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helper_functions.hpp
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helper_functions.hpp
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// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef HELPER_FUNCTIONS_HPP
#define HELPER_FUNCTIONS_HPP
#include <string>
#include "basicio.hpp"
#include "types.hpp"
/*!
@brief Convert a (potentially not null terminated) array into a
std::string.
Convert a C style string that may or may not be null terminated safely
into a std::string. The string's termination is either set at the first \0
or after data_length characters.
@param[in] data A c-string from which the std::string shall be
constructed. Does not need to be null terminated.
@param[in] data_length An upper bound for the string length (must be at most
the allocated length of `buffer`). If no null terminator is found in data,
then the resulting std::string will be null terminated at `data_length`.
*/
std::string string_from_unterminated(const char* data, size_t data_length);
namespace Exiv2 {
static constexpr size_t BYTE = 0x1;
static constexpr size_t WCHAR = 0x2;
static constexpr size_t WORD = 0X2;
static constexpr size_t DWORD = 0x4;
static constexpr size_t QWORD = 0x8;
static constexpr size_t GUID = 0x10;
[[nodiscard]] uint64_t readQWORDTag(const Exiv2::BasicIo::UniquePtr& io);
[[nodiscard]] uint32_t readDWORDTag(const Exiv2::BasicIo::UniquePtr& io);
[[nodiscard]] uint16_t readWORDTag(const Exiv2::BasicIo::UniquePtr& io);
[[nodiscard]] std::string readStringWcharTag(const Exiv2::BasicIo::UniquePtr& io, size_t length);
[[nodiscard]] std::string readStringTag(const Exiv2::BasicIo::UniquePtr& io, size_t length = DWORD);
/*!
@brief Calculates Aspect Ratio of a video
*/
[[nodiscard]] std::string getAspectRatio(uint64_t width, uint64_t height);
} // namespace Exiv2
#endif // HELPER_FUNCTIONS_HPP