arch_program 0.6.4

A Rust library for building programs that run inside the Arch Virtual Machine. Provides core functionality for creating instructions, managing accounts, handling program errors, and interacting with the Arch runtime environment. Includes utilities for logging, transaction handling, and Bitcoin UTXO management.
Documentation 
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//! Debug-formatting of utxo data.

use std::{cmp, fmt};

pub(crate) const MAX_DEBUG_UTXO_DATA: usize = 64;

/// Format data as hex.
///
/// If `data`'s length is greater than 0, add a field called "data" to `f`. The
/// first 64 bytes of `data` is displayed; bytes after that are ignored.
pub fn debug_account_data(data: &[u8], f: &mut fmt::DebugStruct<'_, '_>) {
    let data_len = cmp::min(MAX_DEBUG_UTXO_DATA, data.len());
    if data_len > 0 {
        f.field("data", &Hex(&data[..data_len]));
    }
}

pub(crate) struct Hex<'a>(pub(crate) &'a [u8]);
impl fmt::Debug for Hex<'_> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        for &byte in self.0 {
            write!(f, "{byte:02x}")?;
        }
        Ok(())
    }
}