author | lana |
Mon, 07 Jun 2010 17:08:26 -0700 | |
changeset 5631 | cfb4f43485f3 |
parent 5506 | 202f599c92aa |
child 9526 | a80328f995f1 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
5506 | 2 |
* Copyright (c) 1996, 2009, Oracle and/or its affiliates. All rights reserved. |
2 | 3 |
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 |
* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
|
5506 | 7 |
* published by the Free Software Foundation. Oracle designates this |
2 | 8 |
* particular file as subject to the "Classpath" exception as provided |
5506 | 9 |
* by Oracle in the LICENSE file that accompanied this code. |
2 | 10 |
* |
11 |
* This code is distributed in the hope that it will be useful, but WITHOUT |
|
12 |
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
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* version 2 for more details (a copy is included in the LICENSE file that |
|
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* accompanied this code). |
|
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* |
|
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* You should have received a copy of the GNU General Public License version |
|
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* 2 along with this work; if not, write to the Free Software Foundation, |
|
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
|
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* |
|
5506 | 21 |
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
22 |
* or visit www.oracle.com if you need additional information or have any |
|
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* questions. |
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2 | 24 |
*/ |
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package java.util.zip; |
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import java.io.InputStream; |
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import java.io.IOException; |
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import java.io.EOFException; |
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import java.io.PushbackInputStream; |
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import java.nio.charset.Charset; |
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import static java.util.zip.ZipConstants64.*; |
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/** |
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* This class implements an input stream filter for reading files in the |
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* ZIP file format. Includes support for both compressed and uncompressed |
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* entries. |
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* |
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* @author David Connelly |
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*/ |
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public |
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43 |
class ZipInputStream extends InflaterInputStream implements ZipConstants { |
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private ZipEntry entry; |
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45 |
private int flag; |
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46 |
private CRC32 crc = new CRC32(); |
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47 |
private long remaining; |
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48 |
private byte[] tmpbuf = new byte[512]; |
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50 |
private static final int STORED = ZipEntry.STORED; |
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private static final int DEFLATED = ZipEntry.DEFLATED; |
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53 |
private boolean closed = false; |
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// this flag is set to true after EOF has reached for |
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// one entry |
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private boolean entryEOF = false; |
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private ZipCoder zc; |
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/** |
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* Check to make sure that this stream has not been closed |
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*/ |
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private void ensureOpen() throws IOException { |
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64 |
if (closed) { |
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65 |
throw new IOException("Stream closed"); |
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66 |
} |
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} |
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69 |
/** |
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* Creates a new ZIP input stream. |
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* |
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* <p>The UTF-8 {@link java.nio.charset.Charset charset} is used to |
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* decode the entry names. |
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* |
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* @param in the actual input stream |
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*/ |
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public ZipInputStream(InputStream in) { |
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this(in, Charset.forName("UTF-8")); |
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} |
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/** |
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* Creates a new ZIP input stream. |
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* |
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* @param in the actual input stream |
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* |
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* @param charset |
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* The {@linkplain java.nio.charset.Charset charset} to be |
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* used to decode the ZIP entry name (ignored if the |
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* <a href="package-summary.html#lang_encoding"> language |
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* encoding bit</a> of the ZIP entry's general purpose bit |
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* flag is set). |
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* |
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* @since 1.7 |
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*/ |
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public ZipInputStream(InputStream in, Charset charset) { |
2 | 96 |
super(new PushbackInputStream(in, 512), new Inflater(true), 512); |
97 |
usesDefaultInflater = true; |
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98 |
if(in == null) { |
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99 |
throw new NullPointerException("in is null"); |
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100 |
} |
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if (charset == null) |
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throw new NullPointerException("charset is null"); |
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this.zc = ZipCoder.get(charset); |
2 | 104 |
} |
105 |
||
106 |
/** |
|
107 |
* Reads the next ZIP file entry and positions the stream at the |
|
108 |
* beginning of the entry data. |
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109 |
* @return the next ZIP file entry, or null if there are no more entries |
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110 |
* @exception ZipException if a ZIP file error has occurred |
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111 |
* @exception IOException if an I/O error has occurred |
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*/ |
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113 |
public ZipEntry getNextEntry() throws IOException { |
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114 |
ensureOpen(); |
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115 |
if (entry != null) { |
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116 |
closeEntry(); |
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117 |
} |
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118 |
crc.reset(); |
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119 |
inf.reset(); |
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120 |
if ((entry = readLOC()) == null) { |
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return null; |
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122 |
} |
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123 |
if (entry.method == STORED) { |
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124 |
remaining = entry.size; |
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125 |
} |
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126 |
entryEOF = false; |
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127 |
return entry; |
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128 |
} |
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||
130 |
/** |
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131 |
* Closes the current ZIP entry and positions the stream for reading the |
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* next entry. |
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133 |
* @exception ZipException if a ZIP file error has occurred |
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* @exception IOException if an I/O error has occurred |
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135 |
*/ |
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136 |
public void closeEntry() throws IOException { |
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137 |
ensureOpen(); |
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138 |
while (read(tmpbuf, 0, tmpbuf.length) != -1) ; |
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139 |
entryEOF = true; |
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140 |
} |
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||
142 |
/** |
|
143 |
* Returns 0 after EOF has reached for the current entry data, |
|
144 |
* otherwise always return 1. |
|
145 |
* <p> |
|
146 |
* Programs should not count on this method to return the actual number |
|
147 |
* of bytes that could be read without blocking. |
|
148 |
* |
|
149 |
* @return 1 before EOF and 0 after EOF has reached for current entry. |
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* @exception IOException if an I/O error occurs. |
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* |
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152 |
*/ |
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153 |
public int available() throws IOException { |
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154 |
ensureOpen(); |
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155 |
if (entryEOF) { |
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return 0; |
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157 |
} else { |
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158 |
return 1; |
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159 |
} |
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160 |
} |
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162 |
/** |
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163 |
* Reads from the current ZIP entry into an array of bytes. |
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* If <code>len</code> is not zero, the method |
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* blocks until some input is available; otherwise, no |
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* bytes are read and <code>0</code> is returned. |
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* @param b the buffer into which the data is read |
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168 |
* @param off the start offset in the destination array <code>b</code> |
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* @param len the maximum number of bytes read |
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* @return the actual number of bytes read, or -1 if the end of the |
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* entry is reached |
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* @exception NullPointerException if <code>b</code> is <code>null</code>. |
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* @exception IndexOutOfBoundsException if <code>off</code> is negative, |
2 | 174 |
* <code>len</code> is negative, or <code>len</code> is greater than |
175 |
* <code>b.length - off</code> |
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176 |
* @exception ZipException if a ZIP file error has occurred |
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177 |
* @exception IOException if an I/O error has occurred |
|
178 |
*/ |
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179 |
public int read(byte[] b, int off, int len) throws IOException { |
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180 |
ensureOpen(); |
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181 |
if (off < 0 || len < 0 || off > b.length - len) { |
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182 |
throw new IndexOutOfBoundsException(); |
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183 |
} else if (len == 0) { |
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return 0; |
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185 |
} |
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||
187 |
if (entry == null) { |
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188 |
return -1; |
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189 |
} |
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190 |
switch (entry.method) { |
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191 |
case DEFLATED: |
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192 |
len = super.read(b, off, len); |
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193 |
if (len == -1) { |
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194 |
readEnd(entry); |
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195 |
entryEOF = true; |
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196 |
entry = null; |
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197 |
} else { |
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198 |
crc.update(b, off, len); |
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199 |
} |
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return len; |
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case STORED: |
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if (remaining <= 0) { |
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203 |
entryEOF = true; |
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entry = null; |
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205 |
return -1; |
|
206 |
} |
|
207 |
if (len > remaining) { |
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208 |
len = (int)remaining; |
|
209 |
} |
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210 |
len = in.read(b, off, len); |
|
211 |
if (len == -1) { |
|
212 |
throw new ZipException("unexpected EOF"); |
|
213 |
} |
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214 |
crc.update(b, off, len); |
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215 |
remaining -= len; |
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216 |
if (remaining == 0 && entry.crc != crc.getValue()) { |
|
217 |
throw new ZipException( |
|
218 |
"invalid entry CRC (expected 0x" + Long.toHexString(entry.crc) + |
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219 |
" but got 0x" + Long.toHexString(crc.getValue()) + ")"); |
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220 |
} |
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221 |
return len; |
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default: |
|
223 |
throw new ZipException("invalid compression method"); |
|
224 |
} |
|
225 |
} |
|
226 |
||
227 |
/** |
|
228 |
* Skips specified number of bytes in the current ZIP entry. |
|
229 |
* @param n the number of bytes to skip |
|
230 |
* @return the actual number of bytes skipped |
|
231 |
* @exception ZipException if a ZIP file error has occurred |
|
232 |
* @exception IOException if an I/O error has occurred |
|
233 |
* @exception IllegalArgumentException if n < 0 |
|
234 |
*/ |
|
235 |
public long skip(long n) throws IOException { |
|
236 |
if (n < 0) { |
|
237 |
throw new IllegalArgumentException("negative skip length"); |
|
238 |
} |
|
239 |
ensureOpen(); |
|
240 |
int max = (int)Math.min(n, Integer.MAX_VALUE); |
|
241 |
int total = 0; |
|
242 |
while (total < max) { |
|
243 |
int len = max - total; |
|
244 |
if (len > tmpbuf.length) { |
|
245 |
len = tmpbuf.length; |
|
246 |
} |
|
247 |
len = read(tmpbuf, 0, len); |
|
248 |
if (len == -1) { |
|
249 |
entryEOF = true; |
|
250 |
break; |
|
251 |
} |
|
252 |
total += len; |
|
253 |
} |
|
254 |
return total; |
|
255 |
} |
|
256 |
||
257 |
/** |
|
258 |
* Closes this input stream and releases any system resources associated |
|
259 |
* with the stream. |
|
260 |
* @exception IOException if an I/O error has occurred |
|
261 |
*/ |
|
262 |
public void close() throws IOException { |
|
263 |
if (!closed) { |
|
264 |
super.close(); |
|
265 |
closed = true; |
|
266 |
} |
|
267 |
} |
|
268 |
||
269 |
private byte[] b = new byte[256]; |
|
270 |
||
271 |
/* |
|
272 |
* Reads local file (LOC) header for next entry. |
|
273 |
*/ |
|
274 |
private ZipEntry readLOC() throws IOException { |
|
275 |
try { |
|
276 |
readFully(tmpbuf, 0, LOCHDR); |
|
277 |
} catch (EOFException e) { |
|
278 |
return null; |
|
279 |
} |
|
280 |
if (get32(tmpbuf, 0) != LOCSIG) { |
|
281 |
return null; |
|
282 |
} |
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// get flag first, we need check EFS. |
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284 |
flag = get16(tmpbuf, LOCFLG); |
2 | 285 |
// get the entry name and create the ZipEntry first |
286 |
int len = get16(tmpbuf, LOCNAM); |
|
287 |
int blen = b.length; |
|
288 |
if (len > blen) { |
|
289 |
do |
|
290 |
blen = blen * 2; |
|
291 |
while (len > blen); |
|
292 |
b = new byte[blen]; |
|
293 |
} |
|
294 |
readFully(b, 0, len); |
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// Force to use UTF-8 if the EFS bit is ON, even the cs is NOT UTF-8 |
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296 |
ZipEntry e = createZipEntry(((flag & EFS) != 0) |
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297 |
? zc.toStringUTF8(b, len) |
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298 |
: zc.toString(b, len)); |
2 | 299 |
// now get the remaining fields for the entry |
300 |
if ((flag & 1) == 1) { |
|
301 |
throw new ZipException("encrypted ZIP entry not supported"); |
|
302 |
} |
|
303 |
e.method = get16(tmpbuf, LOCHOW); |
|
304 |
e.time = get32(tmpbuf, LOCTIM); |
|
305 |
if ((flag & 8) == 8) { |
|
306 |
/* "Data Descriptor" present */ |
|
307 |
if (e.method != DEFLATED) { |
|
308 |
throw new ZipException( |
|
309 |
"only DEFLATED entries can have EXT descriptor"); |
|
310 |
} |
|
311 |
} else { |
|
312 |
e.crc = get32(tmpbuf, LOCCRC); |
|
313 |
e.csize = get32(tmpbuf, LOCSIZ); |
|
314 |
e.size = get32(tmpbuf, LOCLEN); |
|
315 |
} |
|
316 |
len = get16(tmpbuf, LOCEXT); |
|
317 |
if (len > 0) { |
|
318 |
byte[] bb = new byte[len]; |
|
319 |
readFully(bb, 0, len); |
|
320 |
e.setExtra(bb); |
|
2438 | 321 |
// extra fields are in "HeaderID(2)DataSize(2)Data... format |
322 |
if (e.csize == ZIP64_MAGICVAL || e.size == ZIP64_MAGICVAL) { |
|
323 |
int off = 0; |
|
324 |
while (off + 4 < len) { |
|
325 |
int sz = get16(bb, off + 2); |
|
326 |
if (get16(bb, off) == ZIP64_EXTID) { |
|
327 |
off += 4; |
|
328 |
// LOC extra zip64 entry MUST include BOTH original and |
|
329 |
// compressed file size fields |
|
330 |
if (sz < 16 || (off + sz) > len ) { |
|
331 |
// Invalid zip64 extra fields, simply skip. Even it's |
|
332 |
// rare, it's possible the entry size happens to be |
|
333 |
// the magic value and it "accidnetly" has some bytes |
|
334 |
// in extra match the id. |
|
335 |
return e; |
|
336 |
} |
|
337 |
e.size = get64(bb, off); |
|
338 |
e.csize = get64(bb, off + 8); |
|
339 |
break; |
|
340 |
} |
|
341 |
off += (sz + 4); |
|
342 |
} |
|
343 |
} |
|
2 | 344 |
} |
345 |
return e; |
|
346 |
} |
|
347 |
||
348 |
/** |
|
349 |
* Creates a new <code>ZipEntry</code> object for the specified |
|
350 |
* entry name. |
|
351 |
* |
|
352 |
* @param name the ZIP file entry name |
|
353 |
* @return the ZipEntry just created |
|
354 |
*/ |
|
355 |
protected ZipEntry createZipEntry(String name) { |
|
356 |
return new ZipEntry(name); |
|
357 |
} |
|
358 |
||
359 |
/* |
|
360 |
* Reads end of deflated entry as well as EXT descriptor if present. |
|
361 |
*/ |
|
362 |
private void readEnd(ZipEntry e) throws IOException { |
|
363 |
int n = inf.getRemaining(); |
|
364 |
if (n > 0) { |
|
365 |
((PushbackInputStream)in).unread(buf, len - n, n); |
|
366 |
} |
|
367 |
if ((flag & 8) == 8) { |
|
368 |
/* "Data Descriptor" present */ |
|
2438 | 369 |
if (inf.getBytesWritten() > ZIP64_MAGICVAL || |
370 |
inf.getBytesRead() > ZIP64_MAGICVAL) { |
|
371 |
// ZIP64 format |
|
372 |
readFully(tmpbuf, 0, ZIP64_EXTHDR); |
|
373 |
long sig = get32(tmpbuf, 0); |
|
374 |
if (sig != EXTSIG) { // no EXTSIG present |
|
375 |
e.crc = sig; |
|
376 |
e.csize = get64(tmpbuf, ZIP64_EXTSIZ - ZIP64_EXTCRC); |
|
377 |
e.size = get64(tmpbuf, ZIP64_EXTLEN - ZIP64_EXTCRC); |
|
378 |
((PushbackInputStream)in).unread( |
|
379 |
tmpbuf, ZIP64_EXTHDR - ZIP64_EXTCRC - 1, ZIP64_EXTCRC); |
|
380 |
} else { |
|
381 |
e.crc = get32(tmpbuf, ZIP64_EXTCRC); |
|
382 |
e.csize = get64(tmpbuf, ZIP64_EXTSIZ); |
|
383 |
e.size = get64(tmpbuf, ZIP64_EXTLEN); |
|
384 |
} |
|
2 | 385 |
} else { |
2438 | 386 |
readFully(tmpbuf, 0, EXTHDR); |
387 |
long sig = get32(tmpbuf, 0); |
|
388 |
if (sig != EXTSIG) { // no EXTSIG present |
|
389 |
e.crc = sig; |
|
390 |
e.csize = get32(tmpbuf, EXTSIZ - EXTCRC); |
|
391 |
e.size = get32(tmpbuf, EXTLEN - EXTCRC); |
|
392 |
((PushbackInputStream)in).unread( |
|
393 |
tmpbuf, EXTHDR - EXTCRC - 1, EXTCRC); |
|
394 |
} else { |
|
395 |
e.crc = get32(tmpbuf, EXTCRC); |
|
396 |
e.csize = get32(tmpbuf, EXTSIZ); |
|
397 |
e.size = get32(tmpbuf, EXTLEN); |
|
398 |
} |
|
2 | 399 |
} |
400 |
} |
|
401 |
if (e.size != inf.getBytesWritten()) { |
|
402 |
throw new ZipException( |
|
403 |
"invalid entry size (expected " + e.size + |
|
404 |
" but got " + inf.getBytesWritten() + " bytes)"); |
|
405 |
} |
|
406 |
if (e.csize != inf.getBytesRead()) { |
|
407 |
throw new ZipException( |
|
408 |
"invalid entry compressed size (expected " + e.csize + |
|
409 |
" but got " + inf.getBytesRead() + " bytes)"); |
|
410 |
} |
|
411 |
if (e.crc != crc.getValue()) { |
|
412 |
throw new ZipException( |
|
413 |
"invalid entry CRC (expected 0x" + Long.toHexString(e.crc) + |
|
414 |
" but got 0x" + Long.toHexString(crc.getValue()) + ")"); |
|
415 |
} |
|
416 |
} |
|
417 |
||
418 |
/* |
|
419 |
* Reads bytes, blocking until all bytes are read. |
|
420 |
*/ |
|
421 |
private void readFully(byte[] b, int off, int len) throws IOException { |
|
422 |
while (len > 0) { |
|
423 |
int n = in.read(b, off, len); |
|
424 |
if (n == -1) { |
|
425 |
throw new EOFException(); |
|
426 |
} |
|
427 |
off += n; |
|
428 |
len -= n; |
|
429 |
} |
|
430 |
} |
|
431 |
||
432 |
/* |
|
433 |
* Fetches unsigned 16-bit value from byte array at specified offset. |
|
434 |
* The bytes are assumed to be in Intel (little-endian) byte order. |
|
435 |
*/ |
|
436 |
private static final int get16(byte b[], int off) { |
|
437 |
return (b[off] & 0xff) | ((b[off+1] & 0xff) << 8); |
|
438 |
} |
|
439 |
||
440 |
/* |
|
441 |
* Fetches unsigned 32-bit value from byte array at specified offset. |
|
442 |
* The bytes are assumed to be in Intel (little-endian) byte order. |
|
443 |
*/ |
|
444 |
private static final long get32(byte b[], int off) { |
|
2438 | 445 |
return (get16(b, off) | ((long)get16(b, off+2) << 16)) & 0xffffffffL; |
446 |
} |
|
447 |
||
448 |
/* |
|
449 |
* Fetches signed 64-bit value from byte array at specified offset. |
|
450 |
* The bytes are assumed to be in Intel (little-endian) byte order. |
|
451 |
*/ |
|
452 |
private static final long get64(byte b[], int off) { |
|
453 |
return get32(b, off) | (get32(b, off+4) << 32); |
|
2 | 454 |
} |
455 |
} |