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diff --git a/net/base/wininet_util.cc b/net/base/wininet_util.cc
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "net/base/wininet_util.h"
+
+#include "base/logging.h"
+#include "net/base/net_errors.h"
+
+namespace net {
+
+// static
+int WinInetUtil::OSErrorToNetError(DWORD os_error) {
+  // Optimize the common case.
+  if (os_error == ERROR_IO_PENDING)
+    return net::ERR_IO_PENDING;
+
+  switch (os_error) {
+    case ERROR_SUCCESS:
+      return net::OK;
+    case ERROR_FILE_NOT_FOUND:
+    case ERROR_PATH_NOT_FOUND:
+      return net::ERR_FILE_NOT_FOUND;
+    case ERROR_HANDLE_EOF:  // TODO(wtc): return net::OK?
+      return net::ERR_CONNECTION_CLOSED;
+    case ERROR_INVALID_HANDLE:
+      return net::ERR_INVALID_HANDLE;
+    case ERROR_INVALID_PARAMETER:
+      return net::ERR_INVALID_ARGUMENT;
+
+    case ERROR_INTERNET_CANNOT_CONNECT:
+      return net::ERR_CONNECTION_FAILED;
+    case ERROR_INTERNET_CONNECTION_RESET:
+      return net::ERR_CONNECTION_RESET;
+    case ERROR_INTERNET_DISCONNECTED:
+      return net::ERR_INTERNET_DISCONNECTED;
+    case ERROR_INTERNET_INVALID_URL:
+      return net::ERR_INVALID_URL;
+    case ERROR_INTERNET_NAME_NOT_RESOLVED:
+      return net::ERR_NAME_NOT_RESOLVED;
+    case ERROR_INTERNET_OPERATION_CANCELLED:
+      return net::ERR_ABORTED;
+    case ERROR_INTERNET_UNRECOGNIZED_SCHEME:
+      return net::ERR_UNKNOWN_URL_SCHEME;
+
+    // SSL certificate errors
+    case ERROR_INTERNET_SEC_CERT_CN_INVALID:
+      return net::ERR_CERT_COMMON_NAME_INVALID;
+    case ERROR_INTERNET_SEC_CERT_DATE_INVALID:
+      return net::ERR_CERT_DATE_INVALID;
+    case ERROR_INTERNET_INVALID_CA:
+      return net::ERR_CERT_AUTHORITY_INVALID;
+    case ERROR_INTERNET_SEC_CERT_NO_REV:
+      return net::ERR_CERT_NO_REVOCATION_MECHANISM;
+    case ERROR_INTERNET_SEC_CERT_REV_FAILED:
+      return net::ERR_CERT_UNABLE_TO_CHECK_REVOCATION;
+    case ERROR_INTERNET_SEC_CERT_REVOKED:
+      return net::ERR_CERT_REVOKED;
+    case ERROR_INTERNET_SEC_CERT_ERRORS:
+      return net::ERR_CERT_CONTAINS_ERRORS;
+    case ERROR_INTERNET_SEC_INVALID_CERT:
+      return net::ERR_CERT_INVALID;
+
+    case ERROR_INTERNET_EXTENDED_ERROR:
+    default:
+      return net::ERR_FAILED;
+  }
+}
+
+}  // namespace net