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