libsigrok/session_file.c

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/*
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* This file is part of the libsigrok project.
*
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* Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <zip.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <glib.h>
#include <glib/gstdio.h>
#include "config.h" /* Needed for PACKAGE_VERSION and others. */
#include "libsigrok.h"
#include "libsigrok-internal.h"
#define LOG_PREFIX "session-file"
/**
* @file
*
* Loading and saving libsigrok session files.
*/
/**
* @addtogroup grp_session
*
* @{
*/
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extern struct sr_session *session;
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extern SR_PRIV struct sr_dev_driver session_driver;
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/** @private */
SR_PRIV int sr_sessionfile_check(const char *filename)
{
struct stat st;
struct zip *archive;
struct zip_file *zf;
struct zip_stat zs;
int version, ret;
char s[11];
if (!filename)
return SR_ERR_ARG;
if (stat(filename, &st) == -1) {
sr_err("Couldn't stat %s: %s", filename, strerror(errno));
return SR_ERR;
}
if (!(archive = zip_open(filename, 0, &ret)))
/* No logging: this can be used just to check if it's
* a sigrok session file or not. */
return SR_ERR;
/* check "version" */
version = 0;
if (!(zf = zip_fopen(archive, "version", 0))) {
sr_dbg("Not a sigrok session file: no version found.");
return SR_ERR;
}
if ((ret = zip_fread(zf, s, 10)) == -1)
return SR_ERR;
zip_fclose(zf);
s[ret] = 0;
version = strtoull(s, NULL, 10);
if (version > 2) {
sr_dbg("Cannot handle sigrok session file version %d.", version);
return SR_ERR;
}
sr_spew("Detected sigrok session file version %d.", version);
/* read "metadata" */
if (zip_stat(archive, "metadata", 0, &zs) == -1) {
sr_dbg("Not a valid sigrok session file.");
return SR_ERR;
}
return SR_OK;
}
/**
* Load the session from the specified filename.
*
* @param filename The name of the session file to load. Must not be NULL.
*
* @return SR_OK upon success, SR_ERR_ARG upon invalid arguments,
* SR_ERR_MALLOC upon memory allocation errors, or SR_ERR upon
* other errors.
*/
SR_API int sr_session_load(const char *filename)
{
GKeyFile *kf;
GPtrArray *capturefiles;
struct zip *archive;
struct zip_file *zf;
struct zip_stat zs;
struct sr_dev_inst *sdi;
struct sr_probe *probe;
int ret, probenum, devcnt, i, j;
uint64_t tmp_u64, total_probes, enabled_probes, p;
char **sections, **keys, *metafile, *val;
char probename[SR_MAX_PROBENAME_LEN + 1];
if ((ret = sr_sessionfile_check(filename)) != SR_OK)
return ret;
if (!(archive = zip_open(filename, 0, &ret)))
return SR_ERR;
if (zip_stat(archive, "metadata", 0, &zs) == -1)
return SR_ERR;
if (!(metafile = g_try_malloc(zs.size))) {
sr_err("%s: metafile malloc failed", __func__);
return SR_ERR_MALLOC;
}
zf = zip_fopen_index(archive, zs.index, 0);
zip_fread(zf, metafile, zs.size);
zip_fclose(zf);
kf = g_key_file_new();
if (!g_key_file_load_from_data(kf, metafile, zs.size, 0, NULL)) {
sr_dbg("Failed to parse metadata.");
return SR_ERR;
}
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sr_session_new();
devcnt = 0;
capturefiles = g_ptr_array_new_with_free_func(g_free);
sections = g_key_file_get_groups(kf, NULL);
for (i = 0; sections[i]; i++) {
if (!strcmp(sections[i], "global"))
/* nothing really interesting in here yet */
continue;
if (!strncmp(sections[i], "device ", 7)) {
/* device section */
sdi = NULL;
enabled_probes = total_probes = 0;
keys = g_key_file_get_keys(kf, sections[i], NULL, NULL);
for (j = 0; keys[j]; j++) {
val = g_key_file_get_string(kf, sections[i], keys[j], NULL);
if (!strcmp(keys[j], "capturefile")) {
sdi = sr_dev_inst_new(devcnt, SR_ST_ACTIVE, NULL, NULL, NULL);
sdi->driver = &session_driver;
if (devcnt == 0)
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/* first device, init the driver */
sdi->driver->init(NULL);
sr_dev_open(sdi);
sr_session_dev_add(sdi);
sdi->driver->config_set(SR_CONF_SESSIONFILE,
g_variant_new_string(filename), sdi, NULL);
sdi->driver->config_set(SR_CONF_CAPTUREFILE,
g_variant_new_string(val), sdi, NULL);
g_ptr_array_add(capturefiles, val);
} else if (!strcmp(keys[j], "samplerate")) {
sr_parse_sizestring(val, &tmp_u64);
sdi->driver->config_set(SR_CONF_SAMPLERATE,
g_variant_new_uint64(tmp_u64), sdi, NULL);
} else if (!strcmp(keys[j], "unitsize")) {
tmp_u64 = strtoull(val, NULL, 10);
sdi->driver->config_set(SR_CONF_CAPTURE_UNITSIZE,
g_variant_new_uint64(tmp_u64), sdi, NULL);
} else if (!strcmp(keys[j], "total probes")) {
total_probes = strtoull(val, NULL, 10);
sdi->driver->config_set(SR_CONF_NUM_LOGIC_PROBES,
g_variant_new_uint64(total_probes), sdi, NULL);
for (p = 0; p < total_probes; p++) {
snprintf(probename, SR_MAX_PROBENAME_LEN, "%" PRIu64, p);
if (!(probe = sr_probe_new(p, SR_PROBE_LOGIC, TRUE,
probename)))
return SR_ERR;
sdi->probes = g_slist_append(sdi->probes, probe);
}
} else if (!strncmp(keys[j], "probe", 5)) {
if (!sdi)
continue;
enabled_probes++;
tmp_u64 = strtoul(keys[j]+5, NULL, 10);
/* sr_session_save() */
sr_dev_probe_name_set(sdi, tmp_u64 - 1, val);
} else if (!strncmp(keys[j], "trigger", 7)) {
probenum = strtoul(keys[j]+7, NULL, 10);
sr_dev_trigger_set(sdi, probenum, val);
}
}
g_strfreev(keys);
/* Disable probes not specifically listed. */
if (total_probes)
for (p = enabled_probes; p < total_probes; p++)
sr_dev_probe_enable(sdi, p, FALSE);
}
devcnt++;
}
g_strfreev(sections);
g_key_file_free(kf);
return SR_OK;
}
/**
* Save the current session to the specified file.
*
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* @param filename The name of the filename to save the current session as.
* Must not be NULL.
* @param sdi The device instance from which the data was captured.
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* @param buf The data to be saved.
* @param unitsize The number of bytes per sample.
* @param units The number of samples.
*
* @retval SR_OK Success
* @retval SR_ERR_ARG Invalid arguments
* @retval SR_ERR Other errors
*/
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SR_API int sr_session_save(const char *filename, const struct sr_dev_inst *sdi,
unsigned char *buf, int unitsize, int units)
{
struct sr_probe *probe;
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GSList *l;
GVariant *gvar;
uint64_t samplerate;
int cnt, ret;
char **probe_names;
samplerate = 0;
if (sr_dev_has_option(sdi, SR_CONF_SAMPLERATE)) {
if (sr_config_get(sdi->driver, sdi, NULL,
SR_CONF_SAMPLERATE, &gvar) == SR_OK) {
samplerate = g_variant_get_uint64(gvar);
g_variant_unref(gvar);
}
}
probe_names = g_malloc0(sizeof(char *) * (g_slist_length(sdi->probes) + 1));
cnt = 0;
for (l = sdi->probes; l; l = l->next) {
probe = l->data;
if (probe->type != SR_PROBE_LOGIC)
continue;
if (probe->enabled != TRUE)
continue;
if (!probe->name)
continue;
/* Just borrowing the ptr. */
probe_names[cnt++] = probe->name;
}
if ((ret = sr_session_save_init(filename, samplerate, probe_names)) != SR_OK)
return ret;
ret = sr_session_append(filename, buf, unitsize, units);
return ret;
}
/**
* Initialize a saved session file.
*
* @param filename The name of the filename to save the current session as.
* Must not be NULL.
* @param samplerate The samplerate to store for this session.
* @param probes A NULL-terminated array of strings containing the names
* of all the probes active in this session.
*
* @retval SR_OK Success
* @retval SR_ERR_ARG Invalid arguments
* @retval SR_ERR Other errors
*/
SR_API int sr_session_save_init(const char *filename, uint64_t samplerate,
char **probes)
{
FILE *meta;
struct zip *zipfile;
struct zip_source *versrc, *metasrc;
int tmpfile, cnt, ret, i;
char version[1], metafile[32], *s;
if (!filename) {
sr_err("%s: filename was NULL", __func__);
return SR_ERR_ARG;
}
/* Quietly delete it first, libzip wants replace ops otherwise. */
unlink(filename);
if (!(zipfile = zip_open(filename, ZIP_CREATE, &ret)))
return SR_ERR;
/* "version" */
version[0] = '2';
if (!(versrc = zip_source_buffer(zipfile, version, 1, 0)))
return SR_ERR;
if (zip_add(zipfile, "version", versrc) == -1) {
sr_info("error saving version into zipfile: %s",
zip_strerror(zipfile));
return SR_ERR;
}
/* init "metadata" */
strcpy(metafile, "sigrok-meta-XXXXXX");
if ((tmpfile = g_mkstemp(metafile)) == -1)
return SR_ERR;
close(tmpfile);
meta = g_fopen(metafile, "wb");
fprintf(meta, "[global]\n");
fprintf(meta, "sigrok version = %s\n", PACKAGE_VERSION);
/* metadata */
fprintf(meta, "[device 1]\n");
/* metadata */
fprintf(meta, "capturefile = logic-1\n");
cnt = 0;
for (i = 0; probes[i]; i++)
cnt++;
fprintf(meta, "total probes = %d\n", cnt);
s = sr_samplerate_string(samplerate);
fprintf(meta, "samplerate = %s\n", s);
g_free(s);
for (i = 0; probes[i]; i++)
fprintf(meta, "probe%d = %s\n", i + 1, probes[i]);
fclose(meta);
if (!(metasrc = zip_source_file(zipfile, metafile, 0, -1))) {
unlink(metafile);
return SR_ERR;
}
if (zip_add(zipfile, "metadata", metasrc) == -1) {
unlink(metafile);
return SR_ERR;
}
if ((ret = zip_close(zipfile)) == -1) {
sr_info("error saving zipfile: %s", zip_strerror(zipfile));
unlink(metafile);
return SR_ERR;
}
unlink(metafile);
return SR_OK;
}
/**
* Append data to an existing session file.
*
* The session file must have been created with sr_session_save_init()
* or sr_session_save() beforehand.
*
* @param filename The name of the filename to append to. Must not be NULL.
* @param buf The data to be appended.
* @param unitsize The number of bytes per sample.
* @param units The number of samples.
*
* @retval SR_OK Success
* @retval SR_ERR_ARG Invalid arguments
* @retval SR_ERR Other errors
*/
SR_API int sr_session_append(const char *filename, unsigned char *buf,
int unitsize, int units)
{
struct zip *archive;
struct zip_source *logicsrc;
zip_int64_t num_files;
struct zip_file *zf;
struct zip_stat zs;
struct zip_source *metasrc;
GKeyFile *kf;
GError *error;
gsize len;
int chunk_num, next_chunk_num, tmpfile, ret, i;
const char *entry_name;
char *metafile, tmpname[32], chunkname[16];
if ((ret = sr_sessionfile_check(filename)) != SR_OK)
return ret;
if (!(archive = zip_open(filename, 0, &ret)))
return SR_ERR;
if (zip_stat(archive, "metadata", 0, &zs) == -1)
return SR_ERR;
metafile = g_malloc(zs.size);
zf = zip_fopen_index(archive, zs.index, 0);
zip_fread(zf, metafile, zs.size);
zip_fclose(zf);
/*
* If the file was only initialized but doesn't yet have any
* data it in, it won't have a unitsize field in metadata yet.
*/
error = NULL;
kf = g_key_file_new();
if (!g_key_file_load_from_data(kf, metafile, zs.size, 0, &error)) {
sr_err("Failed to parse metadata: %s.", error->message);
return SR_ERR;
}
g_free(metafile);
tmpname[0] = '\0';
if (!g_key_file_has_key(kf, "device 1", "unitsize", &error)) {
if (error && error->code != G_KEY_FILE_ERROR_KEY_NOT_FOUND) {
sr_err("Failed to check unitsize key: %s", error ? error->message : "?");
return SR_ERR;
}
/* Add unitsize field. */
g_key_file_set_integer(kf, "device 1", "unitsize", unitsize);
metafile = g_key_file_to_data(kf, &len, &error);
strcpy(tmpname, "sigrok-meta-XXXXXX");
if ((tmpfile = g_mkstemp(tmpname)) == -1)
return SR_ERR;
if (write(tmpfile, metafile, len) < 0) {
sr_dbg("Failed to create new metadata: %s", strerror(errno));
g_free(metafile);
unlink(tmpname);
return SR_ERR;
}
close(tmpfile);
if (!(metasrc = zip_source_file(archive, tmpname, 0, -1))) {
sr_err("Failed to create zip source for metadata.");
g_free(metafile);
unlink(tmpname);
return SR_ERR;
}
if (zip_replace(archive, zs.index, metasrc) == -1) {
sr_err("Failed to replace metadata file.");
g_free(metafile);
unlink(tmpname);
return SR_ERR;
}
g_free(metafile);
}
g_key_file_free(kf);
next_chunk_num = 1;
num_files = zip_get_num_entries(archive, 0);
for (i = 0; i < num_files; i++) {
entry_name = zip_get_name(archive, i, 0);
if (strncmp(entry_name, "logic-1", 7))
continue;
if (strlen(entry_name) == 7) {
/* This file has no extra chunks, just a single "logic-1".
* Rename it to "logic-1-1" * and continue with chunk 2. */
if (zip_rename(archive, i, "logic-1-1") == -1) {
sr_err("Failed to rename 'logic-1' to 'logic-1-1'.");
unlink(tmpname);
return SR_ERR;
}
next_chunk_num = 2;
break;
} else if (strlen(entry_name) > 8 && entry_name[7] == '-') {
chunk_num = strtoull(entry_name + 8, NULL, 10);
if (chunk_num >= next_chunk_num)
next_chunk_num = chunk_num + 1;
}
}
snprintf(chunkname, 15, "logic-1-%d", next_chunk_num);
if (!(logicsrc = zip_source_buffer(archive, buf, units * unitsize, FALSE))) {
unlink(tmpname);
return SR_ERR;
}
if (zip_add(archive, chunkname, logicsrc) == -1) {
unlink(tmpname);
return SR_ERR;
}
if ((ret = zip_close(archive)) == -1) {
sr_info("error saving session file: %s", zip_strerror(archive));
unlink(tmpname);
return SR_ERR;
}
unlink(tmpname);
return SR_OK;
}
/** @} */