libsigrok/input/csv.c

869 lines
20 KiB
C

/*
* This file is part of the libsigrok project.
*
* Copyright (C) 2013 Marc Schink <sigrok-dev@marcschink.de>
*
* 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 <stdlib.h>
#include <string.h>
#include <glib.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#define LOG_PREFIX "input/csv"
/*
* The CSV input module has the following options:
*
* single-column: Specifies the column number which stores the sample data for
* single column mode and enables single column mode. Multi
* column mode is used if this parameter is omitted.
*
* numprobes: Specifies the number of probes to use. In multi column mode
* the number of probes are the number of columns and in single
* column mode the number of bits (LSB first) beginning at
* 'first-probe'.
*
* delimiter: Specifies the delimiter for columns. Must be at least one
* character. Comma is used as default delimiter.
*
* format: Specifies the format of the sample data in single column mode.
* Available formats are: 'bin', 'hex' and 'oct'. The binary
* format is used by default. This option has no effect in multi
* column mode.
*
* comment: Specifies the prefix character(s) for comments. No prefix
* characters are used by default which disables removing of
* comments.
*
* samplerate: Samplerate which the sample data was captured with. Default
* value is 0.
*
* first-probe: Column number of the first probe in multi column mode and
* position of the bit for the first probe in single column mode.
* Default value is 0.
*
* header: Determines if the first line should be treated as header
* and used for probe names in multi column mode. Empty header
* names will be replaced by the probe number. If enabled in
* single column mode the first line will be skipped. Usage of
* header is disabled by default.
*
* startline: Line number to start processing sample data. Must be greater
* than 0. The default line number to start processing is 1.
*/
/* Single column formats. */
enum {
FORMAT_BIN,
FORMAT_HEX,
FORMAT_OCT
};
struct context {
/* Current selected samplerate. */
uint64_t samplerate;
/* Number of probes. */
gsize num_probes;
/* Column delimiter character(s). */
GString *delimiter;
/* Comment prefix character(s). */
GString *comment;
/* Determines if sample data is stored in multiple columns. */
gboolean multi_column_mode;
/* Column number of the sample data in single column mode. */
gsize single_column;
/*
* Number of the first column to parse. Equivalent to the number of the
* first probe in multi column mode and the single column number in
* single column mode.
*/
gsize first_column;
/*
* Column number of the first probe in multi column mode and position of
* the bit for the first probe in single column mode.
*/
gsize first_probe;
/* Line number to start processing. */
gsize start_line;
/*
* Determines if the first line should be treated as header and used for
* probe names in multi column mode.
*/
gboolean header;
/* Format sample data is stored in single column mode. */
int format;
/* Size of the sample buffer. */
gsize sample_buffer_size;
/* Buffer to store sample data. */
uint8_t *sample_buffer;
GIOChannel *channel;
/* Buffer for the current line. */
GString *buffer;
/* Current line number. */
gsize line_number;
};
static int format_match(const char *filename)
{
if (!filename) {
sr_err("%s: filename was NULL.", __func__);
return FALSE;
}
if (!g_file_test(filename, G_FILE_TEST_EXISTS)) {
sr_err("Input file '%s' does not exist.", filename);
return FALSE;
}
if (!g_file_test(filename, G_FILE_TEST_IS_REGULAR)) {
sr_err("Input file '%s' not a regular file.", filename);
return FALSE;
}
return TRUE;
}
static void free_context(struct context *ctx)
{
if (!ctx)
return;
if (ctx->delimiter)
g_string_free(ctx->delimiter, TRUE);
if (ctx->comment)
g_string_free(ctx->comment, TRUE);
if (ctx->channel) {
g_io_channel_shutdown(ctx->channel, FALSE, NULL);
g_io_channel_unref(ctx->channel);
}
if (ctx->sample_buffer)
g_free(ctx->sample_buffer);
if (ctx->buffer)
g_string_free(ctx->buffer, TRUE);
g_free(ctx);
}
static void strip_comment(GString *string, const GString *prefix)
{
char *ptr;
if (!prefix->len)
return;
if (!(ptr = strstr(string->str, prefix->str)))
return;
g_string_truncate(string, ptr - string->str);
}
static int parse_binstr(const char *str, struct context *ctx)
{
gsize i, j, length;
length = strlen(str);
if (!length) {
sr_err("Column %zu in line %zu is empty.", ctx->single_column,
ctx->line_number);
return SR_ERR;
}
/* Clear buffer in order to set bits only. */
memset(ctx->sample_buffer, 0, (ctx->num_probes + 7) >> 3);
i = ctx->first_probe;
for (j = 0; i < length && j < ctx->num_probes; i++, j++) {
if (str[length - i - 1] == '1') {
ctx->sample_buffer[j / 8] |= (1 << (j % 8));
} else if (str[length - i - 1] != '0') {
sr_err("Invalid value '%s' in column %zu in line %zu.",
str, ctx->single_column, ctx->line_number);
return SR_ERR;
}
}
return SR_OK;
}
static int parse_hexstr(const char *str, struct context *ctx)
{
gsize i, j, k, length;
uint8_t value;
char c;
length = strlen(str);
if (!length) {
sr_err("Column %zu in line %zu is empty.", ctx->single_column,
ctx->line_number);
return SR_ERR;
}
/* Clear buffer in order to set bits only. */
memset(ctx->sample_buffer, 0, (ctx->num_probes + 7) >> 3);
/* Calculate the position of the first hexadecimal digit. */
i = ctx->first_probe / 4;
for (j = 0; i < length && j < ctx->num_probes; i++) {
c = str[length - i - 1];
if (!g_ascii_isxdigit(c)) {
sr_err("Invalid value '%s' in column %zu in line %zu.",
str, ctx->single_column, ctx->line_number);
return SR_ERR;
}
value = g_ascii_xdigit_value(c);
k = (ctx->first_probe + j) % 4;
for (; j < ctx->num_probes && k < 4; k++) {
if (value & (1 << k))
ctx->sample_buffer[j / 8] |= (1 << (j % 8));
j++;
}
}
return SR_OK;
}
static int parse_octstr(const char *str, struct context *ctx)
{
gsize i, j, k, length;
uint8_t value;
char c;
length = strlen(str);
if (!length) {
sr_err("Column %zu in line %zu is empty.", ctx->single_column,
ctx->line_number);
return SR_ERR;
}
/* Clear buffer in order to set bits only. */
memset(ctx->sample_buffer, 0, (ctx->num_probes + 7) >> 3);
/* Calculate the position of the first octal digit. */
i = ctx->first_probe / 3;
for (j = 0; i < length && j < ctx->num_probes; i++) {
c = str[length - i - 1];
if (c < '0' || c > '7') {
sr_err("Invalid value '%s' in column %zu in line %zu.",
str, ctx->single_column, ctx->line_number);
return SR_ERR;
}
value = g_ascii_xdigit_value(c);
k = (ctx->first_probe + j) % 3;
for (; j < ctx->num_probes && k < 3; k++) {
if (value & (1 << k))
ctx->sample_buffer[j / 8] |= (1 << (j % 8));
j++;
}
}
return SR_OK;
}
static char **parse_line(const struct context *ctx, int max_columns)
{
const char *str, *remainder;
GSList *list, *l;
char **columns;
char *column;
gsize n, k;
n = 0;
k = 0;
list = NULL;
remainder = ctx->buffer->str;
str = strstr(remainder, ctx->delimiter->str);
while (str && max_columns) {
if (n >= ctx->first_column) {
column = g_strndup(remainder, str - remainder);
list = g_slist_prepend(list, g_strstrip(column));
max_columns--;
k++;
}
remainder = str + ctx->delimiter->len;
str = strstr(remainder, ctx->delimiter->str);
n++;
}
if (ctx->buffer->len && max_columns && n >= ctx->first_column) {
column = g_strdup(remainder);
list = g_slist_prepend(list, g_strstrip(column));
k++;
}
if (!(columns = g_try_new(char *, k + 1)))
return NULL;
columns[k--] = NULL;
for (l = list; l; l = l->next)
columns[k--] = l->data;
g_slist_free(list);
return columns;
}
static int parse_multi_columns(char **columns, struct context *ctx)
{
gsize i;
/* Clear buffer in order to set bits only. */
memset(ctx->sample_buffer, 0, (ctx->num_probes + 7) >> 3);
for (i = 0; i < ctx->num_probes; i++) {
if (columns[i][0] == '1') {
ctx->sample_buffer[i / 8] |= (1 << (i % 8));
} else if (!strlen(columns[i])) {
sr_err("Column %zu in line %zu is empty.",
ctx->first_probe + i, ctx->line_number);
return SR_ERR;
} else if (columns[i][0] != '0') {
sr_err("Invalid value '%s' in column %zu in line %zu.",
columns[i], ctx->first_probe + i,
ctx->line_number);
return SR_ERR;
}
}
return SR_OK;
}
static int parse_single_column(const char *column, struct context *ctx)
{
int res;
res = SR_ERR;
switch(ctx->format) {
case FORMAT_BIN:
res = parse_binstr(column, ctx);
break;
case FORMAT_HEX:
res = parse_hexstr(column, ctx);
break;
case FORMAT_OCT:
res = parse_octstr(column, ctx);
break;
}
return res;
}
static int send_samples(const struct sr_dev_inst *sdi, uint8_t *buffer,
gsize buffer_size, gsize count)
{
int res;
struct sr_datafeed_packet packet;
struct sr_datafeed_logic logic;
gsize i;
packet.type = SR_DF_LOGIC;
packet.payload = &logic;
logic.unitsize = buffer_size;
logic.length = buffer_size;
logic.data = buffer;
for (i = 0; i < count; i++) {
if ((res = sr_session_send(sdi, &packet)) != SR_OK)
return res;
}
return SR_OK;
}
static int init(struct sr_input *in, const char *filename)
{
int res;
struct context *ctx;
const char *param;
GIOStatus status;
gsize i, term_pos;
char probe_name[SR_MAX_PROBENAME_LEN + 1];
struct sr_probe *probe;
char **columns;
gsize num_columns;
char *ptr;
if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
sr_err("Context malloc failed.");
return SR_ERR_MALLOC;
}
/* Create a virtual device. */
in->sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, NULL, NULL, NULL);
in->internal = ctx;
/* Set default samplerate. */
ctx->samplerate = 0;
/*
* Enable auto-detection of the number of probes in multi column mode
* and enforce the specification of the number of probes in single
* column mode.
*/
ctx->num_probes = 0;
/* Set default delimiter. */
if (!(ctx->delimiter = g_string_new(","))) {
sr_err("Delimiter malloc failed.");
free_context(ctx);
return SR_ERR_MALLOC;
}
/*
* Set default comment prefix. Note that an empty comment prefix
* disables removing of comments.
*/
if (!(ctx->comment = g_string_new(""))) {
sr_err("Comment malloc failed.");
free_context(ctx);
return SR_ERR_MALLOC;
}
/* Enable multi column mode by default. */
ctx->multi_column_mode = TRUE;
/* Use first column as default single column number. */
ctx->single_column = 0;
/*
* In multi column mode start parsing sample data at the first column
* and in single column mode at the first bit.
*/
ctx->first_probe = 0;
/* Start at the beginning of the file. */
ctx->start_line = 1;
/* Disable the usage of the first line as header by default. */
ctx->header = FALSE;
/* Set default format for single column mode. */
ctx->format = FORMAT_BIN;
if (!(ctx->buffer = g_string_new(""))) {
sr_err("Line buffer malloc failed.");
free_context(ctx);
return SR_ERR_MALLOC;
}
if (in->param) {
if ((param = g_hash_table_lookup(in->param, "samplerate"))) {
res = sr_parse_sizestring(param, &ctx->samplerate);
if (res != SR_OK) {
sr_err("Invalid samplerate: %s.", param);
free_context(ctx);
return SR_ERR_ARG;
}
}
if ((param = g_hash_table_lookup(in->param, "numprobes")))
ctx->num_probes = g_ascii_strtoull(param, NULL, 10);
if ((param = g_hash_table_lookup(in->param, "delimiter"))) {
if (!strlen(param)) {
sr_err("Delimiter must be at least one character.");
free_context(ctx);
return SR_ERR_ARG;
}
if (!g_ascii_strcasecmp(param, "\\t"))
g_string_assign(ctx->delimiter, "\t");
else
g_string_assign(ctx->delimiter, param);
}
if ((param = g_hash_table_lookup(in->param, "comment")))
g_string_assign(ctx->comment, param);
if ((param = g_hash_table_lookup(in->param, "single-column"))) {
ctx->single_column = g_ascii_strtoull(param, &ptr, 10);
ctx->multi_column_mode = FALSE;
if (param == ptr) {
sr_err("Invalid single-colum number: %s.",
param);
free_context(ctx);
return SR_ERR_ARG;
}
}
if ((param = g_hash_table_lookup(in->param, "first-probe")))
ctx->first_probe = g_ascii_strtoull(param, NULL, 10);
if ((param = g_hash_table_lookup(in->param, "startline"))) {
ctx->start_line = g_ascii_strtoull(param, NULL, 10);
if (ctx->start_line < 1) {
sr_err("Invalid start line: %s.", param);
free_context(ctx);
return SR_ERR_ARG;
}
}
if ((param = g_hash_table_lookup(in->param, "header")))
ctx->header = sr_parse_boolstring(param);
if ((param = g_hash_table_lookup(in->param, "format"))) {
if (!g_ascii_strncasecmp(param, "bin", 3)) {
ctx->format = FORMAT_BIN;
} else if (!g_ascii_strncasecmp(param, "hex", 3)) {
ctx->format = FORMAT_HEX;
} else if (!g_ascii_strncasecmp(param, "oct", 3)) {
ctx->format = FORMAT_OCT;
} else {
sr_err("Invalid format: %s.", param);
free_context(ctx);
return SR_ERR;
}
}
}
if (ctx->multi_column_mode)
ctx->first_column = ctx->first_probe;
else
ctx->first_column = ctx->single_column;
if (!ctx->multi_column_mode && !ctx->num_probes) {
sr_err("Number of probes needs to be specified in single column mode.");
free_context(ctx);
return SR_ERR;
}
if (!(ctx->channel = g_io_channel_new_file(filename, "r", NULL))) {
sr_err("Input file '%s' could not be opened.", filename);
free_context(ctx);
return SR_ERR;
}
while (TRUE) {
ctx->line_number++;
status = g_io_channel_read_line_string(ctx->channel,
ctx->buffer, &term_pos, NULL);
if (status == G_IO_STATUS_EOF) {
sr_err("Input file is empty.");
free_context(ctx);
return SR_ERR;
}
if (status != G_IO_STATUS_NORMAL) {
sr_err("Error while reading line %zu.",
ctx->line_number);
free_context(ctx);
return SR_ERR;
}
if (ctx->start_line > ctx->line_number) {
sr_spew("Line %zu skipped.", ctx->line_number);
continue;
}
/* Remove line termination character(s). */
g_string_truncate(ctx->buffer, term_pos);
if (!ctx->buffer->len) {
sr_spew("Blank line %zu skipped.", ctx->line_number);
continue;
}
/* Remove trailing comment. */
strip_comment(ctx->buffer, ctx->comment);
if (ctx->buffer->len)
break;
sr_spew("Comment-only line %zu skipped.", ctx->line_number);
}
/*
* In order to determine the number of columns parse the current line
* without limiting the number of columns.
*/
if (!(columns = parse_line(ctx, -1))) {
sr_err("Error while parsing line %zu.", ctx->line_number);
free_context(ctx);
return SR_ERR;
}
num_columns = g_strv_length(columns);
/* Ensure that the first column is not out of bounds. */
if (!num_columns) {
sr_err("Column %zu in line %zu is out of bounds.",
ctx->first_column, ctx->line_number);
g_strfreev(columns);
free_context(ctx);
return SR_ERR;
}
if (ctx->multi_column_mode) {
/*
* Detect the number of probes in multi column mode
* automatically if not specified.
*/
if (!ctx->num_probes) {
ctx->num_probes = num_columns;
sr_info("Number of auto-detected probes: %zu.",
ctx->num_probes);
}
/*
* Ensure that the number of probes does not exceed the number
* of columns in multi column mode.
*/
if (num_columns < ctx->num_probes) {
sr_err("Not enough columns for desired number of probes in line %zu.",
ctx->line_number);
g_strfreev(columns);
free_context(ctx);
return SR_ERR;
}
}
for (i = 0; i < ctx->num_probes; i++) {
if (ctx->header && ctx->multi_column_mode && strlen(columns[i]))
snprintf(probe_name, sizeof(probe_name), "%s",
columns[i]);
else
snprintf(probe_name, sizeof(probe_name), "%zu", i);
probe = sr_probe_new(i, SR_PROBE_LOGIC, TRUE, probe_name);
if (!probe) {
sr_err("Probe creation failed.");
free_context(ctx);
g_strfreev(columns);
return SR_ERR;
}
in->sdi->probes = g_slist_append(in->sdi->probes, probe);
}
g_strfreev(columns);
/*
* Calculate the minimum buffer size to store the sample data of the
* probes.
*/
ctx->sample_buffer_size = (ctx->num_probes + 7) >> 3;
if (!(ctx->sample_buffer = g_try_malloc(ctx->sample_buffer_size))) {
sr_err("Sample buffer malloc failed.");
free_context(ctx);
return SR_ERR_MALLOC;
}
return SR_OK;
}
static int loadfile(struct sr_input *in, const char *filename)
{
int res;
struct context *ctx;
struct sr_datafeed_packet packet;
struct sr_datafeed_meta meta;
struct sr_config *cfg;
GIOStatus status;
gboolean read_new_line;
gsize term_pos;
char **columns;
gsize num_columns;
int max_columns;
(void)filename;
ctx = in->internal;
/* Send header packet to the session bus. */
std_session_send_df_header(in->sdi, LOG_PREFIX);
if (ctx->samplerate) {
packet.type = SR_DF_META;
packet.payload = &meta;
cfg = sr_config_new(SR_CONF_SAMPLERATE,
g_variant_new_uint64(ctx->samplerate));
meta.config = g_slist_append(NULL, cfg);
sr_session_send(in->sdi, &packet);
sr_config_free(cfg);
}
read_new_line = FALSE;
/* Limit the number of columns to parse. */
if (ctx->multi_column_mode)
max_columns = ctx->num_probes;
else
max_columns = 1;
while (TRUE) {
/*
* Skip reading a new line for the first time if the last read
* line was not a header because the sample data is not parsed
* yet.
*/
if (read_new_line || ctx->header) {
ctx->line_number++;
status = g_io_channel_read_line_string(ctx->channel,
ctx->buffer, &term_pos, NULL);
if (status == G_IO_STATUS_EOF)
break;
if (status != G_IO_STATUS_NORMAL) {
sr_err("Error while reading line %zu.",
ctx->line_number);
free_context(ctx);
return SR_ERR;
}
/* Remove line termination character(s). */
g_string_truncate(ctx->buffer, term_pos);
}
read_new_line = TRUE;
if (!ctx->buffer->len) {
sr_spew("Blank line %zu skipped.", ctx->line_number);
continue;
}
/* Remove trailing comment. */
strip_comment(ctx->buffer, ctx->comment);
if (!ctx->buffer->len) {
sr_spew("Comment-only line %zu skipped.",
ctx->line_number);
continue;
}
if (!(columns = parse_line(ctx, max_columns))) {
sr_err("Error while parsing line %zu.",
ctx->line_number);
free_context(ctx);
return SR_ERR;
}
num_columns = g_strv_length(columns);
/* Ensure that the first column is not out of bounds. */
if (!num_columns) {
sr_err("Column %zu in line %zu is out of bounds.",
ctx->first_column, ctx->line_number);
g_strfreev(columns);
free_context(ctx);
return SR_ERR;
}
/*
* Ensure that the number of probes does not exceed the number
* of columns in multi column mode.
*/
if (ctx->multi_column_mode && num_columns < ctx->num_probes) {
sr_err("Not enough columns for desired number of probes in line %zu.",
ctx->line_number);
g_strfreev(columns);
free_context(ctx);
return SR_ERR;
}
if (ctx->multi_column_mode)
res = parse_multi_columns(columns, ctx);
else
res = parse_single_column(columns[0], ctx);
if (res != SR_OK) {
g_strfreev(columns);
free_context(ctx);
return SR_ERR;
}
g_strfreev(columns);
/*
* TODO: Parse sample numbers / timestamps and use it for
* decompression.
*/
/* Send sample data to the session bus. */
res = send_samples(in->sdi, ctx->sample_buffer,
ctx->sample_buffer_size, 1);
if (res != SR_OK) {
sr_err("Sending samples failed.");
free_context(ctx);
return SR_ERR;
}
}
/* Send end packet to the session bus. */
packet.type = SR_DF_END;
sr_session_send(in->sdi, &packet);
free_context(ctx);
return SR_OK;
}
SR_PRIV struct sr_input_format input_csv = {
.id = "csv",
.description = "Comma-separated values (CSV)",
.format_match = format_match,
.init = init,
.loadfile = loadfile,
};