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annotate lib/python3.8/site-packages/wheel/macosx_libfile.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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1 """
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2 This module contains function to analyse dynamic library
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3 headers to extract system information
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4
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5 Currently only for MacOSX
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6
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7 Library file on macosx system starts with Mach-O or Fat field.
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8 This can be distinguish by first 32 bites and it is called magic number.
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9 Proper value of magic number is with suffix _MAGIC. Suffix _CIGAM means
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10 reversed bytes order.
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11 Both fields can occur in two types: 32 and 64 bytes.
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12
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13 FAT field inform that this library contains few version of library
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14 (typically for different types version). It contains
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15 information where Mach-O headers starts.
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16
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17 Each section started with Mach-O header contains one library
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18 (So if file starts with this field it contains only one version).
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19
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20 After filed Mach-O there are section fields.
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21 Each of them starts with two fields:
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22 cmd - magic number for this command
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23 cmdsize - total size occupied by this section information.
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24
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25 In this case only sections LC_VERSION_MIN_MACOSX (for macosx 10.13 and earlier)
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26 and LC_BUILD_VERSION (for macosx 10.14 and newer) are interesting,
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27 because them contains information about minimal system version.
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28
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29 Important remarks:
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30 - For fat files this implementation looks for maximum number version.
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31 It not check if it is 32 or 64 and do not compare it with currently builded package.
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32 So it is possible to false report higher version that needed.
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33 - All structures signatures are taken form macosx header files.
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34 - I think that binary format will be more stable than `otool` output.
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35 and if apple introduce some changes both implementation will need to be updated.
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36 """
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37
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38 import ctypes
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39 import sys
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40
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41 """here the needed const and struct from mach-o header files"""
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42
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43 FAT_MAGIC = 0xcafebabe
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44 FAT_CIGAM = 0xbebafeca
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45 FAT_MAGIC_64 = 0xcafebabf
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46 FAT_CIGAM_64 = 0xbfbafeca
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47 MH_MAGIC = 0xfeedface
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48 MH_CIGAM = 0xcefaedfe
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49 MH_MAGIC_64 = 0xfeedfacf
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50 MH_CIGAM_64 = 0xcffaedfe
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51
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52 LC_VERSION_MIN_MACOSX = 0x24
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53 LC_BUILD_VERSION = 0x32
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54
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55
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56 mach_header_fields = [
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57 ("magic", ctypes.c_uint32), ("cputype", ctypes.c_int),
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58 ("cpusubtype", ctypes.c_int), ("filetype", ctypes.c_uint32),
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59 ("ncmds", ctypes.c_uint32), ("sizeofcmds", ctypes.c_uint32),
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60 ("flags", ctypes.c_uint32)
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61 ]
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62 """
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63 struct mach_header {
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64 uint32_t magic; /* mach magic number identifier */
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65 cpu_type_t cputype; /* cpu specifier */
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66 cpu_subtype_t cpusubtype; /* machine specifier */
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67 uint32_t filetype; /* type of file */
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68 uint32_t ncmds; /* number of load commands */
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69 uint32_t sizeofcmds; /* the size of all the load commands */
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70 uint32_t flags; /* flags */
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71 };
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72 typedef integer_t cpu_type_t;
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73 typedef integer_t cpu_subtype_t;
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74 """
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75
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76 mach_header_fields_64 = mach_header_fields + [("reserved", ctypes.c_uint32)]
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77 """
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78 struct mach_header_64 {
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79 uint32_t magic; /* mach magic number identifier */
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80 cpu_type_t cputype; /* cpu specifier */
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81 cpu_subtype_t cpusubtype; /* machine specifier */
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82 uint32_t filetype; /* type of file */
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83 uint32_t ncmds; /* number of load commands */
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84 uint32_t sizeofcmds; /* the size of all the load commands */
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85 uint32_t flags; /* flags */
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86 uint32_t reserved; /* reserved */
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87 };
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88 """
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89
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90 fat_header_fields = [("magic", ctypes.c_uint32), ("nfat_arch", ctypes.c_uint32)]
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91 """
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92 struct fat_header {
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93 uint32_t magic; /* FAT_MAGIC or FAT_MAGIC_64 */
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94 uint32_t nfat_arch; /* number of structs that follow */
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95 };
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96 """
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97
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98 fat_arch_fields = [
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99 ("cputype", ctypes.c_int), ("cpusubtype", ctypes.c_int),
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100 ("offset", ctypes.c_uint32), ("size", ctypes.c_uint32),
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101 ("align", ctypes.c_uint32)
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102 ]
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103 """
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104 struct fat_arch {
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105 cpu_type_t cputype; /* cpu specifier (int) */
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106 cpu_subtype_t cpusubtype; /* machine specifier (int) */
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107 uint32_t offset; /* file offset to this object file */
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108 uint32_t size; /* size of this object file */
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109 uint32_t align; /* alignment as a power of 2 */
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110 };
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111 """
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112
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113 fat_arch_64_fields = [
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114 ("cputype", ctypes.c_int), ("cpusubtype", ctypes.c_int),
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115 ("offset", ctypes.c_uint64), ("size", ctypes.c_uint64),
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116 ("align", ctypes.c_uint32), ("reserved", ctypes.c_uint32)
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117 ]
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118 """
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119 struct fat_arch_64 {
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120 cpu_type_t cputype; /* cpu specifier (int) */
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121 cpu_subtype_t cpusubtype; /* machine specifier (int) */
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122 uint64_t offset; /* file offset to this object file */
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123 uint64_t size; /* size of this object file */
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124 uint32_t align; /* alignment as a power of 2 */
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125 uint32_t reserved; /* reserved */
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126 };
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127 """
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128
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129 segment_base_fields = [("cmd", ctypes.c_uint32), ("cmdsize", ctypes.c_uint32)]
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130 """base for reading segment info"""
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131
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132 segment_command_fields = [
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133 ("cmd", ctypes.c_uint32), ("cmdsize", ctypes.c_uint32),
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134 ("segname", ctypes.c_char * 16), ("vmaddr", ctypes.c_uint32),
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135 ("vmsize", ctypes.c_uint32), ("fileoff", ctypes.c_uint32),
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136 ("filesize", ctypes.c_uint32), ("maxprot", ctypes.c_int),
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137 ("initprot", ctypes.c_int), ("nsects", ctypes.c_uint32),
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138 ("flags", ctypes.c_uint32),
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139 ]
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140 """
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141 struct segment_command { /* for 32-bit architectures */
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142 uint32_t cmd; /* LC_SEGMENT */
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143 uint32_t cmdsize; /* includes sizeof section structs */
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144 char segname[16]; /* segment name */
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145 uint32_t vmaddr; /* memory address of this segment */
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146 uint32_t vmsize; /* memory size of this segment */
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147 uint32_t fileoff; /* file offset of this segment */
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148 uint32_t filesize; /* amount to map from the file */
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149 vm_prot_t maxprot; /* maximum VM protection */
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150 vm_prot_t initprot; /* initial VM protection */
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151 uint32_t nsects; /* number of sections in segment */
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152 uint32_t flags; /* flags */
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153 };
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154 typedef int vm_prot_t;
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155 """
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156
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157 segment_command_fields_64 = [
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158 ("cmd", ctypes.c_uint32), ("cmdsize", ctypes.c_uint32),
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159 ("segname", ctypes.c_char * 16), ("vmaddr", ctypes.c_uint64),
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160 ("vmsize", ctypes.c_uint64), ("fileoff", ctypes.c_uint64),
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161 ("filesize", ctypes.c_uint64), ("maxprot", ctypes.c_int),
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162 ("initprot", ctypes.c_int), ("nsects", ctypes.c_uint32),
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163 ("flags", ctypes.c_uint32),
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164 ]
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165 """
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166 struct segment_command_64 { /* for 64-bit architectures */
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167 uint32_t cmd; /* LC_SEGMENT_64 */
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168 uint32_t cmdsize; /* includes sizeof section_64 structs */
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169 char segname[16]; /* segment name */
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170 uint64_t vmaddr; /* memory address of this segment */
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171 uint64_t vmsize; /* memory size of this segment */
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172 uint64_t fileoff; /* file offset of this segment */
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173 uint64_t filesize; /* amount to map from the file */
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174 vm_prot_t maxprot; /* maximum VM protection */
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175 vm_prot_t initprot; /* initial VM protection */
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176 uint32_t nsects; /* number of sections in segment */
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177 uint32_t flags; /* flags */
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178 };
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179 """
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180
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181 version_min_command_fields = segment_base_fields + \
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182 [("version", ctypes.c_uint32), ("sdk", ctypes.c_uint32)]
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183 """
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184 struct version_min_command {
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185 uint32_t cmd; /* LC_VERSION_MIN_MACOSX or
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186 LC_VERSION_MIN_IPHONEOS or
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187 LC_VERSION_MIN_WATCHOS or
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188 LC_VERSION_MIN_TVOS */
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189 uint32_t cmdsize; /* sizeof(struct min_version_command) */
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190 uint32_t version; /* X.Y.Z is encoded in nibbles xxxx.yy.zz */
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191 uint32_t sdk; /* X.Y.Z is encoded in nibbles xxxx.yy.zz */
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192 };
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193 """
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194
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195 build_version_command_fields = segment_base_fields + \
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196 [("platform", ctypes.c_uint32), ("minos", ctypes.c_uint32),
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197 ("sdk", ctypes.c_uint32), ("ntools", ctypes.c_uint32)]
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198 """
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199 struct build_version_command {
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200 uint32_t cmd; /* LC_BUILD_VERSION */
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201 uint32_t cmdsize; /* sizeof(struct build_version_command) plus */
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202 /* ntools * sizeof(struct build_tool_version) */
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203 uint32_t platform; /* platform */
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204 uint32_t minos; /* X.Y.Z is encoded in nibbles xxxx.yy.zz */
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205 uint32_t sdk; /* X.Y.Z is encoded in nibbles xxxx.yy.zz */
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206 uint32_t ntools; /* number of tool entries following this */
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207 };
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208 """
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209
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210
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211 def swap32(x):
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212 return (((x << 24) & 0xFF000000) |
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213 ((x << 8) & 0x00FF0000) |
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214 ((x >> 8) & 0x0000FF00) |
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215 ((x >> 24) & 0x000000FF))
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216
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217
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218 def get_base_class_and_magic_number(lib_file, seek=None):
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219 if seek is None:
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220 seek = lib_file.tell()
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221 else:
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222 lib_file.seek(seek)
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223 magic_number = ctypes.c_uint32.from_buffer_copy(
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224 lib_file.read(ctypes.sizeof(ctypes.c_uint32))).value
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225
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226 # Handle wrong byte order
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227 if magic_number in [FAT_CIGAM, FAT_CIGAM_64, MH_CIGAM, MH_CIGAM_64]:
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228 if sys.byteorder == "little":
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229 BaseClass = ctypes.BigEndianStructure
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230 else:
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231 BaseClass = ctypes.LittleEndianStructure
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232
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233 magic_number = swap32(magic_number)
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234 else:
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235 BaseClass = ctypes.Structure
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236
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237 lib_file.seek(seek)
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238 return BaseClass, magic_number
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239
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240
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241 def read_data(struct_class, lib_file):
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242 return struct_class.from_buffer_copy(lib_file.read(
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243 ctypes.sizeof(struct_class)))
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244
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245
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246 def extract_macosx_min_system_version(path_to_lib):
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247 with open(path_to_lib, "rb") as lib_file:
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248 BaseClass, magic_number = get_base_class_and_magic_number(lib_file, 0)
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249 if magic_number not in [FAT_MAGIC, FAT_MAGIC_64, MH_MAGIC, MH_MAGIC_64]:
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250 return
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251
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252 if magic_number in [FAT_MAGIC, FAT_CIGAM_64]:
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253 class FatHeader(BaseClass):
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254 _fields_ = fat_header_fields
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255
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256 fat_header = read_data(FatHeader, lib_file)
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257 if magic_number == FAT_MAGIC:
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258
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259 class FatArch(BaseClass):
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260 _fields_ = fat_arch_fields
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261 else:
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262
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263 class FatArch(BaseClass):
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264 _fields_ = fat_arch_64_fields
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265
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266 fat_arch_list = [read_data(FatArch, lib_file) for _ in range(fat_header.nfat_arch)]
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267
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268 versions_list = []
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269 for el in fat_arch_list:
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270 try:
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271 version = read_mach_header(lib_file, el.offset)
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272 if version is not None:
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273 versions_list.append(version)
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274 except ValueError:
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275 pass
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276
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277 if len(versions_list) > 0:
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278 return max(versions_list)
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279 else:
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280 return None
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281
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282 else:
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283 try:
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284 return read_mach_header(lib_file, 0)
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285 except ValueError:
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286 """when some error during read library files"""
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287 return None
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288
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289
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290 def read_mach_header(lib_file, seek=None):
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291 """
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292 This funcition parse mach-O header and extract
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293 information about minimal system version
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294
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295 :param lib_file: reference to opened library file with pointer
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296 """
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297 if seek is not None:
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298 lib_file.seek(seek)
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299 base_class, magic_number = get_base_class_and_magic_number(lib_file)
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300 arch = "32" if magic_number == MH_MAGIC else "64"
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301
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302 class SegmentBase(base_class):
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303 _fields_ = segment_base_fields
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304
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305 if arch == "32":
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306
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307 class MachHeader(base_class):
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308 _fields_ = mach_header_fields
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309
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310 else:
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311
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312 class MachHeader(base_class):
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313 _fields_ = mach_header_fields_64
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314
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315 mach_header = read_data(MachHeader, lib_file)
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316 for _i in range(mach_header.ncmds):
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317 pos = lib_file.tell()
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318 segment_base = read_data(SegmentBase, lib_file)
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319 lib_file.seek(pos)
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320 if segment_base.cmd == LC_VERSION_MIN_MACOSX:
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321 class VersionMinCommand(base_class):
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322 _fields_ = version_min_command_fields
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323
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324 version_info = read_data(VersionMinCommand, lib_file)
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325 return parse_version(version_info.version)
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326 elif segment_base.cmd == LC_BUILD_VERSION:
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327 class VersionBuild(base_class):
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328 _fields_ = build_version_command_fields
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329
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330 version_info = read_data(VersionBuild, lib_file)
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331 return parse_version(version_info.minos)
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332 else:
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333 lib_file.seek(pos + segment_base.cmdsize)
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334 continue
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335
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336
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337 def parse_version(version):
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338 x = (version & 0xffff0000) >> 16
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339 y = (version & 0x0000ff00) >> 8
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340 z = (version & 0x000000ff)
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341 return x, y, z