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93 lines
2.5 KiB
C++
93 lines
2.5 KiB
C++
/*
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* Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/MemoryStream.h>
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#include <AK/String.h>
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#include <LibTest/TestCase.h>
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TEST_CASE(allocating_memory_stream_empty)
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{
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AllocatingMemoryStream stream;
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EXPECT_EQ(stream.used_buffer_size(), 0ul);
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{
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Array<u8, 32> array;
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auto read_bytes = MUST(stream.read(array));
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EXPECT_EQ(read_bytes.size(), 0ul);
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}
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{
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auto offset = MUST(stream.offset_of("test"sv.bytes()));
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EXPECT(!offset.has_value());
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}
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}
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TEST_CASE(allocating_memory_stream_offset_of)
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{
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AllocatingMemoryStream stream;
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MUST(stream.write_entire_buffer("Well Hello Friends! :^)"sv.bytes()));
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{
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auto offset = MUST(stream.offset_of(" "sv.bytes()));
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EXPECT(offset.has_value());
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EXPECT_EQ(offset.value(), 4ul);
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}
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{
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auto offset = MUST(stream.offset_of("W"sv.bytes()));
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EXPECT(offset.has_value());
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EXPECT_EQ(offset.value(), 0ul);
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}
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{
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auto offset = MUST(stream.offset_of(")"sv.bytes()));
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EXPECT(offset.has_value());
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EXPECT_EQ(offset.value(), 22ul);
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}
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{
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auto offset = MUST(stream.offset_of("-"sv.bytes()));
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EXPECT(!offset.has_value());
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}
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MUST(stream.discard(1));
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{
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auto offset = MUST(stream.offset_of("W"sv.bytes()));
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EXPECT(!offset.has_value());
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}
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{
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auto offset = MUST(stream.offset_of("e"sv.bytes()));
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EXPECT(offset.has_value());
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EXPECT_EQ(offset.value(), 0ul);
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}
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}
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TEST_CASE(allocating_memory_stream_offset_of_oob)
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{
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AllocatingMemoryStream stream;
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// NOTE: This test is to make sure that offset_of() doesn't read past the end of the "initialized" data.
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// So we have to assume some things about the behaviour of this class:
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// - The chunk size is 4096 bytes.
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// - A chunk is moved to the end when it's fully read from
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// - A free chunk is used as-is, no new ones are allocated if one exists.
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// First, fill exactly one chunk.
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for (size_t i = 0; i < 256; ++i)
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MUST(stream.write_entire_buffer("AAAAAAAAAAAAAAAA"sv.bytes()));
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// Then discard it all.
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MUST(stream.discard(4096));
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// Now we can write into this chunk again, knowing that it's initialized to all 'A's.
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MUST(stream.write_entire_buffer("Well Hello Friends! :^)"sv.bytes()));
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{
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auto offset = MUST(stream.offset_of("A"sv.bytes()));
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EXPECT(!offset.has_value());
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}
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}
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