fix: fix various issues and bugs with dpp::emoji

include/dpp/emoji.h

@@ -55,38 +55,66 @@ class DPP_EXPORT emoji : public managed, public json_interface<emoji>  {
 	/**
 	 * @brief Emoji name
 	 */
-	std::string name;
+	std::string name{};
 	/**
 	 * @brief User id who uploaded the emoji
 	 */
-	snowflake user_id;
+	snowflake user_id{0};
 	/**
 	 * @brief Flags for the emoji from dpp::emoji_flags
 	 */
-	uint8_t flags;
+	uint8_t flags{0};
 	/**
 	 * @brief Image data for the emoji if uploading
 	 */
-	std::string* image_data;
-	
+	std::string image_data{};
+
 	/**
 	 * @brief Construct a new emoji object
 	 */
-	emoji();
+	emoji() = default;
 
 	/**
 	 * @brief Construct a new emoji object with name, ID and flags
-	 * 
-	 * @param n The emoji's name
-	 * @param i ID, if it has one (unicode does not)
-	 * @param f Emoji flags (emoji_flags)
+	 *
+	 * @param name The emoji's name
+	 * @param id ID, if it has one (unicode does not)
+	 * @param flags Emoji flags (emoji_flags)
 	 */
-	emoji(const std::string n, const snowflake i = 0, const uint8_t f = 0);
+	emoji(const std::string_view name, const snowflake id = 0, const uint8_t flags = 0);
+
+	/**
+	 * @brief Copy constructor, copies another emoji's data
+	 *
+	 * @param rhs Emoji to copy
+	 */
+	emoji(const emoji &rhs) = default;
+
+	/**
+	 * @brief Move constructor, moves another emoji's data to this
+	 *
+	 * @param rhs Emoji to move from
+	 */
+	emoji(emoji &&rhs) noexcept = default;
 
 	/**
 	 * @brief Destroy the emoji object
 	 */
-	virtual ~emoji();
+	~emoji() override = default;
+
+	/**
+	 * @brief Copy assignment operator, copies another emoji's data
+	 *
+	 * @param rhs Emoji to copy
+	 */
+	emoji &operator=(const emoji &rhs) = default;
+
+	/**
+	 * @brief Move constructor, moves another emoji's data to this
+	 *
+	 * @param rhs Emoji to move from
+	 */
+	emoji &operator=(emoji &&rhs) noexcept = default;
 
 	/**
 	* @brief Create a mentionable emoji
@@ -95,35 +123,35 @@ class DPP_EXPORT emoji : public managed, public json_interface<emoji>  {
 	* @param is_animated is emoji animated.
 	* @return std::string The formatted mention of the emoji.
 	*/
-	static std::string get_mention(const std::string& name, const snowflake& id, bool is_animated = false);
+	static std::string get_mention(std::string_view name, snowflake id, bool is_animated = false);
 
 	/**
 	 * @brief Read class values from json object
-	 * 
+	 *
 	 * @param j A json object to read from
 	 * @return A reference to self
 	 */
 	emoji& fill_from_json(nlohmann::json* j);
 
 	/**
 	 * @brief Build the json for this object
-	 * 
+	 *
 	 * @param with_id include the id in the JSON
 	 * @return std::string json data
 	 */
-	std::string build_json(bool with_id = false) const;
+	std::string build_json(bool with_id = false) const override;
 
 	/**
 	 * @brief Emoji requires colons
-	 * 
+	 *
 	 * @return true Requires colons
 	 * @return false Does not require colons
 	 */
 	bool requires_colons() const;
 
 	/**
 	 * @brief Emoji is managed
-	 * 
+	 *
 	 * @return true Is managed
 	 * @return false Is not managed
 	 */
@@ -139,25 +167,25 @@ class DPP_EXPORT emoji : public managed, public json_interface<emoji>  {
 
 	/**
 	 * @brief Is available
-	 * 
+	 *
 	 * @return true Is available
 	 * @return false Is unavailable
 	 */
 	bool is_available() const;
 
 	/**
 	 * @brief Load an image into the object as base64
-	 * 
+	 *
 	 * @param image_blob Image binary data
 	 * @param type Type of image. It can be one of `i_gif`, `i_jpg` or `i_png`.
 	 * @return emoji& Reference to self
 	 * @throw dpp::length_exception Image content exceeds discord maximum of 256 kilobytes
 	 */
-	emoji& load_image(const std::string &image_blob, const image_type type);
+	emoji& load_image(std::string_view image_blob, const image_type type);
 
 	/**
 	 * @brief Format to name if unicode, name:id if has id or a:name:id if animated
-	 * 
+	 *
 	 * @return Formatted name for reactions
 	 */
 	std::string format() const;

include/dpp/utility.h

@@ -500,7 +500,7 @@ namespace dpp {
 		* @param is_animated is emoji animated.
 		* @return std::string The formatted mention of the emoji.
 		*/
-		std::string DPP_EXPORT emoji_mention(const std::string& name, const snowflake& id, bool is_animated = false);
+		std::string DPP_EXPORT emoji_mention(std::string_view name, snowflake id, bool is_animated = false);
 
 		/**
 		* @brief Create a mentionable role.
@@ -509,6 +509,68 @@ namespace dpp {
 		*/
 		std::string DPP_EXPORT role_mention(const snowflake& id);
 
+#ifdef _DOXYGEN_
+		/**
+		 * @brief Get the mime type for an image type.
+		 * @param type Image type
+		 * @return std::string The mime type for this image type
+		 */
+		std::string DPP_EXPORT mime_type(image_type type);
+
+		/**
+		 * @brief Get the mime type for a sticker format.
+		 * @param format Sticker format
+		 * @return std::string The mime type for this sticker format
+		 */
+		std::string DPP_EXPORT mime_type(sticker_format format);
+
+		/**
+		 * @brief Get the file extension for an image type.
+		 * @param type Image type
+		 * @return std::string The file extension (e.g. ".png") for this image type
+		 */
+		std::string DPP_EXPORT file_extension(image_type type);
+
+		/**
+		 * @brief Get the file extension for a sticker format.
+		 * @param format Sticker format
+		 * @return std::string The file extension (e.g. ".png") for this sticker format
+		 */
+		std::string DPP_EXPORT file_extension(sticker_format format);
+#else
+		/**
+		 * @brief Get the mime type for an image type.
+		 * @param type Image type
+		 * @return std::string The mime type for this image type
+		 */
+		template <typename T>
+		extern std::enable_if_t<std::is_same_v<T, image_type>, std::string> DPP_EXPORT mime_type(T type);
+
+		/**
+		 * @brief Get the mime type for a sticker format.
+		 * @param format Sticker format
+		 * @return std::string The mime type for this sticker format
+		 */
+		template <typename T>
+		extern std::enable_if_t<std::is_same_v<T, sticker_format>, std::string> DPP_EXPORT mime_type(T format);
+
+		/**
+		 * @brief Get the file extension for an image type.
+		 * @param type Image type
+		 * @return std::string The file extension (e.g. ".png") for this image type
+		 */
+		template <typename T>
+		extern std::enable_if_t<std::is_same_v<T, image_type>, std::string> DPP_EXPORT file_extension(T type);
+
+		/**
+		 * @brief Get the file extension for a sticker format.
+		 * @param format Sticker format
+		 * @return std::string The file extension (e.g. ".png") for this sticker format
+		 */
+		template <typename T>
+		extern std::enable_if_t<std::is_same_v<T, sticker_format>, std::string> DPP_EXPORT file_extension(T format);
+#endif
+
 		/**
 		 * @brief Returns the library's version string
 		 * 

src/dpp/cluster/sticker.cpp

@@ -23,25 +23,12 @@
 
 namespace dpp {
 
-namespace {
-	std::string get_sticker_mimetype(const sticker &s) {
-		static const std::map<sticker_format, std::string> mime_types = {
-				{ sticker_format::sf_png, "image/png" },
-				{ sticker_format::sf_apng, "image/png" },
-				{ sticker_format::sf_lottie, "application/json" },
-				{ sticker_format::sf_gif, "image/gif" },
-		};
-
-		return mime_types.find(s.format_type)->second;
-	}
-} // namespace
-
 void cluster::guild_sticker_create(sticker &s, command_completion_event_t callback) {
 	this->post_rest(API_PATH "/guilds", std::to_string(s.guild_id), "stickers", m_post, s.build_json(false), [this, callback](json &j, const http_request_completion_t& http) {
 		if (callback) {
 			callback(confirmation_callback_t(this, sticker().fill_from_json(&j), http));
 		}
-	}, s.filename, s.filecontent, get_sticker_mimetype(s));
+	}, s.filename, s.filecontent, utility::mime_type(s.format_type));
 }
 
 void cluster::guild_sticker_delete(snowflake sticker_id, snowflake guild_id, command_completion_event_t callback) {

src/dpp/discordevents.cpp

@@ -210,28 +210,28 @@ void set_bool_not_null(const json* j, const char *keyname, bool &v) {
 
 std::string base64_encode(unsigned char const* buf, unsigned int buffer_length) {
 	/* Quick and dirty base64 encode */
-	static const char to_base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-	size_t ret_size = buffer_length + 2;
-
-	ret_size = 4 * ret_size / 3;
-
+	static constexpr std::string_view to_base64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+	static constexpr auto push = [](std::string &dst, unsigned char b0, unsigned char b1, unsigned char b2) {
+		dst.push_back(to_base64[ ((b0 & 0xfc) >> 2) ]);
+		dst.push_back(to_base64[ ((b0 & 0x03) << 4) + ((b1 & 0xf0) >> 4) ]);
+		dst.push_back(to_base64[ ((b1 & 0x0f) << 2) + ((b2 & 0xc0) >> 6) ]);
+		dst.push_back(to_base64[ ((b2 & 0x3f)) ]);
+	};
+	size_t ret_size = (4 * buffer_length + 2) / 3; // ceil(4*size/3)
+	size_t i = 0;
 	std::string ret;
-	ret.reserve(ret_size);
 
-	for (unsigned int i=0; i<ret_size/4; ++i)
-	{
-		size_t index = i*3;
-		unsigned char b3[3];
-		b3[0] = buf[index+0];
-		b3[1] = buf[index+1];
-		b3[2] = buf[index+2];
+	ret.reserve(ret_size);
 
-		ret.push_back(to_base64[ ((b3[0] & 0xfc) >> 2) ]);
-		ret.push_back(to_base64[ ((b3[0] & 0x03) << 4) + ((b3[1] & 0xf0) >> 4) ]);
-		ret.push_back(to_base64[ ((b3[1] & 0x0f) << 2) + ((b3[2] & 0xc0) >> 6) ]);
-		ret.push_back(to_base64[ ((b3[2] & 0x3f)) ]);
+	if (buffer_length > 3) { //    vvvvv avoid unsigned overflow
+		while (i < buffer_length - 3) {
+			push(ret, buf[i], buf[i + 1], buf[i + 2]);
+			i += 3;
+		}
+	}
+	if (i < buffer_length) { // leftover 1 to 3 bytes
+		push(ret, buf[i], (i + 1 > buffer_length ? 0 : buf[i + 1]), (i + 2 > buffer_length ? 0 : buf[i + 2]));
 	}
-
 	return ret;
 }
 

src/dpp/emoji.cpp

@@ -28,19 +28,9 @@ namespace dpp {
 
 using json = nlohmann::json;
 
-emoji::emoji() : managed(), user_id(0), flags(0), image_data(nullptr)
-{
-}
-
-emoji::emoji(const std::string n, const snowflake i, const uint8_t f) : managed(i), name(n), user_id(0), flags(f), image_data(nullptr)
-{	
-}
+emoji::emoji(const std::string_view n, const snowflake i, const uint8_t f) : managed(i), name(n), flags(f) {}
 
-emoji::~emoji() {
-	delete image_data;
-}
-
-std::string emoji::get_mention(const std::string &name, const snowflake &id, bool is_animated) {
+std::string emoji::get_mention(std::string_view name, snowflake id, bool is_animated) {
 	return utility::emoji_mention(name,id,is_animated);
 }
 
@@ -68,8 +58,8 @@ std::string emoji::build_json(bool with_id) const {
 		j["id"] = std::to_string(id);
 	}
 	j["name"] = name;
-	if (image_data) {
-		j["image"] = *image_data;
+	if (!image_data.empty()) {
+		j["image"] = image_data;
 	}
 	return j.dump();
 }
@@ -90,21 +80,12 @@ bool emoji::is_available() const {
 	return flags & e_available;
 }
 
-emoji& emoji::load_image(const std::string &image_blob, const image_type type) {
-	static const std::map<image_type, std::string> mimetypes = {
-		{ i_gif, "image/gif" },
-		{ i_jpg, "image/jpeg" },
-		{ i_png, "image/png" },
-		{ i_webp, "image/webp" },
-	};
+emoji& emoji::load_image(std::string_view image_blob, const image_type type) {
 	if (image_blob.size() > MAX_EMOJI_SIZE) {
 		throw dpp::length_exception("Emoji file exceeds discord limit of 256 kilobytes");
 	}
 
-	/* If there's already image data defined, free the old data, to prevent a memory leak */
-	delete image_data;
-
-	image_data = new std::string("data:" + mimetypes.find(type)->second + ";base64," + base64_encode((unsigned char const*)image_blob.data(), (unsigned int)image_blob.length()));
+	image_data = "data:" + utility::mime_type(type) + ";base64," + base64_encode(reinterpret_cast<unsigned char const*>(image_blob.data()), static_cast<unsigned int>(image_blob.length()));
 
 	return *this;
 }