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

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
index 0000000000..14eb9ec625
--- /dev/null
+++ b/camel/camel-stream-mem.c
@@ -0,0 +1,235 @@
+/* -*- 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;
+}