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-rw-r--r--camel/camel-seekable-stream.c201
1 files changed, 0 insertions, 201 deletions
diff --git a/camel/camel-seekable-stream.c b/camel/camel-seekable-stream.c
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--- a/camel/camel-seekable-stream.c
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-/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
-
-/*
- * Author:
- * Bertrand Guiheneuf <bertrand@helixcode.com>
- *
- * Copyright 1999, 2000 Helix Code, Inc. (http://www.helixcode.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- * USA
- */
-
-
-#include <config.h>
-#include "camel-seekable-stream.h"
-
-static CamelStreamClass *parent_class = NULL;
-
-/* Returns the class for a CamelSeekableStream */
-#define CSS_CLASS(so) CAMEL_SEEKABLE_STREAM_CLASS (CAMEL_OBJECT_GET_CLASS(so))
-
-static off_t seek (CamelSeekableStream *stream, off_t offset,
- CamelStreamSeekPolicy policy);
-static off_t stream_tell (CamelSeekableStream *stream);
-static int reset (CamelStream *stream);
-static int set_bounds (CamelSeekableStream *stream, off_t start, off_t end);
-
-static void
-camel_seekable_stream_class_init (CamelSeekableStreamClass *camel_seekable_stream_class)
-{
- CamelStreamClass *camel_stream_class =
- CAMEL_STREAM_CLASS (camel_seekable_stream_class);
-
- parent_class = CAMEL_STREAM_CLASS( camel_type_get_global_classfuncs( CAMEL_STREAM_TYPE ) );
-
- /* seekable stream methods */
- camel_seekable_stream_class->seek = seek;
- camel_seekable_stream_class->tell = stream_tell;
- camel_seekable_stream_class->set_bounds = set_bounds;
-
- /* camel stream methods overload */
- camel_stream_class->reset = reset;
-}
-
-static void
-camel_seekable_stream_init (void *o)
-{
- CamelSeekableStream *stream = (CamelSeekableStream *)o;
-
- stream->bound_start = 0;
- stream->bound_end = CAMEL_STREAM_UNBOUND;
-}
-
-CamelType
-camel_seekable_stream_get_type (void)
-{
- static CamelType camel_seekable_stream_type = CAMEL_INVALID_TYPE;
-
- if (camel_seekable_stream_type == CAMEL_INVALID_TYPE) {
- camel_seekable_stream_type = camel_type_register( CAMEL_STREAM_TYPE,
- "CamelSeekableStream",
- sizeof( CamelSeekableStream ),
- sizeof( CamelSeekableStreamClass ),
- (CamelObjectClassInitFunc) camel_seekable_stream_class_init,
- NULL,
- (CamelObjectInitFunc) camel_seekable_stream_init,
- NULL );
- }
-
- return camel_seekable_stream_type;
-}
-
-
-static off_t
-seek (CamelSeekableStream *stream, off_t offset,
- CamelStreamSeekPolicy policy)
-{
- g_warning ("CamelSeekableStream::seek called on default "
- "implementation\n");
- return -1;
-}
-
-/**
- * camel_stream_seek:
- * @stream: a CamelStream object.
- * @offset: offset value
- * @policy: what to do with the offset
- *
- * Seek to the specified position in @stream.
- *
- * If @policy is CAMEL_STREAM_SET, seeks to @offset.
- *
- * If @policy is CAMEL_STREAM_CUR, seeks to the current position plus
- * @offset.
- *
- * If @policy is CAMEL_STREAM_END, seeks to the end of the stream plus
- * @offset.
- *
- * Regardless of @policy, the stream's final position will be clamped
- * to the range specified by its lower and upper bounds, and the
- * stream's eos state will be updated.
- *
- * Return value: new position, -1 if operation failed.
- **/
-off_t
-camel_seekable_stream_seek (CamelSeekableStream *stream, off_t offset,
- CamelStreamSeekPolicy policy)
-{
- g_return_val_if_fail (CAMEL_IS_SEEKABLE_STREAM (stream), -1);
-
- return CSS_CLASS (stream)->seek (stream, offset, policy);
-}
-
-
-static off_t
-stream_tell (CamelSeekableStream *stream)
-{
- return stream->position;
-}
-
-/**
- * camel_seekable_stream_tell:
- * @stream: seekable stream object
- *
- * Get the current position of a seekable stream.
- *
- * Return value: the position.
- **/
-off_t
-camel_seekable_stream_tell (CamelSeekableStream *stream)
-{
- g_return_val_if_fail (CAMEL_IS_SEEKABLE_STREAM (stream), -1);
-
- return CSS_CLASS (stream)->tell (stream);
-}
-
-static int
-set_bounds (CamelSeekableStream *stream, off_t start, off_t end)
-{
- /* store the bounds */
- stream->bound_start = start;
- stream->bound_end = end;
-
- if (start > stream->position)
- return camel_seekable_stream_seek (stream, start, CAMEL_STREAM_SET);
-
- return 0;
-}
-
-/**
- * camel_seekable_stream_set_bounds:
- * @stream: a seekable stream
- * @start: the first valid position
- * @end: the first invalid position, or CAMEL_STREAM_UNBOUND
- *
- * Set the range of valid data this stream is allowed to cover. If
- * there is to be no @end value, then @end should be set to
- * #CAMEL_STREAM_UNBOUND.
- *
- * Return value: -1 on error.
- **/
-int
-camel_seekable_stream_set_bounds (CamelSeekableStream *stream,
- off_t start, off_t end)
-{
- g_return_val_if_fail (CAMEL_IS_SEEKABLE_STREAM (stream), -1);
- g_return_val_if_fail (end == CAMEL_STREAM_UNBOUND || end >= start, -1);
-
- return CSS_CLASS (stream)->set_bounds (stream, start, end);
-}
-
-/* a default implementation of reset for seekable streams */
-static int
-reset (CamelStream *stream)
-{
- CamelSeekableStream *seekable_stream;
-
- seekable_stream = CAMEL_SEEKABLE_STREAM (stream);
-
- return camel_seekable_stream_seek (seekable_stream,
- seekable_stream->bound_start,
- CAMEL_STREAM_SET);
-}
-
-
-
-
-
-