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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 <config.h> | |
21 | #include <sys/types.h> | |
22 | #include <sys/stat.h> | |
23 | #include <fcntl.h> | |
24 | #include <unistd.h> | |
25 | #include <sys/time.h> | |
26 | #include <zip.h> | |
27 | #include <libsigrok/libsigrok.h> | |
28 | #include "libsigrok-internal.h" | |
29 | ||
30 | #define LOG_PREFIX "virtual-session" | |
31 | ||
32 | /* size of payloads sent across the session bus */ | |
33 | /** @cond PRIVATE */ | |
34 | #define CHUNKSIZE (512 * 1024) | |
35 | /** @endcond */ | |
36 | ||
37 | SR_PRIV struct sr_dev_driver 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 | SR_CONF_SET, | |
54 | SR_CONF_CAPTURE_UNITSIZE | SR_CONF_GET | SR_CONF_SET, | |
55 | SR_CONF_NUM_LOGIC_CHANNELS | SR_CONF_SET, | |
56 | SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET, | |
57 | SR_CONF_SESSIONFILE | SR_CONF_SET, | |
58 | }; | |
59 | ||
60 | static gboolean stream_session_data(struct sr_dev_inst *sdi) | |
61 | { | |
62 | struct session_vdev *vdev; | |
63 | struct sr_datafeed_packet packet; | |
64 | struct sr_datafeed_logic logic; | |
65 | struct zip_stat zs; | |
66 | int ret, got_data; | |
67 | char capturefile[16]; | |
68 | void *buf; | |
69 | ||
70 | got_data = FALSE; | |
71 | vdev = sdi->priv; | |
72 | if (!vdev->capfile) { | |
73 | /* No capture file opened yet, or finished with the last | |
74 | * chunked one. */ | |
75 | if (vdev->cur_chunk == 0) { | |
76 | /* capturefile is always the unchunked base name. */ | |
77 | if (zip_stat(vdev->archive, vdev->capturefile, 0, &zs) != -1) { | |
78 | /* No chunks, just a single capture file. */ | |
79 | vdev->cur_chunk = 0; | |
80 | if (!(vdev->capfile = zip_fopen(vdev->archive, | |
81 | vdev->capturefile, 0))) | |
82 | return FALSE; | |
83 | sr_dbg("Opened %s.", vdev->capturefile); | |
84 | } else { | |
85 | /* Try as first chunk filename. */ | |
86 | snprintf(capturefile, 15, "%s-1", vdev->capturefile); | |
87 | if (zip_stat(vdev->archive, capturefile, 0, &zs) != -1) { | |
88 | vdev->cur_chunk = 1; | |
89 | if (!(vdev->capfile = zip_fopen(vdev->archive, | |
90 | capturefile, 0))) | |
91 | return FALSE; | |
92 | sr_dbg("Opened %s.", capturefile); | |
93 | } else { | |
94 | sr_err("No capture file '%s' in " "session file '%s'.", | |
95 | vdev->capturefile, vdev->sessionfile); | |
96 | return FALSE; | |
97 | } | |
98 | } | |
99 | } else { | |
100 | /* Capture data is chunked, advance to the next chunk. */ | |
101 | vdev->cur_chunk++; | |
102 | snprintf(capturefile, 15, "%s-%d", vdev->capturefile, | |
103 | vdev->cur_chunk); | |
104 | if (zip_stat(vdev->archive, capturefile, 0, &zs) != -1) { | |
105 | if (!(vdev->capfile = zip_fopen(vdev->archive, | |
106 | capturefile, 0))) | |
107 | return FALSE; | |
108 | sr_dbg("Opened %s.", capturefile); | |
109 | } else { | |
110 | /* We got all the chunks, finish up. */ | |
111 | return FALSE; | |
112 | } | |
113 | } | |
114 | } | |
115 | ||
116 | buf = g_malloc(CHUNKSIZE); | |
117 | ||
118 | ret = zip_fread(vdev->capfile, buf, | |
119 | CHUNKSIZE / vdev->unitsize * vdev->unitsize); | |
120 | if (ret > 0) { | |
121 | if (ret % vdev->unitsize != 0) | |
122 | sr_warn("Read size %d not a multiple of the" | |
123 | " unit size %d.", ret, vdev->unitsize); | |
124 | got_data = TRUE; | |
125 | packet.type = SR_DF_LOGIC; | |
126 | packet.payload = &logic; | |
127 | logic.length = ret; | |
128 | logic.unitsize = vdev->unitsize; | |
129 | logic.data = buf; | |
130 | vdev->bytes_read += ret; | |
131 | sr_session_send(sdi, &packet); | |
132 | } else { | |
133 | /* done with this capture file */ | |
134 | zip_fclose(vdev->capfile); | |
135 | vdev->capfile = NULL; | |
136 | if (vdev->cur_chunk != 0) { | |
137 | /* There might be more chunks, so don't fall through | |
138 | * to the SR_DF_END here. */ | |
139 | got_data = TRUE; | |
140 | } | |
141 | } | |
142 | g_free(buf); | |
143 | ||
144 | return got_data; | |
145 | } | |
146 | ||
147 | static int receive_data(int fd, int revents, void *cb_data) | |
148 | { | |
149 | struct sr_dev_inst *sdi; | |
150 | struct session_vdev *vdev; | |
151 | struct sr_datafeed_packet packet; | |
152 | ||
153 | (void)fd; | |
154 | (void)revents; | |
155 | ||
156 | sdi = cb_data; | |
157 | vdev = sdi->priv; | |
158 | ||
159 | if (!vdev->finished && !stream_session_data(sdi)) | |
160 | vdev->finished = TRUE; | |
161 | if (!vdev->finished) | |
162 | return G_SOURCE_CONTINUE; | |
163 | ||
164 | if (vdev->capfile) { | |
165 | zip_fclose(vdev->capfile); | |
166 | vdev->capfile = NULL; | |
167 | } | |
168 | if (vdev->archive) { | |
169 | zip_discard(vdev->archive); | |
170 | vdev->archive = NULL; | |
171 | } | |
172 | packet.type = SR_DF_END; | |
173 | packet.payload = NULL; | |
174 | sr_session_send(sdi, &packet); | |
175 | ||
176 | return G_SOURCE_REMOVE; | |
177 | } | |
178 | ||
179 | /* driver callbacks */ | |
180 | ||
181 | static int init(struct sr_dev_driver *di, struct sr_context *sr_ctx) | |
182 | { | |
183 | return std_init(sr_ctx, di, LOG_PREFIX); | |
184 | } | |
185 | ||
186 | static int dev_clear(const struct sr_dev_driver *di) | |
187 | { | |
188 | struct drv_context *drvc; | |
189 | GSList *l; | |
190 | ||
191 | drvc = di->context; | |
192 | for (l = drvc->instances; l; l = l->next) | |
193 | sr_dev_inst_free(l->data); | |
194 | g_slist_free(drvc->instances); | |
195 | drvc->instances = NULL; | |
196 | ||
197 | return SR_OK; | |
198 | } | |
199 | ||
200 | static int dev_open(struct sr_dev_inst *sdi) | |
201 | { | |
202 | struct sr_dev_driver *di; | |
203 | struct drv_context *drvc; | |
204 | struct session_vdev *vdev; | |
205 | ||
206 | di = sdi->driver; | |
207 | drvc = di->context; | |
208 | vdev = g_malloc0(sizeof(struct session_vdev)); | |
209 | sdi->priv = vdev; | |
210 | drvc->instances = g_slist_append(drvc->instances, sdi); | |
211 | ||
212 | return SR_OK; | |
213 | } | |
214 | ||
215 | static int dev_close(struct sr_dev_inst *sdi) | |
216 | { | |
217 | const struct session_vdev *const vdev = sdi->priv; | |
218 | g_free(vdev->sessionfile); | |
219 | g_free(vdev->capturefile); | |
220 | ||
221 | g_free(sdi->priv); | |
222 | sdi->priv = NULL; | |
223 | ||
224 | return SR_OK; | |
225 | } | |
226 | ||
227 | static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi, | |
228 | const struct sr_channel_group *cg) | |
229 | { | |
230 | struct session_vdev *vdev; | |
231 | ||
232 | (void)cg; | |
233 | ||
234 | if (!sdi) | |
235 | return SR_ERR; | |
236 | ||
237 | vdev = sdi->priv; | |
238 | ||
239 | switch (key) { | |
240 | case SR_CONF_SAMPLERATE: | |
241 | *data = g_variant_new_uint64(vdev->samplerate); | |
242 | break; | |
243 | case SR_CONF_CAPTURE_UNITSIZE: | |
244 | *data = g_variant_new_uint64(vdev->unitsize); | |
245 | break; | |
246 | default: | |
247 | return SR_ERR_NA; | |
248 | } | |
249 | ||
250 | return SR_OK; | |
251 | } | |
252 | ||
253 | static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi, | |
254 | const struct sr_channel_group *cg) | |
255 | { | |
256 | struct session_vdev *vdev; | |
257 | ||
258 | (void)cg; | |
259 | ||
260 | vdev = sdi->priv; | |
261 | ||
262 | switch (key) { | |
263 | case SR_CONF_SAMPLERATE: | |
264 | vdev->samplerate = g_variant_get_uint64(data); | |
265 | sr_info("Setting samplerate to %" PRIu64 ".", vdev->samplerate); | |
266 | break; | |
267 | case SR_CONF_SESSIONFILE: | |
268 | g_free(vdev->sessionfile); | |
269 | vdev->sessionfile = g_strdup(g_variant_get_string(data, NULL)); | |
270 | sr_info("Setting sessionfile to '%s'.", vdev->sessionfile); | |
271 | break; | |
272 | case SR_CONF_CAPTUREFILE: | |
273 | g_free(vdev->capturefile); | |
274 | vdev->capturefile = g_strdup(g_variant_get_string(data, NULL)); | |
275 | sr_info("Setting capturefile to '%s'.", vdev->capturefile); | |
276 | break; | |
277 | case SR_CONF_CAPTURE_UNITSIZE: | |
278 | vdev->unitsize = g_variant_get_uint64(data); | |
279 | break; | |
280 | case SR_CONF_NUM_LOGIC_CHANNELS: | |
281 | vdev->num_channels = g_variant_get_int32(data); | |
282 | break; | |
283 | default: | |
284 | return SR_ERR_NA; | |
285 | } | |
286 | ||
287 | return SR_OK; | |
288 | } | |
289 | ||
290 | static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi, | |
291 | const struct sr_channel_group *cg) | |
292 | { | |
293 | (void)sdi; | |
294 | (void)cg; | |
295 | ||
296 | switch (key) { | |
297 | case SR_CONF_DEVICE_OPTIONS: | |
298 | *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32, | |
299 | devopts, ARRAY_SIZE(devopts), sizeof(uint32_t)); | |
300 | break; | |
301 | default: | |
302 | return SR_ERR_NA; | |
303 | } | |
304 | ||
305 | return SR_OK; | |
306 | } | |
307 | ||
308 | static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data) | |
309 | { | |
310 | struct session_vdev *vdev; | |
311 | int ret; | |
312 | ||
313 | (void)cb_data; | |
314 | ||
315 | vdev = sdi->priv; | |
316 | vdev->bytes_read = 0; | |
317 | vdev->cur_chunk = 0; | |
318 | vdev->finished = FALSE; | |
319 | ||
320 | sr_info("Opening archive %s file %s", vdev->sessionfile, | |
321 | vdev->capturefile); | |
322 | ||
323 | if (!(vdev->archive = zip_open(vdev->sessionfile, 0, &ret))) { | |
324 | sr_err("Failed to open session file '%s': " | |
325 | "zip error %d.", vdev->sessionfile, ret); | |
326 | return SR_ERR; | |
327 | } | |
328 | ||
329 | /* Send header packet to the session bus. */ | |
330 | std_session_send_df_header(sdi, LOG_PREFIX); | |
331 | ||
332 | /* freewheeling source */ | |
333 | sr_session_source_add(sdi->session, -1, 0, 0, receive_data, (void *)sdi); | |
334 | ||
335 | return SR_OK; | |
336 | } | |
337 | ||
338 | static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data) | |
339 | { | |
340 | struct session_vdev *vdev; | |
341 | ||
342 | (void)cb_data; | |
343 | vdev = sdi->priv; | |
344 | ||
345 | vdev->finished = TRUE; | |
346 | ||
347 | return SR_OK; | |
348 | } | |
349 | ||
350 | /** @private */ | |
351 | SR_PRIV struct sr_dev_driver session_driver = { | |
352 | .name = "virtual-session", | |
353 | .longname = "Session-emulating driver", | |
354 | .api_version = 1, | |
355 | .init = init, | |
356 | .cleanup = dev_clear, | |
357 | .scan = NULL, | |
358 | .dev_list = NULL, | |
359 | .dev_clear = dev_clear, | |
360 | .config_get = config_get, | |
361 | .config_set = config_set, | |
362 | .config_list = config_list, | |
363 | .dev_open = dev_open, | |
364 | .dev_close = dev_close, | |
365 | .dev_acquisition_start = dev_acquisition_start, | |
366 | .dev_acquisition_stop = dev_acquisition_stop, | |
367 | .context = NULL, | |
368 | }; |