From b59e0d2f5e4088300b5eb2a736451eadcd1c5c53 Mon Sep 17 00:00:00 2001
From: Shannon Appelcline <shannon.appelcline@gmail.com>
Date: Tue, 20 Oct 2020 13:09:43 -1000
Subject: [PATCH] Create 10_2_integer2lehex.sh

---
 src/10_2_integer2lehex.sh | 42 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 src/10_2_integer2lehex.sh

diff --git a/src/10_2_integer2lehex.sh b/src/10_2_integer2lehex.sh
new file mode 100644
index 0000000..9a397ab
--- /dev/null
+++ b/src/10_2_integer2lehex.sh
@@ -0,0 +1,42 @@
+#!/bin/bash
+
+if [ -z $1 ];
+then
+    echo "You must include an integer as an argument.";
+    exit;
+fi
+
+if (( $1 > "2147483647" )) || (( $1 < "-2147483647" ));
+then
+    echo "Your number ($1) must be between -2147483647 and 2147483647";
+    exit;
+fi
+
+if [ $1 -lt 0 ];
+then
+    integer=$(echo $((-$1)));
+    negative=1;
+else
+    integer=$1;
+    negative=0;
+fi
+
+hex=$(printf '%08x\n' $integer | sed 's/^\(00\)*//');
+
+hexfirst=$(echo $hex | cut -c1)
+[[ 0x$hexfirst -gt 0x7 ]] && hex="00"$hex
+
+lehex=$(echo $hex | tac -rs .. | echo "$(tr -d '\n')");
+
+if [ "$negative" -eq "1" ];
+then
+   lehex=$(printf '%x\n' $((0x$lehex | 0x80)))
+fi
+
+size=$(echo -n $lehex | wc -c | awk '{print $1/2}');
+hexcodeprefix=$(printf '%02x\n' $size);
+
+echo "Integer: $1";
+echo "LE Hex: $lehex";
+echo "Length: $size bytes";
+echo "Hexcode: $hexcodeprefix$lehex";