| 1: | // ZipFile.cs | |
| 2: | // Copyright (C) 2001 Mike Krueger | |
| 3: | // | |
| 4: | // This file was translated from java, it was part of the GNU Classpath | |
| 5: | // Copyright (C) 2001 Free Software Foundation, Inc. | |
| 6: | // | |
| 7: | // This program is free software; you can redistribute it and/or | |
| 8: | // modify it under the terms of the GNU General Public License | |
| 9: | // as published by the Free Software Foundation; either version 2 | |
| 10: | // of the License, or (at your option) any later version. | |
| 11: | // | |
| 12: | // This program is distributed in the hope that it will be useful, | |
| 13: | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14: | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15: | // GNU General Public License for more details. | |
| 16: | // | |
| 17: | // You should have received a copy of the GNU General Public License | |
| 18: | // along with this program; if not, write to the Free Software | |
| 19: | // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
| 20: | // | |
| 21: | // Linking this library statically or dynamically with other modules is | |
| 22: | // making a combined work based on this library. Thus, the terms and | |
| 23: | // conditions of the GNU General Public License cover the whole | |
| 24: | // combination. | |
| 25: | // | |
| 26: | // As a special exception, the copyright holders of this library give you | |
| 27: | // permission to link this library with independent modules to produce an | |
| 28: | // executable, regardless of the license terms of these independent | |
| 29: | // modules, and to copy and distribute the resulting executable under | |
| 30: | // terms of your choice, provided that you also meet, for each linked | |
| 31: | // independent module, the terms and conditions of the license of that | |
| 32: | // module. An independent module is a module which is not derived from | |
| 33: | // or based on this library. If you modify this library, you may extend | |
| 34: | // this exception to your version of the library, but you are not | |
| 35: | // obligated to do so. If you do not wish to do so, delete this | |
| 36: | // exception statement from your version. | |
| 37: | ||
| 38: | using System; | |
| 39: | using System.Collections; | |
| 40: | using System.IO; | |
| 41: | using System.Text; | |
| 42: | ||
| 43: | using ICSharpCode.SharpZipLib.Zip.Compression.Streams; | |
| 44: | using ICSharpCode.SharpZipLib.Zip.Compression; | |
| 45: | ||
| 46: | namespace ICSharpCode.SharpZipLib.Zip { | |
| 47: | ||
| 48: | /// <summary> | |
| 49: | /// This class represents a Zip archive. You can ask for the contained | |
| 50: | /// entries, or get an input stream for a file entry. The entry is | |
| 51: | /// automatically decompressed. | |
| 52: | /// | |
| 53: | /// This class is thread safe: You can open input streams for arbitrary | |
| 54: | /// entries in different threads. | |
| 55: | /// | |
| 56: | /// author of the original java version : Jochen Hoenicke | |
| 57: | /// </summary> | |
| 58: | /// <example> | |
| 59: | /// using System; | |
| 60: | /// using System.Text; | |
| 61: | /// using System.Collections; | |
| 62: | /// using System.IO; | |
| 63: | /// | |
| 64: | /// using NZlib.Zip; | |
| 65: | /// | |
| 66: | /// class MainClass | |
| 67: | /// { | |
| 68: | /// static public void Main(string[] args) | |
| 69: | /// { | |
| 70: | /// ZipFile zFile = new ZipFile(args[0]); | |
| 71: | /// Console.WriteLine("Listing of : " + zFile.Name); | |
| 72: | /// Console.WriteLine(""); | |
| 73: | /// Console.WriteLine("Raw Size Size Date Time Name"); | |
| 74: | /// Console.WriteLine("-------- -------- -------- ------ ---------"); | |
| 75: | /// foreach (ZipEntry e in zFile) { | |
| 76: | /// DateTime d = e.DateTime; | |
| 77: | /// Console.WriteLine("{0, -10}{1, -10}{2} {3} {4}", e.Size, e.CompressedSize, | |
| 78: | /// d.ToString("dd-MM-yy"), d.ToString("t"), | |
| 79: | /// e.Name); | |
| 80: | /// } | |
| 81: | /// } | |
| 82: | /// } | |
| 83: | /// </example> | |
| 84: | public class ZipFile : IEnumerable | |
| 85: | { | |
| 86: | string name; | |
| 87: | Stream baseStream; | |
| 88: | ZipEntry[] entries; | |
| 89: | ||
| 90: | /// <summary> | |
| 91: | /// Opens a Zip file with the given name for reading. | |
| 92: | /// </summary> | |
| 93: | /// <exception name="System.IO.IOException"> | |
| 94: | /// IOException if a i/o error occured. | |
| 95: | /// </exception> | |
| 96: | /// <exception name="ICSharpCode.SharpZipLib.ZipException"> | |
| 97: | /// if the file doesn't contain a valid zip archive. | |
| 98: | /// </exception> | |
| 99: | public ZipFile(string name) : this(File.OpenRead(name)) | |
| 100: | { | |
| 101: | } | |
| 102: | ||
| 103: | /// <summary> | |
| 104: | /// Opens a Zip file reading the given FileStream | |
| 105: | /// </summary> | |
| 106: | /// <exception name="System.IO.IOException"> | |
| 107: | /// IOException if a i/o error occured. | |
| 108: | /// </exception> | |
| 109: | /// <exception name="ICSharpCode.SharpZipLib.ZipException"> | |
| 110: | /// if the file doesn't contain a valid zip archive. | |
| 111: | /// </exception> | |
| 112: | public ZipFile(FileStream file) | |
| 113: | { | |
| 114: | this.baseStream = file; | |
| 115: | this.name = file.Name; | |
| 116: | ReadEntries(); | |
| 117: | } | |
| 118: | ||
| 119: | /// <summary> | |
| 120: | /// Opens a Zip file reading the given Stream | |
| 121: | /// </summary> | |
| 122: | /// <exception name="System.IO.IOException"> | |
| 123: | /// IOException if a i/o error occured. | |
| 124: | /// </exception> | |
| 125: | /// <exception name="ICSharpCode.SharpZipLib.ZipException"> | |
| 126: | /// if the file doesn't contain a valid zip archive. | |
| 127: | /// </exception> | |
| 128: | public ZipFile(Stream baseStream) | |
| 129: | { | |
| 130: | this.baseStream = baseStream; | |
| 131: | this.name = null; | |
| 132: | ReadEntries(); | |
| 133: | } | |
| 134: | ||
| 135: | ||
| 136: | /// <summary> | |
| 137: | /// Read an unsigned short in little endian byte order. | |
| 138: | /// </summary> | |
| 139: | /// <exception name="System.IO.IOException"> | |
| 140: | /// if a i/o error occured. | |
| 141: | /// </exception> | |
| 142: | /// <exception name="System.IO.EndOfStreamException"> | |
| 143: | /// if the file ends prematurely | |
| 144: | /// </exception> | |
| 145: | int ReadLeShort() | |
| 146: | { | |
| 147: | return baseStream.ReadByte() | baseStream.ReadByte() << 8; | |
| 148: | } | |
| 149: | ||
| 150: | /// <summary> | |
| 151: | /// Read an int in little endian byte order. | |
| 152: | /// </summary> | |
| 153: | /// <exception name="System.IO.IOException"> | |
| 154: | /// if a i/o error occured. | |
| 155: | /// </exception> | |
| 156: | /// <exception name="System.IO.EndOfStreamException"> | |
| 157: | /// if the file ends prematurely | |
| 158: | /// </exception> | |
| 159: | int ReadLeInt() | |
| 160: | { | |
| 161: | return ReadLeShort() | ReadLeShort() << 16; | |
| 162: | } | |
| 163: | ||
| 164: | /// <summary> | |
| 165: | /// Read the central directory of a zip file and fill the entries | |
| 166: | /// array. This is called exactly once by the constructors. | |
| 167: | /// </summary> | |
| 168: | /// <exception name="System.IO.IOException"> | |
| 169: | /// if a i/o error occured. | |
| 170: | /// </exception> | |
| 171: | /// <exception name="ICSharpCode.SharpZipLib.ZipException"> | |
| 172: | /// if the central directory is malformed | |
| 173: | /// </exception> | |
| 174: | void ReadEntries() | |
| 175: | { | |
| 176: | /* Search for the End Of Central Directory. When a zip comment is | |
| 177: | * present the directory may start earlier. | |
| 178: | * FIXME: This searches the whole file in a very slow manner if the | |
| 179: | * file isn't a zip file. | |
| 180: | */ | |
| 181: | long pos = baseStream.Length - ZipConstants.ENDHDR; | |
| 182: | do { | |
| 183: | if (pos < 0) { | |
| 184: | throw new ZipException("central directory not found, probably not a zip file"); | |
| 185: | } | |
| 186: | baseStream.Seek(pos--, SeekOrigin.Begin); | |
| 187: | } while (ReadLeInt() != ZipConstants.ENDSIG); | |
| 188: | ||
| 189: | long oldPos = baseStream.Position; | |
| 190: | baseStream.Position += ZipConstants.ENDTOT - ZipConstants.ENDNRD; | |
| 191: | ||
| 192: | if (baseStream.Position - oldPos != ZipConstants.ENDTOT - ZipConstants.ENDNRD) { | |
| 193: | throw new EndOfStreamException(); | |
| 194: | } | |
| 195: | int count = ReadLeShort(); | |
| 196: | ||
| 197: | oldPos = baseStream.Position; | |
| 198: | baseStream.Position += ZipConstants.ENDOFF - ZipConstants.ENDSIZ; | |
| 199: | ||
| 200: | if (baseStream.Position - oldPos != ZipConstants.ENDOFF - ZipConstants.ENDSIZ) { | |
| 201: | throw new EndOfStreamException(); | |
| 202: | } | |
| 203: | ||
| 204: | int centralOffset = ReadLeInt(); | |
| 205: | ||
| 206: | entries = new ZipEntry[count]; | |
| 207: | baseStream.Seek(centralOffset, SeekOrigin.Begin); | |
| 208: | for (int i = 0; i < count; i++) { | |
| 209: | if (ReadLeInt() != ZipConstants.CENSIG) { | |
| 210: | throw new ZipException("Wrong Central Directory signature"); | |
| 211: | } | |
| 212: | ||
| 213: | oldPos = baseStream.Position; | |
| 214: | baseStream.Position += ZipConstants.CENHOW - ZipConstants.CENVEM; | |
| 215: | ||
| 216: | if (baseStream.Position - oldPos != ZipConstants.CENHOW - ZipConstants.CENVEM) { | |
| 217: | throw new EndOfStreamException(); | |
| 218: | } | |
| 219: | int method = ReadLeShort(); | |
| 220: | int dostime = ReadLeInt(); | |
| 221: | int crc = ReadLeInt(); | |
| 222: | int csize = ReadLeInt(); | |
| 223: | int size = ReadLeInt(); | |
| 224: | int nameLen = ReadLeShort(); | |
| 225: | int extraLen = ReadLeShort(); | |
| 226: | int commentLen = ReadLeShort(); | |
| 227: | ||
| 228: | oldPos = baseStream.Position; | |
| 229: | baseStream.Position += ZipConstants.CENOFF - ZipConstants.CENDSK; | |
| 230: | if (baseStream.Position - oldPos != ZipConstants.CENOFF - ZipConstants.CENDSK) { | |
| 231: | throw new EndOfStreamException(); | |
| 232: | } | |
| 233: | int offset = ReadLeInt(); | |
| 234: | ||
| 235: | byte[] buffer = new byte[Math.Max(nameLen, commentLen)]; | |
| 236: | ||
| 237: | baseStream.Read(buffer, 0, nameLen); | |
| 238: | string name = ZipConstants.ConvertToString(buffer); | |
| 239: | ||
| 240: | ZipEntry entry = new ZipEntry(name); | |
| 241: | entry.CompressionMethod = (CompressionMethod)method; | |
| 242: | entry.Crc = crc & 0xffffffffL; | |
| 243: | entry.Size = size & 0xffffffffL; | |
| 244: | entry.CompressedSize = csize & 0xffffffffL; | |
| 245: | entry.DosTime = dostime; | |
| 246: | if (extraLen > 0) { | |
| 247: | byte[] extra = new byte[extraLen]; | |
| 248: | baseStream.Read(extra, 0, extraLen); | |
| 249: | entry.ExtraData = extra; | |
| 250: | } | |
| 251: | if (commentLen > 0) { | |
| 252: | baseStream.Read(buffer, 0, commentLen); | |
| 253: | entry.Comment = ZipConstants.ConvertToString(buffer); | |
| 254: | } | |
| 255: | entry.zipFileIndex = i; | |
| 256: | entry.offset = offset; | |
| 257: | entries[i] = entry; | |
| 258: | } | |
| 259: | } | |
| 260: | ||
| 261: | /// <summary> | |
| 262: | /// Closes the ZipFile. This also closes all input streams given by | |
| 263: | /// this class. After this is called, no further method should be | |
| 264: | /// called. | |
| 265: | /// </summary> | |
| 266: | /// <exception name="System.IO.IOException"> | |
| 267: | /// if a i/o error occured. | |
| 268: | /// </exception> | |
| 269: | public void Close() | |
| 270: | { | |
| 271: | entries = null; | |
| 272: | lock(baseStream) { | |
| 273: | baseStream.Close(); | |
| 274: | } | |
| 275: | } | |
| 276: | ||
| 277: | /// <summary> | |
| 278: | /// Returns an IEnumerator of all Zip entries in this Zip file. | |
| 279: | /// </summary> | |
| 280: | public IEnumerator GetEnumerator() | |
| 281: | { | |
| 282: | if (entries == null) { | |
| 283: | throw new InvalidOperationException("ZipFile has closed"); | |
| 284: | } | |
| 285: | ||
| 286: | return new ZipEntryEnumeration(entries); | |
| 287: | } | |
| 288: | ||
| 289: | int GetEntryIndex(string name) | |
| 290: | { | |
| 291: | for (int i = 0; i < entries.Length; i++) { | |
| 292: | if (name.Equals(entries[i].Name)) { | |
| 293: | return i; | |
| 294: | } | |
| 295: | } | |
| 296: | return -1; | |
| 297: | } | |
| 298: | ||
| 299: | /// <summary> | |
| 300: | /// Searches for a zip entry in this archive with the given name. | |
| 301: | /// </summary> | |
| 302: | /// <param name="name"> | |
| 303: | /// the name. May contain directory components separated by slashes ('/'). | |
| 304: | /// </param> | |
| 305: | /// <returns> | |
| 306: | /// the zip entry, or null if no entry with that name exists. | |
| 307: | /// </returns> | |
| 308: | public ZipEntry GetEntry(string name) | |
| 309: | { | |
| 310: | if (entries == null) { | |
| 311: | throw new InvalidOperationException("ZipFile has closed"); | |
| 312: | } | |
| 313: | int index = GetEntryIndex(name); | |
| 314: | return index >= 0 ? (ZipEntry) entries[index].Clone() : null; | |
| 315: | } | |
| 316: | ||
| 317: | /// <summary> | |
| 318: | /// Checks, if the local header of the entry at index i matches the | |
| 319: | /// central directory, and returns the offset to the data. | |
| 320: | /// </summary> | |
| 321: | /// <returns> | |
| 322: | /// the start offset of the (compressed) data. | |
| 323: | /// </returns> | |
| 324: | /// <exception name="System.IO.IOException"> | |
| 325: | /// if a i/o error occured. | |
| 326: | /// </exception> | |
| 327: | /// <exception name="ICSharpCode.SharpZipLib.ZipException"> | |
| 328: | /// if the local header doesn't match the central directory header | |
| 329: | /// </exception> | |
| 330: | long CheckLocalHeader(ZipEntry entry) | |
| 331: | { | |
| 332: | lock(baseStream) { | |
| 333: | baseStream.Seek(entry.offset, SeekOrigin.Begin); | |
| 334: | if (ReadLeInt() != ZipConstants.LOCSIG) { | |
| 335: | throw new ZipException("Wrong Local header signature"); | |
| 336: | } | |
| 337: | ||
| 338: | /* skip version and flags */ | |
| 339: | long oldPos = baseStream.Position; | |
| 340: | baseStream.Position += ZipConstants.LOCHOW - ZipConstants.LOCVER; | |
| 341: | if (baseStream.Position - oldPos != ZipConstants.LOCHOW - ZipConstants.LOCVER) { | |
| 342: | throw new EndOfStreamException(); | |
| 343: | } | |
| 344: | ||
| 345: | if (entry.CompressionMethod != (CompressionMethod)ReadLeShort()) { | |
| 346: | throw new ZipException("Compression method mismatch"); | |
| 347: | } | |
| 348: | ||
| 349: | /* Skip time, crc, size and csize */ | |
| 350: | oldPos = baseStream.Position; | |
| 351: | baseStream.Position += ZipConstants.LOCNAM - ZipConstants.LOCTIM; | |
| 352: | ||
| 353: | if (baseStream.Position - oldPos != ZipConstants.LOCNAM - ZipConstants.LOCTIM) { | |
| 354: | throw new EndOfStreamException(); | |
| 355: | } | |
| 356: | ||
| 357: | if (entry.Name.Length != ReadLeShort()) { | |
| 358: | throw new ZipException("file name length mismatch"); | |
| 359: | } | |
| 360: | ||
| 361: | int extraLen = entry.Name.Length + ReadLeShort(); | |
| 362: | return entry.offset + ZipConstants.LOCHDR + extraLen; | |
| 363: | } | |
| 364: | } | |
| 365: | ||
| 366: | /// <summary> | |
| 367: | /// Creates an input stream reading the given zip entry as | |
| 368: | /// uncompressed data. Normally zip entry should be an entry | |
| 369: | /// returned by GetEntry(). | |
| 370: | /// </summary> | |
| 371: | /// <returns> | |
| 372: | /// the input stream. | |
| 373: | /// </returns> | |
| 374: | /// <exception name="System.IO.IOException"> | |
| 375: | /// if a i/o error occured. | |
| 376: | /// </exception> | |
| 377: | /// <exception name="ICSharpCode.SharpZipLib.ZipException"> | |
| 378: | /// if the Zip archive is malformed. | |
| 379: | /// </exception> | |
| 380: | public Stream GetInputStream(ZipEntry entry) | |
| 381: |