linux: autopatch: Find bytecode and update patch.sh

Have a two-script workflow where one focuses on finding the bytecode in
the driver files, and the other focuses on updating patch.sh using the
newly found bytecode or a previously existing one.

Signed-off-by: Jai Luthra <me@jailuthra.in>

tools/autopatch/find_bytecode.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+
+set -euo pipefail
+
+(( $# == 2 )) || {
+    >&2 echo "Usage: $0 <version> <URL>"
+    exit 2
+}
+
+MATCH_STR=feff85c04189c4
+driver_version=$1
+driver_url=$2
+driver_file=NVIDIA-Linux-x86_64-$driver_version.run
+
+download_driver() {
+    wget -c $driver_url -O $driver_file 1>&2
+    chmod +x $driver_file
+}
+
+extract_driver() {
+    if [[ ! -e ${driver_file%".run"} ]]; then
+        ./$driver_file -x
+    fi
+}
+
+search_bytecode() {
+    nvenc_file=${driver_file%".run"}/libnvidia-encode.so.$driver_version
+    bytecode=$(xxd -c0 -ps $nvenc_file | grep -oP ".{0,6}$MATCH_STR")
+    echo $bytecode
+}
+
+get_patch_str() {
+    bytecode=$1
+    fixed=${bytecode:0:10}29${bytecode:(-8):8}
+    bytecode=$(echo "$bytecode" | sed 's/../\\x&/g')
+    fixed=$(echo "$fixed" | sed 's/../\\x&/g')
+    echo "[\"$driver_version\"]='s/$bytecode/$fixed/g'"
+}
+
+mkdir -p temp
+cd temp
+download_driver
+extract_driver
+get_patch_str $(search_bytecode)
+cd ..