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52 lines
1.6 KiB
Cython
52 lines
1.6 KiB
Cython
cdef class PointerHash:
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def __cinit__(self, size_t initial_size=8):
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self.size = initial_size
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self.filled = 0
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# Size must be power of two
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assert self.size & (self.size - 1) == 0
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self.cells = <Cell*>calloc(self.size, sizeof(Cell))
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def __dealloc__(self):
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free(self.cells)
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def __getitem__(self, key_t key):
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cdef Cell* cell = self.lookup(key)
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return cell.value if cell.key != 0 else None
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def __setitem__(self, key_t key, val_t value):
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self.insert(key, value
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cdef size_t find_slot(self, key_t key):
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cdef size_t i = key % self.size
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while self.cells[i].key != 0 and self.cells[i].key != key:
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i = (i + 1) % self.size
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return i
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cdef Cell* lookup(self, key_t key):
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cdef size_t i = self.find_slot(key)
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return &self.cells[i]
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cdef void insert(self, key_t key, val_t value):
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cdef size_t i = self.find_slot(key)
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if self.cells[i].key == 0:
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self.cells[i].key = key
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self.filled += 1
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self.cells[i].value = value
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if (self.filled + 1) * 4 >= (self.size * 3):
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self.resize(self.size * 2)
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cdef void resize(self, size_t new_size):
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assert new_size & (new_size - 1)) == 0 # Must be a power of 2
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assert self.filled * 4 <= new_size * 3
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self.size = new_size
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cdef Cell* old_cells = self.cells
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cdef size_t old_size = self.size
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self.size = new_size
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self.cells = <Cell*>calloc(new_size, sizeof(Cell))
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for i in range(old_size):
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self.insert(self.cells[i].key, self.cells[i].value)
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