trunk/vmware-workstation/unbundle.sh

#!/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 ..

1	#!/bin/bash
2
3	ORIGFILE="$1"
4
5	is_relative() {
6	local path="$1"
7	shift
8
9	[ "${path:0:1}" != "/" ]
10	return
11	}
12
13	set_offsets() {
14	# This won't work with non-GNU stat.
15	FILE_SIZE=`stat -L --format "%s" "$1"`
16	local offset=$(($FILE_SIZE - 4))
17
18	MAGIC_OFFSET=$offset
19	offset=$(($offset - 4))
20
21	CHECKSUM_OFFSET=$offset
22	offset=$(($offset - 4))
23
24	VERSION_OFFSET=$offset
25	offset=$(($offset - 4))
26
27	PREPAYLOAD_OFFSET=$offset
28	offset=$(($offset - 4))
29
30	PREPAYLOAD_SIZE_OFFSET=$offset
31	offset=$(($offset - 4))
32
33	LAUNCHER_SIZE_OFFSET=$offset
34	offset=$(($offset - 4))
35
36	PAYLOAD_OFFSET=$offset
37	offset=$(($offset - 4))
38
39	PAYLOAD_SIZE_OFFSET=$offset
40	offset=$(($offset - 4))
41	}
42
43	set_lengths() {
44	local file="$1"
45	if [ ! -s "$file" ]; then
46	echo "$file does not exist"
47	exit 1
48	fi
49
50	# XXX: put extraction in its own function
51	MAGIC_NUMBER=`od -An -t u4 -N 4 -j $MAGIC_OFFSET "$file" \| tr -d ' '`
52
53	if [ "$MAGIC_NUMBER" != "907380241" ]; then
54	echo "magic number does not match"
55	exit 1
56	fi
57
58	LAUNCHER_SIZE=`od -An -t u4 -N 4 -j $LAUNCHER_SIZE_OFFSET "$file" \| tr -d ' '`
59	PAYLOAD_SIZE=`od -An -t u4 -N 4 -j $PAYLOAD_SIZE_OFFSET "$file" \| tr -d ' '`
60	PREPAYLOAD_SIZE=`od -An -t u4 -N 4 -j $PREPAYLOAD_SIZE_OFFSET "$file" \| tr -d ' '`
61
62	SKIP_BYTES=$(($PREPAYLOAD_SIZE + $LAUNCHER_SIZE))
63
64	return 0
65	}
66
67	if is_relative "${ORIGFILE}"; then
68	ORIGFILE="`pwd`/${ORIGFILE}"
69	fi
70
71
72	set_offsets ${ORIGFILE}
73	set_lengths ${ORIGFILE}
74
75	echo "Unbundling" ${ORIGFILE}
76
77	PREPAYLOAD="prepayload"
78	PAYLOAD="payload"
79
80	# Unpack the pre-payload file
81	mkdir ${PREPAYLOAD}
82	cd ${PREPAYLOAD}
83	dd if="${ORIGFILE}" ibs=$LAUNCHER_SIZE obs=1024 skip=1 \| tar -xzf - 2> /dev/null
84	cd ..
85
86	# Unpack the main file
87	mkdir ${PAYLOAD}
88	cd ${PAYLOAD}
89	dd if="${ORIGFILE}" ibs=$SKIP_BYTES obs=1024 skip=1 \| tar -xzf - 2> /dev/null
90	cd ..
91