int PageDirectory::nextRecord(FileHandle &fh, RID &rid){
char buffer[PAGE_SIZE];
int pgid = rid.pageNum, slotid = -1;
RecordPage rp;
if (rid.pageNum != 0) {
fh.readPage(rid.pageNum, buffer);
rp = RecordPage(buffer);
if ((slotid = rp.nextRecord(rid.slotNum)) != -1) { // - 1 is current. + 0 is next
rid.slotNum = slotid;
return 0;
}
}
while (1) {
if ((pgid = nextRecordPageID(fh, pgid)) == -1)
return -1;
fh.readPage(pgid, buffer);
rp= RecordPage(buffer);
if ((slotid = rp.nextRecord(0)) != -1) {
rid.pageNum = pgid;
rid.slotNum = slotid;
return 0;
}
}
return -1;
}
// record pages in given range
VOID SANDBOX::RecordPageRange(const char * beginPage, const char * endPage)
{
for (const char * page = beginPage; page <= endPage; page += PageSize)
{
RecordPage(page);
}
}
int ShowNextPage(void)
{
int iError;
PT_PageDesc ptPage;
unsigned char *pucTextFileMemCurPos;
if (g_ptCurPage)
{
pucTextFileMemCurPos = g_ptCurPage->pucLcdNextPageFirstPosAtFile;
}
else
{
pucTextFileMemCurPos = g_pucLcdFirstPosAtFile;
}
iError = ShowOnePage(pucTextFileMemCurPos);
DBG_PRINTF("%s %d, %d\n", __FUNCTION__, __LINE__, iError);
if (iError == 0)
{
if (g_ptCurPage && g_ptCurPage->ptNextPage)
{
g_ptCurPage = g_ptCurPage->ptNextPage;
return 0;
}
ptPage = malloc(sizeof(T_PageDesc));
if (ptPage)
{
ptPage->pucLcdFirstPosAtFile = pucTextFileMemCurPos;
ptPage->pucLcdNextPageFirstPosAtFile = g_pucLcdNextPosAtFile;
ptPage->ptPrePage = NULL;
ptPage->ptNextPage = NULL;
g_ptCurPage = ptPage;
DBG_PRINTF("%s %d, pos = 0x%x\n", __FUNCTION__, __LINE__, (unsigned int)ptPage->pucLcdFirstPosAtFile);
RecordPage(ptPage);
return 0;
}
else
{
return -1;
}
}
return iError;
}