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