Source/core/xml/parser/SharedBufferReaderTest.cpp

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#include "config.h"
#include "core/xml/parser/SharedBufferReader.h"

#include "platform/SharedBuffer.h"

#include <algorithm>
#include <cstdlib>
#include <gtest/gtest.h>
#include <vector>

namespace WebCore {

TEST(SharedBufferReaderTest, readDataWithNullSharedBuffer)
{
    SharedBufferReader reader(nullptr);
    char buffer[32];

    EXPECT_EQ(0, reader.readData(buffer, sizeof(buffer)));
}

TEST(SharedBufferReaderTest, readDataWith0BytesRequest)
{
    RefPtr<SharedBuffer> sharedBuffer = SharedBuffer::create();
    SharedBufferReader reader(sharedBuffer);

    EXPECT_EQ(0, reader.readData(0, 0));
}

TEST(SharedBufferReaderTest, readDataWithSizeBiggerThanSharedBufferSize)
{
    static const char testData[] = "hello";
    RefPtr<SharedBuffer> sharedBuffer = SharedBuffer::create(testData, sizeof(testData));

    SharedBufferReader reader(sharedBuffer);

    const int extraBytes = 3;
    char outputBuffer[sizeof(testData) + extraBytes];

    const char initializationByte = 'a';
    memset(outputBuffer, initializationByte, sizeof(outputBuffer));
    EXPECT_EQ(sizeof(testData),
        static_cast<size_t>(reader.readData(outputBuffer, sizeof(outputBuffer))));

    EXPECT_TRUE(std::equal(testData, testData + sizeof(testData), outputBuffer));
    // Check that the bytes past index sizeof(testData) were not touched.
    EXPECT_EQ(extraBytes,
        std::count(outputBuffer, outputBuffer + sizeof(outputBuffer), initializationByte));
}

TEST(SharedBufferReaderTest, readDataInMultiples)
{
    const int iterationsCount = 8;
    const int bytesPerIteration = 64;

    std::vector<char> testData(iterationsCount * bytesPerIteration);
    std::generate(testData.begin(), testData.end(), &std::rand);

    RefPtr<SharedBuffer> sharedBuffer = SharedBuffer::create(&testData[0], testData.size());
    SharedBufferReader reader(sharedBuffer);

    std::vector<char> destinationVector(testData.size());

    for (int i = 0; i < iterationsCount; ++i) {
        const int offset = i * bytesPerIteration;
        const int bytesRead = reader.readData(&destinationVector[0] + offset, bytesPerIteration);
        EXPECT_EQ(bytesPerIteration, bytesRead);
    }

    EXPECT_TRUE(std::equal(testData.begin(), testData.end(), destinationVector.begin()));
}

TEST(SharedBufferReaderTest, clearSharedBufferBetweenCallsToReadData)
{
    std::vector<char> testData(128);
    std::generate(testData.begin(), testData.end(), &std::rand);

    RefPtr<SharedBuffer> sharedBuffer = SharedBuffer::create(&testData[0], testData.size());
    SharedBufferReader reader(sharedBuffer);

    std::vector<char> destinationVector(testData.size());
    const int bytesToRead = testData.size() / 2;
    EXPECT_EQ(bytesToRead, reader.readData(&destinationVector[0], bytesToRead));

    sharedBuffer->clear();

    EXPECT_EQ(0, reader.readData(&destinationVector[0], bytesToRead));
}

} // namespace WebCore