xrpl_std/
lib.rs

1#![no_std]
2
3pub mod core;
4pub mod host;
5pub mod sfield;
6pub mod types;
7
8/// This function is called on panic but only in the WASM architecture. In non-WASM (e.g., in the
9/// Host Simulator) the standard lib is available, which includes a panic handler.
10#[cfg(target_arch = "wasm32")]
11#[panic_handler]
12fn panic(_info: &::core::panic::PanicInfo) -> ! {
13    // This instruction will halt execution of the WASM module.
14    // It's the WASM equivalent of a trap or an unrecoverable error.
15    ::core::arch::wasm32::unreachable();
16}
17
18fn hex_char_to_nibble(c: u8) -> Option<u8> {
19    match c {
20        b'0'..=b'9' => Some(c - b'0'),
21        b'a'..=b'f' => Some(c - b'a' + 10),
22        b'A'..=b'F' => Some(c - b'A' + 10),
23        _ => None,
24    }
25}
26
27pub fn decode_hex_32(hex: &[u8; 64]) -> Option<[u8; 32]> {
28    let mut out = [0u8; 32];
29    let mut i = 0;
30    while i < 32 {
31        let high = hex_char_to_nibble(hex[i * 2])?;
32        let low = hex_char_to_nibble(hex[i * 2 + 1])?;
33        out[i] = (high << 4) | low;
34        i += 1;
35    }
36    Some(out)
37}
xrpl_std/lib.rs

xrpl_std/
lib.rs
