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tools/atrf-txrx/perdump: new utility to analyze a PER dump

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- Makefile: added perdump
- perdump.h, perdump.c: read and analyze a PER dump in pcap format
- per-text.c: report PER test results as text on the console
This commit is contained in:
Werner Almesberger
2011-01-19 17:52:10 -03:00
parent 1fb05c221d
commit 6002759464
4 changed files with 283 additions and 2 deletions
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153
tools/atrf-txrx/perdump.c Normal file
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/*
* atrf-txrx/perdump.c - Analyze and dump a recorded PER test
*
* Written 2011 by Werner Almesberger
* Copyright 2011 Werner Almesberger
*
* 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 2 of the License, or
* (at your option) any later version.
*/
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include "pcap.h"
#include "perdump.h"
#define MAX_PSDU 127
static const struct result_ops *ops;
static void analyze(uint8_t *buf, int len)
{
static int last = -1;
int freq[256];
uint8_t best = 0;
int i;
for (i = 0; i != 256; i++)
freq[i] = 0;
for (i = 0; i != len; i++) {
freq[buf[i]]++;
if (!i || freq[buf[i]] > freq[best])
best = buf[i];
}
if (freq[best] <= len >> 1 && freq[best] != len) {
ops->undecided(len*2);
if (last != -1)
last++; /* probably :-) */
return;
}
ops->packet(len*2, last == -1 ? 0 : (uint8_t) (best-last-1));
last = best;
for (i = 0; i != len; i++) {
uint8_t delta = buf[i] ^ best;
if (delta & 0x0f)
ops->error(i*2);
if (delta & 0xf0)
ops->error(i*2+1);
}
}
static int pcap_record(FILE *file, const char *name)
{
struct pcap_pkthdr hdr;
uint8_t buf[MAX_PSDU];
size_t got;
got = fread(&hdr, sizeof(hdr), 1, file);
if (!got) {
if (ferror(file)) {
perror(name);
exit(1);
}
return 0;
}
if (hdr.caplen > MAX_PSDU) {
fprintf(stderr, "packet too big %u > %u\n",
hdr.caplen, MAX_PSDU);
exit(1);
}
got = fread(buf, hdr.caplen, 1, file);
if (!got) {
if (ferror(file)) {
perror(name);
exit(1);
}
fprintf(stderr, "file truncated\n");
exit(1);
}
analyze(buf, hdr.caplen);
return 1;
}
static void process_pcap(const char *name)
{
FILE *file;
struct pcap_file_header hdr;
size_t got;
file = fopen(name, "r");
if (!file) {
perror(name);
exit(1);
}
got = fread(&hdr, sizeof(hdr), 1, file);
if (!got) {
if (ferror(file)) {
perror(name);
exit(1);
}
return;
return;
}
if (hdr.magic != PCAP_FILE_MAGIC) {
fprintf(stderr, "unrecognized magic number 0x%08x "
"(expected 0x%08x)\n", hdr.magic, PCAP_FILE_MAGIC);
exit(1);
}
if (hdr.version_major != 2) {
fprintf(stderr, "unrecognized major number %u (expected %u)\n",
hdr.version_major, 2);
exit(1);
}
if (hdr.linktype != DLT_IEEE802_15_4) {
fprintf(stderr, "unrecognized link type 0x%x "
"(expected 0x%0x)\n", hdr.linktype, DLT_IEEE802_15_4);
exit(1);
}
if (ops->begin)
ops->begin();
while (pcap_record(file, name));
if (ops->finish)
ops->finish();
fclose(file);
}
static void usage(const char *name)
{
fprintf(stderr, "usage: %s pcap-file\n", name);
exit(1);
}
int main(int argc, char **argv)
{
if (argc != 2)
usage(*argv);
ops = &text_ops;
process_pcap(argv[1]);
return 0;
}