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// Copyright 2023 Huawei Cloud Computing Technology Co., Ltd.
//
// 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.
#include "src/buildtool/crypto/hash_function.hpp"
#include <cstddef>
#include <exception>
#include <fstream>
#include <limits>
#include "src/buildtool/logging/log_level.hpp"
#include "src/buildtool/logging/logger.hpp"
namespace {
[[nodiscard]] auto CreateGitTreeTag(std::size_t size) noexcept -> std::string {
return std::string("tree ") + std::to_string(size) + '\0';
}
[[nodiscard]] auto CreateGitBlobTag(std::size_t size) noexcept -> std::string {
return std::string("blob ") + std::to_string(size) + '\0';
}
} // namespace
auto HashFunction::HashBlobData(std::string const& data) const noexcept
-> Hasher::HashDigest {
return HashTaggedLine(data, CreateGitBlobTag);
}
auto HashFunction::HashTreeData(std::string const& data) const noexcept
-> Hasher::HashDigest {
return HashTaggedLine(data, CreateGitTreeTag);
}
auto HashFunction::PlainHashData(std::string const& data) const noexcept
-> Hasher::HashDigest {
return HashTaggedLine(data, std::nullopt);
}
auto HashFunction::HashTaggedLine(std::string const& data,
std::optional<TagCreator> tag_creator)
const noexcept -> Hasher::HashDigest {
auto hasher = MakeHasher();
if (type_ == Type::GitSHA1 and tag_creator.has_value()) {
hasher.Update(std::invoke(*tag_creator, data.size()));
}
hasher.Update(data);
return std::move(hasher).Finalize();
}
auto HashFunction::HashBlobFile(std::filesystem::path const& path) const
noexcept -> std::optional<std::pair<Hasher::HashDigest, std::uintmax_t>> {
return HashTaggedFile(path, CreateGitBlobTag);
}
auto HashFunction::HashTreeFile(std::filesystem::path const& path) const
noexcept -> std::optional<std::pair<Hasher::HashDigest, std::uintmax_t>> {
return HashTaggedFile(path, CreateGitTreeTag);
}
auto HashFunction::HashTaggedFile(std::filesystem::path const& path,
TagCreator const& tag_creator) const noexcept
-> std::optional<std::pair<Hasher::HashDigest, std::uintmax_t>> {
auto const size = std::filesystem::file_size(path);
static constexpr std::size_t kChunkSize{4048};
static_assert(kChunkSize < std::numeric_limits<std::streamsize>::max(),
"An overflow will occur while reading");
auto hasher = MakeHasher();
if (type_ == Type::GitSHA1) {
hasher.Update(std::invoke(tag_creator, size));
}
try {
auto chunk = std::string(kChunkSize, '\0');
std::ifstream file_reader(path.string(), std::ios::binary);
if (not file_reader.is_open()) {
return std::nullopt;
}
while (file_reader.good()) {
file_reader.read(chunk.data(),
static_cast<std::streamsize>(kChunkSize));
auto const count = static_cast<std::size_t>(file_reader.gcount());
hasher.Update(chunk.substr(0, count));
}
file_reader.close();
return std::make_pair(std::move(hasher).Finalize(), size);
} catch (std::exception const& e) {
Logger::Log(LogLevel::Debug,
"Error while trying to hash {}: {}",
path.string(),
e.what());
}
return std::nullopt;
}
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