From 9147458c3a380666d34f9579f5f3da2a57261adf Mon Sep 17 00:00:00 2001
From: John Zhao <johnzhao@slightech.com>
Date: Mon, 16 Apr 2018 12:20:31 +0800
Subject: [PATCH] Add checksum tools

---
 tools/README.md          |  8 ++++++
 tools/checksum/md5sum.sh | 57 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+)
 create mode 100755 tools/checksum/md5sum.sh

diff --git a/tools/README.md b/tools/README.md
index 95a475d..f250ccc 100644
--- a/tools/README.md
+++ b/tools/README.md
@@ -70,3 +70,11 @@ python tools/analytics/imu_analytics.py -i mynteye.bag
 ```bash
 python tools/analytics/stamp_analytics.py -i mynteye.bag
 ```
+
+---
+
+## Checksum
+
+```bash
+./tools/checksum/md5sum.sh <file or directory>
+```
diff --git a/tools/checksum/md5sum.sh b/tools/checksum/md5sum.sh
new file mode 100755
index 0000000..697de2a
--- /dev/null
+++ b/tools/checksum/md5sum.sh
@@ -0,0 +1,57 @@
+#!/usr/bin/env bash
+
+BASE_DIR=$(cd "$(dirname "$0")" && pwd)
+ROOT_DIR=$(realpath "$BASE_DIR/../..")
+SCRIPTS_DIR="$ROOT_DIR/scripts"
+
+source "$SCRIPTS_DIR/common/echo.sh"
+source "$SCRIPTS_DIR/common/host.sh"
+
+if [ "$HOST_OS" = "Linux" ]; then
+  MD5SUM="md5sum"
+elif [ "$HOST_OS" = "Mac" ]; then
+  MD5SUM="md5 -q"
+else  # unexpected
+  _echo_e "Unknown host os :("
+  exit 1
+fi
+
+_get_size() {
+PYTHON_ARG="$1" python - <<EOF
+import math
+from os.path import getsize
+
+def convert_size(size_bytes):
+  if size_bytes == 0:
+    return "0B"
+  size_name = ("B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB")
+  i = int(math.floor(math.log(size_bytes, 1024)))
+  p = math.pow(1024, i)
+  s = round(size_bytes / p, 2)
+  return "%s %s" % (s, size_name[i])
+
+import os
+print(convert_size(getsize(os.environ["PYTHON_ARG"])))
+EOF
+}
+
+_print_info() {
+  file="$1"
+  _echo "File: $file"
+  _echo "Size: `_get_size "$file"`"
+  _echo "MD5: `$MD5SUM "$file"`"
+  _echo
+}
+
+if [ $# -eq 0 ]; then
+  _echo_e "Usage: ./tools/checksum/md5sum.sh <file or directory>"
+  exit 1
+fi
+
+if [ -d "$1" ]; then
+  find "$1" -type f | while read -r f; do
+    _print_info "$f"
+  done
+else
+  _print_info "$1"
+fi