From 0d0ccacdf3e154b1cc27a0840fce80ac13f9641c Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Wed, 30 Jul 2014 19:10:28 +0200
Subject: fs/OutputStream: new infrastructure for writing to files

---
 src/fs/output/FileOutputStream.cxx | 134 +++++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 src/fs/output/FileOutputStream.cxx

(limited to 'src/fs/output/FileOutputStream.cxx')

diff --git a/src/fs/output/FileOutputStream.cxx b/src/fs/output/FileOutputStream.cxx
new file mode 100644
index 000000000..68c46acee
--- /dev/null
+++ b/src/fs/output/FileOutputStream.cxx
@@ -0,0 +1,134 @@
+/*
+ * 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 "FileOutputStream.hxx"
+#include "fs/FileSystem.hxx"
+#include "util/Error.hxx"
+
+#ifdef WIN32
+
+FileOutputStream::FileOutputStream(Path _path, Error &error)
+	:path(_path),
+	 handle(CreateFile(path.c_str(), GENERIC_WRITE, 0, nullptr,
+			   TRUNCATE_EXISTING,
+			   FILE_ATTRIBUTE_NORMAL|FILE_FLAG_WRITE_THROUGH,
+			   nullptr))
+{
+	if (handle == INVALID_HANDLE_VALUE)
+		error.FormatLastError("Failed to create %s", path.c_str());
+}
+
+bool
+FileOutputStream::Write(const void *data, size_t size, Error &error)
+{
+	assert(IsDefined());
+
+	DWORD nbytes;
+	if (!WriteFile(handle, data, size, &nbytes, nullptr)) {
+		error.FormatLastError("Failed to write to %s", path.c_str());
+		return false;
+	}
+
+	if (size_t(nbytes) != size) {
+		error.FormatLastError(ERROR_DISK_FULL,
+				      "Failed to write to %s", path.c_str());
+		return false;
+	}
+
+	return true;
+}
+
+bool
+FileOutputStream::Commit(gcc_unused Error &error)
+{
+	assert(IsDefined());
+
+	CloseHandle(handle);
+	return true;
+}
+
+void
+FileOutputStream::Cancel()
+{
+	assert(IsDefined());
+
+	CloseHandle(handle);
+	RemoveFile(path);
+}
+
+#else
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+
+FileOutputStream::FileOutputStream(Path _path, Error &error)
+	:path(_path),
+	 fd(open(path.c_str(),
+		 O_WRONLY|O_CLOEXEC|O_CREAT|O_TRUNC|O_NOCTTY,
+		 0666))
+{
+	if (fd < 0)
+		error.FormatErrno("Failed to create %s", path.c_str());
+}
+
+bool
+FileOutputStream::Write(const void *data, size_t size, Error &error)
+{
+	assert(IsDefined());
+
+	ssize_t nbytes = write(fd, data, size);
+	if (nbytes < 0) {
+		error.FormatErrno("Failed to write to %s", path.c_str());
+		return false;
+	} else if ((size_t)nbytes < size) {
+		error.FormatErrno(ENOSPC,
+				  "Failed to write to %s", path.c_str());
+		return false;
+	}
+
+	return true;
+}
+
+bool
+FileOutputStream::Commit(Error &error)
+{
+	assert(IsDefined());
+
+	bool success = close(fd) == 0;
+	fd = -1;
+	if (!success)
+		error.FormatErrno("Failed to commit %s", path.c_str());
+
+	return success;
+}
+
+void
+FileOutputStream::Cancel()
+{
+	assert(IsDefined());
+
+	close(fd);
+	fd = -1;
+
+	RemoveFile(path);
+}
+
+#endif
-- 
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