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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "test.h"
#include <sstream>
#include "irrlichttypes_extrabloated.h"
#include "log.h"
#include "serialization.h"
#include "nodedef.h"
#include "noise.h"
class TestCompression : public TestBase {
public:
TestCompression() { TestManager::registerTestModule(this); }
const char *getName() { return "TestCompression"; }
void runTests(IGameDef *gamedef);
void testRLECompression();
void testZlibCompression();
void testZlibLargeData();
void testZlibLimit();
void _testZlibLimit(u32 size, u32 limit);
};
static TestCompression g_test_instance;
void TestCompression::runTests(IGameDef *gamedef)
{
TEST(testRLECompression);
TEST(testZlibCompression);
TEST(testZlibLargeData);
TEST(testZlibLimit);
}
////////////////////////////////////////////////////////////////////////////////
void TestCompression::testRLECompression()
{
SharedBuffer<u8> fromdata(4);
fromdata[0]=1;
fromdata[1]=5;
fromdata[2]=5;
fromdata[3]=1;
std::ostringstream os(std::ios_base::binary);
compress(fromdata, os, 0);
std::string str_out = os.str();
infostream << "str_out.size()="<<str_out.size()<<std::endl;
infostream << "TestCompress: 1,5,5,1 -> ";
for (char i : str_out)
infostream << (u32) i << ",";
infostream << std::endl;
UASSERT(str_out.size() == 10);
UASSERT(str_out[0] == 0);
UASSERT(str_out[1] == 0);
UASSERT(str_out[2] == 0);
UASSERT(str_out[3] == 4);
UASSERT(str_out[4] == 0);
UASSERT(str_out[5] == 1);
UASSERT(str_out[6] == 1);
UASSERT(str_out[7] == 5);
UASSERT(str_out[8] == 0);
UASSERT(str_out[9] == 1);
std::istringstream is(str_out, std::ios_base::binary);
std::ostringstream os2(std::ios_base::binary);
decompress(is, os2, 0);
std::string str_out2 = os2.str();
infostream << "decompress: ";
for (char i : str_out2)
infostream << (u32) i << ",";
infostream << std::endl;
UASSERTEQ(size_t, str_out2.size(), fromdata.getSize());
for (u32 i = 0; i < str_out2.size(); i++)
UASSERT(str_out2[i] == fromdata[i]);
}
void TestCompression::testZlibCompression()
{
SharedBuffer<u8> fromdata(4);
fromdata[0]=1;
fromdata[1]=5;
fromdata[2]=5;
fromdata[3]=1;
std::ostringstream os(std::ios_base::binary);
compress(fromdata, os, SER_FMT_VER_HIGHEST_READ);
std::string str_out = os.str();
infostream << "str_out.size()=" << str_out.size() <<std::endl;
infostream << "TestCompress: 1,5,5,1 -> ";
for (char i : str_out)
infostream << (u32) i << ",";
infostream << std::endl;
std::istringstream is(str_out, std::ios_base::binary);
std::ostringstream os2(std::ios_base::binary);
decompress(is, os2, SER_FMT_VER_HIGHEST_READ);
std::string str_out2 = os2.str();
infostream << "decompress: ";
for (char i : str_out2)
infostream << (u32) i << ",";
infostream << std::endl;
UASSERTEQ(size_t, str_out2.size(), fromdata.getSize());
for (u32 i = 0; i < str_out2.size(); i++)
UASSERT(str_out2[i] == fromdata[i]);
}
void TestCompression::testZlibLargeData()
{
infostream << "Test: Testing zlib wrappers with a large amount "
"of pseudorandom data" << std::endl;
u32 size = 50000;
infostream << "Test: Input size of large compressZlib is "
<< size << std::endl;
std::string data_in;
data_in.resize(size);
PseudoRandom pseudorandom(9420);
for (u32 i = 0; i < size; i++)
data_in[i] = pseudorandom.range(0, 255);
std::ostringstream os_compressed(std::ios::binary);
compressZlib(data_in, os_compressed);
infostream << "Test: Output size of large compressZlib is "
<< os_compressed.str().size()<<std::endl;
std::istringstream is_compressed(os_compressed.str(), std::ios::binary);
std::ostringstream os_decompressed(std::ios::binary);
decompressZlib(is_compressed, os_decompressed);
infostream << "Test: Output size of large decompressZlib is "
<< os_decompressed.str().size() << std::endl;
std::string str_decompressed = os_decompressed.str();
UASSERTEQ(size_t, str_decompressed.size(), data_in.size());
for (u32 i = 0; i < size && i < str_decompressed.size(); i++) {
UTEST(str_decompressed[i] == data_in[i],
"index out[%i]=%i differs from in[%i]=%i",
i, str_decompressed[i], i, data_in[i]);
}
}
void TestCompression::testZlibLimit()
{
// edge cases
_testZlibLimit(1024, 1023);
_testZlibLimit(1024, 1024);
_testZlibLimit(1024, 1025);
// test around buffer borders
u32 bufsize = 16384; // as in implementation
for (int s = -1; s <= 1; s++)
{
for (int l = -1; l <= 1; l++)
{
_testZlibLimit(bufsize + s, bufsize + l);
}
}
// span multiple buffers
_testZlibLimit(35000, 22000);
_testZlibLimit(22000, 35000);
}
void TestCompression::_testZlibLimit(u32 size, u32 limit)
{
infostream << "Test: Testing zlib wrappers with a decompression "
"memory limit of " << limit << std::endl;
infostream << "Test: Input size of compressZlib for limit is "
<< size << std::endl;
// how much data we expect to get
u32 expected = size < limit ? size : limit;
// create recognizable data
std::string data_in;
data_in.resize(size);
for (u32 i = 0; i < size; i++)
data_in[i] = (u8)(i % 256);
std::ostringstream os_compressed(std::ios::binary);
compressZlib(data_in, os_compressed);
infostream << "Test: Output size of compressZlib for limit is "
<< os_compressed.str().size()<<std::endl;
std::istringstream is_compressed(os_compressed.str(), std::ios::binary);
std::ostringstream os_decompressed(std::ios::binary);
decompressZlib(is_compressed, os_decompressed, limit);
infostream << "Test: Output size of decompressZlib with limit is "
<< os_decompressed.str().size() << std::endl;
std::string str_decompressed = os_decompressed.str();
UASSERTEQ(size_t, str_decompressed.size(), expected);
for (u32 i = 0; i < size && i < str_decompressed.size(); i++) {
UTEST(str_decompressed[i] == data_in[i],
"index out[%i]=%i differs from in[%i]=%i",
i, str_decompressed[i], i, data_in[i]);
}
}
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