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-rw-r--r--camel/camel-seekable-substream.c296
1 files changed, 0 insertions, 296 deletions
diff --git a/camel/camel-seekable-substream.c b/camel/camel-seekable-substream.c
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--- a/camel/camel-seekable-substream.c
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-/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
-/* camel-stream-fs.c : file system based stream
- *
- * Authors: Bertrand Guiheneuf <bertrand@helixcode.com>
- * Michael Zucchi <notzed@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-substream.h"
-#include "camel-exception.h"
-
-static CamelSeekableStreamClass *parent_class = NULL;
-
-/* Returns the class for a CamelSeekableSubStream */
-#define CSS_CLASS(so) CAMEL_SEEKABLE_SUBSTREAM_CLASS (GTK_OBJECT(so)->klass)
-
-static int stream_read (CamelStream *stream,
- char *buffer, unsigned int n,
- CamelException *ex);
-static int stream_write (CamelStream *stream,
- const char *buffer,
- unsigned int n,
- CamelException *ex);
-static void stream_flush (CamelStream *stream,
- CamelException *ex);
-static gboolean eos (CamelStream *stream);
-static off_t stream_seek (CamelSeekableStream *stream,
- off_t offset,
- CamelStreamSeekPolicy policy,
- CamelException *ex);
-static void finalize (GtkObject *object);
-
-
-static void
-camel_seekable_substream_class_init (CamelSeekableSubstreamClass *camel_seekable_substream_class)
-{
- CamelSeekableStreamClass *camel_seekable_stream_class =
- CAMEL_SEEKABLE_STREAM_CLASS (camel_seekable_substream_class);
- CamelStreamClass *camel_stream_class =
- CAMEL_STREAM_CLASS (camel_seekable_substream_class);
- GtkObjectClass *gtk_object_class =
- GTK_OBJECT_CLASS (camel_seekable_substream_class);
-
- parent_class = gtk_type_class (camel_seekable_stream_get_type ());
-
- /* virtual method definition */
-
- /* virtual method overload */
- camel_stream_class->read = stream_read;
- camel_stream_class->write = stream_write;
- camel_stream_class->flush = stream_flush;
- camel_stream_class->eos = eos;
-
- camel_seekable_stream_class->seek = stream_seek;
-
- gtk_object_class->finalize = finalize;
-}
-
-
-GtkType
-camel_seekable_substream_get_type (void)
-{
- static GtkType camel_seekable_substream_type = 0;
-
- if (!camel_seekable_substream_type) {
- GtkTypeInfo camel_seekable_substream_info =
- {
- "CamelSeekableSubstream",
- sizeof (CamelSeekableSubstream),
- sizeof (CamelSeekableSubstreamClass),
- (GtkClassInitFunc) camel_seekable_substream_class_init,
- (GtkObjectInitFunc) NULL,
- /* reserved_1 */ NULL,
- /* reserved_2 */ NULL,
- (GtkClassInitFunc) NULL,
- };
-
- camel_seekable_substream_type = gtk_type_unique (camel_seekable_stream_get_type (), &camel_seekable_substream_info);
- }
-
- return camel_seekable_substream_type;
-}
-
-static void
-finalize (GtkObject *object)
-{
- CamelSeekableSubstream *seekable_substream =
- CAMEL_SEEKABLE_SUBSTREAM (object);
-
- if (seekable_substream->parent_stream)
- gtk_object_unref (GTK_OBJECT (seekable_substream->parent_stream));
-
- GTK_OBJECT_CLASS (parent_class)->finalize (object);
-}
-
-/**
- * camel_seekable_substream_new_with_seekable_stream_and_bounds:
- * @parent_stream: a seekable parent stream
- * @inf_bound: a lower bound
- * @sup_bound: an upper bound
- *
- * Creates a new CamelSeekableSubstream that references the portion
- * of @parent_stream from @inf_bound to @sup_bound. (If @sup_bound is
- * #CAMEL_STREAM_UNBOUND, it references to the end of stream, even if
- * the stream grows.)
- *
- * While the substream is open, the caller cannot assume anything about
- * the current position of @parent_stream. After the substream has been
- * closed, @parent_stream will stabilize again.
- *
- * Return value: the substream
- **/
-CamelStream *
-camel_seekable_substream_new_with_seekable_stream_and_bounds (CamelSeekableStream *parent_stream,
- off_t start, off_t end)
-{
- CamelSeekableSubstream *seekable_substream;
- CamelException ex;
-
- g_return_val_if_fail (CAMEL_IS_SEEKABLE_STREAM (parent_stream), NULL);
-
- /* Create the seekable substream. */
- seekable_substream = gtk_type_new (camel_seekable_substream_get_type ());
-
- /* Initialize it. */
- seekable_substream->parent_stream = parent_stream;
- gtk_object_ref (GTK_OBJECT (parent_stream));
-
- /* Set the bound of the substream. We can ignore any possible error
- * here, because if we fail to seek now, it will try again later.
- */
- camel_exception_init (&ex);
- camel_seekable_stream_set_bounds ((CamelSeekableStream *)seekable_substream, start, end, &ex);
- camel_exception_clear (&ex);
-
- return CAMEL_STREAM (seekable_substream);
-}
-
-static gboolean
-parent_reset (CamelSeekableSubstream *seekable_substream,
- CamelSeekableStream *parent, CamelException *ex)
-{
- CamelSeekableStream *seekable_stream =
- CAMEL_SEEKABLE_STREAM (seekable_substream);
-
- if (camel_seekable_stream_tell (parent) == seekable_stream->position)
- return TRUE;
-
- camel_seekable_stream_seek (parent, seekable_stream->position,
- CAMEL_STREAM_SET, ex);
- return !camel_exception_is_set (ex);
-}
-
-static int
-stream_read (CamelStream *stream, char *buffer, unsigned int n,
- CamelException *ex)
-{
- CamelSeekableStream *parent;
- CamelSeekableStream *seekable_stream = CAMEL_SEEKABLE_STREAM (stream);
- CamelSeekableSubstream *seekable_substream =
- CAMEL_SEEKABLE_SUBSTREAM (stream);
- int v;
-
- if (n == 0)
- return 0;
-
- parent = seekable_substream->parent_stream;
-
- /* Go to our position in the parent stream. */
- if (!parent_reset (seekable_substream, parent, ex)) {
- stream->eos = TRUE;
- return 0;
- }
-
- /* Compute how many bytes should be read. */
- if (seekable_stream->bound_end != CAMEL_STREAM_UNBOUND)
- n = MIN (seekable_stream->bound_end - seekable_stream->position, n);
-
- if (n == 0) {
- stream->eos = TRUE;
- return 0;
- }
-
- v = camel_stream_read (CAMEL_STREAM (parent), buffer, n, ex);
-
- /* ignore <0 - its an error, let the caller deal */
- if (v > 0)
- seekable_stream->position += v;
-
- return v;
-}
-
-static int
-stream_write (CamelStream *stream, const char *buffer, unsigned int n,
- CamelException *ex)
-{
- /* NOT VALID ON SEEKABLE SUBSTREAM */
- /* Well, its entirely valid, just not implemented */
- g_warning ("CamelSeekableSubstream:: seekable substream doesn't "
- "have a write method\n");
- return -1;
-}
-
-static void
-stream_flush (CamelStream *stream, CamelException *ex)
-{
- /* NOT VALID ON SEEKABLE SUBSTREAM */
- g_warning ("CamelSeekableSubstream:: seekable substream doesn't "
- "have a flush method\n");
-}
-
-static gboolean
-eos (CamelStream *stream)
-{
- CamelSeekableSubstream *seekable_substream =
- CAMEL_SEEKABLE_SUBSTREAM (stream);
- CamelSeekableStream *seekable_stream = CAMEL_SEEKABLE_STREAM (stream);
- CamelSeekableStream *parent;
- CamelException ex;
- gboolean eos;
-
- if (stream->eos)
- eos = TRUE;
- else {
- parent = seekable_substream->parent_stream;
- camel_exception_init (&ex);
- parent_reset (seekable_substream, parent, &ex);
- if (camel_exception_is_set (&ex)) {
- camel_exception_clear (&ex);
- return TRUE;
- }
-
- eos = camel_stream_eos (CAMEL_STREAM (parent));
- if (!eos && (seekable_stream->bound_end != CAMEL_STREAM_UNBOUND)) {
- eos = seekable_stream->position >= seekable_stream->bound_end;
- }
- }
-
- return eos;
-}
-
-static off_t
-stream_seek (CamelSeekableStream *seekable_stream, off_t offset,
- CamelStreamSeekPolicy policy, CamelException *ex)
-{
- CamelSeekableSubstream *seekable_substream =
- CAMEL_SEEKABLE_SUBSTREAM (seekable_stream);
- CamelStream *stream = CAMEL_STREAM (seekable_stream);
- off_t real_offset = 0;
-
- stream->eos = FALSE;
-
- switch (policy) {
- case CAMEL_STREAM_SET:
- real_offset = offset;
- break;
-
- case CAMEL_STREAM_CUR:
- real_offset = seekable_stream->position + offset;
- break;
-
- case CAMEL_STREAM_END:
- real_offset = camel_seekable_stream_seek (seekable_substream->parent_stream,
- offset,
- CAMEL_STREAM_END,
- ex);
- if (camel_exception_is_set (ex))
- return -1;
- break;
- }
-
- if (seekable_stream->bound_end != CAMEL_STREAM_UNBOUND)
- real_offset = MIN (real_offset, seekable_stream->bound_end);
-
- if (real_offset<seekable_stream->bound_start)
- real_offset = seekable_stream->bound_start;
-
- seekable_stream->position = real_offset;
- return real_offset;
-}
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