Add helper for pretty printing data

src/dump.rs

@@ -0,0 +1,41 @@
+use std::cmp;
+use std::fmt::Write;
+
+#[allow(dead_code)]
+fn dump(data: &[u8]) -> String {
+    let mut output = String::new();
+
+    if data.is_empty() {
+        output.push_str("\t--- Empty ---");
+    }
+
+    for i in (0..data.len()).step_by(16) {
+        let to_print = cmp::min(16, data.len() - i);
+        let to_pad = 16 - to_print;
+        let data = &data[i..i + to_print];
+
+        let _ = write!(output, "    {:08x}", i);
+
+        for byte in data {
+            let _ = write!(output, " {:02x}", byte);
+        }
+
+        for _ in 0..to_pad {
+            output.push_str("   ");
+        }
+
+        output.push(' ');
+        output.extend(data.iter().map(|&c| {
+            if c < 0x20 || c >= 0x7f {
+                '.'
+            } else {
+                c as char
+            }
+        }));
+        output.push('\n');
+    }
+
+    output.push('\n');
+
+    output
+}

src/lib.rs

@@ -19,6 +19,7 @@ use std::str;
 use libc::RTLD_NEXT;
 use serde::Deserialize;
 
+mod dump;
 mod format;
 mod log;