103 lines
3.5 KiB
C++
103 lines
3.5 KiB
C++
/*
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* Copyright (C) 2015 Emeric Poupon
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*
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* This file is part of LMS.
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*
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* LMS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* LMS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with LMS. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "EncodedImage.hpp"
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#include <filesystem>
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#include <fstream>
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#include <unordered_map>
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#include "core/ITraceLogger.hpp"
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#include "core/String.hpp"
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#include "image/Exception.hpp"
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namespace lms::image
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{
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namespace
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{
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std::string_view extensionToMimeType(const std::filesystem::path& extension)
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{
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static const std::unordered_map<std::string_view, std::string_view> mimeTypesByExtension{
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{ ".bmp", "image/bmp" },
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{ ".gif", "image/gif" },
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{ ".jpeg", "image/jpeg" },
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{ ".jpg", "image/jpeg" },
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{ ".png", "image/png" },
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{ ".ppm", "image/x-portable-pixmap" },
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{ ".svg", "image/svg+xml" },
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};
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const auto it{ mimeTypesByExtension.find(core::stringUtils::stringToLower(extension.c_str())) };
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if (it == std::cend(mimeTypesByExtension))
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throw Exception{ "Unhandled image extension '" + extension.string() + "'" };
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return it->second;
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}
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std::vector<std::byte> fileToBuffer(const std::filesystem::path& p)
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{
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LMS_SCOPED_TRACE_DETAILED("Image", "ReadFile");
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std::ifstream ifs{ p, std::ios::binary };
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if (!ifs.is_open())
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throw Exception{ "Cannot open file '" + p.string() + "' for reading purpose" };
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std::vector<std::byte> data;
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// read file content
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ifs.seekg(0, std::ios::end);
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std::streamsize size = ifs.tellg();
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if (size < 0)
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throw Exception{ "Cannot determine file size for '" + p.string() + "'" };
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ifs.seekg(0, std::ios::beg);
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data.resize(size);
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if (!ifs.read(reinterpret_cast<char*>(data.data()), size))
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throw Exception{ "Cannot read file content for '" + p.string() + "'" };
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return data;
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}
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} // namespace
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std::unique_ptr<IEncodedImage> readImage(const std::filesystem::path& path, std::string_view mimeType)
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{
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return std::make_unique<EncodedImage>(path, mimeType);
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}
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std::unique_ptr<IEncodedImage> readImage(std::span<const std::byte> encodedData, std::string_view mimeType)
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{
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return std::make_unique<EncodedImage>(encodedData, mimeType);
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}
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EncodedImage::EncodedImage(std::vector<std::byte>&& data, std::string_view mimeType)
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: _data{ std::move(data) }
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, _mimeType(mimeType)
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{
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}
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EncodedImage::EncodedImage(std::span<const std::byte> data, std::string_view mimeType)
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: _data(std::cbegin(data), std::cend(data))
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, _mimeType(mimeType)
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{
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}
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EncodedImage::EncodedImage(const std::filesystem::path& p, std::string_view mimeType)
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: EncodedImage::EncodedImage{ fileToBuffer(p), mimeType.empty() ? extensionToMimeType(p.extension()) : mimeType }
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{
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}
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} // namespace lms::image
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