/*
- * This file is part of the sigrok project.
+ * This file is part of the libsigrok project.
*
* Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
*
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
-#include "sigrok.h"
-#include "sigrok-internal.h"
+#include <glib.h>
+#include "libsigrok.h"
+#include "libsigrok-internal.h"
+
+#define LOG_PREFIX "filter"
+
+/**
+ * @file
+ *
+ * Helper functions to filter out unused probes from samples.
+ */
+
+/**
+ * @defgroup grp_filter Probe filter
+ *
+ * Helper functions to filter out unused probes from samples.
+ *
+ * @{
+ */
/**
* Remove unused probes from samples.
* The requested unit size must be big enough to hold as
* much data as is specified by the number of enabled
* probes in 'probelist'.
- * @param probelist Pointer to a list of integers (probe numbers). The probe
- * numbers in this list are 1-based, i.e. the first probe
- * is expected to be numbered 1 (not 0!). Must not be NULL.
+ * @param probe_array Pointer to a list of probe numbers, numbered starting
+ * from 0. The list is terminated with -1.
* @param data_in Pointer to the input data buffer. Must not be NULL.
* @param length_in The input data length (>= 1), in number of bytes.
* @param data_out Variable which will point to the newly allocated buffer
* or SR_ERR_ARG upon invalid arguments.
* If something other than SR_OK is returned, the values of
* out_unitsize, data_out, and length_out are undefined.
+ *
+ * @since 0.2.0
*/
-SR_API int sr_filter_probes(int in_unitsize, int out_unitsize,
- const int *probelist, const unsigned char *data_in,
- uint64_t length_in, char **data_out,
+SR_API int sr_filter_probes(unsigned int in_unitsize, unsigned int out_unitsize,
+ const GArray *probe_array, const uint8_t *data_in,
+ uint64_t length_in, uint8_t **data_out,
uint64_t *length_out)
{
unsigned int in_offset, out_offset;
- int num_enabled_probes, out_bit, i;
- uint64_t sample_in, sample_out;
+ int *probelist, out_bit;
+ unsigned int i;
+ uint8_t *sample_in, *sample_out;
- if (!probelist) {
- sr_err("filter: %s: probelist was NULL", __func__);
+ if (!probe_array) {
+ sr_err("%s: probe_array was NULL", __func__);
return SR_ERR_ARG;
}
+ probelist = (int *)probe_array->data;
if (!data_in) {
- sr_err("filter: %s: data_in was NULL", __func__);
+ sr_err("%s: data_in was NULL", __func__);
return SR_ERR_ARG;
}
if (!data_out) {
- sr_err("filter: %s: data_out was NULL", __func__);
+ sr_err("%s: data_out was NULL", __func__);
return SR_ERR_ARG;
}
if (!length_out) {
- sr_err("filter: %s: length_out was NULL", __func__);
+ sr_err("%s: length_out was NULL", __func__);
return SR_ERR_ARG;
}
- num_enabled_probes = 0;
- for (i = 0; probelist[i]; i++)
- num_enabled_probes++;
-
/* Are there more probes than the target unit size supports? */
- if (num_enabled_probes > out_unitsize * 8) {
- sr_err("filter: %s: too many probes (%d) for the target unit "
- "size (%d)", num_enabled_probes, out_unitsize, __func__);
+ if (probe_array->len > out_unitsize * 8) {
+ sr_err("%s: too many probes (%d) for the target unit "
+ "size (%d)", __func__, probe_array->len, out_unitsize);
return SR_ERR_ARG;
}
if (!(*data_out = g_try_malloc(length_in))) {
- sr_err("filter: %s: data_out malloc failed", __func__);
+ sr_err("%s: data_out malloc failed", __func__);
return SR_ERR_MALLOC;
}
- if (num_enabled_probes == in_unitsize * 8) {
+ if (probe_array->len == in_unitsize * 8) {
/* All probes are used -- no need to compress anything. */
memcpy(*data_out, data_in, length_in);
*length_out = length_in;
/* If we reached this point, not all probes are used, so "compress". */
in_offset = out_offset = 0;
while (in_offset <= length_in - in_unitsize) {
- memcpy(&sample_in, data_in + in_offset, in_unitsize);
- sample_out = out_bit = 0;
- for (i = 0; probelist[i]; i++) {
- if (sample_in & (1 << (probelist[i] - 1)))
- sample_out |= (1 << out_bit);
+ sample_in = (uint8_t *)data_in + in_offset;
+ sample_out = (*data_out) + out_offset;
+ memset(sample_out, 0, out_unitsize);
+ out_bit = 0;
+ for (i = 0; i < probe_array->len; i++) {
+ if (sample_in[probelist[i]>>3] & (1 << (probelist[i]&7)))
+ sample_out[out_bit>>3] |= (1 << (out_bit&7));
out_bit++;
}
- memcpy((*data_out) + out_offset, &sample_out, out_unitsize);
in_offset += in_unitsize;
out_offset += out_unitsize;
}
return SR_OK;
}
+
+/** @} */