itgmania212121/stepmania/src/RageFileManager.cpp

#include "global.h"
#include "RageFileManager.h"
#include "RageFileDriver.h"
#include "RageUtil.h"
#include <errno.h>

RageFileManager *FILEMAN = NULL;

struct LoadedDriver
{
	/* A loaded driver may have a base path, which modifies the path we
	 * pass to the driver.  For example, if the base is "Songs/", and we
	 * want to send the path "Songs/Foo/Bar" to it, then we actually
	 * only send "Foo/Bar".  The path "Themes/Foo" is out of the scope
	 * of the driver, and GetPath returns false. */
	RageFileDriver *driver;
	CString MountPoint;

	CString GetPath( CString path );
};

static vector<LoadedDriver> g_Drivers;


RageFileManager::RageFileManager()
{
#if defined(XBOX)
	RageFileManager::Mount( "dir", ".", "" );
	/* XXX: drop BASE_PATH and do this instead */
//	RageFileManager::Mount( "dir", "D:\\", "" );
#else
	/* Paths relative to the CWD: */
	RageFileManager::Mount( "dir", ".", "" );

	/* Absolute paths.  This is rarely used, eg. by Alsa9Buf::GetSoundCardDebugInfo(). */
	RageFileManager::Mount( "dir", "/", "/" );
#endif

#if defined(WIN32)
	/* Temporary hack for accessing files by drive letter. */
	for( char c = 'A'; c <= 'Z'; ++c )
	{
		const CString path = ssprintf( "%c:/", c );
		RageFileManager::Mount( "dir", path, path );
	}
#endif
}

RageFileManager::~RageFileManager()
{
	/* Note that drivers can use previously-loaded drivers, eg. to load a ZIP
	 * from the FS.  Unload drivers in reverse order. */
	for( int i = g_Drivers.size()-1; i >= 0; --i )
		delete g_Drivers[i].driver;
}

CString LoadedDriver::GetPath( CString path )
{
	/* If the path begins with @, default mount points don't count. */
	const bool Dedicated = ( path.size() && path[0] == '@' );
	if( MountPoint.size() == 0 )
		return Dedicated? "":path;
	
	/* Map all slashes to forward slash. */
	path.Replace( "\\", "/" );

	if( path.Left( MountPoint.size() ).CompareNoCase( MountPoint ) )
		return ""; /* no match */

	return path.Right( path.size() - MountPoint.size() );
}

void RageFileManager::GetDirListing( CString sPath, CStringArray &AddTo, bool bOnlyDirs, bool bReturnPathToo )
{
	for( unsigned i = 0; i < g_Drivers.size(); ++i )
	{
		LoadedDriver &ld = g_Drivers[i];
		const CString p = ld.GetPath( sPath );
		if( p.size() == 0 )
			continue;

		const unsigned OldStart = AddTo.size();
		
		g_Drivers[i].driver->GetDirListing( p, AddTo, bOnlyDirs, bReturnPathToo );

		/* If returning the path, prepend the mountpoint name to the files this driver returned. */
		if( bReturnPathToo )
			for( unsigned j = OldStart; j < AddTo.size(); ++j )
				AddTo[j] = ld.MountPoint + AddTo[j];
	}

}

#include "RageFileDriverDirect.h"
void RageFileManager::Mount( CString Type, CString Root, CString MountPoint )
{
	if( MountPoint.size() && MountPoint.Right(1) != "/" )
		MountPoint += '/';
	ASSERT( Root != "" );
	if( Root.Right(1) != "/" )
		Root += '/';

	RageFileDriver *driver = NULL;
	if( !Type.CompareNoCase("DIR") )
	{
		driver = new RageFileDriverDirect( Root );
	}

	if( !driver )
		return;
	LoadedDriver ld;
	ld.driver = driver;
	ld.MountPoint = MountPoint;
	g_Drivers.push_back( ld );
}

bool RageFileManager::IsMounted( CString MountPoint )
{
	for( unsigned i = 0; i < g_Drivers.size(); ++i )
		if( !g_Drivers[i].MountPoint.CompareNoCase( MountPoint ) )
			return true;

	return false;
}

/* Return true if the driver with the given root path is ready (eg. CD or memory card
 * inserted). */
bool RageFileManager::MountpointIsReady( CString MountPoint )
{
	for( unsigned i = 0; i < g_Drivers.size(); ++i )
	{
		if( g_Drivers[i].MountPoint.CompareNoCase( MountPoint ) )
			continue;

		return g_Drivers[i].driver->Ready();
	}

	return false;
}

RageFileManager::FileType RageFileManager::GetFileType( const CString &sPath )
{
	for( unsigned i = 0; i < g_Drivers.size(); ++i )
	{
		const CString p = g_Drivers[i].GetPath( sPath );
		if( p.size() == 0 )
			continue;
		FileType ret = g_Drivers[i].driver->GetFileType( p );
		if( ret != TYPE_NONE )
			return ret;
	}

	return TYPE_NONE;
}


int RageFileManager::GetFileSizeInBytes( const CString &sPath )
{
	for( unsigned i = 0; i < g_Drivers.size(); ++i )
	{
		const CString p = g_Drivers[i].GetPath( sPath );
		if( p.size() == 0 )
			continue;
		int ret = g_Drivers[i].driver->GetFileSizeInBytes( p );
		if( ret != -1 )
			return ret;
	}

	return -1;
}

int RageFileManager::GetFileModTime( const CString &sPath )
{
	for( unsigned i = 0; i < g_Drivers.size(); ++i )
	{
		const CString p = g_Drivers[i].GetPath( sPath );
		if( p.size() == 0 )
			continue;
		int ret = g_Drivers[i].driver->GetFileModTime( p );
		if( ret != -1 )
			return ret;
	}

	return -1;

}

static bool SortBySecond( const pair<int,int> &a, const pair<int,int> &b )
{
	return a.second < b.second;
}

/* Used only by RageFile: */
RageFileObj *RageFileManager::Open( const CString &sPath, RageFile::OpenMode mode, RageFile &p, int &err )
{
	err = ENOENT;

	/* If writing, we need to do a heuristic to figure out which driver to write with--there
	 * may be several that will work. */
	if( mode == RageFile::WRITE )
		return OpenForWriting( sPath, mode, p, err );

	/* XXX: WRITE logic */
	for( unsigned i = 0; i < g_Drivers.size(); ++i )
	{
		const CString path = g_Drivers[i].GetPath( sPath );
		if( path.size() == 0 )
			continue;
		int error;
		RageFileObj *ret = g_Drivers[i].driver->Open( path, mode, p, error );
		if( ret )
			return ret;

		/* ENOENT (File not found) is low-priority: if some other error
		 * was reported, return that instead. */
		if( error != ENOENT )
			err = error;
	}

	return NULL;
}

RageFileObj *RageFileManager::OpenForWriting( const CString &sPath, RageFile::OpenMode mode, RageFile &p, int &err )
{
	/*
	 * The value for a driver to open a file is the number of directories and/or files
	 * that would have to be created in order to write it, or 0 if the file already exists.
	 * For example, if we're opening "foo/bar/baz.txt", and only "foo/" exists in a
	 * driver, we'd have to create the "bar" directory and the "baz.txt" file, so the
	 * value is 2.  If "foo/bar/" exists, we'd only have to create the file, so the
	 * value is 1.  Create the file with the driver that returns the lowest value;
	 * in case of a tie, earliest-loaded driver wins.
	 *
	 * The purpose of this is to create files in the expected place.  For example, if we
	 * have both C:/games/StepMania and C:/games/DWI loaded, and we're writing
	 * "Songs/Music/Waltz/waltz.sm", and the song was loaded out of
	 * "C:/games/DWI/Songs/Music/Waltz/waltz.dwi", we want to write the new SM into the
	 * same directory (if possible).  Don't split up files in the same directory any
	 * more than we have to.
	 *
	 * If the given path can not be created, return -1.  This happens if a path
	 * that needs to be a directory is a file, or vice versa.
	 */
	vector< pair<int,int> > Values;
	unsigned i;
	for( i = 0; i < g_Drivers.size(); ++i )
	{
		LoadedDriver &ld = g_Drivers[i];
		const CString path = ld.GetPath( sPath );
		if( path.size() == 0 )
			continue;

		const int value = ld.driver->GetPathValue( path );
		if( value == -1 )
			continue;

		Values.push_back( pair<int,int>( i, value ) );
	}

	if( !Values.size() )
	{
		err = EEXIST;
		return NULL;
	}

	stable_sort( Values.begin(), Values.end(), SortBySecond );

	int error = 0;
	for( i = 0; i < Values.size(); ++i )
	{
		const int driver = Values[i].first;
		LoadedDriver &ld = g_Drivers[driver];
		const CString path = ld.GetPath( sPath );
		ASSERT( path.size() );

		RageFileObj *ret = ld.driver->Open( path, mode, p, error );
		if( ret )
			return ret;
	}
	err = error;
	return NULL;
}

bool RageFileManager::IsAFile( const CString &sPath ) { return GetFileType(sPath) == TYPE_FILE; }
bool RageFileManager::IsADirectory( const CString &sPath ) { return GetFileType(sPath) == TYPE_DIR; }
bool RageFileManager::DoesFileExist( const CString &sPath ) { return GetFileType(sPath) != TYPE_NONE; }