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diff --git a/comm/mailnews/mime/src/mimeleaf.h b/comm/mailnews/mime/src/mimeleaf.h
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+++ b/comm/mailnews/mime/src/mimeleaf.h
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+/* -*- Mode: C; tab-width: 4; 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 _MIMELEAF_H_
+#define _MIMELEAF_H_
+
+#include "mimeobj.h"
+#include "modmimee.h"
+
+/* MimeLeaf is the class for the objects representing all MIME types which
+   are not containers for other MIME objects.  The implication of this is
+   that they are MIME types which can have Content-Transfer-Encodings
+   applied to their data.  This class provides that service in its
+   parse_buffer() method:
+
+     int (*parse_decoded_buffer) (const char *buf, int32_t size, MimeObject
+   *obj)
+
+   The `parse_buffer' method of MimeLeaf passes each block of data through
+   the appropriate decoder (if any) and then calls `parse_decoded_buffer'
+   on each block (not line) of output.
+
+   The default `parse_decoded_buffer' method of MimeLeaf line-buffers the
+   now-decoded data, handing each line to the `parse_line' method in turn.
+   If different behavior is desired (for example, if a class wants access
+   to the decoded data before it is line-buffered) the `parse_decoded_buffer'
+   method should be overridden.  (MimeExternalObject does this.)
+ */
+
+typedef struct MimeLeafClass MimeLeafClass;
+typedef struct MimeLeaf MimeLeaf;
+
+struct MimeLeafClass {
+  MimeObjectClass object;
+  /* This is the callback that is handed to the decoder. */
+  int (*parse_decoded_buffer)(const char* buf, int32_t size, MimeObject* obj);
+  int (*close_decoder)(MimeObject* obj);
+};
+
+extern MimeLeafClass mimeLeafClass;
+
+struct MimeLeaf {
+  MimeObject object; /* superclass variables */
+
+  /* If we're doing Base64, Quoted-Printable, or UU decoding, this is the
+   state object for the decoder. */
+  MimeDecoderData* decoder_data;
+
+  /* We want to count the size of the MimeObject to offer consumers the
+   * opportunity to display the sizes of attachments.
+   */
+  int sizeSoFar;
+};
+
+#define MimeLeafClassInitializer(ITYPE, CSUPER) \
+  { MimeObjectClassInitializer(ITYPE, CSUPER) }
+
+#endif /* _MIMELEAF_H_ */