25'ten fazla konu seçemezsiniz
Konular bir harf veya rakamla başlamalı, kısa çizgiler ('-') içerebilir ve en fazla 35 karakter uzunluğunda olabilir.
51 satır
1.4 KiB
51 satır
1.4 KiB
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file. See the AUTHORS file for names of contributors.
|
|
|
|
#include "util/testutil.h"
|
|
|
|
#include "util/random.h"
|
|
|
|
namespace leveldb {
|
|
namespace test {
|
|
|
|
Slice RandomString(Random* rnd, int len, std::string* dst) {
|
|
dst->resize(len);
|
|
for (int i = 0; i < len; i++) {
|
|
(*dst)[i] = static_cast<char>(' ' + rnd->Uniform(95)); // ' ' .. '~'
|
|
}
|
|
return Slice(*dst);
|
|
}
|
|
|
|
std::string RandomKey(Random* rnd, int len) {
|
|
// Make sure to generate a wide variety of characters so we
|
|
// test the boundary conditions for short-key optimizations.
|
|
static const char kTestChars[] = {
|
|
'\0', '\1', 'a', 'b', 'c', 'd', 'e', '\xfd', '\xfe', '\xff'
|
|
};
|
|
std::string result;
|
|
for (int i = 0; i < len; i++) {
|
|
result += kTestChars[rnd->Uniform(sizeof(kTestChars))];
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
extern Slice CompressibleString(Random* rnd, double compressed_fraction,
|
|
int len, std::string* dst) {
|
|
int raw = static_cast<int>(len * compressed_fraction);
|
|
if (raw < 1) raw = 1;
|
|
std::string raw_data;
|
|
RandomString(rnd, raw, &raw_data);
|
|
|
|
// Duplicate the random data until we have filled "len" bytes
|
|
dst->clear();
|
|
while (dst->size() < len) {
|
|
dst->append(raw_data);
|
|
}
|
|
dst->resize(len);
|
|
return Slice(*dst);
|
|
}
|
|
|
|
} // namespace test
|
|
} // namespace leveldb
|