Struct Header 

pub struct Header {
    pub version: u16,
    pub cache_type: u16,
    pub generation_time: u32,
    pub index_base_address: u32,
    pub index_end_address: u32,
}

Parsed xdb file header (first 16 bytes of meaningful data in the 256-byte header block).

Fields

• version — xdb format version (typically 2)
• cache_type — cache strategy hint
• generation_time — Unix timestamp of database generation
• index_base_address — file offset where segment index starts
• index_end_address — file offset where segment index ends (inclusive)

Example

let data = xdb_parse::load_file("./assets/ip2region_v4.xdb".into())?;
let header = xdb_parse::Header::parse(&data)?;
println!("xdb v{}, generated at {}", header.version, header.generation_time);

Fields

version: u16

cache_type: u16

generation_time: u32

index_base_address: u32

index_end_address: u32

Implementations

impl Header

pub fn parse(data: &[u8]) -> Result<Self, XdbError>

Parse the header from the first bytes of an xdb file.

Reads fields from the header block (offsets 0..16 within the 256-byte header).

pub fn ip_version(&self) -> Result<IpVersion, XdbError>

Detect the IP version by examining the segment index size.

Uses the segment index range (index_end_address - index_base_address) to determine whether segments are 14 bytes (IPv4) or 38 bytes (IPv6).

Trait Implementations

impl Clone for Header

fn clone(&self) -> Header

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Header

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

Formats the value using the given formatter.

impl Default for Header

fn default() -> Header

Returns the “default value” for a type.