added library for parsing icy-metadata

The icy_metadata will be used by the curl input_stream implementation.

1 files changed, 98 insertions, 0 deletions

diff --git a/src/icy_metadata.h b/src/icy_metadata.h
new file mode 100644
index 000000000..fd2c7bbc0
--- /dev/null
+++ b/src/icy_metadata.h
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2003-2008 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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