1 files changed, 93 insertions, 0 deletions
diff --git a/xpcom/io/Base64.h b/xpcom/io/Base64.h
new file mode 100644
index 0000000000..0a9b3a0305
--- /dev/null
+++ b/xpcom/io/Base64.h
@@ -0,0 +1,93 @@
+/* -*- 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 mozilla_Base64_h__
+#define mozilla_Base64_h__
+
+#include "nsString.h"
+
+class nsIInputStream;
+
+namespace mozilla {
+
+[[nodiscard]] nsresult Base64EncodeInputStream(nsIInputStream* aInputStream,
+                                               nsACString& aDest,
+                                               uint32_t aCount,
+                                               uint32_t aOffset = 0);
+[[nodiscard]] nsresult Base64EncodeInputStream(nsIInputStream* aInputStream,
+                                               nsAString& aDest,
+                                               uint32_t aCount,
+                                               uint32_t aOffset = 0);
+
+// Encode 8-bit data of a given length and append the Base64 encoded data to
+// aBase64.
+[[nodiscard]] nsresult Base64EncodeAppend(const char* aBinary,
+                                          uint32_t aBinaryLen,
+                                          nsAString& aBase64);
+[[nodiscard]] nsresult Base64EncodeAppend(const char* aBinary,
+                                          uint32_t aBinaryLen,
+                                          nsACString& aBase64);
+[[nodiscard]] nsresult Base64EncodeAppend(const nsACString& aBinary,
+                                          nsACString& aBase64);
+[[nodiscard]] nsresult Base64EncodeAppend(const nsACString& aBinary,
+                                          nsAString& aBase64);
+
+[[nodiscard]] nsresult Base64Encode(const char* aBinary, uint32_t aBinaryLen,
+                                    char** aBase64);
+[[nodiscard]] nsresult Base64Encode(const char* aBinary, uint32_t aBinaryLen,
+                                    nsACString& aBase64);
+[[nodiscard]] nsresult Base64Encode(const char* aBinary, uint32_t aBinaryLen,
+                                    nsAString& aBase64);
+[[nodiscard]] nsresult Base64Encode(const nsACString& aBinary,
+                                    nsACString& aBase64);
+[[nodiscard]] nsresult Base64Encode(const nsACString& aBinary,
+                                    nsAString& aBase64);
+
+// The high bits of any characters in aBinary are dropped.
+[[nodiscard]] nsresult Base64Encode(const nsAString& aBinary,
+                                    nsAString& aBase64);
+
+[[nodiscard]] nsresult Base64Decode(const char* aBase64, uint32_t aBase64Len,
+                                    char** aBinary, uint32_t* aBinaryLen);
+[[nodiscard]] nsresult Base64Decode(const nsACString& aBase64,
+                                    nsACString& aBinary);
+
+// The high bits of any characters in aBase64 are dropped.
+[[nodiscard]] nsresult Base64Decode(const nsAString& aBase64,
+                                    nsAString& aBinary);
+[[nodiscard]] nsresult Base64Decode(const nsAString& aBase64,
+                                    nsACString& aBinary);
+
+enum class Base64URLEncodePaddingPolicy {
+  Include,
+  Omit,
+};
+
+/**
+ * Converts |aBinary| to an unpadded, Base64 URL-encoded string per RFC 4648.
+ * Aims to encode the data in constant time. The caller retains ownership
+ * of |aBinary|.
+ */
+[[nodiscard]] nsresult Base64URLEncode(
+    uint32_t aBinaryLen, const uint8_t* aBinary,
+    Base64URLEncodePaddingPolicy aPaddingPolicy, nsACString& aBase64);
+
+enum class Base64URLDecodePaddingPolicy {
+  Require,
+  Ignore,
+  Reject,
+};
+
+/**
+ * Decodes a Base64 URL-encoded |aBase64| into |aBinary|.
+ */
+[[nodiscard]] nsresult Base64URLDecode(
+    const nsACString& aBase64, Base64URLDecodePaddingPolicy aPaddingPolicy,
+    FallibleTArray<uint8_t>& aBinary);
+
+}  // namespace mozilla
+
+#endif