move HexDisplay to the traits module

remove the util module

src/lib.rs

@@ -442,12 +442,9 @@ pub mod lib {
 pub use self::bits::*;
 pub use self::internal::*;
 pub use self::traits::*;
-pub use self::util::*;
 
 pub use self::str::*;
 
-#[macro_use]
-mod util;
 
 #[macro_use]
 pub mod error;

src/traits.rs

@@ -1312,6 +1312,84 @@ impl<I> ErrorConvert<error::VerboseError<(I, usize)>> for error::VerboseError<I>
   }
 }
 
+#[cfg(feature = "std")]
+#[cfg_attr(feature = "docsrs", doc(cfg(feature = "std")))]
+/// Helper trait to show a byte slice as a hex dump
+pub trait HexDisplay {
+  /// Converts the value of `self` to a hex dump, returning the owned
+  /// `String`.
+  fn to_hex(&self, chunk_size: usize) -> String;
+
+  /// Converts the value of `self` to a hex dump beginning at `from` address, returning the owned
+  /// `String`.
+  fn to_hex_from(&self, chunk_size: usize, from: usize) -> String;
+}
+
+#[cfg(feature = "std")]
+static CHARS: &[u8] = b"0123456789abcdef";
+
+#[cfg(feature = "std")]
+impl HexDisplay for [u8] {
+  #[allow(unused_variables)]
+  fn to_hex(&self, chunk_size: usize) -> String {
+    self.to_hex_from(chunk_size, 0)
+  }
+
+  #[allow(unused_variables)]
+  fn to_hex_from(&self, chunk_size: usize, from: usize) -> String {
+    let mut v = Vec::with_capacity(self.len() * 3);
+    let mut i = from;
+    for chunk in self.chunks(chunk_size) {
+      let s = format!("{:08x}", i);
+      for &ch in s.as_bytes().iter() {
+        v.push(ch);
+      }
+      v.push(b'\t');
+
+      i += chunk_size;
+
+      for &byte in chunk {
+        v.push(CHARS[(byte >> 4) as usize]);
+        v.push(CHARS[(byte & 0xf) as usize]);
+        v.push(b' ');
+      }
+      if chunk_size > chunk.len() {
+        for j in 0..(chunk_size - chunk.len()) {
+          v.push(b' ');
+          v.push(b' ');
+          v.push(b' ');
+        }
+      }
+      v.push(b'\t');
+
+      for &byte in chunk {
+        if (byte >= 32 && byte <= 126) || byte >= 128 {
+          v.push(byte);
+        } else {
+          v.push(b'.');
+        }
+      }
+      v.push(b'\n');
+    }
+
+    String::from_utf8_lossy(&v[..]).into_owned()
+  }
+}
+
+#[cfg(feature = "std")]
+impl HexDisplay for str {
+  #[allow(unused_variables)]
+  fn to_hex(&self, chunk_size: usize) -> String {
+    self.to_hex_from(chunk_size, 0)
+  }
+
+  #[allow(unused_variables)]
+  fn to_hex_from(&self, chunk_size: usize, from: usize) -> String {
+    self.as_bytes().to_hex_from(chunk_size, from)
+  }
+}
+
+
 #[cfg(test)]
 mod tests {
   use super::*;