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authorBertrand Guiheneuf <bertrand@src.gnome.org>1999-08-02 05:36:42 +0800
committerBertrand Guiheneuf <bertrand@src.gnome.org>1999-08-02 05:36:42 +0800
commitc54abe884b175add134cc07e8fda31ffa65cac26 (patch)
treede32af6f25286f1a337d69dc20c7979b841788c5 /camel/camel-stream-mem.c
parent2c543492092832d71f1f677d52a42043c8787be7 (diff)
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new memory buffer based stream.
* camel/camel-stream-mem.c: * camel/camel-stream-mem.h: new memory buffer based stream. * camel/camel-stream-fs.c (_seek): implementation for file system based stream. * camel/camel-stream.c (camel_stream_seek): new method. * camel/camel-stream-fs.c (camel_stream_fs_class_init): pass CamelStreamFsClass instead of CamelStreamClass. svn path=/trunk/; revision=1056
Diffstat (limited to 'camel/camel-stream-mem.c')
-rw-r--r--camel/camel-stream-mem.c235
1 files changed, 235 insertions, 0 deletions
diff --git a/camel/camel-stream-mem.c b/camel/camel-stream-mem.c
new file mode 100644
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+++ b/camel/camel-stream-mem.c
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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-ofmemet: 8 -*- */
+/* camel-stream-mem.c : memory buffer based stream */
+
+/* inspired by gnome-stream-mem.c in bonobo by Miguel de Icaza */
+/*
+ *
+ * Copyright (C) 1999 Bertrand Guiheneuf <Bertrand.Guiheneuf@inria.fr> .
+ *
+ * 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-stream-mem.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include "camel-log.h"
+
+static CamelStreamClass *parent_class=NULL;
+
+
+/* Returns the class for a CamelStreamMEM */
+#define CS_CLASS(so) CAMEL_STREAM_MEM_CLASS (GTK_OBJECT(so)->klass)
+
+static gint _read (CamelStream *stream, gchar *buffer, gint n);
+static gint _write (CamelStream *stream, const gchar *buffer, gint n);
+static void _flush (CamelStream *stream);
+static gint _available (CamelStream *stream);
+static gboolean _eos (CamelStream *stream);
+static void _close (CamelStream *stream);
+static gint _seek (CamelStream *stream, gint offset, CamelStreamSeekPolicy policy);
+
+
+static void
+camel_stream_mem_class_init (CamelStreamMemClass *camel_stream_mem_class)
+{
+ CamelStreamClass *camel_stream_class = CAMEL_STREAM_CLASS (camel_stream_mem_class);
+ parent_class = gtk_type_class (gtk_object_get_type ());
+
+ /* virtual method definition */
+
+ /* virtual method overload */
+ camel_stream_class->read = _read;
+ camel_stream_class->write = _write;
+ camel_stream_class->flush = _flush;
+ camel_stream_class->available = _available;
+ camel_stream_class->eos = _eos;
+ camel_stream_class->close = _close;
+ camel_stream_class->seek = _seek;
+
+}
+
+static void
+camel_stream_mem_init (gpointer object, gpointer klass)
+{
+ CamelStreamMem *camel_stream_mem = CAMEL_STREAM_MEM (object);
+ camel_stream_mem->buffer = g_byte_array_new ();
+ camel_stream_mem->position = 0;
+}
+
+GtkType
+camel_stream_mem_get_type (void)
+{
+ static GtkType camel_stream_mem_type = 0;
+
+ if (!camel_stream_mem_type) {
+ GtkTypeInfo camel_stream_mem_info =
+ {
+ "CamelStreamMem",
+ sizeof (CamelStreamMem),
+ sizeof (CamelStreamMemClass),
+ (GtkClassInitFunc) camel_stream_mem_class_init,
+ (GtkObjectInitFunc) camel_stream_mem_init,
+ /* reserved_1 */ NULL,
+ /* reserved_2 */ NULL,
+ (GtkClassInitFunc) NULL,
+ };
+
+ camel_stream_mem_type = gtk_type_unique (camel_stream_get_type (), &camel_stream_mem_info);
+ }
+
+ return camel_stream_mem_type;
+}
+
+
+
+
+/**
+ * _read: read bytes from a stream
+ * @stream: stream
+ * @buffer: buffer where bytes are stored
+ * @n: max number of bytes to read
+ *
+ *
+ *
+ * Return value: number of bytes actually read.
+ **/
+static gint
+_read (CamelStream *stream, gchar *buffer, gint n)
+{
+ CamelStreamMem *camel_stream_mem = CAMEL_STREAM_MEM (stream);
+ gint nb_bytes_to_read;
+
+ g_assert (stream);
+ nb_bytes_to_read = MIN (n, (camel_stream_mem->buffer)->len - camel_stream_mem->position);
+ if (nb_bytes_to_read) {
+ memcpy (buffer, (camel_stream_mem->buffer)->data + camel_stream_mem->position, nb_bytes_to_read);
+ camel_stream_mem->position += nb_bytes_to_read;
+ }
+ return nb_bytes_to_read;
+}
+
+
+/**
+ * _write: read bytes to a stream
+ * @stream: the stream
+ * @buffer: byte buffer
+ * @n: number of bytes to write
+ *
+ *
+ *
+ * Return value: the number of bytes actually written
+ * in the stream.
+ **/
+static gint
+_write (CamelStream *stream, const gchar *buffer, gint n)
+{
+ CamelStreamMem *camel_stream_mem = CAMEL_STREAM_MEM (stream);
+
+ g_assert (stream);
+ camel_stream_mem->buffer = g_byte_array_append (camel_stream_mem->buffer, (const guint8 *)buffer, n);
+ camel_stream_mem->position += n;
+
+}
+
+
+
+/**
+ * _flush: flush pending changes
+ * @stream: the stream
+ *
+ *
+ **/
+static void
+_flush (CamelStream *stream)
+{
+ g_warning ("Not implemented yet");
+}
+
+
+
+/**
+ * _available: return the number of bytes available for reading
+ * @stream: the stream
+ *
+ * Return the number of bytes available without blocking.
+ *
+ * Return value: the number of bytes available
+ **/
+static gint
+_available (CamelStream *stream)
+{
+ g_warning ("Not implemented yet");
+}
+
+
+/**
+ * _eos: test if there are bytes left to read
+ * @stream: the stream
+ *
+ *
+ *
+ * Return value: true if all stream has been read
+ **/
+static gboolean
+_eos (CamelStream *stream)
+{
+ g_warning ("Not implemented yet");
+}
+
+
+/**
+ * _close: close a stream
+ * @stream: the stream
+ *
+ *
+ **/
+static void
+_close (CamelStream *stream)
+{
+ g_warning ("Not implemented yet");
+}
+
+
+
+static gint
+_seek (CamelStream *stream, gint offset, CamelStreamSeekPolicy policy)
+{
+ gint position;
+ CamelStreamMem *camel_stream_mem = CAMEL_STREAM_MEM (stream);
+
+ switch (policy) {
+ case CAMEL_STREAM_SET:
+ position = offset;
+ break;
+ case CAMEL_STREAM_CUR:
+ position = camel_stream_mem->position + offset;
+ break;
+ case CAMEL_STREAM_END:
+ position = (camel_stream_mem->buffer)->len + offset;
+ break;
+ default:
+ return -1;
+ }
+
+ position = MIN (position, (camel_stream_mem->buffer)->len);
+ position = MAX (position, 0);
+
+ camel_stream_mem->position = position;
+
+ return position;
+}