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Sync specification with code.

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Natalia Portillo
2025-10-11 13:17:26 +01:00
parent 1f33de2ccf
commit e2f3323a04
17 changed files with 188 additions and 275 deletions
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27
docs/spec/blocks/ddt.adoc
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@@ -13,24 +13,15 @@ Every image must include at least one deduplication table of type `UserData`.
/**Header for a deduplication table. Table follows it */
typedef struct DdtHeader
{
/**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;
/**Each entry is ((uint8_t offset in file) &lt;&lt; shift) + (sector offset in block) */
uint8_t shift;
/**How many entries are in the 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;
uint32_t identifier; ///< Block identifier, must be BlockType::DeDuplicationTable.
uint16_t type; ///< Data classification (\ref DataType) for sectors referenced by this table.
uint16_t compression; ///< Compression algorithm for the table body (\ref CompressionType).
uint8_t shift; ///< Left shift applied to per-entry file offset component forming logicalEntryValue.
uint64_t entries; ///< Number of deduplication entries contained in (uncompressed) table.
uint64_t cmpLength; ///< Size in bytes of compressed entries payload.
uint64_t length; ///< Size in bytes of uncompressed entries payload.
uint64_t cmpCrc64; ///< CRC64-ECMA of the compressed payload.
uint64_t crc64; ///< CRC64-ECMA of the uncompressed payload.
} DdtHeader;
==== Field Descriptions