254 lines
6.6 KiB
Java
254 lines
6.6 KiB
Java
package SevenZip;
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public class LzmaAlone
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{
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static public class CommandLine
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{
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public static final int kEncode = 0;
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public static final int kDecode = 1;
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public static final int kBenchmak = 2;
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public int Command = -1;
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public int NumBenchmarkPasses = 10;
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public int DictionarySize = 1 << 23;
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public boolean DictionarySizeIsDefined = false;
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public int Lc = 3;
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public int Lp = 0;
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public int Pb = 2;
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public int Fb = 128;
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public boolean FbIsDefined = false;
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public boolean Eos = false;
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public int Algorithm = 2;
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public int MatchFinder = 1;
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public String InFile;
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public String OutFile;
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boolean ParseSwitch(String s)
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{
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if (s.startsWith("d"))
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{
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DictionarySize = 1 << Integer.parseInt(s.substring(1));
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DictionarySizeIsDefined = true;
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}
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else if (s.startsWith("fb"))
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{
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Fb = Integer.parseInt(s.substring(2));
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FbIsDefined = true;
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}
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else if (s.startsWith("a"))
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Algorithm = Integer.parseInt(s.substring(1));
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else if (s.startsWith("lc"))
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Lc = Integer.parseInt(s.substring(2));
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else if (s.startsWith("lp"))
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Lp = Integer.parseInt(s.substring(2));
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else if (s.startsWith("pb"))
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Pb = Integer.parseInt(s.substring(2));
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else if (s.startsWith("eos"))
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Eos = true;
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else if (s.startsWith("mf"))
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{
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String mfs = s.substring(2);
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if (mfs.equals("bt2"))
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MatchFinder = 0;
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else if (mfs.equals("bt4"))
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MatchFinder = 1;
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else if (mfs.equals("bt4b"))
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MatchFinder = 2;
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else
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return false;
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}
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else
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return false;
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return true;
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}
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public boolean Parse(String[] args) throws Exception
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{
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int pos = 0;
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boolean switchMode = true;
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for (int i = 0; i < args.length; i++)
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{
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String s = args[i];
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if (s.length() == 0)
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return false;
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if (switchMode)
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{
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if (s.compareTo("--") == 0)
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{
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switchMode = false;
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continue;
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}
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if (s.charAt(0) == '-')
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{
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String sw = s.substring(1).toLowerCase();
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if (sw.length() == 0)
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return false;
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try
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{
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if (!ParseSwitch(sw))
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return false;
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}
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catch (NumberFormatException e)
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{
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return false;
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}
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continue;
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}
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}
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if (pos == 0)
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{
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if (s.equalsIgnoreCase("e"))
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Command = kEncode;
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else if (s.equalsIgnoreCase("d"))
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Command = kDecode;
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else if (s.equalsIgnoreCase("b"))
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Command = kBenchmak;
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else
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return false;
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}
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else if(pos == 1)
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{
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if (Command == kBenchmak)
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{
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try
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{
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NumBenchmarkPasses = Integer.parseInt(s);
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if (NumBenchmarkPasses < 1)
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return false;
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}
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catch (NumberFormatException e)
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{
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return false;
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}
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}
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else
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InFile = s;
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}
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else if(pos == 2)
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OutFile = s;
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else
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return false;
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pos++;
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continue;
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}
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return true;
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}
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}
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static void PrintHelp()
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{
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System.out.println(
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"\nUsage: LZMA <e|d> [<switches>...] inputFile outputFile\n" +
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" e: encode file\n" +
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" d: decode file\n" +
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" b: Benchmark\n" +
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"<Switches>\n" +
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// " -a{N}: set compression mode - [0, 1], default: 1 (max)\n" +
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" -d{N}: set dictionary - [0,28], default: 23 (8MB)\n" +
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" -fb{N}: set number of fast bytes - [5, 273], default: 128\n" +
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" -lc{N}: set number of literal context bits - [0, 8], default: 3\n" +
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" -lp{N}: set number of literal pos bits - [0, 4], default: 0\n" +
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" -pb{N}: set number of pos bits - [0, 4], default: 2\n" +
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" -mf{MF_ID}: set Match Finder: [bt2, bt4], default: bt4\n" +
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" -eos: write End Of Stream marker\n"
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);
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}
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public static void main(String[] args) throws Exception
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{
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System.out.println("\nLZMA (Java) 4.42 Copyright (c) 1999-2006 Igor Pavlov 2006-05-15\n");
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if (args.length < 1)
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{
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PrintHelp();
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return;
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}
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CommandLine params = new CommandLine();
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if (!params.Parse(args))
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{
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System.out.println("\nIncorrect command");
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return;
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}
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if (params.Command == CommandLine.kBenchmak)
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{
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int dictionary = (1 << 21);
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if (params.DictionarySizeIsDefined)
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dictionary = params.DictionarySize;
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if (params.MatchFinder > 1)
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throw new Exception("Unsupported match finder");
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SevenZip.LzmaBench.LzmaBenchmark(params.NumBenchmarkPasses, dictionary);
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}
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else if (params.Command == CommandLine.kEncode || params.Command == CommandLine.kDecode)
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{
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java.io.File inFile = new java.io.File(params.InFile);
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java.io.File outFile = new java.io.File(params.OutFile);
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java.io.BufferedInputStream inStream = new java.io.BufferedInputStream(new java.io.FileInputStream(inFile));
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java.io.BufferedOutputStream outStream = new java.io.BufferedOutputStream(new java.io.FileOutputStream(outFile));
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boolean eos = false;
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if (params.Eos)
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eos = true;
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if (params.Command == CommandLine.kEncode)
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{
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SevenZip.Compression.LZMA.Encoder encoder = new SevenZip.Compression.LZMA.Encoder();
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if (!encoder.SetAlgorithm(params.Algorithm))
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throw new Exception("Incorrect compression mode");
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if (!encoder.SetDictionarySize(params.DictionarySize))
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throw new Exception("Incorrect dictionary size");
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if (!encoder.SeNumFastBytes(params.Fb))
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throw new Exception("Incorrect -fb value");
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if (!encoder.SetMatchFinder(params.MatchFinder))
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throw new Exception("Incorrect -mf value");
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if (!encoder.SetLcLpPb(params.Lc, params.Lp, params.Pb))
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throw new Exception("Incorrect -lc or -lp or -pb value");
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encoder.SetEndMarkerMode(eos);
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encoder.WriteCoderProperties(outStream);
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long fileSize;
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if (eos)
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fileSize = -1;
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else
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fileSize = inFile.length();
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for (int i = 0; i < 8; i++)
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outStream.write((int)(fileSize >>> (8 * i)) & 0xFF);
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encoder.Code(inStream, outStream, -1, -1, null);
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}
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else
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{
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int propertiesSize = 5;
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byte[] properties = new byte[propertiesSize];
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if (inStream.read(properties, 0, propertiesSize) != propertiesSize)
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throw new Exception("input .lzma file is too short");
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SevenZip.Compression.LZMA.Decoder decoder = new SevenZip.Compression.LZMA.Decoder();
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if (!decoder.SetDecoderProperties(properties))
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throw new Exception("Incorrect stream properties");
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long outSize = 0;
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for (int i = 0; i < 8; i++)
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{
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int v = inStream.read();
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if (v < 0)
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throw new Exception("Can't read stream size");
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outSize |= ((long)v) << (8 * i);
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}
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if (!decoder.Code(inStream, outStream, outSize))
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throw new Exception("Error in data stream");
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}
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outStream.flush();
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outStream.close();
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inStream.close();
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}
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else
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throw new Exception("Incorrect command");
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return;
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}
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}
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