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/***************************************************************************
* Copyright (C) 2005 by Joris Guisson *
* [email protected] *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#ifndef BTBNODE_H
#define BTBNODE_H
#include <qptrlist.h>
#include <qvaluelist.h>
#include <util/constants.h>
#include "value.h"
namespace bt
{
class BListNode;
/**
* @author Joris Guisson
* @brief Base class for a node in a b-encoded piece of data
*
* There are 3 possible pieces of data in b-encoded piece of data.
* This is the base class for all those 3 things.
*/
class BNode
{
public:
enum Type
{
VALUE,DICT,LIST
};
/**
* Constructor, sets the Type, and the offset into
* the data.
* @param type Type of node
* @param off The offset into the data
*/
BNode(Type type,Uint32 off);
virtual ~BNode();
/// Get the type of node
Type getType() const {return type;}
/// Get the offset in the bytearray where this node starts.
Uint32 getOffset() const {return off;}
/// Get the length this node takes up in the bytearray.
Uint32 getLength() const {return len;}
/// Set the length
void setLength(Uint32 l) {len = l;}
/// Print some debugging info
virtual void printDebugInfo() = 0;
private:
Type type;
Uint32 off,len;
};
/**
* @author Joris Guisson
* @brief Represents a value (string,bytearray or int) in bencoded data
*
* @todo Use QVariant
*/
class BValueNode : public BNode
{
Value v;
public:
BValueNode(const Value & v,Uint32 off);
virtual ~BValueNode();
const Value & data() const {return v;}
void printDebugInfo();
};
/**
* @author Joris Guisson
* @brief Represents a dictionary in bencoded data
*
*/
class BDictNode : public BNode
{
struct DictEntry
{
QByteArray key;
BNode* node;
};
QValueList<DictEntry> children;
public:
BDictNode(Uint32 off);
virtual ~BDictNode();
/**
* Insert a BNode in the dictionary.
* @param key The key
* @param node The node
*/
void insert(const QByteArray & key,BNode* node);
/**
* Get a BNode.
* @param key The key
* @return The node or 0 if there is no node with has key @a key
*/
BNode* getData(const QString & key);
/**
* Get a BListNode.
* @param key The key
* @return The node or 0 if there is no list node with has key @a key
*/
BListNode* getList(const QString & key);
/**
* Get a BDictNode.
* @param key The key
* @return The node or 0 if there is no dict node with has key @a key
*/
BDictNode* getDict(const QString & key);
/**
* Get a BDictNode.
* @param key The key
* @return The node or 0 if there is no dict node with has key @a key
*/
BDictNode* getDict(const QByteArray & key);
/**
* Get a BValueNode.
* @param key The key
* @return The node or 0 if there is no value node with has key @a key
*/
BValueNode* getValue(const QString & key);
void printDebugInfo();
};
/**
* @author Joris Guisson
* @brief Represents a list in bencoded data
*
*/
class BListNode : public BNode
{
QPtrList<BNode> children;
public:
BListNode(Uint32 off);
virtual ~BListNode();
/**
* Append a node to the list.
* @param node The node
*/
void append(BNode* node);
void printDebugInfo();
/// Get the number of nodes in the list.
Uint32 getNumChildren() const {return children.count();}
/**
* Get a node from the list
* @param idx The index
* @return The node or 0 if idx is out of bounds
*/
BNode* getChild(Uint32 idx) {return children.at(idx);}
/**
* Get a BListNode.
* @param idx The index
* @return The node or 0 if the index is out of bounds or the element
* at postion @a idx isn't a BListNode.
*/
BListNode* getList(Uint32 idx);
/**
* Get a BDictNode.
* @param idx The index
* @return The node or 0 if the index is out of bounds or the element
* at postion @a idx isn't a BDictNode.
*/
BDictNode* getDict(Uint32 idx);
/**
* Get a BValueNode.
* @param idx The index
* @return The node or 0 if the index is out of bounds or the element
* at postion @a idx isn't a BValueNode.
*/
BValueNode* getValue(Uint32 idx);
};
}
#endif
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