| | 1 | | using System; |
| | 2 | | using System.IO; |
| | 3 | | using System.Text; |
| | 4 | |
|
| | 5 | | namespace ICSharpCode.SharpZipLib.Zip |
| | 6 | | { |
| | 7 | | /// <summary> |
| | 8 | | /// Holds data pertinent to a data descriptor. |
| | 9 | | /// </summary> |
| | 10 | | public class DescriptorData |
| | 11 | | { |
| | 12 | | /// <summary> |
| | 13 | | /// Get /set the compressed size of data. |
| | 14 | | /// </summary> |
| | 15 | | public long CompressedSize { |
| 13 | 16 | | get { return compressedSize; } |
| 26 | 17 | | set { compressedSize = value; } |
| | 18 | | } |
| | 19 | |
|
| | 20 | | /// <summary> |
| | 21 | | /// Get / set the uncompressed size of data |
| | 22 | | /// </summary> |
| | 23 | | public long Size { |
| 13 | 24 | | get { return size; } |
| 26 | 25 | | set { size = value; } |
| | 26 | | } |
| | 27 | |
|
| | 28 | | /// <summary> |
| | 29 | | /// Get /set the crc value. |
| | 30 | | /// </summary> |
| | 31 | | public long Crc { |
| 13 | 32 | | get { return crc; } |
| 26 | 33 | | set { crc = (value & 0xffffffff); } |
| | 34 | | } |
| | 35 | |
|
| | 36 | | #region Instance Fields |
| | 37 | | long size; |
| | 38 | | long compressedSize; |
| | 39 | | long crc; |
| | 40 | | #endregion |
| | 41 | | } |
| | 42 | |
|
| | 43 | | class EntryPatchData |
| | 44 | | { |
| | 45 | | public long SizePatchOffset { |
| | 46 | | get { return sizePatchOffset_; } |
| | 47 | | set { sizePatchOffset_ = value; } |
| | 48 | | } |
| | 49 | |
|
| | 50 | | public long CrcPatchOffset { |
| | 51 | | get { return crcPatchOffset_; } |
| | 52 | | set { crcPatchOffset_ = value; } |
| | 53 | | } |
| | 54 | |
|
| | 55 | | #region Instance Fields |
| | 56 | | long sizePatchOffset_; |
| | 57 | | long crcPatchOffset_; |
| | 58 | | #endregion |
| | 59 | | } |
| | 60 | |
|
| | 61 | | /// <summary> |
| | 62 | | /// This class assists with writing/reading from Zip files. |
| | 63 | | /// </summary> |
| | 64 | | internal class ZipHelperStream : Stream |
| | 65 | | { |
| | 66 | | #region Constructors |
| | 67 | | /// <summary> |
| | 68 | | /// Initialise an instance of this class. |
| | 69 | | /// </summary> |
| | 70 | | /// <param name="name">The name of the file to open.</param> |
| | 71 | | public ZipHelperStream(string name) |
| | 72 | | { |
| | 73 | | stream_ = new FileStream(name, FileMode.Open, FileAccess.ReadWrite); |
| | 74 | | isOwner_ = true; |
| | 75 | | } |
| | 76 | |
|
| | 77 | | /// <summary> |
| | 78 | | /// Initialise a new instance of <see cref="ZipHelperStream"/>. |
| | 79 | | /// </summary> |
| | 80 | | /// <param name="stream">The stream to use.</param> |
| | 81 | | public ZipHelperStream(Stream stream) |
| | 82 | | { |
| | 83 | | stream_ = stream; |
| | 84 | | } |
| | 85 | | #endregion |
| | 86 | |
|
| | 87 | | /// <summary> |
| | 88 | | /// Get / set a value indicating wether the the underlying stream is owned or not. |
| | 89 | | /// </summary> |
| | 90 | | /// <remarks>If the stream is owned it is closed when this instance is closed.</remarks> |
| | 91 | | public bool IsStreamOwner { |
| | 92 | | get { return isOwner_; } |
| | 93 | | set { isOwner_ = value; } |
| | 94 | | } |
| | 95 | |
|
| | 96 | | #region Base Stream Methods |
| | 97 | | public override bool CanRead { |
| | 98 | | get { return stream_.CanRead; } |
| | 99 | | } |
| | 100 | |
|
| | 101 | | public override bool CanSeek { |
| | 102 | | get { return stream_.CanSeek; } |
| | 103 | | } |
| | 104 | |
|
| | 105 | | public override bool CanTimeout { |
| | 106 | | get { return stream_.CanTimeout; } |
| | 107 | | } |
| | 108 | |
|
| | 109 | | public override long Length { |
| | 110 | | get { return stream_.Length; } |
| | 111 | | } |
| | 112 | |
|
| | 113 | | public override long Position { |
| | 114 | | get { return stream_.Position; } |
| | 115 | | set { stream_.Position = value; } |
| | 116 | | } |
| | 117 | |
|
| | 118 | | public override bool CanWrite { |
| | 119 | | get { return stream_.CanWrite; } |
| | 120 | | } |
| | 121 | |
|
| | 122 | | public override void Flush() |
| | 123 | | { |
| | 124 | | stream_.Flush(); |
| | 125 | | } |
| | 126 | |
|
| | 127 | | public override long Seek(long offset, SeekOrigin origin) |
| | 128 | | { |
| | 129 | | return stream_.Seek(offset, origin); |
| | 130 | | } |
| | 131 | |
|
| | 132 | | public override void SetLength(long value) |
| | 133 | | { |
| | 134 | | stream_.SetLength(value); |
| | 135 | | } |
| | 136 | |
|
| | 137 | | public override int Read(byte[] buffer, int offset, int count) |
| | 138 | | { |
| | 139 | | return stream_.Read(buffer, offset, count); |
| | 140 | | } |
| | 141 | |
|
| | 142 | | public override void Write(byte[] buffer, int offset, int count) |
| | 143 | | { |
| | 144 | | stream_.Write(buffer, offset, count); |
| | 145 | | } |
| | 146 | |
|
| | 147 | | /// <summary> |
| | 148 | | /// Close the stream. |
| | 149 | | /// </summary> |
| | 150 | | /// <remarks> |
| | 151 | | /// The underlying stream is closed only if <see cref="IsStreamOwner"/> is true. |
| | 152 | | /// </remarks> |
| | 153 | | override public void Close() |
| | 154 | | { |
| | 155 | | Stream toClose = stream_; |
| | 156 | | stream_ = null; |
| | 157 | | if (isOwner_ && (toClose != null)) { |
| | 158 | | isOwner_ = false; |
| | 159 | | toClose.Close(); |
| | 160 | | } |
| | 161 | | } |
| | 162 | | #endregion |
| | 163 | |
|
| | 164 | | // Write the local file header |
| | 165 | | // TODO: ZipHelperStream.WriteLocalHeader is not yet used and needs checking for ZipFile and ZipOuptutStream usage |
| | 166 | | void WriteLocalHeader(ZipEntry entry, EntryPatchData patchData) |
| | 167 | | { |
| | 168 | | CompressionMethod method = entry.CompressionMethod; |
| | 169 | | bool headerInfoAvailable = true; // How to get this? |
| | 170 | | bool patchEntryHeader = false; |
| | 171 | |
|
| | 172 | | WriteLEInt(ZipConstants.LocalHeaderSignature); |
| | 173 | |
|
| | 174 | | WriteLEShort(entry.Version); |
| | 175 | | WriteLEShort(entry.Flags); |
| | 176 | | WriteLEShort((byte)method); |
| | 177 | | WriteLEInt((int)entry.DosTime); |
| | 178 | |
|
| | 179 | | if (headerInfoAvailable == true) { |
| | 180 | | WriteLEInt((int)entry.Crc); |
| | 181 | | if (entry.LocalHeaderRequiresZip64) { |
| | 182 | | WriteLEInt(-1); |
| | 183 | | WriteLEInt(-1); |
| | 184 | | } else { |
| | 185 | | WriteLEInt(entry.IsCrypted ? (int)entry.CompressedSize + ZipConstants.CryptoHeaderSize : (int)entry.Compressed |
| | 186 | | WriteLEInt((int)entry.Size); |
| | 187 | | } |
| | 188 | | } else { |
| | 189 | | if (patchData != null) { |
| | 190 | | patchData.CrcPatchOffset = stream_.Position; |
| | 191 | | } |
| | 192 | | WriteLEInt(0); // Crc |
| | 193 | |
|
| | 194 | | if (patchData != null) { |
| | 195 | | patchData.SizePatchOffset = stream_.Position; |
| | 196 | | } |
| | 197 | |
|
| | 198 | | // For local header both sizes appear in Zip64 Extended Information |
| | 199 | | if (entry.LocalHeaderRequiresZip64 && patchEntryHeader) { |
| | 200 | | WriteLEInt(-1); |
| | 201 | | WriteLEInt(-1); |
| | 202 | | } else { |
| | 203 | | WriteLEInt(0); // Compressed size |
| | 204 | | WriteLEInt(0); // Uncompressed size |
| | 205 | | } |
| | 206 | | } |
| | 207 | |
|
| | 208 | | byte[] name = ZipConstants.ConvertToArray(entry.Flags, entry.Name); |
| | 209 | |
|
| | 210 | | if (name.Length > 0xFFFF) { |
| | 211 | | throw new ZipException("Entry name too long."); |
| | 212 | | } |
| | 213 | |
|
| | 214 | | var ed = new ZipExtraData(entry.ExtraData); |
| | 215 | |
|
| | 216 | | if (entry.LocalHeaderRequiresZip64 && (headerInfoAvailable || patchEntryHeader)) { |
| | 217 | | ed.StartNewEntry(); |
| | 218 | | if (headerInfoAvailable) { |
| | 219 | | ed.AddLeLong(entry.Size); |
| | 220 | | ed.AddLeLong(entry.CompressedSize); |
| | 221 | | } else { |
| | 222 | | ed.AddLeLong(-1); |
| | 223 | | ed.AddLeLong(-1); |
| | 224 | | } |
| | 225 | | ed.AddNewEntry(1); |
| | 226 | |
|
| | 227 | | if (!ed.Find(1)) { |
| | 228 | | throw new ZipException("Internal error cant find extra data"); |
| | 229 | | } |
| | 230 | |
|
| | 231 | | if (patchData != null) { |
| | 232 | | patchData.SizePatchOffset = ed.CurrentReadIndex; |
| | 233 | | } |
| | 234 | | } else { |
| | 235 | | ed.Delete(1); |
| | 236 | | } |
| | 237 | |
|
| | 238 | | byte[] extra = ed.GetEntryData(); |
| | 239 | |
|
| | 240 | | WriteLEShort(name.Length); |
| | 241 | | WriteLEShort(extra.Length); |
| | 242 | |
|
| | 243 | | if (name.Length > 0) { |
| | 244 | | stream_.Write(name, 0, name.Length); |
| | 245 | | } |
| | 246 | |
|
| | 247 | | if (entry.LocalHeaderRequiresZip64 && patchEntryHeader) { |
| | 248 | | patchData.SizePatchOffset += stream_.Position; |
| | 249 | | } |
| | 250 | |
|
| | 251 | | if (extra.Length > 0) { |
| | 252 | | stream_.Write(extra, 0, extra.Length); |
| | 253 | | } |
| | 254 | | } |
| | 255 | |
|
| | 256 | | /// <summary> |
| | 257 | | /// Locates a block with the desired <paramref name="signature"/>. |
| | 258 | | /// </summary> |
| | 259 | | /// <param name="signature">The signature to find.</param> |
| | 260 | | /// <param name="endLocation">Location, marking the end of block.</param> |
| | 261 | | /// <param name="minimumBlockSize">Minimum size of the block.</param> |
| | 262 | | /// <param name="maximumVariableData">The maximum variable data.</param> |
| | 263 | | /// <returns>Eeturns the offset of the first byte after the signature; -1 if not found</returns> |
| | 264 | | public long LocateBlockWithSignature(int signature, long endLocation, int minimumBlockSize, int maximumVariableData) |
| | 265 | | { |
| | 266 | | long pos = endLocation - minimumBlockSize; |
| | 267 | | if (pos < 0) { |
| | 268 | | return -1; |
| | 269 | | } |
| | 270 | |
|
| | 271 | | long giveUpMarker = Math.Max(pos - maximumVariableData, 0); |
| | 272 | |
|
| | 273 | | // TODO: This loop could be optimised for speed. |
| | 274 | | do { |
| | 275 | | if (pos < giveUpMarker) { |
| | 276 | | return -1; |
| | 277 | | } |
| | 278 | | Seek(pos--, SeekOrigin.Begin); |
| | 279 | | } while (ReadLEInt() != signature); |
| | 280 | |
|
| | 281 | | return Position; |
| | 282 | | } |
| | 283 | |
|
| | 284 | | /// <summary> |
| | 285 | | /// Write Zip64 end of central directory records (File header and locator). |
| | 286 | | /// </summary> |
| | 287 | | /// <param name="noOfEntries">The number of entries in the central directory.</param> |
| | 288 | | /// <param name="sizeEntries">The size of entries in the central directory.</param> |
| | 289 | | /// <param name="centralDirOffset">The offset of the dentral directory.</param> |
| | 290 | | public void WriteZip64EndOfCentralDirectory(long noOfEntries, long sizeEntries, long centralDirOffset) |
| | 291 | | { |
| | 292 | | long centralSignatureOffset = stream_.Position; |
| | 293 | | WriteLEInt(ZipConstants.Zip64CentralFileHeaderSignature); |
| | 294 | | WriteLELong(44); // Size of this record (total size of remaining fields in header or full size - 12) |
| | 295 | | WriteLEShort(ZipConstants.VersionMadeBy); // Version made by |
| | 296 | | WriteLEShort(ZipConstants.VersionZip64); // Version to extract |
| | 297 | | WriteLEInt(0); // Number of this disk |
| | 298 | | WriteLEInt(0); // number of the disk with the start of the central directory |
| | 299 | | WriteLELong(noOfEntries); // No of entries on this disk |
| | 300 | | WriteLELong(noOfEntries); // Total No of entries in central directory |
| | 301 | | WriteLELong(sizeEntries); // Size of the central directory |
| | 302 | | WriteLELong(centralDirOffset); // offset of start of central directory |
| | 303 | | // zip64 extensible data sector not catered for here (variable size) |
| | 304 | |
|
| | 305 | | // Write the Zip64 end of central directory locator |
| | 306 | | WriteLEInt(ZipConstants.Zip64CentralDirLocatorSignature); |
| | 307 | |
|
| | 308 | | // no of the disk with the start of the zip64 end of central directory |
| | 309 | | WriteLEInt(0); |
| | 310 | |
|
| | 311 | | // relative offset of the zip64 end of central directory record |
| | 312 | | WriteLELong(centralSignatureOffset); |
| | 313 | |
|
| | 314 | | // total number of disks |
| | 315 | | WriteLEInt(1); |
| | 316 | | } |
| | 317 | |
|
| | 318 | | /// <summary> |
| | 319 | | /// Write the required records to end the central directory. |
| | 320 | | /// </summary> |
| | 321 | | /// <param name="noOfEntries">The number of entries in the directory.</param> |
| | 322 | | /// <param name="sizeEntries">The size of the entries in the directory.</param> |
| | 323 | | /// <param name="startOfCentralDirectory">The start of the central directory.</param> |
| | 324 | | /// <param name="comment">The archive comment. (This can be null).</param> |
| | 325 | | public void WriteEndOfCentralDirectory(long noOfEntries, long sizeEntries, |
| | 326 | | long startOfCentralDirectory, byte[] comment) |
| | 327 | | { |
| | 328 | |
|
| | 329 | | if ((noOfEntries >= 0xffff) || |
| | 330 | | (startOfCentralDirectory >= 0xffffffff) || |
| | 331 | | (sizeEntries >= 0xffffffff)) { |
| | 332 | | WriteZip64EndOfCentralDirectory(noOfEntries, sizeEntries, startOfCentralDirectory); |
| | 333 | | } |
| | 334 | |
|
| | 335 | | WriteLEInt(ZipConstants.EndOfCentralDirectorySignature); |
| | 336 | |
|
| | 337 | | // TODO: ZipFile Multi disk handling not done |
| | 338 | | WriteLEShort(0); // number of this disk |
| | 339 | | WriteLEShort(0); // no of disk with start of central dir |
| | 340 | |
|
| | 341 | |
|
| | 342 | | // Number of entries |
| | 343 | | if (noOfEntries >= 0xffff) { |
| | 344 | | WriteLEUshort(0xffff); // Zip64 marker |
| | 345 | | WriteLEUshort(0xffff); |
| | 346 | | } else { |
| | 347 | | WriteLEShort((short)noOfEntries); // entries in central dir for this disk |
| | 348 | | WriteLEShort((short)noOfEntries); // total entries in central directory |
| | 349 | | } |
| | 350 | |
|
| | 351 | | // Size of the central directory |
| | 352 | | if (sizeEntries >= 0xffffffff) { |
| | 353 | | WriteLEUint(0xffffffff); // Zip64 marker |
| | 354 | | } else { |
| | 355 | | WriteLEInt((int)sizeEntries); |
| | 356 | | } |
| | 357 | |
|
| | 358 | |
|
| | 359 | | // offset of start of central directory |
| | 360 | | if (startOfCentralDirectory >= 0xffffffff) { |
| | 361 | | WriteLEUint(0xffffffff); // Zip64 marker |
| | 362 | | } else { |
| | 363 | | WriteLEInt((int)startOfCentralDirectory); |
| | 364 | | } |
| | 365 | |
|
| | 366 | | int commentLength = (comment != null) ? comment.Length : 0; |
| | 367 | |
|
| | 368 | | if (commentLength > 0xffff) { |
| | 369 | | throw new ZipException(string.Format("Comment length({0}) is too long can only be 64K", commentLength)); |
| | 370 | | } |
| | 371 | |
|
| | 372 | | WriteLEShort(commentLength); |
| | 373 | |
|
| | 374 | | if (commentLength > 0) { |
| | 375 | | Write(comment, 0, comment.Length); |
| | 376 | | } |
| | 377 | | } |
| | 378 | |
|
| | 379 | | #region LE value reading/writing |
| | 380 | | /// <summary> |
| | 381 | | /// Read an unsigned short in little endian byte order. |
| | 382 | | /// </summary> |
| | 383 | | /// <returns>Returns the value read.</returns> |
| | 384 | | /// <exception cref="IOException"> |
| | 385 | | /// An i/o error occurs. |
| | 386 | | /// </exception> |
| | 387 | | /// <exception cref="EndOfStreamException"> |
| | 388 | | /// The file ends prematurely |
| | 389 | | /// </exception> |
| | 390 | | public int ReadLEShort() |
| | 391 | | { |
| | 392 | | int byteValue1 = stream_.ReadByte(); |
| | 393 | |
|
| | 394 | | if (byteValue1 < 0) { |
| | 395 | | throw new EndOfStreamException(); |
| | 396 | | } |
| | 397 | |
|
| | 398 | | int byteValue2 = stream_.ReadByte(); |
| | 399 | | if (byteValue2 < 0) { |
| | 400 | | throw new EndOfStreamException(); |
| | 401 | | } |
| | 402 | |
|
| | 403 | | return byteValue1 | (byteValue2 << 8); |
| | 404 | | } |
| | 405 | |
|
| | 406 | | /// <summary> |
| | 407 | | /// Read an int in little endian byte order. |
| | 408 | | /// </summary> |
| | 409 | | /// <returns>Returns the value read.</returns> |
| | 410 | | /// <exception cref="IOException"> |
| | 411 | | /// An i/o error occurs. |
| | 412 | | /// </exception> |
| | 413 | | /// <exception cref="System.IO.EndOfStreamException"> |
| | 414 | | /// The file ends prematurely |
| | 415 | | /// </exception> |
| | 416 | | public int ReadLEInt() |
| | 417 | | { |
| | 418 | | return ReadLEShort() | (ReadLEShort() << 16); |
| | 419 | | } |
| | 420 | |
|
| | 421 | | /// <summary> |
| | 422 | | /// Read a long in little endian byte order. |
| | 423 | | /// </summary> |
| | 424 | | /// <returns>The value read.</returns> |
| | 425 | | public long ReadLELong() |
| | 426 | | { |
| | 427 | | return (uint)ReadLEInt() | ((long)ReadLEInt() << 32); |
| | 428 | | } |
| | 429 | |
|
| | 430 | | /// <summary> |
| | 431 | | /// Write an unsigned short in little endian byte order. |
| | 432 | | /// </summary> |
| | 433 | | /// <param name="value">The value to write.</param> |
| | 434 | | public void WriteLEShort(int value) |
| | 435 | | { |
| | 436 | | stream_.WriteByte((byte)(value & 0xff)); |
| | 437 | | stream_.WriteByte((byte)((value >> 8) & 0xff)); |
| | 438 | | } |
| | 439 | |
|
| | 440 | | /// <summary> |
| | 441 | | /// Write a ushort in little endian byte order. |
| | 442 | | /// </summary> |
| | 443 | | /// <param name="value">The value to write.</param> |
| | 444 | | public void WriteLEUshort(ushort value) |
| | 445 | | { |
| | 446 | | stream_.WriteByte((byte)(value & 0xff)); |
| | 447 | | stream_.WriteByte((byte)(value >> 8)); |
| | 448 | | } |
| | 449 | |
|
| | 450 | | /// <summary> |
| | 451 | | /// Write an int in little endian byte order. |
| | 452 | | /// </summary> |
| | 453 | | /// <param name="value">The value to write.</param> |
| | 454 | | public void WriteLEInt(int value) |
| | 455 | | { |
| | 456 | | WriteLEShort(value); |
| | 457 | | WriteLEShort(value >> 16); |
| | 458 | | } |
| | 459 | |
|
| | 460 | | /// <summary> |
| | 461 | | /// Write a uint in little endian byte order. |
| | 462 | | /// </summary> |
| | 463 | | /// <param name="value">The value to write.</param> |
| | 464 | | public void WriteLEUint(uint value) |
| | 465 | | { |
| | 466 | | WriteLEUshort((ushort)(value & 0xffff)); |
| | 467 | | WriteLEUshort((ushort)(value >> 16)); |
| | 468 | | } |
| | 469 | |
|
| | 470 | | /// <summary> |
| | 471 | | /// Write a long in little endian byte order. |
| | 472 | | /// </summary> |
| | 473 | | /// <param name="value">The value to write.</param> |
| | 474 | | public void WriteLELong(long value) |
| | 475 | | { |
| | 476 | | WriteLEInt((int)value); |
| | 477 | | WriteLEInt((int)(value >> 32)); |
| | 478 | | } |
| | 479 | |
|
| | 480 | | /// <summary> |
| | 481 | | /// Write a ulong in little endian byte order. |
| | 482 | | /// </summary> |
| | 483 | | /// <param name="value">The value to write.</param> |
| | 484 | | public void WriteLEUlong(ulong value) |
| | 485 | | { |
| | 486 | | WriteLEUint((uint)(value & 0xffffffff)); |
| | 487 | | WriteLEUint((uint)(value >> 32)); |
| | 488 | | } |
| | 489 | |
|
| | 490 | | #endregion |
| | 491 | |
|
| | 492 | | /// <summary> |
| | 493 | | /// Write a data descriptor. |
| | 494 | | /// </summary> |
| | 495 | | /// <param name="entry">The entry to write a descriptor for.</param> |
| | 496 | | /// <returns>Returns the number of descriptor bytes written.</returns> |
| | 497 | | public int WriteDataDescriptor(ZipEntry entry) |
| | 498 | | { |
| | 499 | | if (entry == null) { |
| | 500 | | throw new ArgumentNullException(nameof(entry)); |
| | 501 | | } |
| | 502 | |
|
| | 503 | | int result = 0; |
| | 504 | |
|
| | 505 | | // Add data descriptor if flagged as required |
| | 506 | | if ((entry.Flags & (int)GeneralBitFlags.Descriptor) != 0) { |
| | 507 | | // The signature is not PKZIP originally but is now described as optional |
| | 508 | | // in the PKZIP Appnote documenting trhe format. |
| | 509 | | WriteLEInt(ZipConstants.DataDescriptorSignature); |
| | 510 | | WriteLEInt(unchecked((int)(entry.Crc))); |
| | 511 | |
|
| | 512 | | result += 8; |
| | 513 | |
|
| | 514 | | if (entry.LocalHeaderRequiresZip64) { |
| | 515 | | WriteLELong(entry.CompressedSize); |
| | 516 | | WriteLELong(entry.Size); |
| | 517 | | result += 16; |
| | 518 | | } else { |
| | 519 | | WriteLEInt((int)entry.CompressedSize); |
| | 520 | | WriteLEInt((int)entry.Size); |
| | 521 | | result += 8; |
| | 522 | | } |
| | 523 | | } |
| | 524 | |
|
| | 525 | | return result; |
| | 526 | | } |
| | 527 | |
|
| | 528 | | /// <summary> |
| | 529 | | /// Read data descriptor at the end of compressed data. |
| | 530 | | /// </summary> |
| | 531 | | /// <param name="zip64">if set to <c>true</c> [zip64].</param> |
| | 532 | | /// <param name="data">The data to fill in.</param> |
| | 533 | | /// <returns>Returns the number of bytes read in the descriptor.</returns> |
| | 534 | | public void ReadDataDescriptor(bool zip64, DescriptorData data) |
| | 535 | | { |
| | 536 | | int intValue = ReadLEInt(); |
| | 537 | |
|
| | 538 | | // In theory this may not be a descriptor according to PKZIP appnote. |
| | 539 | | // In practise its always there. |
| | 540 | | if (intValue != ZipConstants.DataDescriptorSignature) { |
| | 541 | | throw new ZipException("Data descriptor signature not found"); |
| | 542 | | } |
| | 543 | |
|
| | 544 | | data.Crc = ReadLEInt(); |
| | 545 | |
|
| | 546 | | if (zip64) { |
| | 547 | | data.CompressedSize = ReadLELong(); |
| | 548 | | data.Size = ReadLELong(); |
| | 549 | | } else { |
| | 550 | | data.CompressedSize = ReadLEInt(); |
| | 551 | | data.Size = ReadLEInt(); |
| | 552 | | } |
| | 553 | | } |
| | 554 | |
|
| | 555 | | #region Instance Fields |
| | 556 | | bool isOwner_; |
| | 557 | | Stream stream_; |
| | 558 | | #endregion |
| | 559 | | } |
| | 560 | | } |