mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-12-01 01:36:09 +03:00
131 lines
3.5 KiB
C++
131 lines
3.5 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
#include "base/files/memory_mapped_file.h"
|
|
|
|
#include <utility>
|
|
|
|
#include "base/files/file_path.h"
|
|
#include "base/logging.h"
|
|
#include "base/numerics/safe_math.h"
|
|
#include "base/sys_info.h"
|
|
#include "build/build_config.h"
|
|
|
|
namespace base {
|
|
|
|
const MemoryMappedFile::Region MemoryMappedFile::Region::kWholeFile = {0, 0};
|
|
|
|
bool MemoryMappedFile::Region::operator==(
|
|
const MemoryMappedFile::Region& other) const {
|
|
return other.offset == offset && other.size == size;
|
|
}
|
|
|
|
bool MemoryMappedFile::Region::operator!=(
|
|
const MemoryMappedFile::Region& other) const {
|
|
return other.offset != offset || other.size != size;
|
|
}
|
|
|
|
MemoryMappedFile::~MemoryMappedFile() {
|
|
CloseHandles();
|
|
}
|
|
|
|
#if !defined(OS_NACL)
|
|
bool MemoryMappedFile::Initialize(const FilePath& file_name, Access access) {
|
|
if (IsValid())
|
|
return false;
|
|
|
|
uint32_t flags = 0;
|
|
switch (access) {
|
|
case READ_ONLY:
|
|
flags = File::FLAG_OPEN | File::FLAG_READ;
|
|
break;
|
|
case READ_WRITE:
|
|
flags = File::FLAG_OPEN | File::FLAG_READ | File::FLAG_WRITE;
|
|
break;
|
|
case READ_WRITE_EXTEND:
|
|
// Can't open with "extend" because no maximum size is known.
|
|
NOTREACHED();
|
|
}
|
|
file_.Initialize(file_name, flags);
|
|
|
|
if (!file_.IsValid()) {
|
|
DLOG(ERROR) << "Couldn't open " << file_name.AsUTF8Unsafe();
|
|
return false;
|
|
}
|
|
|
|
if (!MapFileRegionToMemory(Region::kWholeFile, access)) {
|
|
CloseHandles();
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool MemoryMappedFile::Initialize(File file, Access access) {
|
|
DCHECK_NE(READ_WRITE_EXTEND, access);
|
|
return Initialize(std::move(file), Region::kWholeFile, access);
|
|
}
|
|
|
|
bool MemoryMappedFile::Initialize(File file,
|
|
const Region& region,
|
|
Access access) {
|
|
switch (access) {
|
|
case READ_WRITE_EXTEND:
|
|
DCHECK(Region::kWholeFile != region);
|
|
{
|
|
CheckedNumeric<int64_t> region_end(region.offset);
|
|
region_end += region.size;
|
|
if (!region_end.IsValid()) {
|
|
DLOG(ERROR) << "Region bounds exceed maximum for base::File.";
|
|
return false;
|
|
}
|
|
}
|
|
// Fall through.
|
|
case READ_ONLY:
|
|
case READ_WRITE:
|
|
// Ensure that the region values are valid.
|
|
if (region.offset < 0) {
|
|
DLOG(ERROR) << "Region bounds are not valid.";
|
|
return false;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (IsValid())
|
|
return false;
|
|
|
|
if (region != Region::kWholeFile)
|
|
DCHECK_GE(region.offset, 0);
|
|
|
|
file_ = std::move(file);
|
|
|
|
if (!MapFileRegionToMemory(region, access)) {
|
|
CloseHandles();
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool MemoryMappedFile::IsValid() const {
|
|
return data_ != nullptr;
|
|
}
|
|
|
|
// static
|
|
void MemoryMappedFile::CalculateVMAlignedBoundaries(int64_t start,
|
|
size_t size,
|
|
int64_t* aligned_start,
|
|
size_t* aligned_size,
|
|
int32_t* offset) {
|
|
// Sadly, on Windows, the mmap alignment is not just equal to the page size.
|
|
auto mask = SysInfo::VMAllocationGranularity() - 1;
|
|
DCHECK(IsValueInRangeForNumericType<int32_t>(mask));
|
|
*offset = start & mask;
|
|
*aligned_start = start & ~mask;
|
|
*aligned_size = (size + *offset + mask) & ~mask;
|
|
}
|
|
#endif // !defined(OS_NACL)
|
|
|
|
} // namespace base
|