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Fix numeric overflow

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This commit is contained in:
Eric Fischer
2016-04-28 11:52:09 -07:00
parent 666565e820
commit 5490f3e15f
2 changed files with 16 additions and 7 deletions
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tile.cpp
+12 -3
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@@ -501,14 +501,14 @@ int manage_gap(unsigned long long index, unsigned long long *previndex, double s
return 1; // Exact duplicate: can't fulfil the gap requirement
}
if (std::exp(std::log((index - *previndex) / scale) * gamma) >= *gap) {
if (index < *previndex || std::exp(std::log((index - *previndex) / scale) * gamma) >= *gap) {
// Dot is further from the previous than the nth root of the gap,
// so produce it, and choose a new gap at the next point.
*gap = 0;
} else {
return 1;
}
} else {
} else if (index >= *previndex) {
*gap = (index - *previndex) / scale;
if (*gap == 0) {
@@ -1182,8 +1182,17 @@ int traverse_zooms(int *geomfd, off_t *geom_size, char *metabase, char *stringpo
if (threads > useful_threads) {
threads = useful_threads;
}
// Round down to a power of 2
threads = 1 << (int) (std::log(threads) / std::log(2));
for (int e = 0; e < 30; e++) {
if (threads >= (1 << e) && threads < (1 << (e + 1))) {
threads = 1 << e;
break;
}
}
if (threads >= (1 << 30)) {
threads = 1 << 30;
}
// Assign temporary files to threads