;
static const std::streamsize max_putback = 4;
static const std::streamsize out_buffer_size = 10000;
static const std::streamsize in_buffer_size = 10000;
char* out_buffer;
char* in_buffer;
bool autoflush;
};
// ----------------------------------------------------------------------------------------
}
#ifdef NO_MAKEFILE
#include "sockstreambuf.cpp"
#endif
#endif // DLIB_SOCKStREAMBUF_Hh_
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