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fastutils.pyx
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73 lines (57 loc) · 1.95 KB
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#
# Copyright (c) 2011-2014 Exxeleron GmbH
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import numpy
cimport numpy
DTYPE = numpy.int
ctypedef numpy.int_t DTYPE_t
DTYPE8 = numpy.int
ctypedef numpy.uint8_t DTYPE8_t
def uncompress(numpy.ndarray[DTYPE8_t] data, DTYPE_t uncompressed_size):
cdef DTYPE_t n, r, i, d, s, p, pp, f
n, r, s, p, pp = 0, 0, 0, 0, 0
i, d = 1, 1
cdef numpy.ndarray[DTYPE_t] ptrs = numpy.zeros(256, dtype = DTYPE)
cdef numpy.ndarray[DTYPE8_t] uncompressed = numpy.zeros(uncompressed_size, dtype = numpy.uint8)
cdef numpy.ndarray[DTYPE_t] idx = numpy.arange(uncompressed_size, dtype = DTYPE)
f = 0xff & data[0]
while s < uncompressed_size:
pp = p + 1
if f & i:
r = ptrs[data[d]]
n = 2 + data[d + 1]
uncompressed[idx[s:s + n]] = uncompressed[r:r + n]
ptrs[uncompressed[p] ^ uncompressed[pp]] = p
if s == pp:
ptrs[uncompressed[pp] ^ uncompressed[pp + 1]] = pp
d += 2
r += 2
s = s + n
p = s
else:
uncompressed[s] = data[d]
if pp == s:
ptrs[uncompressed[p] ^ uncompressed[pp]] = p
p = pp
s += 1
d += 1
if i == 128:
if s < uncompressed_size:
f = 0xff & data[d]
d += 1
i = 1
else:
i += i
return uncompressed