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// --------------------------------------------------------------------------
//
// File
// Name: BackupStoreFileWire.h
// Purpose: On the wire / disc formats for backup store files
// Created: 12/1/04
//
// --------------------------------------------------------------------------
#ifndef BACKUPSTOREFILEWIRE__H
#define BACKUPSTOREFILEWIRE__H
#include "MD5Digest.h"
// set packing to one byte
#ifdef STRUCTURE_PACKING_FOR_WIRE_USE_HEADERS
#include "BeginStructPackForWire.h"
#else
BEGIN_STRUCTURE_PACKING_FOR_WIRE
#endif
typedef struct
{
int32_t mMagicValue; // also the version number
int64_t mNumBlocks; // number of blocks contained in the file
int64_t mContainerID;
int64_t mModificationTime;
int32_t mMaxBlockClearSize; // Maximum clear size that can be expected for a block
int32_t mOptions; // bitmask of options used
// Then a BackupStoreFilename
// Then a BackupClientFileAttributes
} file_StreamFormat;
typedef struct
{
int32_t mMagicValue; // different magic value
int64_t mOtherFileID; // the file ID of the 'other' file which may be referenced by the index
uint64_t mEntryIVBase; // base value for block IV
int64_t mNumBlocks; // repeat of value in file header
} file_BlockIndexHeader;
typedef struct
{
int32_t mSize; // size in clear
uint32_t mWeakChecksum; // weak, rolling checksum
uint8_t mStrongChecksum[MD5Digest::DigestLength]; // strong digest based checksum
} file_BlockIndexEntryEnc;
typedef struct
{
union
{
int64_t mEncodedSize; // size encoded, if > 0
int64_t mOtherBlockIndex; // 0 - block number in other file, if <= 0
};
uint8_t mEnEnc[sizeof(file_BlockIndexEntryEnc)]; // Encoded section
} file_BlockIndexEntry;
// Use default packing
#ifdef STRUCTURE_PACKING_FOR_WIRE_USE_HEADERS
#include "EndStructPackForWire.h"
#else
END_STRUCTURE_PACKING_FOR_WIRE
#endif
// header for blocks of compressed data in files
#define HEADER_CHUNK_IS_COMPRESSED 1 // bit
#define HEADER_ENCODING_SHIFT 1 // shift value
#define HEADER_BLOWFISH_ENCODING 1 // value stored in bits 1 -- 7
#define HEADER_AES_ENCODING 2 // value stored in bits 1 -- 7
#endif // BACKUPSTOREFILEWIRE__H
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