Implement the mailbox framework for NNTP.

@@ -56,4 +56,8 @@ libmu_nntp_la_SOURCES = \
  nntp_sendline.c \
  nntp_stat.c \
  nntp_stream.c \
- nntp_timeout.c
+ nntp_timeout.c \
+ \
+ url.c \
+ folder.c \
+ mbox.c

+/* GNU Mailutils -- a suite of utilities for electronic mail
+   Copyright (C) 2004 Free Software Foundation, Inc.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#ifdef ENABLE_NNTP
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif
+
+#include <mailutils/nntp.h>
+#include <mailutils/errno.h>
+#include <mailutils/mailbox.h>
+#include <mailutils/registrar.h>
+
+#include <folder0.h>
+#include "nntp0.h"
+
+/* We export url parsing and the initialisation of
+   the mailbox, via the register entry/record.  */
+
+static struct _record _nntp_record =
+{
+  MU_NNTP_URL_SCHEME,
+  _nntp_url_init, /* Url init.  */
+  _nntp_mailbox_init, /* Mailbox init.  */
+  NULL, /* Mailer init.  */
+  _nntp_folder_init, /* Folder init.  */
+  NULL, /* No need for an back pointer.  */
+  NULL, /* _is_scheme method.  */
+  NULL, /* _get_url method.  */
+  NULL, /* _get_mailbox method.  */
+  NULL, /* _get_mailer method.  */
+  NULL  /* _get_folder method.  */
+};
+record_t nntp_record = &_nntp_record;
+
+static int  nntp_folder_open    __P ((folder_t, int));
+static int  nntp_folder_close   __P ((folder_t));
+static void nntp_folder_destroy __P ((folder_t folder));
+static int  nntp_folder_list    __P ((folder_t folder, const char *ref, const char *name, struct folder_list *pflist));
+
+int
+_nntp_folder_init (folder_t folder)
+{
+  int status;
+  f_nntp_t f_nntp;
+
+  f_nntp = folder->data = calloc (1, sizeof (*f_nntp));
+  if (f_nntp == NULL)
+    return ENOMEM;
+
+  f_nntp->folder = folder;
+
+  folder->_destroy = nntp_folder_destroy;
+
+  folder->_open = nntp_folder_open;
+  folder->_close = nntp_folder_close;
+
+  folder->_list = nntp_folder_list;
+  /* Not supported.
+    folder->_lsub = folder_nntp_lsub;
+    folder->_subscribe = folder_nntp_subscribe;
+    folder->_unsubscribe = folder_nntp_unsubscribe;
+    folder->_delete = folder_nntp_delete;
+    folder->_rename = folder_nntp_rename;
+  */
+
+  return 0;
+}
+
+static int
+nntp_folder_open (folder_t folder, int flags)
+{
+  f_nntp_t f_nntp = folder->data;
+  stream_t carrier = NULL;
+  char *host;
+  long port = MU_NNTP_DEFAULT_PORT; /* default nntp port.  */
+  int status = 0;
+  size_t len = 0;
+
+  /* If we are already open for business, noop.  */
+  monitor_wrlock (folder->monitor);
+  if (f_nntp->isopen)
+    {
+      monitor_unlock (folder->monitor);
+      return 0;
+    }
+  monitor_unlock (folder->monitor);
+
+  /* Fetch the server name and the port in the url_t.  */
+  status = url_get_host (folder->url, NULL, 0, &len);
+  if (status != 0)
+    return status;
+  host = alloca (len + 1);
+  url_get_host (folder->url, host, len + 1, NULL);
+  url_get_port (folder->url, &port);
+
+  folder->flags = flags;
+
+  /* Create the networking stack.  */
+  status = tcp_stream_create (&carrier, host, port, folder->flags);
+  if (status != 0)
+    return status;
+  /* Ask for the stream internal buffering mechanism scheme.  */
+  stream_setbufsiz (carrier, BUFSIZ);
+  FOLDER_DEBUG2 (folder, MU_DEBUG_PROT, "folder_nntp_open (%s:%d)\n", host, port);
+
+  status = mu_nntp_create (&f_nntp->nntp);
+  if (status == 0)
+    {
+      status = mu_nntp_set_carrier (f_nntp->nntp, carrier);
+      if (status == 0)
+	{
+	  status = mu_nntp_connect (f_nntp->nntp);
+	  if (status == 0)
+	    {
+	      monitor_wrlock (folder->monitor);
+	      f_nntp->isopen++;
+	      monitor_unlock (folder->monitor);
+	    }
+	}
+    }
+
+  return status;
+}
+
+static int
+nntp_folder_close (folder_t folder)
+{
+  f_nntp_t f_nntp = folder->data;
+  int status = 0;
+
+  monitor_wrlock (folder->monitor);
+  f_nntp->isopen--;
+  if (f_nntp->isopen)
+    {
+      monitor_unlock (folder->monitor);
+      return 0;
+    }
+  monitor_unlock (folder->monitor);
+  status = mu_nntp_quit (f_nntp->nntp);
+  f_nntp->selected = NULL;
+  return status;
+
+}
+
+/* Destroy the folder resources.  */
+static void
+nntp_folder_destroy (folder_t folder)
+{
+  if (folder->data)
+    {
+      f_nntp_t f_nntp = folder->data;
+      if (f_nntp->nntp)
+        mu_nntp_destroy (&f_nntp->nntp);
+      free (f_nntp);
+      folder->data = NULL;
+    }
+}
+
+
+static int
+nntp_folder_list (folder_t folder, const char *ref, const char *name, struct folder_list *pflist)
+{
+  return ENOTSUP;
+}
+#else
+#include <stdio.h>
+#include <registrar0.h>
+record_t nntp_record = NULL;
+#endif

+/* GNU Mailutils -- a suite of utilities for electronic mail
+   Copyright (C) 2004 Free Software Foundation, Inc.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+struct _nntp_folder;
+struct _nntp_mailbox;
+struct _nntp_message;
+typedef struct _nntp_folder *f_nntp_t;
+typedef struct _nntp_mailbox *m_nntp_t;
+typedef struct _nntp_message *msg_nntp_t;
+
+extern int _nntp_url_init          __P ((url_t));
+extern int _nntp_mailbox_init      __P ((mailbox_t));
+extern int _nntp_folder_init       __P ((folder_t));
+
+struct _nntp_folder
+{
+  /* Refcount.  */
+  int isopen;
+
+  /* Back pointer.  */
+  folder_t folder;
+
+  /* Selected newsgroup.  */
+  m_nntp_t selected;
+
+  /* NNTP object.  */
+  mu_nntp_t nntp;
+};
+
+struct _nntp_mailbox
+{
+  char status;
+
+  char *name;
+
+  /* Pointer back to the mailbox/newsgroup. */
+  mailbox_t mailbox;
+
+  /* Our nntp folder.  */
+  f_nntp_t f_nntp;
+
+  /* Read Messages on the newsgroup.  */
+  msg_nntp_t *messages;
+  size_t messages_count;
+
+  /* Estimated number of articles in the group.  */
+  unsigned long number;
+  /* High water mark from "GROUP" command  */
+  unsigned long high;
+  /* Low water mark from "GROUP" command  */
+  unsigned long low;
+};
+
+struct _nntp_message
+{
+  /* Back pointer.  */
+  message_t message;
+
+  /* Our nntp folder.  */
+  m_nntp_t m_nntp;
+
+  /*  Message id.  */
+  char *mid;
+
+  /* mesgno of the post.  */
+  unsigned long msgno;
+
+  /* Stream for message.  */
+  stream_t mstream;
+  /* Stream for body.  */
+  stream_t bstream;
+  /* Stream for header.  */
+  stream_t hstream;
+};

+/* GNU Mailutils -- a suite of utilities for electronic mail
+   Copyright (C) 2004 Free Software Foundation, Inc.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#ifdef ENABLE_NNTP
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif
+
+#include <mailutils/nntp.h>
+
+#include <url0.h>
+
+static void url_nntp_destroy (url_t url);
+
+static void
+url_nntp_destroy (url_t url ARG_UNUSED)
+{
+}
+
+/*
+  POP URL:
+  nntp://<host>:<port>/<newsgroup-name>/<article-number>
+*/
+
+int
+_nntp_url_init (url_t url)
+{
+  int status = 0;
+
+  url->_destroy = url_nntp_destroy;
+
+  status = url_parse(url);
+
+  if(status)
+    return status;
+
+  /* is it nntp? */
+  if (strcmp (MU_NNTP_URL_SCHEME, url->scheme) != 0)
+    return EINVAL;
+
+  /* not valid in a nntp url */
+  if (!url->host || !url->path)
+    return EINVAL;
+
+  if (url->port == 0)
+    url->port = MU_NNTP_DEFAULT_PORT;
+
+  return status;
+}
+
+#endif