aboutsummaryrefslogtreecommitdiffhomepage
path: root/tests/Writer32Test.cpp
blob: 4715f7a6131ca877764c81d9a8b6230188c8d5d0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230

/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */



#include "SkRandom.h"
#include "SkReader32.h"
#include "SkWriter32.h"
#include "Test.h"

static void check_contents(skiatest::Reporter* reporter, const SkWriter32& writer,
                           const void* expected, size_t size) {
    SkAutoSMalloc<256> storage(size);
    REPORTER_ASSERT(reporter, writer.bytesWritten() == size);
    writer.flatten(storage.get());
    REPORTER_ASSERT(reporter, !memcmp(storage.get(), expected, size));
}

static void test_rewind(skiatest::Reporter* reporter) {
    SkSWriter32<32> writer(32);
    int32_t array[3] = { 1, 2, 4 };

    REPORTER_ASSERT(reporter, 0 == writer.bytesWritten());
    for (size_t i = 0; i < SK_ARRAY_COUNT(array); ++i) {
        writer.writeInt(array[i]);
    }
    check_contents(reporter, writer, array, sizeof(array));

    writer.rewindToOffset(2*sizeof(int32_t));
    REPORTER_ASSERT(reporter, sizeof(array) - 4 == writer.bytesWritten());
    writer.writeInt(3);
    REPORTER_ASSERT(reporter, sizeof(array) == writer.bytesWritten());
    array[2] = 3;
    check_contents(reporter, writer, array, sizeof(array));

    // test rewinding past allocated chunks. This used to crash because we
    // didn't truncate our link-list after freeing trailing blocks
    {
        SkWriter32 writer(64);
        for (int i = 0; i < 100; ++i) {
            writer.writeInt(i);
        }
        REPORTER_ASSERT(reporter, 100*4 == writer.bytesWritten());
        for (int j = 100*4; j >= 0; j -= 16) {
            writer.rewindToOffset(j);
        }
        REPORTER_ASSERT(reporter, writer.bytesWritten() < 16);
    }
}

static void test_ptr(skiatest::Reporter* reporter) {
    SkSWriter32<32> writer(32);

    void* p0 = reporter;
    void* p1 = &writer;

    // try writing ptrs where at least one of them may be at a non-multiple of
    // 8 boundary, to confirm this works on 64bit machines.

    writer.writePtr(p0);
    writer.write8(0x33);
    writer.writePtr(p1);
    writer.write8(0x66);

    size_t size = writer.size();
    REPORTER_ASSERT(reporter, 2 * sizeof(void*) + 2 * sizeof(int32_t));

    char buffer[32];
    SkASSERT(sizeof(buffer) >= size);
    writer.flatten(buffer);

    SkReader32 reader(buffer, size);
    REPORTER_ASSERT(reporter, reader.readPtr() == p0);
    REPORTER_ASSERT(reporter, reader.readInt() == 0x33);
    REPORTER_ASSERT(reporter, reader.readPtr() == p1);
    REPORTER_ASSERT(reporter, reader.readInt() == 0x66);
}

static void test1(skiatest::Reporter* reporter, SkWriter32* writer) {
    const uint32_t data[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
    for (size_t i = 0; i < SK_ARRAY_COUNT(data); ++i) {
        REPORTER_ASSERT(reporter, i*4 == writer->size());
        writer->write32(data[i]);
        uint32_t* addr = writer->peek32(i * 4);
        REPORTER_ASSERT(reporter, data[i] == *addr);
    }

    char buffer[sizeof(data)];
    REPORTER_ASSERT(reporter, sizeof(buffer) == writer->size());
    writer->flatten(buffer);
    REPORTER_ASSERT(reporter, !memcmp(data, buffer, sizeof(buffer)));
}

static void test2(skiatest::Reporter* reporter, SkWriter32* writer) {
    static const char gStr[] = "abcdefghimjklmnopqrstuvwxyz";
    size_t i;

    size_t len = 0;
    for (i = 0; i <= 26; ++i) {
        len += SkWriter32::WriteStringSize(gStr, i);
        writer->writeString(gStr, i);
    }
    REPORTER_ASSERT(reporter, writer->size() == len);

    SkAutoMalloc storage(len);
    writer->flatten(storage.get());

    SkReader32 reader;
    reader.setMemory(storage.get(), len);
    for (i = 0; i <= 26; ++i) {
        REPORTER_ASSERT(reporter, !reader.eof());
        const char* str = reader.readString(&len);
        REPORTER_ASSERT(reporter, i == len);
        REPORTER_ASSERT(reporter, strlen(str) == len);
        REPORTER_ASSERT(reporter, !memcmp(str, gStr, len));
        // Ensure that the align4 of the string is padded with zeroes.
        size_t alignedSize = SkAlign4(len + 1);
        for (size_t j = len; j < alignedSize; j++) {
            REPORTER_ASSERT(reporter, 0 == str[j]);
        }
    }
    REPORTER_ASSERT(reporter, reader.eof());
}

static void testWritePad(skiatest::Reporter* reporter, SkWriter32* writer) {
    // Create some random data to write.
    const size_t dataSize = 10<<2;
    SkASSERT(SkIsAlign4(dataSize));

    SkAutoMalloc originalData(dataSize);
    {
        SkRandom rand(0);
        uint32_t* ptr = static_cast<uint32_t*>(originalData.get());
        uint32_t* stop = ptr + (dataSize>>2);
        while (ptr < stop) {
            *ptr++ = rand.nextU();
        }

        // Write  the random data to the writer at different lengths for
        // different alignments.
        for (size_t len = 0; len < dataSize; len++) {
            writer->writePad(originalData.get(), len);
        }
    }

    uint32_t totalBytes = writer->size();

    SkAutoMalloc readStorage(totalBytes);
    writer->flatten(readStorage.get());

    SkReader32 reader;
    reader.setMemory(readStorage.get(), totalBytes);

    for (size_t len = 0; len < dataSize; len++) {
        const char* readPtr = static_cast<const char*>(reader.skip(len));
        // Ensure that the data read is the same as what was written.
        REPORTER_ASSERT(reporter, memcmp(readPtr, originalData.get(), len) == 0);
        // Ensure that the rest is padded with zeroes.
        const char* stop = readPtr + SkAlign4(len);
        readPtr += len;
        while (readPtr < stop) {
            REPORTER_ASSERT(reporter, *readPtr++ == 0);
        }
    }
}

static void Tests(skiatest::Reporter* reporter) {
    // dynamic allocator
    {
        SkWriter32 writer(256 * 4);
        REPORTER_ASSERT(reporter, NULL == writer.getSingleBlock());
        test1(reporter, &writer);

        writer.reset();
        test2(reporter, &writer);

        writer.reset();
        testWritePad(reporter, &writer);
    }

    // single-block
    {
        SkWriter32 writer(0);
        uint32_t storage[256];
        REPORTER_ASSERT(reporter, NULL == writer.getSingleBlock());
        writer.reset(storage, sizeof(storage));
        REPORTER_ASSERT(reporter, (void*)storage == writer.getSingleBlock());
        test1(reporter, &writer);

        writer.reset(storage, sizeof(storage));
        test2(reporter, &writer);

        writer.reset(storage, sizeof(storage));
        testWritePad(reporter, &writer);
    }

    // small storage
    {
        SkSWriter32<8 * sizeof(intptr_t)> writer(100);
        test1(reporter, &writer);
        writer.reset(); // should just rewind our storage
        test2(reporter, &writer);

        writer.reset();
        testWritePad(reporter, &writer);
    }

    // large storage
    {
        SkSWriter32<1024 * sizeof(intptr_t)> writer(100);
        test1(reporter, &writer);
        writer.reset(); // should just rewind our storage
        test2(reporter, &writer);

        writer.reset();
        testWritePad(reporter, &writer);
    }

    test_ptr(reporter);
    test_rewind(reporter);
}

#include "TestClassDef.h"
DEFINE_TESTCLASS("Writer32", Writer32Class, Tests)