1
2 /*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9
10 #include <stdlib.h>
11 #include <string.h>
12
13 #include "Test.h"
14 #include "SkData.h"
15 #include "SkFlate.h"
16 #include "SkStream.h"
17
18 // A memory stream that reports zero size with the standard call, like
19 // an unseekable file stream would.
20 class SkZeroSizeMemStream : public SkMemoryStream {
21 public:
read(void * buffer,size_t size)22 virtual size_t read(void* buffer, size_t size) {
23 if (buffer == NULL && size == 0)
24 return 0;
25 if (buffer == NULL && size == kGetSizeKey)
26 size = 0;
27 return SkMemoryStream::read(buffer, size);
28 }
29
30 static const size_t kGetSizeKey = 0xDEADBEEF;
31 };
32
TestFlate(skiatest::Reporter * reporter,SkMemoryStream * testStream,size_t dataSize)33 static void TestFlate(skiatest::Reporter* reporter, SkMemoryStream* testStream,
34 size_t dataSize) {
35 if (testStream == NULL)
36 return;
37
38 SkMemoryStream testData(dataSize);
39 uint8_t* data = (uint8_t*)testData.getMemoryBase();
40 srand(0); // Make data deterministic.
41 for (size_t i = 0; i < dataSize; i++)
42 data[i] = rand() & 0xFF;
43
44 testStream->setMemory(testData.getMemoryBase(), dataSize, true);
45 SkDynamicMemoryWStream compressed;
46 bool status = SkFlate::Deflate(testStream, &compressed);
47 REPORTER_ASSERT(reporter, status);
48
49 // Check that the input data wasn't changed.
50 size_t inputSize = testStream->getLength();
51 if (inputSize == 0)
52 inputSize = testStream->read(NULL, SkZeroSizeMemStream::kGetSizeKey);
53 REPORTER_ASSERT(reporter, testData.getLength() == inputSize);
54 REPORTER_ASSERT(reporter, memcmp(testData.getMemoryBase(),
55 testStream->getMemoryBase(),
56 testData.getLength()) == 0);
57
58 // Assume there are two test sizes, big and small.
59 if (dataSize < 1024)
60 REPORTER_ASSERT(reporter, compressed.getOffset() < 1024);
61 else
62 REPORTER_ASSERT(reporter, compressed.getOffset() > 1024);
63
64 SkAutoDataUnref data1(compressed.copyToData());
65
66 testStream->setData(data1.get())->unref();
67 SkDynamicMemoryWStream uncompressed;
68 status = SkFlate::Inflate(testStream, &uncompressed);
69 REPORTER_ASSERT(reporter, status);
70
71 // Check that the input data wasn't changed.
72 inputSize = testStream->getLength();
73 if (inputSize == 0)
74 inputSize = testStream->read(NULL, SkZeroSizeMemStream::kGetSizeKey);
75 REPORTER_ASSERT(reporter, data1->size() == inputSize);
76 REPORTER_ASSERT(reporter, memcmp(testStream->getMemoryBase(),
77 data1->data(),
78 data1->size()) == 0);
79
80 // Check that the uncompressed data matches the source data.
81 SkAutoDataUnref data2(uncompressed.copyToData());
82 REPORTER_ASSERT(reporter, testData.getLength() == uncompressed.getOffset());
83 REPORTER_ASSERT(reporter, memcmp(testData.getMemoryBase(),
84 data2->data(),
85 testData.getLength()) == 0);
86 }
87
TestFlateCompression(skiatest::Reporter * reporter)88 static void TestFlateCompression(skiatest::Reporter* reporter) {
89 TestFlate(reporter, NULL, 0);
90 #if defined(SK_ZLIB_INCLUDE) && !defined(SK_DEBUG)
91 REPORTER_ASSERT(reporter, SkFlate::HaveFlate());
92
93 SkMemoryStream memStream;
94 TestFlate(reporter, &memStream, 512);
95 TestFlate(reporter, &memStream, 10240);
96
97 SkZeroSizeMemStream fileStream;
98 TestFlate(reporter, &fileStream, 512);
99 TestFlate(reporter, &fileStream, 10240);
100 #endif
101 }
102
103 #include "TestClassDef.h"
104 DEFINE_TESTCLASS("Flate", FlateTestClass, TestFlateCompression)
105