1.1 --- a/emul/mini/src/main/java/org/apidesign/bck2brwsr/emul/zip/ZipInputStream.java Mon Feb 25 19:00:08 2013 +0100
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,468 +0,0 @@
1.4 -/*
1.5 - * Copyright (c) 1996, 2009, Oracle and/or its affiliates. All rights reserved.
1.6 - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 - *
1.8 - * This code is free software; you can redistribute it and/or modify it
1.9 - * under the terms of the GNU General Public License version 2 only, as
1.10 - * published by the Free Software Foundation. Oracle designates this
1.11 - * particular file as subject to the "Classpath" exception as provided
1.12 - * by Oracle in the LICENSE file that accompanied this code.
1.13 - *
1.14 - * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 - * version 2 for more details (a copy is included in the LICENSE file that
1.18 - * accompanied this code).
1.19 - *
1.20 - * You should have received a copy of the GNU General Public License version
1.21 - * 2 along with this work; if not, write to the Free Software Foundation,
1.22 - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 - *
1.24 - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 - * or visit www.oracle.com if you need additional information or have any
1.26 - * questions.
1.27 - */
1.28 -
1.29 -package org.apidesign.bck2brwsr.emul.zip;
1.30 -
1.31 -import java.util.zip.*;
1.32 -import java.io.InputStream;
1.33 -import java.io.IOException;
1.34 -import java.io.EOFException;
1.35 -import java.io.PushbackInputStream;
1.36 -import static org.apidesign.bck2brwsr.emul.zip.ZipConstants64.*;
1.37 -import static java.util.zip.ZipInputStream.*;
1.38 -
1.39 -/**
1.40 - * This class implements an input stream filter for reading files in the
1.41 - * ZIP file format. Includes support for both compressed and uncompressed
1.42 - * entries.
1.43 - *
1.44 - * @author David Connelly
1.45 - */
1.46 -public
1.47 -class ZipInputStream extends InflaterInputStream {
1.48 - private ZipEntry entry;
1.49 - private int flag;
1.50 - private CRC32 crc = new CRC32();
1.51 - private long remaining;
1.52 - private byte[] tmpbuf = new byte[512];
1.53 -
1.54 - private static final int STORED = ZipEntry.STORED;
1.55 - private static final int DEFLATED = ZipEntry.DEFLATED;
1.56 -
1.57 - private boolean closed = false;
1.58 - // this flag is set to true after EOF has reached for
1.59 - // one entry
1.60 - private boolean entryEOF = false;
1.61 -
1.62 - /**
1.63 - * Check to make sure that this stream has not been closed
1.64 - */
1.65 - private void ensureOpen() throws IOException {
1.66 - if (closed) {
1.67 - throw new IOException("Stream closed");
1.68 - }
1.69 - }
1.70 -
1.71 - /**
1.72 - * Creates a new ZIP input stream.
1.73 - *
1.74 - * <p>The UTF-8 {@link java.nio.charset.Charset charset} is used to
1.75 - * decode the entry names.
1.76 - *
1.77 - * @param in the actual input stream
1.78 - */
1.79 - public ZipInputStream(InputStream in) {
1.80 -// this(in, "UTF-8");
1.81 - super(new PushbackInputStream(in, 512), new Inflater(true), 512);
1.82 - //usesDefaultInflater = true;
1.83 - if(in == null) {
1.84 - throw new NullPointerException("in is null");
1.85 - }
1.86 - }
1.87 -
1.88 - /**
1.89 - * Creates a new ZIP input stream.
1.90 - *
1.91 - * @param in the actual input stream
1.92 - *
1.93 - * @param charset
1.94 - * The {@linkplain java.nio.charset.Charset charset} to be
1.95 - * used to decode the ZIP entry name (ignored if the
1.96 - * <a href="package-summary.html#lang_encoding"> language
1.97 - * encoding bit</a> of the ZIP entry's general purpose bit
1.98 - * flag is set).
1.99 - *
1.100 - * @since 1.7
1.101 - *
1.102 - public ZipInputStream(InputStream in, Charset charset) {
1.103 - super(new PushbackInputStream(in, 512), new Inflater(true), 512);
1.104 - usesDefaultInflater = true;
1.105 - if(in == null) {
1.106 - throw new NullPointerException("in is null");
1.107 - }
1.108 - if (charset == null)
1.109 - throw new NullPointerException("charset is null");
1.110 - this.zc = ZipCoder.get(charset);
1.111 - }
1.112 - */
1.113 -
1.114 - /**
1.115 - * Reads the next ZIP file entry and positions the stream at the
1.116 - * beginning of the entry data.
1.117 - * @return the next ZIP file entry, or null if there are no more entries
1.118 - * @exception ZipException if a ZIP file error has occurred
1.119 - * @exception IOException if an I/O error has occurred
1.120 - */
1.121 - public ZipEntry getNextEntry() throws IOException {
1.122 - ensureOpen();
1.123 - if (entry != null) {
1.124 - closeEntry();
1.125 - }
1.126 - crc.reset();
1.127 - inf.reset();
1.128 - if ((entry = readLOC()) == null) {
1.129 - return null;
1.130 - }
1.131 - if (entry.getMethod() == STORED) {
1.132 - remaining = entry.getSize();
1.133 - }
1.134 - entryEOF = false;
1.135 - return entry;
1.136 - }
1.137 -
1.138 - /**
1.139 - * Closes the current ZIP entry and positions the stream for reading the
1.140 - * next entry.
1.141 - * @exception ZipException if a ZIP file error has occurred
1.142 - * @exception IOException if an I/O error has occurred
1.143 - */
1.144 - public void closeEntry() throws IOException {
1.145 - ensureOpen();
1.146 - while (read(tmpbuf, 0, tmpbuf.length) != -1) ;
1.147 - entryEOF = true;
1.148 - }
1.149 -
1.150 - /**
1.151 - * Returns 0 after EOF has reached for the current entry data,
1.152 - * otherwise always return 1.
1.153 - * <p>
1.154 - * Programs should not count on this method to return the actual number
1.155 - * of bytes that could be read without blocking.
1.156 - *
1.157 - * @return 1 before EOF and 0 after EOF has reached for current entry.
1.158 - * @exception IOException if an I/O error occurs.
1.159 - *
1.160 - */
1.161 - public int available() throws IOException {
1.162 - ensureOpen();
1.163 - if (entryEOF) {
1.164 - return 0;
1.165 - } else {
1.166 - return 1;
1.167 - }
1.168 - }
1.169 -
1.170 - /**
1.171 - * Reads from the current ZIP entry into an array of bytes.
1.172 - * If <code>len</code> is not zero, the method
1.173 - * blocks until some input is available; otherwise, no
1.174 - * bytes are read and <code>0</code> is returned.
1.175 - * @param b the buffer into which the data is read
1.176 - * @param off the start offset in the destination array <code>b</code>
1.177 - * @param len the maximum number of bytes read
1.178 - * @return the actual number of bytes read, or -1 if the end of the
1.179 - * entry is reached
1.180 - * @exception NullPointerException if <code>b</code> is <code>null</code>.
1.181 - * @exception IndexOutOfBoundsException if <code>off</code> is negative,
1.182 - * <code>len</code> is negative, or <code>len</code> is greater than
1.183 - * <code>b.length - off</code>
1.184 - * @exception ZipException if a ZIP file error has occurred
1.185 - * @exception IOException if an I/O error has occurred
1.186 - */
1.187 - public int read(byte[] b, int off, int len) throws IOException {
1.188 - ensureOpen();
1.189 - if (off < 0 || len < 0 || off > b.length - len) {
1.190 - throw new IndexOutOfBoundsException();
1.191 - } else if (len == 0) {
1.192 - return 0;
1.193 - }
1.194 -
1.195 - if (entry == null) {
1.196 - return -1;
1.197 - }
1.198 - switch (entry.getMethod()) {
1.199 - case DEFLATED:
1.200 - len = super.read(b, off, len);
1.201 - if (len == -1) {
1.202 - readEnd(entry);
1.203 - entryEOF = true;
1.204 - entry = null;
1.205 - } else {
1.206 - crc.update(b, off, len);
1.207 - }
1.208 - return len;
1.209 - case STORED:
1.210 - if (remaining <= 0) {
1.211 - entryEOF = true;
1.212 - entry = null;
1.213 - return -1;
1.214 - }
1.215 - if (len > remaining) {
1.216 - len = (int)remaining;
1.217 - }
1.218 - len = in.read(b, off, len);
1.219 - if (len == -1) {
1.220 - throw new ZipException("unexpected EOF");
1.221 - }
1.222 - crc.update(b, off, len);
1.223 - remaining -= len;
1.224 - if (remaining == 0 && entry.getCrc() != crc.getValue()) {
1.225 - throw new ZipException(
1.226 - "invalid entry CRC (expected 0x" + Long.toHexString(entry.getCrc()) +
1.227 - " but got 0x" + Long.toHexString(crc.getValue()) + ")");
1.228 - }
1.229 - return len;
1.230 - default:
1.231 - throw new ZipException("invalid compression method");
1.232 - }
1.233 - }
1.234 -
1.235 - /**
1.236 - * Skips specified number of bytes in the current ZIP entry.
1.237 - * @param n the number of bytes to skip
1.238 - * @return the actual number of bytes skipped
1.239 - * @exception ZipException if a ZIP file error has occurred
1.240 - * @exception IOException if an I/O error has occurred
1.241 - * @exception IllegalArgumentException if n < 0
1.242 - */
1.243 - public long skip(long n) throws IOException {
1.244 - if (n < 0) {
1.245 - throw new IllegalArgumentException("negative skip length");
1.246 - }
1.247 - ensureOpen();
1.248 - int max = (int)Math.min(n, Integer.MAX_VALUE);
1.249 - int total = 0;
1.250 - while (total < max) {
1.251 - int len = max - total;
1.252 - if (len > tmpbuf.length) {
1.253 - len = tmpbuf.length;
1.254 - }
1.255 - len = read(tmpbuf, 0, len);
1.256 - if (len == -1) {
1.257 - entryEOF = true;
1.258 - break;
1.259 - }
1.260 - total += len;
1.261 - }
1.262 - return total;
1.263 - }
1.264 -
1.265 - /**
1.266 - * Closes this input stream and releases any system resources associated
1.267 - * with the stream.
1.268 - * @exception IOException if an I/O error has occurred
1.269 - */
1.270 - public void close() throws IOException {
1.271 - if (!closed) {
1.272 - super.close();
1.273 - closed = true;
1.274 - }
1.275 - }
1.276 -
1.277 - private byte[] b = new byte[256];
1.278 -
1.279 - /*
1.280 - * Reads local file (LOC) header for next entry.
1.281 - */
1.282 - private ZipEntry readLOC() throws IOException {
1.283 - try {
1.284 - readFully(tmpbuf, 0, LOCHDR);
1.285 - } catch (EOFException e) {
1.286 - return null;
1.287 - }
1.288 - if (get32(tmpbuf, 0) != LOCSIG) {
1.289 - return null;
1.290 - }
1.291 - // get flag first, we need check EFS.
1.292 - flag = get16(tmpbuf, LOCFLG);
1.293 - // get the entry name and create the ZipEntry first
1.294 - int len = get16(tmpbuf, LOCNAM);
1.295 - int blen = b.length;
1.296 - if (len > blen) {
1.297 - do
1.298 - blen = blen * 2;
1.299 - while (len > blen);
1.300 - b = new byte[blen];
1.301 - }
1.302 - readFully(b, 0, len);
1.303 - // Force to use UTF-8 if the EFS bit is ON, even the cs is NOT UTF-8
1.304 - ZipEntry e = createZipEntry(((flag & EFS) != 0)
1.305 - ? toStringUTF8(b, len)
1.306 - : toString(b, len));
1.307 - // now get the remaining fields for the entry
1.308 - if ((flag & 1) == 1) {
1.309 - throw new ZipException("encrypted ZIP entry not supported");
1.310 - }
1.311 - e.setMethod(get16(tmpbuf, LOCHOW));
1.312 - e.setTime(get32(tmpbuf, LOCTIM));
1.313 - if ((flag & 8) == 8) {
1.314 - /* "Data Descriptor" present */
1.315 - if (e.getMethod() != DEFLATED) {
1.316 - throw new ZipException(
1.317 - "only DEFLATED entries can have EXT descriptor");
1.318 - }
1.319 - } else {
1.320 - e.setCrc(get32(tmpbuf, LOCCRC));
1.321 - e.setCompressedSize(get32(tmpbuf, LOCSIZ));
1.322 - e.setSize(get32(tmpbuf, LOCLEN));
1.323 - }
1.324 - len = get16(tmpbuf, LOCEXT);
1.325 - if (len > 0) {
1.326 - byte[] bb = new byte[len];
1.327 - readFully(bb, 0, len);
1.328 - e.setExtra(bb);
1.329 - // extra fields are in "HeaderID(2)DataSize(2)Data... format
1.330 - if (e.getCompressedSize() == ZIP64_MAGICVAL || e.getCompressedSize() == ZIP64_MAGICVAL) {
1.331 - int off = 0;
1.332 - while (off + 4 < len) {
1.333 - int sz = get16(bb, off + 2);
1.334 - if (get16(bb, off) == ZIP64_EXTID) {
1.335 - off += 4;
1.336 - // LOC extra zip64 entry MUST include BOTH original and
1.337 - // compressed file size fields
1.338 - if (sz < 16 || (off + sz) > len ) {
1.339 - // Invalid zip64 extra fields, simply skip. Even it's
1.340 - // rare, it's possible the entry size happens to be
1.341 - // the magic value and it "accidnetly" has some bytes
1.342 - // in extra match the id.
1.343 - return e;
1.344 - }
1.345 - e.setSize(get64(bb, off));
1.346 - e.setCompressedSize(get64(bb, off + 8));
1.347 - break;
1.348 - }
1.349 - off += (sz + 4);
1.350 - }
1.351 - }
1.352 - }
1.353 - return e;
1.354 - }
1.355 -
1.356 - /**
1.357 - * Creates a new <code>ZipEntry</code> object for the specified
1.358 - * entry name.
1.359 - *
1.360 - * @param name the ZIP file entry name
1.361 - * @return the ZipEntry just created
1.362 - */
1.363 - protected ZipEntry createZipEntry(String name) {
1.364 - return new ZipEntry(name);
1.365 - }
1.366 -
1.367 - /*
1.368 - * Reads end of deflated entry as well as EXT descriptor if present.
1.369 - */
1.370 - private void readEnd(ZipEntry e) throws IOException {
1.371 - int n = inf.getRemaining();
1.372 - if (n > 0) {
1.373 - ((PushbackInputStream)in).unread(buf, len - n, n);
1.374 - }
1.375 - if ((flag & 8) == 8) {
1.376 - /* "Data Descriptor" present */
1.377 - if (inf.getBytesWritten() > ZIP64_MAGICVAL ||
1.378 - inf.getBytesRead() > ZIP64_MAGICVAL) {
1.379 - // ZIP64 format
1.380 - readFully(tmpbuf, 0, ZIP64_EXTHDR);
1.381 - long sig = get32(tmpbuf, 0);
1.382 - if (sig != EXTSIG) { // no EXTSIG present
1.383 - e.setCrc(sig);
1.384 - e.setCompressedSize(get64(tmpbuf, ZIP64_EXTSIZ - ZIP64_EXTCRC));
1.385 - e.setSize(get64(tmpbuf, ZIP64_EXTLEN - ZIP64_EXTCRC));
1.386 - ((PushbackInputStream)in).unread(
1.387 - tmpbuf, ZIP64_EXTHDR - ZIP64_EXTCRC - 1, ZIP64_EXTCRC);
1.388 - } else {
1.389 - e.setCrc(get32(tmpbuf, ZIP64_EXTCRC));
1.390 - e.setCompressedSize(get64(tmpbuf, ZIP64_EXTSIZ));
1.391 - e.setSize(get64(tmpbuf, ZIP64_EXTLEN));
1.392 - }
1.393 - } else {
1.394 - readFully(tmpbuf, 0, EXTHDR);
1.395 - long sig = get32(tmpbuf, 0);
1.396 - if (sig != EXTSIG) { // no EXTSIG present
1.397 - e.setCrc(sig);
1.398 - e.setCompressedSize(get32(tmpbuf, EXTSIZ - EXTCRC));
1.399 - e.setSize(get32(tmpbuf, EXTLEN - EXTCRC));
1.400 - ((PushbackInputStream)in).unread(
1.401 - tmpbuf, EXTHDR - EXTCRC - 1, EXTCRC);
1.402 - } else {
1.403 - e.setCrc(get32(tmpbuf, EXTCRC));
1.404 - e.setCompressedSize(get32(tmpbuf, EXTSIZ));
1.405 - e.setSize(get32(tmpbuf, EXTLEN));
1.406 - }
1.407 - }
1.408 - }
1.409 - if (e.getSize() != inf.getBytesWritten()) {
1.410 - throw new ZipException(
1.411 - "invalid entry size (expected " + e.getSize() +
1.412 - " but got " + inf.getBytesWritten() + " bytes)");
1.413 - }
1.414 - if (e.getCompressedSize() != inf.getBytesRead()) {
1.415 - throw new ZipException(
1.416 - "invalid entry compressed size (expected " + e.getCompressedSize() +
1.417 - " but got " + inf.getBytesRead() + " bytes)");
1.418 - }
1.419 - if (e.getCrc() != crc.getValue()) {
1.420 - throw new ZipException(
1.421 - "invalid entry CRC (expected 0x" + Long.toHexString(e.getCrc()) +
1.422 - " but got 0x" + Long.toHexString(crc.getValue()) + ")");
1.423 - }
1.424 - }
1.425 -
1.426 - /*
1.427 - * Reads bytes, blocking until all bytes are read.
1.428 - */
1.429 - private void readFully(byte[] b, int off, int len) throws IOException {
1.430 - while (len > 0) {
1.431 - int n = in.read(b, off, len);
1.432 - if (n == -1) {
1.433 - throw new EOFException();
1.434 - }
1.435 - off += n;
1.436 - len -= n;
1.437 - }
1.438 - }
1.439 -
1.440 - /*
1.441 - * Fetches unsigned 16-bit value from byte array at specified offset.
1.442 - * The bytes are assumed to be in Intel (little-endian) byte order.
1.443 - */
1.444 - private static final int get16(byte b[], int off) {
1.445 - return (b[off] & 0xff) | ((b[off+1] & 0xff) << 8);
1.446 - }
1.447 -
1.448 - /*
1.449 - * Fetches unsigned 32-bit value from byte array at specified offset.
1.450 - * The bytes are assumed to be in Intel (little-endian) byte order.
1.451 - */
1.452 - private static final long get32(byte b[], int off) {
1.453 - return (get16(b, off) | ((long)get16(b, off+2) << 16)) & 0xffffffffL;
1.454 - }
1.455 -
1.456 - /*
1.457 - * Fetches signed 64-bit value from byte array at specified offset.
1.458 - * The bytes are assumed to be in Intel (little-endian) byte order.
1.459 - */
1.460 - private static final long get64(byte b[], int off) {
1.461 - return get32(b, off) | (get32(b, off+4) << 32);
1.462 - }
1.463 -
1.464 - private static String toStringUTF8(byte[] arr, int len) {
1.465 - return new String(arr, 0, len);
1.466 - }
1.467 -
1.468 - private static String toString(byte[] b, int len) {
1.469 - return new String(b, 0, len);
1.470 - }
1.471 -}