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94 lines
2.5 KiB
94 lines
2.5 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <sys/types.h>
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#include <memory>
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#include "android-base/macros.h"
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#include "android-base/off64_t.h"
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#include "android-base/unique_fd.h"
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#if defined(_WIN32)
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#include <windows.h>
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#define PROT_READ 1
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#define PROT_WRITE 2
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using os_handle = HANDLE;
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#else
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#include <sys/mman.h>
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using os_handle = int;
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#endif
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namespace android {
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namespace base {
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/**
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* A region of a file mapped into memory (for grepping: also known as MmapFile or file mapping).
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*/
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class MappedFile {
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public:
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/**
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* Creates a new mapping of the file pointed to by `fd`. Unlike the underlying OS primitives,
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* `offset` does not need to be page-aligned. If `PROT_WRITE` is set in `prot`, the mapping
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* will be writable, otherwise it will be read-only. Mappings are always `MAP_SHARED`.
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*/
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static std::unique_ptr<MappedFile> FromFd(borrowed_fd fd, off64_t offset, size_t length,
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int prot);
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/**
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* Same thing, but using the raw OS file handle instead of a CRT wrapper.
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*/
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static std::unique_ptr<MappedFile> FromOsHandle(os_handle h, off64_t offset, size_t length,
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int prot);
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/**
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* Removes the mapping.
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*/
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~MappedFile();
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/**
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* Not copyable but movable.
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*/
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MappedFile(MappedFile&& other);
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MappedFile& operator=(MappedFile&& other);
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char* data() const { return base_ + offset_; }
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size_t size() const { return size_; }
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(MappedFile);
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void Close();
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char* base_;
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size_t size_;
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size_t offset_;
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#if defined(_WIN32)
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MappedFile(char* base, size_t size, size_t offset, HANDLE handle)
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: base_(base), size_(size), offset_(offset), handle_(handle) {}
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HANDLE handle_;
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#else
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MappedFile(char* base, size_t size, size_t offset) : base_(base), size_(size), offset_(offset) {}
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#endif
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};
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} // namespace base
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} // namespace android
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