leb128
Read and write DWARF's “Little Endian Base 128” (LEB128) variable length integer encoding.
The implementation is a direct translation of the pseudocode in the DWARF 4 standard's appendix C.
Either
$ cargo add leb128
or add this to your Cargo.toml:
[dependencies] leb128 = "0.2.1"
use leb128; let mut buf = [0; 1024]; // Write to anything that implements `std::io::Write`. { let mut writable = &mut buf[..]; leb128::write::signed(&mut writable, -12345).expect("Should write number"); } // Read from anything that implements `std::io::Read`. let mut readable = &buf[..]; let val = leb128::read::signed(&mut readable).expect("Should read number"); assert_eq!(val, -12345);
This crate comes with a leb128-repl program that you can use after cargo install leb128 or by running cargo run in clone of this repository.
$ leb128-repl LEB128 Read-Eval-Print-Loop! Converts numbers to signed and unsigned LEB128 and displays the results in base-10, hex, and binary. > 42 # unsigned LEB128 [42] [2a] [00101010] # signed LEB128 [42] [2a] [00101010] > -42 # unsigned LEB128 error # signed LEB128 [86] [56] [01010110] > 9001 # unsigned LEB128 [169, 70] [a9, 46] [10101001, 01000110] # signed LEB128 [169, 198, 0] [a9, c6, 0] [10101001, 11000110, 00000000] > -9001 # unsigned LEB128 error # signed LEB128 [215, 185, 127] [d7, b9, 7f] [11010111, 10111001, 01111111] >
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LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)LICENSE-MIT or https://opensource.org/licenses/MIT)at your option.
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