skia2/tests/FlateTest.cpp
vandebo@chromium.org ee34e35c8c Add flate compression test and fix bugs.
Review URL: http://codereview.appspot.com/3393041

git-svn-id: http://skia.googlecode.com/svn/trunk@628 2bbb7eff-a529-9590-31e7-b0007b416f81
2010-12-02 22:55:33 +00:00

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3.9 KiB
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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include <string.h>
#include "Test.h"
#include "SkFlate.h"
#include "SkStream.h"
// A memory stream that reports zero size with the standard call, like
// an unseekable file stream would.
class SkSimulatedFileStream : public SkMemoryStream {
public:
virtual size_t read(void* buffer, size_t size) {
if (buffer == NULL && size == 0)
return 0;
if (buffer == NULL && size == kGetSizeKey)
size = 0;
return SkMemoryStream::read(buffer, size);
}
static const size_t kGetSizeKey = 0xDEADBEEF;
};
static void TestFlate(skiatest::Reporter* reporter, SkMemoryStream* testStream,
size_t dataSize) {
if (testStream == NULL)
return;
SkMemoryStream testData(dataSize);
uint8_t* data = (uint8_t*)testData.getMemoryBase();
srand(0); // Make data deterministic.
for (size_t i = 0; i < dataSize; i++)
data[i] = rand() & 0xFF;
testStream->setMemory(testData.getMemoryBase(), dataSize, true);
SkDynamicMemoryWStream compressed;
bool status = SkFlate::Deflate(testStream, &compressed);
REPORTER_ASSERT(reporter, status);
// Check that the input data wasn't changed.
size_t inputSize = testStream->getLength();
if (inputSize == 0)
inputSize = testStream->read(NULL, SkSimulatedFileStream::kGetSizeKey);
REPORTER_ASSERT(reporter, testData.getLength() == inputSize);
REPORTER_ASSERT(reporter, memcmp(testData.getMemoryBase(),
testStream->getMemoryBase(),
testData.getLength()) == 0);
// Assume there are two test sizes, big and small.
if (dataSize < 1024)
REPORTER_ASSERT(reporter, compressed.getOffset() < 1024);
else
REPORTER_ASSERT(reporter, compressed.getOffset() > 1024);
testStream->setMemory(compressed.getStream(), compressed.getOffset(), true);
SkDynamicMemoryWStream uncompressed;
status = SkFlate::Inflate(testStream, &uncompressed);
REPORTER_ASSERT(reporter, status);
// Check that the input data wasn't changed.
inputSize = testStream->getLength();
if (inputSize == 0)
inputSize = testStream->read(NULL, SkSimulatedFileStream::kGetSizeKey);
REPORTER_ASSERT(reporter, compressed.getOffset() == inputSize);
REPORTER_ASSERT(reporter, memcmp(testStream->getMemoryBase(),
compressed.getStream(),
compressed.getOffset()) == 0);
// Check that the uncompressed data matches the source data.
REPORTER_ASSERT(reporter, testData.getLength() == uncompressed.getOffset());
REPORTER_ASSERT(reporter, memcmp(testData.getMemoryBase(),
uncompressed.getStream(),
testData.getLength()) == 0);
}
static void TestFlateCompression(skiatest::Reporter* reporter) {
TestFlate(reporter, NULL, 0);
#ifdef SK_ZLIB_INCLUDE
REPORTER_ASSERT(reporter, SkFlate::HaveFlate());
SkMemoryStream memStream;
TestFlate(reporter, &memStream, 512);
TestFlate(reporter, &memStream, 10240);
SkSimulatedFileStream fileStream;
TestFlate(reporter, &fileStream, 512);
TestFlate(reporter, &fileStream, 10240);
#endif
}
#include "TestClassDef.h"
DEFINE_TESTCLASS("Flate", FlateTestClass, TestFlateCompression)