worldspawn/include/iarchive.h

/*
   Copyright (C) 2001-2006, William Joseph.
   All Rights Reserved.

   This file is part of GtkRadiant.

   GtkRadiant 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.

   GtkRadiant 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 GtkRadiant; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#if !defined( INCLUDED_IARCHIVE_H )
#define INCLUDED_IARCHIVE_H

#include <cstddef>
#include "generic/constant.h"

class InputStream;

/// \brief A file opened in binary mode.
class ArchiveFile
{
public:
virtual ~ArchiveFile() = default;
/// \brief Destroys the file object.
virtual void release() = 0;
/// \brief Returns the size of the file data in bytes.
virtual std::size_t size() const = 0;
/// \brief Returns the path to this file (relative to the filesystem root)
virtual const char* getName() const = 0;
/// \brief Returns the stream associated with this file.
/// Subsequent calls return the same stream.
/// The stream may be read forwards until it is exhausted.
/// The stream remains valid for the lifetime of the file.
virtual InputStream& getInputStream() = 0;
};

class TextInputStream;

/// \brief A file opened in text mode.
class ArchiveTextFile
{
public:
virtual ~ArchiveTextFile() = default;
/// \brief Destroys the file object.
virtual void release() = 0;
/// \brief Returns the stream associated with this file.
/// Subsequent calls return the same stream.
/// The stream may be read forwards until it is exhausted.
/// The stream remains valid for the lifetime of the file.
virtual TextInputStream& getInputStream() = 0;
};

class ScopedArchiveFile
{
ArchiveFile& m_file;
public:
ScopedArchiveFile( ArchiveFile& file ) : m_file( file ){
}
~ScopedArchiveFile(){
	m_file.release();
}
};

class CustomArchiveVisitor;

class Archive
{
public:
virtual ~Archive() = default;

class Visitor
{
public:
virtual void visit( const char* name ) = 0;
};

typedef CustomArchiveVisitor VisitorFunc;

enum EMode
{
	eFiles = 0x01,
	eDirectories = 0x02,
	eFilesAndDirectories = 0x03,
};

/// \brief Destroys the archive object.
/// Any unreleased file object associated with the archive remains valid. */
virtual void release() = 0;
/// \brief Returns a new object associated with the file identified by \p name, or 0 if the file cannot be opened.
/// Name comparisons are case-insensitive.
virtual ArchiveFile* openFile( const char* name ) = 0;
/// \brief Returns a new object associated with the file identified by \p name, or 0 if the file cannot be opened.
/// Name comparisons are case-insensitive.
virtual ArchiveTextFile* openTextFile( const char* name ) = 0;
/// Returns true if the file identified by \p name can be opened.
/// Name comparisons are case-insensitive.
virtual bool containsFile( const char* name ) = 0;
/// \brief Performs a depth-first traversal of the archive tree starting at \p root.
/// Traverses the entire tree if \p root is "".
/// When a file is encountered, calls \c visitor.file passing the file name.
/// When a directory is encountered, calls \c visitor.directory passing the directory name.
/// Skips the directory if \c visitor.directory returned true.
/// Root comparisons are case-insensitive.
/// Names are mixed-case.
virtual void forEachFile( VisitorFunc visitor, const char* root ) = 0;
};

class CustomArchiveVisitor
{
Archive::Visitor* m_visitor;
Archive::EMode m_mode;
std::size_t m_depth;
public:
CustomArchiveVisitor( Archive::Visitor& visitor, Archive::EMode mode, std::size_t depth )
	: m_visitor( &visitor ), m_mode( mode ), m_depth( depth ){
}
void file( const char* name ){
	if ( ( m_mode & Archive::eFiles ) != 0 ) {
		m_visitor->visit( name );
	}
}
bool directory( const char* name, std::size_t depth ){
	if ( ( m_mode & Archive::eDirectories ) != 0 ) {
		m_visitor->visit( name );
	}
	if ( depth == m_depth ) {
		return true;
	}
	return false;
}
};

typedef Archive* ( *PFN_OPENARCHIVE )( const char* name );

class _QERArchiveTable
{
public:
INTEGER_CONSTANT( Version, 1 );
STRING_CONSTANT( Name, "archive" );

PFN_OPENARCHIVE m_pfnOpenArchive;
};

template<typename Type>
class Modules;
typedef Modules<_QERArchiveTable> ArchiveModules;

template<typename Type>
class ModulesRef;
typedef ModulesRef<_QERArchiveTable> ArchiveModulesRef;

#endif