1// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file. See the AUTHORS file for names of contributors.
4
5#include "util/testutil.h"
6
7#include <string>
8
9#include "util/random.h"
10
11namespace leveldb {
12namespace test {
13
14Slice RandomString(Random* rnd, int len, std::string* dst) {
15 dst->resize(len);
16 for (int i = 0; i < len; i++) {
17 (*dst)[i] = static_cast<char>(' ' + rnd->Uniform(95)); // ' ' .. '~'
18 }
19 return Slice(*dst);
20}
21
22std::string RandomKey(Random* rnd, int len) {
23 // Make sure to generate a wide variety of characters so we
24 // test the boundary conditions for short-key optimizations.
25 static const char kTestChars[] = {'\0', '\1', 'a', 'b', 'c',
26 'd', 'e', '\xfd', '\xfe', '\xff'};
27 std::string result;
28 for (int i = 0; i < len; i++) {
29 result += kTestChars[rnd->Uniform(sizeof(kTestChars))];
30 }
31 return result;
32}
33
34Slice CompressibleString(Random* rnd, double compressed_fraction, size_t len,
35 std::string* dst) {
36 int raw = static_cast<int>(len * compressed_fraction);
37 if (raw < 1) raw = 1;
38 std::string raw_data;
39 RandomString(rnd, raw, &raw_data);
40
41 // Duplicate the random data until we have filled "len" bytes
42 dst->clear();
43 while (dst->size() < len) {
44 dst->append(raw_data);
45 }
46 dst->resize(len);
47 return Slice(*dst);
48}
49
50} // namespace test
51} // namespace leveldb
52