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iotests: Add poke_file_[bl]e functions 

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 <mreitz@redhat.com>
Code-suggested-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200324172757.1173824-3-mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2020-03-24 18:27:56 +01:00
parent 1656324ec0
commit 2f8bb28ff0
1 changed files with 24 additions and 0 deletions
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24
tests/qemu-iotests/common.rc
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@ -53,6 +53,30 @@ poke_file()
printf "$3" | dd "of=$1" bs=1 "seek=$2" conv=notrunc &>/dev/null
}
# poke_file_le $img_filename $offset $byte_width $value
# Example: poke_file_le "$TEST_IMG" 512 2 65534
poke_file_le()
{
local img=$1 ofs=$2 len=$3 val=$4 str=''
while ((len--)); do
str+=$(printf '\\x%02x' $((val & 0xff)))
val=$((val >> 8))
done
poke_file "$img" "$ofs" "$str"
}
# poke_file_be $img_filename $offset $byte_width $value
# Example: poke_file_be "$TEST_IMG" 512 2 65279
poke_file_be()
{
local img=$1 ofs=$2 len=$3 val=$4
local str=$(printf "%0$((len * 2))x\n" $val | sed 's/\(..\)/\\x\1/g')
poke_file "$img" "$ofs" "$str"
}
# peek_file_le 'test.img' 512 2 => 65534
peek_file_le()
{