1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/emul/mini/src/main/java/org/apidesign/bck2brwsr/emul/zip/ZipInputStream.java Thu Feb 07 12:58:12 2013 +0100
1.3 @@ -0,0 +1,468 @@
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 +}