Render a pretty hexdump in the logs

src/error.rs

@@ -0,0 +1,27 @@
+use nom::error::Error;
+use nom::Err;
+use pretty_hex::pretty_hex;
+
+fn error_to_string(e: Error<&[u8]>) -> String {
+    format!(
+        "parsing error: {:?}: input:{}",
+        e.code,
+        get_pretty_hex(&e.input)
+    )
+}
+
+pub(crate) fn get_pretty_hex(input: &[u8]) -> String {
+    let mut s = String::new();
+    for l in pretty_hex(&input).split('\n') {
+        s += &format!("\n{}", l);
+    }
+    s
+}
+
+pub(crate) fn nom_err_to_string(e: Err<Error<&[u8]>>) -> String {
+    match e {
+        Err::Incomplete(_) => e.to_string(),
+        Err::Error(er) => error_to_string(er),
+        Err::Failure(er) => error_to_string(er),
+    }
+}