posix-shell: utils: Add hexdiff()

This tool outputs the diff of two hexdumps based on the two files
provided as arguments.

1 files changed, 18 insertions, 0 deletions

diff --git a/posix-shell/utils.sh b/posix-shell/utils.sh
index 4354a37..b21c09b 100644
--- a/posix-shell/utils.sh
+++ b/posix-shell/utils.sh
@@ -258,3 +258,21 @@ lar() {
 	popd
 	rm -rf "$temporary_directory"
 }
+
+hexdiff() {
+	if test "$#" -ne 2
+	then
+		echo "Usage: hexdiff <file1> <file2>"
+		return 1
+	fi
+
+	dump1="$(mktemp)"
+	dump2="$(mktemp)"
+
+	hexdump -C "$1" > "$dump1"
+	hexdump -C "$2" > "$dump2"
+
+	diff --unified=4 --color=always "$dump1" "$dump2"
+
+	rm -f "$dump1" "$dump2"
+}