63 lines
2 KiB
C++
63 lines
2 KiB
C++
// Copyright (c) 2021 Slack Technologies, Inc.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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#ifndef ELECTRON_SHELL_BROWSER_NET_ASAR_ASAR_FILE_VALIDATOR_H_
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#define ELECTRON_SHELL_BROWSER_NET_ASAR_ASAR_FILE_VALIDATOR_H_
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#include <algorithm>
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#include <memory>
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#include <optional>
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#include "crypto/secure_hash.h"
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#include "mojo/public/cpp/system/file_data_source.h"
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#include "mojo/public/cpp/system/filtered_data_source.h"
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#include "shell/common/asar/archive.h"
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namespace asar {
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class AsarFileValidator : public mojo::FilteredDataSource::Filter {
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public:
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AsarFileValidator(IntegrityPayload integrity, base::File file);
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~AsarFileValidator() override;
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// disable copy
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AsarFileValidator(const AsarFileValidator&) = delete;
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AsarFileValidator& operator=(const AsarFileValidator&) = delete;
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void OnRead(base::span<char> buffer,
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mojo::FileDataSource::ReadResult* result) override;
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void OnDone() override;
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void SetRange(uint64_t read_start, uint64_t extra_read, uint64_t read_max);
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void SetCurrentBlock(int current_block);
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protected:
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bool FinishBlock();
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private:
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base::File file_;
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IntegrityPayload integrity_;
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// The offset in the file_ that the underlying file reader is starting at
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uint64_t read_start_ = 0;
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// The number of bytes this DataSourceFilter will have seen that aren't used
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// by the DataProducer. These extra bytes are exclusively for hash validation
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// but we need to know how many we've used so we know when we're done.
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uint64_t extra_read_ = 0;
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// The maximum offset in the file_ that we should read to, used to determine
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// which bytes we're missing or if we need to read up to a block boundary in
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// OnDone
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uint64_t read_max_ = 0;
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bool done_reading_ = false;
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int current_block_;
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int max_block_;
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uint64_t current_hash_byte_count_ = 0;
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uint64_t total_hash_byte_count_ = 0;
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std::unique_ptr<crypto::SecureHash> current_hash_;
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};
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} // namespace asar
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#endif // ELECTRON_SHELL_BROWSER_NET_ASAR_ASAR_FILE_VALIDATOR_H_
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