| 1 | /* |
| 2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This source code is licensed under both the BSD-style license (found in the |
| 6 | * LICENSE file in the root directory of this source tree) and the GPLv2 (found |
| 7 | * in the COPYING file in the root directory of this source tree). |
| 8 | */ |
| 9 | #include "utils/Buffer.h" |
| 10 | #include "utils/Range.h" |
| 11 | |
| 12 | #include <gtest/gtest.h> |
| 13 | #include <memory> |
| 14 | |
| 15 | using namespace pzstd; |
| 16 | |
| 17 | namespace { |
| 18 | void deleter(const unsigned char* buf) { |
| 19 | delete[] buf; |
| 20 | } |
| 21 | } |
| 22 | |
| 23 | TEST(Buffer, Constructors) { |
| 24 | Buffer empty; |
| 25 | EXPECT_TRUE(empty.empty()); |
| 26 | EXPECT_EQ(0, empty.size()); |
| 27 | |
| 28 | Buffer sized(5); |
| 29 | EXPECT_FALSE(sized.empty()); |
| 30 | EXPECT_EQ(5, sized.size()); |
| 31 | |
| 32 | Buffer moved(std::move(sized)); |
| 33 | EXPECT_FALSE(sized.empty()); |
| 34 | EXPECT_EQ(5, sized.size()); |
| 35 | |
| 36 | Buffer assigned; |
| 37 | assigned = std::move(moved); |
| 38 | EXPECT_FALSE(sized.empty()); |
| 39 | EXPECT_EQ(5, sized.size()); |
| 40 | } |
| 41 | |
| 42 | TEST(Buffer, BufferManagement) { |
| 43 | std::shared_ptr<unsigned char> buf(new unsigned char[10], deleter); |
| 44 | { |
| 45 | Buffer acquired(buf, MutableByteRange(buf.get(), buf.get() + 10)); |
| 46 | EXPECT_EQ(2, buf.use_count()); |
| 47 | Buffer moved(std::move(acquired)); |
| 48 | EXPECT_EQ(2, buf.use_count()); |
| 49 | Buffer assigned; |
| 50 | assigned = std::move(moved); |
| 51 | EXPECT_EQ(2, buf.use_count()); |
| 52 | |
| 53 | Buffer split = assigned.splitAt(5); |
| 54 | EXPECT_EQ(3, buf.use_count()); |
| 55 | |
| 56 | split.advance(1); |
| 57 | assigned.subtract(1); |
| 58 | EXPECT_EQ(3, buf.use_count()); |
| 59 | } |
| 60 | EXPECT_EQ(1, buf.use_count()); |
| 61 | } |
| 62 | |
| 63 | TEST(Buffer, Modifiers) { |
| 64 | Buffer buf(10); |
| 65 | { |
| 66 | unsigned char i = 0; |
| 67 | for (auto& byte : buf.range()) { |
| 68 | byte = i++; |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | auto prefix = buf.splitAt(2); |
| 73 | |
| 74 | ASSERT_EQ(2, prefix.size()); |
| 75 | EXPECT_EQ(0, *prefix.data()); |
| 76 | |
| 77 | ASSERT_EQ(8, buf.size()); |
| 78 | EXPECT_EQ(2, *buf.data()); |
| 79 | |
| 80 | buf.advance(2); |
| 81 | EXPECT_EQ(4, *buf.data()); |
| 82 | |
| 83 | EXPECT_EQ(9, *(buf.range().end() - 1)); |
| 84 | |
| 85 | buf.subtract(2); |
| 86 | EXPECT_EQ(7, *(buf.range().end() - 1)); |
| 87 | |
| 88 | EXPECT_EQ(4, buf.size()); |
| 89 | } |