3 bup_python="$(dirname "$0")/../cmd/bup-python" || exit $?
4 exec "$bup_python" "$0" ${1+"$@"}
7 from random import randint
8 from sys import stderr, stdout
12 def smaller_region(max_offset):
13 start = randint(0, max_offset)
14 return (start, min(max_offset, randint(start + 1, start + 5)))
17 def possibly_larger_region(max_offset, min_sparse_len):
18 start = randint(0, max_offset)
19 return (start, min(max_offset, randint(start + 1,
20 start + 3 * min_sparse_len)))
23 def initial_region(max_offset, min_sparse_len):
25 return (start, min(max_offset, randint(start + 1,
26 start + 3 * min_sparse_len)))
29 def final_region(max_offset, min_sparse_len):
30 start = max(0, randint(max_offset - 3 * min_sparse_len,
32 return (start, max_offset)
35 def region_around_min_len(max_offset, min_sparse_len):
36 start = randint(0, max_offset)
37 return (start, min(max_offset, randint(start + min_sparse_len - 5,
38 start + min_sparse_len + 5)))
45 return generators[randint(0, len(generators) - 1)]()
50 if len(sys.argv) == 2:
51 out = open(sys.argv[1], 'wb')
53 print >> stderr, "Usage: sparse-test-data [FILE]"
55 bup_read_size = 2 ** 16
56 bup_min_sparse_len = 512
57 out_size = randint(0, bup_read_size * 10)
59 generators = (lambda : smaller_region(out_size),
60 lambda : possibly_larger_region(out_size, bup_min_sparse_len),
61 lambda : initial_region(out_size, bup_min_sparse_len),
62 lambda : final_region(out_size, bup_min_sparse_len),
63 lambda : region_around_min_len(out_size, bup_min_sparse_len))
66 sparse.append(random_region())
67 sparse.append(random_region())
70 if sparse[1][0] < sparse[0][0]:
71 sparse[0], sparse[1] = sparse[1], sparse[0]
74 sparse_offsets.append(sparse[0][0])
75 if sparse[1][0] <= sparse[0][1]:
76 sparse_offsets.append(max(sparse[0][1], sparse[1][1]))
78 sparse_offsets.extend((sparse[0][1], sparse[1][0], sparse[1][1]))
80 if sparse[1][1] != out_size:
81 sparse_offsets.append(out_size)
83 # Now sparse_offsets indicates where to start/stop zero runs
86 print >> stderr, 'offsets:', sparse_offsets
87 for offset in sparse_offsets:
89 print >> stderr, 'write:', 'x' if data == 'x' else '0', count
90 out.write(data * (offset - pos))
92 data = '\0' if data == 'x' else 'x'