input/curl: move code to IcyInputStream

src/input/IcyInputStream.cxx

@@ -0,0 +1,99 @@
+/*
+ * 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 "IcyInputStream.hxx"
+#include "tag/Tag.hxx"
+
+IcyInputStream::IcyInputStream(InputStream *_input)
+	:ProxyInputStream(_input),
+	 input_tag(nullptr), icy_tag(nullptr),
+	 override_offset(0)
+{
+}
+
+IcyInputStream::~IcyInputStream()
+{
+	delete input_tag;
+	delete icy_tag;
+}
+
+void
+IcyInputStream::Update()
+{
+	ProxyInputStream::Update();
+
+	if (IsEnabled())
+		offset = override_offset;
+}
+
+Tag *
+IcyInputStream::ReadTag()
+{
+	Tag *new_input_tag = ProxyInputStream::ReadTag();
+	if (!IsEnabled())
+		return new_input_tag;
+
+	if (new_input_tag != nullptr) {
+		delete input_tag;
+		input_tag = new_input_tag;
+	}
+
+	Tag *new_icy_tag = parser.ReadTag();
+	if (new_icy_tag != nullptr) {
+		delete icy_tag;
+		icy_tag = new_icy_tag;
+	}
+
+	if (new_input_tag == nullptr && new_icy_tag == nullptr)
+		/* no change */
+		return nullptr;
+
+	if (input_tag == nullptr && icy_tag == nullptr)
+		/* no tag */
+		return nullptr;
+
+	if (input_tag == nullptr)
+		return new Tag(*icy_tag);
+
+	if (icy_tag == nullptr)
+		return new Tag(*input_tag);
+
+	return Tag::Merge(*input_tag, *icy_tag);
+}
+
+size_t
+IcyInputStream::Read(void *ptr, size_t read_size, Error &error)
+{
+	if (!IsEnabled())
+		return ProxyInputStream::Read(ptr, read_size, error);
+
+	while (true) {
+		size_t nbytes = ProxyInputStream::Read(ptr, read_size, error);
+		if (nbytes == 0)
+			return 0;
+
+		size_t result = parser.ParseInPlace(ptr, nbytes);
+		if (result > 0) {
+			override_offset += result;
+			offset = override_offset;
+			return result;
+		}
+	}
+}