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comparison: toolkit/crashreporter/google-breakpad/src/common/mac/macho_walker.h
toolkit/crashreporter/google-breakpad/src/common/mac/macho_walker.h
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| 1 // Copyright (c) 2006, Google Inc. | |
| 2 // All rights reserved. | |
| 3 // | |
| 4 // Redistribution and use in source and binary forms, with or without | |
| 5 // modification, are permitted provided that the following conditions are | |
| 6 // met: | |
| 7 // | |
| 8 // * Redistributions of source code must retain the above copyright | |
| 9 // notice, this list of conditions and the following disclaimer. | |
| 10 // * Redistributions in binary form must reproduce the above | |
| 11 // copyright notice, this list of conditions and the following disclaimer | |
| 12 // in the documentation and/or other materials provided with the | |
| 13 // distribution. | |
| 14 // * Neither the name of Google Inc. nor the names of its | |
| 15 // contributors may be used to endorse or promote products derived from | |
| 16 // this software without specific prior written permission. | |
| 17 // | |
| 18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 29 | |
| 30 // macho_walker.h: Iterate over the load commands in a mach-o file | |
| 31 // | |
| 32 // Author: Dan Waylonis | |
| 33 | |
| 34 #ifndef COMMON_MAC_MACHO_WALKER_H__ | |
| 35 #define COMMON_MAC_MACHO_WALKER_H__ | |
| 36 | |
| 37 #include <mach/machine.h> | |
| 38 #include <mach-o/loader.h> | |
| 39 #include <sys/types.h> | |
| 40 | |
| 41 namespace MacFileUtilities { | |
| 42 | |
| 43 class MachoWalker { | |
| 44 public: | |
| 45 // A callback function executed when a new load command is read. If no | |
| 46 // further processing of load commands is desired, return false. Otherwise, | |
| 47 // return true. | |
| 48 // |cmd| is the current command, and |offset| is the location relative to the | |
| 49 // beginning of the file (not header) where the command was read. If |swap| | |
| 50 // is set, then any command data (other than the returned load_command) should | |
| 51 // be swapped when read | |
| 52 typedef bool (*LoadCommandCallback)(MachoWalker *walker, load_command *cmd, | |
| 53 off_t offset, bool swap, void *context); | |
| 54 | |
| 55 MachoWalker(const char *path, LoadCommandCallback callback, void *context); | |
| 56 MachoWalker(void *memory, size_t size, LoadCommandCallback callback, | |
| 57 void *context); | |
| 58 ~MachoWalker(); | |
| 59 | |
| 60 // Begin walking the header for |cpu_type| and |cpu_subtype|. If |cpu_type| | |
| 61 // is 0, then the native cpu type is used. Otherwise, accepted values are | |
| 62 // listed in /usr/include/mach/machine.h (e.g., CPU_TYPE_X86 or | |
| 63 // CPU_TYPE_POWERPC). If |cpu_subtype| is CPU_SUBTYPE_MULTIPLE, the match is | |
| 64 // only done on |cpu_type|. | |
| 65 // Returns false if opening the file failed or if the |cpu_type|/|cpu_subtype| | |
| 66 // is not present in the file. | |
| 67 bool WalkHeader(cpu_type_t cpu_type, cpu_subtype_t cpu_subtype); | |
| 68 | |
| 69 // Read |size| bytes from the opened file at |offset| into |buffer| | |
| 70 bool ReadBytes(void *buffer, size_t size, off_t offset); | |
| 71 | |
| 72 // Return the current header and header offset | |
| 73 bool CurrentHeader(struct mach_header_64 *header, off_t *offset); | |
| 74 | |
| 75 private: | |
| 76 // Locate (if any) the header offset for |cpu_type| and return in |offset|. | |
| 77 // Return true if found, false otherwise. | |
| 78 bool FindHeader(cpu_type_t cpu_type, | |
| 79 cpu_subtype_t cpu_subtype, | |
| 80 off_t &offset); | |
| 81 | |
| 82 // Process an individual header starting at |offset| from the start of the | |
| 83 // file. Return true if successful, false otherwise. | |
| 84 bool WalkHeaderAtOffset(off_t offset); | |
| 85 bool WalkHeader64AtOffset(off_t offset); | |
| 86 | |
| 87 // Bottleneck for walking the load commands | |
| 88 bool WalkHeaderCore(off_t offset, uint32_t number_of_commands, bool swap); | |
| 89 | |
| 90 // File descriptor to the opened file | |
| 91 int file_; | |
| 92 | |
| 93 // Memory location to read from. | |
| 94 void *memory_; | |
| 95 | |
| 96 // Size of the memory segment we can read from. | |
| 97 size_t memory_size_; | |
| 98 | |
| 99 // User specified callback & context | |
| 100 LoadCommandCallback callback_; | |
| 101 void *callback_context_; | |
| 102 | |
| 103 // Current header, size, and offset. The mach_header_64 is used for both | |
| 104 // 32-bit and 64-bit headers because they only differ in their last field | |
| 105 // (reserved). By adding the |current_header_size_| and the | |
| 106 // |current_header_offset_|, you can determine the offset in the file just | |
| 107 // after the header. | |
| 108 struct mach_header_64 *current_header_; | |
| 109 unsigned long current_header_size_; | |
| 110 off_t current_header_offset_; | |
| 111 | |
| 112 private: | |
| 113 MachoWalker(const MachoWalker &); | |
| 114 MachoWalker &operator=(const MachoWalker &); | |
| 115 }; | |
| 116 | |
| 117 } // namespace MacFileUtilities | |
| 118 | |
| 119 #endif // COMMON_MAC_MACHO_WALKER_H__ |
