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112 lines
2.4 KiB
C
112 lines
2.4 KiB
C
/*
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* fw/image.c - Image data (upload and conversion)
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*
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* Written 2012 by Werner Almesberger
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* Copyright 2012 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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#include "io.h"
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#include "hash.h"
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#include "proto.h"
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#include "dispatch.h"
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#include "secret.h"
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#include "image.h"
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static struct line images[2][MAX_LINES];
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static const struct line *next_image;
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static struct line *p, *end;
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static bool failed;
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const struct line *image = images[0];
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#define MAP(port, value, group) ( \
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((value) & 1 ? MASK(port, LED_##group##1) : 0) | \
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((value) & 2 ? MASK(port, LED_##group##2) : 0) | \
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((value) & 4 ? MASK(port, LED_##group##3) : 0) | \
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((value) & 8 ? MASK(port, LED_##group##4) : 0) | \
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((value) & 16 ? MASK(port, LED_##group##5) : 0) | \
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((value) & 32 ? MASK(port, LED_##group##6) : 0) | \
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((value) & 64 ? MASK(port, LED_##group##7) : 0) | \
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((value) & 128 ? MASK(port, LED_##group##8) : 0))
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struct line localize_line(uint8_t p0, uint8_t p1)
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{
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struct line res;
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res.cb = MAP(B, p0, A) | MAP(B, p1, B) |
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MAP(C, p0, A) | MAP(C, p1, B);
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res.d = MAP(D, p0, A) | MAP(D, p1, B);
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return res;
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}
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static void add_payload(const uint8_t *payload)
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{
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uint8_t i;
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for (i = 0; i != PAYLOAD && p != end; i += 2)
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*p++ = localize_line(payload[i], payload[i+1]);
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}
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static bool image_more(uint8_t seq, uint8_t limit, const uint8_t *payload)
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{
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switch (limit-seq) {
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default:
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add_payload(payload);
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/* fall through */
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case 3:
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case 2:
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hash_merge(payload, PAYLOAD);
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break;
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case 1:
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hash_end();
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failed = !hash_eq(payload, PAYLOAD, 0);
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break;
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case 0:
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if (!hash_eq(payload, PAYLOAD, PAYLOAD))
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failed = 1;
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if (failed)
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return 0;
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image = next_image;
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break;
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}
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return 1;
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}
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static bool image_first(uint8_t limit, const uint8_t *payload)
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{
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hash_init();
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hash_merge_progmem(image_secret, sizeof(image_secret));
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if (image == images[0])
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p = images[1];
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else
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p = images[0];
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next_image = p;
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end = p+MAX_LINES;
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memset(p, 0, (char *) end-(char *) p);
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failed = 0;
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return image_more(0, limit, payload);;
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}
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struct handler image_handler = {
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.type = IMAGE,
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.first = image_first,
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.more = image_more,
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};
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