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-rw-r--r--src/fs/io/BufferedOutputStream.cxx143
1 files changed, 143 insertions, 0 deletions
diff --git a/src/fs/io/BufferedOutputStream.cxx b/src/fs/io/BufferedOutputStream.cxx
new file mode 100644
index 000000000..088a3e279
--- /dev/null
+++ b/src/fs/io/BufferedOutputStream.cxx
@@ -0,0 +1,143 @@
+/*
+ * 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 "BufferedOutputStream.hxx"
+#include "OutputStream.hxx"
+
+#include <stdarg.h>
+#include <string.h>
+#include <stdio.h>
+
+bool
+BufferedOutputStream::AppendToBuffer(const void *data, size_t size)
+{
+ auto r = buffer.Write();
+ if (r.size < size)
+ return false;
+
+ memcpy(r.data, data, size);
+ buffer.Append(size);
+ return true;
+}
+
+bool
+BufferedOutputStream::Write(const void *data, size_t size)
+{
+ if (gcc_unlikely(last_error.IsDefined()))
+ return false;
+
+ if (AppendToBuffer(data, size))
+ return true;
+
+ if (!Flush())
+ return false;
+
+ if (AppendToBuffer(data, size))
+ return true;
+
+ return os.Write(data, size, last_error);
+}
+
+bool
+BufferedOutputStream::Write(const char *p)
+{
+ return Write(p, strlen(p));
+}
+
+bool
+BufferedOutputStream::Format(const char *fmt, ...)
+{
+ if (gcc_unlikely(last_error.IsDefined()))
+ return false;
+
+ auto r = buffer.Write();
+ if (r.IsEmpty()) {
+ if (!Flush())
+ return false;
+
+ r = buffer.Write();
+ }
+
+ /* format into the buffer */
+ va_list ap;
+ va_start(ap, fmt);
+ size_t size = vsnprintf(r.data, r.size, fmt, ap);
+ va_end(ap);
+
+ if (gcc_unlikely(size >= r.size)) {
+ /* buffer was not large enough; flush it and try
+ again */
+
+ if (!Flush())
+ return false;
+
+ r = buffer.Write();
+
+ if (gcc_unlikely(size >= r.size)) {
+ /* still not enough space: grow the buffer and
+ try again */
+ r.size = size + 1;
+ r.data = buffer.Write(r.size);
+ }
+
+ /* format into the new buffer */
+ va_start(ap, fmt);
+ size = vsnprintf(r.data, r.size, fmt, ap);
+ va_end(ap);
+
+ /* this time, it must fit */
+ assert(size < r.size);
+ }
+
+ buffer.Append(size);
+ return true;
+}
+
+bool
+BufferedOutputStream::Flush()
+{
+ if (!Check())
+ return false;
+
+ auto r = buffer.Read();
+ if (r.IsEmpty())
+ return true;
+
+ bool success = os.Write(r.data, r.size, last_error);
+ if (gcc_likely(success))
+ buffer.Consume(r.size);
+ return success;
+}
+
+bool
+BufferedOutputStream::Flush(Error &error)
+{
+ if (!Check(error))
+ return false;
+
+ auto r = buffer.Read();
+ if (r.IsEmpty())
+ return true;
+
+ bool success = os.Write(r.data, r.size, error);
+ if (gcc_likely(success))
+ buffer.Consume(r.size);
+ return success;
+}