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--- dyld/dyld-360.22/launch-cache/dsc_extractor.cpp
+++ /dev/null
@@ -1,669 +0,0 @@
-/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
- *
- * Copyright (c) 2011 Apple Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <sys/stat.h>
-#include <string.h>
-#include <fcntl.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <sys/mman.h>
-#include <sys/syslimits.h>
-#include <libkern/OSByteOrder.h>
-#include <mach-o/fat.h>
-#include <mach-o/arch.h>
-#include <mach-o/loader.h>
-#include <Availability.h>
-
-#define NO_ULEB
-#include "Architectures.hpp"
-#include "MachOFileAbstraction.hpp"
-#include "CacheFileAbstraction.hpp"
-
-#include "dsc_iterator.h"
-#include "dsc_extractor.h"
-#include "MachOTrie.hpp"
-
-#include <vector>
-#include <set>
-#include <map>
-#include <unordered_map>
-#include <algorithm>
-#include <dispatch/dispatch.h>
-
-struct seg_info
-{
- seg_info(const char* n, uint64_t o, uint64_t s)
- : segName(n), offset(o), sizem(s) { }
- const char* segName;
- uint64_t offset;
- uint64_t sizem;
-};
-
-class CStringHash {
-public:
- size_t operator()(const char* __s) const {
- size_t __h = 0;
- for ( ; *__s; ++__s)
- __h = 5 * __h + *__s;
- return __h;
- };
-};
-class CStringEquals {
-public:
- bool operator()(const char* left, const char* right) const { return (strcmp(left, right) == 0); }
-};
-typedef std::unordered_map<const char*, std::vector<seg_info>, CStringHash, CStringEquals> NameToSegments;
-
-// Filter to find individual symbol re-exports in trie
-class NotReExportSymbol {
-public:
- NotReExportSymbol(const std::set<int> &rd) :_reexportDeps(rd) {}
- bool operator()(const mach_o::trie::Entry &entry) const {
- bool result = isSymbolReExport(entry);
- if (result) {
- // <rdar://problem/17671438> Xcode 6 leaks in dyld_shared_cache_extract_dylibs
- ::free((void*)entry.name);
- const_cast<mach_o::trie::Entry*>(&entry)->name = NULL;
- }
- return result;
- }
-private:
- bool isSymbolReExport(const mach_o::trie::Entry &entry) const {
- if ( (entry.flags & EXPORT_SYMBOL_FLAGS_KIND_MASK) != EXPORT_SYMBOL_FLAGS_KIND_REGULAR )
- return true;
- if ( (entry.flags & EXPORT_SYMBOL_FLAGS_REEXPORT) == 0 )
- return true;
- // If the symbol comes from a dylib that is re-exported, this is not an individual symbol re-export
- if ( _reexportDeps.count(entry.other) != 0 )
- return true;
- return false;
- }
- const std::set<int> &_reexportDeps;
-};
-
-
-template <typename A>
-int optimize_linkedit(macho_header<typename A::P>* mh, uint64_t textOffsetInCache, const void* mapped_cache, uint64_t* newSize)
-{
- typedef typename A::P P;
- typedef typename A::P::E E;
- typedef typename A::P::uint_t pint_t;
-
- // update header flags
- mh->set_flags(mh->flags() & 0x7FFFFFFF); // remove in-cache bit
-
- // update load commands
- uint64_t cumulativeFileSize = 0;
- const macho_load_command<P>* const cmds = (macho_load_command<P>*)((uint8_t*)mh + sizeof(macho_header<P>));
- const uint32_t cmd_count = mh->ncmds();
- const macho_load_command<P>* cmd = cmds;
- macho_segment_command<P>* linkEditSegCmd = NULL;
- macho_symtab_command<P>* symtab = NULL;
- macho_dysymtab_command<P>* dynamicSymTab = NULL;
- macho_linkedit_data_command<P>* functionStarts = NULL;
- macho_linkedit_data_command<P>* dataInCode = NULL;
- uint32_t exportsTrieOffset = 0;
- uint32_t exportsTrieSize = 0;
- std::set<int> reexportDeps;
- int depIndex = 0;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- switch ( cmd->cmd() ) {
- case macho_segment_command<P>::CMD:
- {
- // update segment/section file offsets
- macho_segment_command<P>* segCmd = (macho_segment_command<P>*)cmd;
- segCmd->set_fileoff(cumulativeFileSize);
- macho_section<P>* const sectionsStart = (macho_section<P>*)((char*)segCmd + sizeof(macho_segment_command<P>));
- macho_section<P>* const sectionsEnd = §ionsStart[segCmd->nsects()];
- for(macho_section<P>* sect = sectionsStart; sect < sectionsEnd; ++sect) {
- if ( sect->offset() != 0 )
- sect->set_offset((uint32_t)(cumulativeFileSize+sect->addr()-segCmd->vmaddr()));
- }
- if ( strcmp(segCmd->segname(), "__LINKEDIT") == 0 ) {
- linkEditSegCmd = segCmd;
- }
- cumulativeFileSize += segCmd->filesize();
- }
- break;
- case LC_DYLD_INFO_ONLY:
- {
- // zero out all dyld info
- macho_dyld_info_command<P>* dyldInfo = (macho_dyld_info_command<P>*)cmd;
- exportsTrieOffset = dyldInfo->export_off();
- exportsTrieSize = dyldInfo->export_size();
- dyldInfo->set_rebase_off(0);
- dyldInfo->set_rebase_size(0);
- dyldInfo->set_bind_off(0);
- dyldInfo->set_bind_size(0);
- dyldInfo->set_weak_bind_off(0);
- dyldInfo->set_weak_bind_size(0);
- dyldInfo->set_lazy_bind_off(0);
- dyldInfo->set_lazy_bind_size(0);
- dyldInfo->set_export_off(0);
- dyldInfo->set_export_size(0);
- }
- break;
- case LC_SYMTAB:
- symtab = (macho_symtab_command<P>*)cmd;
- break;
- case LC_DYSYMTAB:
- dynamicSymTab = (macho_dysymtab_command<P>*)cmd;
- break;
- case LC_FUNCTION_STARTS:
- functionStarts = (macho_linkedit_data_command<P>*)cmd;
- break;
- case LC_DATA_IN_CODE:
- dataInCode = (macho_linkedit_data_command<P>*)cmd;
- break;
- case LC_LOAD_DYLIB:
- case LC_LOAD_WEAK_DYLIB:
- case LC_REEXPORT_DYLIB:
- case LC_LOAD_UPWARD_DYLIB:
- ++depIndex;
- if ( cmd->cmd() == LC_REEXPORT_DYLIB ) {
- reexportDeps.insert(depIndex);
- }
- break;
- }
- cmd = (const macho_load_command<P>*)(((uint8_t*)cmd)+cmd->cmdsize());
- }
-
- // rebuild symbol table
- if ( linkEditSegCmd == NULL ) {
- fprintf(stderr, "__LINKEDIT not found\n");
- return -1;
- }
- if ( symtab == NULL ) {
- fprintf(stderr, "LC_SYMTAB not found\n");
- return -1;
- }
- if ( dynamicSymTab == NULL ) {
- fprintf(stderr, "LC_DYSYMTAB not found\n");
- return -1;
- }
-
- const uint64_t newFunctionStartsOffset = linkEditSegCmd->fileoff();
- uint32_t functionStartsSize = 0;
- if ( functionStarts != NULL ) {
- // copy function starts from original cache file to new mapped dylib file
- functionStartsSize = functionStarts->datasize();
- memcpy((char*)mh + newFunctionStartsOffset, (char*)mapped_cache + functionStarts->dataoff(), functionStartsSize);
- }
- const uint64_t newDataInCodeOffset = (newFunctionStartsOffset + functionStartsSize + sizeof(pint_t) - 1) & (-sizeof(pint_t)); // pointer align
- uint32_t dataInCodeSize = 0;
- if ( dataInCode != NULL ) {
- // copy data-in-code info from original cache file to new mapped dylib file
- dataInCodeSize = dataInCode->datasize();
- memcpy((char*)mh + newDataInCodeOffset, (char*)mapped_cache + dataInCode->dataoff(), dataInCodeSize);
- }
-
- std::vector<mach_o::trie::Entry> exports;
- if ( exportsTrieSize != 0 ) {
- const uint8_t* exportsStart = ((uint8_t*)mapped_cache) + exportsTrieOffset;
- const uint8_t* exportsEnd = &exportsStart[exportsTrieSize];
- mach_o::trie::parseTrie(exportsStart, exportsEnd, exports);
- exports.erase(std::remove_if(exports.begin(), exports.end(), NotReExportSymbol(reexportDeps)), exports.end());
- }
-
- // look for local symbol info in unmapped part of shared cache
- dyldCacheHeader<E>* header = (dyldCacheHeader<E>*)mapped_cache;
- macho_nlist<P>* localNlists = NULL;
- uint32_t localNlistCount = 0;
- const char* localStrings = NULL;
- const char* localStringsEnd = NULL;
- if ( header->mappingOffset() > offsetof(dyld_cache_header,localSymbolsSize) ) {
- dyldCacheLocalSymbolsInfo<E>* localInfo = (dyldCacheLocalSymbolsInfo<E>*)(((uint8_t*)mapped_cache) + header->localSymbolsOffset());
- dyldCacheLocalSymbolEntry<E>* entries = (dyldCacheLocalSymbolEntry<E>*)(((uint8_t*)mapped_cache) + header->localSymbolsOffset() + localInfo->entriesOffset());
- macho_nlist<P>* allLocalNlists = (macho_nlist<P>*)(((uint8_t*)localInfo) + localInfo->nlistOffset());
- const uint32_t entriesCount = localInfo->entriesCount();
- for (uint32_t i=0; i < entriesCount; ++i) {
- if ( entries[i].dylibOffset() == textOffsetInCache ) {
- uint32_t localNlistStart = entries[i].nlistStartIndex();
- localNlistCount = entries[i].nlistCount();
- localNlists = &allLocalNlists[localNlistStart];
- localStrings = ((char*)localInfo) + localInfo->stringsOffset();
- localStringsEnd = &localStrings[localInfo->stringsSize()];
- break;
- }
- }
- }
- // compute number of symbols in new symbol table
- const macho_nlist<P>* const mergedSymTabStart = (macho_nlist<P>*)(((uint8_t*)mapped_cache) + symtab->symoff());
- const macho_nlist<P>* const mergedSymTabend = &mergedSymTabStart[symtab->nsyms()];
- uint32_t newSymCount = symtab->nsyms();
- if ( localNlists != NULL ) {
- newSymCount = localNlistCount;
- for (const macho_nlist<P>* s = mergedSymTabStart; s != mergedSymTabend; ++s) {
- // skip any locals in cache
- if ( (s->n_type() & (N_TYPE|N_EXT)) == N_SECT )
- continue;
- ++newSymCount;
- }
- }
-
- // add room for N_INDR symbols for re-exported symbols
- newSymCount += exports.size();
-
- // copy symbol entries and strings from original cache file to new mapped dylib file
- const uint64_t newSymTabOffset = (newDataInCodeOffset + dataInCodeSize + sizeof(pint_t) - 1) & (-sizeof(pint_t)); // pointer align
- const uint64_t newIndSymTabOffset = newSymTabOffset + newSymCount*sizeof(macho_nlist<P>);
- const uint64_t newStringPoolOffset = newIndSymTabOffset + dynamicSymTab->nindirectsyms()*sizeof(uint32_t);
- macho_nlist<P>* const newSymTabStart = (macho_nlist<P>*)(((uint8_t*)mh) + newSymTabOffset);
- char* const newStringPoolStart = (char*)mh + newStringPoolOffset;
- const uint32_t* mergedIndSymTab = (uint32_t*)((char*)mapped_cache + dynamicSymTab->indirectsymoff());
- const char* mergedStringPoolStart = (char*)mapped_cache + symtab->stroff();
- const char* mergedStringPoolEnd = &mergedStringPoolStart[symtab->strsize()];
- macho_nlist<P>* t = newSymTabStart;
- int poolOffset = 0;
- uint32_t symbolsCopied = 0;
- newStringPoolStart[poolOffset++] = '\0'; // first pool entry is always empty string
- for (const macho_nlist<P>* s = mergedSymTabStart; s != mergedSymTabend; ++s) {
- // if we have better local symbol info, skip any locals here
- if ( (localNlists != NULL) && ((s->n_type() & (N_TYPE|N_EXT)) == N_SECT) )
- continue;
- *t = *s;
- t->set_n_strx(poolOffset);
- const char* symName = &mergedStringPoolStart[s->n_strx()];
- if ( symName > mergedStringPoolEnd )
- symName = "<corrupt symbol name>";
- strcpy(&newStringPoolStart[poolOffset], symName);
- poolOffset += (strlen(symName) + 1);
- ++t;
- ++symbolsCopied;
- }
- // <rdar://problem/16529213> recreate N_INDR symbols in extracted dylibs for debugger
- for (std::vector<mach_o::trie::Entry>::iterator it = exports.begin(); it != exports.end(); ++it) {
- strcpy(&newStringPoolStart[poolOffset], it->name);
- t->set_n_strx(poolOffset);
- poolOffset += (strlen(it->name) + 1);
- t->set_n_type(N_INDR | N_EXT);
- t->set_n_sect(0);
- t->set_n_desc(0);
- const char* importName = it->importName;
- if ( *importName == '\0' )
- importName = it->name;
- strcpy(&newStringPoolStart[poolOffset], importName);
- t->set_n_value(poolOffset);
- poolOffset += (strlen(importName) + 1);
- ++t;
- ++symbolsCopied;
- }
- if ( localNlists != NULL ) {
- // update load command to reflect new count of locals
- dynamicSymTab->set_ilocalsym(symbolsCopied);
- dynamicSymTab->set_nlocalsym(localNlistCount);
- // copy local symbols
- for (uint32_t i=0; i < localNlistCount; ++i) {
- const char* localName = &localStrings[localNlists[i].n_strx()];
- if ( localName > localStringsEnd )
- localName = "<corrupt local symbol name>";
- *t = localNlists[i];
- t->set_n_strx(poolOffset);
- strcpy(&newStringPoolStart[poolOffset], localName);
- poolOffset += (strlen(localName) + 1);
- ++t;
- ++symbolsCopied;
- }
- }
-
- if ( newSymCount != symbolsCopied ) {
- fprintf(stderr, "symbol count miscalculation\n");
- return -1;
- }
-
- // pointer align string pool size
- while ( (poolOffset % sizeof(pint_t)) != 0 )
- ++poolOffset;
- // copy indirect symbol table
- uint32_t* newIndSymTab = (uint32_t*)((char*)mh + newIndSymTabOffset);
- memcpy(newIndSymTab, mergedIndSymTab, dynamicSymTab->nindirectsyms()*sizeof(uint32_t));
-
- // update load commands
- if ( functionStarts != NULL ) {
- functionStarts->set_dataoff((uint32_t)newFunctionStartsOffset);
- functionStarts->set_datasize(functionStartsSize);
- }
- if ( dataInCode != NULL ) {
- dataInCode->set_dataoff((uint32_t)newDataInCodeOffset);
- dataInCode->set_datasize(dataInCodeSize);
- }
- symtab->set_nsyms(symbolsCopied);
- symtab->set_symoff((uint32_t)newSymTabOffset);
- symtab->set_stroff((uint32_t)newStringPoolOffset);
- symtab->set_strsize(poolOffset);
- dynamicSymTab->set_extreloff(0);
- dynamicSymTab->set_nextrel(0);
- dynamicSymTab->set_locreloff(0);
- dynamicSymTab->set_nlocrel(0);
- dynamicSymTab->set_indirectsymoff((uint32_t)newIndSymTabOffset);
- linkEditSegCmd->set_filesize(symtab->stroff()+symtab->strsize() - linkEditSegCmd->fileoff());
- linkEditSegCmd->set_vmsize( (linkEditSegCmd->filesize()+4095) & (-4096) );
-
- // return new size
- *newSize = (symtab->stroff()+symtab->strsize()+4095) & (-4096);
-
- // <rdar://problem/17671438> Xcode 6 leaks in dyld_shared_cache_extract_dylibs
- for (std::vector<mach_o::trie::Entry>::iterator it = exports.begin(); it != exports.end(); ++it) {
- ::free((void*)(it->name));
- }
-
-
- return 0;
-}
-
-
-
-static void make_dirs(const char* file_path)
-{
- //printf("make_dirs(%s)\n", file_path);
- char dirs[strlen(file_path)+1];
- strcpy(dirs, file_path);
- char* lastSlash = strrchr(dirs, '/');
- if ( lastSlash == NULL )
- return;
- lastSlash[1] = '\0';
- struct stat stat_buf;
- if ( stat(dirs, &stat_buf) != 0 ) {
- char* afterSlash = &dirs[1];
- char* slash;
- while ( (slash = strchr(afterSlash, '/')) != NULL ) {
- *slash = '\0';
- ::mkdir(dirs, S_IRWXU | S_IRGRP|S_IXGRP | S_IROTH|S_IXOTH);
- //printf("mkdir(%s)\n", dirs);
- *slash = '/';
- afterSlash = slash+1;
- }
- }
-}
-
-
-
-template <typename A>
-size_t dylib_maker(const void* mapped_cache, std::vector<uint8_t> &dylib_data, const std::vector<seg_info>& segments) {
- typedef typename A::P P;
-
- size_t additionalSize = 0;
- for(std::vector<seg_info>::const_iterator it=segments.begin(); it != segments.end(); ++it) {
- additionalSize += it->sizem;
- }
-
- dylib_data.reserve(dylib_data.size() + additionalSize);
-
- uint32_t nfat_archs = 0;
- uint32_t offsetInFatFile = 4096;
- uint8_t *base_ptr = &dylib_data.front();
-
-#define FH reinterpret_cast<fat_header*>(base_ptr)
-#define FA reinterpret_cast<fat_arch*>(base_ptr + (8 + (nfat_archs - 1) * sizeof(fat_arch)))
-
- if(dylib_data.size() >= 4096 && OSSwapBigToHostInt32(FH->magic) == FAT_MAGIC) {
- // have fat header, append new arch to end
- nfat_archs = OSSwapBigToHostInt32(FH->nfat_arch);
- offsetInFatFile = OSSwapBigToHostInt32(FA->offset) + OSSwapBigToHostInt32(FA->size);
- }
-
- dylib_data.resize(offsetInFatFile);
- base_ptr = &dylib_data.front();
-
- FH->magic = OSSwapHostToBigInt32(FAT_MAGIC);
- FH->nfat_arch = OSSwapHostToBigInt32(++nfat_archs);
-
- FA->cputype = 0; // filled in later
- FA->cpusubtype = 0; // filled in later
- FA->offset = OSSwapHostToBigInt32(offsetInFatFile);
- FA->size = 0; // filled in later
- FA->align = OSSwapHostToBigInt32(12);
-
- // Write regular segments into the buffer
- uint64_t totalSize = 0;
- uint64_t textOffsetInCache = 0;
- for( std::vector<seg_info>::const_iterator it=segments.begin(); it != segments.end(); ++it) {
-
- if(strcmp(it->segName, "__TEXT") == 0 ) {
- textOffsetInCache = it->offset;
- const macho_header<P> *textMH = reinterpret_cast<macho_header<P>*>((uint8_t*)mapped_cache+textOffsetInCache);
- FA->cputype = OSSwapHostToBigInt32(textMH->cputype());
- FA->cpusubtype = OSSwapHostToBigInt32(textMH->cpusubtype());
-
- // if this cputype/subtype already exist in fat header, then return immediately
- for(uint32_t i=0; i < nfat_archs-1; ++i) {
- fat_arch *afa = reinterpret_cast<fat_arch*>(base_ptr+8)+i;
-
- if( afa->cputype == FA->cputype
- && afa->cpusubtype == FA->cpusubtype) {
- //fprintf(stderr, "arch already exists in fat dylib\n");
- dylib_data.resize(offsetInFatFile);
- return offsetInFatFile;
- }
- }
- }
-
- //printf("segName=%s, offset=0x%llX, size=0x%0llX\n", it->segName, it->offset, it->sizem);
- std::copy(((uint8_t*)mapped_cache)+it->offset, ((uint8_t*)mapped_cache)+it->offset+it->sizem, std::back_inserter(dylib_data));
- base_ptr = &dylib_data.front();
- totalSize += it->sizem;
- }
-
- FA->size = OSSwapHostToBigInt32(totalSize);
-
- // optimize linkedit
- uint64_t newSize = dylib_data.size();
- optimize_linkedit<A>(((macho_header<P>*)(base_ptr+offsetInFatFile)), textOffsetInCache, mapped_cache, &newSize);
-
- // update fat header with new file size
- dylib_data.resize(offsetInFatFile+newSize);
- base_ptr = &dylib_data.front();
- FA->size = OSSwapHostToBigInt32(newSize);
-#undef FH
-#undef FA
- return offsetInFatFile;
-}
-
-
-int dyld_shared_cache_extract_dylibs_progress(const char* shared_cache_file_path, const char* extraction_root_path,
- void (^progress)(unsigned current, unsigned total))
-{
- struct stat statbuf;
- if (stat(shared_cache_file_path, &statbuf)) {
- fprintf(stderr, "Error: stat failed for dyld shared cache at %s\n", shared_cache_file_path);
- return -1;
- }
-
- int cache_fd = open(shared_cache_file_path, O_RDONLY);
- if (cache_fd < 0) {
- fprintf(stderr, "Error: failed to open shared cache file at %s\n", shared_cache_file_path);
- return -1;
- }
-
- void* mapped_cache = mmap(NULL, statbuf.st_size, PROT_READ, MAP_PRIVATE, cache_fd, 0);
- if (mapped_cache == MAP_FAILED) {
- fprintf(stderr, "Error: mmap() for shared cache at %s failed, errno=%d\n", shared_cache_file_path, errno);
- return -1;
- }
-
- close(cache_fd);
-
- // instantiate arch specific dylib maker
- size_t (*dylib_create_func)(const void*, std::vector<uint8_t>&, const std::vector<seg_info>&) = NULL;
- if ( strcmp((char*)mapped_cache, "dyld_v1 i386") == 0 )
- dylib_create_func = dylib_maker<x86>;
- else if ( strcmp((char*)mapped_cache, "dyld_v1 x86_64") == 0 )
- dylib_create_func = dylib_maker<x86_64>;
- else if ( strcmp((char*)mapped_cache, "dyld_v1 x86_64h") == 0 )
- dylib_create_func = dylib_maker<x86_64>;
- else if ( strcmp((char*)mapped_cache, "dyld_v1 armv5") == 0 )
- dylib_create_func = dylib_maker<arm>;
- else if ( strcmp((char*)mapped_cache, "dyld_v1 armv6") == 0 )
- dylib_create_func = dylib_maker<arm>;
- else if ( strcmp((char*)mapped_cache, "dyld_v1 armv7") == 0 )
- dylib_create_func = dylib_maker<arm>;
- else if ( strncmp((char*)mapped_cache, "dyld_v1 armv7", 14) == 0 )
- dylib_create_func = dylib_maker<arm>;
- else if ( strcmp((char*)mapped_cache, "dyld_v1 arm64") == 0 )
- dylib_create_func = dylib_maker<arm64>;
- else {
- fprintf(stderr, "Error: unrecognized dyld shared cache magic.\n");
- munmap(mapped_cache, statbuf.st_size);
- return -1;
- }
-
- // iterate through all images in cache and build map of dylibs and segments
- __block NameToSegments map;
- __block int result = dyld_shared_cache_iterate(mapped_cache, (uint32_t)statbuf.st_size, ^(const dyld_shared_cache_dylib_info* dylibInfo, const dyld_shared_cache_segment_info* segInfo) {
- map[dylibInfo->path].push_back(seg_info(segInfo->name, segInfo->fileOffset, segInfo->fileSize));
- });
-
- if(result != 0) {
- fprintf(stderr, "Error: dyld_shared_cache_iterate_segments_with_slide failed.\n");
- munmap(mapped_cache, statbuf.st_size);
- return result;
- }
-
- // for each dylib instantiate a dylib file
- dispatch_group_t group = dispatch_group_create();
- dispatch_semaphore_t sema = dispatch_semaphore_create(2);
- dispatch_queue_t process_queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0);
- dispatch_queue_t writer_queue = dispatch_queue_create("dyld writer queue", 0);
-
- __block unsigned count = 0;
-
- for ( NameToSegments::iterator it = map.begin(); it != map.end(); ++it) {
- dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
- dispatch_group_async(group, process_queue, ^{
-
- char dylib_path[PATH_MAX];
- strcpy(dylib_path, extraction_root_path);
- strcat(dylib_path, "/");
- strcat(dylib_path, it->first);
-
- //printf("%s with %lu segments\n", dylib_path, it->second.size());
- // make sure all directories in this path exist
- make_dirs(dylib_path);
-
- // open file, create if does not already exist
- int fd = ::open(dylib_path, O_CREAT | O_EXLOCK | O_RDWR, 0644);
- if ( fd == -1 ) {
- fprintf(stderr, "can't open or create dylib file %s, errnor=%d\n", dylib_path, errno);
- result = -1;
- return;
- }
-
- struct stat statbuf;
- if (fstat(fd, &statbuf)) {
- fprintf(stderr, "Error: stat failed for dyld file %s, errnor=%d\n", dylib_path, errno);
- close(fd);
- result = -1;
- return;
- }
-
- std::vector<uint8_t> *vec = new std::vector<uint8_t>(statbuf.st_size);
- if(pread(fd, &vec->front(), vec->size(), 0) != (long)vec->size()) {
- fprintf(stderr, "can't read dylib file %s, errnor=%d\n", dylib_path, errno);
- close(fd);
- result = -1;
- return;
- }
-
- const size_t offset = dylib_create_func(mapped_cache, *vec, it->second);
-
- dispatch_group_async(group, writer_queue, ^{
- progress(count++, (unsigned)map.size());
-
- if(offset != vec->size()) {
- //Write out the first page, and everything after offset
- if( pwrite(fd, &vec->front(), 4096, 0) == -1
- || pwrite(fd, &vec->front() + offset, vec->size() - offset, offset) == -1) {
- fprintf(stderr, "error writing, errnor=%d\n", errno);
- result = -1;
- }
- }
-
- delete vec;
- close(fd);
- dispatch_semaphore_signal(sema);
- });
- });
- }
-
- dispatch_group_wait(group, DISPATCH_TIME_FOREVER);
- dispatch_release(group);
- dispatch_release(writer_queue);
-
- munmap(mapped_cache, statbuf.st_size);
- return result;
-}
-
-
-
-int dyld_shared_cache_extract_dylibs(const char* shared_cache_file_path, const char* extraction_root_path)
-{
- return dyld_shared_cache_extract_dylibs_progress(shared_cache_file_path, extraction_root_path,
- ^(unsigned , unsigned) {} );
-}
-
-
-#if 0
-// test program
-#include <stdio.h>
-#include <stddef.h>
-#include <dlfcn.h>
-
-
-typedef int (*extractor_proc)(const char* shared_cache_file_path, const char* extraction_root_path,
- void (^progress)(unsigned current, unsigned total));
-
-int main(int argc, const char* argv[])
-{
- if ( argc != 3 ) {
- fprintf(stderr, "usage: dsc_extractor <path-to-cache-file> <path-to-device-dir>\n");
- return 1;
- }
-
- //void* handle = dlopen("/Volumes/my/src/dyld/build/Debug/dsc_extractor.bundle", RTLD_LAZY);
- void* handle = dlopen("/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/usr/lib/dsc_extractor.bundle", RTLD_LAZY);
- if ( handle == NULL ) {
- fprintf(stderr, "dsc_extractor.bundle could not be loaded\n");
- return 1;
- }
-
- extractor_proc proc = (extractor_proc)dlsym(handle, "dyld_shared_cache_extract_dylibs_progress");
- if ( proc == NULL ) {
- fprintf(stderr, "dsc_extractor.bundle did not have dyld_shared_cache_extract_dylibs_progress symbol\n");
- return 1;
- }
-
- int result = (*proc)(argv[1], argv[2], ^(unsigned c, unsigned total) { printf("%d/%d\n", c, total); } );
- fprintf(stderr, "dyld_shared_cache_extract_dylibs_progress() => %d\n", result);
- return 0;
-}
-
-
-#endif
-
-
-
-