//------------------------------------------------------------------------------
stPage * stPlainDiskPageManager::GetPage(stPageID pageid){
stPage * myPage;
// Do not allow users to load header page from this file.
if ((pageid != 0) && (pageid <= header->PageCount)){
// Get from cache
myPage = pageInstanceCache->Get();
// Read data...
lseek(fd, PageID2Offset(pageid), SEEK_SET);
read(fd, myPage->GetData(), header->PageSize);
myPage->SetPageID(pageid);
// Update Counters
UpdateReadCounter();
return myPage;
}else{
// Error!!!
#ifdef __stDEBUG__
throw invalid_argument("Invalid page ID.");
#else
return NULL;
#endif //__stDEBUG__
}//end if
}//end stPlainDiskPageManager::GetPage
//------------------------------------------------------------------------------
stPage * stDiskPageManager::GetHeaderPage(){
stPage *hPage = new stPage(this->GetHeaderPageSize());
myStorage->ReadUserHeader(hPage->GetData());
// Update Counters
UpdateReadCounter();
return hPage;
}//end stDiskPageManager::GetHeaderPage()
stPage * stPlainDiskPageManager::GetHeaderPage(){
// Update read count
UpdateReadCounter();
// Effective read
lseek(fd, 0, SEEK_SET);
read(fd, (void *)this->headerPage->GetTrueData(), header->PageSize);
return this->headerPage;
}//end stPlainDiskPageManager::GetheaderPage
static int RawCanWrite(SexyAL_device *device, uint32_t *can_write)
{
CMI8738_Driver_t *ds = (CMI8738_Driver_t *)device->private_data;
UpdateReadCounter(ds);
// Handle underflow.
if(ds->write_counter < ds->read_counter)
ds->write_counter = ds->read_counter;
*can_write = (device->buffering.buffer_size - (ds->write_counter - ds->read_counter)) << 2;
return(1);
}
static int Clear(SexyAL_device *device)
{
CMI8738_Driver_t *ds = (CMI8738_Driver_t *)device->private_data;
const uint32_t base = ds->dmabuf.rm_segment << 4;
const uint32_t siz = ds->dmabuf.size << 4;
Pause(device, true);
_farsetsel(_dos_ds);
for(unsigned i = 0; i < siz; i += 4)
_farnspokel(base + i, 0);
UpdateReadCounter(ds);
ds->write_counter = ds->read_counter;
return(1);
}
//------------------------------------------------------------------------------
stPage * stDiskPageManager::GetPage(stPageID pageid){
stPage * myPage;
if ((int)pageid <= myStorage->GetTotalPagesIncludingDisposed()){
// Get from cache
myPage = pageInstanceCache->Get();
myStorage->ReadPage(pageid-1, myPage->GetData());
myPage->SetPageID(pageid);
// Update Counters
UpdateReadCounter();
return myPage;
}else{
// Error!!!
return NULL;
}//end if
}//end stDiskPageManager::GetPage()
