mirror of https://github.com/NekoX-Dev/NekoX.git
119 lines
3.6 KiB
C++
119 lines
3.6 KiB
C++
// Copyright (c) 2011, 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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// memory_mapped_file.cc: Implement google_breakpad::MemoryMappedFile.
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// See memory_mapped_file.h for details.
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#include "common/linux/memory_mapped_file.h"
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#include <fcntl.h>
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#include <sys/mman.h>
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#if defined(__ANDROID__)
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#include <sys/stat.h>
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#endif
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#include <unistd.h>
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#include "common/memory_range.h"
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#include "third_party/lss/linux_syscall_support.h"
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namespace google_breakpad {
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MemoryMappedFile::MemoryMappedFile() {}
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MemoryMappedFile::MemoryMappedFile(const char* path, size_t offset) {
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Map(path, offset);
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}
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MemoryMappedFile::~MemoryMappedFile() {
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Unmap();
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}
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#include <unistd.h>
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bool MemoryMappedFile::Map(const char* path, size_t offset) {
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Unmap();
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int fd = sys_open(path, O_RDONLY, 0);
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if (fd == -1) {
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return false;
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}
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#if defined(__x86_64__) || defined(__aarch64__) || \
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(defined(__mips__) && _MIPS_SIM == _ABI64)
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struct kernel_stat st;
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if (sys_fstat(fd, &st) == -1 || st.st_size < 0) {
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#else
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struct kernel_stat64 st;
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if (sys_fstat64(fd, &st) == -1 || st.st_size < 0) {
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#endif
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sys_close(fd);
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return false;
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}
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// Strangely file size can be negative, but we check above that it is not.
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size_t file_len = static_cast<size_t>(st.st_size);
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// If the file does not extend beyond the offset, simply use an empty
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// MemoryRange and return true. Don't bother to call mmap()
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// even though mmap() can handle an empty file on some platforms.
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if (offset >= file_len) {
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sys_close(fd);
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return true;
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}
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#if defined(__x86_64__) || defined(__aarch64__) || \
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(defined(__mips__) && _MIPS_SIM == _ABI64)
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void* data = sys_mmap(NULL, file_len, PROT_READ, MAP_PRIVATE, fd, offset);
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#else
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if ((offset & 4095) != 0) {
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// Not page aligned.
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sys_close(fd);
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return false;
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}
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void* data = sys_mmap2(
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NULL, file_len, PROT_READ, MAP_PRIVATE, fd, offset >> 12);
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#endif
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sys_close(fd);
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if (data == MAP_FAILED) {
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return false;
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}
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content_.Set(data, file_len - offset);
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return true;
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}
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void MemoryMappedFile::Unmap() {
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if (content_.data()) {
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sys_munmap(const_cast<uint8_t*>(content_.data()), content_.length());
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content_.Set(NULL, 0);
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}
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}
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} // namespace google_breakpad
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