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/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "BufferedSocket.hxx"
#include "system/SocketError.hxx"
#include "util/fifo_buffer.h"
#include <assert.h>
#include <stdint.h>
#include <string.h>
BufferedSocket::~BufferedSocket()
{
if (input != nullptr)
fifo_buffer_free(input);
}
BufferedSocket::ssize_t
BufferedSocket::DirectRead(void *data, size_t length)
{
const auto nbytes = SocketMonitor::Read((char *)data, length);
if (gcc_likely(nbytes > 0))
return nbytes;
if (nbytes == 0) {
OnSocketClosed();
return -1;
}
const auto code = GetSocketError();
if (IsSocketErrorAgain(code))
return 0;
if (IsSocketErrorClosed(code))
OnSocketClosed();
else
OnSocketError(NewSocketError(code));
return -1;
}
bool
BufferedSocket::ReadToBuffer()
{
assert(IsDefined());
if (input == nullptr)
input = fifo_buffer_new(8192);
size_t length;
void *buffer = fifo_buffer_write(input, &length);
assert(buffer != nullptr);
const auto nbytes = DirectRead(buffer, length);
if (nbytes > 0)
fifo_buffer_append(input, nbytes);
return nbytes >= 0;
}
bool
BufferedSocket::ResumeInput()
{
assert(IsDefined());
if (input == nullptr) {
ScheduleRead();
return true;
}
while (true) {
size_t length;
const void *data = fifo_buffer_read(input, &length);
if (data == nullptr) {
ScheduleRead();
return true;
}
const auto result = OnSocketInput(data, length);
switch (result) {
case InputResult::MORE:
if (fifo_buffer_is_full(input)) {
// TODO
OnSocketError(g_error_new_literal(g_quark_from_static_string("buffered_socket"),
0, "Input buffer is full"));
return false;
}
ScheduleRead();
return true;
case InputResult::PAUSE:
CancelRead();
return true;
case InputResult::AGAIN:
continue;
case InputResult::CLOSED:
return false;
}
}
}
void
BufferedSocket::ConsumeInput(size_t nbytes)
{
assert(IsDefined());
fifo_buffer_consume(input, nbytes);
}
bool
BufferedSocket::OnSocketReady(unsigned flags)
{
assert(IsDefined());
if (gcc_unlikely(flags & (ERROR|HANGUP))) {
OnSocketClosed();
return false;
}
if (flags & READ) {
assert(input == nullptr || !fifo_buffer_is_full(input));
if (!ReadToBuffer() || !ResumeInput())
return false;
if (input == nullptr || !fifo_buffer_is_full(input))
ScheduleRead();
}
return true;
}
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