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update pmtiles.hpp from upstream (#98)

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* remove unused code [#93]

* fix OOB caused by specific entry set lengths

* add more checks for valid tile IDs
This commit is contained in:
Brandon Liu
2023-05-04 10:45:22 -07:00
committed by GitHub
parent afc7ca01a2
commit e43d6dacdd
1 changed files with 15 additions and 22 deletions
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pmtiles/pmtiles.hpp
+15 -22
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@@ -183,18 +183,6 @@ struct entry_zxy {
}
};
struct {
bool operator()(entry_zxy a, entry_zxy b) const {
if (a.z != b.z) {
return a.z < b.z;
}
if (a.x != b.x) {
return a.x < b.x;
}
return a.y < b.y;
}
} entry_zxy_cmp;
struct varint_too_long_exception : std::exception {
const char *what() const noexcept override {
return "varint too long exception";
@@ -311,14 +299,14 @@ void rotate(int64_t n, int64_t &x, int64_t &y, int64_t rx, int64_t ry) {
}
zxy t_on_level(uint8_t z, uint64_t pos) {
int64_t n = 1 << z;
int64_t n = 1LL << z;
int64_t rx, ry, s, t = pos;
int64_t tx = 0;
int64_t ty = 0;
for (s = 1; s < n; s *= 2) {
rx = 1 & (t / 2);
ry = 1 & (t ^ rx);
rx = 1LL & (t / 2);
ry = 1LL & (t ^ rx);
rotate(s, tx, ty, rx, ry);
tx += s * rx;
ty += s * ry;
@@ -385,28 +373,33 @@ entryv3 find_tile(const std::vector<entryv3> &entries, uint64_t tile_id) {
inline zxy tileid_to_zxy(uint64_t tileid) {
uint64_t acc = 0;
uint8_t t_z = 0;
while (true) {
for (uint8_t t_z = 0; t_z < 32; t_z++) {
uint64_t num_tiles = (1LL << t_z) * (1LL << t_z);
if (acc + num_tiles > tileid) {
return t_on_level(t_z, tileid - acc);
}
acc += num_tiles;
t_z++;
}
throw std::overflow_error("tile zoom exceeds 64-bit limit");
}
inline uint64_t zxy_to_tileid(uint8_t z, uint32_t x, uint32_t y) {
if (z > 31) {
throw std::overflow_error("tile zoom exceeds 64-bit limit");
}
if (x > (1 << z) - 1 || y > (1 << z) - 1) {
throw std::overflow_error("tile x/y outside zoom level bounds");
}
uint64_t acc = 0;
for (uint8_t t_z = 0; t_z < z; t_z++) acc += (1LL << t_z) * (1LL << t_z);
int64_t n = 1 << z;
int64_t n = 1LL << z;
int64_t rx, ry, s, d = 0;
int64_t tx = x;
int64_t ty = y;
for (s = n / 2; s > 0; s /= 2) {
rx = (tx & s) > 0;
ry = (ty & s) > 0;
d += s * s * ((3 * rx) ^ ry);
d += s * s * ((3LL * rx) ^ ry);
rotate(s, tx, ty, rx, ry);
}
return acc + d;
@@ -491,7 +484,7 @@ inline std::tuple<std::string, std::string, int> build_root_leaves(const std::fu
std::vector<pmtiles::entryv3> root_entries;
std::string leaves_bytes;
int num_leaves = 0;
for (size_t i = 0; i <= entries.size(); i += leaf_size) {
for (size_t i = 0; i < entries.size(); i += leaf_size) {
num_leaves++;
int end = i + leaf_size;
if (i + leaf_size > entries.size()) {
@@ -585,4 +578,4 @@ inline std::pair<uint64_t, uint32_t> get_tile(const std::function<std::string(co
}
} // namespace pmtiles
#endif
#endif