root / image_creator / gpt.py @ bf3a282c
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1 | 331aa0ec | Nikos Skalkotos | # Copyright 2012 GRNET S.A. All rights reserved.
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2 | 331aa0ec | Nikos Skalkotos | #
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3 | 331aa0ec | Nikos Skalkotos | # Redistribution and use in source and binary forms, with or
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4 | 331aa0ec | Nikos Skalkotos | # without modification, are permitted provided that the following
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5 | 331aa0ec | Nikos Skalkotos | # conditions are met:
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6 | 331aa0ec | Nikos Skalkotos | #
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7 | 331aa0ec | Nikos Skalkotos | # 1. Redistributions of source code must retain the above
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8 | 331aa0ec | Nikos Skalkotos | # copyright notice, this list of conditions and the following
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9 | 331aa0ec | Nikos Skalkotos | # disclaimer.
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10 | 331aa0ec | Nikos Skalkotos | #
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11 | 331aa0ec | Nikos Skalkotos | # 2. Redistributions in binary form must reproduce the above
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12 | 331aa0ec | Nikos Skalkotos | # copyright notice, this list of conditions and the following
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13 | 331aa0ec | Nikos Skalkotos | # disclaimer in the documentation and/or other materials
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14 | 331aa0ec | Nikos Skalkotos | # provided with the distribution.
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15 | 331aa0ec | Nikos Skalkotos | #
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16 | 331aa0ec | Nikos Skalkotos | # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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17 | 331aa0ec | Nikos Skalkotos | # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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18 | 331aa0ec | Nikos Skalkotos | # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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19 | 331aa0ec | Nikos Skalkotos | # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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20 | 331aa0ec | Nikos Skalkotos | # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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21 | 331aa0ec | Nikos Skalkotos | # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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22 | 331aa0ec | Nikos Skalkotos | # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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23 | 331aa0ec | Nikos Skalkotos | # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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24 | 331aa0ec | Nikos Skalkotos | # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | 331aa0ec | Nikos Skalkotos | # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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26 | 331aa0ec | Nikos Skalkotos | # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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27 | 331aa0ec | Nikos Skalkotos | # POSSIBILITY OF SUCH DAMAGE.
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28 | 331aa0ec | Nikos Skalkotos | #
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29 | 331aa0ec | Nikos Skalkotos | # The views and conclusions contained in the software and
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30 | 331aa0ec | Nikos Skalkotos | # documentation are those of the authors and should not be
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31 | 331aa0ec | Nikos Skalkotos | # interpreted as representing official policies, either expressed
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32 | 331aa0ec | Nikos Skalkotos | # or implied, of GRNET S.A.
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33 | 331aa0ec | Nikos Skalkotos | |
34 | 331aa0ec | Nikos Skalkotos | import struct |
35 | 331aa0ec | Nikos Skalkotos | import sys |
36 | 331aa0ec | Nikos Skalkotos | import uuid |
37 | 331aa0ec | Nikos Skalkotos | import binascii |
38 | 331aa0ec | Nikos Skalkotos | |
39 | 331aa0ec | Nikos Skalkotos | BLOCKSIZE = 512
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40 | 331aa0ec | Nikos Skalkotos | |
41 | 331aa0ec | Nikos Skalkotos | |
42 | 331aa0ec | Nikos Skalkotos | class MBR(object): |
43 | c0240ac1 | Nikos Skalkotos | """Represents a Master Boot Record."""
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44 | 331aa0ec | Nikos Skalkotos | class Partition(object): |
45 | 88f83027 | Nikos Skalkotos | """Represents a partition entry in MBR"""
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46 | 331aa0ec | Nikos Skalkotos | format = "<B3sB3sLL"
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47 | 331aa0ec | Nikos Skalkotos | |
48 | 331aa0ec | Nikos Skalkotos | def __init__(self, raw_part): |
49 | 88f83027 | Nikos Skalkotos | """Create a Partition instance"""
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50 | c0240ac1 | Nikos Skalkotos | ( |
51 | c0240ac1 | Nikos Skalkotos | self.status,
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52 | 331aa0ec | Nikos Skalkotos | self.start,
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53 | 331aa0ec | Nikos Skalkotos | self.type,
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54 | 331aa0ec | Nikos Skalkotos | self.end,
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55 | 331aa0ec | Nikos Skalkotos | self.first_sector,
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56 | 331aa0ec | Nikos Skalkotos | self.sector_count
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57 | 331aa0ec | Nikos Skalkotos | ) = struct.unpack(self.format, raw_part)
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58 | 331aa0ec | Nikos Skalkotos | |
59 | 331aa0ec | Nikos Skalkotos | def pack(self): |
60 | 88f83027 | Nikos Skalkotos | """Pack the partition values into a binary string"""
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61 | 331aa0ec | Nikos Skalkotos | return struct.pack(self.format, |
62 | f99fe99d | Nikos Skalkotos | self.status,
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63 | f99fe99d | Nikos Skalkotos | self.start,
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64 | f99fe99d | Nikos Skalkotos | self.type,
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65 | f99fe99d | Nikos Skalkotos | self.end,
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66 | f99fe99d | Nikos Skalkotos | self.first_sector,
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67 | f99fe99d | Nikos Skalkotos | self.sector_count)
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68 | 331aa0ec | Nikos Skalkotos | |
69 | c0240ac1 | Nikos Skalkotos | @staticmethod
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70 | c0240ac1 | Nikos Skalkotos | def size(): |
71 | c0240ac1 | Nikos Skalkotos | """Returns the size of an MBR partition entry"""
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72 | c0240ac1 | Nikos Skalkotos | return struct.calcsize(MBR.Partition.format)
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73 | c0240ac1 | Nikos Skalkotos | |
74 | c0240ac1 | Nikos Skalkotos | def __str__(self): |
75 | 331aa0ec | Nikos Skalkotos | start = self.unpack_chs(self.start) |
76 | 331aa0ec | Nikos Skalkotos | end = self.unpack_chs(self.end) |
77 | c0240ac1 | Nikos Skalkotos | return "%d %s %d %s %d %d" % (self.status, start, self.type, end, |
78 | f99fe99d | Nikos Skalkotos | self.first_sector, self.sector_count) |
79 | 331aa0ec | Nikos Skalkotos | |
80 | 331aa0ec | Nikos Skalkotos | def unpack_chs(self, chs): |
81 | c0240ac1 | Nikos Skalkotos | """Unpacks a CHS address string to a tuple."""
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82 | 331aa0ec | Nikos Skalkotos | |
83 | 331aa0ec | Nikos Skalkotos | assert len(chs) == 3 |
84 | 331aa0ec | Nikos Skalkotos | |
85 | 331aa0ec | Nikos Skalkotos | head = struct.unpack('<B', chs[0])[0] |
86 | 331aa0ec | Nikos Skalkotos | sector = struct.unpack('<B', chs[1])[0] & 0x3f |
87 | 331aa0ec | Nikos Skalkotos | cylinder = (struct.unpack('<B', chs[1])[0] & 0xC0) << 2 | \ |
88 | 331aa0ec | Nikos Skalkotos | struct.unpack('<B', chs[2])[0] |
89 | 331aa0ec | Nikos Skalkotos | |
90 | 331aa0ec | Nikos Skalkotos | return (cylinder, head, sector)
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91 | 331aa0ec | Nikos Skalkotos | |
92 | 331aa0ec | Nikos Skalkotos | def pack_chs(self, cylinder, head, sector): |
93 | c0240ac1 | Nikos Skalkotos | """Packs a CHS tuple to an address string."""
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94 | 331aa0ec | Nikos Skalkotos | |
95 | 331aa0ec | Nikos Skalkotos | assert 1 <= sector <= 63 |
96 | 331aa0ec | Nikos Skalkotos | assert 0 <= cylinder <= 1023 |
97 | 331aa0ec | Nikos Skalkotos | assert 0 <= head <= 255 |
98 | 331aa0ec | Nikos Skalkotos | |
99 | 331aa0ec | Nikos Skalkotos | byte0 = head |
100 | 331aa0ec | Nikos Skalkotos | byte1 = (cylinder >> 2) & 0xC0 | sector |
101 | 331aa0ec | Nikos Skalkotos | byte2 = cylinder & 0xff
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102 | 331aa0ec | Nikos Skalkotos | |
103 | 331aa0ec | Nikos Skalkotos | return struct.pack('<BBB', byte0, byte1, byte2) |
104 | 331aa0ec | Nikos Skalkotos | |
105 | 331aa0ec | Nikos Skalkotos | format = "<444s2x16s16s16s16s2s"
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106 | 331aa0ec | Nikos Skalkotos | """
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107 | 331aa0ec | Nikos Skalkotos | Offset Length Contents
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108 | 331aa0ec | Nikos Skalkotos | 0 440(max. 446) code area
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109 | 331aa0ec | Nikos Skalkotos | 440 2(optional) disk signature
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110 | 331aa0ec | Nikos Skalkotos | 444 2 Usually nulls
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111 | 331aa0ec | Nikos Skalkotos | 446 16 Partition 0
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112 | 331aa0ec | Nikos Skalkotos | 462 16 Partition 1
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113 | 331aa0ec | Nikos Skalkotos | 478 16 Partition 2
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114 | 331aa0ec | Nikos Skalkotos | 494 16 Partition 3
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115 | 331aa0ec | Nikos Skalkotos | 510 2 MBR signature
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116 | 331aa0ec | Nikos Skalkotos | """
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117 | 331aa0ec | Nikos Skalkotos | def __init__(self, block): |
118 | 88f83027 | Nikos Skalkotos | """Create an MBR instance"""
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119 | 331aa0ec | Nikos Skalkotos | raw_part = {} |
120 | f99fe99d | Nikos Skalkotos | (self.code_area,
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121 | f99fe99d | Nikos Skalkotos | raw_part[0],
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122 | f99fe99d | Nikos Skalkotos | raw_part[1],
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123 | f99fe99d | Nikos Skalkotos | raw_part[2],
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124 | f99fe99d | Nikos Skalkotos | raw_part[3],
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125 | f99fe99d | Nikos Skalkotos | self.signature) = struct.unpack(self.format, block) |
126 | 331aa0ec | Nikos Skalkotos | |
127 | 331aa0ec | Nikos Skalkotos | self.part = {}
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128 | 331aa0ec | Nikos Skalkotos | for i in range(4): |
129 | 331aa0ec | Nikos Skalkotos | self.part[i] = self.Partition(raw_part[i]) |
130 | 331aa0ec | Nikos Skalkotos | |
131 | c0240ac1 | Nikos Skalkotos | @staticmethod
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132 | c0240ac1 | Nikos Skalkotos | def size(): |
133 | 88f83027 | Nikos Skalkotos | """Return the size of a Master Boot Record."""
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134 | c0240ac1 | Nikos Skalkotos | return struct.calcsize(MBR.format)
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135 | c0240ac1 | Nikos Skalkotos | |
136 | 331aa0ec | Nikos Skalkotos | def pack(self): |
137 | 88f83027 | Nikos Skalkotos | """Pack an MBR to a binary string."""
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138 | 331aa0ec | Nikos Skalkotos | return struct.pack(self.format, |
139 | f99fe99d | Nikos Skalkotos | self.code_area,
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140 | f99fe99d | Nikos Skalkotos | self.part[0].pack(), |
141 | f99fe99d | Nikos Skalkotos | self.part[1].pack(), |
142 | f99fe99d | Nikos Skalkotos | self.part[2].pack(), |
143 | f99fe99d | Nikos Skalkotos | self.part[3].pack(), |
144 | f99fe99d | Nikos Skalkotos | self.signature)
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145 | 331aa0ec | Nikos Skalkotos | |
146 | c0240ac1 | Nikos Skalkotos | def __str__(self): |
147 | c0240ac1 | Nikos Skalkotos | ret = ""
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148 | 331aa0ec | Nikos Skalkotos | for i in range(4): |
149 | c0240ac1 | Nikos Skalkotos | ret += "Partition %d: %s\n" % (i, self.part[i]) |
150 | f99fe99d | Nikos Skalkotos | ret += "Signature: %s %s\n" % (hex(ord(self.signature[0])), |
151 | f99fe99d | Nikos Skalkotos | hex(ord(self.signature[1]))) |
152 | c0240ac1 | Nikos Skalkotos | return ret
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153 | 331aa0ec | Nikos Skalkotos | |
154 | 331aa0ec | Nikos Skalkotos | |
155 | 331aa0ec | Nikos Skalkotos | class GPTPartitionTable(object): |
156 | c0240ac1 | Nikos Skalkotos | """Represents a GUID Partition Table."""
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157 | 331aa0ec | Nikos Skalkotos | class GPTHeader(object): |
158 | c0240ac1 | Nikos Skalkotos | """Represents a GPT Header of a GUID Partition Table."""
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159 | 331aa0ec | Nikos Skalkotos | format = "<8s4sII4xQQQQ16sQIII"
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160 | 331aa0ec | Nikos Skalkotos | """
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161 | 331aa0ec | Nikos Skalkotos | Offset Length Contents
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162 | 331aa0ec | Nikos Skalkotos | 0 8 bytes Signature
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163 | 331aa0ec | Nikos Skalkotos | 8 4 bytes Revision
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164 | 331aa0ec | Nikos Skalkotos | 12 4 bytes Header size in little endian
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165 | 331aa0ec | Nikos Skalkotos | 16 4 bytes CRC32 of header
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166 | 331aa0ec | Nikos Skalkotos | 20 4 bytes Reserved; must be zero
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167 | 331aa0ec | Nikos Skalkotos | 24 8 bytes Current LBA
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168 | 331aa0ec | Nikos Skalkotos | 32 8 bytes Backup LBA
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169 | 331aa0ec | Nikos Skalkotos | 40 8 bytes First usable LBA for partitions
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170 | 331aa0ec | Nikos Skalkotos | 48 8 bytes Last usable LBA
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171 | 331aa0ec | Nikos Skalkotos | 56 16 bytes Disk GUID
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172 | 331aa0ec | Nikos Skalkotos | 72 8 bytes Partition entries starting LBA
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173 | 331aa0ec | Nikos Skalkotos | 80 4 bytes Number of partition entries
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174 | 331aa0ec | Nikos Skalkotos | 84 4 bytes Size of a partition entry
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175 | 331aa0ec | Nikos Skalkotos | 88 4 bytes CRC32 of partition array
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176 | 331aa0ec | Nikos Skalkotos | 92 * Reserved; must be zeroes
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177 | 331aa0ec | Nikos Skalkotos | LBA size Total
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178 | 331aa0ec | Nikos Skalkotos | """
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179 | 331aa0ec | Nikos Skalkotos | |
180 | 331aa0ec | Nikos Skalkotos | def __init__(self, block): |
181 | 88f83027 | Nikos Skalkotos | """Create a GPTHeader instance"""
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182 | f99fe99d | Nikos Skalkotos | (self.signature,
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183 | f99fe99d | Nikos Skalkotos | self.revision,
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184 | f99fe99d | Nikos Skalkotos | self.hdr_size,
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185 | f99fe99d | Nikos Skalkotos | self.header_crc32,
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186 | f99fe99d | Nikos Skalkotos | self.current_lba,
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187 | f99fe99d | Nikos Skalkotos | self.backup_lba,
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188 | f99fe99d | Nikos Skalkotos | self.first_usable_lba,
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189 | f99fe99d | Nikos Skalkotos | self.last_usable_lba,
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190 | f99fe99d | Nikos Skalkotos | self.uuid,
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191 | f99fe99d | Nikos Skalkotos | self.part_entry_start,
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192 | f99fe99d | Nikos Skalkotos | self.part_count,
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193 | f99fe99d | Nikos Skalkotos | self.part_entry_size,
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194 | f99fe99d | Nikos Skalkotos | self.part_crc32) = struct.unpack(self.format, block) |
195 | 331aa0ec | Nikos Skalkotos | |
196 | 331aa0ec | Nikos Skalkotos | def pack(self): |
197 | c0240ac1 | Nikos Skalkotos | """Packs a GPT Header to a binary string."""
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198 | 331aa0ec | Nikos Skalkotos | return struct.pack(self.format, |
199 | f99fe99d | Nikos Skalkotos | self.signature,
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200 | f99fe99d | Nikos Skalkotos | self.revision,
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201 | f99fe99d | Nikos Skalkotos | self.hdr_size,
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202 | f99fe99d | Nikos Skalkotos | self.header_crc32,
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203 | f99fe99d | Nikos Skalkotos | self.current_lba,
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204 | f99fe99d | Nikos Skalkotos | self.backup_lba,
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205 | f99fe99d | Nikos Skalkotos | self.first_usable_lba,
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206 | f99fe99d | Nikos Skalkotos | self.last_usable_lba,
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207 | f99fe99d | Nikos Skalkotos | self.uuid,
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208 | f99fe99d | Nikos Skalkotos | self.part_entry_start,
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209 | f99fe99d | Nikos Skalkotos | self.part_count,
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210 | f99fe99d | Nikos Skalkotos | self.part_entry_size,
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211 | f99fe99d | Nikos Skalkotos | self.part_crc32)
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212 | 331aa0ec | Nikos Skalkotos | |
213 | c0240ac1 | Nikos Skalkotos | @staticmethod
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214 | c0240ac1 | Nikos Skalkotos | def size(): |
215 | 88f83027 | Nikos Skalkotos | """Return the size of a GPT Header."""
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216 | c0240ac1 | Nikos Skalkotos | return struct.calcsize(GPTPartitionTable.GPTHeader.format)
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217 | c0240ac1 | Nikos Skalkotos | |
218 | c0240ac1 | Nikos Skalkotos | def __str__(self): |
219 | 35b13de5 | Nikos Skalkotos | """Print a GPTHeader"""
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220 | f99fe99d | Nikos Skalkotos | return "Signature: %s\n" % self.signature + \ |
221 | f99fe99d | Nikos Skalkotos | "Revision: %r\n" % self.revision + \ |
222 | f99fe99d | Nikos Skalkotos | "Header Size: %d\n" % self.hdr_size + \ |
223 | f99fe99d | Nikos Skalkotos | "CRC32: %d\n" % self.header_crc32 + \ |
224 | f99fe99d | Nikos Skalkotos | "Current LBA: %d\n" % self.current_lba + \ |
225 | f99fe99d | Nikos Skalkotos | "Backup LBA: %d\n" % self.backup_lba + \ |
226 | f99fe99d | Nikos Skalkotos | "First Usable LBA: %d\n" % self.first_usable_lba + \ |
227 | f99fe99d | Nikos Skalkotos | "Last Usable LBA: %d\n" % self.last_usable_lba + \ |
228 | f99fe99d | Nikos Skalkotos | "Disk GUID: %s\n" % uuid.UUID(bytes=self.uuid) + \ |
229 | f99fe99d | Nikos Skalkotos | "Partition entries starting LBA: %d\n" % \
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230 | f99fe99d | Nikos Skalkotos | self.part_entry_start + \
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231 | f99fe99d | Nikos Skalkotos | "Number of Partition entries: %d\n" % self.part_count + \ |
232 | f99fe99d | Nikos Skalkotos | "Size of a partition entry: %d\n" % self.part_entry_size + \ |
233 | f99fe99d | Nikos Skalkotos | "CRC32 of partition array: %s\n" % self.part_crc32 |
234 | 331aa0ec | Nikos Skalkotos | |
235 | 331aa0ec | Nikos Skalkotos | def __init__(self, disk): |
236 | 88f83027 | Nikos Skalkotos | """Create a GPTPartitionTable instance"""
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237 | 331aa0ec | Nikos Skalkotos | self.disk = disk
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238 | 331aa0ec | Nikos Skalkotos | with open(disk, "rb") as d: |
239 | 5b801534 | Nikos Skalkotos | # MBR (Logical block address 0)
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240 | 331aa0ec | Nikos Skalkotos | lba0 = d.read(BLOCKSIZE) |
241 | 331aa0ec | Nikos Skalkotos | self.mbr = MBR(lba0)
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242 | c0240ac1 | Nikos Skalkotos | |
243 | 331aa0ec | Nikos Skalkotos | # Primary GPT Header (LBA 1)
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244 | c0240ac1 | Nikos Skalkotos | raw_header = d.read(self.GPTHeader.size())
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245 | c0240ac1 | Nikos Skalkotos | self.primary = self.GPTHeader(raw_header) |
246 | c0240ac1 | Nikos Skalkotos | |
247 | 331aa0ec | Nikos Skalkotos | # Partition entries (LBA 2...34)
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248 | 331aa0ec | Nikos Skalkotos | d.seek(self.primary.part_entry_start * BLOCKSIZE)
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249 | 331aa0ec | Nikos Skalkotos | entries_size = self.primary.part_count * \
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250 | f99fe99d | Nikos Skalkotos | self.primary.part_entry_size
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251 | 331aa0ec | Nikos Skalkotos | self.part_entries = d.read(entries_size)
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252 | c0240ac1 | Nikos Skalkotos | |
253 | 331aa0ec | Nikos Skalkotos | # Secondary GPT Header (LBA -1)
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254 | 331aa0ec | Nikos Skalkotos | d.seek(self.primary.backup_lba * BLOCKSIZE)
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255 | c0240ac1 | Nikos Skalkotos | raw_header = d.read(self.GPTHeader.size())
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256 | c0240ac1 | Nikos Skalkotos | self.secondary = self.GPTHeader(raw_header) |
257 | 331aa0ec | Nikos Skalkotos | |
258 | 331aa0ec | Nikos Skalkotos | def size(self): |
259 | 88f83027 | Nikos Skalkotos | """Return the payload size of GPT partitioned device."""
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260 | c0240ac1 | Nikos Skalkotos | return (self.primary.backup_lba + 1) * BLOCKSIZE |
261 | 331aa0ec | Nikos Skalkotos | |
262 | 9666a511 | Nikos Skalkotos | def shrink(self, size, old_size): |
263 | c0240ac1 | Nikos Skalkotos | """Move the secondary GPT Header entries to the address specified by
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264 | c0240ac1 | Nikos Skalkotos | size parameter.
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265 | c0240ac1 | Nikos Skalkotos | """
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266 | 331aa0ec | Nikos Skalkotos | |
267 | 9666a511 | Nikos Skalkotos | # Most partition manipulation programs leave 2048 sector after the last
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268 | 9666a511 | Nikos Skalkotos | # partition
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269 | 9666a511 | Nikos Skalkotos | aligned = size + 2048 * BLOCKSIZE
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270 | 9666a511 | Nikos Skalkotos | |
271 | 9666a511 | Nikos Skalkotos | # new_size is at least: size + Partition Entries + Secondary GPT Header
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272 | 9666a511 | Nikos Skalkotos | new_size = aligned if aligned <= old_size else \ |
273 | f99fe99d | Nikos Skalkotos | size + len(self.part_entries) + BLOCKSIZE |
274 | 9666a511 | Nikos Skalkotos | |
275 | 9666a511 | Nikos Skalkotos | assert new_size <= old_size, "The secodary GPT fits in the device" |
276 | 9666a511 | Nikos Skalkotos | |
277 | 9666a511 | Nikos Skalkotos | if new_size == self.size(): |
278 | 9666a511 | Nikos Skalkotos | return new_size
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279 | 331aa0ec | Nikos Skalkotos | |
280 | 331aa0ec | Nikos Skalkotos | lba_count = new_size // BLOCKSIZE |
281 | 331aa0ec | Nikos Skalkotos | |
282 | 331aa0ec | Nikos Skalkotos | # Correct MBR
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283 | c0240ac1 | Nikos Skalkotos | #TODO: Check if the partition tables is hybrid
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284 | 331aa0ec | Nikos Skalkotos | self.mbr.part[0].sector_count = (new_size // BLOCKSIZE) - 1 |
285 | 331aa0ec | Nikos Skalkotos | |
286 | c0240ac1 | Nikos Skalkotos | # Fix Primary header
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287 | 331aa0ec | Nikos Skalkotos | self.primary.header_crc32 = 0 |
288 | 331aa0ec | Nikos Skalkotos | self.primary.backup_lba = lba_count - 1 # LBA-1 |
289 | 331aa0ec | Nikos Skalkotos | self.primary.last_usable_lba = lba_count - 34 # LBA-34 |
290 | 331aa0ec | Nikos Skalkotos | self.primary.header_crc32 = \
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291 | f99fe99d | Nikos Skalkotos | binascii.crc32(self.primary.pack()) & 0xffffffff |
292 | 331aa0ec | Nikos Skalkotos | |
293 | c0240ac1 | Nikos Skalkotos | # Fix Secondary header
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294 | 331aa0ec | Nikos Skalkotos | self.secondary.header_crc32 = 0 |
295 | 331aa0ec | Nikos Skalkotos | self.secondary.current_lba = self.primary.backup_lba |
296 | 331aa0ec | Nikos Skalkotos | self.secondary.last_usable_lba = lba_count - 34 # LBA-34 |
297 | 331aa0ec | Nikos Skalkotos | self.secondary.part_entry_start = lba_count - 33 # LBA-33 |
298 | 331aa0ec | Nikos Skalkotos | self.secondary.header_crc32 = \
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299 | f99fe99d | Nikos Skalkotos | binascii.crc32(self.secondary.pack()) & 0xffffffff |
300 | 331aa0ec | Nikos Skalkotos | |
301 | 331aa0ec | Nikos Skalkotos | # Copy the new partition table back to the device
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302 | 331aa0ec | Nikos Skalkotos | with open(self.disk, "wb") as d: |
303 | 331aa0ec | Nikos Skalkotos | d.write(self.mbr.pack())
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304 | 331aa0ec | Nikos Skalkotos | d.write(self.primary.pack())
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305 | c0240ac1 | Nikos Skalkotos | d.write('\x00' * (BLOCKSIZE - self.primary.size())) |
306 | b0376b3f | Nikos Skalkotos | d.write(self.part_entries)
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307 | 331aa0ec | Nikos Skalkotos | d.seek(self.secondary.part_entry_start * BLOCKSIZE)
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308 | 331aa0ec | Nikos Skalkotos | d.write(self.part_entries)
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309 | 331aa0ec | Nikos Skalkotos | d.seek(self.primary.backup_lba * BLOCKSIZE)
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310 | 331aa0ec | Nikos Skalkotos | d.write(self.secondary.pack())
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311 | c0240ac1 | Nikos Skalkotos | d.write('\x00' * (BLOCKSIZE - self.secondary.size())) |
312 | 331aa0ec | Nikos Skalkotos | |
313 | 331aa0ec | Nikos Skalkotos | return new_size
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314 | 331aa0ec | Nikos Skalkotos | |
315 | 331aa0ec | Nikos Skalkotos | if __name__ == '__main__': |
316 | 331aa0ec | Nikos Skalkotos | ptable = GPTPartitionTable(sys.argv[1])
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317 | 331aa0ec | Nikos Skalkotos | |
318 | c0240ac1 | Nikos Skalkotos | print "MBR:\n%s" % ptable.mbr |
319 | c0240ac1 | Nikos Skalkotos | print "Primary partition table:\n%s" % ptable.primary |
320 | c0240ac1 | Nikos Skalkotos | print "Secondary partition table:\n%s" % ptable.secondary |
321 | 331aa0ec | Nikos Skalkotos | |
322 | 331aa0ec | Nikos Skalkotos | # vim: set sta sts=4 shiftwidth=4 sw=4 et ai : |