92 lines
3.1 KiB
C
92 lines
3.1 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; fill-column: 160 -*- */
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/* camel-stream.c : abstract class for a stream */
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/*
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* Author:
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* Michael Zucchi <notzed@ximian.com>
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*
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* Copyright 1999, 2000 Ximian, Inc. (www.ximian.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "camel-stream-null.h"
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static CamelObjectClass *parent_class = NULL;
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/* Returns the class for a CamelStream */
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#define CS_CLASS(so) CAMEL_STREAM_NULL_CLASS(CAMEL_OBJECT_GET_CLASS(so))
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/* dummy implementations, for a NULL stream */
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static ssize_t stream_read (CamelStream *stream, char *buffer, size_t n) { return 0; }
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static ssize_t stream_write (CamelStream *stream, const char *buffer, size_t n) { ((CamelStreamNull *)stream)->written += n; return n; }
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static int stream_close (CamelStream *stream) { return 0; }
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static int stream_flush (CamelStream *stream) { return 0; }
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static gboolean stream_eos (CamelStream *stream) { return TRUE; }
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static int stream_reset (CamelStream *stream) { ((CamelStreamNull *)stream)->written = 0; return 0; }
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static void
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camel_stream_null_class_init (CamelStreamClass *camel_stream_null_class)
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{
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CamelStreamClass *camel_stream_class = (CamelStreamClass *)camel_stream_null_class;
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parent_class = camel_type_get_global_classfuncs( CAMEL_OBJECT_TYPE );
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/* virtual method definition */
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camel_stream_class->read = stream_read;
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camel_stream_class->write = stream_write;
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camel_stream_class->close = stream_close;
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camel_stream_class->flush = stream_flush;
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camel_stream_class->eos = stream_eos;
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camel_stream_class->reset = stream_reset;
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}
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CamelType
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camel_stream_null_get_type (void)
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{
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static CamelType camel_stream_null_type = CAMEL_INVALID_TYPE;
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if (camel_stream_null_type == CAMEL_INVALID_TYPE) {
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camel_stream_null_type = camel_type_register( camel_stream_get_type(),
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"CamelStreamNull",
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sizeof( CamelStreamNull ),
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sizeof( CamelStreamNullClass ),
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(CamelObjectClassInitFunc) camel_stream_null_class_init,
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NULL,
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NULL,
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NULL );
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}
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return camel_stream_null_type;
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}
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/**
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* camel_stream_null_new:
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*
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* Returns a NULL stream. A null stream is always at eof, and
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* always returns success for all reads and writes.
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*
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* Return value: the stream
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**/
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CamelStream *
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camel_stream_null_new(void)
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{
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return (CamelStream *)camel_object_new(camel_stream_null_get_type ());
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}
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