Method read_from

atomic-core/src/change/format_v3/hash_table.rs:624–638

Read a hash table from a reader. Reads `count × 32` bytes and reconstructs the table with bidirectional lookup support. The first hash read becomes index 0 (the self hash). # Arguments `reader` - The source reader, positioned at the start of the hash table. `count` - Number of hash entries to read (from the file header's `hash_table_entries` field). # Errors - I/O error if fewer than `count ×

(reader: &mut R, count: u32)

    /// assert_eq!(loaded.resolve(0).unwrap(), &[42u8; 32]);
    /// ```
    pub fn read_from<R: Read>(reader: &mut R, count: u32) -> FormatResult<Self> {
        if count as usize > MAX_HASH_TABLE_ENTRIES {
            return Err(FormatError::HashTableFull);
        }

        let mut hashes = Vec::with_capacity(count as usize);
        let mut buf = [0u8; HASH_SIZE];

        for _ in 0..count {
            reader.read_exact(&mut buf)?;
            hashes.push(buf);
        }

        Self::from_hashes(hashes)
    }

    /// Merge another set of hashes into this table.
    ///