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author | Tianjie Xu <xunchang@google.com> | 2019-03-19 21:34:58 +0100 |
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committer | Gerrit Code Review <noreply-gerritcodereview@google.com> | 2019-03-19 21:34:58 +0100 |
commit | eeea86f5fdf29c7e8742fd0fe062ad09e3130433 (patch) | |
tree | 874f99533dc317f106ba4da4e955713c5ff46051 /fuse_sideload/include/fuse_provider.h | |
parent | Merge "Skip calling verify_package_compatibility when resuming." (diff) | |
parent | Create a FuseDataProvider base class (diff) | |
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Diffstat (limited to 'fuse_sideload/include/fuse_provider.h')
-rw-r--r-- | fuse_sideload/include/fuse_provider.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/fuse_sideload/include/fuse_provider.h b/fuse_sideload/include/fuse_provider.h new file mode 100644 index 000000000..672af0577 --- /dev/null +++ b/fuse_sideload/include/fuse_provider.h @@ -0,0 +1,73 @@ +/* + * Copyright (C) 2019 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#pragma once + +#include <stdint.h> + +#include <string> + +#include <android-base/unique_fd.h> + +// This is the base class to read data from source and provide the data to FUSE. +class FuseDataProvider { + public: + FuseDataProvider(android::base::unique_fd&& fd, uint64_t file_size, uint32_t block_size) + : fd_(std::move(fd)), file_size_(file_size), fuse_block_size_(block_size) {} + + virtual ~FuseDataProvider() = default; + + uint64_t file_size() const { + return file_size_; + } + uint32_t fuse_block_size() const { + return fuse_block_size_; + } + + explicit operator bool() const { + return fd_ != -1; + } + + // Reads |fetch_size| bytes data starting from |start_block|. Puts the result in |buffer|. + virtual bool ReadBlockAlignedData(uint8_t* buffer, uint32_t fetch_size, + uint32_t start_block) const = 0; + + virtual void Close() = 0; + + protected: + FuseDataProvider() = default; + + // The underlying source to read data from. + android::base::unique_fd fd_; + // Size in bytes of the file to read. + uint64_t file_size_ = 0; + // Block size passed to the fuse, this is different from the block size of the block device. + uint32_t fuse_block_size_ = 0; +}; + +// This class reads data from a file. +class FuseFileDataProvider : public FuseDataProvider { + public: + FuseFileDataProvider(android::base::unique_fd&& fd, uint64_t file_size, uint32_t block_size) + : FuseDataProvider(std::move(fd), file_size, block_size) {} + + FuseFileDataProvider(const std::string& path, uint32_t block_size); + + bool ReadBlockAlignedData(uint8_t* buffer, uint32_t fetch_size, + uint32_t start_block) const override; + + void Close() override; +}; |