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https://github.com/aaru-dps/libaaruformat.git
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69 lines
3.6 KiB
C
69 lines
3.6 KiB
C
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/*
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* This file is part of the Aaru Data Preservation Suite.
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* Copyright (c) 2019-2026 Natalia Portillo.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef AARUFORMATTOOL_DDT_ALPHA20_H
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#define AARUFORMATTOOL_DDT_ALPHA20_H
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#include <stdint.h>
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#pragma pack(push, 1)
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/**
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* \struct ddt_v2_header_alpha20
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* \brief DDT v2 header structure as it was in alpha20, before modifications.
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*
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* This is a snapshot of the DdtHeader2 structure from alpha20 for use in the
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* upgrade-ddt-to-alpha21 command. This allows the tool to read old format
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* DDT headers while the library uses the newer structure.
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*
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* Original documentation from alpha20:
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* Header preceding a version 2 hierarchical deduplication table.
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*
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* Version 2 introduces multi-level tables to efficiently address very large images by subdividing
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* the logical address space. Tables at higher levels partition regions; leaves contain direct
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* (block, sector) entry mappings. Navigation uses tableLevel (0 = root) and levels (total depth).
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*/
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typedef struct ddt_v2_header_alpha20
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{
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uint32_t identifier; ///< Block identifier, must be BlockType::DeDuplicationTable2.
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uint16_t type; ///< Data classification (DataType) for sectors referenced by this table.
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uint16_t compression; ///< Compression algorithm for this table body (CompressionType).
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uint8_t levels; ///< Total number of hierarchy levels (root depth); > 0.
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uint8_t tableLevel; ///< Zero-based level index of this table (0 = root, increases downward).
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uint64_t previousLevelOffset; ///< Absolute byte offset of the parent (previous) level table; 0 if root.
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uint16_t negative; ///< Leading negative LBA count; added to external L to build internal index.
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uint64_t blocks; ///< Total internal span (negative + usable + overflow) in logical sectors.
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uint16_t overflow; ///< Trailing dumped sectors beyond user area (overflow range), still mapped with entries.
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uint64_t
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start; ///< Base internal index covered by this table (used for secondary tables; currently informational).
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uint8_t blockAlignmentShift; ///< 2^blockAlignmentShift = block alignment boundary in bytes.
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uint8_t dataShift; ///< 2^dataShift = sectors represented per increment in blockIndex field.
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uint8_t tableShift; ///< 2^tableShift = number of logical sectors per primary entry (multi-level only; 0 for
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///< single-level or secondary tables).
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uint64_t entries; ///< Number of entries contained in (uncompressed) table payload.
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uint64_t cmpLength; ///< Compressed payload size in bytes.
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uint64_t length; ///< Uncompressed payload size in bytes.
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uint64_t cmpCrc64; ///< CRC64-ECMA of compressed table payload.
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uint64_t crc64; ///< CRC64-ECMA of uncompressed table payload.
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} ddt_v2_header_alpha20;
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#pragma pack(pop)
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#endif // AARUFORMATTOOL_DDT_ALPHA20_H
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