read_uint40_be

tact_parser::utils

Function read_uint40_be 

Source 
pub fn read_uint40_be(data: &[u8]) -> Result<u64>
Expand description

Read a 40-bit (5-byte) unsigned integer from a byte slice (big-endian)

40-bit integers are used throughout TACT formats for file sizes and offsets. They allow representing values up to 1TB while saving space compared to 64-bit.

§Arguments

  • data - Byte slice containing at least 5 bytes

§Returns

  • The 40-bit value as a u64

§Errors

  • Returns error if data contains less than 5 bytes

§Example

use tact_parser::utils::read_uint40_be;

let data = [0x01, 0x00, 0x00, 0x00, 0x00]; // 4GB file
let value = read_uint40_be(&data).unwrap();
assert_eq!(value, 0x100000000);