ldid.cpp

   1 /* ldid - (Mach-O) Link-Loader Identity Editor
   2  * Copyright (C) 2007-2012  Jay Freeman (saurik)
   3 */
   4
   5 /* GNU Affero General Public License, Version 3 {{{ */
   6 /*
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 **/
  20 /* }}} */
  21
  22 #include "minimal/stdlib.h"
  23 #include "minimal/string.h"
  24 #include "minimal/mapping.h"
  25
  26 extern "C" {
  27 #include "sha1.h"
  28 }
  29
  30 #include <cstring>
  31 #include <string>
  32 #include <vector>
  33
  34 struct fat_header {
  35     uint32_t magic;
  36     uint32_t nfat_arch;
  37 } _packed;
  38
  39 #define FAT_MAGIC 0xcafebabe
  40 #define FAT_CIGAM 0xbebafeca
  41
  42 struct fat_arch {
  43     uint32_t cputype;
  44     uint32_t cpusubtype;
  45     uint32_t offset;
  46     uint32_t size;
  47     uint32_t align;
  48 } _packed;
  49
  50 struct mach_header {
  51     uint32_t magic;
  52     uint32_t cputype;
  53     uint32_t cpusubtype;
  54     uint32_t filetype;
  55     uint32_t ncmds;
  56     uint32_t sizeofcmds;
  57     uint32_t flags;
  58 } _packed;
  59
  60 #define MH_MAGIC 0xfeedface
  61 #define MH_CIGAM 0xcefaedfe
  62
  63 #define MH_MAGIC_64 0xfeedfacf
  64 #define MH_CIGAM_64 0xcffaedfe
  65
  66 #define MH_DYLDLINK   0x4
  67
  68 #define MH_OBJECT     0x1
  69 #define MH_EXECUTE    0x2
  70 #define MH_DYLIB      0x6
  71 #define MH_BUNDLE     0x8
  72 #define MH_DYLIB_STUB 0x9
  73
  74 struct load_command {
  75     uint32_t cmd;
  76     uint32_t cmdsize;
  77 } _packed;
  78
  79 #define LC_REQ_DYLD           uint32_t(0x80000000)
  80
  81 #define LC_SEGMENT            uint32_t(0x01)
  82 #define LC_SYMTAB             uint32_t(0x02)
  83 #define LC_DYSYMTAB           uint32_t(0x0b)
  84 #define LC_LOAD_DYLIB         uint32_t(0x0c)
  85 #define LC_ID_DYLIB           uint32_t(0x0d)
  86 #define LC_SEGMENT_64         uint32_t(0x19)
  87 #define LC_UUID               uint32_t(0x1b)
  88 #define LC_CODE_SIGNATURE     uint32_t(0x1d)
  89 #define LC_SEGMENT_SPLIT_INFO uint32_t(0x1e)
  90 #define LC_REEXPORT_DYLIB     uint32_t(0x1f | LC_REQ_DYLD)
  91 #define LC_ENCRYPTION_INFO    uint32_t(0x21)
  92 #define LC_DYLD_INFO          uint32_t(0x22)
  93 #define LC_DYLD_INFO_ONLY     uint32_t(0x22 | LC_REQ_DYLD)
  94
  95 struct dylib {
  96     uint32_t name;
  97     uint32_t timestamp;
  98     uint32_t current_version;
  99     uint32_t compatibility_version;
 100 } _packed;
 101
 102 struct dylib_command {
 103     uint32_t cmd;
 104     uint32_t cmdsize;
 105     struct dylib dylib;
 106 } _packed;
 107
 108 struct uuid_command {
 109     uint32_t cmd;
 110     uint32_t cmdsize;
 111     uint8_t uuid[16];
 112 } _packed;
 113
 114 struct symtab_command {
 115     uint32_t cmd;
 116     uint32_t cmdsize;
 117     uint32_t symoff;
 118     uint32_t nsyms;
 119     uint32_t stroff;
 120     uint32_t strsize;
 121 } _packed;
 122
 123 struct dyld_info_command {
 124     uint32_t cmd;
 125     uint32_t cmdsize;
 126     uint32_t rebase_off;
 127     uint32_t rebase_size;
 128     uint32_t bind_off;
 129     uint32_t bind_size;
 130     uint32_t weak_bind_off;
 131     uint32_t weak_bind_size;
 132     uint32_t lazy_bind_off;
 133     uint32_t lazy_bind_size;
 134     uint32_t export_off;
 135     uint32_t export_size;
 136 } _packed;
 137
 138 struct dysymtab_command {
 139     uint32_t cmd;
 140     uint32_t cmdsize;
 141     uint32_t ilocalsym;
 142     uint32_t nlocalsym;
 143     uint32_t iextdefsym;
 144     uint32_t nextdefsym;
 145     uint32_t iundefsym;
 146     uint32_t nundefsym;
 147     uint32_t tocoff;
 148     uint32_t ntoc;
 149     uint32_t modtaboff;
 150     uint32_t nmodtab;
 151     uint32_t extrefsymoff;
 152     uint32_t nextrefsyms;
 153     uint32_t indirectsymoff;
 154     uint32_t nindirectsyms;
 155     uint32_t extreloff;
 156     uint32_t nextrel;
 157     uint32_t locreloff;
 158     uint32_t nlocrel;
 159 } _packed;
 160
 161 struct dylib_table_of_contents {
 162     uint32_t symbol_index;
 163     uint32_t module_index;
 164 } _packed;
 165
 166 struct dylib_module {
 167     uint32_t module_name;
 168     uint32_t iextdefsym;
 169     uint32_t nextdefsym;
 170     uint32_t irefsym;
 171     uint32_t nrefsym;
 172     uint32_t ilocalsym;
 173     uint32_t nlocalsym;
 174     uint32_t iextrel;
 175     uint32_t nextrel;
 176     uint32_t iinit_iterm;
 177     uint32_t ninit_nterm;
 178     uint32_t objc_module_info_addr;
 179     uint32_t objc_module_info_size;
 180 } _packed;
 181
 182 struct dylib_reference {
 183     uint32_t isym:24;
 184     uint32_t flags:8;
 185 } _packed;
 186
 187 struct relocation_info {
 188     int32_t r_address;
 189     uint32_t r_symbolnum:24;
 190     uint32_t r_pcrel:1;
 191     uint32_t r_length:2;
 192     uint32_t r_extern:1;
 193     uint32_t r_type:4;
 194 } _packed;
 195
 196 struct nlist {
 197     union {
 198         char *n_name;
 199         int32_t n_strx;
 200     } n_un;
 201
 202     uint8_t n_type;
 203     uint8_t n_sect;
 204     uint8_t n_desc;
 205     uint32_t n_value;
 206 } _packed;
 207
 208 struct segment_command {
 209     uint32_t cmd;
 210     uint32_t cmdsize;
 211     char segname[16];
 212     uint32_t vmaddr;
 213     uint32_t vmsize;
 214     uint32_t fileoff;
 215     uint32_t filesize;
 216     uint32_t maxprot;
 217     uint32_t initprot;
 218     uint32_t nsects;
 219     uint32_t flags;
 220 } _packed;
 221
 222 struct segment_command_64 {
 223     uint32_t cmd;
 224     uint32_t cmdsize;
 225     char segname[16];
 226     uint64_t vmaddr;
 227     uint64_t vmsize;
 228     uint64_t fileoff;
 229     uint64_t filesize;
 230     uint32_t maxprot;
 231     uint32_t initprot;
 232     uint32_t nsects;
 233     uint32_t flags;
 234 } _packed;
 235
 236 struct section {
 237     char sectname[16];
 238     char segname[16];
 239     uint32_t addr;
 240     uint32_t size;
 241     uint32_t offset;
 242     uint32_t align;
 243     uint32_t reloff;
 244     uint32_t nreloc;
 245     uint32_t flags;
 246     uint32_t reserved1;
 247     uint32_t reserved2;
 248 } _packed;
 249
 250 struct section_64 {
 251     char sectname[16];
 252     char segname[16];
 253     uint64_t addr;
 254     uint64_t size;
 255     uint32_t offset;
 256     uint32_t align;
 257     uint32_t reloff;
 258     uint32_t nreloc;
 259     uint32_t flags;
 260     uint32_t reserved1;
 261     uint32_t reserved2;
 262 } _packed;
 263
 264 struct linkedit_data_command {
 265     uint32_t cmd;
 266     uint32_t cmdsize;
 267     uint32_t dataoff;
 268     uint32_t datasize;
 269 } _packed;
 270
 271 struct encryption_info_command {
 272     uint32_t cmd;
 273     uint32_t cmdsize;
 274     uint32_t cryptoff;
 275     uint32_t cryptsize;
 276     uint32_t cryptid;
 277 } _packed;
 278
 279 #define BIND_OPCODE_MASK                             0xf0
 280 #define BIND_IMMEDIATE_MASK                          0x0f
 281 #define BIND_OPCODE_DONE                             0x00
 282 #define BIND_OPCODE_SET_DYLIB_ORDINAL_IMM            0x10
 283 #define BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB           0x20
 284 #define BIND_OPCODE_SET_DYLIB_SPECIAL_IMM            0x30
 285 #define BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM    0x40
 286 #define BIND_OPCODE_SET_TYPE_IMM                     0x50
 287 #define BIND_OPCODE_SET_ADDEND_SLEB                  0x60
 288 #define BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB      0x70
 289 #define BIND_OPCODE_ADD_ADDR_ULEB                    0x80
 290 #define BIND_OPCODE_DO_BIND                          0x90
 291 #define BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB            0xa0
 292 #define BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED      0xb0
 293 #define BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB 0xc0
 294
 295 template <typename Type_>
 296 Type_ Align(Type_ value, size_t align) {
 297     value += align - 1;
 298     value /= align;
 299     value *= align;
 300     return value;
 301 }
 302
 303 uint16_t Swap_(uint16_t value) {
 304     return
 305         ((value >>  8) & 0x00ff) |
 306         ((value <<  8) & 0xff00);
 307 }
 308
 309 uint32_t Swap_(uint32_t value) {
 310     value = ((value >>  8) & 0x00ff00ff) |
 311             ((value <<  8) & 0xff00ff00);
 312     value = ((value >> 16) & 0x0000ffff) |
 313             ((value << 16) & 0xffff0000);
 314     return value;
 315 }
 316
 317 uint64_t Swap_(uint64_t value) {
 318     value = (value & 0x00000000ffffffff) << 32 | (value & 0xffffffff00000000) >> 32;
 319     value = (value & 0x0000ffff0000ffff) << 16 | (value & 0xffff0000ffff0000) >> 16;
 320     value = (value & 0x00ff00ff00ff00ff) << 8  | (value & 0xff00ff00ff00ff00) >> 8;
 321     return value;
 322 }
 323
 324 int16_t Swap_(int16_t value) {
 325     return Swap_(static_cast<uint16_t>(value));
 326 }
 327
 328 int32_t Swap_(int32_t value) {
 329     return Swap_(static_cast<uint32_t>(value));
 330 }
 331
 332 int64_t Swap_(int64_t value) {
 333     return Swap_(static_cast<uint64_t>(value));
 334 }
 335
 336 bool little_(true);
 337
 338 uint16_t Swap(uint16_t value) {
 339     return little_ ? Swap_(value) : value;
 340 }
 341
 342 uint32_t Swap(uint32_t value) {
 343     return little_ ? Swap_(value) : value;
 344 }
 345
 346 uint64_t Swap(uint64_t value) {
 347     return little_ ? Swap_(value) : value;
 348 }
 349
 350 int16_t Swap(int16_t value) {
 351     return Swap(static_cast<uint16_t>(value));
 352 }
 353
 354 int32_t Swap(int32_t value) {
 355     return Swap(static_cast<uint32_t>(value));
 356 }
 357
 358 int64_t Swap(int64_t value) {
 359     return Swap(static_cast<uint64_t>(value));
 360 }
 361
 362 template <typename Target_>
 363 class Pointer;
 364
 365 class Data {
 366   private:
 367     void *base_;
 368     size_t size_;
 369
 370   protected:
 371     bool swapped_;
 372
 373   public:
 374     Data(void *base, size_t size) :
 375         base_(base),
 376         size_(size),
 377         swapped_(false)
 378     {
 379     }
 380
 381     uint16_t Swap(uint16_t value) const {
 382         return swapped_ ? Swap_(value) : value;
 383     }
 384
 385     uint32_t Swap(uint32_t value) const {
 386         return swapped_ ? Swap_(value) : value;
 387     }
 388
 389     uint64_t Swap(uint64_t value) const {
 390         return swapped_ ? Swap_(value) : value;
 391     }
 392
 393     int16_t Swap(int16_t value) const {
 394         return Swap(static_cast<uint16_t>(value));
 395     }
 396
 397     int32_t Swap(int32_t value) const {
 398         return Swap(static_cast<uint32_t>(value));
 399     }
 400
 401     int64_t Swap(int64_t value) const {
 402         return Swap(static_cast<uint64_t>(value));
 403     }
 404
 405     void *GetBase() const {
 406         return base_;
 407     }
 408
 409     size_t GetSize() const {
 410         return size_;
 411     }
 412 };
 413
 414 class MachHeader :
 415     public Data
 416 {
 417   private:
 418     bool bits64_;
 419
 420     struct mach_header *mach_header_;
 421     struct load_command *load_command_;
 422
 423   public:
 424     MachHeader(void *base, size_t size) :
 425         Data(base, size)
 426     {
 427         mach_header_ = (mach_header *) base;
 428
 429         switch (Swap(mach_header_->magic)) {
 430             case MH_CIGAM:
 431                 swapped_ = !swapped_;
 432             case MH_MAGIC:
 433                 bits64_ = false;
 434             break;
 435
 436             case MH_CIGAM_64:
 437                 swapped_ = !swapped_;
 438             case MH_MAGIC_64:
 439                 bits64_ = true;
 440             break;
 441
 442             default:
 443                 _assert(false);
 444         }
 445
 446         void *post = mach_header_ + 1;
 447         if (bits64_)
 448             post = (uint32_t *) post + 1;
 449         load_command_ = (struct load_command *) post;
 450
 451         _assert(
 452             Swap(mach_header_->filetype) == MH_EXECUTE ||
 453             Swap(mach_header_->filetype) == MH_DYLIB ||
 454             Swap(mach_header_->filetype) == MH_BUNDLE
 455         );
 456     }
 457
 458     struct mach_header *operator ->() const {
 459         return mach_header_;
 460     }
 461
 462     operator struct mach_header *() const {
 463         return mach_header_;
 464     }
 465
 466     uint32_t GetCPUType() const {
 467         return Swap(mach_header_->cputype);
 468     }
 469
 470     uint32_t GetCPUSubtype() const {
 471         return Swap(mach_header_->cpusubtype) & 0xff;
 472     }
 473
 474     struct load_command *GetLoadCommand() const {
 475         return load_command_;
 476     }
 477
 478     std::vector<struct load_command *> GetLoadCommands() const {
 479         std::vector<struct load_command *> load_commands;
 480
 481         struct load_command *load_command = load_command_;
 482         for (uint32_t cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
 483             load_commands.push_back(load_command);
 484             load_command = (struct load_command *) ((uint8_t *) load_command + Swap(load_command->cmdsize));
 485         }
 486
 487         return load_commands;
 488     }
 489
 490     std::vector<segment_command *> GetSegments(const char *segment_name) const {
 491         std::vector<struct segment_command *> segment_commands;
 492
 493         _foreach (load_command, GetLoadCommands()) {
 494             if (Swap(load_command->cmd) == LC_SEGMENT) {
 495                 segment_command *segment_command = reinterpret_cast<struct segment_command *>(load_command);
 496                 if (strncmp(segment_command->segname, segment_name, 16) == 0)
 497                     segment_commands.push_back(segment_command);
 498             }
 499         }
 500
 501         return segment_commands;
 502     }
 503
 504     std::vector<segment_command_64 *> GetSegments64(const char *segment_name) const {
 505         std::vector<struct segment_command_64 *> segment_commands;
 506
 507         _foreach (load_command, GetLoadCommands()) {
 508             if (Swap(load_command->cmd) == LC_SEGMENT_64) {
 509                 segment_command_64 *segment_command = reinterpret_cast<struct segment_command_64 *>(load_command);
 510                 if (strncmp(segment_command->segname, segment_name, 16) == 0)
 511                     segment_commands.push_back(segment_command);
 512             }
 513         }
 514
 515         return segment_commands;
 516     }
 517
 518     std::vector<section *> GetSections(const char *segment_name, const char *section_name) const {
 519         std::vector<section *> sections;
 520
 521         _foreach (segment, GetSegments(segment_name)) {
 522             section *section = (struct section *) (segment + 1);
 523
 524             uint32_t sect;
 525             for (sect = 0; sect != Swap(segment->nsects); ++sect) {
 526                 if (strncmp(section->sectname, section_name, 16) == 0)
 527                     sections.push_back(section);
 528                 ++section;
 529             }
 530         }
 531
 532         return sections;
 533     }
 534
 535     template <typename Target_>
 536     Pointer<Target_> GetPointer(uint32_t address, const char *segment_name = NULL) const {
 537         load_command *load_command = (struct load_command *) (mach_header_ + 1);
 538         uint32_t cmd;
 539
 540         for (cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
 541             if (Swap(load_command->cmd) == LC_SEGMENT) {
 542                 segment_command *segment_command = (struct segment_command *) load_command;
 543                 if (segment_name != NULL && strncmp(segment_command->segname, segment_name, 16) != 0)
 544                     goto next_command;
 545
 546                 section *sections = (struct section *) (segment_command + 1);
 547
 548                 uint32_t sect;
 549                 for (sect = 0; sect != Swap(segment_command->nsects); ++sect) {
 550                     section *section = &sections[sect];
 551                     //printf("%s %u %p %p %u\n", segment_command->segname, sect, address, section->addr, section->size);
 552                     if (address >= Swap(section->addr) && address < Swap(section->addr) + Swap(section->size)) {
 553                         //printf("0x%.8x %s\n", address, segment_command->segname);
 554                         return Pointer<Target_>(this, reinterpret_cast<Target_ *>(address - Swap(section->addr) + Swap(section->offset) + (char *) mach_header_));
 555                     }
 556                 }
 557             }
 558
 559           next_command:
 560             load_command = (struct load_command *) ((char *) load_command + Swap(load_command->cmdsize));
 561         }
 562
 563         return Pointer<Target_>(this);
 564     }
 565
 566     template <typename Target_>
 567     Pointer<Target_> GetOffset(uint32_t offset) {
 568         return Pointer<Target_>(this, reinterpret_cast<Target_ *>(offset + (uint8_t *) mach_header_));
 569     }
 570 };
 571
 572 class FatMachHeader :
 573     public MachHeader
 574 {
 575   private:
 576     fat_arch *fat_arch_;
 577
 578   public:
 579     FatMachHeader(void *base, size_t size, fat_arch *fat_arch) :
 580         MachHeader(base, size),
 581         fat_arch_(fat_arch)
 582     {
 583     }
 584
 585     fat_arch *GetFatArch() const {
 586         return fat_arch_;
 587     }
 588 };
 589
 590 class FatHeader :
 591     public Data
 592 {
 593   private:
 594     fat_header *fat_header_;
 595     std::vector<FatMachHeader> mach_headers_;
 596
 597   public:
 598     FatHeader(void *base, size_t size) :
 599         Data(base, size)
 600     {
 601         fat_header_ = reinterpret_cast<struct fat_header *>(base);
 602
 603         if (Swap(fat_header_->magic) == FAT_CIGAM) {
 604             swapped_ = !swapped_;
 605             goto fat;
 606         } else if (Swap(fat_header_->magic) != FAT_MAGIC) {
 607             fat_header_ = NULL;
 608             mach_headers_.push_back(FatMachHeader(base, size, NULL));
 609         } else fat: {
 610             size_t fat_narch = Swap(fat_header_->nfat_arch);
 611             fat_arch *fat_arch = reinterpret_cast<struct fat_arch *>(fat_header_ + 1);
 612             size_t arch;
 613             for (arch = 0; arch != fat_narch; ++arch) {
 614                 uint32_t arch_offset = Swap(fat_arch->offset);
 615                 uint32_t arch_size = Swap(fat_arch->size);
 616                 mach_headers_.push_back(FatMachHeader((uint8_t *) base + arch_offset, arch_size, fat_arch));
 617                 ++fat_arch;
 618             }
 619         }
 620     }
 621
 622     std::vector<FatMachHeader> &GetMachHeaders() {
 623         return mach_headers_;
 624     }
 625
 626     bool IsFat() const {
 627         return fat_header_ != NULL;
 628     }
 629
 630     struct fat_header *operator ->() const {
 631         return fat_header_;
 632     }
 633
 634     operator struct fat_header *() const {
 635         return fat_header_;
 636     }
 637 };
 638
 639 FatHeader Map(const char *path, bool ro = false) {
 640     size_t size;
 641     void *base(map(path, 0, _not(size_t), &size, ro));
 642     return FatHeader(base, size);
 643 }
 644
 645 template <typename Target_>
 646 class Pointer {
 647   private:
 648     const MachHeader *framework_;
 649     const Target_ *pointer_;
 650
 651   public:
 652     Pointer(const MachHeader *framework = NULL, const Target_ *pointer = NULL) :
 653         framework_(framework),
 654         pointer_(pointer)
 655     {
 656     }
 657
 658     operator const Target_ *() const {
 659         return pointer_;
 660     }
 661
 662     const Target_ *operator ->() const {
 663         return pointer_;
 664     }
 665
 666     Pointer<Target_> &operator ++() {
 667         ++pointer_;
 668         return *this;
 669     }
 670
 671     template <typename Value_>
 672     Value_ Swap(Value_ value) {
 673         return framework_->Swap(value);
 674     }
 675 };
 676
 677 #define CSMAGIC_CODEDIRECTORY      uint32_t(0xfade0c02)
 678 #define CSMAGIC_EMBEDDED_SIGNATURE uint32_t(0xfade0cc0)
 679 #define CSMAGIC_ENTITLEMENTS       uint32_t(0xfade7171)
 680
 681 #define CSSLOT_CODEDIRECTORY uint32_t(0)
 682 #define CSSLOT_REQUIREMENTS  uint32_t(2)
 683 #define CSSLOT_ENTITLEMENTS  uint32_t(5)
 684
 685 struct BlobIndex {
 686     uint32_t type;
 687     uint32_t offset;
 688 } _packed;
 689
 690 struct Blob {
 691     uint32_t magic;
 692     uint32_t length;
 693 } _packed;
 694
 695 struct SuperBlob {
 696     struct Blob blob;
 697     uint32_t count;
 698     struct BlobIndex index[];
 699 } _packed;
 700
 701 struct CodeDirectory {
 702     struct Blob blob;
 703     uint32_t version;
 704     uint32_t flags;
 705     uint32_t hashOffset;
 706     uint32_t identOffset;
 707     uint32_t nSpecialSlots;
 708     uint32_t nCodeSlots;
 709     uint32_t codeLimit;
 710     uint8_t hashSize;
 711     uint8_t hashType;
 712     uint8_t spare1;
 713     uint8_t pageSize;
 714     uint32_t spare2;
 715 } _packed;
 716
 717 extern "C" uint32_t hash(uint8_t *k, uint32_t length, uint32_t initval);
 718
 719 void sha1(uint8_t *hash, uint8_t *data, size_t size) {
 720     SHA1Context context;
 721     SHA1Reset(&context);
 722     SHA1Input(&context, data, size);
 723     SHA1Result(&context, hash);
 724 }
 725
 726 struct CodesignAllocation {
 727     FatMachHeader mach_header_;
 728     uint32_t offset_;
 729     uint32_t size_;
 730     uint32_t alloc_;
 731     uint32_t align_;
 732
 733     CodesignAllocation(FatMachHeader mach_header, size_t offset, size_t size, size_t alloc, size_t align) :
 734         mach_header_(mach_header),
 735         offset_(offset),
 736         size_(size),
 737         alloc_(alloc),
 738         align_(align)
 739     {
 740     }
 741 };
 742
 743 int main(int argc, const char *argv[]) {
 744     union {
 745         uint16_t word;
 746         uint8_t byte[2];
 747     } endian = {1};
 748
 749     little_ = endian.byte[0];
 750
 751     bool flag_R(false);
 752     bool flag_r(false);
 753
 754     bool flag_t(false);
 755     bool flag_p(false);
 756     bool flag_u(false);
 757     bool flag_e(false);
 758
 759     bool flag_T(false);
 760
 761     bool flag_S(false);
 762     bool flag_s(false);
 763
 764     bool flag_O(false);
 765
 766     bool flag_D(false);
 767     bool flag_d(false);
 768
 769     bool flag_A(false);
 770     bool flag_a(false);
 771
 772     uint32_t flag_CPUType(_not(uint32_t));
 773     uint32_t flag_CPUSubtype(_not(uint32_t));
 774
 775     const char *flag_I(NULL);
 776
 777     bool timeh(false);
 778     uint32_t timev(0);
 779
 780     const void *xmld(NULL);
 781     size_t xmls(0);
 782
 783     uintptr_t noffset(_not(uintptr_t));
 784     uintptr_t woffset(_not(uintptr_t));
 785
 786     std::vector<std::string> files;
 787
 788     if (argc == 1) {
 789         fprintf(stderr, "usage: %s -S[entitlements.xml] <binary>\n", argv[0]);
 790         fprintf(stderr, "   %s -e MobileSafari\n", argv[0]);
 791         fprintf(stderr, "   %s -S cat\n", argv[0]);
 792         fprintf(stderr, "   %s -Stfp.xml gdb\n", argv[0]);
 793         exit(0);
 794     }
 795
 796     for (int argi(1); argi != argc; ++argi)
 797         if (argv[argi][0] != '-')
 798             files.push_back(argv[argi]);
 799         else switch (argv[argi][1]) {
 800             case 'R': flag_R = true; break;
 801             case 'r': flag_r = true; break;
 802
 803             case 't': flag_t = true; break;
 804             case 'u': flag_u = true; break;
 805             case 'p': flag_p = true; break;
 806             case 'e': flag_e = true; break;
 807             case 'O': flag_O = true; break;
 808
 809             case 'D': flag_D = true; break;
 810             case 'd': flag_d = true; break;
 811
 812             case 'a': flag_a = true; break;
 813
 814             case 'A':
 815                 flag_A = true;
 816                 if (argv[argi][2] != '\0') {
 817                     const char *cpu = argv[argi] + 2;
 818                     const char *colon = strchr(cpu, ':');
 819                     _assert(colon != NULL);
 820                     char *arge;
 821                     flag_CPUType = strtoul(cpu, &arge, 0);
 822                     _assert(arge == colon);
 823                     flag_CPUSubtype = strtoul(colon + 1, &arge, 0);
 824                     _assert(arge == argv[argi] + strlen(argv[argi]));
 825                 }
 826             break;
 827
 828             case 's':
 829                 _assert(!flag_S);
 830                 flag_s = true;
 831             break;
 832
 833             case 'S':
 834                 _assert(!flag_s);
 835                 flag_S = true;
 836                 if (argv[argi][2] != '\0') {
 837                     const char *xml = argv[argi] + 2;
 838                     xmld = map(xml, 0, _not(size_t), &xmls, true);
 839                 }
 840             break;
 841
 842             case 'T': {
 843                 flag_T = true;
 844                 if (argv[argi][2] == '-')
 845                     timeh = true;
 846                 else {
 847                     char *arge;
 848                     timev = strtoul(argv[argi] + 2, &arge, 0);
 849                     _assert(arge == argv[argi] + strlen(argv[argi]));
 850                 }
 851             } break;
 852
 853             case 'I': {
 854                 flag_I = argv[argi] + 2;
 855             } break;
 856
 857             case 'n': {
 858                 char *arge;
 859                 noffset = strtoul(argv[argi] + 2, &arge, 0);
 860                 _assert(arge == argv[argi] + strlen(argv[argi]));
 861             } break;
 862
 863             case 'w': {
 864                 char *arge;
 865                 woffset = strtoul(argv[argi] + 2, &arge, 0);
 866                 _assert(arge == argv[argi] + strlen(argv[argi]));
 867             } break;
 868
 869             default:
 870                 goto usage;
 871             break;
 872         }
 873
 874     if (files.empty()) usage: {
 875         exit(0);
 876     }
 877
 878     size_t filei(0), filee(0);
 879     _foreach (file, files) try {
 880         const char *path(file.c_str());
 881         const char *base = strrchr(path, '/');
 882         char *temp(NULL), *dir;
 883
 884         if (base != NULL)
 885             dir = strndup_(path, base++ - path + 1);
 886         else {
 887             dir = strdup("");
 888             base = path;
 889         }
 890
 891         const char *name(flag_I ?: base);
 892
 893         if (flag_r) {
 894             uint32_t clip(0); {
 895                 FatHeader fat_header(Map(path));
 896                 _foreach (mach_header, fat_header.GetMachHeaders()) {
 897                     if (flag_A) {
 898                         if (mach_header.GetCPUType() != flag_CPUType)
 899                             continue;
 900                         if (mach_header.GetCPUSubtype() != flag_CPUSubtype)
 901                             continue;
 902                     }
 903
 904                     mach_header->flags = mach_header.Swap(mach_header.Swap(mach_header->flags) | MH_DYLDLINK);
 905
 906                     uint32_t size(_not(uint32_t)); {
 907                         _foreach (load_command, mach_header.GetLoadCommands()) {
 908                             switch (mach_header.Swap(load_command->cmd)) {
 909                                 case LC_CODE_SIGNATURE: {
 910                                     struct linkedit_data_command *signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
 911                                     memset(reinterpret_cast<uint8_t *>(mach_header.GetBase()) + mach_header.Swap(signature->dataoff), 0, mach_header.Swap(signature->datasize));
 912                                     memset(signature, 0, sizeof(struct linkedit_data_command));
 913
 914                                     mach_header->ncmds = mach_header.Swap(mach_header.Swap(mach_header->ncmds) - 1);
 915                                     mach_header->sizeofcmds = mach_header.Swap(uint32_t(mach_header.Swap(mach_header->sizeofcmds) - sizeof(struct linkedit_data_command)));
 916                                 } break;
 917
 918                                 case LC_SYMTAB: {
 919                                     struct symtab_command *symtab = reinterpret_cast<struct symtab_command *>(load_command);
 920                                     size = mach_header.Swap(symtab->stroff) + mach_header.Swap(symtab->strsize);
 921                                 } break;
 922                             }
 923                         }
 924                     }
 925
 926                     _assert(size != _not(uint32_t));
 927
 928                     _foreach (segment, mach_header.GetSegments("__LINKEDIT")) {
 929                         segment->filesize -= mach_header.GetSize() - size;
 930
 931                         if (fat_arch *fat_arch = mach_header.GetFatArch()) {
 932                             fat_arch->size = fat_header.Swap(size);
 933                             clip = std::max(clip, fat_header.Swap(fat_arch->offset) + size);
 934                         } else
 935                             clip = std::max(clip, size);
 936                     }
 937
 938                     _foreach (segment, mach_header.GetSegments64("__LINKEDIT")) {
 939                         segment->filesize -= mach_header.GetSize() - size;
 940
 941                         if (fat_arch *fat_arch = mach_header.GetFatArch()) {
 942                             fat_arch->size = fat_header.Swap(size);
 943                             clip = std::max(clip, fat_header.Swap(fat_arch->offset) + size);
 944                         } else
 945                             clip = std::max(clip, size);
 946                     }
 947                 }
 948             }
 949
 950             if (clip != 0)
 951                 _syscall(truncate(path, clip));
 952         }
 953
 954         if (flag_S) {
 955             FatHeader source(Map(path));
 956
 957             size_t offset(0);
 958
 959             if (source.IsFat())
 960                 offset += sizeof(fat_header) + sizeof(fat_arch) * source.Swap(source->nfat_arch);
 961
 962             std::vector<CodesignAllocation> allocations; {
 963                 _foreach (mach_header, source.GetMachHeaders()) {
 964                     if (flag_A) {
 965                         if (mach_header.GetCPUType() != flag_CPUType)
 966                             continue;
 967                         if (mach_header.GetCPUSubtype() != flag_CPUSubtype)
 968                             continue;
 969                     }
 970
 971                     mach_header->flags = mach_header.Swap(mach_header.Swap(mach_header->flags) | MH_DYLDLINK);
 972
 973                     size_t size(_not(size_t)); {
 974                         _foreach (load_command, mach_header.GetLoadCommands()) {
 975                             uint32_t cmd(mach_header.Swap(load_command->cmd));
 976                             if (cmd == LC_CODE_SIGNATURE) {
 977                                 struct linkedit_data_command *signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
 978                                 size = mach_header.Swap(signature->dataoff);
 979                                 _assert(size < mach_header.GetSize());
 980                                 break;
 981                             }
 982                         }
 983
 984                         if (size == _not(size_t))
 985                             size = mach_header.GetSize();
 986                     }
 987
 988                     size_t alloc(0);
 989                     alloc += sizeof(struct SuperBlob);
 990                     uint32_t special(0);
 991
 992                     special = std::max(special, CSSLOT_CODEDIRECTORY);
 993                     alloc += sizeof(struct BlobIndex);
 994                     alloc += sizeof(struct CodeDirectory);
 995                     alloc += strlen(name) + 1;
 996
 997                     special = std::max(special, CSSLOT_REQUIREMENTS);
 998                     alloc += sizeof(struct BlobIndex);
 999                     alloc += 0xc;
1000
1001                     if (xmld != NULL) {
1002                         special = std::max(special, CSSLOT_ENTITLEMENTS);
1003                         alloc += sizeof(struct BlobIndex);
1004                         alloc += sizeof(struct Blob);
1005                         alloc += xmls;
1006                     }
1007
1008                     size_t normal((size + 0x1000 - 1) / 0x1000);
1009                     alloc = Align(alloc + (special + normal) * 0x14, 16);
1010
1011                     auto *fat_arch(mach_header.GetFatArch());
1012                     uint32_t align(fat_arch == NULL ? 0 : source.Swap(fat_arch->align));
1013                     offset = Align(offset, 1 << align);
1014
1015                     allocations.push_back(CodesignAllocation(mach_header, offset, size, alloc, align));
1016                     offset += size + alloc;
1017                     offset = Align(offset, 16);
1018                 }
1019             }
1020
1021             asprintf(&temp, "%s.%s.cs", dir, base);
1022             fclose(fopen(temp, "w+"));
1023             _syscall(truncate(temp, offset));
1024
1025             void *file(map(temp, 0, offset, NULL, false));
1026             memset(file, 0, offset);
1027
1028             fat_arch *fat_arch;
1029             if (!source.IsFat())
1030                 fat_arch = NULL;
1031             else {
1032                 auto *fat_header(reinterpret_cast<struct fat_header *>(file));
1033                 fat_header->magic = Swap(FAT_MAGIC);
1034                 fat_header->nfat_arch = Swap(source.Swap(source->nfat_arch));
1035                 fat_arch = reinterpret_cast<struct fat_arch *>(fat_header + 1);
1036             }
1037
1038             _foreach (allocation, allocations) {
1039                 auto &source(allocation.mach_header_);
1040
1041                 uint32_t align(allocation.size_);
1042                 align = Align(align, 0x10);
1043
1044                 if (fat_arch != NULL) {
1045                     fat_arch->cputype = Swap(source->cputype);
1046                     fat_arch->cpusubtype = Swap(source->cpusubtype);
1047                     fat_arch->offset = Swap(allocation.offset_);
1048                     fat_arch->size = Swap(align + allocation.alloc_);
1049                     fat_arch->align = Swap(allocation.align_);
1050                     ++fat_arch;
1051                 }
1052
1053                 void *target(reinterpret_cast<uint8_t *>(file) + allocation.offset_);
1054                 memcpy(target, source, allocation.size_);
1055                 MachHeader mach_header(target, align + allocation.alloc_);
1056
1057                 struct linkedit_data_command *signature(NULL);
1058                 _foreach (load_command, mach_header.GetLoadCommands()) {
1059                     uint32_t cmd(mach_header.Swap(load_command->cmd));
1060                     if (cmd != LC_CODE_SIGNATURE)
1061                         continue;
1062                     signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
1063                     break;
1064                 }
1065
1066                 if (signature == NULL) {
1067                     mach_header->ncmds = mach_header.Swap(mach_header.Swap(mach_header->ncmds) + 1);
1068                     signature = reinterpret_cast<struct linkedit_data_command *>(reinterpret_cast<uint8_t *>(mach_header.GetLoadCommand()) + mach_header.Swap(mach_header->sizeofcmds));
1069                     mach_header->sizeofcmds = mach_header.Swap(mach_header.Swap(mach_header->sizeofcmds) + uint32_t(sizeof(*signature)));
1070                     signature->cmd = mach_header.Swap(LC_CODE_SIGNATURE);
1071                     signature->cmdsize = mach_header.Swap(uint32_t(sizeof(*signature)));
1072                 }
1073
1074                 signature->dataoff = mach_header.Swap(align);
1075                 signature->datasize = mach_header.Swap(allocation.alloc_);
1076
1077                 _foreach (segment, mach_header.GetSegments("__LINKEDIT")) {
1078                     size_t size(mach_header.Swap(align + allocation.alloc_ - mach_header.Swap(segment->fileoff)));
1079                     segment->filesize = size;
1080                     segment->vmsize = Align(size, 0x1000);
1081                 }
1082
1083                 _foreach (segment, mach_header.GetSegments64("__LINKEDIT")) {
1084                     size_t size(mach_header.Swap(align + allocation.alloc_ - mach_header.Swap(segment->fileoff)));
1085                     segment->filesize = size;
1086                     segment->vmsize = Align(size, 0x1000);
1087                 }
1088             }
1089         }
1090
1091         if (flag_p)
1092             printf("path%zu='%s'\n", filei, file.c_str());
1093
1094         FatHeader fat_header(Map(temp == NULL ? path : temp, !(flag_R || flag_T || flag_s || flag_S || flag_O || flag_D)));
1095         struct linkedit_data_command *signature(NULL);
1096
1097         _foreach (mach_header, fat_header.GetMachHeaders()) {
1098             if (flag_A) {
1099                 if (mach_header.GetCPUType() != flag_CPUType)
1100                     continue;
1101                 if (mach_header.GetCPUSubtype() != flag_CPUSubtype)
1102                     continue;
1103             }
1104
1105             if (flag_a)
1106                 printf("cpu=0x%x:0x%x\n", mach_header.GetCPUType(), mach_header.GetCPUSubtype());
1107
1108             if (flag_d) {
1109                 if (struct fat_arch *fat_arch = mach_header.GetFatArch())
1110                     printf("offset=0x%x\n", Swap(fat_arch->offset));
1111                 else
1112                     printf("offset=0x0\n");
1113             }
1114
1115             if (woffset != _not(uintptr_t)) {
1116                 Pointer<uint32_t> wvalue(mach_header.GetPointer<uint32_t>(woffset));
1117                 if (wvalue == NULL)
1118                     printf("(null) %p\n", reinterpret_cast<void *>(woffset));
1119                 else
1120                     printf("0x%.08x\n", *wvalue);
1121             }
1122
1123             if (noffset != _not(uintptr_t))
1124                 printf("%s\n", &*mach_header.GetPointer<char>(noffset));
1125
1126             if (flag_d)
1127                 _foreach(segment, mach_header.GetSegments("__TEXT")) {
1128                     printf("vmaddr=0x%x\n", mach_header.Swap(segment->vmaddr));
1129                     printf("fileoff=0x%x\n", mach_header.Swap(segment->fileoff));
1130                 }
1131
1132             if (flag_O) {
1133                 _foreach(section, mach_header.GetSections("__TEXT", "__text"))
1134                     section->addr = mach_header.Swap(0);
1135             }
1136
1137             _foreach (load_command, mach_header.GetLoadCommands()) {
1138                 uint32_t cmd(mach_header.Swap(load_command->cmd));
1139
1140                 if (flag_R && cmd == LC_REEXPORT_DYLIB)
1141                     load_command->cmd = mach_header.Swap(LC_LOAD_DYLIB);
1142                 else if (cmd == LC_CODE_SIGNATURE)
1143                     signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
1144                 else if (cmd == LC_UUID) {
1145                     volatile struct uuid_command *uuid_command(reinterpret_cast<struct uuid_command *>(load_command));
1146
1147                     if (flag_u) {
1148                         printf("uuid%zu=%.2x%.2x%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x%.2x%.2x%.2x%.2x\n", filei,
1149                             uuid_command->uuid[ 0], uuid_command->uuid[ 1], uuid_command->uuid[ 2], uuid_command->uuid[ 3],
1150                             uuid_command->uuid[ 4], uuid_command->uuid[ 5], uuid_command->uuid[ 6], uuid_command->uuid[ 7],
1151                             uuid_command->uuid[ 8], uuid_command->uuid[ 9], uuid_command->uuid[10], uuid_command->uuid[11],
1152                             uuid_command->uuid[12], uuid_command->uuid[13], uuid_command->uuid[14], uuid_command->uuid[15]
1153                         );
1154                     }
1155                 } else if (cmd == LC_ID_DYLIB) {
1156                     volatile struct dylib_command *dylib_command(reinterpret_cast<struct dylib_command *>(load_command));
1157
1158                     if (flag_t)
1159                         printf("time%zu=0x%.8x\n", filei, mach_header.Swap(dylib_command->dylib.timestamp));
1160
1161                     if (flag_T) {
1162                         uint32_t timed;
1163
1164                         if (!timeh)
1165                             timed = timev;
1166                         else {
1167                             dylib_command->dylib.timestamp = 0;
1168                             timed = hash(reinterpret_cast<uint8_t *>(mach_header.GetBase()), mach_header.GetSize(), timev);
1169                         }
1170
1171                         dylib_command->dylib.timestamp = mach_header.Swap(timed);
1172                     }
1173                 } else if (cmd == LC_ENCRYPTION_INFO) {
1174                     volatile struct encryption_info_command *encryption_info_command(reinterpret_cast<struct encryption_info_command *>(load_command));
1175
1176                     if (flag_D)
1177                         encryption_info_command->cryptid = mach_header.Swap(0);
1178
1179                     if (flag_d) {
1180                         printf("cryptoff=0x%x\n", mach_header.Swap(encryption_info_command->cryptoff));
1181                         printf("cryptsize=0x%x\n", mach_header.Swap(encryption_info_command->cryptsize));
1182                         printf("cryptid=0x%x\n", mach_header.Swap(encryption_info_command->cryptid));
1183                     }
1184                 }
1185             }
1186
1187             if (flag_e) {
1188                 _assert(signature != NULL);
1189
1190                 uint32_t data = mach_header.Swap(signature->dataoff);
1191
1192                 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
1193                 uint8_t *blob = top + data;
1194                 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
1195
1196                 for (size_t index(0); index != Swap(super->count); ++index)
1197                     if (Swap(super->index[index].type) == CSSLOT_ENTITLEMENTS) {
1198                         uint32_t begin = Swap(super->index[index].offset);
1199                         struct Blob *entitlements = reinterpret_cast<struct Blob *>(blob + begin);
1200                         fwrite(entitlements + 1, 1, Swap(entitlements->length) - sizeof(struct Blob), stdout);
1201                     }
1202             }
1203
1204             if (flag_s) {
1205                 _assert(signature != NULL);
1206
1207                 uint32_t data = mach_header.Swap(signature->dataoff);
1208
1209                 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
1210                 uint8_t *blob = top + data;
1211                 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
1212
1213                 for (size_t index(0); index != Swap(super->count); ++index)
1214                     if (Swap(super->index[index].type) == CSSLOT_CODEDIRECTORY) {
1215                         uint32_t begin = Swap(super->index[index].offset);
1216                         struct CodeDirectory *directory = reinterpret_cast<struct CodeDirectory *>(blob + begin);
1217
1218                         uint8_t (*hashes)[20] = reinterpret_cast<uint8_t (*)[20]>(blob + begin + Swap(directory->hashOffset));
1219                         uint32_t pages = Swap(directory->nCodeSlots);
1220
1221                         if (pages != 1)
1222                             for (size_t i = 0; i != pages - 1; ++i)
1223                                 sha1(hashes[i], top + 0x1000 * i, 0x1000);
1224                         if (pages != 0)
1225                             sha1(hashes[pages - 1], top + 0x1000 * (pages - 1), ((data - 1) % 0x1000) + 1);
1226                     }
1227             }
1228
1229             if (flag_S) {
1230                 _assert(signature != NULL);
1231
1232                 uint32_t data = mach_header.Swap(signature->dataoff);
1233                 uint32_t size = mach_header.Swap(signature->datasize);
1234
1235                 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
1236                 uint8_t *blob = top + data;
1237                 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
1238                 super->blob.magic = Swap(CSMAGIC_EMBEDDED_SIGNATURE);
1239
1240                 uint32_t count = xmld == NULL ? 2 : 3;
1241                 uint32_t offset = sizeof(struct SuperBlob) + count * sizeof(struct BlobIndex);
1242
1243                 super->index[0].type = Swap(CSSLOT_CODEDIRECTORY);
1244                 super->index[0].offset = Swap(offset);
1245
1246                 uint32_t begin = offset;
1247                 struct CodeDirectory *directory = reinterpret_cast<struct CodeDirectory *>(blob + begin);
1248                 offset += sizeof(struct CodeDirectory);
1249
1250                 directory->blob.magic = Swap(CSMAGIC_CODEDIRECTORY);
1251                 directory->version = Swap(uint32_t(0x00020001));
1252                 directory->flags = Swap(uint32_t(0));
1253                 directory->codeLimit = Swap(data);
1254                 directory->hashSize = 0x14;
1255                 directory->hashType = 0x01;
1256                 directory->spare1 = 0x00;
1257                 directory->pageSize = 0x0c;
1258                 directory->spare2 = Swap(uint32_t(0));
1259
1260                 directory->identOffset = Swap(offset - begin);
1261                 strcpy(reinterpret_cast<char *>(blob + offset), name);
1262                 offset += strlen(name) + 1;
1263
1264                 uint32_t special = xmld == NULL ? CSSLOT_REQUIREMENTS : CSSLOT_ENTITLEMENTS;
1265                 directory->nSpecialSlots = Swap(special);
1266
1267                 uint8_t (*hashes)[20] = reinterpret_cast<uint8_t (*)[20]>(blob + offset);
1268                 memset(hashes, 0, sizeof(*hashes) * special);
1269
1270                 offset += sizeof(*hashes) * special;
1271                 hashes += special;
1272
1273                 uint32_t pages = (data + 0x1000 - 1) / 0x1000;
1274                 directory->nCodeSlots = Swap(pages);
1275
1276                 if (pages != 1)
1277                     for (size_t i = 0; i != pages - 1; ++i)
1278                         sha1(hashes[i], top + 0x1000 * i, 0x1000);
1279                 if (pages != 0)
1280                     sha1(hashes[pages - 1], top + 0x1000 * (pages - 1), ((data - 1) % 0x1000) + 1);
1281
1282                 directory->hashOffset = Swap(offset - begin);
1283                 offset += sizeof(*hashes) * pages;
1284                 directory->blob.length = Swap(offset - begin);
1285
1286                 super->index[1].type = Swap(CSSLOT_REQUIREMENTS);
1287                 super->index[1].offset = Swap(offset);
1288
1289                 memcpy(blob + offset, "\xfa\xde\x0c\x01\x00\x00\x00\x0c\x00\x00\x00\x00", 0xc);
1290                 offset += 0xc;
1291
1292                 if (xmld != NULL) {
1293                     super->index[2].type = Swap(CSSLOT_ENTITLEMENTS);
1294                     super->index[2].offset = Swap(offset);
1295
1296                     uint32_t begin = offset;
1297                     struct Blob *entitlements = reinterpret_cast<struct Blob *>(blob + begin);
1298                     offset += sizeof(struct Blob);
1299
1300                     memcpy(blob + offset, xmld, xmls);
1301                     offset += xmls;
1302
1303                     entitlements->magic = Swap(CSMAGIC_ENTITLEMENTS);
1304                     entitlements->length = Swap(offset - begin);
1305                 }
1306
1307                 for (size_t index(0); index != count; ++index) {
1308                     uint32_t type = Swap(super->index[index].type);
1309                     if (type != 0 && type <= special) {
1310                         uint32_t offset = Swap(super->index[index].offset);
1311                         struct Blob *local = (struct Blob *) (blob + offset);
1312                         sha1((uint8_t *) (hashes - type), (uint8_t *) local, Swap(local->length));
1313                     }
1314                 }
1315
1316                 super->count = Swap(count);
1317                 super->blob.length = Swap(offset);
1318
1319                 if (offset > size) {
1320                     fprintf(stderr, "offset (%u) > size (%u)\n", offset, size);
1321                     _assert(false);
1322                 } //else fprintf(stderr, "offset (%zu) <= size (%zu)\n", offset, size);
1323
1324                 memset(blob + offset, 0, size - offset);
1325             }
1326         }
1327
1328         if (flag_S) {
1329             uint8_t *top = reinterpret_cast<uint8_t *>(fat_header.GetBase());
1330             size_t size = fat_header.GetSize();
1331
1332             char *copy;
1333             asprintf(&copy, "%s.%s.cp", dir, base);
1334             FILE *file = fopen(copy, "w+");
1335             size_t writ = fwrite(top, 1, size, file);
1336             _assert(writ == size);
1337             fclose(file);
1338
1339             _syscall(unlink(temp));
1340             free(temp);
1341             temp = copy;
1342         }
1343
1344         if (temp != NULL) {
1345             struct stat info;
1346             _syscall(stat(path, &info));
1347             _syscall(chown(temp, info.st_uid, info.st_gid));
1348             _syscall(chmod(temp, info.st_mode));
1349             _syscall(unlink(path));
1350             _syscall(rename(temp, path));
1351             free(temp);
1352         }
1353
1354         free(dir);
1355         ++filei;
1356     } catch (const char *) {
1357         ++filee;
1358         ++filei;
1359     }
1360
1361     return filee;
1362 }