/usr/include/libgnomeprint-2.2/libgnomeprint/gnome-print-transport.h is in libgnomeprint2.2-dev 2.18.8-3ubuntu1.
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 | /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  gnome-print-transport.h: Abstract base class for transport providers
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library 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 Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  Authors:
 *    Raph Levien (raph@acm.org)
 *    Miguel de Icaza (miguel@kernel.org)
 *    Lauris Kaplinski <lauris@helixcode.com>
 *    Chema Celorio <chema@celorio.com>
 *
 *  Copyright 2000-2003 Ximian, Inc. and authors
 */
#ifndef __GNOME_PRINT_TRANSPORT_H__
#define __GNOME_PRINT_TRANSPORT_H__
#include <glib.h>
#include <libgnomeprint/gnome-print-config.h>
G_BEGIN_DECLS
#define GNOME_TYPE_PRINT_TRANSPORT         (gnome_print_transport_get_type ())
#define GNOME_PRINT_TRANSPORT(o)           (G_TYPE_CHECK_INSTANCE_CAST ((o), GNOME_TYPE_PRINT_TRANSPORT, GnomePrintTransport))
#define GNOME_PRINT_TRANSPORT_CLASS(k)     (G_TYPE_CHECK_CLASS_CAST ((k),    GNOME_TYPE_PRINT_TRANSPORT, GnomePrintTransportClass))
#define GNOME_IS_PRINT_TRANSPORT(o)        (G_TYPE_CHECK_INSTANCE_TYPE ((o), GNOME_TYPE_PRINT_TRANSPORT))
#define GNOME_IS_PRINT_TRANSPORT_CLASS(k)  (G_TYPE_CHECK_CLASS_TYPE ((k),    GNOME_TYPE_PRINT_TRANSPORT))
#define GNOME_PRINT_TRANSPORT_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o),  GNOME_TYPE_PRINT_TRANSPORT, GnomePrintTransportClass))
typedef struct _GnomePrintTransport      GnomePrintTransport;
typedef struct _GnomePrintTransportClass GnomePrintTransportClass;
struct _GnomePrintTransport {
	   GObject object;
	   GnomePrintConfig *config;
	   guint opened : 1;	/* TRUE if it has not been _closed */
	   GError	*err;	/* Contains the first error that can not be handled */
};
struct _GnomePrintTransportClass {
	   GObjectClass parent_class;
	   
	   gint (* construct)  (GnomePrintTransport *transport);
	   gint (* open)       (GnomePrintTransport *transport);
	   gint (* close)      (GnomePrintTransport *transport);
	   gint (* write)      (GnomePrintTransport *transport, const guchar *buf, gint len);
	   gint (* print_file) (GnomePrintTransport *transport, const guchar *file_name);
	/* Run time check to see if the transport makes sense (eg lpr on win32) */
	gboolean (* exists) (GnomePrintTransport const *transport);
	/* Padding for future expansion */
	void (*_gp_reserved0) (void);
	void (*_gp_reserved1) (void);
	void (*_gp_reserved2) (void);
	void (*_gp_reserved3) (void);
};
GType                 gnome_print_transport_get_type (void);
GnomePrintTransport * gnome_print_transport_new (GnomePrintConfig *config);
gboolean	      gnome_print_transport_exists_by_name (const char *name);
gint gnome_print_transport_open      (GnomePrintTransport *transport);
gint gnome_print_transport_close     (GnomePrintTransport *transport);
gint gnome_print_transport_write     (GnomePrintTransport *transport, const guchar *buf, gint len);
gint gnome_print_transport_printf    (GnomePrintTransport *transport, const char *fmt, ...) G_GNUC_PRINTF (2, 3);
gint gnome_print_transport_set_error (GnomePrintTransport *transport, GError *err);
#ifdef GNOME_PRINT_UNSTABLE_API
gint gnome_print_transport_print_file (GnomePrintTransport *transport, const guchar *file_name);
#endif
G_END_DECLS
#endif /*  __GNOME_PRINT_TRANSPORT_H__ */
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