130 lines
3.8 KiB
C++
130 lines
3.8 KiB
C++
//
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// Copyright (C) 2017 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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#ifndef UPDATE_ENGINE_PAYLOAD_CONSUMER_FAKE_FILE_DESCRIPTOR_H_
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#define UPDATE_ENGINE_PAYLOAD_CONSUMER_FAKE_FILE_DESCRIPTOR_H_
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#include <algorithm>
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#include <limits>
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#include <utility>
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#include <vector>
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#include <brillo/secure_blob.h>
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#include "update_engine/payload_consumer/file_descriptor.h"
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namespace chromeos_update_engine {
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// A fake file descriptor with configurable errors. The file descriptor always
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// reads a fixed sequence of bytes, consisting of the concatenation of the
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// numbers 0, 1, 2... each one encoded in 4 bytes as the big-endian 16-bit
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// number encoded in hexadecimal. For example, the beginning of the stream in
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// ASCII is 0000000100020003... which corresponds to the numbers 0, 1, 2 and 3.
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class FakeFileDescriptor : public FileDescriptor {
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public:
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FakeFileDescriptor() = default;
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~FakeFileDescriptor() override = default;
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// FileDescriptor override methods.
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bool Open(const char* path, int flags, mode_t mode) override {
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if (open_)
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return false;
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open_ = true;
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return true;
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}
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bool Open(const char* path, int flags) override {
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return Open(path, flags, 0);
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}
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ssize_t Read(void* buf, size_t count) override;
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ssize_t Write(const void* buf, size_t count) override {
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// Read-only block device.
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errno = EROFS;
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return -1;
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}
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off64_t Seek(off64_t offset, int whence) override;
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uint64_t BlockDevSize() override { return size_; }
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bool BlkIoctl(int request,
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uint64_t start,
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uint64_t length,
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int* result) override {
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return false;
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}
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bool Flush() override { return open_; }
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bool Close() override {
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if (!open_)
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return false;
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open_ = false;
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return true;
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}
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bool IsSettingErrno() override { return true; }
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bool IsOpen() override { return open_; }
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// Fake class configuration methods.
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// Set the size of the file.
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void SetFileSize(uint64_t size) { size_ = size; }
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// Marks the range starting from |offset| bytes into the file and |length|
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// size as a failure range. Reads from this range will always fail.
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void AddFailureRange(uint64_t offset, uint64_t length) {
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if (length == 0)
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return;
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failure_ranges_.emplace_back(offset, length);
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}
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// Return the list of ranges of bytes requested with a Read() as (offset,
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// length), regardless of the Read() return value.
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std::vector<std::pair<uint64_t, uint64_t>> GetReadOps() const {
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return read_ops_;
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}
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private:
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// Whether the fake file is open.
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bool open_{false};
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// The current file pointer offset into the fake file.
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uint64_t offset_{0};
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// The size of the file. Reads beyond |max_size_| will an EOF condition.
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off64_t size_{std::numeric_limits<off64_t>::max()};
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// The list of ranges represented as (start, length) in bytes where reads will
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// always fail.
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std::vector<std::pair<uint64_t, uint64_t>> failure_ranges_;
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// List of reads performed as (offset, length) of the read request.
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std::vector<std::pair<uint64_t, uint64_t>> read_ops_;
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DISALLOW_COPY_AND_ASSIGN(FakeFileDescriptor);
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};
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// Return a blob with the first |size| bytes of a FakeFileDescriptor stream.
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brillo::Blob FakeFileDescriptorData(size_t size);
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} // namespace chromeos_update_engine
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#endif // UPDATE_ENGINE_PAYLOAD_CONSUMER_FAKE_FILE_DESCRIPTOR_H_
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