/*
* Amanda, The Advanced Maryland Automatic Network Disk Archiver
* Copyright (c) 2008-2012 Zmanda, Inc. All Rights Reserved.
* Copyright (c) 2013-2016 Carbonite, 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
* 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
*
* Contact information: Carbonite Inc., 756 N Pastoria Ave
* Sunnyvale, CA 94085, or: http://www.zmanda.com
*/
#include "amanda.h"
#include "amxfer.h"
#include "simpleprng.h"
/*
* Class declaration
*
* This declaration is entirely private; nothing but xfer_source_pattern() references
* it directly.
*/
GType xfer_source_pattern_get_type(void);
#define XFER_SOURCE_PATTERN_TYPE (xfer_source_pattern_get_type())
#define XFER_SOURCE_PATTERN(obj) G_TYPE_CHECK_INSTANCE_CAST((obj), xfer_source_pattern_get_type(), XferSourcePattern)
#define XFER_SOURCE_PATTERN_CONST(obj) G_TYPE_CHECK_INSTANCE_CAST((obj), xfer_source_pattern_get_type(), XferSourcePattern const)
#define XFER_SOURCE_PATTERN_CLASS(klass) G_TYPE_CHECK_CLASS_CAST((klass), xfer_source_pattern_get_type(), XferSourcePatternClass)
#define IS_XFER_SOURCE_PATTERN(obj) G_TYPE_CHECK_INSTANCE_TYPE((obj), xfer_source_pattern_get_type ())
#define XFER_SOURCE_PATTERN_GET_CLASS(obj) G_TYPE_INSTANCE_GET_CLASS((obj), xfer_source_pattern_get_type(), XferSourcePatternClass)
static GObjectClass *parent_class = NULL;
/*
* Main object structure
*/
typedef struct XferSourcePattern {
XferElement __parent__;
gboolean limited_length;
guint64 length;
size_t pattern_buffer_length;
size_t current_offset;
char * pattern;
} XferSourcePattern;
/*
* Class definition
*/
typedef struct {
XferElementClass __parent__;
} XferSourcePatternClass;
/*
* Implementation
*/
/*
* Utility function to fill a buffer buf of size len with the pattern defined
* for this instance. We start each copying from the offset where we left the
* previous one.
*
* Note that performance is important: amtapetype uses this very source and
* source-random.c to determine whether a tape device uses compression, and
* expects the two to run about the same speed. This is why this is a byte
* loop and does not use mempcy() and friends: the random source is also byte
* per byte.
*/
static void fill_buffer_with_pattern(XferSourcePattern *self, char *buf,
size_t len)
{
char *src = self->pattern, *dst = buf;
size_t plen = self->pattern_buffer_length, offset = self->current_offset;
size_t pos = 0;
src += offset;
while (pos < len) {
*dst++ = *src++;
pos++, offset++;
if (G_LIKELY(offset < plen))
continue;
offset = 0;
src = self->pattern;
}
self->current_offset = offset;
}
static gpointer
pull_buffer_impl(
XferElement *elt,
size_t *size)
{
XferSourcePattern *self = (XferSourcePattern *)elt;
char *rval;
/* indicate EOF on an cancel */
if (elt->cancelled) {
*size = 0;
return NULL;
}
if (self->limited_length) {
if (self->length == 0) {
*size = 0;
return NULL;
}
*size = MIN(10240, self->length);
self->length -= *size;
} else {
*size = 10240;
}
rval = malloc(*size);
fill_buffer_with_pattern(self, rval, *size);
return rval;
}
static gpointer
pull_buffer_static_impl(
XferElement *elt,
gpointer buf,
size_t block_size,
size_t *size)
{
XferSourcePattern *self = (XferSourcePattern *)elt;
/* indicate EOF on an cancel */
if (elt->cancelled) {
*size = 0;
return NULL;
}
if (self->limited_length) {
if (self->length == 0) {
*size = 0;
return NULL;
}
*size = MIN(10240, self->length);
*size = MIN(*size, block_size);
self->length -= *size;
} else {
*size = 10240;
}
fill_buffer_with_pattern(self, buf, *size);
return buf;
}
static void
instance_init(
XferElement *elt)
{
elt->can_generate_eof = TRUE;
}
static void
class_init(
XferSourcePatternClass * selfc)
{
XferElementClass *klass = XFER_ELEMENT_CLASS(selfc);
static xfer_element_mech_pair_t mech_pairs[] = {
{ XFER_MECH_NONE, XFER_MECH_PULL_BUFFER, XFER_NROPS(1), XFER_NTHREADS(0), XFER_NALLOC(1) },
{ XFER_MECH_NONE, XFER_MECH_PULL_BUFFER_STATIC, XFER_NROPS(1), XFER_NTHREADS(0), XFER_NALLOC(0) },
{ XFER_MECH_NONE, XFER_MECH_NONE, XFER_NROPS(0), XFER_NTHREADS(0), XFER_NALLOC(0) },
};
klass->pull_buffer = pull_buffer_impl;
klass->pull_buffer_static = pull_buffer_static_impl;
klass->perl_class = "Amanda::Xfer::Source::Pattern";
klass->mech_pairs = mech_pairs;
parent_class = g_type_class_peek_parent(selfc);
}
GType
xfer_source_pattern_get_type (void)
{
static GType type = 0;
if (G_UNLIKELY(type == 0)) {
static const GTypeInfo info = {
sizeof (XferSourcePatternClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) class_init,
(GClassFinalizeFunc) NULL,
NULL /* class_data */,
sizeof (XferSourcePattern),
0 /* n_preallocs */,
(GInstanceInitFunc) instance_init,
NULL
};
type = g_type_register_static (XFER_ELEMENT_TYPE, "XferSourcePattern", &info, 0);
}
return type;
}
/* create an element of this class; prototype is in xfer-element.h */
XferElement * xfer_source_pattern(guint64 length, void * pattern,
size_t pattern_length) {
XferSourcePattern *xsp =
(XferSourcePattern *)g_object_new(XFER_SOURCE_PATTERN_TYPE, NULL);
XferElement *elt = XFER_ELEMENT(xsp);
xsp->length = length;
xsp->limited_length = (length > 0);
xsp->pattern = g_memdup(pattern, pattern_length);
xsp->pattern_buffer_length = pattern_length;
xsp->current_offset = 0;
return elt;
}