input_stream: convert to C++ (internally)

src/InputStream.cxx

@@ -0,0 +1,253 @@
+/*
+ * 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.
+ */
+
+#include "config.h"
+#include "input_stream.h"
+#include "InputRegistry.hxx"
+#include "input_plugin.h"
+
+extern "C" {
+#include "input/rewind_input_plugin.h"
+#include "uri.h"
+}
+
+#include <glib.h>
+#include <assert.h>
+
+static inline GQuark
+input_quark(void)
+{
+	return g_quark_from_static_string("input");
+}
+
+struct input_stream *
+input_stream_open(const char *url,
+		  GMutex *mutex, GCond *cond,
+		  GError **error_r)
+{
+	GError *error = NULL;
+
+	assert(mutex != NULL);
+	assert(error_r == NULL || *error_r == NULL);
+
+	input_plugins_for_each_enabled(plugin) {
+		struct input_stream *is;
+
+		is = plugin->open(url, mutex, cond, &error);
+		if (is != NULL) {
+			assert(is->plugin != NULL);
+			assert(is->plugin->close != NULL);
+			assert(is->plugin->read != NULL);
+			assert(is->plugin->eof != NULL);
+			assert(!is->seekable || is->plugin->seek != NULL);
+
+			is = input_rewind_open(is);
+
+			return is;
+		} else if (error != NULL) {
+			g_propagate_error(error_r, error);
+			return NULL;
+		}
+	}
+
+	g_set_error(error_r, input_quark(), 0, "Unrecognized URI");
+	return NULL;
+}
+
+bool
+input_stream_check(struct input_stream *is, GError **error_r)
+{
+	assert(is != NULL);
+	assert(is->plugin != NULL);
+
+	return is->plugin->check == NULL ||
+		is->plugin->check(is, error_r);
+}
+
+void
+input_stream_update(struct input_stream *is)
+{
+	assert(is != NULL);
+	assert(is->plugin != NULL);
+
+	if (is->plugin->update != NULL)
+		is->plugin->update(is);
+}
+
+void
+input_stream_wait_ready(struct input_stream *is)
+{
+	assert(is != NULL);
+	assert(is->mutex != NULL);
+	assert(is->cond != NULL);
+
+	while (true) {
+		input_stream_update(is);
+		if (is->ready)
+			break;
+
+		g_cond_wait(is->cond, is->mutex);
+	}
+}
+
+void
+input_stream_lock_wait_ready(struct input_stream *is)
+{
+	assert(is != NULL);
+	assert(is->mutex != NULL);
+	assert(is->cond != NULL);
+
+	g_mutex_lock(is->mutex);
+	input_stream_wait_ready(is);
+	g_mutex_unlock(is->mutex);
+}
+
+bool
+input_stream_cheap_seeking(const struct input_stream *is)
+{
+	return is->seekable && (is->uri == NULL || !uri_has_scheme(is->uri));
+}
+
+bool
+input_stream_seek(struct input_stream *is, goffset offset, int whence,
+		  GError **error_r)
+{
+	assert(is != NULL);
+	assert(is->plugin != NULL);
+
+	if (is->plugin->seek == NULL)
+		return false;
+
+	return is->plugin->seek(is, offset, whence, error_r);
+}
+
+bool
+input_stream_lock_seek(struct input_stream *is, goffset offset, int whence,
+		       GError **error_r)
+{
+	assert(is != NULL);
+	assert(is->plugin != NULL);
+
+	if (is->plugin->seek == NULL)
+		return false;
+
+	if (is->mutex == NULL)
+		/* no locking */
+		return input_stream_seek(is, offset, whence, error_r);
+
+	g_mutex_lock(is->mutex);
+	bool success = input_stream_seek(is, offset, whence, error_r);
+	g_mutex_unlock(is->mutex);
+	return success;
+}
+
+struct tag *
+input_stream_tag(struct input_stream *is)
+{
+	assert(is != NULL);
+	assert(is->plugin != NULL);
+
+	return is->plugin->tag != NULL
+		? is->plugin->tag(is)
+		: NULL;
+}
+
+struct tag *
+input_stream_lock_tag(struct input_stream *is)
+{
+	assert(is != NULL);
+	assert(is->plugin != NULL);
+
+	if (is->plugin->tag == NULL)
+		return nullptr;
+
+	if (is->mutex == NULL)
+		/* no locking */
+		return input_stream_tag(is);
+
+	g_mutex_lock(is->mutex);
+	struct tag *tag = input_stream_tag(is);
+	g_mutex_unlock(is->mutex);
+	return tag;
+}
+
+bool
+input_stream_available(struct input_stream *is)
+{
+	assert(is != NULL);
+	assert(is->plugin != NULL);
+
+	return is->plugin->available != NULL
+		? is->plugin->available(is)
+		: true;
+}
+
+size_t
+input_stream_read(struct input_stream *is, void *ptr, size_t size,
+		  GError **error_r)
+{
+	assert(ptr != NULL);
+	assert(size > 0);
+
+	return is->plugin->read(is, ptr, size, error_r);
+}
+
+size_t
+input_stream_lock_read(struct input_stream *is, void *ptr, size_t size,
+		       GError **error_r)
+{
+	assert(ptr != NULL);
+	assert(size > 0);
+
+	if (is->mutex == NULL)
+		/* no locking */
+		return input_stream_read(is, ptr, size, error_r);
+
+	g_mutex_lock(is->mutex);
+	size_t nbytes = input_stream_read(is, ptr, size, error_r);
+	g_mutex_unlock(is->mutex);
+	return nbytes;
+}
+
+void input_stream_close(struct input_stream *is)
+{
+	is->plugin->close(is);
+}
+
+bool input_stream_eof(struct input_stream *is)
+{
+	return is->plugin->eof(is);
+}
+
+bool
+input_stream_lock_eof(struct input_stream *is)
+{
+	assert(is != NULL);
+	assert(is->plugin != NULL);
+
+	if (is->mutex == NULL)
+		/* no locking */
+		return input_stream_eof(is);
+
+	g_mutex_lock(is->mutex);
+	bool eof = input_stream_eof(is);
+	g_mutex_unlock(is->mutex);
+	return eof;
+}
+