pmt: first codes.

srclib/libhelper/src/Sha256.cpp

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+/*
+   Copyright 2025 Yağız Zengin
+
+   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 <fstream>
+#include <vector>
+#include <string>
+#include <iostream>
+#include <optional>
+#include <picosha2.h>
+#include <sys/stat.h>
+#include <libhelper/lib.hpp>
+
+namespace Helper {
+
+std::optional<std::string_view> sha256Of(const std::string_view path)
+{
+	if (!fileIsExists(path)) {
+		throw Error("Is not exists or not file: %s", path.data());
+		return std::nullopt;
+	}
+
+	std::ifstream file(path, std::ios::binary);
+	if (!file) {
+		throw Error("Cannot open file: %s", path.data());
+		return std::nullopt;
+	}
+
+	std::vector<unsigned char> hash(picosha2::k_digest_size);
+	picosha2::hash256(path, hash.begin(), hash.end());
+	return picosha2::bytes_to_hex_string(hash.begin(), hash.end());
+}
+
+bool sha256Compare(const std::string_view file1, const std::string_view file2)
+{
+	auto f1 = sha256Of(file1);
+	auto f2 = sha256Of(file2);
+	if (f1->empty() || f2->empty()) return false;
+	return (*f1 == *f2);
+}
+
+} // namespace Helper