diff -r 000000000000 -r 6474c204b198 xpcom/io/nsStringStream.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/io/nsStringStream.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,74 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef nsStringStream_h__
+#define nsStringStream_h__
+
+#include "nsIStringStream.h"
+#include "nsStringGlue.h"
+#include "nsMemory.h"
+
+/**
+ * Implements:
+ *   nsIStringInputStream
+ *   nsIInputStream
+ *   nsISeekableStream
+ *   nsISupportsCString
+ */
+#define NS_STRINGINPUTSTREAM_CONTRACTID "@mozilla.org/io/string-input-stream;1"
+#define NS_STRINGINPUTSTREAM_CID                     \
+{ /* 0abb0835-5000-4790-af28-61b3ba17c295 */         \
+    0x0abb0835,                                      \
+    0x5000,                                          \
+    0x4790,                                          \
+    {0xaf, 0x28, 0x61, 0xb3, 0xba, 0x17, 0xc2, 0x95} \
+}
+
+/**
+ * Factory method to get an nsInputStream from a byte buffer.  Result will
+ * implement nsIStringInputStream and nsISeekableStream.
+ *
+ * If aAssignment is NS_ASSIGNMENT_COPY, then the resulting stream holds a copy
+ * of the given buffer (aStringToRead), and the caller is free to discard
+ * aStringToRead after this function returns.
+ *
+ * If aAssignment is NS_ASSIGNMENT_DEPEND, then the resulting stream refers
+ * directly to the given buffer (aStringToRead), so the caller must ensure that
+ * the buffer remains valid for the lifetime of the stream object.  Use with
+ * care!!
+ *
+ * If aAssignment is NS_ASSIGNMENT_ADOPT, then the resulting stream refers
+ * directly to the given buffer (aStringToRead) and will free aStringToRead
+ * once the stream is closed.
+ *
+ * If aLength is less than zero, then the length of aStringToRead will be
+ * determined by scanning the buffer for the first null byte.
+ */
+extern nsresult
+NS_NewByteInputStream(nsIInputStream** aStreamResult,
+                      const char* aStringToRead, int32_t aLength = -1,
+                      nsAssignmentType aAssignment = NS_ASSIGNMENT_DEPEND);
+
+/**
+ * Factory method to get an nsInputStream from an nsAString.  Result will
+ * implement nsIStringInputStream and nsISeekableStream.
+ *
+ * The given string data will be converted to a single-byte data buffer via
+ * truncation (i.e., the high-order byte of each character will be discarded).
+ * This could result in data-loss, so be careful when using this function.
+ */
+extern nsresult
+NS_NewStringInputStream(nsIInputStream** aStreamResult,
+                        const nsAString& aStringToRead);
+
+/**
+ * Factory method to get an nsInputStream from an nsACString.  Result will
+ * implement nsIStringInputStream and nsISeekableStream.
+ */
+extern nsresult
+NS_NewCStringInputStream(nsIInputStream** aStreamResult,
+                         const nsACString& aStringToRead);
+
+#endif // nsStringStream_h__