The UTF-8 {@link java.nio.charset.Charset charset} is used to - * decode the entry names. - * - * @param in the actual input stream - */ - public ZipInputStream(InputStream in) { -// this(in, "UTF-8"); - super(new PushbackInputStream(in, 512), new Inflater(true), 512); - //usesDefaultInflater = true; - if(in == null) { - throw new NullPointerException("in is null"); - } - } - - /** - * Creates a new ZIP input stream. - * - * @param in the actual input stream - * - * @param charset - * The {@linkplain java.nio.charset.Charset charset} to be - * used to decode the ZIP entry name (ignored if the - * language - * encoding bit of the ZIP entry's general purpose bit - * flag is set). - * - * @since 1.7 - * - public ZipInputStream(InputStream in, Charset charset) { - super(new PushbackInputStream(in, 512), new Inflater(true), 512); - usesDefaultInflater = true; - if(in == null) { - throw new NullPointerException("in is null"); - } - if (charset == null) - throw new NullPointerException("charset is null"); - this.zc = ZipCoder.get(charset); - } - */ - - /** - * Reads the next ZIP file entry and positions the stream at the - * beginning of the entry data. - * @return the next ZIP file entry, or null if there are no more entries - * @exception ZipException if a ZIP file error has occurred - * @exception IOException if an I/O error has occurred - */ - public ZipEntry getNextEntry() throws IOException { - ensureOpen(); - if (entry != null) { - closeEntry(); - } - crc.reset(); - inf.reset(); - if ((entry = readLOC()) == null) { - return null; - } - if (entry.getMethod() == STORED) { - remaining = entry.getSize(); - } - entryEOF = false; - return entry; - } - - /** - * Closes the current ZIP entry and positions the stream for reading the - * next entry. - * @exception ZipException if a ZIP file error has occurred - * @exception IOException if an I/O error has occurred - */ - public void closeEntry() throws IOException { - ensureOpen(); - while (read(tmpbuf, 0, tmpbuf.length) != -1) ; - entryEOF = true; - } - - /** - * Returns 0 after EOF has reached for the current entry data, - * otherwise always return 1. - *
- * Programs should not count on this method to return the actual number
- * of bytes that could be read without blocking.
- *
- * @return 1 before EOF and 0 after EOF has reached for current entry.
- * @exception IOException if an I/O error occurs.
- *
- */
- public int available() throws IOException {
- ensureOpen();
- if (entryEOF) {
- return 0;
- } else {
- return 1;
- }
- }
-
- /**
- * Reads from the current ZIP entry into an array of bytes.
- * If len is not zero, the method
- * blocks until some input is available; otherwise, no
- * bytes are read and 0 is returned.
- * @param b the buffer into which the data is read
- * @param off the start offset in the destination array b
- * @param len the maximum number of bytes read
- * @return the actual number of bytes read, or -1 if the end of the
- * entry is reached
- * @exception NullPointerException if b is null.
- * @exception IndexOutOfBoundsException if off is negative,
- * len is negative, or len is greater than
- * b.length - off
- * @exception ZipException if a ZIP file error has occurred
- * @exception IOException if an I/O error has occurred
- */
- public int read(byte[] b, int off, int len) throws IOException {
- ensureOpen();
- if (off < 0 || len < 0 || off > b.length - len) {
- throw new IndexOutOfBoundsException();
- } else if (len == 0) {
- return 0;
- }
-
- if (entry == null) {
- return -1;
- }
- switch (entry.getMethod()) {
- case DEFLATED:
- len = super.read(b, off, len);
- if (len == -1) {
- readEnd(entry);
- entryEOF = true;
- entry = null;
- } else {
- crc.update(b, off, len);
- }
- return len;
- case STORED:
- if (remaining <= 0) {
- entryEOF = true;
- entry = null;
- return -1;
- }
- if (len > remaining) {
- len = (int)remaining;
- }
- len = in.read(b, off, len);
- if (len == -1) {
- throw new ZipException("unexpected EOF");
- }
- crc.update(b, off, len);
- remaining -= len;
- if (remaining == 0 && entry.getCrc() != crc.getValue()) {
- throw new ZipException(
- "invalid entry CRC (expected 0x" + Long.toHexString(entry.getCrc()) +
- " but got 0x" + Long.toHexString(crc.getValue()) + ")");
- }
- return len;
- default:
- throw new ZipException("invalid compression method");
- }
- }
-
- /**
- * Skips specified number of bytes in the current ZIP entry.
- * @param n the number of bytes to skip
- * @return the actual number of bytes skipped
- * @exception ZipException if a ZIP file error has occurred
- * @exception IOException if an I/O error has occurred
- * @exception IllegalArgumentException if n < 0
- */
- public long skip(long n) throws IOException {
- if (n < 0) {
- throw new IllegalArgumentException("negative skip length");
- }
- ensureOpen();
- int max = (int)Math.min(n, Integer.MAX_VALUE);
- int total = 0;
- while (total < max) {
- int len = max - total;
- if (len > tmpbuf.length) {
- len = tmpbuf.length;
- }
- len = read(tmpbuf, 0, len);
- if (len == -1) {
- entryEOF = true;
- break;
- }
- total += len;
- }
- return total;
- }
-
- /**
- * Closes this input stream and releases any system resources associated
- * with the stream.
- * @exception IOException if an I/O error has occurred
- */
- public void close() throws IOException {
- if (!closed) {
- super.close();
- closed = true;
- }
- }
-
- private byte[] b = new byte[256];
-
- /*
- * Reads local file (LOC) header for next entry.
- */
- private ZipEntry readLOC() throws IOException {
- try {
- readFully(tmpbuf, 0, LOCHDR);
- } catch (EOFException e) {
- return null;
- }
- if (get32(tmpbuf, 0) != LOCSIG) {
- return null;
- }
- // get flag first, we need check EFS.
- flag = get16(tmpbuf, LOCFLG);
- // get the entry name and create the ZipEntry first
- int len = get16(tmpbuf, LOCNAM);
- int blen = b.length;
- if (len > blen) {
- do
- blen = blen * 2;
- while (len > blen);
- b = new byte[blen];
- }
- readFully(b, 0, len);
- // Force to use UTF-8 if the EFS bit is ON, even the cs is NOT UTF-8
- ZipEntry e = createZipEntry(((flag & EFS) != 0)
- ? toStringUTF8(b, len)
- : toString(b, len));
- // now get the remaining fields for the entry
- if ((flag & 1) == 1) {
- throw new ZipException("encrypted ZIP entry not supported");
- }
- e.setMethod(get16(tmpbuf, LOCHOW));
- e.setTime(get32(tmpbuf, LOCTIM));
- if ((flag & 8) == 8) {
- /* "Data Descriptor" present */
- if (e.getMethod() != DEFLATED) {
- throw new ZipException(
- "only DEFLATED entries can have EXT descriptor");
- }
- } else {
- e.setCrc(get32(tmpbuf, LOCCRC));
- e.setCompressedSize(get32(tmpbuf, LOCSIZ));
- e.setSize(get32(tmpbuf, LOCLEN));
- }
- len = get16(tmpbuf, LOCEXT);
- if (len > 0) {
- byte[] bb = new byte[len];
- readFully(bb, 0, len);
- e.setExtra(bb);
- // extra fields are in "HeaderID(2)DataSize(2)Data... format
- if (e.getCompressedSize() == ZIP64_MAGICVAL || e.getCompressedSize() == ZIP64_MAGICVAL) {
- int off = 0;
- while (off + 4 < len) {
- int sz = get16(bb, off + 2);
- if (get16(bb, off) == ZIP64_EXTID) {
- off += 4;
- // LOC extra zip64 entry MUST include BOTH original and
- // compressed file size fields
- if (sz < 16 || (off + sz) > len ) {
- // Invalid zip64 extra fields, simply skip. Even it's
- // rare, it's possible the entry size happens to be
- // the magic value and it "accidnetly" has some bytes
- // in extra match the id.
- return e;
- }
- e.setSize(get64(bb, off));
- e.setCompressedSize(get64(bb, off + 8));
- break;
- }
- off += (sz + 4);
- }
- }
- }
- return e;
- }
-
- /**
- * Creates a new ZipEntry object for the specified
- * entry name.
- *
- * @param name the ZIP file entry name
- * @return the ZipEntry just created
- */
- protected ZipEntry createZipEntry(String name) {
- return new ZipEntry(name);
- }
-
- /*
- * Reads end of deflated entry as well as EXT descriptor if present.
- */
- private void readEnd(ZipEntry e) throws IOException {
- int n = inf.getRemaining();
- if (n > 0) {
- ((PushbackInputStream)in).unread(buf, len - n, n);
- }
- if ((flag & 8) == 8) {
- /* "Data Descriptor" present */
- if (inf.getBytesWritten() > ZIP64_MAGICVAL ||
- inf.getBytesRead() > ZIP64_MAGICVAL) {
- // ZIP64 format
- readFully(tmpbuf, 0, ZIP64_EXTHDR);
- long sig = get32(tmpbuf, 0);
- if (sig != EXTSIG) { // no EXTSIG present
- e.setCrc(sig);
- e.setCompressedSize(get64(tmpbuf, ZIP64_EXTSIZ - ZIP64_EXTCRC));
- e.setSize(get64(tmpbuf, ZIP64_EXTLEN - ZIP64_EXTCRC));
- ((PushbackInputStream)in).unread(
- tmpbuf, ZIP64_EXTHDR - ZIP64_EXTCRC - 1, ZIP64_EXTCRC);
- } else {
- e.setCrc(get32(tmpbuf, ZIP64_EXTCRC));
- e.setCompressedSize(get64(tmpbuf, ZIP64_EXTSIZ));
- e.setSize(get64(tmpbuf, ZIP64_EXTLEN));
- }
- } else {
- readFully(tmpbuf, 0, EXTHDR);
- long sig = get32(tmpbuf, 0);
- if (sig != EXTSIG) { // no EXTSIG present
- e.setCrc(sig);
- e.setCompressedSize(get32(tmpbuf, EXTSIZ - EXTCRC));
- e.setSize(get32(tmpbuf, EXTLEN - EXTCRC));
- ((PushbackInputStream)in).unread(
- tmpbuf, EXTHDR - EXTCRC - 1, EXTCRC);
- } else {
- e.setCrc(get32(tmpbuf, EXTCRC));
- e.setCompressedSize(get32(tmpbuf, EXTSIZ));
- e.setSize(get32(tmpbuf, EXTLEN));
- }
- }
- }
- if (e.getSize() != inf.getBytesWritten()) {
- throw new ZipException(
- "invalid entry size (expected " + e.getSize() +
- " but got " + inf.getBytesWritten() + " bytes)");
- }
- if (e.getCompressedSize() != inf.getBytesRead()) {
- throw new ZipException(
- "invalid entry compressed size (expected " + e.getCompressedSize() +
- " but got " + inf.getBytesRead() + " bytes)");
- }
- if (e.getCrc() != crc.getValue()) {
- throw new ZipException(
- "invalid entry CRC (expected 0x" + Long.toHexString(e.getCrc()) +
- " but got 0x" + Long.toHexString(crc.getValue()) + ")");
- }
- }
-
- /*
- * Reads bytes, blocking until all bytes are read.
- */
- private void readFully(byte[] b, int off, int len) throws IOException {
- while (len > 0) {
- int n = in.read(b, off, len);
- if (n == -1) {
- throw new EOFException();
- }
- off += n;
- len -= n;
- }
- }
-
- /*
- * Fetches unsigned 16-bit value from byte array at specified offset.
- * The bytes are assumed to be in Intel (little-endian) byte order.
- */
- private static final int get16(byte b[], int off) {
- return (b[off] & 0xff) | ((b[off+1] & 0xff) << 8);
- }
-
- /*
- * Fetches unsigned 32-bit value from byte array at specified offset.
- * The bytes are assumed to be in Intel (little-endian) byte order.
- */
- private static final long get32(byte b[], int off) {
- return (get16(b, off) | ((long)get16(b, off+2) << 16)) & 0xffffffffL;
- }
-
- /*
- * Fetches signed 64-bit value from byte array at specified offset.
- * The bytes are assumed to be in Intel (little-endian) byte order.
- */
- private static final long get64(byte b[], int off) {
- return get32(b, off) | (get32(b, off+4) << 32);
- }
-
- private static String toStringUTF8(byte[] arr, int len) {
- return new String(arr, 0, len);
- }
-
- private static String toString(byte[] b, int len) {
- return new String(b, 0, len);
- }
-}