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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2013 Bert Vermeulen <bert@biot.com> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <sys/types.h> | |
21 | #include <sys/stat.h> | |
22 | #include <fcntl.h> | |
23 | #include <unistd.h> | |
24 | #include <sys/time.h> | |
25 | #include <zip.h> | |
26 | #include "libsigrok.h" | |
27 | #include "libsigrok-internal.h" | |
28 | ||
29 | #define LOG_PREFIX "virtual-session" | |
30 | ||
31 | /* size of payloads sent across the session bus */ | |
32 | /** @cond PRIVATE */ | |
33 | #define CHUNKSIZE (512 * 1024) | |
34 | /** @endcond */ | |
35 | ||
36 | SR_PRIV struct sr_dev_driver session_driver_info; | |
37 | static struct sr_dev_driver *di = &session_driver_info; | |
38 | ||
39 | struct session_vdev { | |
40 | char *sessionfile; | |
41 | char *capturefile; | |
42 | struct zip *archive; | |
43 | struct zip_file *capfile; | |
44 | int bytes_read; | |
45 | uint64_t samplerate; | |
46 | int unitsize; | |
47 | int num_channels; | |
48 | int cur_chunk; | |
49 | gboolean finished; | |
50 | }; | |
51 | ||
52 | static const uint32_t devopts[] = { | |
53 | SR_CONF_CAPTUREFILE, | |
54 | SR_CONF_CAPTURE_UNITSIZE, | |
55 | SR_CONF_SAMPLERATE, | |
56 | }; | |
57 | ||
58 | static int receive_data(int fd, int revents, void *cb_data) | |
59 | { | |
60 | struct sr_dev_inst *sdi; | |
61 | struct session_vdev *vdev; | |
62 | struct sr_datafeed_packet packet; | |
63 | struct sr_datafeed_logic logic; | |
64 | struct zip_stat zs; | |
65 | int ret, got_data; | |
66 | char capturefile[16]; | |
67 | void *buf; | |
68 | ||
69 | (void)fd; | |
70 | (void)revents; | |
71 | ||
72 | sdi = cb_data; | |
73 | got_data = FALSE; | |
74 | vdev = sdi->priv; | |
75 | if (!vdev->finished) { | |
76 | if (!vdev->capfile) { | |
77 | /* No capture file opened yet, or finished with the last | |
78 | * chunked one. */ | |
79 | if (vdev->cur_chunk == 0) { | |
80 | /* capturefile is always the unchunked base name. */ | |
81 | if (zip_stat(vdev->archive, vdev->capturefile, 0, &zs) != -1) { | |
82 | /* No chunks, just a single capture file. */ | |
83 | vdev->cur_chunk = 0; | |
84 | if (!(vdev->capfile = zip_fopen(vdev->archive, | |
85 | vdev->capturefile, 0))) | |
86 | return FALSE; | |
87 | sr_dbg("Opened %s.", vdev->capturefile); | |
88 | } else { | |
89 | /* Try as first chunk filename. */ | |
90 | snprintf(capturefile, 15, "%s-1", vdev->capturefile); | |
91 | if (zip_stat(vdev->archive, capturefile, 0, &zs) != -1) { | |
92 | vdev->cur_chunk = 1; | |
93 | if (!(vdev->capfile = zip_fopen(vdev->archive, | |
94 | capturefile, 0))) | |
95 | return FALSE; | |
96 | sr_dbg("Opened %s.", capturefile); | |
97 | } else { | |
98 | sr_err("No capture file '%s' in " "session file '%s'.", | |
99 | vdev->capturefile, vdev->sessionfile); | |
100 | return FALSE; | |
101 | } | |
102 | } | |
103 | } else { | |
104 | /* Capture data is chunked, advance to the next chunk. */ | |
105 | vdev->cur_chunk++; | |
106 | snprintf(capturefile, 15, "%s-%d", vdev->capturefile, | |
107 | vdev->cur_chunk); | |
108 | if (zip_stat(vdev->archive, capturefile, 0, &zs) != -1) { | |
109 | if (!(vdev->capfile = zip_fopen(vdev->archive, | |
110 | capturefile, 0))) | |
111 | return FALSE; | |
112 | sr_dbg("Opened %s.", capturefile); | |
113 | } else { | |
114 | /* We got all the chunks, finish up. */ | |
115 | vdev->finished = TRUE; | |
116 | return TRUE; | |
117 | } | |
118 | } | |
119 | } | |
120 | ||
121 | if (!(buf = g_try_malloc(CHUNKSIZE))) { | |
122 | sr_err("%s: buf malloc failed", __func__); | |
123 | return FALSE; | |
124 | } | |
125 | ||
126 | ret = zip_fread(vdev->capfile, buf, | |
127 | CHUNKSIZE / vdev->unitsize * vdev->unitsize); | |
128 | if (ret > 0) { | |
129 | if (ret % vdev->unitsize != 0) | |
130 | sr_warn("Read size %d not a multiple of the" | |
131 | " unit size %d.", ret, vdev->unitsize); | |
132 | got_data = TRUE; | |
133 | packet.type = SR_DF_LOGIC; | |
134 | packet.payload = &logic; | |
135 | logic.length = ret; | |
136 | logic.unitsize = vdev->unitsize; | |
137 | logic.data = buf; | |
138 | vdev->bytes_read += ret; | |
139 | sr_session_send(sdi, &packet); | |
140 | } else { | |
141 | /* done with this capture file */ | |
142 | zip_fclose(vdev->capfile); | |
143 | vdev->capfile = NULL; | |
144 | if (vdev->cur_chunk == 0) { | |
145 | /* It was the only file. */ | |
146 | vdev->finished = TRUE; | |
147 | } else { | |
148 | /* There might be more chunks, so don't fall through | |
149 | * to the SR_DF_END here. */ | |
150 | g_free(buf); | |
151 | return TRUE; | |
152 | } | |
153 | } | |
154 | g_free(buf); | |
155 | } | |
156 | ||
157 | if (!got_data) { | |
158 | packet.type = SR_DF_END; | |
159 | sr_session_send(sdi, &packet); | |
160 | sr_session_source_remove(sdi->session, -1); | |
161 | } | |
162 | ||
163 | return TRUE; | |
164 | } | |
165 | ||
166 | /* driver callbacks */ | |
167 | ||
168 | static int init(struct sr_context *sr_ctx) | |
169 | { | |
170 | return std_init(sr_ctx, di, LOG_PREFIX); | |
171 | } | |
172 | ||
173 | static int dev_clear(void) | |
174 | { | |
175 | struct drv_context *drvc; | |
176 | GSList *l; | |
177 | ||
178 | drvc = di->priv; | |
179 | for (l = drvc->instances; l; l = l->next) | |
180 | sr_dev_inst_free(l->data); | |
181 | g_slist_free(drvc->instances); | |
182 | drvc->instances = NULL; | |
183 | ||
184 | return SR_OK; | |
185 | } | |
186 | ||
187 | static int dev_open(struct sr_dev_inst *sdi) | |
188 | { | |
189 | struct drv_context *drvc; | |
190 | struct session_vdev *vdev; | |
191 | ||
192 | drvc = di->priv; | |
193 | vdev = g_malloc0(sizeof(struct session_vdev)); | |
194 | sdi->priv = vdev; | |
195 | drvc->instances = g_slist_append(drvc->instances, sdi); | |
196 | ||
197 | return SR_OK; | |
198 | } | |
199 | ||
200 | static int dev_close(struct sr_dev_inst *sdi) | |
201 | { | |
202 | const struct session_vdev *const vdev = sdi->priv; | |
203 | g_free(vdev->sessionfile); | |
204 | g_free(vdev->capturefile); | |
205 | ||
206 | g_free(sdi->priv); | |
207 | sdi->priv = NULL; | |
208 | ||
209 | return SR_OK; | |
210 | } | |
211 | ||
212 | static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi, | |
213 | const struct sr_channel_group *cg) | |
214 | { | |
215 | struct session_vdev *vdev; | |
216 | ||
217 | (void)cg; | |
218 | ||
219 | switch (key) { | |
220 | case SR_CONF_SAMPLERATE: | |
221 | if (sdi) { | |
222 | vdev = sdi->priv; | |
223 | *data = g_variant_new_uint64(vdev->samplerate); | |
224 | } else | |
225 | return SR_ERR; | |
226 | break; | |
227 | default: | |
228 | return SR_ERR_NA; | |
229 | } | |
230 | ||
231 | return SR_OK; | |
232 | } | |
233 | ||
234 | static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi, | |
235 | const struct sr_channel_group *cg) | |
236 | { | |
237 | struct session_vdev *vdev; | |
238 | ||
239 | (void)cg; | |
240 | ||
241 | vdev = sdi->priv; | |
242 | ||
243 | switch (key) { | |
244 | case SR_CONF_SAMPLERATE: | |
245 | vdev->samplerate = g_variant_get_uint64(data); | |
246 | sr_info("Setting samplerate to %" PRIu64 ".", vdev->samplerate); | |
247 | break; | |
248 | case SR_CONF_SESSIONFILE: | |
249 | g_free(vdev->sessionfile); | |
250 | vdev->sessionfile = g_strdup(g_variant_get_string(data, NULL)); | |
251 | sr_info("Setting sessionfile to '%s'.", vdev->sessionfile); | |
252 | break; | |
253 | case SR_CONF_CAPTUREFILE: | |
254 | g_free(vdev->capturefile); | |
255 | vdev->capturefile = g_strdup(g_variant_get_string(data, NULL)); | |
256 | sr_info("Setting capturefile to '%s'.", vdev->capturefile); | |
257 | break; | |
258 | case SR_CONF_CAPTURE_UNITSIZE: | |
259 | vdev->unitsize = g_variant_get_uint64(data); | |
260 | break; | |
261 | case SR_CONF_NUM_LOGIC_CHANNELS: | |
262 | vdev->num_channels = g_variant_get_uint64(data); | |
263 | break; | |
264 | default: | |
265 | return SR_ERR_NA; | |
266 | } | |
267 | ||
268 | return SR_OK; | |
269 | } | |
270 | ||
271 | static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi, | |
272 | const struct sr_channel_group *cg) | |
273 | { | |
274 | (void)sdi; | |
275 | (void)cg; | |
276 | ||
277 | switch (key) { | |
278 | case SR_CONF_DEVICE_OPTIONS: | |
279 | *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32, | |
280 | devopts, ARRAY_SIZE(devopts), sizeof(uint32_t)); | |
281 | break; | |
282 | default: | |
283 | return SR_ERR_NA; | |
284 | } | |
285 | ||
286 | return SR_OK; | |
287 | } | |
288 | ||
289 | static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data) | |
290 | { | |
291 | struct session_vdev *vdev; | |
292 | int ret; | |
293 | ||
294 | (void)cb_data; | |
295 | ||
296 | vdev = sdi->priv; | |
297 | vdev->bytes_read = 0; | |
298 | vdev->cur_chunk = 0; | |
299 | vdev->finished = FALSE; | |
300 | ||
301 | sr_info("Opening archive %s file %s", vdev->sessionfile, | |
302 | vdev->capturefile); | |
303 | ||
304 | if (!(vdev->archive = zip_open(vdev->sessionfile, 0, &ret))) { | |
305 | sr_err("Failed to open session file '%s': " | |
306 | "zip error %d.", vdev->sessionfile, ret); | |
307 | return SR_ERR; | |
308 | } | |
309 | ||
310 | /* Send header packet to the session bus. */ | |
311 | std_session_send_df_header(sdi, LOG_PREFIX); | |
312 | ||
313 | /* freewheeling source */ | |
314 | sr_session_source_add(sdi->session, -1, 0, 0, receive_data, (void *)sdi); | |
315 | ||
316 | return SR_OK; | |
317 | } | |
318 | ||
319 | /** @private */ | |
320 | SR_PRIV struct sr_dev_driver session_driver = { | |
321 | .name = "virtual-session", | |
322 | .longname = "Session-emulating driver", | |
323 | .api_version = 1, | |
324 | .init = init, | |
325 | .cleanup = dev_clear, | |
326 | .scan = NULL, | |
327 | .dev_list = NULL, | |
328 | .dev_clear = dev_clear, | |
329 | .config_get = config_get, | |
330 | .config_set = config_set, | |
331 | .config_list = config_list, | |
332 | .dev_open = dev_open, | |
333 | .dev_close = dev_close, | |
334 | .dev_acquisition_start = dev_acquisition_start, | |
335 | .dev_acquisition_stop = NULL, | |
336 | .priv = NULL, | |
337 | }; |