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-rw-r--r--src/delta16/delta16.c469
1 files changed, 469 insertions, 0 deletions
diff --git a/src/delta16/delta16.c b/src/delta16/delta16.c
new file mode 100644
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--- /dev/null
+++ b/src/delta16/delta16.c
@@ -0,0 +1,469 @@
+/* -*- mode:C; c-file-style: "bsd" -*- */
+/*
+ *
+ * Copyright (c) 2014 NORDUnet A/S
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ * 3. Neither the name of the NORDUnet nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Author: Fredrik Thulin <fredrik@thulin.net>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+
+/* XXX should runtime check if this is a little-endian system already */
+#define SWAP_UINT32(x) (((x) >> 24) | (((x) & 0x00FF0000) >> 8) | (((x) & 0x0000FF00) << 8) | ((x) << 24))
+
+#define INPUT_BLOCK_SIZE 1024
+#define SYNC_BYTE 0xf0
+#define NUM_SYNC_BYTES 16
+
+enum {
+ mode_random = 0,
+ mode_random_VN,
+ mode_deltas,
+};
+
+const char *usage =
+ "This program parses the output of MODE_DELTAS in the STM32 code.\n"
+ "\n"
+ "Usage: delta16 [options] [infile] [outfile]\n"
+ "\n"
+ "Options:\n"
+ " -V von Neumann de-biased random bytes output\n"
+ " -D counter delta output\n"
+ " -v verbose\n"
+ " -d debug\n"
+ " -f force overwriting of existing output file\n"
+ ""
+ "\n"
+ ;
+const char *optstring = "VDvfd";
+
+int
+parse_args(int argc, char **argv,
+ int *mode,
+ char **infile,
+ char **outfile,
+ int *verbose,
+ int *force,
+ int *debug,
+ int *exit_code)
+{
+ int c, V = 0, D = 0;
+
+ while((c = getopt(argc, argv, optstring)) != -1) {
+ switch (c) {
+ case 'V':
+ V = 1;
+ break;
+ case 'D':
+ D = 1;
+ break;
+ case 'v':
+ *verbose = 1;
+ break;
+ case 'f':
+ *force = 1;
+ break;
+ case 'd':
+ *debug = 1;
+ break;
+
+ default:
+ fputs(usage, stderr);
+ *exit_code = 0;
+ return 0;
+ }
+ }
+
+ *mode = mode_random;
+
+ if (V && D) {
+ fprintf(stderr, "Options -V and -D can't be combined\n");
+ return 0;
+ }
+ if (V) {
+ *mode = mode_random_VN;
+ }
+ if (D) {
+ *mode = mode_deltas;
+ }
+
+ *infile = "-";
+ *outfile = "-";
+
+ if (optind < argc) {
+ *infile = argv[optind++];
+ }
+
+ if (optind < argc) {
+ *outfile = argv[optind++];
+ }
+
+ return 1;
+}
+
+int
+find_input_sync_position(FILE *in, const int verbose)
+{
+ int pos = 0;
+ int match = 0;
+ uint8_t ch;
+
+ while (pos++ < 4096) {
+ if (! fread(&ch, 1, 1, in)) {
+ return 0;
+ }
+ if (ch == SYNC_BYTE) {
+ match++;
+ if (match == NUM_SYNC_BYTES) {
+ return pos;
+ }
+ } else {
+ match = 0;
+ }
+ }
+
+ return -1;
+}
+
+int
+fill_input_buffer(FILE *in, uint8_t *buf, size_t bufsize, int verbose, unsigned long *skipped_bytes)
+{
+ int i;
+ unsigned long pos = 0, old_pos = 0;
+
+ old_pos = ftell(in);
+
+ if ((i = fread(buf, 1, bufsize, in)) != INPUT_BLOCK_SIZE) {
+ if (verbose) {
+ fprintf(stderr, "Short read, %d bytes, at position %ld / %lx\n", i, old_pos, old_pos);
+ }
+ return 2;
+ }
+ /* Expect next sync marker to immediately follow this one */
+ if ((i = find_input_sync_position(in, verbose)) > NUM_SYNC_BYTES) {
+ /*
+ fprintf(stderr, "SYNC: buf[0] from pos %ld / %lx was 0x%2x - sync found at + %d (now at %ld / %lx)\n",
+ old_pos, old_pos, buf[0], i, ftell(in), ftell(in));
+ */
+ if (i < 0) {
+ fprintf(stderr, "Sync completely lost from position %ld / %lx\n", old_pos, old_pos);
+ return 0;
+ }
+ if (fseek(in, 0 - INPUT_BLOCK_SIZE, SEEK_CUR) < 0) {
+ fprintf(stderr, "Failed seeking backwards when looking for sync from position %ld / %lx\n", old_pos, old_pos);
+ return 0;
+ }
+ i = find_input_sync_position(in, verbose);
+ pos = ftell(in);
+ if (i < INPUT_BLOCK_SIZE - 1) {
+ fprintf(stderr, "Short block (%d bytes, < %d) at position %ld / %lx. Resynced at %ld / 0x%lx.\n",
+ i, INPUT_BLOCK_SIZE, old_pos, old_pos, pos, pos);
+ } else {
+ if (verbose) {
+ fprintf(stderr, "Sync lost, skipping %ld bytes from position %ld / 0x%lx. Resynced at %ld / 0x%lx.\n",
+ pos - old_pos,
+ old_pos, old_pos,
+ pos, pos);
+ }
+ *skipped_bytes += pos - old_pos;
+ return -1;
+ }
+ }
+
+ return 1;
+}
+
+inline void
+output_deltas(FILE *out, uint32_t raw, unsigned long *write_count, int debug)
+{
+ uint32_t first, second;
+ static uint32_t last = 0, num = 0;
+
+ first = (raw & 0xffff0000) >> 16;
+ second = (raw & 0x0000ffff);
+
+ if (last > first) {
+ /* Next batch of timer values start here */
+ last = 0;
+ num = 0;
+ }
+
+ /* Need to skip the first output of each batch - it's delta value is unknown */
+ if (num) {
+ fprintf(out, "%02d %04x %02x\n", num++, first, first - last);
+ *write_count += 1;
+ } else {
+ num++;
+ }
+ fprintf(out, "%02d %04x %02x\n", num++, second, second - first);
+ *write_count += 1;
+
+ last = second;
+}
+
+inline void
+output_random(FILE *out, uint32_t raw, unsigned long *write_count, int debug)
+{
+ uint32_t first, second;
+ static uint32_t num = 0, bits = 0, old_bits;
+
+ first = (raw & 0xffff0000) >> 16;
+ second = (raw & 0x0000ffff);
+
+ old_bits = bits;
+
+ bits <<= 1; bits += (first & 1);
+ bits <<= 1; bits += (second & 1);
+
+ num += 2;
+
+ if (debug) {
+ fprintf(stderr, "raw 0x%08x -> first 0x%04x second 0x%04x bits 0x%x |= %d |= %d -> 0x%x (%d bits)\n",
+ raw, first, second, old_bits, (first & 1), (second & 1), bits, num);
+ }
+
+ if (num == 32) {
+ if (debug) {
+ fprintf(stderr, "write %02x %02x %02x %02x\n",
+ (bits & 0xff000000) >> 24,
+ (bits & 0xff0000) >> 16,
+ (bits & 0xff00) >> 8,
+ bits & 0xff
+ );
+ }
+ fprintf(out, "%c%c%c%c",
+ (bits & 0xff000000) >> 24,
+ (bits & 0xff0000) >> 16,
+ (bits & 0xff00) >> 8,
+ bits & 0xff
+ );
+ *write_count += 4;
+ bits = 0;
+ num = 0;
+ }
+}
+
+inline void
+output_random_VN(FILE *out, uint32_t raw, unsigned long *write_count, int debug)
+{
+ uint32_t first, second;
+ static uint32_t num = 0, bits = 0, old_bits;
+
+ first = (raw & 0xffff0000) >> 16;
+ second = (raw & 0x0000ffff);
+
+ /* Discard both values unless their LSB is actually different.
+ This is the Von Neumann extractor. */
+ if ((first & 1) != (second & 1)) {
+ old_bits = bits;
+
+ bits <<= 1; bits += (first & 1);
+ num++;
+
+ if (debug) {
+ fprintf(stderr, "raw 0x%08x -> first 0x%04x second 0x%04x bits 0x%x |= %d (skip second %d)-> 0x%x (%d bits)\n",
+ raw, first, second, old_bits, (first & 1), (second & 1), bits, num);
+ }
+ } else if (debug) {
+ fprintf(stderr, "raw 0x%08x -> first 0x%04x second 0x%04x\n",
+ raw, first, second);
+ }
+
+ if (num == 32) {
+ fprintf(out, "%c%c%c%c",
+ (bits & 0xff000000) >> 24,
+ (bits & 0xff0000) >> 16,
+ (bits & 0xff00) >> 8,
+ bits & 0xff
+ );
+ *write_count += 4;
+ num = 0;
+ bits = 0;
+ }
+}
+
+int
+process_data(FILE *in, FILE *out,
+ const int verbose,
+ const int debug,
+ const int mode,
+ unsigned long *skipped_bytes
+ )
+{
+ unsigned long blocks = 0, skipped_blocks = 0, write_count = 0;
+ uint32_t i, raw = 0;
+ uint32_t *buf32, *buf32_end;
+ uint8_t buf[INPUT_BLOCK_SIZE];
+
+ if (skipped_bytes) {
+ skipped_blocks = 1;
+ }
+
+ while (1) {
+ if ((i = fill_input_buffer(in, buf, sizeof(buf), verbose, skipped_bytes)) != 1) {
+ if (i == -1) {
+ skipped_blocks += 1;
+ continue;
+ }
+ if (i == 2) {
+ /* short read - EOF */
+ unsigned long counters = (blocks * INPUT_BLOCK_SIZE / 2);
+
+ fprintf(stderr, "------ delta16 ------\n");
+ fprintf(stderr, "Skipped %ld blocks (%ld bytes total) because of loss of sync.\n",
+ skipped_blocks, *skipped_bytes);
+
+ fprintf(stderr, "Processed %ld * %d = %ld bytes (%ld MB). %ld counter values.\n",
+ blocks, INPUT_BLOCK_SIZE,
+ blocks * INPUT_BLOCK_SIZE,
+ blocks * INPUT_BLOCK_SIZE / 1024 / 1024,
+ counters
+ );
+
+ if (mode != mode_deltas) {
+ fprintf(stderr, "Output count is %ld bytes (%ld MB), %.3f counters per output value.\n",
+ write_count,
+ write_count / 1024 / 1024,
+ counters / (double) write_count);
+ }
+
+ fprintf(stderr, "------ delta16 ------\n\n");
+ return 1;
+ }
+ }
+ buf32 = (uint32_t *) buf;
+ buf32_end = &buf32[INPUT_BLOCK_SIZE / sizeof(buf32[0])];
+ while (buf32 < buf32_end) {
+ /* fprintf(stderr, "Read %d @%p\n", i, &buf32); */
+ raw = *buf32++;
+ switch (mode)
+ {
+ case mode_deltas:
+ output_deltas(out, raw, &write_count, debug);
+ break;;
+ case mode_random:
+ output_random(out, raw, &write_count, debug);
+ break;;
+ case mode_random_VN:
+ output_random_VN(out, raw, &write_count, debug);
+ break;;
+ default:
+ fprintf(stderr, "Mode %d output not implemented, aborting\n", mode);
+ return 0;
+ }
+ }
+
+ blocks++;
+ if (verbose && ! (blocks % 100000) && blocks) {
+ fprintf(stderr, "Processed %ld blocks (file position %ld / 0x%lx / %ld MB)\n",
+ blocks, ftell(in), ftell(in), ftell(in) / 1024 / 1024);
+ }
+ };
+
+ /* NOT REACHED */
+ return 0;
+}
+
+int
+main(int argc, char **argv)
+{
+ int mode, debug = 0, verbose = 0, force = 0, exit_code = 1;
+ unsigned long skipped_bytes = 0;
+ char *infile, *outfile;
+ FILE *in, *out;
+
+ if (! parse_args(argc, argv,
+ &mode,
+ &infile,
+ &outfile,
+ &verbose,
+ &force,
+ &debug,
+ &exit_code
+ ))
+ goto err;
+
+ if (! strcmp(infile, "-")) {
+ in = stdin;
+ } else {
+ if (verbose) {
+ fprintf(stderr, "Opening input file '%s' for reading\n", infile);
+ }
+ if (! (in = fopen(infile, "rb"))) {
+ fprintf(stderr, "Failed opening input file '%s' for reading: %s\n", infile, strerror(errno));
+ goto err;
+ }
+ }
+
+ if ((skipped_bytes = find_input_sync_position(in, verbose)) < 0) {
+ fprintf(stderr, "Could not find sync sequence in input\n");
+ goto err;
+ }
+ if (verbose) {
+ fprintf(stderr, "Initial sync found at position %ld / 0x%lx\n", skipped_bytes, skipped_bytes);
+ }
+
+ if (! strcmp(outfile, "-")) {
+ out = stdout;
+ } else {
+ if (! force) {
+ /* Check that file does not already exist */
+ if (access(outfile, F_OK) == F_OK) {
+ fprintf(stderr, "Refusing to overwrite existing output file without -f (force)\n");
+ goto err;
+ }
+ }
+ if (verbose) {
+ fprintf(stderr, "Opening output file '%s' for writing\n", outfile);
+ }
+ if (! (out = fopen(outfile, "wb"))) {
+ fprintf(stderr, "Failed opening output file '%s' for writing: %s\n", outfile, strerror(errno));
+ goto err;
+ }
+ }
+
+ if (! process_data(in, out, verbose, debug, mode, &skipped_bytes)) {
+ fprintf(stderr, "Failed processing data\n");
+ goto err;
+ }
+
+ exit_code = 0;
+err:
+ exit(exit_code);
+}
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