public static int LzmaBenchmark(int numIterations, int dictionarySize) throws Exception {
if (numIterations <= 0) return 0;
if (dictionarySize < (1 << 18)) {
System.out.println("\nError: dictionary size for benchmark must be >= 18 (256 KB)");
return 1;
}
System.out.print("\n Compressing Decompressing\n\n");
SevenZip.Compression.LZMA.Encoder encoder = new SevenZip.Compression.LZMA.Encoder();
SevenZip.Compression.LZMA.Decoder decoder = new SevenZip.Compression.LZMA.Decoder();
if (!encoder.SetDictionarySize(dictionarySize))
throw new Exception("Incorrect dictionary size");
int kBufferSize = dictionarySize + kAdditionalSize;
int kCompressedBufferSize = (kBufferSize / 2) + kCompressedAdditionalSize;
ByteArrayOutputStream propStream = new ByteArrayOutputStream();
encoder.WriteCoderProperties(propStream);
byte[] propArray = propStream.toByteArray();
decoder.SetDecoderProperties(propArray);
CBenchRandomGenerator rg = new CBenchRandomGenerator();
rg.Set(kBufferSize);
rg.Generate();
CRC crc = new CRC();
crc.Init();
crc.Update(rg.Buffer, 0, rg.BufferSize);
CProgressInfo progressInfo = new CProgressInfo();
progressInfo.ApprovedStart = dictionarySize;
long totalBenchSize = 0;
long totalEncodeTime = 0;
long totalDecodeTime = 0;
long totalCompressedSize = 0;
MyInputStream inStream = new MyInputStream(rg.Buffer, rg.BufferSize);
byte[] compressedBuffer = new byte[kCompressedBufferSize];
MyOutputStream compressedStream = new MyOutputStream(compressedBuffer);
CrcOutStream crcOutStream = new CrcOutStream();
MyInputStream inputCompressedStream = null;
int compressedSize = 0;
for (int i = 0; i < numIterations; i++) {
progressInfo.Init();
inStream.reset();
compressedStream.reset();
encoder.Code(inStream, compressedStream, -1, -1, progressInfo);
long encodeTime = System.currentTimeMillis() - progressInfo.Time;
if (i == 0) {
compressedSize = compressedStream.size();
inputCompressedStream = new MyInputStream(compressedBuffer, compressedSize);
} else if (compressedSize != compressedStream.size()) throw (new Exception("Encoding error"));
if (progressInfo.InSize == 0) throw (new Exception("Internal ERROR 1282"));
long decodeTime = 0;
for (int j = 0; j < 2; j++) {
inputCompressedStream.reset();
crcOutStream.Init();
long outSize = kBufferSize;
long startTime = System.currentTimeMillis();
if (!decoder.Code(inputCompressedStream, crcOutStream, outSize))
throw (new Exception("Decoding Error"));
decodeTime = System.currentTimeMillis() - startTime;
if (crcOutStream.GetDigest() != crc.GetDigest()) throw (new Exception("CRC Error"));
}
long benchSize = kBufferSize - progressInfo.InSize;
PrintResults(dictionarySize, encodeTime, benchSize, false, 0);
System.out.print(" ");
PrintResults(dictionarySize, decodeTime, kBufferSize, true, compressedSize);
System.out.println();
totalBenchSize += benchSize;
totalEncodeTime += encodeTime;
totalDecodeTime += decodeTime;
totalCompressedSize += compressedSize;
}
System.out.println("---------------------------------------------------");
PrintResults(dictionarySize, totalEncodeTime, totalBenchSize, false, 0);
System.out.print(" ");
PrintResults(
dictionarySize,
totalDecodeTime,
kBufferSize * (long) numIterations,
true,
totalCompressedSize);
System.out.println(" Average");
return 0;
}
public void Init() {
CRC.Init();
}