Struct SourceStamp 

pub struct SourceStamp {
    pub files: u32,
    pub bytes: u64,
    pub hash: u64,
}

Which copy of a star database an index was built from, so a later check can tell whether the database has changed since (a new ASTAP release, a re-download, a different directory’s files).

The fingerprint covers each database file’s name, size and first SourceStamp::HEAD_BYTES bytes, not its modification time: copying a database to another disk changes every mtime without changing a star. All zero when not recorded (indexes built before the stamp existed).

Fields

files: u32

Number of database files.

bytes: u64

Their total size in bytes.

hash: u64

FNV-1a over every file’s name, size and head, in name order.

Implementations

impl SourceStamp

pub const HEAD_BYTES: usize = 4096

Bytes of each file’s head folded into the hash.

pub fn is_recorded(&self) -> bool

Whether the index recorded its source at all.

pub fn of_database(db_path: &Path, db_name: &str) -> Result<Self>

Fingerprint the files of database db_name in db_path: every <db_name>_*.{1476,290,001}. Reads a few kilobytes per file.

Errors

ArcsecError::CatalogIo if the directory or a file cannot be read.

Trait Implementations

impl Clone for SourceStamp

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SourceStamp

impl Debug for SourceStamp

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

Formats the value using the given formatter.

impl Default for SourceStamp

fn default() -> Self

Returns the “default value” for a type.

impl Eq for SourceStamp

impl PartialEq for SourceStamp

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for SourceStamp