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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package com.feilong.lib.compress.archivers.zip;
import static com.feilong.lib.compress.archivers.zip.ZipConstants.DWORD;
import static com.feilong.lib.compress.archivers.zip.ZipConstants.SHORT;
import static com.feilong.lib.compress.archivers.zip.ZipConstants.WORD;
import static com.feilong.lib.compress.archivers.zip.ZipConstants.ZIP64_MAGIC;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.zip.CRC32;
import java.util.zip.DataFormatException;
import java.util.zip.Inflater;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import com.feilong.lib.compress.archivers.ArchiveEntry;
import com.feilong.lib.compress.archivers.ArchiveInputStream;
import com.feilong.lib.compress.utils.ArchiveUtils;
import com.feilong.lib.compress.utils.IOUtils;
import com.feilong.lib.compress.utils.InputStreamStatistics;
/**
* Implements an input stream that can read Zip archives.
*
*
* As of Apache Commons Compress it transparently supports Zip64
* extensions and thus individual entries and archives larger than 4
* GB or with more than 65536 entries.
*
*
*
* The {@link ZipFile} class is preferred when reading from files
* as {@link ZipArchiveInputStream} is limited by not being able to
* read the central directory header before returning entries. In
* particular {@link ZipArchiveInputStream}
*
*
*
*
* - may return entries that are not part of the central directory
* at all and shouldn't be considered part of the archive.
*
* - may return several entries with the same name.
*
* - will not return internal or external attributes.
*
* - may return incomplete extra field data.
*
* - may return unknown sizes and CRC values for entries until the
* next entry has been reached if the archive uses the data
* descriptor feature.
*
*
*
* @see ZipFile
* @NotThreadSafe
*/
public class ZipArchiveInputStream extends ArchiveInputStream implements InputStreamStatistics{
/** The zip encoding to use for file names and the file comment. */
private final ZipEncoding zipEncoding;
// the provided encoding (for unit tests)
final String encoding;
/** Whether to look for and use Unicode extra fields. */
private final boolean useUnicodeExtraFields;
/** Wrapped stream, will always be a PushbackInputStream. */
private final InputStream in;
/** Inflater used for all deflated entries. */
private final Inflater inf = new Inflater(true);
/** Buffer used to read from the wrapped stream. */
private final ByteBuffer buf = ByteBuffer.allocate(ZipArchiveOutputStream.BUFFER_SIZE);
/** The entry that is currently being read. */
private CurrentEntry current = null;
/** Whether the stream has been closed. */
private boolean closed = false;
/** Whether the stream has reached the central directory - and thus found all entries. */
private boolean hitCentralDirectory = false;
/**
* When reading a stored entry that uses the data descriptor this
* stream has to read the full entry and caches it. This is the
* cache.
*/
private ByteArrayInputStream lastStoredEntry = null;
/** Whether the stream will try to read STORED entries that use a data descriptor. */
private boolean allowStoredEntriesWithDataDescriptor = false;
/** Count decompressed bytes for current entry */
private long uncompressedCount = 0;
/** Whether the stream will try to skip the zip split signature(08074B50) at the beginning **/
private final boolean skipSplitSig;
private static final int LFH_LEN = 30;
/*
* local file header signature WORD
* version needed to extract SHORT
* general purpose bit flag SHORT
* compression method SHORT
* last mod file time SHORT
* last mod file date SHORT
* crc-32 WORD
* compressed size WORD
* uncompressed size WORD
* file name length SHORT
* extra field length SHORT
*/
private static final int CFH_LEN = 46;
/*
* central file header signature WORD
* version made by SHORT
* version needed to extract SHORT
* general purpose bit flag SHORT
* compression method SHORT
* last mod file time SHORT
* last mod file date SHORT
* crc-32 WORD
* compressed size WORD
* uncompressed size WORD
* file name length SHORT
* extra field length SHORT
* file comment length SHORT
* disk number start SHORT
* internal file attributes SHORT
* external file attributes WORD
* relative offset of local header WORD
*/
private static final long TWO_EXP_32 = ZIP64_MAGIC + 1;
// cached buffers - must only be used locally in the class (COMPRESS-172 - reduce garbage collection)
private final byte[] lfhBuf = new byte[LFH_LEN];
private final byte[] skipBuf = new byte[1024];
private final byte[] shortBuf = new byte[SHORT];
private final byte[] wordBuf = new byte[WORD];
private final byte[] twoDwordBuf = new byte[2 * DWORD];
private int entriesRead = 0;
/**
* Create an instance using UTF-8 encoding
*
* @param inputStream
* the stream to wrap
*/
public ZipArchiveInputStream(final InputStream inputStream){
this(inputStream, ZipEncodingHelper.UTF8);
}
/**
* Create an instance using the specified encoding
*
* @param inputStream
* the stream to wrap
* @param encoding
* the encoding to use for file names, use null
* for the platform's default encoding
* @since 1.5
*/
public ZipArchiveInputStream(final InputStream inputStream, final String encoding){
this(inputStream, encoding, true);
}
/**
* Create an instance using the specified encoding
*
* @param inputStream
* the stream to wrap
* @param encoding
* the encoding to use for file names, use null
* for the platform's default encoding
* @param useUnicodeExtraFields
* whether to use InfoZIP Unicode
* Extra Fields (if present) to set the file names.
*/
public ZipArchiveInputStream(final InputStream inputStream, final String encoding, final boolean useUnicodeExtraFields){
this(inputStream, encoding, useUnicodeExtraFields, false);
}
/**
* Create an instance using the specified encoding
*
* @param inputStream
* the stream to wrap
* @param encoding
* the encoding to use for file names, use null
* for the platform's default encoding
* @param useUnicodeExtraFields
* whether to use InfoZIP Unicode
* Extra Fields (if present) to set the file names.
* @param allowStoredEntriesWithDataDescriptor
* whether the stream
* will try to read STORED entries that use a data descriptor
* @since 1.1
*/
public ZipArchiveInputStream(final InputStream inputStream, final String encoding, final boolean useUnicodeExtraFields,
final boolean allowStoredEntriesWithDataDescriptor){
this(inputStream, encoding, useUnicodeExtraFields, allowStoredEntriesWithDataDescriptor, false);
}
/**
* Create an instance using the specified encoding
*
* @param inputStream
* the stream to wrap
* @param encoding
* the encoding to use for file names, use null
* for the platform's default encoding
* @param useUnicodeExtraFields
* whether to use InfoZIP Unicode
* Extra Fields (if present) to set the file names.
* @param allowStoredEntriesWithDataDescriptor
* whether the stream
* will try to read STORED entries that use a data descriptor
* @param skipSplitSig
* Whether the stream will try to skip the zip
* split signature(08074B50) at the beginning. You will need to
* set this to true if you want to read a split archive.
* @since 1.20
*/
public ZipArchiveInputStream(final InputStream inputStream, final String encoding, final boolean useUnicodeExtraFields,
final boolean allowStoredEntriesWithDataDescriptor, final boolean skipSplitSig){
this.encoding = encoding;
zipEncoding = ZipEncodingHelper.getZipEncoding(encoding);
this.useUnicodeExtraFields = useUnicodeExtraFields;
in = new PushbackInputStream(inputStream, buf.capacity());
this.allowStoredEntriesWithDataDescriptor = allowStoredEntriesWithDataDescriptor;
this.skipSplitSig = skipSplitSig;
// haven't read anything so far
buf.limit(0);
}
public ZipArchiveEntry getNextZipEntry() throws IOException{
uncompressedCount = 0;
boolean firstEntry = true;
if (closed || hitCentralDirectory){
return null;
}
if (current != null){
closeEntry();
firstEntry = false;
}
long currentHeaderOffset = getBytesRead();
try{
if (firstEntry){
// split archives have a special signature before the
// first local file header - look for it and fail with
// the appropriate error message if this is a split
// archive.
readFirstLocalFileHeader(lfhBuf);
}else{
readFully(lfhBuf);
}
}catch (final EOFException e){ //NOSONAR
return null;
}
final ZipLong sig = new ZipLong(lfhBuf);
if (!sig.equals(ZipLong.LFH_SIG)){
if (sig.equals(ZipLong.CFH_SIG) || sig.equals(ZipLong.AED_SIG) || isApkSigningBlock(lfhBuf)){
hitCentralDirectory = true;
skipRemainderOfArchive();
return null;
}
throw new ZipException(String.format("Unexpected record signature: 0X%X", sig.getValue()));
}
int off = WORD;
current = new CurrentEntry();
final int versionMadeBy = ZipShort.getValue(lfhBuf, off);
off += SHORT;
current.entry.setPlatform((versionMadeBy >> ZipFile.BYTE_SHIFT) & ZipFile.NIBLET_MASK);
final GeneralPurposeBit gpFlag = GeneralPurposeBit.parse(lfhBuf, off);
final boolean hasUTF8Flag = gpFlag.usesUTF8ForNames();
final ZipEncoding entryEncoding = hasUTF8Flag ? ZipEncodingHelper.UTF8_ZIP_ENCODING : zipEncoding;
current.hasDataDescriptor = gpFlag.usesDataDescriptor();
current.entry.setGeneralPurposeBit(gpFlag);
off += SHORT;
current.entry.setMethod(ZipShort.getValue(lfhBuf, off));
off += SHORT;
final long time = ZipUtil.dosToJavaTime(ZipLong.getValue(lfhBuf, off));
current.entry.setTime(time);
off += WORD;
ZipLong size = null, cSize = null;
if (!current.hasDataDescriptor){
current.entry.setCrc(ZipLong.getValue(lfhBuf, off));
off += WORD;
cSize = new ZipLong(lfhBuf, off);
off += WORD;
size = new ZipLong(lfhBuf, off);
off += WORD;
}else{
off += 3 * WORD;
}
final int fileNameLen = ZipShort.getValue(lfhBuf, off);
off += SHORT;
final int extraLen = ZipShort.getValue(lfhBuf, off);
off += SHORT; // NOSONAR - assignment as documentation
final byte[] fileName = new byte[fileNameLen];
readFully(fileName);
current.entry.setName(entryEncoding.decode(fileName), fileName);
if (hasUTF8Flag){
current.entry.setNameSource(ZipArchiveEntry.NameSource.NAME_WITH_EFS_FLAG);
}
final byte[] extraData = new byte[extraLen];
readFully(extraData);
current.entry.setExtra(extraData);
if (!hasUTF8Flag && useUnicodeExtraFields){
ZipUtil.setNameAndCommentFromExtraFields(current.entry, fileName, null);
}
processZip64Extra(size, cSize);
current.entry.setLocalHeaderOffset(currentHeaderOffset);
current.entry.setDataOffset(getBytesRead());
current.entry.setStreamContiguous(true);
ZipMethod m = ZipMethod.getMethodByCode(current.entry.getMethod());
if (current.entry.getCompressedSize() != ArchiveEntry.SIZE_UNKNOWN){
if (ZipUtil.canHandleEntryData(current.entry) && m != ZipMethod.STORED && m != ZipMethod.DEFLATED){
InputStream bis = new BoundedInputStream(in, current.entry.getCompressedSize());
switch (m) {
// case UNSHRINKING:
// current.in = new UnshrinkingInputStream(bis);
// break;
case IMPLODING:
current.in = new ExplodingInputStream(
current.entry.getGeneralPurposeBit().getSlidingDictionarySize(),
current.entry.getGeneralPurposeBit().getNumberOfShannonFanoTrees(),
bis);
break;
// case BZIP2:
// current.in = new BZip2CompressorInputStream(bis);
// break;
// case ENHANCED_DEFLATED:
// current.in = new Deflate64CompressorInputStream(bis);
// break;
default:
// we should never get here as all supported methods have been covered
// will cause an error when read is invoked, don't throw an exception here so people can
// skip unsupported entries
break;
}
}
}
// else if (m == ZipMethod.ENHANCED_DEFLATED) {
// current.in = new Deflate64CompressorInputStream(in);
// }
entriesRead++;
return current.entry;
}
/**
* Fills the given array with the first local file header and
* deals with splitting/spanning markers that may prefix the first
* LFH.
*/
private void readFirstLocalFileHeader(final byte[] lfh) throws IOException{
readFully(lfh);
final ZipLong sig = new ZipLong(lfh);
if (!skipSplitSig && sig.equals(ZipLong.DD_SIG)){
throw new UnsupportedZipFeatureException(UnsupportedZipFeatureException.Feature.SPLITTING);
}
// the split zip signature(08074B50) should only be skipped when the skipSplitSig is set
if (sig.equals(ZipLong.SINGLE_SEGMENT_SPLIT_MARKER) || sig.equals(ZipLong.DD_SIG)){
// Just skip over the marker.
final byte[] missedLfhBytes = new byte[4];
readFully(missedLfhBytes);
System.arraycopy(lfh, 4, lfh, 0, LFH_LEN - 4);
System.arraycopy(missedLfhBytes, 0, lfh, LFH_LEN - 4, 4);
}
}
/**
* Records whether a Zip64 extra is present and sets the size
* information from it if sizes are 0xFFFFFFFF and the entry
* doesn't use a data descriptor.
*/
private void processZip64Extra(final ZipLong size,final ZipLong cSize){
final Zip64ExtendedInformationExtraField z64 = (Zip64ExtendedInformationExtraField) current.entry
.getExtraField(Zip64ExtendedInformationExtraField.HEADER_ID);
current.usesZip64 = z64 != null;
if (!current.hasDataDescriptor){
if (z64 != null // same as current.usesZip64 but avoids NPE warning
&& (ZipLong.ZIP64_MAGIC.equals(cSize) || ZipLong.ZIP64_MAGIC.equals(size))){
current.entry.setCompressedSize(z64.getCompressedSize().getLongValue());
current.entry.setSize(z64.getSize().getLongValue());
}else if (cSize != null && size != null){
current.entry.setCompressedSize(cSize.getValue());
current.entry.setSize(size.getValue());
}
}
}
@Override
public ArchiveEntry getNextEntry() throws IOException{
return getNextZipEntry();
}
/**
* Whether this class is able to read the given entry.
*
*
* May return false if it is set up to use encryption or a
* compression method that hasn't been implemented yet.
*
*
* @since 1.1
*/
@Override
public boolean canReadEntryData(final ArchiveEntry ae){
if (ae instanceof ZipArchiveEntry){
final ZipArchiveEntry ze = (ZipArchiveEntry) ae;
return ZipUtil.canHandleEntryData(ze) && supportsDataDescriptorFor(ze) && supportsCompressedSizeFor(ze);
}
return false;
}
@Override
public int read(final byte[] buffer,final int offset,final int length) throws IOException{
if (length == 0){
return 0;
}
if (closed){
throw new IOException("The stream is closed");
}
if (current == null){
return -1;
}
// avoid int overflow, check null buffer
if (offset > buffer.length || length < 0 || offset < 0 || buffer.length - offset < length){
throw new ArrayIndexOutOfBoundsException();
}
ZipUtil.checkRequestedFeatures(current.entry);
if (!supportsDataDescriptorFor(current.entry)){
throw new UnsupportedZipFeatureException(UnsupportedZipFeatureException.Feature.DATA_DESCRIPTOR, current.entry);
}
if (!supportsCompressedSizeFor(current.entry)){
throw new UnsupportedZipFeatureException(UnsupportedZipFeatureException.Feature.UNKNOWN_COMPRESSED_SIZE, current.entry);
}
int read;
if (current.entry.getMethod() == ZipArchiveOutputStream.STORED){
read = readStored(buffer, offset, length);
}else if (current.entry.getMethod() == ZipArchiveOutputStream.DEFLATED){
read = readDeflated(buffer, offset, length);
}else if (current.entry.getMethod() == ZipMethod.UNSHRINKING.getCode() || current.entry.getMethod() == ZipMethod.IMPLODING.getCode()
|| current.entry.getMethod() == ZipMethod.ENHANCED_DEFLATED.getCode()
|| current.entry.getMethod() == ZipMethod.BZIP2.getCode()){
read = current.in.read(buffer, offset, length);
}else{
throw new UnsupportedZipFeatureException(ZipMethod.getMethodByCode(current.entry.getMethod()), current.entry);
}
if (read >= 0){
current.crc.update(buffer, offset, read);
uncompressedCount += read;
}
return read;
}
/**
* @since 1.17
*/
@Override
public long getCompressedCount(){
if (current.entry.getMethod() == ZipArchiveOutputStream.STORED){
return current.bytesRead;
}else if (current.entry.getMethod() == ZipArchiveOutputStream.DEFLATED){
return getBytesInflated();
}
// else if (current.entry.getMethod() == ZipMethod.UNSHRINKING.getCode()) {
// return ((UnshrinkingInputStream) current.in).getCompressedCount();
// } else if (current.entry.getMethod() == ZipMethod.IMPLODING.getCode()) {
// return ((ExplodingInputStream) current.in).getCompressedCount();
// } else if (current.entry.getMethod() == ZipMethod.ENHANCED_DEFLATED.getCode()) {
// return ((Deflate64CompressorInputStream) current.in).getCompressedCount();
// } else if (current.entry.getMethod() == ZipMethod.BZIP2.getCode()) {
// return ((BZip2CompressorInputStream) current.in).getCompressedCount();
// }
else{
return -1;
}
}
/**
* @since 1.17
*/
@Override
public long getUncompressedCount(){
return uncompressedCount;
}
/**
* Implementation of read for STORED entries.
*/
private int readStored(final byte[] buffer,final int offset,final int length) throws IOException{
if (current.hasDataDescriptor){
if (lastStoredEntry == null){
readStoredEntry();
}
return lastStoredEntry.read(buffer, offset, length);
}
final long csize = current.entry.getSize();
if (current.bytesRead >= csize){
return -1;
}
if (buf.position() >= buf.limit()){
buf.position(0);
final int l = in.read(buf.array());
if (l == -1){
buf.limit(0);
throw new IOException("Truncated ZIP file");
}
buf.limit(l);
count(l);
current.bytesReadFromStream += l;
}
int toRead = Math.min(buf.remaining(), length);
if ((csize - current.bytesRead) < toRead){
// if it is smaller than toRead then it fits into an int
toRead = (int) (csize - current.bytesRead);
}
buf.get(buffer, offset, toRead);
current.bytesRead += toRead;
return toRead;
}
/**
* Implementation of read for DEFLATED entries.
*/
private int readDeflated(final byte[] buffer,final int offset,final int length) throws IOException{
final int read = readFromInflater(buffer, offset, length);
if (read <= 0){
if (inf.finished()){
return -1;
}else if (inf.needsDictionary()){
throw new ZipException("This archive needs a preset dictionary" + " which is not supported by Commons" + " Compress.");
}else if (read == -1){
throw new IOException("Truncated ZIP file");
}
}
return read;
}
/**
* Potentially reads more bytes to fill the inflater's buffer and
* reads from it.
*/
private int readFromInflater(final byte[] buffer,final int offset,final int length) throws IOException{
int read = 0;
do{
if (inf.needsInput()){
final int l = fill();
if (l > 0){
current.bytesReadFromStream += buf.limit();
}else if (l == -1){
return -1;
}else{
break;
}
}
try{
read = inf.inflate(buffer, offset, length);
}catch (final DataFormatException e){
throw (IOException) new ZipException(e.getMessage()).initCause(e);
}
}while (read == 0 && inf.needsInput());
return read;
}
@Override
public void close() throws IOException{
if (!closed){
closed = true;
try{
in.close();
}finally{
inf.end();
}
}
}
/**
* Skips over and discards value bytes of data from this input
* stream.
*
*
* This implementation may end up skipping over some smaller
* number of bytes, possibly 0, if and only if it reaches the end
* of the underlying stream.
*
*
*
* The actual number of bytes skipped is returned.
*
*
* @param value
* the number of bytes to be skipped.
* @return the actual number of bytes skipped.
* @throws IOException
* - if an I/O error occurs.
* @throws IllegalArgumentException
* - if value is negative.
*/
@Override
public long skip(final long value) throws IOException{
if (value >= 0){
long skipped = 0;
while (skipped < value){
final long rem = value - skipped;
final int x = read(skipBuf, 0, (int) (skipBuf.length > rem ? rem : skipBuf.length));
if (x == -1){
return skipped;
}
skipped += x;
}
return skipped;
}
throw new IllegalArgumentException();
}
/**
* Checks if the signature matches what is expected for a zip file.
* Does not currently handle self-extracting zips which may have arbitrary
* leading content.
*
* @param signature
* the bytes to check
* @param length
* the number of bytes to check
* @return true, if this stream is a zip archive stream, false otherwise
*/
public static boolean matches(final byte[] signature,final int length){
if (length < ZipArchiveOutputStream.LFH_SIG.length){
return false;
}
return checksig(signature, ZipArchiveOutputStream.LFH_SIG) // normal file
|| checksig(signature, ZipArchiveOutputStream.EOCD_SIG) // empty zip
|| checksig(signature, ZipArchiveOutputStream.DD_SIG) // split zip
|| checksig(signature, ZipLong.SINGLE_SEGMENT_SPLIT_MARKER.getBytes());
}
private static boolean checksig(final byte[] signature,final byte[] expected){
for (int i = 0; i < expected.length; i++){
if (signature[i] != expected[i]){
return false;
}
}
return true;
}
/**
* Closes the current ZIP archive entry and positions the underlying
* stream to the beginning of the next entry. All per-entry variables
* and data structures are cleared.
*
* If the compressed size of this entry is included in the entry header,
* then any outstanding bytes are simply skipped from the underlying
* stream without uncompressing them. This allows an entry to be safely
* closed even if the compression method is unsupported.
*
* In case we don't know the compressed size of this entry or have
* already buffered too much data from the underlying stream to support
* uncompression, then the uncompression process is completed and the
* end position of the stream is adjusted based on the result of that
* process.
*
* @throws IOException
* if an error occurs
*/
private void closeEntry() throws IOException{
if (closed){
throw new IOException("The stream is closed");
}
if (current == null){
return;
}
// Ensure all entry bytes are read
if (currentEntryHasOutstandingBytes()){
drainCurrentEntryData();
}else{
// this is guaranteed to exhaust the stream
skip(Long.MAX_VALUE); //NOSONAR
final long inB = current.entry.getMethod() == ZipArchiveOutputStream.DEFLATED ? getBytesInflated() : current.bytesRead;
// this is at most a single read() operation and can't
// exceed the range of int
final int diff = (int) (current.bytesReadFromStream - inB);
// Pushback any required bytes
if (diff > 0){
pushback(buf.array(), buf.limit() - diff, diff);
current.bytesReadFromStream -= diff;
}
// Drain remainder of entry if not all data bytes were required
if (currentEntryHasOutstandingBytes()){
drainCurrentEntryData();
}
}
if (lastStoredEntry == null && current.hasDataDescriptor){
readDataDescriptor();
}
inf.reset();
buf.clear().flip();
current = null;
lastStoredEntry = null;
}
/**
* If the compressed size of the current entry is included in the entry header
* and there are any outstanding bytes in the underlying stream, then
* this returns true.
*
* @return true, if current entry is determined to have outstanding bytes, false otherwise
*/
private boolean currentEntryHasOutstandingBytes(){
return current.bytesReadFromStream <= current.entry.getCompressedSize() && !current.hasDataDescriptor;
}
/**
* Read all data of the current entry from the underlying stream
* that hasn't been read, yet.
*/
private void drainCurrentEntryData() throws IOException{
long remaining = current.entry.getCompressedSize() - current.bytesReadFromStream;
while (remaining > 0){
final long n = in.read(buf.array(), 0, (int) Math.min(buf.capacity(), remaining));
if (n < 0){
throw new EOFException("Truncated ZIP entry: " + ArchiveUtils.sanitize(current.entry.getName()));
}
count(n);
remaining -= n;
}
}
/**
* Get the number of bytes Inflater has actually processed.
*
*
* for Java < Java7 the getBytes* methods in
* Inflater/Deflater seem to return unsigned ints rather than
* longs that start over with 0 at 2^32.
*
*
*
* The stream knows how many bytes it has read, but not how
* many the Inflater actually consumed - it should be between the
* total number of bytes read for the entry and the total number
* minus the last read operation. Here we just try to make the
* value close enough to the bytes we've read by assuming the
* number of bytes consumed must be smaller than (or equal to) the
* number of bytes read but not smaller by more than 2^32.
*
*/
private long getBytesInflated(){
long inB = inf.getBytesRead();
if (current.bytesReadFromStream >= TWO_EXP_32){
while (inB + TWO_EXP_32 <= current.bytesReadFromStream){
inB += TWO_EXP_32;
}
}
return inB;
}
private int fill() throws IOException{
if (closed){
throw new IOException("The stream is closed");
}
final int length = in.read(buf.array());
if (length > 0){
buf.limit(length);
count(buf.limit());
inf.setInput(buf.array(), 0, buf.limit());
}
return length;
}
private void readFully(final byte[] b) throws IOException{
readFully(b, 0);
}
private void readFully(final byte[] b,final int off) throws IOException{
final int len = b.length - off;
final int count = IOUtils.readFully(in, b, off, len);
count(count);
if (count < len){
throw new EOFException();
}
}
private void readDataDescriptor() throws IOException{
readFully(wordBuf);
ZipLong val = new ZipLong(wordBuf);
if (ZipLong.DD_SIG.equals(val)){
// data descriptor with signature, skip sig
readFully(wordBuf);
val = new ZipLong(wordBuf);
}
current.entry.setCrc(val.getValue());
// if there is a ZIP64 extra field, sizes are eight bytes
// each, otherwise four bytes each. Unfortunately some
// implementations - namely Java7 - use eight bytes without
// using a ZIP64 extra field -
// https://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7073588
// just read 16 bytes and check whether bytes nine to twelve
// look like one of the signatures of what could follow a data
// descriptor (ignoring archive decryption headers for now).
// If so, push back eight bytes and assume sizes are four
// bytes, otherwise sizes are eight bytes each.
readFully(twoDwordBuf);
final ZipLong potentialSig = new ZipLong(twoDwordBuf, DWORD);
if (potentialSig.equals(ZipLong.CFH_SIG) || potentialSig.equals(ZipLong.LFH_SIG)){
pushback(twoDwordBuf, DWORD, DWORD);
current.entry.setCompressedSize(ZipLong.getValue(twoDwordBuf));
current.entry.setSize(ZipLong.getValue(twoDwordBuf, WORD));
}else{
current.entry.setCompressedSize(ZipEightByteInteger.getLongValue(twoDwordBuf));
current.entry.setSize(ZipEightByteInteger.getLongValue(twoDwordBuf, DWORD));
}
}
/**
* Whether this entry requires a data descriptor this library can work with.
*
* @return true if allowStoredEntriesWithDataDescriptor is true,
* the entry doesn't require any data descriptor or the method is
* DEFLATED or ENHANCED_DEFLATED.
*/
private boolean supportsDataDescriptorFor(final ZipArchiveEntry entry){
return !entry.getGeneralPurposeBit().usesDataDescriptor()
|| (allowStoredEntriesWithDataDescriptor && entry.getMethod() == ZipEntry.STORED)
|| entry.getMethod() == ZipEntry.DEFLATED || entry.getMethod() == ZipMethod.ENHANCED_DEFLATED.getCode();
}
/**
* Whether the compressed size for the entry is either known or
* not required by the compression method being used.
*/
private boolean supportsCompressedSizeFor(final ZipArchiveEntry entry){
return entry.getCompressedSize() != ArchiveEntry.SIZE_UNKNOWN || entry.getMethod() == ZipEntry.DEFLATED
|| entry.getMethod() == ZipMethod.ENHANCED_DEFLATED.getCode() || (entry.getGeneralPurposeBit().usesDataDescriptor()
&& allowStoredEntriesWithDataDescriptor && entry.getMethod() == ZipEntry.STORED);
}
private static final String USE_ZIPFILE_INSTEAD_OF_STREAM_DISCLAIMER = " while reading a stored entry using data descriptor. Either the archive is broken"
+ " or it can not be read using ZipArchiveInputStream and you must use ZipFile."
+ " A common cause for this is a ZIP archive containing a ZIP archive."
+ " See http://commons.apache.org/proper/commons-compress/zip.html#ZipArchiveInputStream_vs_ZipFile";
/**
* Caches a stored entry that uses the data descriptor.
*
*
* - Reads a stored entry until the signature of a local file
* header, central directory header or data descriptor has been
* found.
* - Stores all entry data in lastStoredEntry.
*
*
- Rewinds the stream to position at the data
* descriptor.
* - reads the data descriptor
*
*
*
* After calling this method the entry should know its size,
* the entry's data is cached and the stream is positioned at the
* next local file or central directory header.
*
*/
private void readStoredEntry() throws IOException{
final ByteArrayOutputStream bos = new ByteArrayOutputStream();
int off = 0;
boolean done = false;
// length of DD without signature
final int ddLen = current.usesZip64 ? WORD + 2 * DWORD : 3 * WORD;
while (!done){
final int r = in.read(buf.array(), off, ZipArchiveOutputStream.BUFFER_SIZE - off);
if (r <= 0){
// read the whole archive without ever finding a
// central directory
throw new IOException("Truncated ZIP file");
}
if (r + off < 4){
// buffer too small to check for a signature, loop
off += r;
continue;
}
done = bufferContainsSignature(bos, off, r, ddLen);
if (!done){
off = cacheBytesRead(bos, off, r, ddLen);
}
}
if (current.entry.getCompressedSize() != current.entry.getSize()){
throw new ZipException("compressed and uncompressed size don't match" + USE_ZIPFILE_INSTEAD_OF_STREAM_DISCLAIMER);
}
final byte[] b = bos.toByteArray();
if (b.length != current.entry.getSize()){
throw new ZipException("actual and claimed size don't match" + USE_ZIPFILE_INSTEAD_OF_STREAM_DISCLAIMER);
}
lastStoredEntry = new ByteArrayInputStream(b);
}
private static final byte[] LFH = ZipLong.LFH_SIG.getBytes();
private static final byte[] CFH = ZipLong.CFH_SIG.getBytes();
private static final byte[] DD = ZipLong.DD_SIG.getBytes();
/**
* Checks whether the current buffer contains the signature of a
* "data descriptor", "local file header" or
* "central directory entry".
*
*
* If it contains such a signature, reads the data descriptor
* and positions the stream right after the data descriptor.
*
*/
private boolean bufferContainsSignature(final ByteArrayOutputStream bos,final int offset,final int lastRead,final int expectedDDLen)
throws IOException{
boolean done = false;
for (int i = 0; !done && i < offset + lastRead - 4; i++){
if (buf.array()[i] == LFH[0] && buf.array()[i + 1] == LFH[1]){
int expectDDPos = i;
if (i >= expectedDDLen && (buf.array()[i + 2] == LFH[2] && buf.array()[i + 3] == LFH[3])
|| (buf.array()[i] == CFH[2] && buf.array()[i + 3] == CFH[3])){
// found a LFH or CFH:
expectDDPos = i - expectedDDLen;
done = true;
}else if (buf.array()[i + 2] == DD[2] && buf.array()[i + 3] == DD[3]){
// found DD:
done = true;
}
if (done){
// * push back bytes read in excess as well as the data
// descriptor
// * copy the remaining bytes to cache
// * read data descriptor
pushback(buf.array(), expectDDPos, offset + lastRead - expectDDPos);
bos.write(buf.array(), 0, expectDDPos);
readDataDescriptor();
}
}
}
return done;
}
/**
* If the last read bytes could hold a data descriptor and an
* incomplete signature then save the last bytes to the front of
* the buffer and cache everything in front of the potential data
* descriptor into the given ByteArrayOutputStream.
*
*
* Data descriptor plus incomplete signature (3 bytes in the
* worst case) can be 20 bytes max.
*
*/
private int cacheBytesRead(final ByteArrayOutputStream bos,int offset,final int lastRead,final int expecteDDLen){
final int cacheable = offset + lastRead - expecteDDLen - 3;
if (cacheable > 0){
bos.write(buf.array(), 0, cacheable);
System.arraycopy(buf.array(), cacheable, buf.array(), 0, expecteDDLen + 3);
offset = expecteDDLen + 3;
}else{
offset += lastRead;
}
return offset;
}
private void pushback(final byte[] buf,final int offset,final int length) throws IOException{
((PushbackInputStream) in).unread(buf, offset, length);
pushedBackBytes(length);
}
// End of Central Directory Record
// end of central dir signature WORD
// number of this disk SHORT
// number of the disk with the
// start of the central directory SHORT
// total number of entries in the
// central directory on this disk SHORT
// total number of entries in
// the central directory SHORT
// size of the central directory WORD
// offset of start of central
// directory with respect to
// the starting disk number WORD
// .ZIP file comment length SHORT
// .ZIP file comment up to 64KB
//
/**
* Reads the stream until it find the "End of central directory
* record" and consumes it as well.
*/
private void skipRemainderOfArchive() throws IOException{
// skip over central directory. One LFH has been read too much
// already. The calculation discounts file names and extra
// data so it will be too short.
realSkip((long) entriesRead * CFH_LEN - LFH_LEN);
findEocdRecord();
realSkip((long) ZipFile.MIN_EOCD_SIZE - WORD /* signature */ - SHORT /* comment len */);
readFully(shortBuf);
// file comment
realSkip(ZipShort.getValue(shortBuf));
}
/**
* Reads forward until the signature of the "End of central
* directory" record is found.
*/
private void findEocdRecord() throws IOException{
int currentByte = -1;
boolean skipReadCall = false;
while (skipReadCall || (currentByte = readOneByte()) > -1){
skipReadCall = false;
if (!isFirstByteOfEocdSig(currentByte)){
continue;
}
currentByte = readOneByte();
if (currentByte != ZipArchiveOutputStream.EOCD_SIG[1]){
if (currentByte == -1){
break;
}
skipReadCall = isFirstByteOfEocdSig(currentByte);
continue;
}
currentByte = readOneByte();
if (currentByte != ZipArchiveOutputStream.EOCD_SIG[2]){
if (currentByte == -1){
break;
}
skipReadCall = isFirstByteOfEocdSig(currentByte);
continue;
}
currentByte = readOneByte();
if (currentByte == -1 || currentByte == ZipArchiveOutputStream.EOCD_SIG[3]){
break;
}
skipReadCall = isFirstByteOfEocdSig(currentByte);
}
}
/**
* Skips bytes by reading from the underlying stream rather than
* the (potentially inflating) archive stream - which {@link
* #skip} would do.
*
* Also updates bytes-read counter.
*/
private void realSkip(final long value) throws IOException{
if (value >= 0){
long skipped = 0;
while (skipped < value){
final long rem = value - skipped;
final int x = in.read(skipBuf, 0, (int) (skipBuf.length > rem ? rem : skipBuf.length));
if (x == -1){
return;
}
count(x);
skipped += x;
}
return;
}
throw new IllegalArgumentException();
}
/**
* Reads bytes by reading from the underlying stream rather than
* the (potentially inflating) archive stream - which {@link #read} would do.
*
* Also updates bytes-read counter.
*/
private int readOneByte() throws IOException{
final int b = in.read();
if (b != -1){
count(1);
}
return b;
}
private boolean isFirstByteOfEocdSig(final int b){
return b == ZipArchiveOutputStream.EOCD_SIG[0];
}
private static final byte[] APK_SIGNING_BLOCK_MAGIC = new byte[] {
'A',
'P',
'K',
' ',
'S',
'i',
'g',
' ',
'B',
'l',
'o',
'c',
'k',
' ',
'4',
'2', };
private static final BigInteger LONG_MAX = BigInteger.valueOf(Long.MAX_VALUE);
/**
* Checks whether this might be an APK Signing Block.
*
*
* Unfortunately the APK signing block does not start with some kind of signature, it rather ends with one. It
* starts with a length, so what we do is parse the suspect length, skip ahead far enough, look for the signature
* and if we've found it, return true.
*
*
* @param suspectLocalFileHeader
* the bytes read from the underlying stream in the expectation that they would hold
* the local file header of the next entry.
*
* @return true if this looks like a APK signing block
*
* @see https://source.android.com/security/apksigning/v2
*/
private boolean isApkSigningBlock(byte[] suspectLocalFileHeader) throws IOException{
// length of block excluding the size field itself
BigInteger len = ZipEightByteInteger.getValue(suspectLocalFileHeader);
// LFH has already been read and all but the first eight bytes contain (part of) the APK signing block,
// also subtract 16 bytes in order to position us at the magic string
BigInteger toSkip = len.add(BigInteger.valueOf(DWORD - suspectLocalFileHeader.length - (long) APK_SIGNING_BLOCK_MAGIC.length));
byte[] magic = new byte[APK_SIGNING_BLOCK_MAGIC.length];
try{
if (toSkip.signum() < 0){
// suspectLocalFileHeader contains the start of suspect magic string
int off = suspectLocalFileHeader.length + toSkip.intValue();
// length was shorter than magic length
if (off < DWORD){
return false;
}
int bytesInBuffer = Math.abs(toSkip.intValue());
System.arraycopy(suspectLocalFileHeader, off, magic, 0, Math.min(bytesInBuffer, magic.length));
if (bytesInBuffer < magic.length){
readFully(magic, bytesInBuffer);
}
}else{
while (toSkip.compareTo(LONG_MAX) > 0){
realSkip(Long.MAX_VALUE);
toSkip = toSkip.add(LONG_MAX.negate());
}
realSkip(toSkip.longValue());
readFully(magic);
}
}catch (EOFException ex){ //NOSONAR
// length was invalid
return false;
}
return Arrays.equals(magic, APK_SIGNING_BLOCK_MAGIC);
}
/**
* Structure collecting information for the entry that is
* currently being read.
*/
private static final class CurrentEntry{
/**
* Current ZIP entry.
*/
private final ZipArchiveEntry entry = new ZipArchiveEntry();
/**
* Does the entry use a data descriptor?
*/
private boolean hasDataDescriptor;
/**
* Does the entry have a ZIP64 extended information extra field.
*/
private boolean usesZip64;
/**
* Number of bytes of entry content read by the client if the
* entry is STORED.
*/
private long bytesRead;
/**
* Number of bytes of entry content read from the stream.
*
*
* This may be more than the actual entry's length as some
* stuff gets buffered up and needs to be pushed back when the
* end of the entry has been reached.
*
*/
private long bytesReadFromStream;
/**
* The checksum calculated as the current entry is read.
*/
private final CRC32 crc = new CRC32();
/**
* The input stream decompressing the data for shrunk and imploded entries.
*/
private InputStream in;
}
/**
* Bounded input stream adapted from commons-io
*/
private class BoundedInputStream extends InputStream{
/** the wrapped input stream */
private final InputStream in;
/** the max length to provide */
private final long max;
/** the number of bytes already returned */
private long pos = 0;
/**
* Creates a new BoundedInputStream that wraps the given input
* stream and limits it to a certain size.
*
* @param in
* The wrapped input stream
* @param size
* The maximum number of bytes to return
*/
public BoundedInputStream(final InputStream in, final long size){
this.max = size;
this.in = in;
}
@Override
public int read() throws IOException{
if (max >= 0 && pos >= max){
return -1;
}
final int result = in.read();
pos++;
count(1);
current.bytesReadFromStream++;
return result;
}
@Override
public int read(final byte[] b) throws IOException{
return this.read(b, 0, b.length);
}
@Override
public int read(final byte[] b,final int off,final int len) throws IOException{
if (len == 0){
return 0;
}
if (max >= 0 && pos >= max){
return -1;
}
final long maxRead = max >= 0 ? Math.min(len, max - pos) : len;
final int bytesRead = in.read(b, off, (int) maxRead);
if (bytesRead == -1){
return -1;
}
pos += bytesRead;
count(bytesRead);
current.bytesReadFromStream += bytesRead;
return bytesRead;
}
@Override
public long skip(final long n) throws IOException{
final long toSkip = max >= 0 ? Math.min(n, max - pos) : n;
final long skippedBytes = IOUtils.skip(in, toSkip);
pos += skippedBytes;
return skippedBytes;
}
@Override
public int available() throws IOException{
if (max >= 0 && pos >= max){
return 0;
}
return in.available();
}
}
}
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