d6472027ff018a89e390a6035884ee4520f5508d
[paraslash.git] / write_common.c
1 /*
2 * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /** \file write_common.c common functions of para_audiod and para_write */
20
21 #include "para.h"
22 #include "string.h"
23 #include "list.h"
24 #include "sched.h"
25 #include "write.h"
26 #include "error.h"
27
28 const char *writer_names[] ={WRITER_NAMES};
29 struct writer writers[NUM_SUPPORTED_WRITERS] = {WRITER_ARRAY};
30
31 static void wng_pre_select(__a_unused struct sched *s, struct task *t)
32 {
33 struct writer_node_group *g = t->private_data;
34 int i;
35
36 FOR_EACH_WRITER_NODE(i, g) {
37 struct writer_node *wn = &g->writer_nodes[i];
38 t->ret = wn->writer->pre_select(s, wn);
39 if (t->ret < 0) {
40 g->eof = 1;
41 return;
42 }
43 }
44 }
45
46 static void wng_post_select(struct sched *s, struct task *t)
47 {
48 struct writer_node_group *g = t->private_data;
49 int i;
50 size_t min_written = 0;
51
52 FOR_EACH_WRITER_NODE(i, g) {
53 struct writer_node *wn = &g->writer_nodes[i];
54 t->ret = wn->writer->post_select(s, wn);
55 if (t->ret < 0) {
56 g->eof = 1;
57 return;
58 }
59 if (!i)
60 min_written = t->ret;
61 else
62 min_written = PARA_MIN(min_written, t->ret);
63 }
64 *g->loaded -= min_written;
65 if (!*g->loaded && *g->input_eof) {
66 g->eof = 1;
67 t->ret = -E_WNG_EOF;
68 } else
69 t->ret = 1;
70 if (*g->loaded && min_written)
71 memmove(g->buf, g->buf + min_written, *g->loaded);
72 }
73
74 int wng_open(struct writer_node_group *g)
75 {
76 int i, ret = 1;
77
78 PARA_NOTICE_LOG("opening wng %p with %d writer(s)\n", g, g->num_writers);
79 register_task(&g->task);
80 FOR_EACH_WRITER_NODE(i, g) {
81 struct writer_node *wn = &g->writer_nodes[i];
82 wn->wng = g;
83 ret = wn->writer->open(wn);
84 if (ret < 0)
85 goto err_out;
86 wn->chunk_bytes = ret;
87 g->max_chunk_bytes = PARA_MAX(g->max_chunk_bytes, ret);
88 }
89 sprintf(g->task.status, "%s", "writer node group");
90 g->eof = 0;
91 return 1;
92 err_out:
93 unregister_task(&g->task);
94 while (i > 0) {
95 struct writer_node *wn = &g->writer_nodes[--i];
96 wn->writer->close(wn);
97 }
98 g->num_writers = 0;
99 g->eof = 1;
100 return ret;
101 }
102
103 void wng_unregister(struct writer_node_group *g)
104 {
105 unregister_task(&g->task);
106 g->eof = 1;
107 }
108
109 void wng_close(struct writer_node_group *g)
110 {
111 int i;
112
113 if (!g)
114 return;
115 PARA_NOTICE_LOG("closing wng with %d writer(s)\n", g->num_writers);
116 FOR_EACH_WRITER_NODE(i, g) {
117 struct writer_node *wn = &g->writer_nodes[i];
118 wn->writer->close(wn);
119 }
120 free(g->written);
121 free(g->writer_nodes);
122 free(g);
123 }
124
125 struct writer_node_group *wng_new(unsigned num_writers)
126 {
127 struct writer_node_group *g = para_calloc(sizeof(struct writer_node_group));
128 g->num_writers = num_writers;
129 g->writer_nodes = para_calloc(num_writers
130 * sizeof(struct writer_node));
131 g->written = para_calloc(num_writers * sizeof(size_t));
132 g->task.private_data = g;
133 g->task.post_select = wng_post_select;
134 g->task.pre_select = wng_pre_select;
135 return g;
136 }
137
138 void init_supported_writers(void)
139 {
140 int i;
141
142 FOR_EACH_WRITER(i)
143 writers[i].init(&writers[i]);
144 }
145
146 void *check_writer_arg(char *wa, int *writer_num)
147 {
148 int i;
149
150 *writer_num = -E_WRITE_COMMON_SYNTAX;
151 PARA_INFO_LOG("checking %s\n", wa);
152 FOR_EACH_WRITER(i) {
153 const char *name = writer_names[i];
154 size_t len = strlen(name);
155 char c;
156 if (strlen(wa) < len)
157 continue;
158 if (strncmp(name, wa, len))
159 continue;
160 c = wa[len];
161 if (c && c != ' ')
162 continue;
163 if (c && !writers[i].parse_config)
164 return NULL;
165 *writer_num = i;
166 return writers[i].parse_config(c? wa + len + 1 : "");
167 }
168 PARA_ERROR_LOG("%s", "writer not found\n");
169 return NULL;
170 }
171
172 struct writer_node_group *setup_default_wng(void)
173 {
174 struct writer_node_group *wng = wng_new(1);
175 enum writer_enum default_writer;
176
177 if (NUM_SUPPORTED_WRITERS == 1)
178 default_writer = FILE_WRITE;
179 else
180 default_writer = 1;
181 wng->writer_nodes[0].writer = &writers[default_writer];
182 PARA_INFO_LOG("using default writer: %s %p\n",
183 writer_names[default_writer], writers[default_writer].parse_config);
184 wng->writer_nodes[0].conf = writers[default_writer].parse_config("");
185 return wng;
186 }