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 #include <cstring>
  27 #include <string>
  28 #include <vector>
  29
  30 #include <openssl/sha.h>
  31
  32 #include <plist/plist.h>
  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     SHA1(data, size, hash);
 721 }
 722
 723 struct CodesignAllocation {
 724     FatMachHeader mach_header_;
 725     uint32_t offset_;
 726     uint32_t size_;
 727     uint32_t alloc_;
 728     uint32_t align_;
 729
 730     CodesignAllocation(FatMachHeader mach_header, size_t offset, size_t size, size_t alloc, size_t align) :
 731         mach_header_(mach_header),
 732         offset_(offset),
 733         size_(size),
 734         alloc_(alloc),
 735         align_(align)
 736     {
 737     }
 738 };
 739
 740 int main(int argc, const char *argv[]) {
 741     union {
 742         uint16_t word;
 743         uint8_t byte[2];
 744     } endian = {1};
 745
 746     little_ = endian.byte[0];
 747
 748     bool flag_R(false);
 749     bool flag_r(false);
 750
 751     bool flag_t(false);
 752     bool flag_p(false);
 753     bool flag_u(false);
 754     bool flag_e(false);
 755
 756     bool flag_T(false);
 757
 758     bool flag_S(false);
 759     bool flag_s(false);
 760
 761     bool flag_O(false);
 762
 763     bool flag_D(false);
 764     bool flag_d(false);
 765
 766     bool flag_A(false);
 767     bool flag_a(false);
 768
 769     uint32_t flag_CPUType(_not(uint32_t));
 770     uint32_t flag_CPUSubtype(_not(uint32_t));
 771
 772     const char *flag_I(NULL);
 773
 774     bool timeh(false);
 775     uint32_t timev(0);
 776
 777     const void *xmld(NULL);
 778     size_t xmls(0);
 779
 780     uintptr_t noffset(_not(uintptr_t));
 781     uintptr_t woffset(_not(uintptr_t));
 782
 783     std::vector<std::string> files;
 784
 785     if (argc == 1) {
 786         fprintf(stderr, "usage: %s -S[entitlements.xml] <binary>\n", argv[0]);
 787         fprintf(stderr, "   %s -e MobileSafari\n", argv[0]);
 788         fprintf(stderr, "   %s -S cat\n", argv[0]);
 789         fprintf(stderr, "   %s -Stfp.xml gdb\n", argv[0]);
 790         exit(0);
 791     }
 792
 793     for (int argi(1); argi != argc; ++argi)
 794         if (argv[argi][0] != '-')
 795             files.push_back(argv[argi]);
 796         else switch (argv[argi][1]) {
 797             case 'R': flag_R = true; break;
 798             case 'r': flag_r = true; break;
 799
 800             case 't': flag_t = true; break;
 801             case 'u': flag_u = true; break;
 802             case 'p': flag_p = true; break;
 803             case 'e': flag_e = true; break;
 804             case 'O': flag_O = true; break;
 805
 806             case 'D': flag_D = true; break;
 807             case 'd': flag_d = true; break;
 808
 809             case 'a': flag_a = true; break;
 810
 811             case 'A':
 812                 flag_A = true;
 813                 if (argv[argi][2] != '\0') {
 814                     const char *cpu = argv[argi] + 2;
 815                     const char *colon = strchr(cpu, ':');
 816                     _assert(colon != NULL);
 817                     char *arge;
 818                     flag_CPUType = strtoul(cpu, &arge, 0);
 819                     _assert(arge == colon);
 820                     flag_CPUSubtype = strtoul(colon + 1, &arge, 0);
 821                     _assert(arge == argv[argi] + strlen(argv[argi]));
 822                 }
 823             break;
 824
 825             case 's':
 826                 _assert(!flag_S);
 827                 flag_s = true;
 828             break;
 829
 830             case 'S':
 831                 _assert(!flag_s);
 832                 flag_S = true;
 833                 if (argv[argi][2] != '\0') {
 834                     const char *xml = argv[argi] + 2;
 835                     xmld = map(xml, 0, _not(size_t), &xmls, true);
 836                 }
 837             break;
 838
 839             case 'T': {
 840                 flag_T = true;
 841                 if (argv[argi][2] == '-')
 842                     timeh = true;
 843                 else {
 844                     char *arge;
 845                     timev = strtoul(argv[argi] + 2, &arge, 0);
 846                     _assert(arge == argv[argi] + strlen(argv[argi]));
 847                 }
 848             } break;
 849
 850             case 'I': {
 851                 flag_I = argv[argi] + 2;
 852             } break;
 853
 854             case 'n': {
 855                 char *arge;
 856                 noffset = strtoul(argv[argi] + 2, &arge, 0);
 857                 _assert(arge == argv[argi] + strlen(argv[argi]));
 858             } break;
 859
 860             case 'w': {
 861                 char *arge;
 862                 woffset = strtoul(argv[argi] + 2, &arge, 0);
 863                 _assert(arge == argv[argi] + strlen(argv[argi]));
 864             } break;
 865
 866             default:
 867                 goto usage;
 868             break;
 869         }
 870
 871     if (files.empty()) usage: {
 872         exit(0);
 873     }
 874
 875     size_t filei(0), filee(0);
 876     _foreach (file, files) try {
 877         const char *path(file.c_str());
 878         const char *base = strrchr(path, '/');
 879         char *temp(NULL), *dir;
 880
 881         if (base != NULL)
 882             dir = strndup_(path, base++ - path + 1);
 883         else {
 884             dir = strdup("");
 885             base = path;
 886         }
 887
 888         const char *name(flag_I ?: base);
 889
 890         if (flag_r) {
 891             uint32_t clip(0); {
 892                 FatHeader fat_header(Map(path));
 893                 _foreach (mach_header, fat_header.GetMachHeaders()) {
 894                     if (flag_A) {
 895                         if (mach_header.GetCPUType() != flag_CPUType)
 896                             continue;
 897                         if (mach_header.GetCPUSubtype() != flag_CPUSubtype)
 898                             continue;
 899                     }
 900
 901                     mach_header->flags = mach_header.Swap(mach_header.Swap(mach_header->flags) | MH_DYLDLINK);
 902
 903                     uint32_t size(_not(uint32_t)); {
 904                         _foreach (load_command, mach_header.GetLoadCommands()) {
 905                             switch (mach_header.Swap(load_command->cmd)) {
 906                                 case LC_CODE_SIGNATURE: {
 907                                     struct linkedit_data_command *signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
 908                                     memset(reinterpret_cast<uint8_t *>(mach_header.GetBase()) + mach_header.Swap(signature->dataoff), 0, mach_header.Swap(signature->datasize));
 909                                     memset(signature, 0, sizeof(struct linkedit_data_command));
 910
 911                                     mach_header->ncmds = mach_header.Swap(mach_header.Swap(mach_header->ncmds) - 1);
 912                                     mach_header->sizeofcmds = mach_header.Swap(uint32_t(mach_header.Swap(mach_header->sizeofcmds) - sizeof(struct linkedit_data_command)));
 913                                 } break;
 914
 915                                 case LC_SYMTAB: {
 916                                     struct symtab_command *symtab = reinterpret_cast<struct symtab_command *>(load_command);
 917                                     size = mach_header.Swap(symtab->stroff) + mach_header.Swap(symtab->strsize);
 918                                 } break;
 919                             }
 920                         }
 921                     }
 922
 923                     _assert(size != _not(uint32_t));
 924
 925                     _foreach (segment, mach_header.GetSegments("__LINKEDIT")) {
 926                         segment->filesize -= mach_header.GetSize() - size;
 927
 928                         if (fat_arch *fat_arch = mach_header.GetFatArch()) {
 929                             fat_arch->size = fat_header.Swap(size);
 930                             clip = std::max(clip, fat_header.Swap(fat_arch->offset) + size);
 931                         } else
 932                             clip = std::max(clip, size);
 933                     }
 934
 935                     _foreach (segment, mach_header.GetSegments64("__LINKEDIT")) {
 936                         segment->filesize -= mach_header.GetSize() - size;
 937
 938                         if (fat_arch *fat_arch = mach_header.GetFatArch()) {
 939                             fat_arch->size = fat_header.Swap(size);
 940                             clip = std::max(clip, fat_header.Swap(fat_arch->offset) + size);
 941                         } else
 942                             clip = std::max(clip, size);
 943                     }
 944                 }
 945             }
 946
 947             if (clip != 0)
 948                 _syscall(truncate(path, clip));
 949         }
 950
 951         if (flag_S) {
 952             FatHeader source(Map(path));
 953
 954             size_t offset(0);
 955
 956             if (source.IsFat())
 957                 offset += sizeof(fat_header) + sizeof(fat_arch) * source.Swap(source->nfat_arch);
 958
 959             std::vector<CodesignAllocation> allocations; {
 960                 _foreach (mach_header, source.GetMachHeaders()) {
 961                     if (flag_A) {
 962                         if (mach_header.GetCPUType() != flag_CPUType)
 963                             continue;
 964                         if (mach_header.GetCPUSubtype() != flag_CPUSubtype)
 965                             continue;
 966                     }
 967
 968                     mach_header->flags = mach_header.Swap(mach_header.Swap(mach_header->flags) | MH_DYLDLINK);
 969
 970                     size_t size(_not(size_t)); {
 971                         _foreach (load_command, mach_header.GetLoadCommands()) {
 972                             uint32_t cmd(mach_header.Swap(load_command->cmd));
 973                             if (cmd == LC_CODE_SIGNATURE) {
 974                                 struct linkedit_data_command *signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
 975                                 size = mach_header.Swap(signature->dataoff);
 976                                 _assert(size < mach_header.GetSize());
 977                                 break;
 978                             }
 979                         }
 980
 981                         if (size == _not(size_t))
 982                             size = mach_header.GetSize();
 983                     }
 984
 985                     size_t alloc(0);
 986                     alloc += sizeof(struct SuperBlob);
 987                     uint32_t special(0);
 988
 989                     special = std::max(special, CSSLOT_CODEDIRECTORY);
 990                     alloc += sizeof(struct BlobIndex);
 991                     alloc += sizeof(struct CodeDirectory);
 992                     alloc += strlen(name) + 1;
 993
 994                     special = std::max(special, CSSLOT_REQUIREMENTS);
 995                     alloc += sizeof(struct BlobIndex);
 996                     alloc += 0xc;
 997
 998                     if (xmld != NULL) {
 999                         special = std::max(special, CSSLOT_ENTITLEMENTS);
1000                         alloc += sizeof(struct BlobIndex);
1001                         alloc += sizeof(struct Blob);
1002                         alloc += xmls;
1003                     }
1004
1005                     size_t normal((size + 0x1000 - 1) / 0x1000);
1006                     alloc = Align(alloc + (special + normal) * 0x14, 16);
1007
1008                     auto *fat_arch(mach_header.GetFatArch());
1009                     uint32_t align(fat_arch == NULL ? 0 : source.Swap(fat_arch->align));
1010                     offset = Align(offset, 1 << align);
1011
1012                     allocations.push_back(CodesignAllocation(mach_header, offset, size, alloc, align));
1013                     offset += size + alloc;
1014                     offset = Align(offset, 16);
1015                 }
1016             }
1017
1018             asprintf(&temp, "%s.%s.cs", dir, base);
1019             fclose(fopen(temp, "w+"));
1020             _syscall(truncate(temp, offset));
1021
1022             void *file(map(temp, 0, offset, NULL, false));
1023             memset(file, 0, offset);
1024
1025             fat_arch *fat_arch;
1026             if (!source.IsFat())
1027                 fat_arch = NULL;
1028             else {
1029                 auto *fat_header(reinterpret_cast<struct fat_header *>(file));
1030                 fat_header->magic = Swap(FAT_MAGIC);
1031                 fat_header->nfat_arch = Swap(source.Swap(source->nfat_arch));
1032                 fat_arch = reinterpret_cast<struct fat_arch *>(fat_header + 1);
1033             }
1034
1035             _foreach (allocation, allocations) {
1036                 auto &source(allocation.mach_header_);
1037
1038                 uint32_t align(allocation.size_);
1039                 align = Align(align, 0x10);
1040
1041                 if (fat_arch != NULL) {
1042                     fat_arch->cputype = Swap(source->cputype);
1043                     fat_arch->cpusubtype = Swap(source->cpusubtype);
1044                     fat_arch->offset = Swap(allocation.offset_);
1045                     fat_arch->size = Swap(align + allocation.alloc_);
1046                     fat_arch->align = Swap(allocation.align_);
1047                     ++fat_arch;
1048                 }
1049
1050                 void *target(reinterpret_cast<uint8_t *>(file) + allocation.offset_);
1051                 memcpy(target, source, allocation.size_);
1052                 MachHeader mach_header(target, align + allocation.alloc_);
1053
1054                 struct linkedit_data_command *signature(NULL);
1055                 _foreach (load_command, mach_header.GetLoadCommands()) {
1056                     uint32_t cmd(mach_header.Swap(load_command->cmd));
1057                     if (cmd != LC_CODE_SIGNATURE)
1058                         continue;
1059                     signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
1060                     break;
1061                 }
1062
1063                 if (signature == NULL) {
1064                     mach_header->ncmds = mach_header.Swap(mach_header.Swap(mach_header->ncmds) + 1);
1065                     signature = reinterpret_cast<struct linkedit_data_command *>(reinterpret_cast<uint8_t *>(mach_header.GetLoadCommand()) + mach_header.Swap(mach_header->sizeofcmds));
1066                     mach_header->sizeofcmds = mach_header.Swap(mach_header.Swap(mach_header->sizeofcmds) + uint32_t(sizeof(*signature)));
1067                     signature->cmd = mach_header.Swap(LC_CODE_SIGNATURE);
1068                     signature->cmdsize = mach_header.Swap(uint32_t(sizeof(*signature)));
1069                 }
1070
1071                 signature->dataoff = mach_header.Swap(align);
1072                 signature->datasize = mach_header.Swap(allocation.alloc_);
1073
1074                 _foreach (segment, mach_header.GetSegments("__LINKEDIT")) {
1075                     size_t size(mach_header.Swap(align + allocation.alloc_ - mach_header.Swap(segment->fileoff)));
1076                     segment->filesize = size;
1077                     segment->vmsize = Align(size, 0x1000);
1078                 }
1079
1080                 _foreach (segment, mach_header.GetSegments64("__LINKEDIT")) {
1081                     size_t size(mach_header.Swap(align + allocation.alloc_ - mach_header.Swap(segment->fileoff)));
1082                     segment->filesize = size;
1083                     segment->vmsize = Align(size, 0x1000);
1084                 }
1085             }
1086         }
1087
1088         if (flag_p)
1089             printf("path%zu='%s'\n", filei, file.c_str());
1090
1091         FatHeader fat_header(Map(temp == NULL ? path : temp, !(flag_R || flag_T || flag_s || flag_S || flag_O || flag_D)));
1092
1093         _foreach (mach_header, fat_header.GetMachHeaders()) {
1094             struct linkedit_data_command *signature(NULL);
1095             struct encryption_info_command *encryption(NULL);
1096
1097             if (flag_A) {
1098                 if (mach_header.GetCPUType() != flag_CPUType)
1099                     continue;
1100                 if (mach_header.GetCPUSubtype() != flag_CPUSubtype)
1101                     continue;
1102             }
1103
1104             if (flag_a)
1105                 printf("cpu=0x%x:0x%x\n", mach_header.GetCPUType(), mach_header.GetCPUSubtype());
1106
1107             if (flag_d) {
1108                 if (struct fat_arch *fat_arch = mach_header.GetFatArch())
1109                     printf("offset=0x%x\n", Swap(fat_arch->offset));
1110                 else
1111                     printf("offset=0x0\n");
1112             }
1113
1114             if (woffset != _not(uintptr_t)) {
1115                 Pointer<uint32_t> wvalue(mach_header.GetPointer<uint32_t>(woffset));
1116                 if (wvalue == NULL)
1117                     printf("(null) %p\n", reinterpret_cast<void *>(woffset));
1118                 else
1119                     printf("0x%.08x\n", *wvalue);
1120             }
1121
1122             if (noffset != _not(uintptr_t))
1123                 printf("%s\n", &*mach_header.GetPointer<char>(noffset));
1124
1125             if (flag_d)
1126                 _foreach(segment, mach_header.GetSegments("__TEXT")) {
1127                     printf("vmaddr=0x%x\n", mach_header.Swap(segment->vmaddr));
1128                     printf("fileoff=0x%x\n", mach_header.Swap(segment->fileoff));
1129                 }
1130
1131             if (flag_O) {
1132                 _foreach(section, mach_header.GetSections("__TEXT", "__text"))
1133                     section->addr = mach_header.Swap(0);
1134             }
1135
1136             _foreach (load_command, mach_header.GetLoadCommands()) {
1137                 uint32_t cmd(mach_header.Swap(load_command->cmd));
1138
1139                 if (flag_R && cmd == LC_REEXPORT_DYLIB)
1140                     load_command->cmd = mach_header.Swap(LC_LOAD_DYLIB);
1141                 else if (cmd == LC_CODE_SIGNATURE)
1142                     signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
1143                 else if (cmd == LC_ENCRYPTION_INFO)
1144                     encryption = reinterpret_cast<struct encryption_info_command *>(load_command);
1145                 else if (cmd == LC_UUID) {
1146                     volatile struct uuid_command *uuid_command(reinterpret_cast<struct uuid_command *>(load_command));
1147
1148                     if (flag_u) {
1149                         printf("uuid%zu=%.2x%.2x%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x%.2x%.2x%.2x%.2x\n", filei,
1150                             uuid_command->uuid[ 0], uuid_command->uuid[ 1], uuid_command->uuid[ 2], uuid_command->uuid[ 3],
1151                             uuid_command->uuid[ 4], uuid_command->uuid[ 5], uuid_command->uuid[ 6], uuid_command->uuid[ 7],
1152                             uuid_command->uuid[ 8], uuid_command->uuid[ 9], uuid_command->uuid[10], uuid_command->uuid[11],
1153                             uuid_command->uuid[12], uuid_command->uuid[13], uuid_command->uuid[14], uuid_command->uuid[15]
1154                         );
1155                     }
1156                 } else if (cmd == LC_ID_DYLIB) {
1157                     volatile struct dylib_command *dylib_command(reinterpret_cast<struct dylib_command *>(load_command));
1158
1159                     if (flag_t)
1160                         printf("time%zu=0x%.8x\n", filei, mach_header.Swap(dylib_command->dylib.timestamp));
1161
1162                     if (flag_T) {
1163                         uint32_t timed;
1164
1165                         if (!timeh)
1166                             timed = timev;
1167                         else {
1168                             dylib_command->dylib.timestamp = 0;
1169                             timed = hash(reinterpret_cast<uint8_t *>(mach_header.GetBase()), mach_header.GetSize(), timev);
1170                         }
1171
1172                         dylib_command->dylib.timestamp = mach_header.Swap(timed);
1173                     }
1174                 }
1175             }
1176
1177             if (flag_d) {
1178                 _assert(encryption != NULL);
1179
1180                 printf("cryptoff=0x%x\n", mach_header.Swap(encryption->cryptoff));
1181                 printf("cryptsize=0x%x\n", mach_header.Swap(encryption->cryptsize));
1182                 printf("cryptid=0x%x\n", mach_header.Swap(encryption->cryptid));
1183             }
1184
1185             if (flag_D) {
1186                 _assert(encryption != NULL);
1187                 encryption->cryptid = mach_header.Swap(0);
1188             }
1189
1190             if (flag_e) {
1191                 _assert(signature != NULL);
1192
1193                 uint32_t data = mach_header.Swap(signature->dataoff);
1194
1195                 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
1196                 uint8_t *blob = top + data;
1197                 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
1198
1199                 for (size_t index(0); index != Swap(super->count); ++index)
1200                     if (Swap(super->index[index].type) == CSSLOT_ENTITLEMENTS) {
1201                         uint32_t begin = Swap(super->index[index].offset);
1202                         struct Blob *entitlements = reinterpret_cast<struct Blob *>(blob + begin);
1203                         fwrite(entitlements + 1, 1, Swap(entitlements->length) - sizeof(struct Blob), stdout);
1204                     }
1205             }
1206
1207             if (flag_s) {
1208                 _assert(signature != NULL);
1209
1210                 uint32_t data = mach_header.Swap(signature->dataoff);
1211
1212                 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
1213                 uint8_t *blob = top + data;
1214                 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
1215
1216                 for (size_t index(0); index != Swap(super->count); ++index)
1217                     if (Swap(super->index[index].type) == CSSLOT_CODEDIRECTORY) {
1218                         uint32_t begin = Swap(super->index[index].offset);
1219                         struct CodeDirectory *directory = reinterpret_cast<struct CodeDirectory *>(blob + begin);
1220
1221                         uint8_t (*hashes)[20] = reinterpret_cast<uint8_t (*)[20]>(blob + begin + Swap(directory->hashOffset));
1222                         uint32_t pages = Swap(directory->nCodeSlots);
1223
1224                         if (pages != 1)
1225                             for (size_t i = 0; i != pages - 1; ++i)
1226                                 sha1(hashes[i], top + 0x1000 * i, 0x1000);
1227                         if (pages != 0)
1228                             sha1(hashes[pages - 1], top + 0x1000 * (pages - 1), ((data - 1) % 0x1000) + 1);
1229                     }
1230             }
1231
1232             if (flag_S) {
1233                 _assert(signature != NULL);
1234
1235                 uint32_t data = mach_header.Swap(signature->dataoff);
1236                 uint32_t size = mach_header.Swap(signature->datasize);
1237
1238                 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
1239                 uint8_t *blob = top + data;
1240                 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
1241                 super->blob.magic = Swap(CSMAGIC_EMBEDDED_SIGNATURE);
1242
1243                 uint32_t count = xmld == NULL ? 2 : 3;
1244                 uint32_t offset = sizeof(struct SuperBlob) + count * sizeof(struct BlobIndex);
1245
1246                 super->index[0].type = Swap(CSSLOT_CODEDIRECTORY);
1247                 super->index[0].offset = Swap(offset);
1248
1249                 uint32_t begin = offset;
1250                 struct CodeDirectory *directory = reinterpret_cast<struct CodeDirectory *>(blob + begin);
1251                 offset += sizeof(struct CodeDirectory);
1252
1253                 directory->blob.magic = Swap(CSMAGIC_CODEDIRECTORY);
1254                 directory->version = Swap(uint32_t(0x00020001));
1255                 directory->flags = Swap(uint32_t(0));
1256                 directory->codeLimit = Swap(data);
1257                 directory->hashSize = 0x14;
1258                 directory->hashType = 0x01;
1259                 directory->spare1 = 0x00;
1260                 directory->pageSize = 0x0c;
1261                 directory->spare2 = Swap(uint32_t(0));
1262
1263                 directory->identOffset = Swap(offset - begin);
1264                 strcpy(reinterpret_cast<char *>(blob + offset), name);
1265                 offset += strlen(name) + 1;
1266
1267                 uint32_t special = xmld == NULL ? CSSLOT_REQUIREMENTS : CSSLOT_ENTITLEMENTS;
1268                 directory->nSpecialSlots = Swap(special);
1269
1270                 uint8_t (*hashes)[20] = reinterpret_cast<uint8_t (*)[20]>(blob + offset);
1271                 memset(hashes, 0, sizeof(*hashes) * special);
1272
1273                 offset += sizeof(*hashes) * special;
1274                 hashes += special;
1275
1276                 uint32_t pages = (data + 0x1000 - 1) / 0x1000;
1277                 directory->nCodeSlots = Swap(pages);
1278
1279                 if (pages != 1)
1280                     for (size_t i = 0; i != pages - 1; ++i)
1281                         sha1(hashes[i], top + 0x1000 * i, 0x1000);
1282                 if (pages != 0)
1283                     sha1(hashes[pages - 1], top + 0x1000 * (pages - 1), ((data - 1) % 0x1000) + 1);
1284
1285                 directory->hashOffset = Swap(offset - begin);
1286                 offset += sizeof(*hashes) * pages;
1287                 directory->blob.length = Swap(offset - begin);
1288
1289                 super->index[1].type = Swap(CSSLOT_REQUIREMENTS);
1290                 super->index[1].offset = Swap(offset);
1291
1292                 memcpy(blob + offset, "\xfa\xde\x0c\x01\x00\x00\x00\x0c\x00\x00\x00\x00", 0xc);
1293                 offset += 0xc;
1294
1295                 if (xmld != NULL) {
1296                     super->index[2].type = Swap(CSSLOT_ENTITLEMENTS);
1297                     super->index[2].offset = Swap(offset);
1298
1299                     uint32_t begin = offset;
1300                     struct Blob *entitlements = reinterpret_cast<struct Blob *>(blob + begin);
1301                     offset += sizeof(struct Blob);
1302
1303                     memcpy(blob + offset, xmld, xmls);
1304                     offset += xmls;
1305
1306                     entitlements->magic = Swap(CSMAGIC_ENTITLEMENTS);
1307                     entitlements->length = Swap(offset - begin);
1308                 }
1309
1310                 for (size_t index(0); index != count; ++index) {
1311                     uint32_t type = Swap(super->index[index].type);
1312                     if (type != 0 && type <= special) {
1313                         uint32_t offset = Swap(super->index[index].offset);
1314                         struct Blob *local = (struct Blob *) (blob + offset);
1315                         sha1((uint8_t *) (hashes - type), (uint8_t *) local, Swap(local->length));
1316                     }
1317                 }
1318
1319                 super->count = Swap(count);
1320                 super->blob.length = Swap(offset);
1321
1322                 if (offset > size) {
1323                     fprintf(stderr, "offset (%u) > size (%u)\n", offset, size);
1324                     _assert(false);
1325                 } //else fprintf(stderr, "offset (%zu) <= size (%zu)\n", offset, size);
1326
1327                 memset(blob + offset, 0, size - offset);
1328             }
1329         }
1330
1331         if (flag_S) {
1332             uint8_t *top = reinterpret_cast<uint8_t *>(fat_header.GetBase());
1333             size_t size = fat_header.GetSize();
1334
1335             char *copy;
1336             asprintf(&copy, "%s.%s.cp", dir, base);
1337             FILE *file = fopen(copy, "w+");
1338             size_t writ = fwrite(top, 1, size, file);
1339             _assert(writ == size);
1340             fclose(file);
1341
1342             _syscall(unlink(temp));
1343             free(temp);
1344             temp = copy;
1345         }
1346
1347         if (temp != NULL) {
1348             struct stat info;
1349             _syscall(stat(path, &info));
1350             _syscall(chown(temp, info.st_uid, info.st_gid));
1351             _syscall(chmod(temp, info.st_mode));
1352             _syscall(unlink(path));
1353             _syscall(rename(temp, path));
1354             free(temp);
1355         }
1356
1357         free(dir);
1358         ++filei;
1359     } catch (const char *) {
1360         ++filee;
1361         ++filei;
1362     }
1363
1364     return filee;
1365 }