2 * Amanda, The Advanced Maryland Automatic Network Disk Archiver
3 * Copyright (c) 2008,2009 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_pattern() references
33 GType xfer_source_pattern_get_type(void);
34 #define XFER_SOURCE_PATTERN_TYPE (xfer_source_pattern_get_type())
35 #define XFER_SOURCE_PATTERN(obj) G_TYPE_CHECK_INSTANCE_CAST((obj), xfer_source_pattern_get_type(), XferSourcePattern)
36 #define XFER_SOURCE_PATTERN_CONST(obj) G_TYPE_CHECK_INSTANCE_CAST((obj), xfer_source_pattern_get_type(), XferSourcePattern const)
37 #define XFER_SOURCE_PATTERN_CLASS(klass) G_TYPE_CHECK_CLASS_CAST((klass), xfer_source_pattern_get_type(), XferSourcePatternClass)
38 #define IS_XFER_SOURCE_PATTERN(obj) G_TYPE_CHECK_INSTANCE_TYPE((obj), xfer_source_pattern_get_type ())
39 #define XFER_SOURCE_PATTERN_GET_CLASS(obj) G_TYPE_INSTANCE_GET_CLASS((obj), xfer_source_pattern_get_type(), XferSourcePatternClass)
41 static GObjectClass *parent_class = NULL;
44 * Main object structure
47 typedef struct XferSourcePattern {
48 XferElement __parent__;
50 gboolean limited_length;
52 size_t pattern_buffer_length;
53 size_t current_offset;
62 XferElementClass __parent__;
63 } XferSourcePatternClass;
74 XferSourcePattern *self = (XferSourcePattern *)elt;
80 /* indicate EOF on an cancel */
81 if (elt->cancelled || (self->limited_length && self->length == 0)) {
86 if (self->limited_length) {
87 if (self->length == 0) {
92 *size = MIN(10240, self->length);
93 self->length -= *size;
100 /* fill the buffer "manually", instead of using fancy memcpy techniques, so
101 * that this runs at about the same speed as the random source */
104 offset = self->current_offset;
107 *(d++) = *(s + offset++);
108 if (offset >= self->pattern_buffer_length) offset = 0;
110 self->current_offset = offset;
119 elt->can_generate_eof = TRUE;
124 XferSourcePatternClass * selfc)
126 XferElementClass *klass = XFER_ELEMENT_CLASS(selfc);
127 static xfer_element_mech_pair_t mech_pairs[] = {
128 { XFER_MECH_NONE, XFER_MECH_PULL_BUFFER, 1, 0},
129 { XFER_MECH_NONE, XFER_MECH_NONE, 0, 0},
132 klass->pull_buffer = pull_buffer_impl;
134 klass->perl_class = "Amanda::Xfer::Source::Pattern";
135 klass->mech_pairs = mech_pairs;
137 parent_class = g_type_class_peek_parent(selfc);
141 xfer_source_pattern_get_type (void)
143 static GType type = 0;
145 if G_UNLIKELY(type == 0) {
146 static const GTypeInfo info = {
147 sizeof (XferSourcePatternClass),
148 (GBaseInitFunc) NULL,
149 (GBaseFinalizeFunc) NULL,
150 (GClassInitFunc) class_init,
151 (GClassFinalizeFunc) NULL,
152 NULL /* class_data */,
153 sizeof (XferSourcePattern),
155 (GInstanceInitFunc) instance_init,
159 type = g_type_register_static (XFER_ELEMENT_TYPE, "XferSourcePattern", &info, 0);
165 /* create an element of this class; prototype is in xfer-element.h */
166 XferElement * xfer_source_pattern(guint64 length, void * pattern,
167 size_t pattern_length) {
168 XferSourcePattern *xsp =
169 (XferSourcePattern *)g_object_new(XFER_SOURCE_PATTERN_TYPE, NULL);
170 XferElement *elt = XFER_ELEMENT(xsp);
172 xsp->length = length;
173 xsp->limited_length = (length > 0);
174 xsp->pattern = g_memdup(pattern, pattern_length);
175 xsp->pattern_buffer_length = pattern_length;
176 xsp->current_offset = 0;