#include <tiffimage_int.hpp>

#include "gtestwrapper.h"

#include <sstream>

using namespace Exiv2;

static const byte tiffLittleEndian[] = {0x49, 0x49, 0x2a, 0x00, 0x10, 0x00, 0x00, 0x00};

class ATiffHeader: public ::testing::Test

{

public:

    Internal::TiffHeader header;

};

TEST_F(ATiffHeader, hasExpectedValuesAfterCreation)

{

    ASSERT_EQ(8u, header.size());

    ASSERT_EQ(42, header.tag());

    ASSERT_EQ(8u, header.offset());

    ASSERT_EQ(littleEndian, header.byteOrder());

}

TEST_F(ATiffHeader, canBeWrittenAndItsSizeIs8Bytes)

{

    DataBuf buffer = header.write();

    ASSERT_EQ(header.size(), buffer.size_);

    ASSERT_EQ(8u, header.size());

}

TEST_F(ATiffHeader, readDataFromBufferWithCorrectSize)

{

    ASSERT_TRUE(header.read(tiffLittleEndian, 8));

}

TEST_F(ATiffHeader, failToReadDataFromBufferWithCorrectSizeButNull)

{

    ASSERT_FALSE(header.read(NULL, 8));

}

TEST_F(ATiffHeader, failToReadDataFromBufferWithSizeDifferentThan8)

{

    ASSERT_FALSE(header.read(NULL, 7));

    ASSERT_FALSE(header.read(NULL, 9));

}

TEST_F(ATiffHeader, failToReadDataFromBufferWithInvalidByteOrder)

{

    static const byte bufferInvalidByteOrder[] =  {0x88, 0x49, 0x2a, 0x00, 0x10, 0x00, 0x00, 0x00};

    ASSERT_FALSE(header.read(bufferInvalidByteOrder, 8));

}

TEST_F(ATiffHeader, failToReadDataFromBufferWithInvalidTag)

{

    static const byte bufferInvalidTag[] = {0x49, 0x49, 0x29, 0x00, 0x10, 0x00, 0x00, 0x00};

    ASSERT_FALSE(header.read(bufferInvalidTag, 8));

}

TEST_F(ATiffHeader, printsDefaultValues)

{

    std::ostringstream str;

    header.print(str, "");

    ASSERT_STREQ("TIFF header, offset = 0x00000008, little endian encoded\n", str.str().c_str());

}