A bunch of new funcs to handle x-evolution private header field.

2000-01-17  bertrand  <bertrand@helixcode.com>

	* camel/providers/mbox/camel-mbox-utils.c (camel_mbox_write_xev):
	(copy_file_chunk):
	(camel_mbox_xev_write_header_content):
	(camel_mbox_xev_parse_header_content):
	(string_to_flag):
	(flag_to_string):
	(string_to_uid):
	(uid_to_string):
	A bunch of new funcs to handle x-evolution
	private header field.

Various others modifications and fixes.

svn path=/trunk/; revision=1576

1 files changed, 313 insertions, 0 deletions

diff --git a/camel/providers/mbox/camel-mbox-utils.c b/camel/providers/mbox/camel-mbox-utils.c
new file mode 100644
index 0000000000..9eb4bd1f0d
--- /dev/null
+++ b/camel/providers/mbox/camel-mbox-utils.c
@@ -0,0 +1,313 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+/* Various utilities for the mbox provider */
+
+/* 
+ * Authors : 
+ *   Bertrand Guiheneuf <bertrand@helixcode.com>
+ *
+ * Copyright (C) 1999 Helix Code.
+ *
+ * This program is free software; you can redistribute it and/or 
+ * modify it under the terms of the GNU General Public License as 
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ */
+
+
+/* "xev" stands for x-evolution, which is the name of the
+ * evolution specific header where are stored informations
+ * like : 
+ *   - mail status 
+ *   - mail uid 
+ *  ...
+ *
+ *
+ * The evolution line ha10s the following format :
+ *
+ *   X-Evolution:XXXXX-X
+ *               \___/ \/
+ *          UID ---'    `- Status 
+ * 
+ * the UID is internally used as a 32 bits long integer, but only the first 24 bits are 
+ * used. The UID is coded as a string on 4 characters. Each character is a 6 bits 
+ * integer coded using the b64 alphabet. 
+ *
+ */
+
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+
+
+#include <glib.h>
+#include "camel-mbox-utils.h"
+#include "camel-mbox-parser.h"
+
+
+
+static gchar b64_alphabet[64] = 
+"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+
+
+static void 
+uid_to_string (guint32 uid, gchar string[4])
+{
+	
+	string [0] = b64_alphabet [(uid >> 18) & 0x3f];
+	string [1] = b64_alphabet [(uid >> 12) & 0x3f];
+	string [2] = b64_alphabet [(uid >>  6) & 0x3f];
+	string [3] = b64_alphabet [(uid      ) & 0x3f];
+}
+
+
+static guint32
+string_to_uid (gchar *string)
+{
+	guint32 i;
+	
+	i = 
+		(((string [0] >= 97) ? ( string [0] - 71 ) :
+		 ((string [0] >= 65) ? ( string [0] - 65 ) :
+		  ((string [0] >= 48) ? ( string [0] + 4 ) :
+		   ((string [0] == 43) ? 62 : 63 )))) << 18)		
+		
+		+ (((string [1] >= 97) ? ( string [1] - 71 ) :
+		   ((string [1] >= 65) ? ( string [1] - 65 ) :
+		    ((string [1] >= 48) ? ( string [1] + 4 ) :
+		     ((string [1] == 43) ? 62 : 63 )))) << 12)
+		
+		
+		+ ((((string [2] >= 97) ? ( string [2] - 71 ) :
+		   ((string [2] >= 65) ? ( string [2] - 65 ) :
+		    ((string [2] >= 48) ? ( string [2] + 4 ) :
+		     ((string [2] == 43) ? 62 : 63 ))))) << 6)
+		
+		
+		+ (((string [3] >= 97) ? ( string [3] - 71 ) :
+		   ((string [3] >= 65) ? ( string [3] - 65 ) :
+		    ((string [3] >= 48) ? ( string [3] + 4 ) :
+		     ((string [3] == 43) ? 62 : 63 )))));
+	
+	return i;
+	
+}
+
+
+static gchar
+flag_to_string (guchar status)
+{
+	return b64_alphabet [status & 0x3f];
+}
+
+
+static guchar
+string_to_flag (gchar string)
+{	
+	return (string >= 97) ? ( string - 71 ) :
+		((string >= 65) ? ( string - 65 ) :
+		 ((string >= 48) ? ( string + 4 ) :
+		  ((string == 43) ? 62 : 63 )));
+}
+
+
+
+
+
+void 
+camel_mbox_xev_parse_header_content (gchar header_content[6], 
+				     guint32 *uid, 
+				     guchar status)
+{
+	
+	/* we assume that the first 4 characters of the header content 
+	   are actually the uid stuff. If somebody messed with it ...
+	   toooo bad. 
+	*/
+	*uid = string_to_uid (header_content);
+	status = string_to_flag (header_content[5]);
+}
+
+void 
+camel_mbox_xev_write_header_content (gchar header_content[6], 
+				     guint32 uid, 
+				     guchar status)
+{
+	uid_to_string (uid, header_content);
+	header_content[5] = flag_to_string (status);
+	header_content[4] = '-';
+}
+
+
+
+
+
+
+static void 
+copy_file_chunk (gint fd_src,
+		 gint fd_dest, 
+		 glong nb_bytes, 
+		 CamelException *ex)
+{
+	gchar buffer [1000];
+	glong nb_to_read;
+	glong nb_read, v;
+	
+	
+	nb_to_read = nb_bytes;
+	while (nb_to_read > 0) {
+		
+		do {
+			nb_read = read (fd_src, buffer, MAX (1000, nb_to_read));
+		} while (nb_read == -1 && errno == EINTR);
+		
+		if (nb_read == -1) {
+			camel_exception_set (ex, 
+					     CAMEL_EXCEPTION_FOLDER_INSUFFICIENT_PERMISSION,
+					     "could read from the mbox file");
+			return;
+		}
+
+
+		nb_to_read -= nb_read;
+
+		do {
+			v = write (fd_dest, buffer, nb_read);
+		} while (v == -1 && errno == EINTR);
+
+		if (v == -1) {
+			camel_exception_set (ex, 
+					     CAMEL_EXCEPTION_FOLDER_INSUFFICIENT_PERMISSION,
+					     "could write to the mbox copy file");
+			return;
+		}
+
+		
+	}
+	
+	
+	
+}
+
+
+glong
+camel_mbox_write_xev (gchar *mbox_file_name,
+		      GArray *summary_information, 
+		      glong  next_uid, 
+		      CamelException *ex)
+{
+	gint cur_msg;
+	CamelMboxParserMessageInfo *cur_msg_info;
+	gint fd1, fd2;
+	guint bytes_to_copy = 0;
+	glong next_free_uid;
+	gchar xev_header[20] = "X-Evolution:XXXX-X\n";
+	gchar *tmp_file_name;
+	gchar *tmp_file_name_secure;
+	gint rename_result;
+	gint unlink_result;
+	
+	tmp_file_name = g_strdup_printf ("__%s__.ev_tmp", mbox_file_name);
+	tmp_file_name_secure = g_strdup_printf ("__%s__.ev_tmp_secure", mbox_file_name);
+
+	fd1 = open (mbox_file_name, O_RDONLY);
+	fd2 = open (tmp_file_name, O_RDWR);
+	
+	next_free_uid = next_uid;
+	for (cur_msg = 0; cur_msg < summary_information->len; cur_msg++) {
+		
+		cur_msg_info = (CamelMboxParserMessageInfo *)(summary_information->data) + cur_msg;
+		if (cur_msg_info->x_evolution) {
+
+			bytes_to_copy += cur_msg_info->size;
+		} else {
+			
+			bytes_to_copy += cur_msg_info->end_of_headers_offset;
+			copy_file_chunk (fd1, fd2, bytes_to_copy, ex);
+			if (camel_exception_get_id (ex)) {
+				close (fd1);
+				close (fd2);
+				goto end;
+			}
+
+			camel_mbox_xev_write_header_content (xev_header + 12, next_free_uid++, 0);
+			write (fd2, xev_header, 19);
+			bytes_to_copy = cur_msg_info->size - cur_msg_info->end_of_headers_offset;
+			cur_msg_info->size += 19;
+			cur_msg_info->x_evolution_offset = cur_msg_info->end_of_headers_offset;
+			cur_msg_info->x_evolution = g_strdup_printf ("%.6s", xev_header + 12);
+			cur_msg_info->end_of_headers_offset += 19;
+		}
+	}
+
+	if (bytes_to_copy > 0)
+		copy_file_chunk (fd1, fd2, bytes_to_copy, ex);
+
+
+	/* close the original file as well as the 
+	   newly created one */
+	close (fd1);
+	close (fd2);
+	
+
+
+	/* replace the mbox file with the temporary
+	   file we just created */ 
+
+	/* first rename the old mbox file to a temporary file */
+	rename_result = rename (mbox_file_name, tmp_file_name_secure);
+	if (rename_result == -1) {
+		camel_exception_set (ex, 
+				     CAMEL_EXCEPTION_FOLDER_INSUFFICIENT_PERMISSION,
+				     "could not rename the mbox file to a temporary file");
+		goto end;
+	}
+	
+	/* then rename the newly created mbox file to the name 
+	   of the original one */
+	rename_result = rename (tmp_file_name, mbox_file_name);
+	if (rename_result == -1) {
+		camel_exception_set (ex, 
+				     CAMEL_EXCEPTION_FOLDER_INSUFFICIENT_PERMISSION,
+				     "could not rename the X-Evolution fed file to the mbox file");
+		goto end;
+	}
+
+	/* finally, remove the old renamed mbox file */
+	unlink_result = unlink (tmp_file_name_secure);
+	if (unlink_result == -1) {
+		camel_exception_set (ex, 
+				     CAMEL_EXCEPTION_FOLDER_INSUFFICIENT_PERMISSION,
+				     "could not remove the saved original mbox file");
+		goto end;
+	}
+
+
+ end: /* free everything and return */
+	
+	g_free (tmp_file_name);
+	g_free (tmp_file_name_secure);
+	return next_free_uid;
+}
+
+
+
+
+
+
+
+