icy_metadata: convert to C++

5 files changed, 137 insertions, 165 deletions

diff --git a/Makefile.am b/Makefile.am
index e38e9ee7..fe922a6a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -88,7 +88,6 @@ mpd_headers = \
 	src/despotify_utils.h \
 	src/text_input_stream.h \
 	src/icy_server.h \
-	src/icy_metadata.h \
 	src/server_socket.h \
 	src/ls.h \
 	src/mixer_api.h \
@@ -733,7 +732,7 @@ INPUT_LIBS = \
 if ENABLE_CURL
 libinput_a_SOURCES += \
 	src/input/CurlInputPlugin.cxx src/input/CurlInputPlugin.hxx \
-	src/icy_metadata.c
+	src/IcyMetaDataParser.cxx src/IcyMetaDataParser.hxx
 endif
 
 if ENABLE_SOUP
diff --git a/src/icy_metadata.c b/src/IcyMetaDataParser.cxx
index 32953e69..cda63da4 100644
--- a/src/icy_metadata.c
+++ b/src/IcyMetaDataParser.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -18,7 +18,7 @@
  */
 
 #include "config.h"
-#include "icy_metadata.h"
+#include "IcyMetaDataParser.hxx"
 #include "tag.h"
 
 #include <glib.h>
@@ -30,46 +30,37 @@
 #define G_LOG_DOMAIN "icy_metadata"
 
 void
-icy_deinit(struct icy_metadata *im)
+IcyMetaDataParser::Reset()
 {
-	if (!icy_defined(im))
+	if (!IsDefined())
 		return;
 
-	if (im->data_rest == 0 && im->meta_size > 0)
-		g_free(im->meta_data);
+	if (data_rest == 0 && meta_size > 0)
+		g_free(meta_data);
 
-	if (im->tag != NULL)
-		tag_free(im->tag);
-}
-
-void
-icy_reset(struct icy_metadata *im)
-{
-	if (!icy_defined(im))
-		return;
-
-	icy_deinit(im);
+	if (tag != nullptr)
+		tag_free(tag);
 
-	im->data_rest = im->data_size;
-	im->meta_size = 0;
+	data_rest = data_size;
+	meta_size = 0;
 }
 
 size_t
-icy_data(struct icy_metadata *im, size_t length)
+IcyMetaDataParser::Data(size_t length)
 {
 	assert(length > 0);
 
-	if (!icy_defined(im))
+	if (!IsDefined())
 		return length;
 
-	if (im->data_rest == 0)
+	if (data_rest == 0)
 		return 0;
 
-	if (length >= im->data_rest) {
-		length = im->data_rest;
-		im->data_rest = 0;
+	if (length >= data_rest) {
+		length = data_rest;
+		data_rest = 0;
 	} else
-		im->data_rest -= length;
+		data_rest -= length;
 
 	return length;
 }
@@ -94,7 +85,7 @@ icy_parse_tag_item(struct tag *tag, const char *item)
 {
 	gchar **p = g_strsplit(item, "=", 0);
 
-	if (p[0] != NULL && p[1] != NULL) {
+	if (p[0] != nullptr && p[1] != nullptr) {
 		if (strcmp(p[0], "StreamTitle") == 0)
 			icy_add_item(tag, TAG_TITLE, p[1]);
 		else
@@ -110,7 +101,7 @@ icy_parse_tag(const char *p)
 	struct tag *tag = tag_new();
 	gchar **items = g_strsplit(p, ";", 0);
 
-	for (unsigned i = 0; items[i] != NULL; ++i)
+	for (unsigned i = 0; items[i] != nullptr; ++i)
 		icy_parse_tag_item(tag, items[i]);
 
 	g_strfreev(items);
@@ -119,21 +110,21 @@ icy_parse_tag(const char *p)
 }
 
 size_t
-icy_meta(struct icy_metadata *im, const void *data, size_t length)
+IcyMetaDataParser::Meta(const void *data, size_t length)
 {
-	const unsigned char *p = data;
+	const unsigned char *p = (const unsigned char *)data;
 
-	assert(icy_defined(im));
-	assert(im->data_rest == 0);
+	assert(IsDefined());
+	assert(data_rest == 0);
 	assert(length > 0);
 
-	if (im->meta_size == 0) {
+	if (meta_size == 0) {
 		/* read meta_size from the first byte of a meta
 		   block */
-		im->meta_size = *p++ * 16;
-		if (im->meta_size == 0) {
+		meta_size = *p++ * 16;
+		if (meta_size == 0) {
 			/* special case: no metadata */
-			im->data_rest = im->data_size;
+			data_rest = data_size;
 			return 1;
 		}
 
@@ -143,39 +134,39 @@ icy_meta(struct icy_metadata *im, const void *data, size_t length)
 
 		/* initialize metadata reader, allocate enough
 		   memory (+1 for the null terminator) */
-		im->meta_position = 0;
-		im->meta_data = g_malloc(im->meta_size + 1);
+		meta_position = 0;
+		meta_data = (char *)g_malloc(meta_size + 1);
 	}
 
-	assert(im->meta_position < im->meta_size);
+	assert(meta_position < meta_size);
 
-	if (length > im->meta_size - im->meta_position)
-		length = im->meta_size - im->meta_position;
+	if (length > meta_size - meta_position)
+		length = meta_size - meta_position;
 
-	memcpy(im->meta_data + im->meta_position, p, length);
-	im->meta_position += length;
+	memcpy(meta_data + meta_position, p, length);
+	meta_position += length;
 
 	if (p != data)
 		/* re-add the first byte (which contained meta_size) */
 		++length;
 
-	if (im->meta_position == im->meta_size) {
+	if (meta_position == meta_size) {
 		/* null-terminate the string */
 
-		im->meta_data[im->meta_size] = 0;
+		meta_data[meta_size] = 0;
 
 		/* parse */
 
-		if (im->tag != NULL)
-			tag_free(im->tag);
+		if (tag != nullptr)
+			tag_free(tag);
 
-		im->tag = icy_parse_tag(im->meta_data);
-		g_free(im->meta_data);
+		tag = icy_parse_tag(meta_data);
+		g_free(meta_data);
 
 		/* change back to normal data mode */
 
-		im->meta_size = 0;
-		im->data_rest = im->data_size;
+		meta_size = 0;
+		data_rest = data_size;
 	}
 
 	return length;
diff --git a/src/IcyMetaDataParser.hxx b/src/IcyMetaDataParser.hxx
new file mode 100644
index 00000000..6ccc73f5
--- /dev/null
+++ b/src/IcyMetaDataParser.hxx
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2003-2013 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_ICY_META_DATA_PARSER_HXX
+#define MPD_ICY_META_DATA_PARSER_HXX
+
+#include <stddef.h>
+
+class IcyMetaDataParser {
+	size_t data_size, data_rest;
+
+	size_t meta_size, meta_position;
+	char *meta_data;
+
+	struct tag *tag;
+
+public:
+	IcyMetaDataParser():data_size(0) {}
+	~IcyMetaDataParser() {
+		Reset();
+	}
+
+	/**
+	 * Initialize an enabled icy_metadata object with the specified
+	 * data_size (from the icy-metaint HTTP response header).
+	 */
+	void Start(size_t _data_size) {
+		data_size = data_rest = _data_size;
+		meta_size = 0;
+		tag = nullptr;
+	}
+
+	/**
+	 * Resets the icy_metadata.  Call this after rewinding the stream.
+	 */
+	void Reset();
+
+	/**
+	 * Checks whether the icy_metadata object is enabled.
+	 */
+	bool IsDefined() const {
+		return data_size > 0;
+	}
+
+	/**
+	 * Evaluates data.  Returns the number of bytes of normal data which
+	 * can be read by the caller, but not more than "length".  If the
+	 * return value is smaller than "length", the caller should invoke
+	 * icy_meta().
+	 */
+	size_t Data(size_t length);
+
+	/**
+	 * Reads metadata from the stream.  Returns the number of bytes
+	 * consumed.  If the return value is smaller than "length", the caller
+	 * should invoke icy_data().
+	 */
+	size_t Meta(const void *data, size_t length);
+
+	struct tag *ReadTag() {
+		struct tag *result = tag;
+		tag = nullptr;
+		return result;
+	}
+};
+
+#endif
diff --git a/src/icy_metadata.h b/src/icy_metadata.h
deleted file mode 100644
index 9797122c..00000000
--- a/src/icy_metadata.h
+++ /dev/null
@@ -1,99 +0,0 @@
-/*
- * Copyright (C) 2003-2011 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 ICY_METADATA_H
-#define ICY_METADATA_H
-
-#include <stdbool.h>
-#include <stddef.h>
-
-struct icy_metadata {
-	size_t data_size, data_rest;
-
-	size_t meta_size, meta_position;
-	char *meta_data;
-
-	struct tag *tag;
-};
-
-/**
- * Initialize a disabled icy_metadata object.
- */
-static inline void
-icy_clear(struct icy_metadata *im)
-{
-	im->data_size = 0;
-}
-
-/**
- * Initialize an enabled icy_metadata object with the specified
- * data_size (from the icy-metaint HTTP response header).
- */
-static inline void
-icy_start(struct icy_metadata *im, size_t data_size)
-{
-	im->data_size = im->data_rest = data_size;
-	im->meta_size = 0;
-	im->tag = NULL;
-}
-
-/**
- * Resets the icy_metadata.  Call this after rewinding the stream.
- */
-void
-icy_reset(struct icy_metadata *im);
-
-void
-icy_deinit(struct icy_metadata *im);
-
-/**
- * Checks whether the icy_metadata object is enabled.
- */
-static inline bool
-icy_defined(const struct icy_metadata *im)
-{
-	return im->data_size > 0;
-}
-
-/**
- * Evaluates data.  Returns the number of bytes of normal data which
- * can be read by the caller, but not more than "length".  If the
- * return value is smaller than "length", the caller should invoke
- * icy_meta().
- */
-size_t
-icy_data(struct icy_metadata *im, size_t length);
-
-/**
- * Reads metadata from the stream.  Returns the number of bytes
- * consumed.  If the return value is smaller than "length", the caller
- * should invoke icy_data().
- */
-size_t
-icy_meta(struct icy_metadata *im, const void *data, size_t length);
-
-static inline struct tag *
-icy_tag(struct icy_metadata *im)
-{
-	struct tag *tag = im->tag;
-	im->tag = NULL;
-	return tag;
-}
-
-#endif
diff --git a/src/input/CurlInputPlugin.cxx b/src/input/CurlInputPlugin.cxx
index b329d626..08df6cbd 100644
--- a/src/input/CurlInputPlugin.cxx
+++ b/src/input/CurlInputPlugin.cxx
@@ -22,10 +22,10 @@
 #include "input_plugin.h"
 #include "conf.h"
 #include "tag.h"
+#include "IcyMetaDataParser.hxx"
 
 extern "C" {
 #include "input_internal.h"
-#include "icy_metadata.h"
 }
 
 #include "IOThread.hxx"
@@ -106,7 +106,7 @@ struct input_curl {
 	char error[CURL_ERROR_SIZE];
 
 	/** parser for icy-metadata */
-	struct icy_metadata icy_metadata;
+	IcyMetaDataParser icy;
 
 	/** the stream name from the icy-name response header */
 	char *meta_name;
@@ -125,7 +125,6 @@ struct input_curl {
 		 tag(nullptr),
 		 postponed_error(nullptr) {
 		input_stream_init(&base, &input_plugin_curl, url, mutex, cond);
-		icy_clear(&icy_metadata);
 	}
 
 	~input_curl();
@@ -811,7 +810,7 @@ consume_buffer(struct buffer *buffer, size_t length)
 }
 
 static size_t
-read_from_buffer(struct icy_metadata *icy_metadata, GQueue *buffers,
+read_from_buffer(IcyMetaDataParser &icy, GQueue *buffers,
 		 void *dest0, size_t length)
 {
 	struct buffer *buffer = (struct buffer *)g_queue_pop_head(buffers);
@@ -827,7 +826,7 @@ read_from_buffer(struct icy_metadata *icy_metadata, GQueue *buffers,
 	while (true) {
 		size_t chunk;
 
-		chunk = icy_data(icy_metadata, length);
+		chunk = icy.Data(length);
 		if (chunk > 0) {
 			memcpy(dest, buffer->data + buffer->consumed,
 			       chunk);
@@ -843,8 +842,7 @@ read_from_buffer(struct icy_metadata *icy_metadata, GQueue *buffers,
 			assert(buffer != NULL);
 		}
 
-		chunk = icy_meta(icy_metadata, buffer->data + buffer->consumed,
-				 length);
+		chunk = icy.Meta(buffer->data + buffer->consumed, length);
 		if (chunk > 0) {
 			buffer = consume_buffer(buffer, chunk);
 
@@ -866,7 +864,7 @@ read_from_buffer(struct icy_metadata *icy_metadata, GQueue *buffers,
 static void
 copy_icy_tag(struct input_curl *c)
 {
-	struct tag *tag = icy_tag(&c->icy_metadata);
+	struct tag *tag = c->icy.ReadTag();
 
 	if (tag == NULL)
 		return;
@@ -908,7 +906,7 @@ input_curl_read(struct input_stream *is, void *ptr, size_t size,
 		/* send buffer contents */
 
 		while (size > 0 && !g_queue_is_empty(c->buffers)) {
-			size_t copy = read_from_buffer(&c->icy_metadata, c->buffers,
+			size_t copy = read_from_buffer(c->icy, c->buffers,
 						       dest + nbytes, size);
 
 			nbytes += copy;
@@ -916,7 +914,7 @@ input_curl_read(struct input_stream *is, void *ptr, size_t size,
 		}
 	} while (nbytes == 0);
 
-	if (icy_defined(&c->icy_metadata))
+	if (c->icy.IsDefined())
 		copy_icy_tag(c);
 
 	is->offset += (goffset)nbytes;
@@ -979,7 +977,7 @@ input_curl_headerfunction(void *ptr, size_t size, size_t nmemb, void *stream)
 
 	if (g_ascii_strcasecmp(name, "accept-ranges") == 0) {
 		/* a stream with icy-metadata is not seekable */
-		if (!icy_defined(&c->icy_metadata))
+		if (!c->icy.IsDefined())
 			c->base.seekable = true;
 	} else if (g_ascii_strcasecmp(name, "content-length") == 0) {
 		char buffer[64];
@@ -1010,7 +1008,7 @@ input_curl_headerfunction(void *ptr, size_t size, size_t nmemb, void *stream)
 		size_t icy_metaint;
 
 		if ((size_t)(end - header) >= sizeof(buffer) ||
-		    icy_defined(&c->icy_metadata))
+		    c->icy.IsDefined())
 			return size;
 
 		memcpy(buffer, value, end - value);
@@ -1020,7 +1018,7 @@ input_curl_headerfunction(void *ptr, size_t size, size_t nmemb, void *stream)
 		g_debug("icy-metaint=%zu", icy_metaint);
 
 		if (icy_metaint > 0) {
-			icy_start(&c->icy_metadata, icy_metaint);
+			c->icy.Start(icy_metaint);
 
 			/* a stream with icy-metadata is not
 			   seekable */