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#include "vdlog.h"
#include "vdi_port.h"
VDIPort::VDIPort()
{
ZeroMemory(&_write, offsetof(VDIPortBuffer, ring));
_write.start = _write.end = _write.ring;
ZeroMemory(&_read, offsetof(VDIPortBuffer, ring));
_read.start = _read.end = _read.ring;
}
size_t VDIPort::read_ring_size()
{
return (BUF_SIZE + _read.end - _read.start) % BUF_SIZE;
}
size_t VDIPort::write_ring_free_space()
{
return (BUF_SIZE + _write.start - _write.end - 1) % BUF_SIZE;
}
size_t VDIPort::ring_write(const void* buf, size_t size)
{
size_t free_size = (BUF_SIZE + _write.start - _write.end - 1) % BUF_SIZE;
size_t n;
if (size > free_size) {
size = free_size;
}
if (_write.end < _write.start) {
memcpy(_write.end, buf, size);
} else {
n = MIN(size, (size_t)(&_write.ring[BUF_SIZE] - _write.end));
memcpy(_write.end, buf, n);
if (size > n) {
memcpy(_write.ring, (uint8_t*)buf + n, size - n);
}
}
_write.end = _write.ring + (_write.end - _write.ring + size) % BUF_SIZE;
return size;
}
size_t VDIPort::read_ring_continuous_remaining_size()
{
DWORD size;
if (_read.start <= _read.end) {
size = MIN(BUF_SIZE - 1, (int)(&_read.ring[BUF_SIZE] - _read.end));
} else {
size = (DWORD)(_read.start - _read.end - 1);
}
return size;
}
size_t VDIPort::ring_read(void* buf, size_t size)
{
size_t n;
size_t m = 0;
if (_read.start == _read.end) {
return 0;
}
if (_read.start < _read.end) {
n = MIN(size, (size_t)(_read.end - _read.start));
memcpy(buf, _read.start, n);
} else {
n = MIN(size, (size_t)(&_read.ring[BUF_SIZE] - _read.start));
memcpy(buf, _read.start, n);
if (size > n) {
m = MIN(size - n, (size_t)(_read.end - _read.ring));
memcpy((uint8_t*)buf + n, _read.ring, m);
}
}
_read.start = _read.ring + (_read.start - _read.ring + n + m) % BUF_SIZE;
return n + m;
}
int VDIPort::handle_error()
{
switch (GetLastError()) {
case ERROR_CONNECTION_INVALID:
vd_printf("port reset");
_write.start = _write.end = _write.ring;
_read.start = _read.end = _read.ring;
return VDI_PORT_RESET;
default:
vd_printf("port io failed: %lu", GetLastError());
return VDI_PORT_ERROR;
}
}
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