J2ME如何解压带密码的zip包，已经知道密码
J2ME如何解压带密码的zip包，已经知道密码。
我这里是要在手机里面打开 zip包。
[解决办法]
只知道解压没密码。不过有款J2ME软件可以解压带密码的zip。
BlueFTP可以
[解决办法]
超级短小精悍的ZIP解压缩类，只有280行Java代码，混淆并压缩后的class文件仅4K左右，特别适用于j2me开发。
解压缩算法来自网上那个著名的GZIP.java，只添加了解析ZIP文件格式的部分。
list()方法：
列出zip包中所有的文件及目录，列出的是包括路径的全名，比如文件"dir1/dir2/file.txt"，或目录"dir1/dir2/"，注意路径分隔符是正斜杠'/'，目录的最后一个字符一定是'/'。
get(String filename)方法：
从zip包中解压缩给定名字的文件，返回字节数组。
ZipMe(InputStream is)：
从一个输入流读取zip文件，可以是jar包中的文件，也可以是通过FileConnection获取的手机文件系统中的文件，或从网络上下载的zip包。
下面的例子代码访问jar包中的zip文件并逐一解压缩包中的所有文件：
InputStream is = "".getClass().getResourceAsStream("/res/test.zip");
ZipMe file = new ZipMe(is);
is.close();
Vector p = file.list();
for (int i = 0; i < p.size(); i++) {
String name = (String) p.get(i);
byte[] bb = file.get(name);
System.out.println("file: " + name + " / data_len: " + (bb != null ? bb.length : -1));
}
[解决办法]
- Java code
import java.io.*;import java.util.*;public class ZipMe { private static final int BTYPE_NONE = 0; private static final int BTYPE_DYNAMIC = 2; private static final int MAX_BITS = 16; private static final int MAX_CODE_LITERALS = 287; private static final int MAX_CODE_DISTANCES = 31; private static final int MAX_CODE_LENGTHS = 18; private static final int EOB_CODE = 256; private static final int LENGTH_EXTRA_BITS[] = { 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 99, 99 }; private static final int LENGTH_VALUES[] = { 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0 }; private static final int DISTANCE_EXTRA_BITS[] = { 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13 }; private static final int DISTANCE_VALUES[] = { 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577 }; private static final int DYNAMIC_LENGTH_ORDER[] = { 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 }; private int curIndex, curByte, curBit; public final byte[] inflate(byte data[], int startIdx, int size) { curIndex = startIdx; byte ret[] = new byte[size]; int idx, bfinal, btype; idx = bfinal = btype = curByte = curBit = 0; do { bfinal = readBits(data, 1); btype = readBits(data, 2); if (btype == BTYPE_NONE) { curBit = 0; // LEN. int len = readBits(data, 16); // NLEN. readBits(data, 16); System.arraycopy(data, curIndex, ret, idx, len); curIndex += len; idx += len; } else { int literalTree[], distanceTree[]; if (btype == BTYPE_DYNAMIC) { int hlit = readBits(data, 5) + 257; int hdist = readBits(data, 5) + 1; int hclen = readBits(data, 4) + 4; byte lengthBits[] = new byte[MAX_CODE_LENGTHS + 1]; for (int i = 0; i < hclen; i++) lengthBits[DYNAMIC_LENGTH_ORDER[i]] = (byte) readBits(data, 3); int lengthTree[] = huffmanTree(lengthBits, MAX_CODE_LENGTHS); literalTree = huffmanTree(codeLengths(data, lengthTree, hlit), hlit - 1); distanceTree = huffmanTree(codeLengths(data, lengthTree, hdist), hdist - 1); } else { byte literalBits[] = new byte[MAX_CODE_LITERALS + 1]; for (int i = 144; --i >= 0; literalBits[i] = 8); for (int i = 256; --i >= 144; literalBits[i] = 9); for (int i = 280; --i >= 256; literalBits[i] = 7); for (int i = 288; --i >= 280; literalBits[i] = 8); literalTree = huffmanTree(literalBits, MAX_CODE_LITERALS); byte distanceBits[] = new byte[MAX_CODE_DISTANCES + 1]; for (int i = distanceBits.length; --i >= 0; distanceBits[i] = 5); distanceTree = huffmanTree(distanceBits, MAX_CODE_DISTANCES); } int code = 0, leb = 0, deb = 0; while ((code = readCode(data, literalTree)) != EOB_CODE) { if (code > EOB_CODE) { code -= 257; int length = LENGTH_VALUES[code]; if ((leb = LENGTH_EXTRA_BITS[code]) > 0) length += readBits(data, leb); code = readCode(data, distanceTree); int distance = DISTANCE_VALUES[code]; if ((deb = DISTANCE_EXTRA_BITS[code]) > 0) distance += readBits(data, deb); int offset = idx - distance; while (distance < length) { System.arraycopy(ret, offset, ret, idx, distance); idx += distance; length -= distance; distance <<= 1; } System.arraycopy(ret, offset, ret, idx, length); idx += length; } else { ret[idx++] = (byte) code; } } } } while (bfinal == 0); return ret; } private final int readBits(byte bb[], int n) { int data = (curBit == 0 ? (curByte = (bb[curIndex++] & 0xFF)) : (curByte >> curBit)); for (int i = (8 - curBit); i < n; i += 8) { curByte = (bb[curIndex++] & 0xFF); data |= (curByte << i); } curBit = (curBit + n) & 7; return (data & ((1 << n) - 1)); } private final int readCode(byte bb[], int tree[]) { int node = tree[0]; while (node >= 0) { if (curBit == 0) curByte = (bb[curIndex++] & 0xFF); node = (((curByte & (1 << curBit)) == 0) ? tree[node >> 16] : tree[node & 0xFFFF]); curBit = (curBit + 1) & 7; } return (node & 0xFFFF); }
[解决办法]
- Java code
private final byte[] codeLengths(byte bb[], int lentree[], int count) { byte bits[] = new byte[count]; for (int i = 0, code = 0, last = 0; i < count;) { code = readCode(bb, lentree); if (code >= 16) { int repeat = 0; if (code == 16) { repeat = 3 + readBits(bb, 2); code = last; } else { if (code == 17) repeat = 3 + readBits(bb, 3); else repeat = 11 + readBits(bb, 7); code = 0; } while (repeat-- > 0) bits[i++] = (byte) code; } else { bits[i++] = (byte) code; } last = code; } return bits; } private final static int[] huffmanTree(byte bits[], int maxCode) { int bl_count[] = new int[MAX_BITS + 1]; for (int i = 0, n = bits.length; i < n; i++) bl_count[bits[i]]++; int code = 0; bl_count[0] = 0; int next_code[] = new int[MAX_BITS + 1]; for (int i = 1; i <= MAX_BITS; i++) next_code[i] = code = (code + bl_count[i - 1]) << 1; int tree[] = new int[(maxCode << 1) + MAX_BITS]; int treeInsert = 1; for (int i = 0; i <= maxCode; i++) { int len = bits[i]; if (len != 0) { code = next_code[len]++; int node = 0; for (int bit = len - 1; bit >= 0; bit--) { int value = code & (1 << bit); if (value == 0) { int left = tree[node] >> 16; if (left == 0) { tree[node] |= (treeInsert << 16); node = treeInsert++; } else node = left; } else { int right = tree[node] & 0xFFFF; if (right == 0) { tree[node] |= treeInsert; node = treeInsert++; } else node = right; } } tree[node] = 0x80000000 | i; } } return tree; } private byte[] data; private Hashtable htToc; public ZipMe(byte[] data) { reset(data); } public ZipMe(InputStream is) throws IOException { byte[] bb = inputStreamToBytes(is); reset(bb); } public final ZipMe reset(byte[] data) { this.data = data; htToc = null; return this; } public final Vector list() { Hashtable toc; if ((toc = htToc) == null) { toc = htToc = new Hashtable(); int offset, i; offset = i = 0; for (;;) { int n = read(data, offset, 4); if (n != 0x04034B50) break; // end of data section offset += 8; // header,pkware_ver,global_flag int method = read(data, offset, 2); offset += 10; // method,date,time,crc int size = read(data, offset, 4); offset += 4; // compressed_size int orisize = read(data, offset, 4); offset += 4; // original_size int filenamelen = read(data, offset, 2); offset += 2; int extlen = read(data, offset, 2); offset += 2; String filename = new String(data, offset, filenamelen); offset += filenamelen + extlen; toc.put(filename, new int[] { offset, size, orisize, method, i++ } ); offset += size; } } Vector ret = new Vector(toc.size()); for (Enumeration e = toc.keys(); e.hasMoreElements();) { String filename = (String) e.nextElement(); ret.add(filename); } return ret; } public final byte[] get(String name) { if (htToc == null) list(); int[] info = (int[]) htToc.get(name); if (info == null) return null; if (info[1] == 0) return new byte[0]; if (info[3] == 0) { // store byte[] ret = new byte[info[2]]; System.arraycopy(data, info[0], ret, 0, info[2]); return ret; } else if (info[3] == 8) { // deflate byte[] ret = inflate(data, info[0], info[2]); return ret; } return null; } private static final int read(byte[] data, int offset, int len) { int ret = 0; for (int i = offset, j = 0, n = offset + len; i < n; i++, j += 8) { ret |= ((data[i] & 0xff) << j); } return ret; } private static final byte[] inputStreamToBytes(InputStream is) throws IOException { ByteArrayOutputStream bos = new ByteArrayOutputStream(); byte[] bb = new byte[10000]; for (int len = is.read(bb); len > 0; len = is.read(bb)) { bos.write(bb, 0, len); } return bos.toByteArray(); }
[解决办法]
J2ME的zip加密、解密要自己实现，给你份ZIP格式资料
- Java code
总览 .zip 文件格式：[文件标头 1][文件数据 1][数据描述符记录 1]...[文件标头 n][文件数据 n][数据描述符记录 n][归档解密标头][归档额外数据记录][中央目录结构][中央目录记录的 Zip64 结尾][中央目录定位器的 Zip64 结尾][中央目录记录的结尾]