1 files changed, 89 insertions, 0 deletions
diff --git a/xpcom/io/nsStringStream.h b/xpcom/io/nsStringStream.h
new file mode 100644
index 0000000000..8568cc33f8
--- /dev/null
+++ b/xpcom/io/nsStringStream.h
@@ -0,0 +1,89 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "nsString.h"
+#include "nsTArray.h"
+
+/**
+ * Implements:
+ *   nsIStringInputStream
+ *   nsIInputStream
+ *   nsISeekableStream
+ *   nsITellableStream
+ *   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 \
+    }                                                \
+  }
+
+/**
+ * An enumeration type used to represent a method of assignment.
+ */
+enum nsAssignmentType {
+  NS_ASSIGNMENT_COPY,    // copy by value
+  NS_ASSIGNMENT_DEPEND,  // copy by reference
+  NS_ASSIGNMENT_ADOPT    // copy by reference (take ownership of resource)
+};
+
+/**
+ * Factory method to get an nsInputStream from a byte buffer.  Result will
+ * implement nsIStringInputStream, nsITellableStream 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.
+ */
+extern nsresult NS_NewByteInputStream(nsIInputStream** aStreamResult,
+                                      mozilla::Span<const char> aStringToRead,
+                                      nsAssignmentType aAssignment);
+
+/**
+ * Factory method to get an nsIInputStream from an nsTArray representing a byte
+ * buffer.  This will take ownership of the data and empty out the nsTArray.
+ *
+ * Result will implement nsIStringInputStream, nsITellableStream and
+ * nsISeekableStream.
+ */
+extern nsresult NS_NewByteInputStream(nsIInputStream** aStreamResult,
+                                      nsTArray<uint8_t>&& aArray);
+
+/**
+ * Factory method to get an nsIInputStream from an arbitrary StreamBufferSource.
+ * This will take a strong reference to the source.
+ *
+ * Result will implement nsIStringInputStream, nsITellableStream and
+ * nsISeekableStream.
+ */
+extern nsresult NS_NewByteInputStream(nsIInputStream** aStreamResult,
+                                      mozilla::StreamBufferSource* aSource);
+
+/**
+ * Factory method to get an nsInputStream from an nsACString.  Result will
+ * implement nsIStringInputStream, nsTellableStream and nsISeekableStream.
+ */
+extern nsresult NS_NewCStringInputStream(nsIInputStream** aStreamResult,
+                                         const nsACString& aStringToRead);
+extern nsresult NS_NewCStringInputStream(nsIInputStream** aStreamResult,
+                                         nsCString&& aStringToRead);
+
+#endif  // nsStringStream_h__