mirror of
https://github.com/clementine-player/Clementine
synced 2024-12-16 19:31:02 +01:00
240 lines
7.0 KiB
C++
240 lines
7.0 KiB
C++
// Copyright (c) 2006, Google Inc.
|
|
// All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are
|
|
// met:
|
|
//
|
|
// * Redistributions of source code must retain the above copyright
|
|
// notice, this list of conditions and the following disclaimer.
|
|
// * Redistributions in binary form must reproduce the above
|
|
// copyright notice, this list of conditions and the following disclaimer
|
|
// in the documentation and/or other materials provided with the
|
|
// distribution.
|
|
// * Neither the name of Google Inc. nor the names of its
|
|
// contributors may be used to endorse or promote products derived from
|
|
// this software without specific prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
// macho_walker.cc: Iterate over the load commands in a mach-o file
|
|
//
|
|
// See macho_walker.h for documentation
|
|
//
|
|
// Author: Dan Waylonis
|
|
|
|
extern "C" { // necessary for Leopard
|
|
#include <assert.h>
|
|
#include <fcntl.h>
|
|
#include <mach-o/arch.h>
|
|
#include <mach-o/loader.h>
|
|
#include <mach-o/swap.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
}
|
|
|
|
#include "common/mac/byteswap.h"
|
|
#include "common/mac/macho_walker.h"
|
|
#include "common/mac/macho_utilities.h"
|
|
|
|
namespace MacFileUtilities {
|
|
|
|
MachoWalker::MachoWalker(const char *path, LoadCommandCallback callback,
|
|
void *context)
|
|
: file_(0),
|
|
callback_(callback),
|
|
callback_context_(context),
|
|
current_header_(NULL),
|
|
current_header_size_(0),
|
|
current_header_offset_(0) {
|
|
file_ = open(path, O_RDONLY);
|
|
}
|
|
|
|
MachoWalker::~MachoWalker() {
|
|
if (file_ != -1)
|
|
close(file_);
|
|
}
|
|
|
|
int MachoWalker::ValidateCPUType(int cpu_type) {
|
|
// If the user didn't specify, use the local architecture.
|
|
if (cpu_type == 0) {
|
|
const NXArchInfo *arch = NXGetLocalArchInfo();
|
|
assert(arch);
|
|
cpu_type = arch->cputype;
|
|
}
|
|
|
|
return cpu_type;
|
|
}
|
|
|
|
bool MachoWalker::WalkHeader(int cpu_type) {
|
|
int valid_cpu_type = ValidateCPUType(cpu_type);
|
|
off_t offset;
|
|
if (FindHeader(valid_cpu_type, offset)) {
|
|
if (cpu_type & CPU_ARCH_ABI64)
|
|
return WalkHeader64AtOffset(offset);
|
|
|
|
return WalkHeaderAtOffset(offset);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool MachoWalker::ReadBytes(void *buffer, size_t size, off_t offset) {
|
|
return pread(file_, buffer, size, offset) == (ssize_t)size;
|
|
}
|
|
|
|
bool MachoWalker::CurrentHeader(struct mach_header_64 *header, off_t *offset) {
|
|
if (current_header_) {
|
|
memcpy(header, current_header_, sizeof(mach_header_64));
|
|
*offset = current_header_offset_;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool MachoWalker::FindHeader(int cpu_type, off_t &offset) {
|
|
int valid_cpu_type = ValidateCPUType(cpu_type);
|
|
// Read the magic bytes that's common amongst all mach-o files
|
|
uint32_t magic;
|
|
if (!ReadBytes(&magic, sizeof(magic), 0))
|
|
return false;
|
|
|
|
offset = sizeof(magic);
|
|
|
|
// Figure out what type of file we've got
|
|
bool is_fat = false;
|
|
if (magic == FAT_MAGIC || magic == FAT_CIGAM) {
|
|
is_fat = true;
|
|
}
|
|
else if (magic != MH_MAGIC && magic != MH_CIGAM && magic != MH_MAGIC_64 &&
|
|
magic != MH_CIGAM_64) {
|
|
return false;
|
|
}
|
|
|
|
if (!is_fat) {
|
|
// If we don't have a fat header, check if the cpu type matches the single
|
|
// header
|
|
cpu_type_t header_cpu_type;
|
|
if (!ReadBytes(&header_cpu_type, sizeof(header_cpu_type), offset))
|
|
return false;
|
|
|
|
if (magic == MH_CIGAM || magic == MH_CIGAM_64)
|
|
header_cpu_type = ByteSwap(header_cpu_type);
|
|
|
|
if (valid_cpu_type != header_cpu_type)
|
|
return false;
|
|
|
|
offset = 0;
|
|
return true;
|
|
} else {
|
|
// Read the fat header and find an appropriate architecture
|
|
offset = 0;
|
|
struct fat_header fat;
|
|
if (!ReadBytes(&fat, sizeof(fat), offset))
|
|
return false;
|
|
|
|
if (NXHostByteOrder() != NX_BigEndian)
|
|
swap_fat_header(&fat, NXHostByteOrder());
|
|
|
|
offset += sizeof(fat);
|
|
|
|
// Search each architecture for the desired one
|
|
struct fat_arch arch;
|
|
for (uint32_t i = 0; i < fat.nfat_arch; ++i) {
|
|
if (!ReadBytes(&arch, sizeof(arch), offset))
|
|
return false;
|
|
|
|
if (NXHostByteOrder() != NX_BigEndian)
|
|
swap_fat_arch(&arch, 1, NXHostByteOrder());
|
|
|
|
if (arch.cputype == valid_cpu_type) {
|
|
offset = arch.offset;
|
|
return true;
|
|
}
|
|
|
|
offset += sizeof(arch);
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool MachoWalker::WalkHeaderAtOffset(off_t offset) {
|
|
struct mach_header header;
|
|
if (!ReadBytes(&header, sizeof(header), offset))
|
|
return false;
|
|
|
|
bool swap = (header.magic == MH_CIGAM);
|
|
if (swap)
|
|
swap_mach_header(&header, NXHostByteOrder());
|
|
|
|
// Copy the data into the mach_header_64 structure. Since the 32-bit and
|
|
// 64-bit only differ in the last field (reserved), this is safe to do.
|
|
struct mach_header_64 header64;
|
|
memcpy((void *)&header64, (const void *)&header, sizeof(header));
|
|
header64.reserved = 0;
|
|
|
|
current_header_ = &header64;
|
|
current_header_size_ = sizeof(header); // 32-bit, not 64-bit
|
|
current_header_offset_ = offset;
|
|
offset += current_header_size_;
|
|
bool result = WalkHeaderCore(offset, header.ncmds, swap);
|
|
current_header_ = NULL;
|
|
current_header_size_ = 0;
|
|
current_header_offset_ = 0;
|
|
return result;
|
|
}
|
|
|
|
bool MachoWalker::WalkHeader64AtOffset(off_t offset) {
|
|
struct mach_header_64 header;
|
|
if (!ReadBytes(&header, sizeof(header), offset))
|
|
return false;
|
|
|
|
bool swap = (header.magic == MH_CIGAM_64);
|
|
if (swap)
|
|
breakpad_swap_mach_header_64(&header, NXHostByteOrder());
|
|
|
|
current_header_ = &header;
|
|
current_header_size_ = sizeof(header);
|
|
current_header_offset_ = offset;
|
|
offset += current_header_size_;
|
|
bool result = WalkHeaderCore(offset, header.ncmds, swap);
|
|
current_header_ = NULL;
|
|
current_header_size_ = 0;
|
|
current_header_offset_ = 0;
|
|
return result;
|
|
}
|
|
|
|
bool MachoWalker::WalkHeaderCore(off_t offset, uint32_t number_of_commands,
|
|
bool swap) {
|
|
for (uint32_t i = 0; i < number_of_commands; ++i) {
|
|
struct load_command cmd;
|
|
if (!ReadBytes(&cmd, sizeof(cmd), offset))
|
|
return false;
|
|
|
|
if (swap)
|
|
swap_load_command(&cmd, NXHostByteOrder());
|
|
|
|
// Call the user callback
|
|
if (callback_ && !callback_(this, &cmd, offset, swap, callback_context_))
|
|
break;
|
|
|
|
offset += cmd.cmdsize;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
} // namespace MacFileUtilities
|