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package SevenZip;
public class LzmaAlone
{
static public class CommandLine
{
public static final int kEncode = 0;
public static final int kDecode = 1;
public static final int kBenchmak = 2;
public int Command = -1;
public int NumBenchmarkPasses = 10;
public int DictionarySize = 1 << 23;
public boolean DictionarySizeIsDefined = false;
public int Lc = 3;
public int Lp = 0;
public int Pb = 2;
public int Fb = 128;
public boolean FbIsDefined = false;
public boolean Eos = false;
public int Algorithm = 2;
public int MatchFinder = 1;
public String InFile;
public String OutFile;
boolean ParseSwitch(String s)
{
if (s.startsWith("d"))
{
DictionarySize = 1 << Integer.parseInt(s.substring(1));
DictionarySizeIsDefined = true;
}
else if (s.startsWith("fb"))
{
Fb = Integer.parseInt(s.substring(2));
FbIsDefined = true;
}
else if (s.startsWith("a"))
Algorithm = Integer.parseInt(s.substring(1));
else if (s.startsWith("lc"))
Lc = Integer.parseInt(s.substring(2));
else if (s.startsWith("lp"))
Lp = Integer.parseInt(s.substring(2));
else if (s.startsWith("pb"))
Pb = Integer.parseInt(s.substring(2));
else if (s.startsWith("eos"))
Eos = true;
else if (s.startsWith("mf"))
{
String mfs = s.substring(2);
if (mfs.equals("bt2"))
MatchFinder = 0;
else if (mfs.equals("bt4"))
MatchFinder = 1;
else if (mfs.equals("bt4b"))
MatchFinder = 2;
else
return false;
}
else
return false;
return true;
}
public boolean Parse(String[] args) throws Exception
{
int pos = 0;
boolean switchMode = true;
for (int i = 0; i < args.length; i++)
{
String s = args[i];
if (s.length() == 0)
return false;
if (switchMode)
{
if (s.compareTo("--") == 0)
{
switchMode = false;
continue;
}
if (s.charAt(0) == '-')
{
String sw = s.substring(1).toLowerCase();
if (sw.length() == 0)
return false;
try
{
if (!ParseSwitch(sw))
return false;
}
catch (NumberFormatException e)
{
return false;
}
continue;
}
}
if (pos == 0)
{
if (s.equalsIgnoreCase("e"))
Command = kEncode;
else if (s.equalsIgnoreCase("d"))
Command = kDecode;
else if (s.equalsIgnoreCase("b"))
Command = kBenchmak;
else
return false;
}
else if(pos == 1)
{
if (Command == kBenchmak)
{
try
{
NumBenchmarkPasses = Integer.parseInt(s);
if (NumBenchmarkPasses < 1)
return false;
}
catch (NumberFormatException e)
{
return false;
}
}
else
InFile = s;
}
else if(pos == 2)
OutFile = s;
else
return false;
pos++;
continue;
}
return true;
}
}
static void PrintHelp()
{
System.out.println(
"\nUsage: LZMA <e|d> [<switches>...] inputFile outputFile\n" +
" e: encode file\n" +
" d: decode file\n" +
" b: Benchmark\n" +
"<Switches>\n" +
// " -a{N}: set compression mode - [0, 1], default: 1 (max)\n" +
" -d{N}: set dictionary - [0,28], default: 23 (8MB)\n" +
" -fb{N}: set number of fast bytes - [5, 273], default: 128\n" +
" -lc{N}: set number of literal context bits - [0, 8], default: 3\n" +
" -lp{N}: set number of literal pos bits - [0, 4], default: 0\n" +
" -pb{N}: set number of pos bits - [0, 4], default: 2\n" +
" -mf{MF_ID}: set Match Finder: [bt2, bt4], default: bt4\n" +
" -eos: write End Of Stream marker\n"
);
}
public static void main(String[] args) throws Exception
{
System.out.println("\nLZMA (Java) 4.61 2008-11-23\n");
if (args.length < 1)
{
PrintHelp();
return;
}
CommandLine params = new CommandLine();
if (!params.Parse(args))
{
System.out.println("\nIncorrect command");
return;
}
if (params.Command == CommandLine.kBenchmak)
{
int dictionary = (1 << 21);
if (params.DictionarySizeIsDefined)
dictionary = params.DictionarySize;
if (params.MatchFinder > 1)
throw new Exception("Unsupported match finder");
SevenZip.LzmaBench.LzmaBenchmark(params.NumBenchmarkPasses, dictionary);
}
else if (params.Command == CommandLine.kEncode || params.Command == CommandLine.kDecode)
{
java.io.File inFile = new java.io.File(params.InFile);
java.io.File outFile = new java.io.File(params.OutFile);
java.io.BufferedInputStream inStream = new java.io.BufferedInputStream(new java.io.FileInputStream(inFile));
java.io.BufferedOutputStream outStream = new java.io.BufferedOutputStream(new java.io.FileOutputStream(outFile));
boolean eos = false;
if (params.Eos)
eos = true;
if (params.Command == CommandLine.kEncode)
{
SevenZip.Compression.LZMA.Encoder encoder = new SevenZip.Compression.LZMA.Encoder();
if (!encoder.SetAlgorithm(params.Algorithm))
throw new Exception("Incorrect compression mode");
if (!encoder.SetDictionarySize(params.DictionarySize))
throw new Exception("Incorrect dictionary size");
if (!encoder.SetNumFastBytes(params.Fb))
throw new Exception("Incorrect -fb value");
if (!encoder.SetMatchFinder(params.MatchFinder))
throw new Exception("Incorrect -mf value");
if (!encoder.SetLcLpPb(params.Lc, params.Lp, params.Pb))
throw new Exception("Incorrect -lc or -lp or -pb value");
encoder.SetEndMarkerMode(eos);
encoder.WriteCoderProperties(outStream);
long fileSize;
if (eos)
fileSize = -1;
else
fileSize = inFile.length();
for (int i = 0; i < 8; i++)
outStream.write((int)(fileSize >>> (8 * i)) & 0xFF);
encoder.Code(inStream, outStream, -1, -1, null);
}
else
{
int propertiesSize = 5;
byte[] properties = new byte[propertiesSize];
if (inStream.read(properties, 0, propertiesSize) != propertiesSize)
throw new Exception("input .lzma file is too short");
SevenZip.Compression.LZMA.Decoder decoder = new SevenZip.Compression.LZMA.Decoder();
if (!decoder.SetDecoderProperties(properties))
throw new Exception("Incorrect stream properties");
long outSize = 0;
for (int i = 0; i < 8; i++)
{
int v = inStream.read();
if (v < 0)
throw new Exception("Can't read stream size");
outSize |= ((long)v) << (8 * i);
}
if (!decoder.Code(inStream, outStream, outSize))
throw new Exception("Error in data stream");
}
outStream.flush();
outStream.close();
inStream.close();
}
else
throw new Exception("Incorrect command");
return;
}
}
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