updater: Add windows updater module

UI/win-update/updater/hash.cpp

@@ -0,0 +1,61 @@
+#include "updater.hpp"
+
+#include <util/windows/WinHandle.hpp>
+#include <vector>
+
+using namespace std;
+
+void HashToString(const uint8_t *in, wchar_t *out)
+{
+	const wchar_t alphabet[] = L"0123456789abcdef";
+
+	for (int i = 0; i != BLAKE2_HASH_LENGTH; ++i) {
+		out[2 * i]     = alphabet[in[i] / 16];
+		out[2 * i + 1] = alphabet[in[i] % 16];
+	}
+
+	out[BLAKE2_HASH_LENGTH * 2] = 0;
+}
+
+void StringToHash(const wchar_t *in, BYTE *out)
+{
+	int temp;
+
+	for (int i = 0; i < BLAKE2_HASH_LENGTH; i++) {
+		swscanf_s(in + i * 2, L"%02x", &temp);
+		out[i] = (BYTE)temp;
+	}
+}
+
+bool CalculateFileHash(const wchar_t *path, BYTE *hash)
+{
+	blake2b_state blake2;
+	if (blake2b_init(&blake2, BLAKE2_HASH_LENGTH) != 0)
+		return false;
+
+	WinHandle handle = CreateFileW(path, GENERIC_READ, FILE_SHARE_READ,
+			nullptr, OPEN_EXISTING, 0, nullptr);
+	if (handle == INVALID_HANDLE_VALUE)
+		return false;
+
+	vector<BYTE> buf;
+	buf.resize(65536);
+
+	for (;;) {
+		DWORD read = 0;
+		if (!ReadFile(handle, buf.data(), (DWORD)buf.size(), &read,
+					nullptr))
+			return false;
+
+		if (!read)
+			break;
+
+		if (blake2b_update(&blake2, buf.data(), read) != 0)
+			return false;
+	}
+
+	if (blake2b_final(&blake2, hash, BLAKE2_HASH_LENGTH) != 0)
+		return false;
+
+	return true;
+}