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/*
* 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 <stdlib.h>
#include <string.h>
#include "SkData.h"
#include "SkFlate.h"
#include "SkStream.h"
#include "Test.h"
// A memory stream that reports zero size with the standard call, like
// an unseekable file stream would.
class SkZeroSizeMemStream : 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, SkZeroSizeMemStream::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);
SkAutoDataUnref data1(compressed.copyToData());
testStream->setData(data1.get())->unref();
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, SkZeroSizeMemStream::kGetSizeKey);
REPORTER_ASSERT(reporter, data1->size() == inputSize);
REPORTER_ASSERT(reporter, memcmp(testStream->getMemoryBase(),
data1->data(),
data1->size()) == 0);
// Check that the uncompressed data matches the source data.
SkAutoDataUnref data2(uncompressed.copyToData());
REPORTER_ASSERT(reporter, testData.getLength() == uncompressed.getOffset());
REPORTER_ASSERT(reporter, memcmp(testData.getMemoryBase(),
data2->data(),
testData.getLength()) == 0);
}
DEF_TEST(Flate, reporter) {
TestFlate(reporter, NULL, 0);
#if defined(SK_ZLIB_INCLUDE) && !defined(SK_DEBUG)
REPORTER_ASSERT(reporter, SkFlate::HaveFlate());
SkMemoryStream memStream;
TestFlate(reporter, &memStream, 512);
TestFlate(reporter, &memStream, 10240);
SkZeroSizeMemStream fileStream;
TestFlate(reporter, &fileStream, 512);
TestFlate(reporter, &fileStream, 10240);
#endif
}
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