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/*
** ClanLib SDK
** Copyright (c) 1997-2005 The ClanLib Team
**
** This software is provided 'as-is', without any express or implied
** warranty. In no event will the authors be held liable for any damages
** arising from the use of this software.
**
** Permission is granted to anyone to use this software for any purpose,
** including commercial applications, and to alter it and redistribute it
** freely, subject to the following restrictions:
**
** 1. The origin of this software must not be misrepresented; you must not
** claim that you wrote the original software. If you use this software
** in a product, an acknowledgment in the product documentation would be
** appreciated but is not required.
** 2. Altered source versions must be plainly marked as such, and must not be
** misrepresented as being the original software.
** 3. This notice may not be removed or altered from any source distribution.
**
** Note: Some of the libraries ClanLib may link to may have additional
** requirements or restrictions.
**
** File Author(s):
**
** Magnus Norddahl
** (if your name is missing here, please add it)
*/
#ifndef header_datafile_inputprovider
#define header_datafile_inputprovider
#if _MSC_VER > 1000
#pragma once
#endif
#include <map>
#include <utility>
#include <zlib.h>
#include "API/Core/IOData/inputsource.h"
#include "API/Core/IOData/inputsource_provider.h"
#include <stack>
class CL_Zipped_Position
{
public:
gzFile gzfile;
int datafile_pos;
int seek_pos;
};
class CL_InputSourceProvider_Datafile;
class CL_InputSource_Datafile : public CL_InputSource
{
protected:
std::string filename;
CL_InputSourceProvider_Datafile *provider;
int objsize;
gzFile gzfile;
int datafile_handle;
int index_open;
char compressed;
int index_pos;
std::stack<CL_Zipped_Position> index_stack;
int seek_pos;
public:
CL_InputSource_Datafile(const std::string &filename, CL_InputSourceProvider_Datafile *provider);
CL_InputSource_Datafile(const CL_InputSource_Datafile *source);
virtual ~CL_InputSource_Datafile();
//: read larger amounts of data (no endian and 64 bit conversion):
//return: num bytes actually read
virtual int read(void *data, int size);
virtual void open();
virtual void close();
//: Make a copy of the current InputSource, standing at the same position.
virtual CL_InputSource *clone() const;
//: Returns current position in input source
virtual int tell() const;
virtual void seek(int pos, SeekEnum seek_type);
//: Returns the size of the input source
virtual int size() const;
virtual void push_position();
virtual void pop_position();
};
class CL_InputSourceProvider_Datafile : public CL_InputSourceProvider
{
public:
CL_InputSourceProvider_Datafile(const std::string &datafile);
CL_InputSourceProvider_Datafile(CL_InputSourceProvider_Datafile *datafile);
virtual ~CL_InputSourceProvider_Datafile();
virtual CL_InputSource *open_source(const std::string &filename);
virtual CL_InputSourceProvider *clone();
virtual std::string get_pathname(const std::string &filename);
virtual CL_InputSourceProvider *create_relative(const std::string &path);
int get_handle() const { return datafile_handle; }
bool lookup_resource(const std::string &resource_id, int &pos, int &size) const
{
return resource_cache->lookup(resource_id, pos, size);
}
protected:
class IndexLocationCache
{
public:
IndexLocationCache() : refcount(1) { ; }
void addref() { refcount++; }
void release()
{
refcount--;
if (!refcount) delete this;
}
bool lookup(const std::string &resource_id, int &data_pos, int &data_size) const
{
std::map<std::string, std::pair<int, int> >::const_iterator it = cache.find(resource_id);
if (it == cache.end())
return false;
data_pos = (*it).second.first;
data_size = (*it).second.second;
return true;
}
void insert(const std::string &resource_id, int data_pos, int data_size)
{
cache.insert(
std::make_pair(
resource_id,
std::make_pair(data_pos, data_size)));
}
private:
int refcount;
std::map<std::string, std::pair<int, int> > cache;
};
IndexLocationCache *resource_cache;
std::string datafile;
int datafile_handle;
void open();
void load_resource_ids();
};
#endif
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