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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 <string.h>
21 #include <stdlib.h>
22 #include <unistd.h>
23 #include <zip.h>
24 #include <sys/types.h>
25 #include <sys/stat.h>
26 #include <errno.h>
27 #include <glib.h>
28 #include <glib/gstdio.h>
29 #include "config.h" /* Needed for PACKAGE_VERSION and others. */
30 #include "libsigrok.h"
31 #include "libsigrok-internal.h"
32
33 /** @cond PRIVATE */
34 #define LOG_PREFIX "session-file"
35 /** @endcond */
36
37 /**
38  * @file
39  *
40  * Loading and saving libsigrok session files.
41  */
42
43 /**
44  * @addtogroup grp_session
45  *
46  * @{
47  */
48
49 extern struct sr_session *session;
50 extern SR_PRIV struct sr_dev_driver session_driver;
51
52 /** @private */
53 SR_PRIV int sr_sessionfile_check(const char *filename)
54 {
55         struct stat st;
56         struct zip *archive;
57         struct zip_file *zf;
58         struct zip_stat zs;
59         int version, ret;
60         char s[11];
61
62         if (!filename)
63                 return SR_ERR_ARG;
64
65         if (stat(filename, &st) == -1) {
66                 sr_err("Couldn't stat %s: %s", filename, strerror(errno));
67                 return SR_ERR;
68         }
69
70         if (!(archive = zip_open(filename, 0, &ret)))
71                 /* No logging: this can be used just to check if it's
72                  * a sigrok session file or not. */
73                 return SR_ERR;
74
75         /* check "version" */
76         version = 0;
77         if (!(zf = zip_fopen(archive, "version", 0))) {
78                 sr_dbg("Not a sigrok session file: no version found.");
79                 return SR_ERR;
80         }
81         if ((ret = zip_fread(zf, s, 10)) == -1)
82                 return SR_ERR;
83         zip_fclose(zf);
84         s[ret] = 0;
85         version = strtoull(s, NULL, 10);
86         if (version > 2) {
87                 sr_dbg("Cannot handle sigrok session file version %d.", version);
88                 return SR_ERR;
89         }
90         sr_spew("Detected sigrok session file version %d.", version);
91
92         /* read "metadata" */
93         if (zip_stat(archive, "metadata", 0, &zs) == -1) {
94                 sr_dbg("Not a valid sigrok session file.");
95                 return SR_ERR;
96         }
97
98         return SR_OK;
99 }
100
101 /**
102  * Load the session from the specified filename.
103  *
104  * @param filename The name of the session file to load. Must not be NULL.
105  *
106  * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments,
107  *         SR_ERR_MALLOC upon memory allocation errors, or SR_ERR upon
108  *         other errors.
109  */
110 SR_API int sr_session_load(const char *filename)
111 {
112         GKeyFile *kf;
113         GPtrArray *capturefiles;
114         struct zip *archive;
115         struct zip_file *zf;
116         struct zip_stat zs;
117         struct sr_dev_inst *sdi;
118         struct sr_channel *ch;
119         int devcnt, ret, i, j;
120         uint64_t tmp_u64, total_channels, enabled_channels, p;
121         char **sections, **keys, *metafile, *val;
122         char channelname[SR_MAX_CHANNELNAME_LEN + 1];
123
124         if ((ret = sr_sessionfile_check(filename)) != SR_OK)
125                 return ret;
126
127         if (!(archive = zip_open(filename, 0, &ret)))
128                 return SR_ERR;
129
130         if (zip_stat(archive, "metadata", 0, &zs) == -1)
131                 return SR_ERR;
132
133         if (!(metafile = g_try_malloc(zs.size))) {
134                 sr_err("%s: metafile malloc failed", __func__);
135                 return SR_ERR_MALLOC;
136         }
137
138         zf = zip_fopen_index(archive, zs.index, 0);
139         zip_fread(zf, metafile, zs.size);
140         zip_fclose(zf);
141
142         kf = g_key_file_new();
143         if (!g_key_file_load_from_data(kf, metafile, zs.size, 0, NULL)) {
144                 sr_dbg("Failed to parse metadata.");
145                 return SR_ERR;
146         }
147
148         sr_session_new();
149
150         devcnt = 0;
151         capturefiles = g_ptr_array_new_with_free_func(g_free);
152         sections = g_key_file_get_groups(kf, NULL);
153         for (i = 0; sections[i]; i++) {
154                 if (!strcmp(sections[i], "global"))
155                         /* nothing really interesting in here yet */
156                         continue;
157                 if (!strncmp(sections[i], "device ", 7)) {
158                         /* device section */
159                         sdi = NULL;
160                         enabled_channels = total_channels = 0;
161                         keys = g_key_file_get_keys(kf, sections[i], NULL, NULL);
162                         for (j = 0; keys[j]; j++) {
163                                 val = g_key_file_get_string(kf, sections[i], keys[j], NULL);
164                                 if (!strcmp(keys[j], "capturefile")) {
165                                         sdi = sr_dev_inst_new(devcnt, SR_ST_ACTIVE, NULL, NULL, NULL);
166                                         sdi->driver = &session_driver;
167                                         if (devcnt == 0)
168                                                 /* first device, init the driver */
169                                                 sdi->driver->init(NULL);
170                                         sr_dev_open(sdi);
171                                         sr_session_dev_add(sdi);
172                                         sdi->driver->config_set(SR_CONF_SESSIONFILE,
173                                                         g_variant_new_string(filename), sdi, NULL);
174                                         sdi->driver->config_set(SR_CONF_CAPTUREFILE,
175                                                         g_variant_new_string(val), sdi, NULL);
176                                         g_ptr_array_add(capturefiles, val);
177                                 } else if (!strcmp(keys[j], "samplerate")) {
178                                         sr_parse_sizestring(val, &tmp_u64);
179                                         sdi->driver->config_set(SR_CONF_SAMPLERATE,
180                                                         g_variant_new_uint64(tmp_u64), sdi, NULL);
181                                 } else if (!strcmp(keys[j], "unitsize")) {
182                                         tmp_u64 = strtoull(val, NULL, 10);
183                                         sdi->driver->config_set(SR_CONF_CAPTURE_UNITSIZE,
184                                                         g_variant_new_uint64(tmp_u64), sdi, NULL);
185                                 } else if (!strcmp(keys[j], "total probes")) {
186                                         total_channels = strtoull(val, NULL, 10);
187                                         sdi->driver->config_set(SR_CONF_NUM_LOGIC_CHANNELS,
188                                                         g_variant_new_uint64(total_channels), sdi, NULL);
189                                         for (p = 0; p < total_channels; p++) {
190                                                 snprintf(channelname, SR_MAX_CHANNELNAME_LEN, "%" PRIu64, p);
191                                                 if (!(ch = sr_channel_new(p, SR_CHANNEL_LOGIC, TRUE,
192                                                                 channelname)))
193                                                         return SR_ERR;
194                                                 sdi->channels = g_slist_append(sdi->channels, ch);
195                                         }
196                                 } else if (!strncmp(keys[j], "probe", 5)) {
197                                         if (!sdi)
198                                                 continue;
199                                         enabled_channels++;
200                                         tmp_u64 = strtoul(keys[j]+5, NULL, 10);
201                                         /* sr_session_save() */
202                                         sr_dev_channel_name_set(sdi, tmp_u64 - 1, val);
203                                 }
204                         }
205                         g_strfreev(keys);
206                         /* Disable channels not specifically listed. */
207                         if (total_channels)
208                                 for (p = enabled_channels; p < total_channels; p++)
209                                         sr_dev_channel_enable(sdi, p, FALSE);
210                 }
211                 devcnt++;
212         }
213         g_strfreev(sections);
214         g_key_file_free(kf);
215
216         return SR_OK;
217 }
218
219 /**
220  * Save the current session to the specified file.
221  *
222  * @param filename The name of the filename to save the current session as.
223  *                 Must not be NULL.
224  * @param sdi The device instance from which the data was captured.
225  * @param buf The data to be saved.
226  * @param unitsize The number of bytes per sample.
227  * @param units The number of samples.
228  *
229  * @retval SR_OK Success
230  * @retval SR_ERR_ARG Invalid arguments
231  * @retval SR_ERR Other errors
232  *
233  * @since 0.2.0
234  */
235 SR_API int sr_session_save(const char *filename, const struct sr_dev_inst *sdi,
236                 unsigned char *buf, int unitsize, int units)
237 {
238         struct sr_channel *ch;
239         GSList *l;
240         GVariant *gvar;
241         uint64_t samplerate;
242         int cnt, ret;
243         char **channel_names;
244
245         samplerate = 0;
246         if (sr_dev_has_option(sdi, SR_CONF_SAMPLERATE)) {
247                 if (sr_config_get(sdi->driver, sdi, NULL,
248                                         SR_CONF_SAMPLERATE, &gvar) == SR_OK) {
249                         samplerate = g_variant_get_uint64(gvar);
250                         g_variant_unref(gvar);
251                 }
252         }
253
254         channel_names = g_malloc0(sizeof(char *) * (g_slist_length(sdi->channels) + 1));
255         cnt = 0;
256         for (l = sdi->channels; l; l = l->next) {
257                 ch = l->data;
258                 if (ch->type != SR_CHANNEL_LOGIC)
259                         continue;
260                 if (ch->enabled != TRUE)
261                         continue;
262                 if (!ch->name)
263                         continue;
264                 /* Just borrowing the ptr. */
265                 channel_names[cnt++] = ch->name;
266         }
267
268         if ((ret = sr_session_save_init(filename, samplerate, channel_names)) != SR_OK)
269                 return ret;
270
271         ret = sr_session_append(filename, buf, unitsize, units);
272
273         return ret;
274 }
275
276 /**
277  * Initialize a saved session file.
278  *
279  * @param filename The name of the filename to save the current session as.
280  *                 Must not be NULL.
281  * @param samplerate The samplerate to store for this session.
282  * @param channels A NULL-terminated array of strings containing the names
283  * of all the channels active in this session.
284  *
285  * @retval SR_OK Success
286  * @retval SR_ERR_ARG Invalid arguments
287  * @retval SR_ERR Other errors
288  *
289  * @since 0.3.0
290  */
291 SR_API int sr_session_save_init(const char *filename, uint64_t samplerate,
292                 char **channels)
293 {
294         FILE *meta;
295         struct zip *zipfile;
296         struct zip_source *versrc, *metasrc;
297         int tmpfile, cnt, ret, i;
298         char version[1], metafile[32], *s;
299
300         if (!filename) {
301                 sr_err("%s: filename was NULL", __func__);
302                 return SR_ERR_ARG;
303         }
304
305         /* Quietly delete it first, libzip wants replace ops otherwise. */
306         unlink(filename);
307         if (!(zipfile = zip_open(filename, ZIP_CREATE, &ret)))
308                 return SR_ERR;
309
310         /* "version" */
311         version[0] = '2';
312         if (!(versrc = zip_source_buffer(zipfile, version, 1, 0)))
313                 return SR_ERR;
314         if (zip_add(zipfile, "version", versrc) == -1) {
315                 sr_info("error saving version into zipfile: %s",
316                         zip_strerror(zipfile));
317                 return SR_ERR;
318         }
319
320         /* init "metadata" */
321         strcpy(metafile, "sigrok-meta-XXXXXX");
322         if ((tmpfile = g_mkstemp(metafile)) == -1)
323                 return SR_ERR;
324         close(tmpfile);
325         meta = g_fopen(metafile, "wb");
326         fprintf(meta, "[global]\n");
327         fprintf(meta, "sigrok version = %s\n", PACKAGE_VERSION);
328
329         /* metadata */
330         fprintf(meta, "[device 1]\n");
331
332         /* metadata */
333         fprintf(meta, "capturefile = logic-1\n");
334         cnt = 0;
335         for (i = 0; channels[i]; i++)
336                 cnt++;
337         fprintf(meta, "total probes = %d\n", cnt);
338         s = sr_samplerate_string(samplerate);
339         fprintf(meta, "samplerate = %s\n", s);
340         g_free(s);
341
342         for (i = 0; channels[i]; i++)
343                 fprintf(meta, "probe%d = %s\n", i + 1, channels[i]);
344
345         fclose(meta);
346
347         if (!(metasrc = zip_source_file(zipfile, metafile, 0, -1))) {
348                 unlink(metafile);
349                 return SR_ERR;
350         }
351         if (zip_add(zipfile, "metadata", metasrc) == -1) {
352                 unlink(metafile);
353                 return SR_ERR;
354         }
355
356         if ((ret = zip_close(zipfile)) == -1) {
357                 sr_info("error saving zipfile: %s", zip_strerror(zipfile));
358                 unlink(metafile);
359                 return SR_ERR;
360         }
361
362         unlink(metafile);
363
364         return SR_OK;
365 }
366
367 /**
368  * Append data to an existing session file.
369  *
370  * The session file must have been created with sr_session_save_init()
371  * or sr_session_save() beforehand.
372  *
373  * @param filename The name of the filename to append to. Must not be NULL.
374  * @param buf The data to be appended.
375  * @param unitsize The number of bytes per sample.
376  * @param units The number of samples.
377  *
378  * @retval SR_OK Success
379  * @retval SR_ERR_ARG Invalid arguments
380  * @retval SR_ERR Other errors
381  *
382  * @since 0.3.0
383  */
384 SR_API int sr_session_append(const char *filename, unsigned char *buf,
385                 int unitsize, int units)
386 {
387         struct zip *archive;
388         struct zip_source *logicsrc;
389         zip_int64_t num_files;
390         struct zip_file *zf;
391         struct zip_stat zs;
392         struct zip_source *metasrc;
393         GKeyFile *kf;
394         GError *error;
395         gsize len;
396         int chunk_num, next_chunk_num, tmpfile, ret, i;
397         const char *entry_name;
398         char *metafile, tmpname[32], chunkname[16];
399
400         if ((ret = sr_sessionfile_check(filename)) != SR_OK)
401                 return ret;
402
403         if (!(archive = zip_open(filename, 0, &ret)))
404                 return SR_ERR;
405
406         if (zip_stat(archive, "metadata", 0, &zs) == -1)
407                 return SR_ERR;
408
409         metafile = g_malloc(zs.size);
410         zf = zip_fopen_index(archive, zs.index, 0);
411         zip_fread(zf, metafile, zs.size);
412         zip_fclose(zf);
413
414         /*
415          * If the file was only initialized but doesn't yet have any
416          * data it in, it won't have a unitsize field in metadata yet.
417          */
418         error = NULL;
419         kf = g_key_file_new();
420         if (!g_key_file_load_from_data(kf, metafile, zs.size, 0, &error)) {
421                 sr_err("Failed to parse metadata: %s.", error->message);
422                 return SR_ERR;
423         }
424         g_free(metafile);
425         tmpname[0] = '\0';
426         if (!g_key_file_has_key(kf, "device 1", "unitsize", &error)) {
427                 if (error && error->code != G_KEY_FILE_ERROR_KEY_NOT_FOUND) {
428                         sr_err("Failed to check unitsize key: %s", error ? error->message : "?");
429                         return SR_ERR;
430                 }
431                 /* Add unitsize field. */
432                 g_key_file_set_integer(kf, "device 1", "unitsize", unitsize);
433                 metafile = g_key_file_to_data(kf, &len, &error);
434                 strcpy(tmpname, "sigrok-meta-XXXXXX");
435                 if ((tmpfile = g_mkstemp(tmpname)) == -1)
436                         return SR_ERR;
437                 if (write(tmpfile, metafile, len) < 0) {
438                         sr_dbg("Failed to create new metadata: %s", strerror(errno));
439                         g_free(metafile);
440                         unlink(tmpname);
441                         return SR_ERR;
442                 }
443                 close(tmpfile);
444                 if (!(metasrc = zip_source_file(archive, tmpname, 0, -1))) {
445                         sr_err("Failed to create zip source for metadata.");
446                         g_free(metafile);
447                         unlink(tmpname);
448                         return SR_ERR;
449                 }
450                 if (zip_replace(archive, zs.index, metasrc) == -1) {
451                         sr_err("Failed to replace metadata file.");
452                         g_free(metafile);
453                         unlink(tmpname);
454                         return SR_ERR;
455                 }
456                 g_free(metafile);
457         }
458         g_key_file_free(kf);
459
460         next_chunk_num = 1;
461         num_files = zip_get_num_entries(archive, 0);
462         for (i = 0; i < num_files; i++) {
463                 entry_name = zip_get_name(archive, i, 0);
464                 if (strncmp(entry_name, "logic-1", 7))
465                         continue;
466                 if (strlen(entry_name) == 7) {
467                         /* This file has no extra chunks, just a single "logic-1".
468                          * Rename it to "logic-1-1" * and continue with chunk 2. */
469                         if (zip_rename(archive, i, "logic-1-1") == -1) {
470                                 sr_err("Failed to rename 'logic-1' to 'logic-1-1'.");
471                                 unlink(tmpname);
472                                 return SR_ERR;
473                         }
474                         next_chunk_num = 2;
475                         break;
476                 } else if (strlen(entry_name) > 8 && entry_name[7] == '-') {
477                         chunk_num = strtoull(entry_name + 8, NULL, 10);
478                         if (chunk_num >= next_chunk_num)
479                                 next_chunk_num = chunk_num + 1;
480                 }
481         }
482         snprintf(chunkname, 15, "logic-1-%d", next_chunk_num);
483         if (!(logicsrc = zip_source_buffer(archive, buf, units * unitsize, FALSE))) {
484                 unlink(tmpname);
485                 return SR_ERR;
486         }
487         if (zip_add(archive, chunkname, logicsrc) == -1) {
488                 unlink(tmpname);
489                 return SR_ERR;
490         }
491         if ((ret = zip_close(archive)) == -1) {
492                 sr_info("error saving session file: %s", zip_strerror(archive));
493                 unlink(tmpname);
494                 return SR_ERR;
495         }
496         unlink(tmpname);
497
498         return SR_OK;
499 }
500
501 /** @} */