fix: add padding to the last line if it has less than 16 bytes

src/lib.rs

@@ -1,3 +1,4 @@
+#[inline(always)]
 fn print_printable_or_dot(chunk: &[u8]) {
     for (idx, byte) in chunk.iter().enumerate() {
         if idx > 0 && idx % 8 == 0 {
@@ -12,10 +13,12 @@ fn print_printable_or_dot(chunk: &[u8]) {
     }
 }
 
+#[inline(always)]
 fn print_offset(offset: usize) {
     print!("{:08x}  ", offset);
 }
 
+#[inline(always)]
 fn print_data_hex(chunk: &[u8]) {
     for (idx, byte) in chunk.iter().enumerate() {
         if idx > 0 && idx % 8 == 0 {
@@ -25,6 +28,25 @@ fn print_data_hex(chunk: &[u8]) {
     }
 }
 
+#[inline(always)]
+fn print_padding(chunk_len: usize) {
+    // only needs padding if we have less than 16 bytes to show
+    if chunk_len >= 16 {
+        return;
+    }
+
+    // padding is 3 spaces per missing byte
+    for _ in 0..(16 - chunk_len) {
+        print!("   ");
+    }
+
+    // if 8 or more bytes are missing we also need pad the space between
+    // 8-bytes left and 8-bytes right
+    if chunk_len <= 8 {
+        print!("  ");
+    }
+}
+
 pub fn print_hex(data: &[u8]) {
     let mut offset = 0usize;
 
@@ -33,6 +55,7 @@ pub fn print_hex(data: &[u8]) {
     for chunk in chunks {
         print_offset(offset);
         print_data_hex(chunk);
+        print_padding(chunk.len());
         print_printable_or_dot(chunk);
         println!();
         offset += 16;