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|
#!/bin/bash
#
# Copyright (c) 2014, Sander van Dijk <a.h.vandijk@gmail.com>
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
error() {
echo "$(basename "$0"): $*" >&2
exit 1
}
assert_valid_stdout() {
if test -t 1
then
error "Usage: $(basename "$0") [file ...] > output.pak"
fi
}
assert_valid_file() {
if test ! -e "$1"
then
error "$1: No such file"
fi
if test ! -f "$1"
then
error "$f: Not a regular file"
fi
if test ! -r "$1"
then
error "$1: Permission denied"
fi
if test $(echo -n "$1" | wc -c) -gt 55
then
error "$1: Name too long"
fi
}
assert_valid_int32() {
if test $1 -lt -2147483648 -o $1 -gt 2147483647
then
error "Too much data"
fi
}
octal() {
if test $1 -gt 7
then
octal $(expr $1 / 8)
fi
echo -n $(expr $1 % 8)
}
byte() {
echo -en \\0$(octal $1)
}
little_endian_uint32() {
byte $(expr $1 % 256)
byte $(expr $1 / 256 % 256)
byte $(expr $1 / 65536 % 256)
byte $(expr $1 / 16777216 % 256)
}
little_endian_int32() {
if test $1 -lt 0
then
little_endian_uint32 $(expr $1 + 4294967296)
else
little_endian_uint32 $1
fi
}
zero_padding() {
if test $1 -lt 1
then
return
fi
byte 0
zero_padding $(expr $1 - 1)
}
header() {
echo -n PACK
little_endian_int32 $1
little_endian_int32 $2
}
directory_entry() {
echo -n "$1"
zero_padding $(expr 56 - $(echo -n "$1" | wc -c))
little_endian_int32 $2
little_endian_int32 $3
}
assert_valid_stdout
directory_offset=12
directory_size=0
for file in "$@"
do
assert_valid_file "$file"
file_offset=$directory_offset
assert_valid_int32 $file_offset
file_size=$(wc -c < "$file")
assert_valid_int32 $file_size
directory_offset=$(expr $directory_offset + $file_size)
assert_valid_int32 $directory_offset
directory_size=$(expr $directory_size + 64)
assert_valid_int32 $directory_size
done
header $directory_offset $directory_size
for file in "$@"
do
cat "$file"
done
file_offset=12
for file in "$@"
do
file_size=$(wc -c < "$file")
directory_entry "$file" $file_offset $file_size
file_offset=$(expr $file_offset + $file_size)
done
|
