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127 lines
3.3 KiB
C++
127 lines
3.3 KiB
C++
/*
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* Unit tests for class RewindInputStream.
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*/
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#include "input/RewindInputStream.hxx"
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#include "input/InputStream.hxx"
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#include "thread/Mutex.hxx"
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#include <gtest/gtest.h>
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#include <string.h>
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class StringInputStream final : public InputStream {
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const char *data;
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size_t remaining;
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public:
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StringInputStream(const char *_uri,
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Mutex &_mutex,
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const char *_data)
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:InputStream(_uri, _mutex),
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data(_data), remaining(strlen(data)) {
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SetReady();
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}
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/* virtual methods from InputStream */
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bool IsEOF() const noexcept override {
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return remaining == 0;
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}
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size_t Read(std::unique_lock<Mutex> &,
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std::span<std::byte> dest) override {
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size_t nbytes = std::min(remaining, dest.size());
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memcpy(dest.data(), data, nbytes);
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data += nbytes;
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remaining -= nbytes;
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offset += nbytes;
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return nbytes;
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}
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};
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TEST(RewindInputStream, Basic)
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{
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Mutex mutex;
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auto *sis =
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new StringInputStream("foo://", mutex,
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"foo bar");
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EXPECT_TRUE(sis->IsReady());
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auto ris = input_rewind_open(InputStreamPtr(sis));
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EXPECT_TRUE(ris.get() != sis);
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EXPECT_TRUE(ris != nullptr);
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std::unique_lock lock{mutex};
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ris->Update();
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EXPECT_TRUE(ris->IsReady());
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EXPECT_FALSE(ris->KnownSize());
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EXPECT_EQ(offset_type(0), ris->GetOffset());
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char buffer[16];
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size_t nbytes = ris->Read(lock, std::as_writable_bytes(std::span{buffer}.first(2)));
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EXPECT_EQ(size_t(2), nbytes);
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EXPECT_EQ('f', buffer[0]);
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EXPECT_EQ('o', buffer[1]);
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EXPECT_EQ(offset_type(2), ris->GetOffset());
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EXPECT_FALSE(ris->IsEOF());
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nbytes = ris->Read(lock, std::as_writable_bytes(std::span{buffer}.first(2)));
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EXPECT_EQ(size_t(2), nbytes);
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EXPECT_EQ('o', buffer[0]);
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EXPECT_EQ(' ', buffer[1]);
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EXPECT_EQ(offset_type(4), ris->GetOffset());
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EXPECT_FALSE(ris->IsEOF());
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ris->Seek(lock, 1);
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EXPECT_EQ(offset_type(1), ris->GetOffset());
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EXPECT_FALSE(ris->IsEOF());
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nbytes = ris->Read(lock, std::as_writable_bytes(std::span{buffer}.first(2)));
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EXPECT_EQ(size_t(2), nbytes);
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EXPECT_EQ('o', buffer[0]);
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EXPECT_EQ('o', buffer[1]);
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EXPECT_EQ(offset_type(3), ris->GetOffset());
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EXPECT_FALSE(ris->IsEOF());
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ris->Seek(lock, 0);
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EXPECT_EQ(offset_type(0), ris->GetOffset());
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EXPECT_FALSE(ris->IsEOF());
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nbytes = ris->Read(lock, std::as_writable_bytes(std::span{buffer}.first(2)));
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EXPECT_EQ(size_t(2), nbytes);
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EXPECT_EQ('f', buffer[0]);
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EXPECT_EQ('o', buffer[1]);
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EXPECT_EQ(offset_type(2), ris->GetOffset());
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EXPECT_FALSE(ris->IsEOF());
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nbytes = ris->Read(lock, std::as_writable_bytes(std::span{buffer}));
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EXPECT_EQ(size_t(2), nbytes);
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EXPECT_EQ('o', buffer[0]);
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EXPECT_EQ(' ', buffer[1]);
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EXPECT_EQ(offset_type(4), ris->GetOffset());
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EXPECT_FALSE(ris->IsEOF());
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nbytes = ris->Read(lock, std::as_writable_bytes(std::span{buffer}));
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EXPECT_EQ(size_t(3), nbytes);
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EXPECT_EQ('b', buffer[0]);
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EXPECT_EQ('a', buffer[1]);
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EXPECT_EQ('r', buffer[2]);
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EXPECT_EQ(offset_type(7), ris->GetOffset());
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EXPECT_TRUE(ris->IsEOF());
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ris->Seek(lock, 3);
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EXPECT_EQ(offset_type(3), ris->GetOffset());
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EXPECT_FALSE(ris->IsEOF());
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nbytes = ris->Read(lock, std::as_writable_bytes(std::span{buffer}));
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EXPECT_EQ(size_t(4), nbytes);
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EXPECT_EQ(' ', buffer[0]);
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EXPECT_EQ('b', buffer[1]);
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EXPECT_EQ('a', buffer[2]);
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EXPECT_EQ('r', buffer[3]);
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EXPECT_EQ(offset_type(7), ris->GetOffset());
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EXPECT_TRUE(ris->IsEOF());
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}
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