void BufWrite(int blkno, void* pData) {
Buf* find = BufFind(blkno);
Buf* pNewBuf;
// HIT
if (find != NULL) {
if (find->state == BUF_STATE_CLEAN && find->state != -1) {
// Move to Dirty list.
find->state = BUF_STATE_DIRTY;
BufDeleteBuf(find);
BufInsertToTail(find, blkno, BUF_LIST_DIRTY);
}
LruInsert(find);
memmove(find->pMem, pData, strlen(pData) + 1);
}
// MISS
else {
// Create New Buffer
pNewBuf = BufGetNewBuffer();
pNewBuf->blkno = blkno;
pNewBuf->state = BUF_STATE_DIRTY;
BufInsertToTail(pNewBuf, pNewBuf->blkno, BUF_LIST_DIRTY);
LruInsert(pNewBuf);
memmove(pNewBuf->pMem, pData, strlen(pData) + 1);
}
}
void BufWrite(int blkno, void* pData)
{
Buf* pBuf;
pBuf = BufFind(blkno);
if( pBuf == NULL )
{
char ptr_tmp_data[BLOCK_SIZE];
BufRead(blkno, ptr_tmp_data);
pBuf = BufFind(blkno);
}
removeClean(blkno);
if( ! existDirty(blkno) )
{
insertDirty(pBuf);
}
removeLru(blkno);
insertLru(pBuf);
copyBlock((char*)pData, (char*)pBuf->pMem);
}
void BufRead(int blkno, void* pData) {
Buf* find = BufFind(blkno);
Buf* pNewBuf;
// HIT
if (find != NULL) {
LruInsert(find);
//pData = find->pMem;
memmove(pData, find->pMem, strlen(find->pMem) + 1);
}
// MISS
else {
// Create New Buffer
pNewBuf = BufGetNewBuffer();
pNewBuf->blkno = blkno;
pNewBuf->state = BUF_STATE_CLEAN;
DevReadBlock(blkno, pNewBuf->pMem);
BufInsertToTail(pNewBuf, pNewBuf->blkno, BUF_LIST_CLEAN);
LruInsert(pNewBuf);
memmove(pData, pNewBuf->pMem, strlen(pNewBuf->pMem) + 1);
}
}
void BufRead(int blkno, void* pData)
{
Buf* pBuf;
pBuf = BufFind(blkno);
if( pBuf != NULL )
{
removeLru(blkno);
insertLru(pBuf);
copyBlock((char*)pBuf->pMem, (char*)pData);
return;
}
pBuf = popFree();
pBuf->blkno = blkno;
//pBuf->pMem = (void*)malloc(BLOCK_SIZE);
DevReadBlock(blkno, (char*)pBuf->pMem);
insertHash(pBuf);
insertClean(pBuf);
removeLru(blkno);
insertLru(pBuf);
copyBlock((char*)pBuf->pMem, (char*)pData);
}
int StringBrowser::SelectionIndex (int index) {
return BufFind(index, strbuf, strcount, selbuf, selcount);
}
