1 /*

     2  * Copyright (C) 2010 Google Inc. All rights reserved.

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    16  * this software without specific prior written permission.

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    20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

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    28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    29  */

    30 

    31 #include "config.h"

    32 

    33 #include <gtest/gtest.h>

    34 

    35 #include "PlatformString.h"

    36 #include "UniscribeHelper.h"

    37 

    38 using namespace WebCore;

    39 

    40 namespace {

    41 

    42 class UniscribeTest : public testing::Test {

    43 public:

    44     UniscribeTest()

    45     {

    46     }

    47 

    48     // Returns an HFONT with the given name. The caller does not have to free

    49     // this, it will be automatically freed at the end of the test. Returns 0

    50     // on failure. On success, the

    51     HFONT MakeFont(const wchar_t* fontName, SCRIPT_CACHE** cache)

    52     {

    53         LOGFONT lf;

    54         memset(&lf, 0, sizeof(LOGFONT));

    55         lf.lfHeight = 20;

    56         wcscpy_s(lf.lfFaceName, fontName);

    57 

    58         HFONT hfont = CreateFontIndirect(&lf);

    59         if (!hfont)

    60             return 0;

    61 

    62         *cache = new SCRIPT_CACHE;

    63         **cache = 0;

    64         createdFonts.append(std::make_pair(hfont, *cache));

    65         return hfont;

    66     }

    67 

    68 protected:

    69     // Default font properties structure for tests to use.

    70     SCRIPT_FONTPROPERTIES properties;

    71 

    72 private:

    73     virtual void SetUp()

    74     {

    75         memset(&properties, 0, sizeof(SCRIPT_FONTPROPERTIES));

    76         properties.cBytes = sizeof(SCRIPT_FONTPROPERTIES);

    77         properties.wgBlank = ' ';

    78         properties.wgDefault = '?'; // Used when the char is not in the font.

    79         properties.wgInvalid = '#'; // Used for invalid characters.

    80     }

    81 

    82     virtual void TearDown()

    83     {

    84         // Free any allocated fonts.

    85         for (size_t i = 0; i < createdFonts.size(); i++) {

    86             DeleteObject(createdFonts[i].first);

    87             ScriptFreeCache(createdFonts[i].second);

    88             delete createdFonts[i].second;

    89         }

    90         createdFonts.clear();

    91     }

    92 

    93     // Tracks allocated fonts so we can delete them at the end of the test.

    94     // The script cache pointer is heap allocated and must be freed.

    95     Vector< std::pair<HFONT, SCRIPT_CACHE*> > createdFonts;

    96 };

    97 

    98 } // namespace

    99 

   100 // This test tests giving Uniscribe a very large buffer, which will cause a

   101 // failure.

   102 TEST_F(UniscribeTest, TooBig)

   103 {

   104     // Make a large string with an e with a zillion combining accents.

   105     String input(L"e");

   106     for (int i = 0; i < 100000; i++)

   107         input.append(static_cast<UChar>(0x301)); // Combining acute accent.

   108 

   109     SCRIPT_CACHE* scriptCache;

   110     HFONT hfont = MakeFont(L"Times New Roman", &scriptCache);

   111     ASSERT_TRUE(hfont);

   112 

   113     // Test a long string without the normal length protection we have. This

   114     // will cause shaping to fail.

   115     {

   116         UniscribeHelper uniscribe(

   117             input.characters(), static_cast<int>(input.length()),

   118             false, hfont, scriptCache, &properties);

   119         uniscribe.initWithOptionalLengthProtection(false);

   120 

   121         // There should be one shaping entry, with nothing in it.

   122         ASSERT_EQ(1, uniscribe.m_shapes.size());

   123         EXPECT_EQ(0, uniscribe.m_shapes[0].m_glyphs.size());

   124         EXPECT_EQ(0, uniscribe.m_shapes[0].m_logs.size());

   125         EXPECT_EQ(0, uniscribe.m_shapes[0].m_visualAttributes.size());

   126         EXPECT_EQ(0, uniscribe.m_shapes[0].m_advance.size());

   127         EXPECT_EQ(0, uniscribe.m_shapes[0].m_offsets.size());

   128         EXPECT_EQ(0, uniscribe.m_shapes[0].m_justify.size());

   129         EXPECT_EQ(0, uniscribe.m_shapes[0].m_abc.abcA);

   130         EXPECT_EQ(0, uniscribe.m_shapes[0].m_abc.abcB);

   131         EXPECT_EQ(0, uniscribe.m_shapes[0].m_abc.abcC);

   132 

   133         // The sizes of the other stuff should match the shaping entry.

   134         EXPECT_EQ(1, uniscribe.m_runs.size());

   135         EXPECT_EQ(1, uniscribe.m_screenOrder.size());

   136 

   137         // Check that the various querying functions handle the empty case

   138         // properly.

   139         EXPECT_EQ(0, uniscribe.width());

   140         EXPECT_EQ(0, uniscribe.firstGlyphForCharacter(0));

   141         EXPECT_EQ(0, uniscribe.firstGlyphForCharacter(1000));

   142         EXPECT_EQ(0, uniscribe.xToCharacter(0));

   143         EXPECT_EQ(0, uniscribe.xToCharacter(1000));

   144     }

   145 

   146     // Now test the very large string and make sure it is handled properly by

   147     // the length protection.

   148     {

   149         UniscribeHelper uniscribe(

   150             input.characters(), static_cast<int>(input.length()),

   151             false, hfont, scriptCache, &properties);

   152         uniscribe.initWithOptionalLengthProtection(true);

   153 

   154         // There should be 0 runs and shapes.

   155         EXPECT_EQ(0, uniscribe.m_runs.size());

   156         EXPECT_EQ(0, uniscribe.m_shapes.size());

   157         EXPECT_EQ(0, uniscribe.m_screenOrder.size());

   158 

   159         EXPECT_EQ(0, uniscribe.width());

   160         EXPECT_EQ(0, uniscribe.firstGlyphForCharacter(0));

   161         EXPECT_EQ(0, uniscribe.firstGlyphForCharacter(1000));

   162         EXPECT_EQ(0, uniscribe.xToCharacter(0));

   163         EXPECT_EQ(0, uniscribe.xToCharacter(1000));

   164     }

   165 }