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/*
** CWPOP3CacheManager.m
**
** Copyright (c) 2001-2007 Ludovic Marcotte
** Copyright (C) 2014-2020 Riccardo Mottola
**
** Author: Ludovic Marcotte <ludovic@Sophos.ca>
** Riccardo Mottola <rm@gnu.org>
**
** 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 2.1 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 General Public License
** along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#import <Pantomime/CWPOP3CacheManager.h>
#import <Pantomime/io.h>
#import <Pantomime/CWConstants.h>
#import <Pantomime/CWPOP3CacheObject.h>
#import <Foundation/NSArchiver.h>
#import <Foundation/NSAutoreleasePool.h>
#import <Foundation/NSData.h>
#import <Foundation/NSException.h>
#import <Foundation/NSFileManager.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <netinet/in.h>
static unsigned short version = 1;
//
//
//
@implementation CWPOP3CacheManager
- (id) initWithPath: (NSString *) thePath
{
NSDictionary *attributes;
unsigned short int v;
self = [super initWithPath: thePath];
if (self)
{
_table = NSCreateMapTable(NSObjectMapKeyCallBacks, NSObjectMapValueCallBacks, 128);
_count = 0;
if ((_fd = open([thePath UTF8String], O_RDWR|O_CREAT, S_IRUSR|S_IWUSR)) < 0)
{
NSLog(@"CANNOT CREATE OR OPEN THE CACHE!)");
abort();
}
if (lseek(_fd, 0L, SEEK_SET) < 0)
{
NSLog(@"UNABLE TO LSEEK INITIAL");
abort();
}
attributes = [[NSFileManager defaultManager] fileAttributesAtPath: thePath traverseLink: NO];
// If the cache exists, lets parse it.
if ([[attributes objectForKey: NSFileSize] intValue])
{
NSString *aUID;
NSDate *aDate;
unsigned short len;
char *s;
NSUInteger i;
v = read_uint16(_fd);
// Version mismatch. We ignore the cache for now.
if (v != version)
{
if (ftruncate(_fd, 0) == -1)
{
if (errno == EACCES || errno == EROFS)
NSLog(@"UNABLE TO TRUNCATE CACHE FILE WITH OLD VERSION, NOT WRITABLE");
else
NSLog(@"UNABLE TO TRUNCATE CACHE FILE WITH OLD VERSION");
close(_fd);
abort();
}
[self synchronize];
return self;
}
if(read_uint32(_fd, (uint32_t *)&_count) <= 0)
{
NSLog(@"CWPOP3CacheManager initWithPath: error reading count");
}
//NSLog(@"Init with count = %d version = %d", _count, v);
s = (char *)malloc(4096);
for (i = 0; i < _count; i++)
{
unsigned int dateInt;
read_uint32(_fd, &dateInt);
aDate = [NSCalendarDate dateWithTimeIntervalSince1970: dateInt];
if (read_string(_fd, s, &len) < 0)
{
NSLog(@"CWPOP3CacheManager initWithPath: error reading data (%lu/%lu)", (unsigned long)i, (unsigned long)_count);
break;
}
// FIXME, this could use read_data
aUID = AUTORELEASE([[NSString alloc] initWithData: [NSData dataWithBytes: s length: len]
encoding: NSASCIIStringEncoding]);
NSMapInsert(_table, aUID, aDate);
}
free(s);
}
else
{
[self synchronize];
}
}
return self;
}
//
//
//
- (void) dealloc
{
//NSLog(@"CWPOP3CacheManager: -dealloc, _fd was = %d", _fd);
NSFreeMapTable(_table);
if (_fd >= 0) close(_fd);
[super dealloc];
}
//
//
//
- (NSCalendarDate *) dateForUID: (NSString *) theUID
{
return NSMapGet(_table, theUID);
}
//
//
//
- (BOOL) synchronize
{
if (lseek(_fd, 0L, SEEK_SET) < 0)
{
NSLog(@"fseek failed");
abort();
return NO;
}
// We write our cache version, count and UID validity.
write_uint16(_fd, version);
write_uint32(_fd, _count);
return (fsync(_fd) == 0);
}
//
//
//
- (void) expunge
{
NSLog(@"Warning! POP3 Cache has no expunge implementation");
}
//
//
//
- (void) writeRecord: (cache_record *) theRecord
{
NSData *aData;
// We do NOT write a record we already have in our cache.
// Some POP3 servers, like popa3d, might return the same UID
// for messages at different index but with the same content.
// If that happens, we just don't write that value in our cache.
if (NSMapGet(_table, theRecord->pop3_uid))
{
return;
}
if (lseek(_fd, 0L, SEEK_END) < 0)
{
NSLog(@"COULD NOT LSEEK TO END OF FILE");
abort();
}
write_uint32(_fd, theRecord->date);
aData = [theRecord->pop3_uid dataUsingEncoding: NSASCIIStringEncoding];
write_data(_fd, aData);
NSMapInsert(_table, theRecord->pop3_uid, [NSCalendarDate dateWithTimeIntervalSince1970: theRecord->date]);
_count++;
}
@end
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