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100 lines
2.9 KiB
C++
100 lines
2.9 KiB
C++
// Copyright (c) 2017-2020, Mudita Sp. z.o.o. All rights reserved.
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// For licensing, see https://github.com/mudita/MuditaOS/LICENSE.md
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#include "Utils.hpp"
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#include <filesystem>
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#include <crc32/crc32.h>
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namespace utils::filesystem
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{
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namespace
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{
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inline constexpr auto crc_buf_len = 1024;
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} // namespace
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unsigned long computeFileCRC32(std::FILE *file) noexcept
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{
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auto buf = std::make_unique<unsigned char[]>(crc_buf_len);
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unsigned long crc32 = 0;
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while (!std::feof(file)) {
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size_t dataLen = std::fread(buf.get(), 1, crc_buf_len, file);
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if (dataLen == 0) {
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return crc32;
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}
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crc32 = Crc32_ComputeBuf(crc32, buf.get(), dataLen);
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}
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return crc32;
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}
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std::string generateRandomId(std::size_t length) noexcept
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{
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const std::string CHARACTERS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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std::random_device random_device;
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std::mt19937 generator(random_device());
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generator.seed(utils::time::Timestamp().getTime());
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std::uniform_int_distribution<> distribution(0, CHARACTERS.size() - 1);
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std::string random_string;
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for (std::size_t i = 0; i < length; ++i) {
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random_string += CHARACTERS[distribution(generator)];
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}
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return random_string;
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}
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std::string getline(std::FILE *stream, uint32_t length) noexcept
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{
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std::uint32_t currentPosition = std::ftell(stream);
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// allocate memory to read number of signs defined by length param. Size of buffer is increased by 1 to add
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// string's null terminator.
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auto buffer = std::make_unique<char[]>(length + 1);
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std::uint32_t bytesRead = std::fread(buffer.get(), 1, length, stream);
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// search buffer for /n sign
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constexpr auto newLineSign = 0x0A;
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for (std::uint32_t i = 0; i < bytesRead; ++i) {
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if (buffer[i] == newLineSign) {
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buffer[i] = 0;
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std::fseek(stream, currentPosition + i + 1, SEEK_SET);
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break;
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}
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}
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std::string ret = std::string(buffer.get());
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return ret;
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}
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} // namespace utils::filesystem
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namespace utils
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{
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std::vector<std::uint8_t> hexToBytes(const std::string &hex)
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{
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std::vector<std::uint8_t> bytes;
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for (unsigned int i = 0; i < hex.length(); i += 2) {
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std::string byteString = hex.substr(i, 2);
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std::uint8_t byte = std::stoull(byteString.c_str(), nullptr, 16);
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bytes.push_back(byte);
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}
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return bytes;
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}
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std::string bytesToHex(const std::vector<std::uint8_t> &bytes)
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{
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std::stringstream s;
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s.fill('0');
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for (auto const &b : bytes)
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s << std::setw(2) << std::hex << (unsigned short)b;
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return s.str();
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}
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} // namespace utils
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