* Add write and read/write support to FileStream (renamed from FileInputStream).

* Moved net/disk_cache/os_file to base/platform_file.

Review URL: http://codereview.chromium.org/8843

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@4454 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 64 insertions, 0 deletions

diff --git a/base/platform_file_posix.cc b/base/platform_file_posix.cc
new file mode 100644
index 0000000..6aa7aa1
--- /dev/null
+++ b/base/platform_file_posix.cc
@@ -0,0 +1,64 @@
+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/platform_file.h"
+
+#include <fcntl.h>
+#include <errno.h>
+
+#include "base/logging.h"
+#include "base/string_util.h"
+
+namespace base {
+
+// TODO(erikkay): does it make sense to support PLATFORM_FILE_EXCLUSIVE_* here?
+PlatformFile CreatePlatformFile(const std::wstring& name,
+                                int flags,
+                                bool* created) {
+  int open_flags = 0;
+  if (flags & PLATFORM_FILE_CREATE)
+    open_flags = O_CREAT | O_EXCL;
+
+  if (flags & PLATFORM_FILE_CREATE_ALWAYS) {
+    DCHECK(!open_flags);
+    open_flags = O_CREAT | O_TRUNC;
+  }
+
+  if (!open_flags && !(flags & PLATFORM_FILE_OPEN) &&
+      !(flags & PLATFORM_FILE_OPEN_ALWAYS)) {
+    NOTREACHED();
+    errno = ENOTSUP;
+    return INVALID_HANDLE_VALUE;
+  }
+
+  if (flags & PLATFORM_FILE_WRITE && flags & PLATFORM_FILE_READ) {
+    open_flags |= O_RDWR;
+  } else if (flags & PLATFORM_FILE_WRITE) {
+    open_flags |= O_WRONLY;
+  } else if (!(flags & PLATFORM_FILE_READ)) {
+    NOTREACHED();
+  }
+
+  DCHECK(O_RDONLY == 0);
+
+  int descriptor = open(WideToUTF8(name).c_str(), open_flags,
+                        S_IRUSR | S_IWUSR);
+
+  if (flags & PLATFORM_FILE_OPEN_ALWAYS) {
+    if (descriptor > 0) {
+      if (created)
+        *created = false;
+    } else {
+      open_flags |= O_CREAT;
+      descriptor = open(WideToUTF8(name).c_str(), open_flags,
+                        S_IRUSR | S_IWUSR);
+      if (created && descriptor > 0)
+        *created = true;
+    }
+  }
+
+  return descriptor;
+}
+
+}  // namespace base