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Correction to Base256 encoding

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This commit is contained in:
hooper114 2009-01-22 22:25:12 +00:00
parent 8bdb2e28a4
commit e527c45c2d
1 changed files with 12 additions and 6 deletions
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18
backend/dm200.c
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@ -382,20 +382,26 @@ char ecc200encode(unsigned char *t, int tl, unsigned char *s, int sl, char *enco
case 'b': // Binary
{
int l = 0; // how much to encode
int temp;
if (encoding) {
int p;
for (p = sp; p < sl && tolower(encoding[p]) == 'b'; p++)
l++;
}
t[tp++] = 231; // base256
if (l < 250)
t[tp++] = l;
else {
t[tp++] = 249 + (l / 250);
t[tp++] = (l % 250);
if (l < 250) {
t[tp] = l + (((tp + 1) * 149) % 255) + 1; tp++;
} else {
t[tp] = (249 + (l / 250)) + (((tp + 1) * 149) % 255) + 1; tp++;
t[tp] = (l % 250) + (((tp + 1) * 149) % 255) + 1; tp++;
}
while (l-- && tp < tl) {
t[tp] = s[sp++] + (((tp + 1) * 149) % 255) + 1; // see annex H
temp = s[sp++] + (((tp + 1) * 149) % 255) + 1; // see annex H
if(temp <= 255) {
t[tp] = temp;
} else {
t[tp] = temp - 256;
}
tp++;
}
enc = 'a'; // reverse to ASCII at end