DespotifyUtils, Expat: move to lib/

src/lib/despotify/DespotifyUtils.cxx

@@ -0,0 +1,153 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "DespotifyUtils.hxx"
+#include "tag/Tag.hxx"
+#include "tag/TagBuilder.hxx"
+#include "config/ConfigGlobal.hxx"
+#include "config/ConfigOption.hxx"
+#include "util/Domain.hxx"
+#include "Log.hxx"
+
+extern "C" {
+#include <despotify.h>
+}
+
+#include <stdio.h>
+
+const Domain despotify_domain("despotify");
+
+static struct despotify_session *g_session;
+static void (*registered_callbacks[8])(struct despotify_session *,
+		int, void *, void *);
+static void *registered_callback_data[8];
+
+static void
+callback(struct despotify_session* ds, int sig,
+	 void *data, gcc_unused void *callback_data)
+{
+	size_t i;
+
+	for (i = 0; i < sizeof(registered_callbacks) / sizeof(registered_callbacks[0]); i++) {
+		void (*cb)(struct despotify_session *, int, void *, void *) = registered_callbacks[i];
+		void *cb_data = registered_callback_data[i];
+
+		if (cb)
+			cb(ds, sig, data, cb_data);
+	}
+}
+
+bool mpd_despotify_register_callback(void (*cb)(struct despotify_session *, int, void *, void *),
+		void *cb_data)
+{
+	size_t i;
+
+	for (i = 0; i < sizeof(registered_callbacks) / sizeof(registered_callbacks[0]); i++) {
+
+		if (!registered_callbacks[i]) {
+			registered_callbacks[i] = cb;
+			registered_callback_data[i] = cb_data;
+
+			return true;
+		}
+	}
+
+	return false;
+}
+
+void mpd_despotify_unregister_callback(void (*cb)(struct despotify_session *, int, void *, void *))
+{
+	size_t i;
+
+	for (i = 0; i < sizeof(registered_callbacks) / sizeof(registered_callbacks[0]); i++) {
+
+		if (registered_callbacks[i] == cb) {
+			registered_callbacks[i] = nullptr;
+		}
+	}
+}
+
+Tag
+mpd_despotify_tag_from_track(const ds_track &track)
+{
+	char tracknum[20];
+	char comment[80];
+	char date[20];
+
+	if (!track.has_meta_data)
+		return Tag();
+
+	TagBuilder tag;
+	snprintf(tracknum, sizeof(tracknum), "%d", track.tracknumber);
+	snprintf(date, sizeof(date), "%d", track.year);
+	snprintf(comment, sizeof(comment), "Bitrate %d Kbps, %sgeo restricted",
+		 track.file_bitrate / 1000,
+		 track.geo_restricted ? "" : "not ");
+	tag.AddItem(TAG_TITLE, track.title);
+	tag.AddItem(TAG_ARTIST, track.artist->name);
+	tag.AddItem(TAG_TRACK, tracknum);
+	tag.AddItem(TAG_ALBUM, track.album);
+	tag.AddItem(TAG_DATE, date);
+	tag.AddItem(TAG_COMMENT, comment);
+	tag.SetTime(track.length / 1000);
+
+	return tag.Commit();
+}
+
+struct despotify_session *mpd_despotify_get_session(void)
+{
+	const char *user;
+	const char *passwd;
+	bool high_bitrate;
+
+	if (g_session)
+		return g_session;
+
+	user = config_get_string(CONF_DESPOTIFY_USER, nullptr);
+	passwd = config_get_string(CONF_DESPOTIFY_PASSWORD, nullptr);
+	high_bitrate = config_get_bool(CONF_DESPOTIFY_HIGH_BITRATE, true);
+
+	if (user == nullptr || passwd == nullptr) {
+		LogDebug(despotify_domain,
+			 "disabling despotify because account is not configured");
+		return nullptr;
+	}
+
+	if (!despotify_init()) {
+		LogWarning(despotify_domain, "Can't initialize despotify");
+		return nullptr;
+	}
+
+	g_session = despotify_init_client(callback, nullptr,
+					  high_bitrate, true);
+	if (!g_session) {
+		LogWarning(despotify_domain,
+			   "Can't initialize despotify client");
+		return nullptr;
+	}
+
+	if (!despotify_authenticate(g_session, user, passwd)) {
+		LogWarning(despotify_domain,
+			   "Can't authenticate despotify session");
+		despotify_exit(g_session);
+		return nullptr;
+	}
+
+	return g_session;
+}

src/lib/despotify/DespotifyUtils.hxx

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_DESPOTIFY_H
+#define MPD_DESPOTIFY_H
+
+struct Tag;
+struct despotify_session;
+struct ds_track;
+
+extern const class Domain despotify_domain;
+
+/**
+ * Return the current despotify session.
+ *
+ * If the session isn't initialized, this function will initialize
+ * it and connect to Spotify.
+ *
+ * @return a pointer to the despotify session, or nullptr if it can't
+ *         be initialized (e.g., if the configuration isn't supplied)
+ */
+struct despotify_session *mpd_despotify_get_session(void);
+
+/**
+ * Create a MPD tags structure from a spotify track
+ *
+ * @param track the track to convert
+ *
+ * @return filled in #Tag structure
+ */
+Tag
+mpd_despotify_tag_from_track(const ds_track &track);
+
+/**
+ * Register a despotify callback.
+ *
+ * Despotify calls this e.g., when a track ends.
+ *
+ * @param cb the callback
+ * @param cb_data the data to pass to the callback
+ *
+ * @return true if the callback could be registered
+ */
+bool mpd_despotify_register_callback(void (*cb)(struct despotify_session *, int, void *, void *),
+		void *cb_data);
+
+/**
+ * Unregister a despotify callback.
+ *
+ * @param cb the callback to unregister.
+ */
+void mpd_despotify_unregister_callback(void (*cb)(struct despotify_session *, int, void *, void *));
+
+#endif
+

src/lib/expat/ExpatParser.cxx

@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "ExpatParser.hxx"
+#include "input/InputStream.hxx"
+#include "util/ASCII.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+
+#include <string.h>
+
+static constexpr Domain expat_domain("expat");
+
+void
+ExpatParser::SetError(Error &error)
+{
+	XML_Error code = XML_GetErrorCode(parser);
+	error.Format(expat_domain, int(code), "XML parser failed: %s",
+		     XML_ErrorString(code));
+}
+
+bool
+ExpatParser::Parse(const char *data, size_t length, bool is_final,
+		   Error &error)
+{
+	bool success = XML_Parse(parser, data, length,
+				 is_final) == XML_STATUS_OK;
+	if (!success)
+		SetError(error);
+
+	return success;
+}
+
+bool
+ExpatParser::Parse(InputStream &is, Error &error)
+{
+	assert(is.ready);
+
+	while (true) {
+		char buffer[4096];
+		size_t nbytes = is.LockRead(buffer, sizeof(buffer), error);
+		if (nbytes == 0)
+			break;
+
+		if (!Parse(buffer, nbytes, false, error))
+			return false;
+	}
+
+	if (error.IsDefined())
+		return false;
+
+	return Parse("", 0, true, error);
+}
+
+const char *
+ExpatParser::GetAttribute(const XML_Char **atts,
+			  const char *name)
+{
+	for (unsigned i = 0; atts[i] != nullptr; i += 2)
+		if (strcmp(atts[i], name) == 0)
+			return atts[i + 1];
+
+	return nullptr;
+}
+
+const char *
+ExpatParser::GetAttributeCase(const XML_Char **atts,
+			      const char *name)
+{
+	for (unsigned i = 0; atts[i] != nullptr; i += 2)
+		if (StringEqualsCaseASCII(atts[i], name))
+			return atts[i + 1];
+
+	return nullptr;
+}

src/lib/expat/ExpatParser.hxx

@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_EXPAT_HXX
+#define MPD_EXPAT_HXX
+
+#include "check.h"
+#include "Compiler.h"
+
+#include <expat.h>
+
+struct InputStream;
+class Error;
+
+class ExpatParser final {
+	const XML_Parser parser;
+
+public:
+	ExpatParser(void *userData)
+		:parser(XML_ParserCreate(nullptr)) {
+		XML_SetUserData(parser, userData);
+	}
+
+	~ExpatParser() {
+		XML_ParserFree(parser);
+	}
+
+	void SetElementHandler(XML_StartElementHandler start,
+			       XML_EndElementHandler end) {
+		XML_SetElementHandler(parser, start, end);
+	}
+
+	void SetCharacterDataHandler(XML_CharacterDataHandler charhndl) {
+		XML_SetCharacterDataHandler(parser, charhndl);
+	}
+
+	bool Parse(const char *data, size_t length, bool is_final,
+		   Error &error);
+
+	bool Parse(InputStream &is, Error &error);
+
+	gcc_pure
+	static const char *GetAttribute(const XML_Char **atts,
+					const char *name);
+
+	gcc_pure
+	static const char *GetAttributeCase(const XML_Char **atts,
+					    const char *name);
+
+private:
+	void SetError(Error &error);
+};
+
+/**
+ * A specialization of #ExpatParser that provides the most common
+ * callbacks as virtual methods.
+ */
+class CommonExpatParser {
+	ExpatParser parser;
+
+public:
+	CommonExpatParser():parser(this) {
+		parser.SetElementHandler(StartElement, EndElement);
+		parser.SetCharacterDataHandler(CharacterData);
+	}
+
+	bool Parse(const char *data, size_t length, bool is_final,
+		   Error &error) {
+		return parser.Parse(data, length, is_final, error);
+	}
+
+	bool Parse(InputStream &is, Error &error) {
+		return parser.Parse(is, error);
+	}
+
+	gcc_pure
+	static const char *GetAttribute(const XML_Char **atts,
+					const char *name) {
+		return ExpatParser::GetAttribute(atts, name);
+	}
+
+	gcc_pure
+	static const char *GetAttributeCase(const XML_Char **atts,
+					    const char *name) {
+		return ExpatParser::GetAttributeCase(atts, name);
+	}
+
+protected:
+	virtual void StartElement(const XML_Char *name,
+				  const XML_Char **atts) = 0;
+	virtual void EndElement(const XML_Char *name) = 0;
+	virtual void CharacterData(const XML_Char *s, int len) = 0;
+
+private:
+	static void XMLCALL StartElement(void *user_data, const XML_Char *name,
+					 const XML_Char **atts) {
+		CommonExpatParser &p = *(CommonExpatParser *)user_data;
+		p.StartElement(name, atts);
+	}
+
+	static void XMLCALL EndElement(void *user_data, const XML_Char *name) {
+		CommonExpatParser &p = *(CommonExpatParser *)user_data;
+		p.EndElement(name);
+	}
+
+	static void XMLCALL CharacterData(void *user_data,
+					  const XML_Char *s, int len) {
+		CommonExpatParser &p = *(CommonExpatParser *)user_data;
+		p.CharacterData(s, len);
+	}
+};
+
+#endif