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https://github.com/clementine-player/Clementine
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111 lines
4.5 KiB
C++
111 lines
4.5 KiB
C++
// Copyright (c) 2006, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// macho_walker.h: Iterate over the load commands in a mach-o file
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//
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// Author: Dan Waylonis
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#ifndef COMMON_MAC_MACHO_WALKER_H__
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#define COMMON_MAC_MACHO_WALKER_H__
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#include <mach-o/loader.h>
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#include <sys/types.h>
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namespace MacFileUtilities {
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class MachoWalker {
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public:
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// A callback function executed when a new load command is read. If no
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// further processing of load commands is desired, return false. Otherwise,
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// return true.
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// |cmd| is the current command, and |offset| is the location relative to the
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// beginning of the file (not header) where the command was read. If |swap|
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// is set, then any command data (other than the returned load_command) should
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// be swapped when read
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typedef bool (*LoadCommandCallback)(MachoWalker *walker, load_command *cmd,
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off_t offset, bool swap, void *context);
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MachoWalker(const char *path, LoadCommandCallback callback, void *context);
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MachoWalker(int file_descriptor, LoadCommandCallback callback, void *context);
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~MachoWalker();
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// Begin walking the header for |cpu_type|. If |cpu_type| is 0, then the
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// native cpu type is used. Otherwise, accepted values are listed in
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// /usr/include/mach/machine.h (e.g., CPU_TYPE_X86 or CPU_TYPE_POWERPC).
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// Returns false if opening the file failed or if the |cpu_type| is not
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// present in the file.
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bool WalkHeader(int cpu_type);
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// Locate (if any) the header offset for |cpu_type| and return in |offset|.
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// Return true if found, false otherwise.
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bool FindHeader(int cpu_type, off_t &offset);
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// Read |size| bytes from the opened file at |offset| into |buffer|
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bool ReadBytes(void *buffer, size_t size, off_t offset);
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// Return the current header and header offset
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bool CurrentHeader(struct mach_header_64 *header, off_t *offset);
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private:
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// Validate the |cpu_type|
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int ValidateCPUType(int cpu_type);
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// Process an individual header starting at |offset| from the start of the
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// file. Return true if successful, false otherwise.
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bool WalkHeaderAtOffset(off_t offset);
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bool WalkHeader64AtOffset(off_t offset);
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// Bottleneck for walking the load commands
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bool WalkHeaderCore(off_t offset, uint32_t number_of_commands, bool swap);
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// File descriptor to the opened file
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int file_;
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// User specified callback & context
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LoadCommandCallback callback_;
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void *callback_context_;
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// Current header, size, and offset. The mach_header_64 is used for both
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// 32-bit and 64-bit headers because they only differ in their last field
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// (reserved). By adding the |current_header_size_| and the
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// |current_header_offset_|, you can determine the offset in the file just
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// after the header.
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struct mach_header_64 *current_header_;
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unsigned long current_header_size_;
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off_t current_header_offset_;
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private:
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MachoWalker(const MachoWalker &);
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MachoWalker &operator=(const MachoWalker &);
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};
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} // namespace MacFileUtilities
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#endif // COMMON_MAC_MACHO_WALKER_H__
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