ddt.h

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/*
 * This file is part of the Aaru Data Preservation Suite.
 * Copyright (c) 2019-2025 Natalia Portillo.
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of the
 * License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef LIBAARUFORMAT_DDT_H
#define LIBAARUFORMAT_DDT_H
 
#include <stdint.h>  // fixed-width types for on-disk layout
 
#pragma pack(push, 1)


typedef struct DdtHeader
{
    uint32_t identifier;   
    uint16_t type;         
    uint16_t compression;  
    uint8_t  shift;        
    uint64_t entries;      
    uint64_t cmpLength;    
    uint64_t length;       
    uint64_t cmpCrc64;     
    uint64_t crc64;        
} DdtHeader;

typedef struct DdtHeader2
{
    uint32_t identifier;           
    uint16_t type;                 
    uint16_t compression;          
    uint8_t  levels;               
    uint8_t  tableLevel;           
    uint64_t previousLevelOffset;  
    uint16_t negative;             
    uint64_t blocks;               
    uint16_t overflow;  
    uint64_t
            start;  
    uint8_t blockAlignmentShift;  
    uint8_t dataShift;            
    uint8_t tableShift;  
    uint64_t entries;    
    uint64_t cmpLength;  
    uint64_t length;     
    uint64_t cmpCrc64;   
    uint64_t crc64;      
} DdtHeader2;
 
#pragma pack(pop)
 
#endif  // LIBAARUFORMAT_DDT_H