1// IndirectItem.h
2//
3// Copyright (c) 2003, Ingo Weinhold (bonefish@cs.tu-berlin.de)
4//
5// This program is free software; you can redistribute it and/or modify
6// it under the terms of the GNU General Public License as published by
7// the Free Software Foundation; either version 2 of the License, or
8// (at your option) any later version.
9//
10// This program is distributed in the hope that it will be useful,
11// but WITHOUT ANY WARRANTY; without even the implied warranty of
12// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13// GNU General Public License for more details.
14//
15// You should have received a copy of the GNU General Public License
16// along with this program; if not, write to the Free Software
17// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18//
19// You can alternatively use *this file* under the terms of the the MIT
20// license included in this package.
21
22#ifndef INDIRECT_ITEM_H
23#define INDIRECT_ITEM_H
24
25#include "endianess.h"
26
27// IndirectItem
28/*!
29	\class IndirectItem
30	\brief Provides access to the on-disk indirect item structure.
31
32	An indirect item lists raw blocks containing the contents of a file.
33*/
34class IndirectItem : public Item {
35public:
36	IndirectItem() : Item() {}
37	IndirectItem(LeafNode *node, ItemHeader *header)
38		: Item(node, header) {}
39
40	uint32 CountBlocks() const
41	{
42		return GetLen() / sizeof(uint32);
43	}
44
45	uint64 BlockNumberAt(int32 index) const
46	{
47		uint number = 0;
48		if (index >= 0 && index < (int32)CountBlocks())
49			number = le2h(((uint32*)GetData())[index]);
50		return number;
51	}
52};
53
54#endif	// INDIRECT_ITEM_H
55