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diff --git a/comm/mailnews/mime/src/mimetext.h b/comm/mailnews/mime/src/mimetext.h
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+++ b/comm/mailnews/mime/src/mimetext.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 _MIMETEXT_H_
+#define _MIMETEXT_H_
+
+#include "mimeleaf.h"
+
+/* The MimeInlineText class is the superclass of all handlers for the
+   MIME text/ content types (which convert various text formats to HTML,
+   in one form or another.)
+
+   It provides two services:
+
+     =  if ROT13 decoding is desired, the text will be rotated before
+      the `parse_line' method it called;
+
+   =  text will be converted from the message's charset to the "target"
+        charset before the `parse_line' method is called.
+
+   The contract with charset-conversion is that the converted data will
+   be such that one may interpret any octets (8-bit bytes) in the data
+   which are in the range of the ASCII characters (0-127) as ASCII
+   characters.  It is explicitly legal, for example, to scan through
+   the string for "<" and replace it with "&lt;", and to search for things
+   that look like URLs and to wrap them with interesting HTML tags.
+
+   The charset to which we convert will probably be UTF-8 (an encoding of
+   the Unicode character set, with the feature that all octets with the
+   high bit off have the same interpretations as ASCII.)
+
+   #### NOTE: if it turns out that we use JIS (ISO-2022-JP) as the target
+        encoding, then this is not quite true; it is safe to search for the
+    low ASCII values (under hex 0x40, octal 0100, which is '@') but it
+    is NOT safe to search for values higher than that -- they may be
+    being used as the subsequent bytes in a multi-byte escape sequence.
+    It's a nice coincidence that HTML's critical characters ("<", ">",
+    and "&") have values under 0x40...
+ */
+
+typedef struct MimeInlineTextClass MimeInlineTextClass;
+typedef struct MimeInlineText MimeInlineText;
+
+struct MimeInlineTextClass {
+  MimeLeafClass leaf;
+  int (*rot13_line)(MimeObject* obj, char* line, int32_t length);
+  int (*convert_line_charset)(MimeObject* obj, char* line, int32_t length);
+  int (*initialize_charset)(MimeObject* obj);
+};
+
+extern MimeInlineTextClass mimeInlineTextClass;
+
+#define DAM_MAX_BUFFER_SIZE 8 * 1024
+#define DAM_MAX_LINES 1024
+
+struct MimeInlineText {
+  MimeLeaf leaf; /* superclass variables */
+  char* charset; /* The charset from the content-type of this
+                    object, or the caller-specified overrides
+                    or defaults. */
+  bool charsetOverridable;
+  bool needUpdateMsgWinCharset;
+  char* cbuffer; /* Buffer used for charset conversion. */
+  int32_t cbuffer_size;
+
+  bool inputAutodetect;
+  bool initializeCharset;
+  int32_t lastLineInDam;
+  int32_t curDamOffset;
+  char* lineDamBuffer;
+  char** lineDamPtrs;
+};
+
+#define MimeInlineTextClassInitializer(ITYPE, CSUPER) \
+  { MimeLeafClassInitializer(ITYPE, CSUPER) }
+
+#endif /* _MIMETEXT_H_ */