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#include <LibCore/CIODevice.h>
#include <unistd.h>
#include <sys/select.h>
#include <stdio.h>
CIODevice::CIODevice(CObject* parent)
: CObject(parent)
{
}
CIODevice::~CIODevice()
{
}
const char* CIODevice::error_string() const
{
return strerror(m_error);
}
ByteBuffer CIODevice::read(int max_size)
{
if (m_fd < 0)
return { };
if (!max_size)
return { };
auto buffer = ByteBuffer::create_uninitialized(max_size);
auto* buffer_ptr = (char*)buffer.pointer();
int remaining_buffer_space = buffer.size();
if (!m_buffered_data.is_empty()) {
int taken_from_buffered = min(remaining_buffer_space, m_buffered_data.size());
memcpy(buffer_ptr, m_buffered_data.data(), taken_from_buffered);
Vector<byte> new_buffered_data;
new_buffered_data.append(m_buffered_data.data() + taken_from_buffered, m_buffered_data.size() - taken_from_buffered);
m_buffered_data = move(new_buffered_data);
remaining_buffer_space -= taken_from_buffered;
buffer_ptr += taken_from_buffered;
}
if (!remaining_buffer_space)
return buffer;
int nread = ::read(m_fd, buffer_ptr, remaining_buffer_space);
if (nread < 0) {
set_error(errno);
return { };
}
if (nread == 0) {
set_eof(true);
return { };
}
buffer.trim(nread);
return buffer;
}
bool CIODevice::can_read_from_fd() const
{
// FIXME: Can we somehow remove this once CSocket is implemented using non-blocking sockets?
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(m_fd, &rfds);
struct timeval timeout { 0, 0 };
int rc = select(m_fd + 1, &rfds, nullptr, nullptr, &timeout);
if (rc < 0) {
// NOTE: We don't set m_error here.
perror("CIODevice::can_read: select");
return false;
}
return FD_ISSET(m_fd, &rfds);
}
bool CIODevice::can_read_line()
{
if (m_eof && !m_buffered_data.is_empty())
return true;
if (m_buffered_data.contains_slow('\n'))
return true;
if (!can_read_from_fd())
return false;
populate_read_buffer();
return m_buffered_data.contains_slow('\n');
}
bool CIODevice::can_read() const
{
return !m_buffered_data.is_empty() || can_read_from_fd();
}
ByteBuffer CIODevice::read_all()
{
ByteBuffer buffer;
if (!m_buffered_data.is_empty()) {
buffer = ByteBuffer::copy(m_buffered_data.data(), m_buffered_data.size());
m_buffered_data.clear();
}
while (can_read_from_fd()) {
char read_buffer[4096];
int nread = ::read(m_fd, read_buffer, sizeof(read_buffer));
if (nread < 0) {
set_error(nread);
return buffer;
}
if (nread == 0) {
set_eof(true);
break;
}
buffer.append(read_buffer, nread);
}
return buffer;
}
ByteBuffer CIODevice::read_line(int max_size)
{
if (m_fd < 0)
return { };
if (!max_size)
return { };
if (!can_read_line())
return { };
if (m_eof) {
if (m_buffered_data.size() > max_size) {
printf("CIODevice::read_line: At EOF but there's more than max_size(%d) buffered\n", max_size);
return { };
}
auto buffer = ByteBuffer::copy(m_buffered_data.data(), m_buffered_data.size());
m_buffered_data.clear();
return buffer;
}
auto line = ByteBuffer::create_uninitialized(max_size + 1);
int line_index = 0;
while (line_index < max_size) {
byte ch = m_buffered_data[line_index];
line[line_index++] = ch;
if (ch == '\n') {
Vector<byte> new_buffered_data;
new_buffered_data.append(m_buffered_data.data() + line_index, m_buffered_data.size() - line_index);
m_buffered_data = move(new_buffered_data);
line[line_index] = '\0';
line.trim(line_index + 1);
return line;
}
}
return { };
}
bool CIODevice::populate_read_buffer()
{
if (m_fd < 0)
return false;
auto buffer = ByteBuffer::create_uninitialized(PAGE_SIZE);
int nread = ::read(m_fd, buffer.pointer(), buffer.size());
if (nread < 0) {
set_error(errno);
return false;
}
if (nread == 0) {
set_eof(true);
return false;
}
buffer.trim(nread);
m_buffered_data.append(buffer.pointer(), buffer.size());
return true;
}
bool CIODevice::close()
{
if (fd() < 0 || mode() == NotOpen)
return false;
int rc = ::close(fd());
if (rc < 0) {
set_error(rc);
return false;
}
set_fd(-1);
set_mode(CIODevice::NotOpen);
return true;
}
bool CIODevice::seek(signed_qword offset)
{
int rc = lseek(m_fd, offset, SEEK_SET);
if (rc < 0) {
perror("CIODevice::seek: lseek");
return false;
}
m_buffered_data.clear();
return true;
}
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