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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_KERNEL_2_CPp_
#define DLIB_SOCKSTREAMBUF_KERNEL_2_CPp_
#include "sockstreambuf_kernel_2.h"
#include "../assert.h"
#include <cstring>
namespace dlib
{
// ----------------------------------------------------------------------------------------
// output functions
// ----------------------------------------------------------------------------------------
sockstreambuf_kernel_2::int_type sockstreambuf_kernel_2::
overflow (
int_type c
)
{
if (c != EOF)
{
*pptr() = c;
pbump(1);
}
if (flush_out_buffer() == EOF)
{
// an error occurred
return EOF;
}
return c;
}
// ----------------------------------------------------------------------------------------
std::streamsize sockstreambuf_kernel_2::
xsputn (
const char* s,
std::streamsize num
)
{
// Add a sanity check here
DLIB_ASSERT(num >= 0,
"\tstd::streamsize sockstreambuf::xsputn"
<< "\n\tThe number of bytes to write can't be negative"
<< "\n\tnum: " << num
<< "\n\tthis: " << this
);
std::streamsize space_left = static_cast<std::streamsize>(epptr()-pptr());
if (num <= space_left)
{
std::memcpy(pptr(),s,static_cast<size_t>(num));
pbump(static_cast<int>(num));
return num;
}
else
{
std::memcpy(pptr(),s,static_cast<size_t>(space_left));
s += space_left;
pbump(space_left);
std::streamsize num_left = num - space_left;
if (flush_out_buffer() == EOF)
{
// the write was not successful so return that 0 bytes were written
return 0;
}
if (num_left < out_buffer_size)
{
std::memcpy(pptr(),s,static_cast<size_t>(num_left));
pbump(num_left);
return num;
}
else
{
if (con.write(s,num_left) != num_left)
{
// the write was not successful so return that 0 bytes were written
return 0;
}
return num;
}
}
}
// ----------------------------------------------------------------------------------------
// input functions
// ----------------------------------------------------------------------------------------
sockstreambuf_kernel_2::int_type sockstreambuf_kernel_2::
underflow(
)
{
if (gptr() < egptr())
{
return static_cast<unsigned char>(*gptr());
}
int num_put_back = static_cast<int>(gptr() - eback());
if (num_put_back > max_putback)
{
num_put_back = max_putback;
}
// copy the putback characters into the putback end of the in_buffer
std::memmove(in_buffer+(max_putback-num_put_back), gptr()-num_put_back, num_put_back);
int num = con.read(in_buffer+max_putback, in_buffer_size-max_putback);
if (num <= 0)
{
// an error occurred or the connection is over which is EOF
return EOF;
}
// reset in_buffer pointers
setg (in_buffer+(max_putback-num_put_back),
in_buffer+max_putback,
in_buffer+max_putback+num);
return static_cast<unsigned char>(*gptr());
}
// ----------------------------------------------------------------------------------------
std::streamsize sockstreambuf_kernel_2::
xsgetn (
char_type* s,
std::streamsize n
)
{
std::streamsize temp = n;
while (n > 0)
{
int num = static_cast<int>(egptr() - gptr());
if (num >= n)
{
// copy data from our buffer
std::memcpy(s, gptr(), static_cast<size_t>(n));
gbump(static_cast<int>(n));
return temp;
}
// read more data into our buffer
if (num == 0)
{
if (underflow() == EOF)
break;
continue;
}
// copy all the data from our buffer
std::memcpy(s, gptr(), num);
n -= num;
gbump(num);
s += num;
}
return temp-n;
}
// ----------------------------------------------------------------------------------------
}
#endif // DLIB_SOCKSTREAMBUF_KERNEL_2_CPp_
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