1 files changed, 73 insertions, 0 deletions
diff --git a/lib/chef/win32/error.rb b/lib/chef/win32/error.rb
new file mode 100644
index 0000000000..716ca99d01
--- /dev/null
+++ b/lib/chef/win32/error.rb
@@ -0,0 +1,73 @@
+#
+# Author:: John Keiser (<jkeiser@opscode.com>)
+# Copyright:: Copyright 2011 Opscode, Inc.
+# License:: Apache License, Version 2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+require 'chef/win32/api/error'
+require 'chef/win32/memory'
+require 'chef/win32/unicode'
+require 'chef/exceptions'
+
+class Chef
+  module ReservedNames::Win32
+    class Error
+      include Chef::ReservedNames::Win32::API::Error
+      extend Chef::ReservedNames::Win32::API::Error
+
+      def self.format_message(message_id = 0, args = {})
+        flags = args[:flags] || FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ARGUMENT_ARRAY
+        source = args[:source]
+        language_id = args[:language_id] || 0
+        varargs = args[:varargs] || [:int, 0]
+        buffer = FFI::MemoryPointer.new :pointer
+        num_chars = FormatMessageW(flags | FORMAT_MESSAGE_ALLOCATE_BUFFER, source, message_id, language_id, buffer, 0, *varargs)
+        if num_chars == 0
+          raise!
+        end
+
+        # Extract the string
+        begin
+          return buffer.read_pointer.read_wstring(num_chars)
+        ensure
+          Chef::ReservedNames::Win32::Memory.local_free(buffer.read_pointer)
+        end
+      end
+
+      def self.get_last_error
+        GetLastError()
+      end
+
+      # Raises the last error.  This should only be called by
+      # Win32 API wrapper functions, and then only when wrapped
+      # in an if() statement (since it unconditionally exits)
+      # === Returns
+      # nil::: always returns nil when it does not raise
+      # === Raises
+      # Chef::Exceptions::Win32APIError:::
+      def self.raise!(message = nil)
+        code = get_last_error
+        msg = format_message(code).strip
+        formatted_message = ""
+        formatted_message << message if message
+        formatted_message << "---- Begin Win32 API output ----\n"
+        formatted_message << "System Error Code: #{code}\n"
+        formatted_message << "System Error Message: #{msg}\n"
+        formatted_message << "---- End Win32 API output ----\n"
+        raise Chef::Exceptions::Win32APIError, msg + "\n" + formatted_message
+      end
+    end
+  end
+end