//
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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_CACHED_FILE_DESCRIPTOR_H_
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#define UPDATE_ENGINE_PAYLOAD_CONSUMER_CACHED_FILE_DESCRIPTOR_H_
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#include <errno.h>
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#include <sys/types.h>
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#include <memory>
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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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class CachedFileDescriptor : public FileDescriptor {
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public:
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CachedFileDescriptor(FileDescriptorPtr fd, size_t cache_size) : fd_(fd) {
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cache_.resize(cache_size);
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}
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~CachedFileDescriptor() override = default;
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bool Open(const char* path, int flags, mode_t mode) override {
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return fd_->Open(path, flags, mode);
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}
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bool Open(const char* path, int flags) override {
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return fd_->Open(path, flags);
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}
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ssize_t Read(void* buf, size_t count) override {
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return fd_->Read(buf, count);
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}
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ssize_t Write(const void* buf, size_t count) override;
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off64_t Seek(off64_t offset, int whence) override;
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uint64_t BlockDevSize() override { return fd_->BlockDevSize(); }
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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 fd_->BlkIoctl(request, start, length, result);
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}
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bool Flush() override;
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bool Close() override;
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bool IsSettingErrno() override { return fd_->IsSettingErrno(); }
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bool IsOpen() override { return fd_->IsOpen(); }
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private:
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// Internal flush without the need to call |fd_->Flush()|.
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bool FlushCache();
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FileDescriptorPtr fd_;
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brillo::Blob cache_;
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size_t bytes_cached_{0};
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off64_t offset_{0};
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DISALLOW_COPY_AND_ASSIGN(CachedFileDescriptor);
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};
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} // namespace chromeos_update_engine
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#endif // UPDATE_ENGINE_PAYLOAD_CONSUMER_CACHED_FILE_DESCRIPTOR_H_
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