Input*: move to input/

src/input/InputStream.cxx

@@ -0,0 +1,214 @@
+/*
+ * 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 "InputStream.hxx"
+#include "Registry.hxx"
+#include "InputPlugin.hxx"
+#include "plugins/RewindInputPlugin.hxx"
+#include "util/UriUtil.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+
+#include <assert.h>
+#include <stdio.h> /* for SEEK_SET */
+
+static constexpr Domain input_domain("input");
+
+InputStream *
+InputStream::Open(const char *url,
+		  Mutex &mutex, Cond &cond,
+		  Error &error)
+{
+	input_plugins_for_each_enabled(plugin) {
+		InputStream *is;
+
+		is = plugin->open(url, mutex, cond, error);
+		if (is != nullptr) {
+			assert(is->plugin.close != nullptr);
+			assert(is->plugin.read != nullptr);
+			assert(is->plugin.eof != nullptr);
+			assert(!is->seekable || is->plugin.seek != nullptr);
+
+			is = input_rewind_open(is);
+
+			return is;
+		} else if (error.IsDefined())
+			return nullptr;
+	}
+
+	error.Set(input_domain, "Unrecognized URI");
+	return nullptr;
+}
+
+InputStream *
+InputStream::OpenReady(const char *uri,
+		       Mutex &mutex, Cond &cond,
+		       Error &error)
+{
+	InputStream *is = Open(uri, mutex, cond, error);
+	if (is == nullptr)
+		return nullptr;
+
+	mutex.lock();
+	is->WaitReady();
+	bool success = is->Check(error);
+	mutex.unlock();
+
+	if (!success) {
+		is->Close();
+		is = nullptr;
+	}
+
+	return is;
+}
+
+bool
+InputStream::Check(Error &error)
+{
+	return plugin.check == nullptr || plugin.check(this, error);
+}
+
+void
+InputStream::Update()
+{
+	if (plugin.update != nullptr)
+		plugin.update(this);
+}
+
+void
+InputStream::WaitReady()
+{
+	while (true) {
+		Update();
+		if (ready)
+			break;
+
+		cond.wait(mutex);
+	}
+}
+
+void
+InputStream::LockWaitReady()
+{
+	const ScopeLock protect(mutex);
+	WaitReady();
+}
+
+bool
+InputStream::CheapSeeking() const
+{
+	return IsSeekable() && !uri_has_scheme(uri.c_str());
+}
+
+bool
+InputStream::Seek(offset_type _offset, int whence, Error &error)
+{
+	if (plugin.seek == nullptr)
+		return false;
+
+	return plugin.seek(this, _offset, whence, error);
+}
+
+bool
+InputStream::LockSeek(offset_type _offset, int whence, Error &error)
+{
+	if (plugin.seek == nullptr)
+		return false;
+
+	const ScopeLock protect(mutex);
+	return Seek(_offset, whence, error);
+}
+
+bool
+InputStream::Rewind(Error &error)
+{
+	return Seek(0, SEEK_SET, error);
+}
+
+bool
+InputStream::LockRewind(Error &error)
+{
+	return LockSeek(0, SEEK_SET, error);
+}
+
+Tag *
+InputStream::ReadTag()
+{
+	return plugin.tag != nullptr
+		? plugin.tag(this)
+		: nullptr;
+}
+
+Tag *
+InputStream::LockReadTag()
+{
+	if (plugin.tag == nullptr)
+		return nullptr;
+
+	const ScopeLock protect(mutex);
+	return ReadTag();
+}
+
+bool
+InputStream::IsAvailable()
+{
+	return plugin.available != nullptr
+		? plugin.available(this)
+		: true;
+}
+
+size_t
+InputStream::Read(void *ptr, size_t _size, Error &error)
+{
+	assert(ptr != nullptr);
+	assert(_size > 0);
+
+	return plugin.read(this, ptr, _size, error);
+}
+
+size_t
+InputStream::LockRead(void *ptr, size_t _size, Error &error)
+{
+	assert(ptr != nullptr);
+	assert(_size > 0);
+
+	const ScopeLock protect(mutex);
+	return Read(ptr, _size, error);
+}
+
+void
+InputStream::Close()
+{
+	plugin.close(this);
+}
+
+bool
+InputStream::IsEOF()
+{
+	return plugin.eof(this);
+}
+
+bool
+InputStream::LockIsEOF()
+{
+	const ScopeLock protect(mutex);
+	return IsEOF();
+}
+