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Avoid division by zero.

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Before this patch, small images (i.e. 7x7 pixels or less) could trigger
SIGFPE because of a (integer) division by zero.
This commit is contained in:
Alexandre Perrin 2016-10-03 15:45:37 +02:00
parent 87e79e769b
commit 66da9e99ce
1 changed files with 7 additions and 5 deletions
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12
lib/identify.c
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@ -201,17 +201,19 @@ static void threshold(struct quirc *q)
u = x; u = x;
} }
avg_w = (avg_w * (threshold_s - 1)) / if (threshold_s > 0) {
threshold_s + row[w]; avg_w = (avg_w * (threshold_s - 1)) /
avg_u = (avg_u * (threshold_s - 1)) / threshold_s + row[w];
threshold_s + row[u]; avg_u = (avg_u * (threshold_s - 1)) /
threshold_s + row[u];
}
row_average[w] += avg_w; row_average[w] += avg_w;
row_average[u] += avg_u; row_average[u] += avg_u;
} }
for (x = 0; x < q->w; x++) { for (x = 0; x < q->w; x++) {
if (row[x] < row_average[x] * if (threshold_s > 0 && row[x] < row_average[x] *
(100 - THRESHOLD_T) / (200 * threshold_s)) (100 - THRESHOLD_T) / (200 * threshold_s))
row[x] = QUIRC_PIXEL_BLACK; row[x] = QUIRC_PIXEL_BLACK;
else else