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// --------------------------------------------------------------------------
//
// File
// Name: RaidFileUtil.h
// Purpose: Utilities for the raid file classes
// Created: 2003/07/11
//
// --------------------------------------------------------------------------
#ifndef RAIDFILEUTIL__H
#define RAIDFILEUTIL__H
#include "RaidFileController.h"
#include "RaidFileException.h"
// note: these are hardcoded into the directory searching code
#define RAIDFILE_EXTENSION ".rf"
#define RAIDFILE_WRITE_EXTENSION ".rfw"
// --------------------------------------------------------------------------
//
// Class
// Name: RaidFileUtil
// Purpose: Utility functions for RaidFile classes
// Created: 2003/07/11
//
// --------------------------------------------------------------------------
class RaidFileUtil
{
public:
typedef enum
{
NoFile = 0,
NonRaid = 1,
AsRaid = 2,
AsRaidWithMissingReadable = 3,
AsRaidWithMissingNotRecoverable = 4
} ExistType;
enum
{
Stripe1Exists = 1,
Stripe2Exists = 2,
ParityExists = 4
};
static ExistType RaidFileExists(RaidFileDiscSet &rDiscSet, const std::string &rFilename, int *pStartDisc = 0, int *pExisitingFiles = 0, int64_t *pRevisionID = 0);
static int64_t DiscUsageInBlocks(int64_t FileSize, const RaidFileDiscSet &rDiscSet);
// --------------------------------------------------------------------------
//
// Function
// Name: std::string MakeRaidComponentName(RaidFileDiscSet &, const std::string &, int)
// Purpose: Returns the OS filename for a file of part of a disc set
// Created: 2003/07/11
//
// --------------------------------------------------------------------------
static inline std::string MakeRaidComponentName(RaidFileDiscSet &rDiscSet, const std::string &rFilename, int Disc)
{
if(Disc < 0 || Disc >= (int)rDiscSet.size())
{
THROW_EXCEPTION(RaidFileException, NoSuchDiscSet)
}
std::string r(rDiscSet[Disc]);
r += DIRECTORY_SEPARATOR_ASCHAR;
r += rFilename;
r += RAIDFILE_EXTENSION;
return r;
}
// --------------------------------------------------------------------------
//
// Function
// Name: std::string MakeWriteFileName(RaidFileDiscSet &, const std::string &)
// Purpose: Returns the OS filename for the temporary write file
// Created: 2003/07/11
//
// --------------------------------------------------------------------------
static inline std::string MakeWriteFileName(RaidFileDiscSet &rDiscSet, const std::string &rFilename, int *pOnDiscSet = 0)
{
int livesOnSet = rDiscSet.GetSetNumForWriteFiles(rFilename);
// does the caller want to know which set it's on?
if(pOnDiscSet) *pOnDiscSet = livesOnSet;
// Make the string
std::string r(rDiscSet[livesOnSet]);
r += DIRECTORY_SEPARATOR_ASCHAR;
r += rFilename;
r += RAIDFILE_WRITE_EXTENSION;
return r;
}
};
#endif // RAIDFILEUTIL__H
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