1 files changed, 45 insertions, 2 deletions
diff --git a/net/disk_cache/os_file_posix.cc b/net/disk_cache/os_file_posix.cc
index 7b8fe0d..7b1da0b 100644
--- a/net/disk_cache/os_file_posix.cc
+++ b/net/disk_cache/os_file_posix.cc
@@ -4,13 +4,56 @@
 
 #include "net/disk_cache/os_file.h"
 
+#include <fcntl.h>
+
 #include "base/logging.h"
+#include "base/string_util.h"
 
 namespace disk_cache {
 
 OSFile CreateOSFile(const std::wstring& name, int flags, bool* created) {
-  NOTIMPLEMENTED();
-  return 0;
+  int open_flags = 0;
+  if (flags & OS_FILE_CREATE)
+    open_flags = O_CREAT | O_EXCL;
+
+  if (flags & OS_FILE_CREATE_ALWAYS) {
+    DCHECK(!open_flags);
+    open_flags = O_CREAT | O_TRUNC;
+  }
+
+  if (!open_flags && !(flags & OS_FILE_OPEN) &&
+      !(flags & OS_FILE_OPEN_ALWAYS)) {
+    NOTREACHED();
+    return -1;
+  }
+
+  if (flags & OS_FILE_WRITE && flags & OS_FILE_READ) {
+    open_flags |= O_RDWR;
+  } else if (flags & OS_FILE_WRITE) {
+    open_flags |= O_WRONLY;
+  } else if (!(flags & OS_FILE_READ)) {
+    NOTREACHED();
+  }
+
+  DCHECK(O_RDONLY == 0);
+
+  int descriptor = open(WideToUTF8(name).c_str(), open_flags,
+                        S_IRUSR | S_IWUSR);
+
+  if (flags & OS_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 disk_cache