2 * Amanda, The Advanced Maryland Automatic Network Disk Archiver
3 * Copyright (c) 2008-2012 Zmanda, Inc. All Rights Reserved.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 * Contact information: Zmanda Inc., 465 S. Mathilda Ave., Suite 300
20 * Sunnyvale, CA 94085, USA, or: http://www.zmanda.com
25 #include "simpleprng.h"
30 * This declaration is entirely private; nothing but xfer_source_random() references
34 GType xfer_source_random_get_type(void);
35 #define XFER_SOURCE_RANDOM_TYPE (xfer_source_random_get_type())
36 #define XFER_SOURCE_RANDOM(obj) G_TYPE_CHECK_INSTANCE_CAST((obj), xfer_source_random_get_type(), XferSourceRandom)
37 #define XFER_SOURCE_RANDOM_CONST(obj) G_TYPE_CHECK_INSTANCE_CAST((obj), xfer_source_random_get_type(), XferSourceRandom const)
38 #define XFER_SOURCE_RANDOM_CLASS(klass) G_TYPE_CHECK_CLASS_CAST((klass), xfer_source_random_get_type(), XferSourceRandomClass)
39 #define IS_XFER_SOURCE_RANDOM(obj) G_TYPE_CHECK_INSTANCE_TYPE((obj), xfer_source_random_get_type ())
40 #define XFER_SOURCE_RANDOM_GET_CLASS(obj) G_TYPE_INSTANCE_GET_CLASS((obj), xfer_source_random_get_type(), XferSourceRandomClass)
42 static GObjectClass *parent_class = NULL;
45 * Main object structure
48 typedef struct XferSourceRandom {
49 XferElement __parent__;
51 gboolean limited_length;
53 simpleprng_state_t prng;
61 XferElementClass __parent__;
63 guint32 (*get_seed)(XferSourceRandom *elt);
64 } XferSourceRandomClass;
72 XferSourceRandom *self)
74 return simpleprng_get_seed(&self->prng);
82 XferSourceRandom *self = (XferSourceRandom *)elt;
85 if (elt->cancelled || (self->limited_length && self->length == 0)) {
90 if (self->limited_length) {
91 *size = MIN(10240, self->length);
92 self->length -= *size;
97 buf = g_malloc(*size);
98 simpleprng_fill_buffer(&self->prng, buf, *size);
107 elt->can_generate_eof = TRUE;
112 XferSourceRandomClass * selfc)
114 XferElementClass *klass = XFER_ELEMENT_CLASS(selfc);
115 static xfer_element_mech_pair_t mech_pairs[] = {
116 { XFER_MECH_NONE, XFER_MECH_PULL_BUFFER, XFER_NROPS(1), XFER_NTHREADS(0) },
117 { XFER_MECH_NONE, XFER_MECH_NONE, XFER_NROPS(0), XFER_NTHREADS(0) },
120 selfc->get_seed = get_seed_impl;
121 klass->pull_buffer = pull_buffer_impl;
123 klass->perl_class = "Amanda::Xfer::Source::Random";
124 klass->mech_pairs = mech_pairs;
126 parent_class = g_type_class_peek_parent(selfc);
130 xfer_source_random_get_type (void)
132 static GType type = 0;
134 if G_UNLIKELY(type == 0) {
135 static const GTypeInfo info = {
136 sizeof (XferSourceRandomClass),
137 (GBaseInitFunc) NULL,
138 (GBaseFinalizeFunc) NULL,
139 (GClassInitFunc) class_init,
140 (GClassFinalizeFunc) NULL,
141 NULL /* class_data */,
142 sizeof (XferSourceRandom),
144 (GInstanceInitFunc) instance_init,
148 type = g_type_register_static (XFER_ELEMENT_TYPE, "XferSourceRandom", &info, 0);
155 xfer_source_random_get_seed(
158 XferSourceRandomClass *klass;
159 g_assert(IS_XFER_SOURCE_RANDOM(elt));
161 klass = XFER_SOURCE_RANDOM_GET_CLASS(elt);
162 return klass->get_seed(XFER_SOURCE_RANDOM(elt));
165 /* create an element of this class; prototype is in xfer-element.h */
171 XferSourceRandom *xsr = (XferSourceRandom *)g_object_new(XFER_SOURCE_RANDOM_TYPE, NULL);
172 XferElement *elt = XFER_ELEMENT(xsr);
174 xsr->length = length;
175 xsr->limited_length = (length != 0);
176 simpleprng_seed(&xsr->prng, prng_seed);