From 471f8e3dd04990402b2297a99d9e7448f8e6d311 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Sun, 27 Jan 2013 23:00:46 +0000
Subject: clean up @ update keys

git-svn-id: https://svn.spreadspace.org/avr/trunk@79 aa12f405-d877-488e-9caf-2d797e2a1cc7
---
 usb-i2c-sl018/update-keys.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/usb-i2c-sl018/update-keys.c b/usb-i2c-sl018/update-keys.c
index 9343c3c..116a285 100644
--- a/usb-i2c-sl018/update-keys.c
+++ b/usb-i2c-sl018/update-keys.c
@@ -24,14 +24,14 @@
 #include <ctype.h>
 #include <stdio.h>
 
-#define KEY_LEN_MAX 7
-#define MAX_KEYS 128
+#define EEPROM_SIZE 1024
+typedef uint8_t keyslot_t[8];
 
 /* this generates a Fletcher8 checksum  */
 /* code from: http://stackoverflow.com/questions/13491700/8-bit-fletcher-checksum-of-16-byte-data */
-char generate_csum(char* data)
+uint8_t generate_csum(keyslot_t data)
 {
-  uint16_t sum1 = 0xf, sum2 = 0xf, len = KEY_LEN_MAX;
+  uint16_t sum1 = 0xf, sum2 = 0xf, len = sizeof(keyslot_t)-1;
   do { sum2 += ( sum1 += *data++ ); } while (--len);
   return sum2<<4 | sum1;
 }
@@ -55,7 +55,7 @@ int main(int argc, char* argv[])
   char* line = NULL;
   size_t len = 0;
   int line_num = 0;
-  uint8_t key[KEY_LEN_MAX+1];
+  keyslot_t key;
   int key_num = 0;
 
   for(;;) {
@@ -70,7 +70,7 @@ int main(int argc, char* argv[])
         break;
       }
     }
-    if(i & 1 || i == 0 || i > KEY_LEN_MAX*2) {
+    if(i & 1 || i == 0 || i > (sizeof(keyslot_t)-1)*2) {
       fprintf(stderr, "ignoring invalid key (odd number of digits or empty string or too long) at line %d\n", line_num);
       continue;
     }
@@ -82,14 +82,14 @@ int main(int argc, char* argv[])
       tmp[1] = line[j*2 + 1];
       key[j] = (char)strtoul(tmp, NULL, 16);
     }
-    for(j=i/2; j < KEY_LEN_MAX; ++j) {
+    for(j=i/2; j < sizeof(keyslot_t)-1; ++j) {
       key[j] = 0;
     }
-    key[KEY_LEN_MAX] = generate_csum(key);
-    fwrite(key, KEY_LEN_MAX+1, 1, dev);
+    key[sizeof(keyslot_t)-1] = generate_csum(key);
+    fwrite(key, sizeof(keyslot_t), 1, dev);
     key_num++;
-    if(key_num > MAX_KEYS) {
-      fprintf(stderr, "reached maximum number of key slots (%d), will ignore remaining keys\n", MAX_KEYS);
+    if(key_num > EEPROM_SIZE/sizeof(keyslot_t)) {
+      fprintf(stderr, "reached maximum number of key slots (%d), will ignore remaining keys\n", EEPROM_SIZE/sizeof(keyslot_t));
       break;
     }
   }
@@ -97,9 +97,9 @@ int main(int argc, char* argv[])
   printf("read %d keys from STDIN\n", key_num);
   
   int i;
-  for(i=0; i<=KEY_LEN_MAX; ++i) key[i] = 0xFF;
-  for(i=key_num; i < MAX_KEYS; ++i)
-    fwrite(key, KEY_LEN_MAX+1, 1, dev);
+  for(i=0; i<=sizeof(keyslot_t)-1; ++i) key[i] = 0xFF;
+  for(i=key_num; i < EEPROM_SIZE/sizeof(keyslot_t); ++i)
+    fwrite(key, sizeof(keyslot_t), 1, dev);
 
   char tmp;
   while(fread(&tmp, 1, 1, dev)) {
-- 
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