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#!/bin/bash
ORIGFILE="$1"
is_relative() {
local path="$1"
shift
[ "${path:0:1}" != "/" ]
return
}
set_offsets() {
# This won't work with non-GNU stat.
FILE_SIZE=`stat -L --format "%s" "$1"`
local offset=$(($FILE_SIZE - 4))
MAGIC_OFFSET=$offset
offset=$(($offset - 4))
CHECKSUM_OFFSET=$offset
offset=$(($offset - 4))
VERSION_OFFSET=$offset
offset=$(($offset - 4))
PREPAYLOAD_OFFSET=$offset
offset=$(($offset - 4))
PREPAYLOAD_SIZE_OFFSET=$offset
offset=$(($offset - 4))
LAUNCHER_SIZE_OFFSET=$offset
offset=$(($offset - 4))
PAYLOAD_OFFSET=$offset
offset=$(($offset - 4))
PAYLOAD_SIZE_OFFSET=$offset
offset=$(($offset - 4))
}
set_lengths() {
local file="$1"
if [ ! -s "$file" ]; then
echo "$file does not exist"
exit 1
fi
# XXX: put extraction in its own function
MAGIC_NUMBER=`od -An -t u4 -N 4 -j $MAGIC_OFFSET "$file" | tr -d ' '`
if [ "$MAGIC_NUMBER" != "907380241" ]; then
echo "magic number does not match"
exit 1
fi
LAUNCHER_SIZE=`od -An -t u4 -N 4 -j $LAUNCHER_SIZE_OFFSET "$file" | tr -d ' '`
PAYLOAD_SIZE=`od -An -t u4 -N 4 -j $PAYLOAD_SIZE_OFFSET "$file" | tr -d ' '`
PREPAYLOAD_SIZE=`od -An -t u4 -N 4 -j $PREPAYLOAD_SIZE_OFFSET "$file" | tr -d ' '`
SKIP_BYTES=$(($PREPAYLOAD_SIZE + $LAUNCHER_SIZE))
return 0
}
if is_relative "${ORIGFILE}"; then
ORIGFILE="`pwd`/${ORIGFILE}"
fi
set_offsets ${ORIGFILE}
set_lengths ${ORIGFILE}
echo "Unbundling" ${ORIGFILE}
PREPAYLOAD="prepayload"
PAYLOAD="payload"
# Unpack the pre-payload file
mkdir ${PREPAYLOAD}
cd ${PREPAYLOAD}
dd if="${ORIGFILE}" ibs=$LAUNCHER_SIZE obs=1024 skip=1 | tar -xzf - 2> /dev/null
cd ..
# Unpack the main file
mkdir ${PAYLOAD}
cd ${PAYLOAD}
dd if="${ORIGFILE}" ibs=$SKIP_BYTES obs=1024 skip=1 | tar -xzf - 2> /dev/null
cd ..
|
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