Java实现的带密码压缩与解压zip文件源码

/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package ZipFramework; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.nio.MappedByteBuffer; import java.nio.channels.FileChannel; import java.util.Random; import java.util.logging.Level; import java.util.logging.Logger; import java.util.zip.CRC32; /** * * @author Neill Harper */ public class FileData extends ZIPObject { private static final int DECRYPT_HEADER_SIZE = 12; private static final String INIT = "未开始"; private static final String EXTRACT = "解压中"; private static final String EXTRACTCOMPLETE = "解压完成"; private static final String VALIDATE = "验证密码中"; private File tempFile; private FileEntry parent; private CRC32 crc32; private int[] keys = new int[3]; private int complete = 0; private String state = INIT; private int[] crcNums = { 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d }; public FileData(FileEntry Parent) throws IOException { parent = Parent; tempFile = File.createTempFile("zip", null); this.fillTempFile(); } public String getState(){ return state; } public String getProcess(){ if(state.equals(EXTRACT)) return complete + "/" + parent.compressedSize + " " + complete*100/parent.compressedSize + "%"; else return ""; } protected byte[] GetOutput() { FileInputStream output = null; byte[] outBytes = new byte[(int) tempFile.length()]; try { output = new FileInputStream(tempFile); output.read(outBytes, 0, outBytes.length); return outBytes; } catch (FileNotFoundException ex) { Logger.getLogger(FileData.class.getName()).log(Level.SEVERE, null, ex); } catch (IOException ioE) { Logger.getLogger(FileData.class.getName()).log(Level.SEVERE, null, ioE); } finally { try { output.close(); } catch (IOException ex) { Logger.getLogger(FileData.class.getName()).log(Level.SEVERE, null, ex); } } return outBytes; } private void fillTempFile() throws FileNotFoundException, IOException { if (this.parent.getFilePath().exists()) { switch (parent.getLfh().getMethod().getMethodValue()) { case Method.Stored: storedCompression(); break; case Method.Deflated: deflateCompression(); break; default: throw new UnsupportedOperationException("Not supported yet."); } if (this.parent.getPassword() != null) { EncryptFileData(); } this.parent.getLfh().setCompressedSize((int) tempFile.length()); } } /** * 解密数据，无密码直接返回true * @param in * @return boolean， 返回false表示密码错误 * @throws UnsupportedEncodingException * @throws IOException */ public boolean DecryptFileData(MyZipInputStream in) throws UnsupportedEncodingException, IOException { FileOutputStream output = null; state = FileData.EXTRACT; complete = 0; //无密码 if(this.parent.getPassword() == null){ output = new FileOutputStream(tempFile); byte[] inBytes = new byte[1024]; int numberRead = 0; int len = this.parent.compressedSize; while (complete<len && (numberRead = in.read(inBytes, 0, 1024)) != -1) { output.write(inBytes); complete += numberRead; } state = FileData.EXTRACTCOMPLETE; return true; }else{ //有密码 try { output = new FileOutputStream(tempFile); byte[] encBuf = new byte[DECRYPT_HEADER_SIZE]; in.read(encBuf, 0, encBuf.length); initKeys(this.parent.getPassword()); for (int i = 0; i < DECRYPT_HEADER_SIZE; i++) { updateKeys((byte) (encBuf[i] ^ DecryptByte())); complete++; } byte[] inBytes = new byte[1]; int numberRead = 0; int len = this.parent.compressedSize; while (complete<len && (numberRead = in.read(inBytes, 0, 1)) != -1) { inBytes[0] = (byte)((inBytes[0] ^ DecryptByte()) & 0xff); updateKeys(inBytes[0]); output.write(inBytes[0]); complete += numberRead; } } finally { output.close(); } state = FileData.EXTRACTCOMPLETE; return checkPassword(); } } private boolean checkPassword() throws FileNotFoundException, IOException { this.state = FileData.VALIDATE; boolean result = false; switch (parent.getLfh().getMethod().getMethodValue()) { case Method.Stored: result = checkStoredCompression(); break; default: throw new UnsupportedOperationException("Not supported yet."); } return result; } private void initKeys(String password) throws UnsupportedEncodingException{ keys[0] = 305419896; keys[1] = 591751049; keys[2] = 878082192;