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78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
/*
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* Copyright (c) 2023 Lain Bailey <lain@obsproject.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "updater.hpp"
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#include <util/windows/WinHandle.hpp>
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#include <vector>
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using namespace std;
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void HashToString(const B2Hash &in, string &out)
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{
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constexpr char alphabet[] = "0123456789abcdef";
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out.resize(kBlake2StrLength);
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for (size_t i = 0; i != kBlake2HashLength; ++i) {
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out[2 * i] = alphabet[(uint8_t)in[i] / 16];
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out[2 * i + 1] = alphabet[(uint8_t)in[i] % 16];
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}
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}
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void StringToHash(const string &in, B2Hash &out)
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{
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unsigned int temp;
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const char *str = in.c_str();
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for (size_t i = 0; i < kBlake2HashLength; i++) {
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sscanf_s(str + i * 2, "%02x", &temp);
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out[i] = static_cast<std::byte>(temp);
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}
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}
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bool CalculateFileHash(const wchar_t *path, B2Hash &hash)
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{
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static __declspec(thread) vector<BYTE> hashBuffer;
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blake2b_state blake2;
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if (blake2b_init(&blake2, kBlake2HashLength) != 0)
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return false;
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hashBuffer.resize(1048576);
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WinHandle handle = CreateFileW(path, GENERIC_READ, FILE_SHARE_READ,
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nullptr, OPEN_EXISTING, 0, nullptr);
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if (handle == INVALID_HANDLE_VALUE)
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return false;
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for (;;) {
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DWORD read = 0;
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if (!ReadFile(handle, hashBuffer.data(),
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(DWORD)hashBuffer.size(), &read, nullptr))
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return false;
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if (!read)
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break;
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if (blake2b_update(&blake2, hashBuffer.data(), read) != 0)
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return false;
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}
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if (blake2b_final(&blake2, hash.data(), hash.size()) != 0)
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return false;
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return true;
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}
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