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#!/bin/bash
## \file
# \brief Convenience shell functions for fabrication of Proone executables
# \param 1 The subcommand. One of align-size, align-file, append-uint32 or
# append-uint16
# \param 2 or greator: arguments to the subcommand.
# \note These shell functions are used in the Automake recipe to facilitate
# extra unconventional steps to build Proone executables.
# Copyright (c) 2019-2021 David Timber <mieabby@gmail.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
##
# \brief Align size x to y
# \param 1 The alignment.
# \param 2 The size to align.
# \return The aligned size.
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
}
##
# \brief Align the size of the file using truncate
# \param 1 The alignment.
# \param 2 The path to the file to align.
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"
}
##
# \brief Append a 32-bit unsigned integer to the file, MSB first
# \param 1 The integer value to append
# \param 2 The file to append the integer to
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"
}
##
# \brief Append a 16-bit unsigned integer to the file, MSB first
# \param 1 The integer value to append
# \param 2 The file to append the integer to
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"
}
# Invoke subcommand
SELF="$0"
cmd="$1"
shift 1
"cmd_$cmd" $@
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