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python: raise errors in overflow and invalid tile ID cases

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This commit is contained in:
Brandon Liu
2022-12-22 21:56:23 +08:00
parent b23c98dd39
commit 78cde0d51f
2 changed files with 27 additions and 3 deletions
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9
python/pmtiles/tile.py
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@@ -41,6 +41,10 @@ def t_on_level(z, pos):
def zxy_to_tileid(z, x, y):
if z > 31:
raise OverflowError("tile zoom exceeds 64-bit limit")
if x > (1 << z) - 1 or y > (1 << z) - 1:
raise ValueError("tile x/y outside zoom level bounds")
acc = 0
tz = 0
while tz < z:
@@ -70,13 +74,12 @@ def zxy_to_tileid(z, x, y):
def tileid_to_zxy(tile_id):
num_tiles = 0
acc = 0
z = 0
while True:
for z in range(0,32):
num_tiles = (1 << z) * (1 << z)
if acc + num_tiles > tile_id:
return t_on_level(z, tile_id - acc)
acc += num_tiles
z += 1
raise OverflowError("tile zoom exceeds 64-bit limit")
def find_tile(entries, tile_id):