src/session_file.c

   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 <string.h>
  22 #include <stdlib.h>
  23 #include <zip.h>
  24 #include <errno.h>
  25 #include <glib.h>
  26 #include <glib/gstdio.h>
  27 #include <libsigrok/libsigrok.h>
  28 #include "libsigrok-internal.h"
  29
  30 /** @cond PRIVATE */
  31 #define LOG_PREFIX "session-file"
  32 /** @endcond */
  33
  34 /**
  35  * @file
  36  *
  37  * Loading and saving libsigrok session files.
  38  */
  39
  40 /**
  41  * @addtogroup grp_session
  42  *
  43  * @{
  44  */
  45
  46 extern SR_PRIV struct sr_dev_driver session_driver;
  47 static int session_driver_initialized = 0;
  48
  49 #if !HAVE_ZIP_DISCARD
  50 /* Replacement for zip_discard() if it isn't available.
  51  */
  52 SR_PRIV void sr_zip_discard(struct zip *archive)
  53 {
  54         if (zip_unchange_all(archive) < 0 || zip_close(archive) < 0)
  55                 sr_err("Failed to discard ZIP archive: %s", zip_strerror(archive));
  56 }
  57 #endif
  58
  59 /** Read metadata entries from a session archive.
  60  * @param[in] archive An open ZIP archive.
  61  * @param[in] entry Stat buffer filled in for the metadata archive member.
  62  * @return A new key/value store containing the session metadata.
  63  */
  64 SR_PRIV GKeyFile *sr_sessionfile_read_metadata(struct zip *archive,
  65                         const struct zip_stat *entry)
  66 {
  67         GKeyFile *keyfile;
  68         GError *error;
  69         struct zip_file *zf;
  70         char *metabuf;
  71         int metalen;
  72
  73         if (entry->size > G_MAXINT || !(metabuf = g_try_malloc(entry->size))) {
  74                 sr_err("Metadata buffer allocation failed.");
  75                 return NULL;
  76         }
  77         zf = zip_fopen_index(archive, entry->index, 0);
  78         if (!zf) {
  79                 sr_err("Failed to open metadata: %s", zip_strerror(archive));
  80                 g_free(metabuf);
  81                 return NULL;
  82         }
  83         metalen = zip_fread(zf, metabuf, entry->size);
  84         if (metalen < 0) {
  85                 sr_err("Failed to read metadata: %s", zip_file_strerror(zf));
  86                 zip_fclose(zf);
  87                 g_free(metabuf);
  88                 return NULL;
  89         }
  90         zip_fclose(zf);
  91
  92         keyfile = g_key_file_new();
  93         error = NULL;
  94         g_key_file_load_from_data(keyfile, metabuf, metalen,
  95                         G_KEY_FILE_NONE, &error);
  96         g_free(metabuf);
  97
  98         if (error) {
  99                 sr_err("Failed to parse metadata: %s", error->message);
 100                 g_error_free(error);
 101                 g_key_file_free(keyfile);
 102                 return NULL;
 103         }
 104         return keyfile;
 105 }
 106
 107 /** @private */
 108 SR_PRIV int sr_sessionfile_check(const char *filename)
 109 {
 110         struct zip *archive;
 111         struct zip_file *zf;
 112         struct zip_stat zs;
 113         uint64_t version;
 114         int ret;
 115         char s[11];
 116
 117         if (!filename)
 118                 return SR_ERR_ARG;
 119
 120         if (!g_file_test(filename, G_FILE_TEST_IS_REGULAR)) {
 121                 sr_err("Not a regular file: %s.", filename);
 122                 return SR_ERR;
 123         }
 124
 125         if (!(archive = zip_open(filename, 0, NULL)))
 126                 /* No logging: this can be used just to check if it's
 127                  * a sigrok session file or not. */
 128                 return SR_ERR;
 129
 130         /* check "version" */
 131         if (!(zf = zip_fopen(archive, "version", 0))) {
 132                 sr_dbg("Not a sigrok session file: no version found.");
 133                 zip_discard(archive);
 134                 return SR_ERR;
 135         }
 136         ret = zip_fread(zf, s, sizeof(s) - 1);
 137         if (ret < 0) {
 138                 sr_err("Failed to read version file: %s",
 139                         zip_file_strerror(zf));
 140                 zip_fclose(zf);
 141                 zip_discard(archive);
 142                 return SR_ERR;
 143         }
 144         zip_fclose(zf);
 145         s[ret] = '\0';
 146         version = g_ascii_strtoull(s, NULL, 10);
 147         if (version == 0 || version > 2) {
 148                 sr_dbg("Cannot handle sigrok session file version %" PRIu64 ".",
 149                         version);
 150                 zip_discard(archive);
 151                 return SR_ERR;
 152         }
 153         sr_spew("Detected sigrok session file version %" PRIu64 ".", version);
 154
 155         /* read "metadata" */
 156         if (zip_stat(archive, "metadata", 0, &zs) < 0) {
 157                 sr_dbg("Not a valid sigrok session file.");
 158                 zip_discard(archive);
 159                 return SR_ERR;
 160         }
 161         zip_discard(archive);
 162
 163         return SR_OK;
 164 }
 165
 166 /**
 167  * Load the session from the specified filename.
 168  *
 169  * @param ctx The context in which to load the session.
 170  * @param filename The name of the session file to load.
 171  * @param session The session to load the file into.
 172  *
 173  * @retval SR_OK Success
 174  * @retval SR_ERR_MALLOC Memory allocation error
 175  * @retval SR_ERR_DATA Malformed session file
 176  * @retval SR_ERR This is not a session file
 177  */
 178 SR_API int sr_session_load(struct sr_context *ctx, const char *filename,
 179                 struct sr_session **session)
 180 {
 181         GKeyFile *kf;
 182         GError *error;
 183         struct zip *archive;
 184         struct zip_stat zs;
 185         struct sr_dev_inst *sdi;
 186         struct sr_channel *ch;
 187         int ret, i, j;
 188         uint64_t tmp_u64;
 189         int total_channels, k;
 190         int unitsize;
 191         char **sections, **keys, *val;
 192         char channelname[SR_MAX_CHANNELNAME_LEN + 1];
 193
 194         if ((ret = sr_sessionfile_check(filename)) != SR_OK)
 195                 return ret;
 196
 197         if (!(archive = zip_open(filename, 0, NULL)))
 198                 return SR_ERR;
 199
 200         if (zip_stat(archive, "metadata", 0, &zs) < 0) {
 201                 zip_discard(archive);
 202                 return SR_ERR;
 203         }
 204         kf = sr_sessionfile_read_metadata(archive, &zs);
 205         zip_discard(archive);
 206         if (!kf)
 207                 return SR_ERR_DATA;
 208
 209         if ((ret = sr_session_new(ctx, session)) != SR_OK) {
 210                 g_key_file_free(kf);
 211                 return ret;
 212         }
 213
 214         error = NULL;
 215         ret = SR_OK;
 216         sections = g_key_file_get_groups(kf, NULL);
 217         for (i = 0; sections[i] && ret == SR_OK; i++) {
 218                 if (!strcmp(sections[i], "global"))
 219                         /* nothing really interesting in here yet */
 220                         continue;
 221                 if (!strncmp(sections[i], "device ", 7)) {
 222                         /* device section */
 223                         sdi = NULL;
 224                         keys = g_key_file_get_keys(kf, sections[i], NULL, NULL);
 225                         for (j = 0; keys[j]; j++) {
 226                                 if (!strcmp(keys[j], "capturefile")) {
 227                                         val = g_key_file_get_string(kf, sections[i],
 228                                                         keys[j], &error);
 229                                         if (!val) {
 230                                                 ret = SR_ERR_DATA;
 231                                                 break;
 232                                         }
 233                                         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 234                                         sdi->driver = &session_driver;
 235                                         sdi->status = SR_ST_ACTIVE;
 236                                         if (!session_driver_initialized) {
 237                                                 /* first device, init the driver */
 238                                                 session_driver_initialized = 1;
 239                                                 sdi->driver->init(sdi->driver, NULL);
 240                                         }
 241                                         sr_dev_open(sdi);
 242                                         sr_session_dev_add(*session, sdi);
 243                                         (*session)->owned_devs = g_slist_append(
 244                                                         (*session)->owned_devs, sdi);
 245                                         sr_config_set(sdi, NULL, SR_CONF_SESSIONFILE,
 246                                                         g_variant_new_string(filename));
 247                                         sr_config_set(sdi, NULL, SR_CONF_CAPTUREFILE,
 248                                                         g_variant_new_string(val));
 249                                         g_free(val);
 250                                 } else if (!strcmp(keys[j], "samplerate")) {
 251                                         val = g_key_file_get_string(kf, sections[i],
 252                                                         keys[j], &error);
 253                                         if (!sdi || !val || sr_parse_sizestring(val,
 254                                                                 &tmp_u64) != SR_OK) {
 255                                                 g_free(val);
 256                                                 ret = SR_ERR_DATA;
 257                                                 break;
 258                                         }
 259                                         g_free(val);
 260                                         sr_config_set(sdi, NULL, SR_CONF_SAMPLERATE,
 261                                                         g_variant_new_uint64(tmp_u64));
 262                                 } else if (!strcmp(keys[j], "unitsize")) {
 263                                         unitsize = g_key_file_get_integer(kf, sections[i],
 264                                                         keys[j], &error);
 265                                         if (!sdi || unitsize <= 0 || error) {
 266                                                 ret = SR_ERR_DATA;
 267                                                 break;
 268                                         }
 269                                         sr_config_set(sdi, NULL, SR_CONF_CAPTURE_UNITSIZE,
 270                                                         g_variant_new_uint64(unitsize));
 271                                 } else if (!strcmp(keys[j], "total probes")) {
 272                                         total_channels = g_key_file_get_integer(kf,
 273                                                         sections[i], keys[j], &error);
 274                                         if (!sdi || total_channels < 0 || error) {
 275                                                 ret = SR_ERR_DATA;
 276                                                 break;
 277                                         }
 278                                         sr_config_set(sdi, NULL, SR_CONF_NUM_LOGIC_CHANNELS,
 279                                                         g_variant_new_int32(total_channels));
 280                                         for (k = 0; k < total_channels; k++) {
 281                                                 g_snprintf(channelname, sizeof channelname,
 282                                                                 "%d", k);
 283                                                 sr_channel_new(sdi, k, SR_CHANNEL_LOGIC,
 284                                                                 FALSE, channelname);
 285                                         }
 286                                 } else if (!strncmp(keys[j], "probe", 5)) {
 287                                         tmp_u64 = g_ascii_strtoull(keys[j]+5, NULL, 10);
 288                                         if (!sdi || tmp_u64 == 0 || tmp_u64 > G_MAXINT) {
 289                                                 ret = SR_ERR_DATA;
 290                                                 break;
 291                                         }
 292                                         ch = g_slist_nth_data(sdi->channels, tmp_u64 - 1);
 293                                         if (!ch) {
 294                                                 ret = SR_ERR_DATA;
 295                                                 break;
 296                                         }
 297                                         val = g_key_file_get_string(kf, sections[i],
 298                                                         keys[j], &error);
 299                                         if (!val) {
 300                                                 ret = SR_ERR_DATA;
 301                                                 break;
 302                                         }
 303                                         /* sr_session_save() */
 304                                         sr_dev_channel_name_set(ch, val);
 305                                         g_free(val);
 306                                         sr_dev_channel_enable(ch, TRUE);
 307                                 }
 308                         }
 309                         g_strfreev(keys);
 310                 }
 311         }
 312         g_strfreev(sections);
 313         g_key_file_free(kf);
 314
 315         if (error) {
 316                 sr_err("Failed to parse metadata: %s", error->message);
 317                 g_error_free(error);
 318         }
 319         return ret;
 320 }
 321
 322 /** @} */