mirror of
https://github.com/aaru-dps/libaaruformat.git
synced 2025-12-16 19:24:40 +00:00
45 lines
1.1 KiB
Plaintext
45 lines
1.1 KiB
Plaintext
|
=== The index block continuation (`IDXC`)
|
||
|
|
|
||
|
|
The index block continuation follows the same structure and semantics as the index block version 2, with the exception that it includes a pointer to the preceding index block or index block continuation.
|
||
|
|
|
||
|
|
At most, a single index block continuation may appear within any index block structure.
|
||
|
|
|
||
|
|
The purpose of this block is to enable incremental indexing prior to finalizing the image file.
|
||
|
|
This allows new blocks to be indexed as they are written, facilitating partial recovery in the event of application failure.
|
||
|
|
|
||
|
|
The block is immediately followed by index entries formatted identically to those defined in index block version 2.
|
||
|
|
|
||
|
|
==== Structure Definition
|
||
|
|
|
||
|
|
[source,c]
|
||
|
|
/* Undefined */
|
||
|
|
|
||
|
|
==== Field Descriptions
|
||
|
|
|
||
|
|
[cols="2,2,2,6",options="header"]
|
||
|
|
|===
|
||
|
|
|Type
|
||
|
|
|Size
|
||
|
|
|Name
|
||
|
|
|Description
|
||
|
|
|
||
|
|
|uint32
|
||
|
|
|4 bytes
|
||
|
|
|identifier
|
||
|
|
|The index block identifier, always `IDXC`
|
||
|
|
|
||
|
|
|uint64
|
||
|
|
|8 bytes
|
||
|
|
|entries
|
||
|
|
|The number of entries following this header
|
||
|
|
|
||
|
|
|uint64
|
||
|
|
|8 bytes
|
||
|
|
|crc64
|
||
|
|
|CRC64-ECMA checksum of the entries following this header
|
||
|
|
|
||
|
|
|uint64
|
||
|
|
|8 bytes
|
||
|
|
|previous
|
||
|
|
|Pointer in image file to previous index block
|
||
|
|
|===
|