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66 lines
2.3 KiB
C++
66 lines
2.3 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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#include "helper_functions.hpp"
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#include <cmath>
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#include <cstring>
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#include <numeric>
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#include "convert.hpp"
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#include "enforce.hpp"
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std::string string_from_unterminated(const char* data, size_t data_length) {
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if (data_length == 0) {
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return {};
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}
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const size_t StringLength = strnlen(data, data_length);
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return {data, StringLength};
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}
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namespace Exiv2 {
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uint64_t readQWORDTag(const BasicIo::UniquePtr& io) {
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Internal::enforce(QWORD <= io->size() - io->tell(), Exiv2::ErrorCode::kerCorruptedMetadata);
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DataBuf FieldBuf = io->read(QWORD);
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return FieldBuf.read_uint64(0, littleEndian);
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}
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uint32_t readDWORDTag(const BasicIo::UniquePtr& io) {
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Internal::enforce(DWORD <= io->size() - io->tell(), Exiv2::ErrorCode::kerCorruptedMetadata);
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DataBuf FieldBuf = io->read(DWORD);
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return FieldBuf.read_uint32(0, littleEndian);
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}
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uint16_t readWORDTag(const BasicIo::UniquePtr& io) {
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Internal::enforce(WORD <= io->size() - io->tell(), Exiv2::ErrorCode::kerCorruptedMetadata);
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DataBuf FieldBuf = io->read(WORD);
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return FieldBuf.read_uint16(0, littleEndian);
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}
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std::string readStringWcharTag(const BasicIo::UniquePtr& io, size_t length) {
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Internal::enforce(length <= io->size() - io->tell(), Exiv2::ErrorCode::kerCorruptedMetadata);
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DataBuf FieldBuf(length + 1);
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io->readOrThrow(FieldBuf.data(), length, ErrorCode::kerFailedToReadImageData);
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std::string wst(FieldBuf.begin(), FieldBuf.end() - 3);
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if (wst.size() % 2 != 0)
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Exiv2::convertStringCharset(wst, "UCS-2LE", "UTF-8");
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Exiv2::convertStringCharset(wst, "UCS-2LE", "UTF-8");
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return wst;
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}
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std::string readStringTag(const BasicIo::UniquePtr& io, size_t length) {
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Internal::enforce(length <= io->size() - io->tell(), Exiv2::ErrorCode::kerCorruptedMetadata);
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DataBuf FieldBuf(length + 1);
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io->readOrThrow(FieldBuf.data(), length, ErrorCode::kerFailedToReadImageData);
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return Exiv2::toString(FieldBuf.data()).substr(0, length);
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}
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std::string getAspectRatio(uint64_t width, uint64_t height) {
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if (height == 0 || width == 0)
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return std::to_string(width) + ":" + std::to_string(height);
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auto ratioWidth = width / std::gcd(width, height);
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auto ratioHeight = height / std::gcd(width, height);
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return std::to_string(ratioWidth) + ":" + std::to_string(ratioHeight);
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}
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} // namespace Exiv2
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