forked from zmanda/amanda
/
xfer-dest-device.c
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/
xfer-dest-device.c
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/*
* Amanda, The Advanced Maryland Automatic Network Disk Archiver
* Copyright (c) 2009, 2010 Zmanda, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* 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
*
* Contact information: Zmanda Inc., 465 S. Mathilda Ave., Suite 300
* Sunnyvale, CA 94085, USA, or: http://www.zmanda.com
*/
#include "amanda.h"
#include "amxfer.h"
#include "device.h"
#include "property.h"
#include "xfer-device.h"
/*
* Class declaration
*
* This declaration is entirely private; nothing but xfer_dest_device() references
* it directly.
*/
GType xfer_dest_device_get_type(void);
#define XFER_DEST_DEVICE_TYPE (xfer_dest_device_get_type())
#define XFER_DEST_DEVICE(obj) G_TYPE_CHECK_INSTANCE_CAST((obj), xfer_dest_device_get_type(), XferDestDevice)
#define XFER_DEST_DEVICE_CONST(obj) G_TYPE_CHECK_INSTANCE_CAST((obj), xfer_dest_device_get_type(), XferDestDevice const)
#define XFER_DEST_DEVICE_CLASS(klass) G_TYPE_CHECK_CLASS_CAST((klass), xfer_dest_device_get_type(), XferDestDeviceClass)
#define IS_XFER_DEST_DEVICE(obj) G_TYPE_CHECK_INSTANCE_TYPE((obj), xfer_dest_device_get_type ())
#define XFER_DEST_DEVICE_GET_CLASS(obj) G_TYPE_INSTANCE_GET_CLASS((obj), xfer_dest_device_get_type(), XferDestDeviceClass)
static GObjectClass *parent_class = NULL;
/*
* Main object structure
*/
typedef struct XferDestDevice {
XferElement __parent__;
Device *device;
gboolean cancel_at_leom;
gpointer partial;
gsize block_size;
gsize partial_length;
} XferDestDevice;
/*
* Class definition
*/
typedef struct {
XferElementClass __parent__;
} XferDestDeviceClass;
/*
* Implementation
*/
static gboolean
do_block(
XferDestDevice *self,
guint size,
gpointer data)
{
XferElement *elt = XFER_ELEMENT(self);
if (!device_write_block(self->device, size, data)) {
xfer_cancel_with_error(elt, "%s: %s",
self->device->device_name, device_error_or_status(self->device));
wait_until_xfer_cancelled(elt->xfer);
return FALSE;
}
/* check for LEOM */
if (self->cancel_at_leom && self->device->is_eom) {
xfer_cancel_with_error(elt, "%s: LEOM detected", self->device->device_name);
wait_until_xfer_cancelled(elt->xfer);
return FALSE;
}
return TRUE;
}
static void
push_buffer_impl(
XferElement *elt,
gpointer buf,
size_t len)
{
XferDestDevice *self = XFER_DEST_DEVICE(elt);
gpointer to_free = buf;
/* Handle EOF */
if (!buf) {
/* write out the partial buffer, if there's anything in it */
if (self->partial_length) {
if (!do_block(self, self->block_size, self->partial)) {
return;
}
self->partial_length = 0;
}
device_finish_file(self->device);
return;
}
/* set up the block buffer, now that we can depend on having a blocksize
* from the device */
if (!self->partial) {
self->partial = g_malloc(self->device->block_size);
self->block_size = self->device->block_size;
self->partial_length = 0;
}
/* if we already have data in the buffer, add the new data to it */
if (self->partial_length != 0) {
gsize to_copy = min(self->block_size - self->partial_length, len);
memmove(self->partial + self->partial_length, buf, to_copy);
buf = (gpointer)(to_copy + (char *)buf);
len -= to_copy;
self->partial_length += to_copy;
}
/* and if the buffer is now full, write the block */
if (self->partial_length == self->block_size) {
if (!do_block(self, self->block_size, self->partial)) {
g_free(to_free);
return;
}
self->partial_length = 0;
}
/* write any whole blocks directly from the push buffer */
while (len >= self->block_size) {
if (!do_block(self, self->block_size, buf)) {
g_free(to_free);
return;
}
buf = (gpointer)(self->block_size + (char *)buf);
len -= self->block_size;
}
/* and finally store any leftover data in the partial buffer */
if (len) {
memmove(self->partial, buf, len);
self->partial_length = len;
}
g_free(to_free);
}
static void
instance_init(
XferElement *elt)
{
XferDestDevice *self = XFER_DEST_DEVICE(elt);
self->partial = NULL;
}
static void
finalize_impl(
GObject * obj_self)
{
XferDestDevice *self = XFER_DEST_DEVICE(obj_self);
if (self->partial) {
g_free(self->partial);
}
}
static void
class_init(
XferDestDeviceClass * selfc)
{
XferElementClass *klass = XFER_ELEMENT_CLASS(selfc);
GObjectClass *goc = (GObjectClass*) klass;
static xfer_element_mech_pair_t mech_pairs[] = {
{ XFER_MECH_PUSH_BUFFER, XFER_MECH_NONE, 0, 0},
{ XFER_MECH_NONE, XFER_MECH_NONE, 0, 0},
};
klass->push_buffer = push_buffer_impl;
klass->perl_class = "Amanda::Xfer::Dest::Device";
klass->mech_pairs = mech_pairs;
goc->finalize = finalize_impl;
parent_class = g_type_class_peek_parent(selfc);
}
GType
xfer_dest_device_get_type (void)
{
static GType type = 0;
if G_UNLIKELY(type == 0) {
static const GTypeInfo info = {
sizeof (XferDestDeviceClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) class_init,
(GClassFinalizeFunc) NULL,
NULL /* class_data */,
sizeof (XferDestDevice),
0 /* n_preallocs */,
(GInstanceInitFunc) instance_init,
NULL
};
type = g_type_register_static (XFER_ELEMENT_TYPE, "XferDestDevice", &info, 0);
}
return type;
}
/* create an element of this class; prototype is in xfer-device.h */
XferElement *
xfer_dest_device(
Device *device,
gboolean cancel_at_leom)
{
XferDestDevice *self = (XferDestDevice *)g_object_new(XFER_DEST_DEVICE_TYPE, NULL);
XferElement *elt = XFER_ELEMENT(self);
g_assert(device != NULL);
self->device = device;
self->cancel_at_leom = cancel_at_leom;
return elt;
}