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diff --git a/kmicromail/libetpan/generic/mailthread.h b/kmicromail/libetpan/generic/mailthread.h
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+/*
+ * libEtPan! -- a mail stuff library
+ *
+ * Copyright (C) 2001, 2002 - DINH Viet Hoa
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the libEtPan! project nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * $Id$
+ */
+
+#ifndef MAILTHREAD_H
+
+#define MAILTHREAD_H
+
+#include <libetpan/mailthread_types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+  mail_build_thread constructs a tree with the message using the 
+  given style.
+
+  @param type is the type of threading to apply, the value can be
+    MAIL_THREAD_REFERENCES, MAIL_THREAD_REFERENCES_NO_SUBJECT or
+    MAIL_THREAD_ORDEREDSUBJECT.
+
+  @param default_from is the default charset to use whenever the
+    subject is not tagged with a charset. "US-ASCII" can be used
+    if you don't know what to use.
+
+  @param env_list is the message list (with header fields fetched)
+    to use to build the message tree.
+
+  @param result * result) will contain the resulting message tree.
+
+  @param if comp_func is NULL, no sorting algorithm is used.
+
+  @return MAIL_NO_ERROR is returned on success, MAIL_ERROR_XXX is returned
+    on error
+*/
+
+int mail_build_thread(int type, char * default_from,
+    struct mailmessage_list * env_list,
+    struct mailmessage_tree ** result,
+     int (* comp_func)(struct mailmessage_tree **,
+         struct mailmessage_tree **));
+
+/*
+  mail_thread_sort sort the messages in the message tree, using the
+  given sort function.
+
+  @param tree is the message tree to sort.
+  
+  @param comp_func is the sort function to use (this is the same kind of
+    functions than those used for qsort()). mailthread_tree_timecomp can be
+    used for default sort.
+
+  @param sort_sub if this value is 0, only the children of the root message
+    are sorted.
+*/
+
+int mail_thread_sort(struct mailmessage_tree * tree,
+    int (* comp_func)(struct mailmessage_tree **,
+        struct mailmessage_tree **),
+    int sort_sub);
+
+/*
+  mailthread_tree_timecomp is the default sort function.
+
+  The message are compared by date, then by message numbers.
+  The tree are given in (* ptree1) and (* ptree2).
+*/
+
+int mailthread_tree_timecomp(struct mailmessage_tree ** ptree1,
+    struct mailmessage_tree ** ptree2);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif