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Diffstat (limited to 'lib/raidfile/RaidFileUtil.h')
| -rw-r--r-- | lib/raidfile/RaidFileUtil.h | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/lib/raidfile/RaidFileUtil.h b/lib/raidfile/RaidFileUtil.h new file mode 100644 index 00000000..738663a6 --- /dev/null +++ b/lib/raidfile/RaidFileUtil.h @@ -0,0 +1,135 @@ +// distribution boxbackup-0.10 (svn version: 494) +// +// Copyright (c) 2003 - 2006 +// Ben Summers and contributors. All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions +// are met: +// 1. Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// 2. Redistributions in binary form must reproduce the above copyright +// notice, this list of conditions and the following disclaimer in the +// documentation and/or other materials provided with the distribution. +// 3. All use of this software and associated advertising materials must +// display the following acknowledgment: +// This product includes software developed by Ben Summers. +// 4. The names of the Authors may not be used to endorse or promote +// products derived from this software without specific prior written +// permission. +// +// [Where legally impermissible the Authors do not disclaim liability for +// direct physical injury or death caused solely by defects in the software +// unless it is modified by a third party.] +// +// THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR +// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +// DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, +// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR +// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, +// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN +// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +// POSSIBILITY OF SUCH DAMAGE. +// +// +// +// -------------------------------------------------------------------------- +// +// 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; + + typedef 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 + |