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/* A byte source/sink .. it can be a pipe, file descriptor, memory area,
* socket, node.js stream, etc.
*
* J.Cupitt, 19/6/14
*/
/*
This file is part of VIPS.
VIPS 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 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
/*
#define VIPS_DEBUG
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /*HAVE_UNISTD_H*/
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <vips/vips.h>
#include <vips/internal.h>
#include <vips/debug.h>
/**
* VipsConnection:
*
* An abstract base class representing a source or sink of bytes.
*
* It can be connected to a network socket, for example, or perhaps
* a Node.js stream, or to an area of memory. This allows it to support
* operations like JPEG loading, see for example [ctor@Image.jpegload_source].
*
* Subclass to add other input sources. Use [class@SourceCustom] and
* [class@TargetCustom] to make a source or target with action signals.
* These classes provide action signals such as:
*
* - [signal@SourceCustom::read] for reading data from a custom source.
* - [signal@SourceCustom::seek] for seeking within a data stream.
* - [signal@TargetCustom::write] for writing data to a custom target.
*/
G_DEFINE_ABSTRACT_TYPE(VipsConnection, vips_connection, VIPS_TYPE_OBJECT);
static void
vips_connection_finalize(GObject *gobject)
{
VipsConnection *connection = (VipsConnection *) gobject;
#ifdef VIPS_DEBUG
VIPS_DEBUG_MSG("vips_connection_finalize: ");
vips_object_print_name(VIPS_OBJECT(gobject));
VIPS_DEBUG_MSG("\n");
#endif /*VIPS_DEBUG*/
if (connection->tracked_descriptor >= 0) {
VIPS_DEBUG_MSG(" tracked_close()\n");
vips_tracked_close(connection->tracked_descriptor);
connection->tracked_descriptor = -1;
connection->descriptor = -1;
}
if (connection->close_descriptor >= 0) {
VIPS_DEBUG_MSG(" close()\n");
close(connection->close_descriptor);
connection->close_descriptor = -1;
connection->descriptor = -1;
}
VIPS_FREE(connection->filename);
G_OBJECT_CLASS(vips_connection_parent_class)->finalize(gobject);
}
static void
vips_connection_class_init(VipsConnectionClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS(class);
gobject_class->finalize = vips_connection_finalize;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
VIPS_ARG_INT(class, "descriptor", 1,
_("Descriptor"),
_("File descriptor for read or write"),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET(VipsConnection, descriptor),
-1, 1000000000, 0);
VIPS_ARG_STRING(class, "filename", 2,
_("Filename"),
_("Name of file to open"),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET(VipsConnection, filename),
NULL);
}
static void
vips_connection_init(VipsConnection *connection)
{
connection->descriptor = -1;
connection->tracked_descriptor = -1;
connection->close_descriptor = -1;
}
/**
* vips_connection_filename:
* @connection: connection to operate on
*
* Returns: any filename associated with this connection, or `NULL`.
*/
const char *
vips_connection_filename(VipsConnection *connection)
{
return connection->filename;
}
/**
* vips_connection_nick:
* @connection: connection to operate on
*
* Returns: a string describing this connection which could be displayed to a
* user.
*/
const char *
vips_connection_nick(VipsConnection *connection)
{
return connection->filename ? connection->filename
: VIPS_OBJECT(connection)->nickname;
}
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