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Define DDT2 header.

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Natalia Portillo
2025-08-03 20:48:30 +01:00
parent 57f5c6e7a4
commit 4b537e60a9
3 changed files with 89 additions and 4 deletions
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42
docs/spec/blocks/ddt2.adoc
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@@ -4,7 +4,47 @@ The deduplication table is a multi-level table of pointers to LBAs contained in
It starts with the following header.
[source,c]
/* Undefined */
typedef struct DdtHeader2
{
/**Identifier, <see cref="BlockType.DeDuplicationTable" /> */
uint32_t identifier;
/**Type of data pointed by this DDT */
uint16_t type;
/**Compression algorithm used to compress the DDT */
uint16_t compression;
/**How many levels of subtables are present */
uint8_t levels;
/**Which level this table belongs to */
uint8_t tableLevel;
/**Pointer to absolute byte offset in file where the previous level table is located */
uint64_t previousLevelOffset;
/**Negative displacement of LBAs */
uint16_t negative;
/**Number of blocks in media */
uint64_t blocks;
/**Positive overflow displacement of LBAs */
uint16_t overflow;
/**First LBA contained in this table */
uint64_t start;
/**Block alignment boundaries */
uint8_t blockAlignmentShift;
/**Data shift */
uint8_t dataShift;
/**Table shift */
uint8_t tableShift;
/**Size type */
uint8_t sizeType;
/**Entries in this table */
uint64_t entries;
/**Compressed length for the DDT */
uint64_t cmpLength;
/**Uncompressed length for the DDT */
uint64_t length;
/**CRC64-ECMA of the compressed DDT */
uint64_t cmpCrc64;
/**CRC64-ECMA of the uncompressed DDT */
uint64_t crc64;
} DdtHeader2;
==== Field Descriptions

2
include/aaruformat/enums.h
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@@ -206,6 +206,8 @@ typedef enum
DataBlock = 0x4B4C4244,
/** Block containing a deduplication table */
DeDuplicationTable = 0x2A544444,
/** Block containing a deduplication table v2 */
DeDuplicationTable2 = 0x32544444,
/** Block containing the index */
IndexBlock = 0x58444E49,
/** Block containing the index v2 */

49
include/aaruformat/structs/ddt.h
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@@ -22,7 +22,8 @@
#pragma pack(push, 1)
/**Header for a deduplication table. Table follows it */
typedef struct DdtHeader {
typedef struct DdtHeader
{
/**Identifier, <see cref="BlockType.DeDuplicationTable" /> */
uint32_t identifier;
/**Type of data pointed by this DDT */
@@ -30,7 +31,7 @@ typedef struct DdtHeader {
/**Compression algorithm used to compress the DDT */
uint16_t compression;
/**Each entry is ((uint8_t offset in file) &lt;&lt; shift) + (sector offset in block) */
uint8_t shift;
uint8_t shift;
/**How many entries are in the table */
uint64_t entries;
/**Compressed length for the DDT */
@@ -43,6 +44,48 @@ typedef struct DdtHeader {
uint64_t crc64;
} DdtHeader;
typedef struct DdtHeader2
{
/**Identifier, <see cref="BlockType.DeDuplicationTable" /> */
uint32_t identifier;
/**Type of data pointed by this DDT */
uint16_t type;
/**Compression algorithm used to compress the DDT */
uint16_t compression;
/**How many levels of subtables are present */
uint8_t levels;
/**Which level this table belongs to */
uint8_t tableLevel;
/**Pointer to absolute byte offset in file where the previous level table is located */
uint64_t previousLevelOffset;
/**Negative displacement of LBAs */
uint16_t negative;
/**Number of blocks in media */
uint64_t blocks;
/**Positive overflow displacement of LBAs */
uint16_t overflow;
/**First LBA contained in this table */
uint64_t start;
/**Block alignment boundaries */
uint8_t blockAlignmentShift;
/**Data shift */
uint8_t dataShift;
/**Table shift */
uint8_t tableShift;
/**Size type */
uint8_t sizeType;
/**Entries in this table */
uint64_t entries;
/**Compressed length for the DDT */
uint64_t cmpLength;
/**Uncompressed length for the DDT */
uint64_t length;
/**CRC64-ECMA of the compressed DDT */
uint64_t cmpCrc64;
/**CRC64-ECMA of the uncompressed DDT */
uint64_t crc64;
} DdtHeader2;
#pragma pack(pop)
#endif //LIBAARUFORMAT_DDT_H
#endif // LIBAARUFORMAT_DDT_H