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+/* vim:set expandtab ts=4 sw=4 sts=4 cin: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsIUnicharOutputStream.idl"
+
+interface nsIOutputStream;
+
+/**
+ * This interface allows writing strings to a stream, doing automatic
+ * character encoding conversion.
+ */
+[scriptable, uuid(4b71113a-cb0d-479f-8ed5-01daeba2e8d4)]
+interface nsIConverterOutputStream : nsIUnicharOutputStream
+{
+ /**
+ * Initialize this stream. Must be called before any other method on this
+ * interface, or you will crash. The output stream passed to this method
+ * must not be null, or you will crash.
+ *
+ * @param aOutStream
+ * The underlying output stream to which the converted strings will
+ * be written.
+ * @param aCharset
+ * The character set to use for encoding the characters. A null
+ * charset will be interpreted as UTF-8.
+ * @param aBufferSize
+ * How many bytes to buffer. A value of 0 means that no bytes will be
+ * buffered. Implementations not supporting buffering may ignore
+ * this parameter.
+ * @param aReplacementCharacter
+ * The replacement character to use when an unsupported character is found.
+ * The character must be encodable in the selected character
+ * encoding; otherwise, attempts to write an unsupported character
+ * will throw NS_ERROR_LOSS_OF_SIGNIFICANT_DATA.
+ *
+ * A value of 0x0000 will cause an exception to be thrown upon
+ * attempts to write unsupported characters.
+ */
+ void init(in nsIOutputStream aOutStream, in string aCharset,
+ in unsigned long aBufferSize,
+ in char16_t aReplacementCharacter);
+};