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#!/bin/bash
cmd_align-size () {
local aligned
if [ $# -lt 2 ]; then
echo "Usage: $0 <alignment> <size>" >&2
return 2
fi
let "aligned = $2 % $1"
if [ $aligned -eq 0 ]; then
aligned=$2
else
let "aligned = ($2 / $1 + 1) * $1"
fi
echo $aligned
return 0
}
cmd_align-file () {
if [ $# -lt 2 ]; then
echo "Usage: $0 <alignment> <file>" >&2
return 2
fi
truncate -s $("$SELF" align-size "$1" $(stat -c "%s" $2)) "$2"
}
cmd_append-uint32 () {
local a b c d
if [ $# -lt 2 ]; then
echo "Usage: $0 <value> <file>" >&2
return 2
fi
let "a = ($1 & 0xFF000000) >> 24"
let "b = ($1 & 0x00FF0000) >> 16"
let "c = ($1 & 0x0000FF00) >> 8"
let "d = ($1 & 0x000000FF) >> 0"
a=$(printf "%X" $a)
b=$(printf "%X" $b)
c=$(printf "%X" $c)
d=$(printf "%X" $d)
printf "\\x$a\\x$b\\x$c\\x$d" >> "$2"
}
cmd_append-uint16 () {
local a b
if [ $# -lt 2 ]; then
echo "Usage: $0 <value> <file>" >&2
return 2
fi
let "a = ($1 & 0xFF00) >> 8"
let "b = ($1 & 0x00FF) >> 0"
a=$(printf "%X" $a)
b=$(printf "%X" $b)
printf "\\x$a\\x$b" >> "$2"
}
SELF="$0"
cmd="$1"
shift 1
"cmd_$cmd" $@
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