Struct PackIndex 

pub struct PackIndex {
    pub version: u32,
    pub fan_out: [u32; 256],
    pub object_names: Vec<[u8; 20]>,
    pub crc32_checksums: Vec<u32>,
    pub offsets: Vec<u32>,
    pub large_offsets: Option<Vec<u64>>,
    pub pack_checksum: [u8; 20],
    pub index_checksum: [u8; 20],
    pub raw_data: Vec<u8>,
}

Represents a Git pack index file (.idx)

Pack index files provide efficient lookup into pack files by mapping object SHA-1 hashes to their byte offsets within the corresponding pack file.

Fields

version: u32

Index file format version (should be 2)

fan_out: [u32; 256]

Fan-out table: 256 entries indicating object count for each first byte

object_names: Vec<[u8; 20]>

Sorted array of 20-byte SHA-1 object names

crc32_checksums: Vec<u32>

CRC32 checksums for packed object data (for integrity verification)

offsets: Vec<u32>

4-byte offsets into the pack file for each object

large_offsets: Option<Vec<u64>>

Optional 8-byte offsets for large pack files (when 4-byte offset has MSB set)

pack_checksum: [u8; 20]

SHA-1 checksum of the corresponding pack file

index_checksum: [u8; 20]

SHA-1 checksum of all the index data above

raw_data: Vec<u8>

Raw data for debugging/display purposes

Implementations

impl PackIndex

pub fn parse(input: &[u8]) -> IResult<&[u8], Self>

Parse a pack index file from raw bytes

pub fn object_count(&self) -> usize

Get the total number of objects in this index

pub fn lookup_object(&self, sha1: &[u8; 20]) -> Option<u64>

Look up an object by its SHA-1 hash Returns the offset in the pack file if found

pub fn get_object_offset(&self, index: usize) -> u64

Get the pack file offset for an object at the given index

pub fn get_object_crc32(&self, index: usize) -> Option<u32>

Get the CRC32 checksum for an object at the given index

pub fn verify_checksum(&self) -> Result<(), PackError>

Verify the integrity of the index file

Trait Implementations

impl Clone for PackIndex

fn clone(&self) -> PackIndex

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PackIndex

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for PackIndex

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.