dyld3/shared-cache/FileUtils.h

   1 /*
   2  * Copyright (c) 2017 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24
  25 #ifndef FileUtils_h
  26 #define FileUtils_h
  27
  28 #include <stdint.h>
  29
  30 #include <map>
  31 #include <set>
  32 #include <string>
  33 #include <vector>
  34 #include <unordered_map>
  35 #include <unordered_set>
  36 #include <dispatch/dispatch.h>
  37
  38 #include "DyldSharedCache.h"
  39 #include "JSON.h"
  40
  41 class Diagnostics;
  42
  43 #if BUILDING_CACHE_BUILDER
  44 struct FileCache {
  45     FileCache(void);
  46     std::pair<uint8_t*, struct stat> cacheLoad(Diagnostics& diags, const std::string path);
  47
  48 private:
  49     std::pair<uint8_t*, struct stat> fill(Diagnostics& diags, const std::string& path);
  50
  51     std::unordered_map<std::string, std::pair<uint8_t*, struct stat>> entries;
  52     dispatch_queue_t cache_queue;
  53 };
  54
  55 extern FileCache fileCache;
  56 #endif
  57
  58 //
  59 // recursively walk all files in a directory tree
  60 // symlinks are ignored
  61 // dirFilter should return true on directories which should not be recursed into
  62 // callback is called on each regular file found with stat() info about the file
  63 //
  64 void iterateDirectoryTree(const std::string& pathPrefix, const std::string& path, bool (^dirFilter)(const std::string& dirPath),
  65                           void (^callback)(const std::string& path, const struct stat& statBuf), bool processFiles=true, bool recurse=true);
  66
  67
  68 //
  69 // writes the buffer to a temp file, then renames the file to the final path
  70 // returns true on success
  71 //
  72 bool safeSave(const void* buffer, size_t bufferLen, const std::string& path);
  73
  74
  75 const void* mapFileReadOnly(const char* path, size_t& mappedSize);
  76
  77 bool fileExists(const std::string& path);
  78
  79 std::unordered_map<std::string, uint32_t> parseOrderFile(const std::string& orderFileData);
  80 std::string loadOrderFile(const std::string& orderFilePath);
  81
  82 std::string normalize_absolute_file_path(std::string path);
  83 std::string basePath(const std::string& path);
  84 std::string dirPath(const std::string& path);
  85 std::string realPath(const std::string& path);
  86 std::string realFilePath(const std::string& path);
  87
  88 std::string toolDir();
  89
  90 #if BUILDING_CACHE_BUILDER
  91 class SymlinkResolver {
  92 public:
  93     SymlinkResolver() { }
  94
  95     void addFile(Diagnostics& diags, std::string path);
  96
  97     void addSymlink(Diagnostics& diags, std::string fromPath, std::string toPath);
  98
  99     std::string realPath(Diagnostics& diags, const std::string& path) const;
 100
 101     std::vector<DyldSharedCache::FileAlias> getResolvedSymlinks(Diagnostics& diags);
 102
 103 private:
 104     std::set<std::string> filePaths;
 105     std::map<std::string, std::string> symlinks;
 106 };
 107 #endif  // BUILDING_CACHE_BUILDER
 108
 109
 110 #endif // FileUtils_h