/usr/include/GNUstep/NGMime/NGMimeHeaderFieldGenerator.h is in libsope-dev 3.2.10-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 | /*
  Copyright (C) 2000-2005 SKYRIX Software AG
  This file is part of SOPE.
  SOPE 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, or (at your option) any
  later version.
  SOPE 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 SOPE; see the file COPYING.  If not, write to the
  Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  02111-1307, USA.
*/
#ifndef __NGMime_NGHeaderFieldGenerator_H__
#define __NGMime_NGHeaderFieldGenerator_H__
#import <Foundation/NSObject.h>
#include <NGMime/NGMimeGeneratorProtocols.h>
@class NSString, NSData, NSMutableDictionary;
@interface NGMimeHeaderFieldGenerator : NSObject <NGMimeHeaderFieldGenerator>
+ (id)headerFieldGenerator;
+ (NSString *)encodeQuotedPrintableWord: (NSString *)word;
+ (NSString *)encodeQuotedPrintableText: (NSString *)text;
- (NSData *)generateDataForHeaderFieldNamed:(NSString *)_headerField
  value:(id)_value;
@end
@interface NGMimeContentTypeHeaderFieldGenerator : NGMimeHeaderFieldGenerator
@end
@interface NGMimeContentLengthHeaderFieldGenerator : NGMimeHeaderFieldGenerator
@end
@interface NGMimeRFC822DateHeaderFieldGenerator : NGMimeHeaderFieldGenerator
@end
@interface NGMimeContentDispositionHeaderFieldGenerator :
                                                     NGMimeHeaderFieldGenerator
@end
@interface NGMimeStringHeaderFieldGenerator : NGMimeHeaderFieldGenerator
@end
@interface NGMimeAddressHeaderFieldGenerator : NGMimeHeaderFieldGenerator
@end
@interface NGMimeHeaderFieldGeneratorSet : NSObject <NGMimeHeaderFieldGenerator>
{
@protected
  NSMutableDictionary            *fieldNameToGenerate;
  id<NGMimeHeaderFieldGenerator> defaultGenerator;
}
+ (id)headerFieldGeneratorSet;
+ (id)defaultRfc822HeaderFieldGeneratorSet;
- (id)init;
- (id)initWithDefaultGenerator:(id<NGMimeHeaderFieldGenerator>)_gen;
/* accessors */
- (void)setGenerator:(id<NGMimeHeaderFieldGenerator>)_gen
  forField:(NSString *)_name;
- (void)setDefaultGenerator:(id<NGMimeHeaderFieldGenerator>)_gen;
- (id<NGMimeHeaderFieldGenerator>)_gen;
/* operation */
- (NSData *)generateDataForHeaderFieldNamed:(NSString *)_headerField
  value:(id)_value;
@end
extern BOOL NGEncodeQuotedPrintableMimeNeeded(const unsigned char *src,
                                              unsigned srcLen);
extern int NGEncodeQuotedPrintableMime(const unsigned char *src, unsigned srcLen,
                                       unsigned char *dest, unsigned destLen);
#endif // __NGMime_NGHeaderFieldGenerator_H__
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