extern bool WndGetLine( a_window *wnd, int row, int piece,
wnd_line_piece *line )
{
int virtual_row;
bool success;
virtual_row = WndVirtualRow( wnd, row );
if( _Is( wnd, WSW_CACHE_LINES ) ) {
if( FindCacheLine( wnd, virtual_row, piece, line ) ) return( TRUE );
}
line->attr = WndPlainAttr;
line->indent = 0;
line->static_text = FALSE;
line->tabstop = TRUE;
line->hot = FALSE;
line->extent = WND_NO_EXTEND;
line->master_tabstop = FALSE;
line->underline = FALSE;
line->draw_bar = FALSE;
line->vertical_line = FALSE;
line->draw_hook = FALSE;
line->draw_line_hook = FALSE;
line->bitmap = FALSE;
line->use_piece0_attr = FALSE;
line->use_prev_attr = FALSE;
line->use_key = TRUE;
line->text = "";
line->hint = "";
if( virtual_row < -wnd->title_size ) return( FALSE );
if( row == wnd->u.button_down.row && piece == wnd->u.button_down.piece ) {
_Set( wnd, WSW_ALTERNATE_BIT );
}
success = wnd->info->getline( wnd, virtual_row, piece, line );
_Clr( wnd, WSW_ALTERNATE_BIT );
if( success ) {
if( !(line->bitmap|line->vertical_line|line->draw_hook|line->draw_line_hook|line->draw_bar) ) {
line->length = strlen( line->text );
}
if( virtual_row > wnd->max_row ) wnd->max_row = virtual_row;
}
if( success ) {
if( _Is( wnd, WSW_CACHE_LINES ) ) {
SetCacheLine( wnd, virtual_row, piece, line );
}
}
return( success );
}
const SectorReader::Cache* SectorReader::GetCacheLine(u64 block_num)
{
if (auto entry = FindCacheLine(block_num))
return entry;
// Cache miss. Fault in the missing entry.
Cache* cache = GetEmptyCacheLine();
// We only read aligned chunks, this avoids duplicate overlapping entries.
u64 chunk_idx = block_num / m_chunk_blocks;
u32 blocks_read = ReadChunk(cache->data.data(), chunk_idx);
if (!blocks_read)
return nullptr;
cache->Fill(chunk_idx * m_chunk_blocks, blocks_read);
// Secondary check for out-of-bounds read.
// If we got less than m_chunk_blocks, we may still have missed.
// We do this after the cache fill since the cache line itself is
// fine, the problem is being asked to read past the end of the disk.
return cache->Contains(block_num) ? cache : nullptr;
}
