2 * Amanda, The Advanced Maryland Automatic Network Disk Archiver
3 * Copyright (c) 2008, 2009, 2010 Zmanda, Inc. All Rights Reserved.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published
7 * by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 * Contact information: Zmanda Inc., 465 S. Mathilda Ave., Suite 300
19 * Sunnyvale, CA 94085, USA, or: http://www.zmanda.com
24 #include "simpleprng.h"
29 * This declaration is entirely private; nothing but xfer_source_random() references
33 GType xfer_source_random_get_type(void);
34 #define XFER_SOURCE_RANDOM_TYPE (xfer_source_random_get_type())
35 #define XFER_SOURCE_RANDOM(obj) G_TYPE_CHECK_INSTANCE_CAST((obj), xfer_source_random_get_type(), XferSourceRandom)
36 #define XFER_SOURCE_RANDOM_CONST(obj) G_TYPE_CHECK_INSTANCE_CAST((obj), xfer_source_random_get_type(), XferSourceRandom const)
37 #define XFER_SOURCE_RANDOM_CLASS(klass) G_TYPE_CHECK_CLASS_CAST((klass), xfer_source_random_get_type(), XferSourceRandomClass)
38 #define IS_XFER_SOURCE_RANDOM(obj) G_TYPE_CHECK_INSTANCE_TYPE((obj), xfer_source_random_get_type ())
39 #define XFER_SOURCE_RANDOM_GET_CLASS(obj) G_TYPE_INSTANCE_GET_CLASS((obj), xfer_source_random_get_type(), XferSourceRandomClass)
41 static GObjectClass *parent_class = NULL;
44 * Main object structure
47 typedef struct XferSourceRandom {
48 XferElement __parent__;
50 gboolean limited_length;
52 simpleprng_state_t prng;
60 XferElementClass __parent__;
62 guint32 (*get_seed)(XferSourceRandom *elt);
63 } XferSourceRandomClass;
71 XferSourceRandom *self)
73 return simpleprng_get_seed(&self->prng);
81 XferSourceRandom *self = (XferSourceRandom *)elt;
84 if (elt->cancelled || (self->limited_length && self->length == 0)) {
89 if (self->limited_length) {
90 *size = MIN(10240, self->length);
91 self->length -= *size;
96 buf = g_malloc(*size);
97 simpleprng_fill_buffer(&self->prng, buf, *size);
106 elt->can_generate_eof = TRUE;
111 XferSourceRandomClass * selfc)
113 XferElementClass *klass = XFER_ELEMENT_CLASS(selfc);
114 static xfer_element_mech_pair_t mech_pairs[] = {
115 { XFER_MECH_NONE, XFER_MECH_PULL_BUFFER, 1, 0},
116 { XFER_MECH_NONE, XFER_MECH_NONE, 0, 0},
119 selfc->get_seed = get_seed_impl;
120 klass->pull_buffer = pull_buffer_impl;
122 klass->perl_class = "Amanda::Xfer::Source::Random";
123 klass->mech_pairs = mech_pairs;
125 parent_class = g_type_class_peek_parent(selfc);
129 xfer_source_random_get_type (void)
131 static GType type = 0;
133 if G_UNLIKELY(type == 0) {
134 static const GTypeInfo info = {
135 sizeof (XferSourceRandomClass),
136 (GBaseInitFunc) NULL,
137 (GBaseFinalizeFunc) NULL,
138 (GClassInitFunc) class_init,
139 (GClassFinalizeFunc) NULL,
140 NULL /* class_data */,
141 sizeof (XferSourceRandom),
143 (GInstanceInitFunc) instance_init,
147 type = g_type_register_static (XFER_ELEMENT_TYPE, "XferSourceRandom", &info, 0);
154 xfer_source_random_get_seed(
157 XferSourceRandomClass *klass;
158 g_assert(IS_XFER_SOURCE_RANDOM(elt));
160 klass = XFER_SOURCE_RANDOM_GET_CLASS(elt);
161 return klass->get_seed(XFER_SOURCE_RANDOM(elt));
164 /* create an element of this class; prototype is in xfer-element.h */
170 XferSourceRandom *xsr = (XferSourceRandom *)g_object_new(XFER_SOURCE_RANDOM_TYPE, NULL);
171 XferElement *elt = XFER_ELEMENT(xsr);
173 xsr->length = length;
174 xsr->limited_length = (length != 0);
175 simpleprng_seed(&xsr->prng, prng_seed);