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[PATCH 2/3] iotests: Add poke_file_[bl]e functions
From: |
Max Reitz |
Subject: |
[PATCH 2/3] iotests: Add poke_file_[bl]e functions |
Date: |
Thu, 27 Feb 2020 18:02:50 +0100 |
Similarly to peek_file_[bl]e, we may want to write binary integers into
a file. Currently, this often means messing around with poke_file and
raw binary strings. I hope these functions make it a bit more
comfortable.
Signed-off-by: Max Reitz <address@hidden>
---
tests/qemu-iotests/common.rc | 37 ++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/tests/qemu-iotests/common.rc b/tests/qemu-iotests/common.rc
index 4c246c0450..604f837668 100644
--- a/tests/qemu-iotests/common.rc
+++ b/tests/qemu-iotests/common.rc
@@ -53,6 +53,43 @@ poke_file()
printf "$3" | dd "of=$1" bs=1 "seek=$2" conv=notrunc &>/dev/null
}
+# poke_file_le 'test.img' 512 2 65534
+poke_file_le()
+{
+ local img=$1 ofs=$2 len=$3 val=$4 str=''
+
+ for i in $(seq 0 $((len - 1))); do
+ byte=$((val & 0xff))
+ if [ $byte != 0 ]; then
+ chr="$(printf "\x$(printf %x $byte)")"
+ else
+ chr="\0"
+ fi
+ str+="$chr"
+ val=$((val >> 8))
+ done
+
+ poke_file "$img" "$ofs" "$str"
+}
+
+# poke_file_be 'test.img' 512 2 65279
+poke_file_be()
+{
+ local img=$1 ofs=$2 len=$3 val=$4 str=''
+
+ for i in $(seq 0 $((len - 1))); do
+ byte=$(((val >> ((len - 1 - i) * 8)) & 0xff))
+ if [ $byte != 0 ]; then
+ chr="$(printf "\x$(printf %x $byte)")"
+ else
+ chr="\0"
+ fi
+ str+=$chr
+ done
+
+ poke_file "$img" "$ofs" "$str"
+}
+
# peek_file_le 'test.img' 512 2 => 65534
peek_file_le()
{
--
2.24.1