/// <summary>
/// Reads one <c>ZipEntry</c> from the given stream. If the entry is encrypted, we don't
/// decrypt at this point. We also do not decompress. Mostly we read metadata.
/// </summary>
/// <param name="zc">the ZipContainer this entry belongs to.</param>
/// <param name="first">true of this is the first entry being read from the stream.</param>
/// <returns>the <c>ZipEntry</c> read from the stream.</returns>
internal static ZipEntry ReadEntry(ZipContainer zc, bool first)
{
ZipFile zf = zc.ZipFile;
Stream s = zc.ReadStream;
System.Text.Encoding defaultEncoding = zc.ProvisionalAlternateEncoding;
ZipEntry entry = new ZipEntry();
entry._Source = ZipEntrySource.ZipFile;
entry._container = zc;
entry._archiveStream = s;
if (zf != null)
zf.OnReadEntry(true, null);
if (first) HandlePK00Prefix(s);
// Read entry header, including any encryption header
if (!ReadHeader(entry, defaultEncoding)) return null;
// Store the position in the stream for this entry
// change for workitem 8098
entry.__FileDataPosition = entry.ArchiveStream.Position;
// seek past the data without reading it. We will read on Extract()
s.Seek(entry._CompressedFileDataSize + entry._LengthOfTrailer, SeekOrigin.Current);
// ReadHeader moves the file pointer to the end of the entry header,
// as well as any encryption header.
// CompressedFileDataSize includes:
// the maybe compressed, maybe encrypted file data
// the encryption trailer, if any
// the bit 3 descriptor, if any
// workitem 5306
// http://www.codeplex.com/DotNetZip/WorkItem/View.aspx?WorkItemId=5306
HandleUnexpectedDataDescriptor(entry);
if (zf != null)
{
zf.OnReadBytes(entry);
zf.OnReadEntry(false, entry);
}
return entry;
}
/// <summary>
/// Copy metadata that may have been changed by the app. We do this when
/// resetting the zipFile instance. If the app calls Save() on a ZipFile, then
/// tries to party on that file some more, we may need to Reset() it , which
/// means re-reading the entries and then copying the metadata. I think.
/// </summary>
internal void CopyMetaData(ZipEntry source)
{
this.__FileDataPosition = source.__FileDataPosition;
this.CompressionMethod = source.CompressionMethod;
this._CompressionMethod_FromZipFile = source._CompressionMethod_FromZipFile;
this._CompressedFileDataSize = source._CompressedFileDataSize;
this._UncompressedSize = source._UncompressedSize;
this._BitField = source._BitField;
this._Source = source._Source;
this._LastModified = source._LastModified;
this._Mtime = source._Mtime;
this._Atime = source._Atime;
this._Ctime = source._Ctime;
this._ntfsTimesAreSet = source._ntfsTimesAreSet;
this._emitUnixTimes = source._emitUnixTimes;
this._emitNtfsTimes = source._emitNtfsTimes;
}
private static ZipEntry Create(string nameInArchive, ZipEntrySource source, Object arg1, Object arg2)
{
if (String.IsNullOrEmpty(nameInArchive))
throw new PMDCP.Compression.Zip.ZipException("The entry name must be non-null and non-empty.");
ZipEntry entry = new ZipEntry();
// workitem 7071
// workitem 7926 - "version made by" OS should be zero for compat with WinZip
entry._VersionMadeBy = (0 << 8) + 45; // indicates the attributes are FAT Attributes, and v4.5 of the spec
entry._Source = source;
entry._Mtime = entry._Atime = entry._Ctime = DateTime.UtcNow;
if (source == ZipEntrySource.Stream)
{
entry._sourceStream = (arg1 as Stream); // may or may not be null
}
else if (source == ZipEntrySource.WriteDelegate)
{
entry._WriteDelegate = (arg1 as WriteDelegate); // may or may not be null
}
else if (source == ZipEntrySource.JitStream)
{
entry._OpenDelegate = (arg1 as OpenDelegate); // may or may not be null
entry._CloseDelegate = (arg2 as CloseDelegate); // may or may not be null
}
else if (source == ZipEntrySource.ZipOutputStream)
{
}
// workitem 9073
else if (source == ZipEntrySource.None)
{
// make this a valid value, for later.
entry._Source = ZipEntrySource.FileSystem;
}
else
{
String filename = (arg1 as String); // must not be null
if (String.IsNullOrEmpty(filename))
throw new PMDCP.Compression.Zip.ZipException("The filename must be non-null and non-empty.");
// The named file may or may not exist at this time. For example, when
// adding a directory by name. We test existence when necessary:
// when saving the ZipFile, or when getting the attributes, and so on.
#if NETCF
// workitem 6878
// PMDCP.Compression.Zip.SharedUtilities.AdjustTime_Win32ToDotNet
entry._Mtime = File.GetLastWriteTime(filename).ToUniversalTime();
entry._Ctime = File.GetCreationTime(filename).ToUniversalTime();
entry._Atime = File.GetLastAccessTime(filename).ToUniversalTime();
// workitem 7071
// can only get attributes of files that exist.
if (File.Exists(filename) || Directory.Exists(filename))
entry._ExternalFileAttrs = (int)NetCfFile.GetAttributes(filename);
#else
// workitem 6878??
// PMDCP.Compression.Zip.SharedUtilities.AdjustTime_Win32ToDotNet
entry._Mtime = File.GetLastWriteTimeUtc(filename);
entry._Ctime = File.GetCreationTimeUtc(filename);
entry._Atime = File.GetLastAccessTimeUtc(filename);
// workitem 7071
// can only get attributes on files that exist.
if (File.Exists(filename) || Directory.Exists(filename))
entry._ExternalFileAttrs = (int)File.GetAttributes(filename);
#endif
entry._ntfsTimesAreSet = true;
entry._LocalFileName = Path.GetFullPath(filename); // workitem 8813
}
entry._LastModified = entry._Mtime;
entry._FileNameInArchive = SharedUtilities.NormalizePathForUseInZipFile(nameInArchive);
// We don't actually slurp in the file data until the caller invokes Write on this entry.
return entry;
}
internal static ZipErrorEventArgs Saving(string archiveName, ZipEntry entry, Exception exception)
{
var x = new ZipErrorEventArgs
{
EventType = ZipProgressEventType.Error_Saving,
ArchiveName = archiveName,
CurrentEntry = entry,
_exc = exception
};
return x;
}
/// <summary>
/// Constructor for the SaveProgressEventArgs.
/// </summary>
/// <param name="archiveName">the name of the zip archive.</param>
/// <param name="before">whether this is before saving the entry, or after</param>
/// <param name="entriesTotal">The total number of entries in the zip archive.</param>
/// <param name="entriesSaved">Number of entries that have been saved.</param>
/// <param name="entry">The entry involved in the event.</param>
internal SaveProgressEventArgs(string archiveName, bool before, int entriesTotal, int entriesSaved, ZipEntry entry)
: base(archiveName, (before) ? ZipProgressEventType.Saving_BeforeWriteEntry : ZipProgressEventType.Saving_AfterWriteEntry)
{
this.EntriesTotal = entriesTotal;
this.CurrentEntry = entry;
this._entriesSaved = entriesSaved;
}
internal static ExtractProgressEventArgs ExtractExisting(string archiveName, ZipEntry entry, string extractLocation)
{
var x = new ExtractProgressEventArgs
{
ArchiveName = archiveName,
EventType = ZipProgressEventType.Extracting_ExtractEntryWouldOverwrite,
CurrentEntry = entry,
_target = extractLocation,
};
return x;
}
internal static ExtractProgressEventArgs BeforeExtractEntry(string archiveName, ZipEntry entry, string extractLocation)
{
var x = new ExtractProgressEventArgs
{
ArchiveName = archiveName,
EventType = ZipProgressEventType.Extracting_BeforeExtractEntry,
CurrentEntry = entry,
_target = extractLocation,
};
return x;
}
public static ZipCrypto ForRead(string password, ZipEntry e)
{
System.IO.Stream s = e._archiveStream;
e._WeakEncryptionHeader = new byte[12];
byte[] eh = e._WeakEncryptionHeader;
ZipCrypto z = new ZipCrypto();
if (password == null)
throw new BadPasswordException("This entry requires a password.");
z.InitCipher(password);
ZipEntry.ReadWeakEncryptionHeader(s, eh);
// Decrypt the header. This has a side effect of "further initializing the
// encryption keys" in the traditional zip encryption.
byte[] DecryptedHeader = z.DecryptMessage(eh, eh.Length);
// CRC check
// According to the pkzip spec, the final byte in the decrypted header
// is the highest-order byte in the CRC. We check it here.
if (DecryptedHeader[11] != (byte)((e._Crc32 >> 24) & 0xff))
{
// In the case that bit 3 of the general purpose bit flag is set to
// indicate the presence of an 'Extended File Header' or a 'data
// descriptor' (signature 0x08074b50), the last byte of the decrypted
// header is sometimes compared with the high-order byte of the
// lastmodified time, rather than the high-order byte of the CRC, to
// verify the password.
//
// This is not documented in the PKWare Appnote.txt.
// This was discovered this by analysis of the Crypt.c source file in the InfoZip library
// http://www.info-zip.org/pub/infozip/
if ((e._BitField & 0x0008) != 0x0008)
{
throw new BadPasswordException("The password did not match.");
}
else if (DecryptedHeader[11] != (byte)((e._TimeBlob >> 8) & 0xff))
{
throw new BadPasswordException("The password did not match.");
}
// We have a good password.
}
else
{
// A-OK
}
return z;
}
internal void InternalAddEntry(String name, ZipEntry entry)
{
_entries.Add(name, entry);
_zipEntriesAsList = null;
_contentsChanged = true;
}
// Can be called from within ZipEntry.InternalExtract.
internal bool OnSingleEntryExtract(ZipEntry entry, string path, bool before)
{
if (ExtractProgress != null)
{
lock (LOCK)
{
var e = (before)
? ExtractProgressEventArgs.BeforeExtractEntry(ArchiveNameForEvent, entry, path)
: ExtractProgressEventArgs.AfterExtractEntry(ArchiveNameForEvent, entry, path);
ExtractProgress(this, e);
if (e.Cancel)
_extractOperationCanceled = true;
}
}
return _extractOperationCanceled;
}
internal bool OnSaveBlock(ZipEntry entry, Int64 bytesXferred, Int64 totalBytesToXfer)
{
if (SaveProgress != null)
{
lock (LOCK)
{
var e = SaveProgressEventArgs.ByteUpdate(ArchiveNameForEvent, entry,
bytesXferred, totalBytesToXfer);
SaveProgress(this, e);
if (e.Cancel)
_saveOperationCanceled = true;
}
}
return _saveOperationCanceled;
}
internal void OnReadEntry(bool before, ZipEntry entry)
{
if (ReadProgress != null)
{
lock (LOCK)
{
ReadProgressEventArgs e = (before)
? ReadProgressEventArgs.Before(ArchiveNameForEvent, _entries.Count)
: ReadProgressEventArgs.After(ArchiveNameForEvent, entry, _entries.Count);
ReadProgress(this, e);
}
}
}
private static bool ReadHeader(ZipEntry ze, System.Text.Encoding defaultEncoding)
{
int bytesRead = 0;
// change for workitem 8098
ze._RelativeOffsetOfLocalHeader = ze.ArchiveStream.Position;
int signature = PMDCP.Compression.Zip.SharedUtilities.ReadEntrySignature(ze.ArchiveStream);
bytesRead += 4;
// Return false if this is not a local file header signature.
if (ZipEntry.IsNotValidSig(signature))
{
// Getting "not a ZipEntry signature" is not always wrong or an error.
// This will happen after the last entry in a zipfile. In that case, we
// expect to read :
// a ZipDirEntry signature (if a non-empty zip file) or
// a ZipConstants.EndOfCentralDirectorySignature.
//
// Anything else is a surprise.
ze.ArchiveStream.Seek(-4, SeekOrigin.Current); // unread the signature
if (ZipEntry.IsNotValidZipDirEntrySig(signature) && (signature != ZipConstants.EndOfCentralDirectorySignature))
{
throw new BadReadException(String.Format(" ZipEntry::ReadHeader(): Bad signature (0x{0:X8}) at position 0x{1:X8}", signature, ze.ArchiveStream.Position));
}
return false;
}
byte[] block = new byte[26];
int n = ze.ArchiveStream.Read(block, 0, block.Length);
if (n != block.Length) return false;
bytesRead += n;
int i = 0;
ze._VersionNeeded = (Int16)(block[i++] + block[i++] * 256);
ze._BitField = (Int16)(block[i++] + block[i++] * 256);
ze._CompressionMethod_FromZipFile = ze._CompressionMethod = (Int16)(block[i++] + block[i++] * 256);
ze._TimeBlob = block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256;
// transform the time data into something usable (a DateTime)
ze._LastModified = PMDCP.Compression.Zip.SharedUtilities.PackedToDateTime(ze._TimeBlob);
ze._timestamp |= ZipEntryTimestamp.DOS;
if ((ze._BitField & 0x01) == 0x01)
{
ze._Encryption_FromZipFile = ze._Encryption = EncryptionAlgorithm.PkzipWeak; // this *may* change after processing the Extra field
ze._sourceIsEncrypted = true;
}
// NB: if ((ze._BitField & 0x0008) != 0x0008), then the Compressed, uncompressed and
// CRC values are not true values; the true values will follow the entry data.
// But, regardless of the status of bit 3 in the bitfield, the slots for
// the three amigos may contain marker values for ZIP64. So we must read them.
{
ze._Crc32 = (Int32)(block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256);
ze._CompressedSize = (uint)(block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256);
ze._UncompressedSize = (uint)(block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256);
if ((uint)ze._CompressedSize == 0xFFFFFFFF ||
(uint)ze._UncompressedSize == 0xFFFFFFFF)
ze._InputUsesZip64 = true;
}
Int16 filenameLength = (short)(block[i++] + block[i++] * 256);
Int16 extraFieldLength = (short)(block[i++] + block[i++] * 256);
block = new byte[filenameLength];
n = ze.ArchiveStream.Read(block, 0, block.Length);
bytesRead += n;
// if the UTF8 bit is set for this entry, override the encoding the application requested.
ze._actualEncoding = ((ze._BitField & 0x0800) == 0x0800)
? System.Text.Encoding.UTF8
: defaultEncoding;
// need to use this form of GetString() for .NET CF
ze._FileNameInArchive = ze._actualEncoding.GetString(block, 0, block.Length);
// when creating an entry by reading, the LocalFileName is the same as the FileNameInArchive
// No, on second thought, I think it should be empty (null).
//ze._LocalFileName = ze._FileNameInArchive;
// workitem 6898
if (ze._FileNameInArchive.EndsWith("/")) ze.MarkAsDirectory();
bytesRead += ze.ProcessExtraField(ze.ArchiveStream, extraFieldLength);
ze._LengthOfTrailer = 0;
// workitem 6607 - don't read for directories
// actually get the compressed size and CRC if necessary
if (!ze._FileNameInArchive.EndsWith("/") && (ze._BitField & 0x0008) == 0x0008)
{
// This descriptor exists only if bit 3 of the general
// purpose bit flag is set (see below). It is byte aligned
// and immediately follows the last byte of compressed data,
// as well as any encryption trailer, as with AES.
// This descriptor is used only when it was not possible to
// seek in the output .ZIP file, e.g., when the output .ZIP file
// was standard output or a non-seekable device. For ZIP64(tm) format
// archives, the compressed and uncompressed sizes are 8 bytes each.
// workitem 8098: ok (restore)
long posn = ze.ArchiveStream.Position;
// Here, we're going to loop until we find a ZipEntryDataDescriptorSignature and
// a consistent data record after that. To be consistent, the data record must
// indicate the length of the entry data.
bool wantMore = true;
long SizeOfDataRead = 0;
int tries = 0;
while (wantMore)
{
tries++;
// We call the FindSignature shared routine to find the specified signature
// in the already-opened zip archive, starting from the current cursor
// position in that filestream. If we cannot find the signature, then the
// routine returns -1, and the ReadHeader() method returns false,
// indicating we cannot read a legal entry header. If we have found it,
// then the FindSignature() method returns the number of bytes in the
// stream we had to seek forward, to find the sig. We need this to
// determine if the zip entry is valid, later.
if (ze._container.ZipFile != null)
ze._container.ZipFile.OnReadBytes(ze);
long d = PMDCP.Compression.Zip.SharedUtilities.FindSignature(ze.ArchiveStream, ZipConstants.ZipEntryDataDescriptorSignature);
if (d == -1) return false;
// total size of data read (through all loops of this).
SizeOfDataRead += d;
if (ze._InputUsesZip64)
{
// read 1x 4-byte (CRC) and 2x 8-bytes (Compressed Size, Uncompressed Size)
block = new byte[20];
n = ze.ArchiveStream.Read(block, 0, block.Length);
if (n != 20) return false;
// do not increment bytesRead - it is for entry header only.
// the data we have just read is a footer (falls after the file data)
//bytesRead += n;
i = 0;
ze._Crc32 = (Int32)(block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256);
ze._CompressedSize = BitConverter.ToInt64(block, i);
i += 8;
ze._UncompressedSize = BitConverter.ToInt64(block, i);
i += 8;
ze._LengthOfTrailer += 24; // bytes including sig, CRC, Comp and Uncomp sizes
}
else
{
// read 3x 4-byte fields (CRC, Compressed Size, Uncompressed Size)
block = new byte[12];
n = ze.ArchiveStream.Read(block, 0, block.Length);
if (n != 12) return false;
// do not increment bytesRead - it is for entry header only.
// the data we have just read is a footer (falls after the file data)
//bytesRead += n;
i = 0;
ze._Crc32 = (Int32)(block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256);
ze._CompressedSize = (uint)(block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256);
ze._UncompressedSize = (uint)(block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256);
ze._LengthOfTrailer += 16; // bytes including sig, CRC, Comp and Uncomp sizes
}
wantMore = (SizeOfDataRead != ze._CompressedSize);
if (wantMore)
{
// Seek back to un-read the last 12 bytes - maybe THEY contain
// the ZipEntryDataDescriptorSignature.
// (12 bytes for the CRC, Comp and Uncomp size.)
ze.ArchiveStream.Seek(-12, SeekOrigin.Current);
// Adjust the size to account for the false signature read in
// FindSignature().
SizeOfDataRead += 4;
}
}
// seek back to previous position, to prepare to read file data
// workitem 8098: ok (restore)
ze.ArchiveStream.Seek(posn, SeekOrigin.Begin);
}
ze._CompressedFileDataSize = ze._CompressedSize;
// bit 0 set indicates that some kind of encryption is in use
if ((ze._BitField & 0x01) == 0x01)
{
#if AESCRYPTO
if (ze.Encryption == EncryptionAlgorithm.WinZipAes128 ||
ze.Encryption == EncryptionAlgorithm.WinZipAes256)
{
int bits = ZipEntry.GetKeyStrengthInBits(ze._Encryption_FromZipFile);
// read in the WinZip AES metadata: salt + PV. 18 bytes for AES256. 10 bytes for AES128.
ze._aesCrypto_forExtract = WinZipAesCrypto.ReadFromStream(null, bits, ze.ArchiveStream);
bytesRead += ze._aesCrypto_forExtract.SizeOfEncryptionMetadata - 10; // MAC (follows crypto bytes)
// according to WinZip, the CompressedSize includes the AES Crypto framing data.
ze._CompressedFileDataSize -= ze._aesCrypto_forExtract.SizeOfEncryptionMetadata;
ze._LengthOfTrailer += 10; // MAC
}
else
#endif
{
// read in the header data for "weak" encryption
ze._WeakEncryptionHeader = new byte[12];
bytesRead += ZipEntry.ReadWeakEncryptionHeader(ze._archiveStream, ze._WeakEncryptionHeader);
// decrease the filedata size by 12 bytes
ze._CompressedFileDataSize -= 12;
}
}
// Remember the size of the blob for this entry.
// We also have the starting position in the stream for this entry.
ze._LengthOfHeader = bytesRead;
ze._TotalEntrySize = ze._LengthOfHeader + ze._CompressedFileDataSize + ze._LengthOfTrailer;
// We've read in the regular entry header, the extra field, and any encryption
// header. The pointer in the file is now at the start of the filedata, which is
// potentially compressed and encrypted. Just ahead in the file, there are
// _CompressedFileDataSize bytes of data, followed by potentially a non-zero length
// trailer, consisting of optionally, some encryption stuff (10 byte MAC for AES),
// and the bit-3 trailer (16 or 24 bytes).
return true;
}
private static void HandleUnexpectedDataDescriptor(ZipEntry entry)
{
Stream s = entry.ArchiveStream;
// In some cases, the "data descriptor" is present, without a signature, even when
// bit 3 of the BitField is NOT SET. This is the CRC, followed
// by the compressed length and the uncompressed length (4 bytes for each
// of those three elements). Need to check that here.
//
uint datum = (uint)PMDCP.Compression.Zip.SharedUtilities.ReadInt(s);
if (datum == entry._Crc32)
{
int sz = PMDCP.Compression.Zip.SharedUtilities.ReadInt(s);
if (sz == entry._CompressedSize)
{
sz = PMDCP.Compression.Zip.SharedUtilities.ReadInt(s);
if (sz == entry._UncompressedSize)
{
// ignore everything and discard it.
}
else
s.Seek(-12, SeekOrigin.Current); // unread the three blocks
}
else
s.Seek(-8, SeekOrigin.Current); // unread the two blocks
}
else
s.Seek(-4, SeekOrigin.Current); // unread the block
}
/// <summary>
/// Reads one entry from the zip directory structure in the zip file.
/// </summary>
/// <param name="zf">
/// The zipfile for which a directory entry will be read. From this param, the
/// method gets the ReadStream and the expected text encoding
/// (ProvisionalAlternateEncoding) which is used if the entry is not marked
/// UTF-8.
/// </param>
/// <returns>the entry read from the archive.</returns>
internal static ZipEntry ReadDirEntry(ZipFile zf)
{
System.IO.Stream s = zf.ReadStream;
System.Text.Encoding expectedEncoding = zf.ProvisionalAlternateEncoding;
int signature = PMDCP.Compression.Zip.SharedUtilities.ReadSignature(s);
// return null if this is not a local file header signature
if (IsNotValidZipDirEntrySig(signature))
{
s.Seek(-4, System.IO.SeekOrigin.Current);
// Getting "not a ZipDirEntry signature" here is not always wrong or an
// error. This can happen when walking through a zipfile. After the
// last ZipDirEntry, we expect to read an
// EndOfCentralDirectorySignature. When we get this is how we know
// we've reached the end of the central directory.
if (signature != ZipConstants.EndOfCentralDirectorySignature &&
signature != ZipConstants.Zip64EndOfCentralDirectoryRecordSignature &&
signature != ZipConstants.ZipEntrySignature // workitem 8299
)
{
throw new BadReadException(String.Format(" ZipEntry::ReadDirEntry(): Bad signature (0x{0:X8}) at position 0x{1:X8}", signature, s.Position));
}
return null;
}
int bytesRead = 42 + 4;
byte[] block = new byte[42];
int n = s.Read(block, 0, block.Length);
if (n != block.Length) return null;
int i = 0;
ZipEntry zde = new ZipEntry();
zde._Source = ZipEntrySource.ZipFile;
zde._container = new ZipContainer(zf);
unchecked
{
zde._VersionMadeBy = (short)(block[i++] + block[i++] * 256);
zde._VersionNeeded = (short)(block[i++] + block[i++] * 256);
zde._BitField = (short)(block[i++] + block[i++] * 256);
zde._CompressionMethod = (Int16)(block[i++] + block[i++] * 256);
zde._TimeBlob = block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256;
zde._LastModified = PMDCP.Compression.Zip.SharedUtilities.PackedToDateTime(zde._TimeBlob);
zde._timestamp |= ZipEntryTimestamp.DOS;
zde._Crc32 = block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256;
zde._CompressedSize = (uint)(block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256);
zde._UncompressedSize = (uint)(block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256);
}
// preserve
zde._CompressionMethod_FromZipFile = zde._CompressionMethod;
zde._filenameLength = (short)(block[i++] + block[i++] * 256);
zde._extraFieldLength = (short)(block[i++] + block[i++] * 256);
zde._commentLength = (short)(block[i++] + block[i++] * 256);
zde._diskNumber = (UInt32)(block[i++] + block[i++] * 256);
zde._InternalFileAttrs = (short)(block[i++] + block[i++] * 256);
zde._ExternalFileAttrs = block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256;
zde._RelativeOffsetOfLocalHeader = (uint)(block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256);
// workitem 7801
zde.IsText = ((zde._InternalFileAttrs & 0x01) == 0x01);
block = new byte[zde._filenameLength];
n = s.Read(block, 0, block.Length);
bytesRead += n;
if ((zde._BitField & 0x0800) == 0x0800)
{
// UTF-8 is in use
zde._FileNameInArchive = PMDCP.Compression.Zip.SharedUtilities.Utf8StringFromBuffer(block);
}
else
{
zde._FileNameInArchive = PMDCP.Compression.Zip.SharedUtilities.StringFromBuffer(block, expectedEncoding);
}
// Console.WriteLine("\nEntry : {0}", zde._LocalFileName);
// Console.WriteLine(" V Madeby/Needed: 0x{0:X4} / 0x{1:X4}", zde._VersionMadeBy, zde._VersionNeeded);
// Console.WriteLine(" BitField/Compression: 0x{0:X4} / 0x{1:X4}", zde._BitField, zde._CompressionMethod);
// Console.WriteLine(" Lastmod: {0}", zde._LastModified.ToString("u"));
// Console.WriteLine(" CRC: 0x{0:X8}", zde._Crc32);
// Console.WriteLine(" Comp / Uncomp: 0x{0:X8} ({0}) 0x{1:X8} ({1})", zde._CompressedSize, zde._UncompressedSize);
//zde._FileNameInArchive = zde._LocalFileName;
if (zde.AttributesIndicateDirectory) zde.MarkAsDirectory(); // may append a slash to filename if nec.
// workitem 6898
else if (zde._FileNameInArchive.EndsWith("/")) zde.MarkAsDirectory();
zde._CompressedFileDataSize = zde._CompressedSize;
if ((zde._BitField & 0x01) == 0x01)
{
zde._Encryption_FromZipFile = zde._Encryption = EncryptionAlgorithm.PkzipWeak; // this may change after processing the Extra field
zde._sourceIsEncrypted = true;
}
if (zde._extraFieldLength > 0)
{
zde._InputUsesZip64 = (zde._CompressedSize == 0xFFFFFFFF ||
zde._UncompressedSize == 0xFFFFFFFF ||
zde._RelativeOffsetOfLocalHeader == 0xFFFFFFFF);
// Console.WriteLine(" Input uses Z64?: {0}", zde._InputUsesZip64);
bytesRead += zde.ProcessExtraField(s, zde._extraFieldLength);
zde._CompressedFileDataSize = zde._CompressedSize;
}
// we've processed the extra field, so we know the encryption method is set now.
if (zde._Encryption == EncryptionAlgorithm.PkzipWeak)
{
// the "encryption header" of 12 bytes precedes the file data
zde._CompressedFileDataSize -= 12;
}
#if AESCRYPTO
else if (zde.Encryption == EncryptionAlgorithm.WinZipAes128 ||
zde.Encryption == EncryptionAlgorithm.WinZipAes256)
{
zde._CompressedFileDataSize = zde.CompressedSize -
(ZipEntry.GetLengthOfCryptoHeaderBytes(zde.Encryption) + 10);
zde._LengthOfTrailer = 10;
}
#endif
// tally the trailing descriptor
if ((zde._BitField & 0x0008) == 0x0008)
{
// sig, CRC, Comp and Uncomp sizes
if (zde._InputUsesZip64)
zde._LengthOfTrailer += 24;
else
zde._LengthOfTrailer += 16;
}
if (zde._commentLength > 0)
{
block = new byte[zde._commentLength];
n = s.Read(block, 0, block.Length);
bytesRead += n;
if ((zde._BitField & 0x0800) == 0x0800)
{
// UTF-8 is in use
zde._Comment = PMDCP.Compression.Zip.SharedUtilities.Utf8StringFromBuffer(block);
}
else
{
zde._Comment = PMDCP.Compression.Zip.SharedUtilities.StringFromBuffer(block, expectedEncoding);
}
}
//zde._LengthOfDirEntry = bytesRead;
return zde;
}
/// <summary>
/// Reads one entry from the zip directory structure in the zip file.
/// </summary>
/// <param name="zf">
/// The zipfile for which a directory entry will be read. From this param, the
/// method gets the ReadStream and the expected text encoding
/// (ProvisionalAlternateEncoding) which is used if the entry is not marked
/// UTF-8.
/// </param>
/// <returns>the entry read from the archive.</returns>
internal static ZipEntry ReadDirEntry(ZipFile zf)
{
System.IO.Stream s = zf.ReadStream;
System.Text.Encoding expectedEncoding = zf.ProvisionalAlternateEncoding;
int signature = PMDCP.Compression.Zip.SharedUtilities.ReadSignature(s);
// return null if this is not a local file header signature
if (IsNotValidZipDirEntrySig(signature))
{
s.Seek(-4, System.IO.SeekOrigin.Current);
// Getting "not a ZipDirEntry signature" here is not always wrong or an
// error. This can happen when walking through a zipfile. After the
// last ZipDirEntry, we expect to read an
// EndOfCentralDirectorySignature. When we get this is how we know
// we've reached the end of the central directory.
if (signature != ZipConstants.EndOfCentralDirectorySignature &&
signature != ZipConstants.Zip64EndOfCentralDirectoryRecordSignature &&
signature != ZipConstants.ZipEntrySignature // workitem 8299
)
{
throw new BadReadException(String.Format(" ZipEntry::ReadDirEntry(): Bad signature (0x{0:X8}) at position 0x{1:X8}", signature, s.Position));
}
return(null);
}
int bytesRead = 42 + 4;
byte[] block = new byte[42];
int n = s.Read(block, 0, block.Length);
if (n != block.Length)
{
return(null);
}
int i = 0;
ZipEntry zde = new ZipEntry();
zde._Source = ZipEntrySource.ZipFile;
zde._container = new ZipContainer(zf);
unchecked
{
zde._VersionMadeBy = (short)(block[i++] + block[i++] * 256);
zde._VersionNeeded = (short)(block[i++] + block[i++] * 256);
zde._BitField = (short)(block[i++] + block[i++] * 256);
zde._CompressionMethod = (Int16)(block[i++] + block[i++] * 256);
zde._TimeBlob = block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256;
zde._LastModified = PMDCP.Compression.Zip.SharedUtilities.PackedToDateTime(zde._TimeBlob);
zde._timestamp |= ZipEntryTimestamp.DOS;
zde._Crc32 = block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256;
zde._CompressedSize = (uint)(block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256);
zde._UncompressedSize = (uint)(block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256);
}
// preserve
zde._CompressionMethod_FromZipFile = zde._CompressionMethod;
zde._filenameLength = (short)(block[i++] + block[i++] * 256);
zde._extraFieldLength = (short)(block[i++] + block[i++] * 256);
zde._commentLength = (short)(block[i++] + block[i++] * 256);
zde._diskNumber = (UInt32)(block[i++] + block[i++] * 256);
zde._InternalFileAttrs = (short)(block[i++] + block[i++] * 256);
zde._ExternalFileAttrs = block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256;
zde._RelativeOffsetOfLocalHeader = (uint)(block[i++] + block[i++] * 256 + block[i++] * 256 * 256 + block[i++] * 256 * 256 * 256);
// workitem 7801
zde.IsText = ((zde._InternalFileAttrs & 0x01) == 0x01);
block = new byte[zde._filenameLength];
n = s.Read(block, 0, block.Length);
bytesRead += n;
if ((zde._BitField & 0x0800) == 0x0800)
{
// UTF-8 is in use
zde._FileNameInArchive = PMDCP.Compression.Zip.SharedUtilities.Utf8StringFromBuffer(block);
}
else
{
zde._FileNameInArchive = PMDCP.Compression.Zip.SharedUtilities.StringFromBuffer(block, expectedEncoding);
}
// Console.WriteLine("\nEntry : {0}", zde._LocalFileName);
// Console.WriteLine(" V Madeby/Needed: 0x{0:X4} / 0x{1:X4}", zde._VersionMadeBy, zde._VersionNeeded);
// Console.WriteLine(" BitField/Compression: 0x{0:X4} / 0x{1:X4}", zde._BitField, zde._CompressionMethod);
// Console.WriteLine(" Lastmod: {0}", zde._LastModified.ToString("u"));
// Console.WriteLine(" CRC: 0x{0:X8}", zde._Crc32);
// Console.WriteLine(" Comp / Uncomp: 0x{0:X8} ({0}) 0x{1:X8} ({1})", zde._CompressedSize, zde._UncompressedSize);
//zde._FileNameInArchive = zde._LocalFileName;
if (zde.AttributesIndicateDirectory)
{
zde.MarkAsDirectory(); // may append a slash to filename if nec.
}
// workitem 6898
else if (zde._FileNameInArchive.EndsWith("/"))
{
zde.MarkAsDirectory();
}
zde._CompressedFileDataSize = zde._CompressedSize;
if ((zde._BitField & 0x01) == 0x01)
{
zde._Encryption_FromZipFile = zde._Encryption = EncryptionAlgorithm.PkzipWeak; // this may change after processing the Extra field
zde._sourceIsEncrypted = true;
}
if (zde._extraFieldLength > 0)
{
zde._InputUsesZip64 = (zde._CompressedSize == 0xFFFFFFFF ||
zde._UncompressedSize == 0xFFFFFFFF ||
zde._RelativeOffsetOfLocalHeader == 0xFFFFFFFF);
// Console.WriteLine(" Input uses Z64?: {0}", zde._InputUsesZip64);
bytesRead += zde.ProcessExtraField(s, zde._extraFieldLength);
zde._CompressedFileDataSize = zde._CompressedSize;
}
// we've processed the extra field, so we know the encryption method is set now.
if (zde._Encryption == EncryptionAlgorithm.PkzipWeak)
{
// the "encryption header" of 12 bytes precedes the file data
zde._CompressedFileDataSize -= 12;
}
#if AESCRYPTO
else if (zde.Encryption == EncryptionAlgorithm.WinZipAes128 ||
zde.Encryption == EncryptionAlgorithm.WinZipAes256)
{
zde._CompressedFileDataSize = zde.CompressedSize -
(ZipEntry.GetLengthOfCryptoHeaderBytes(zde.Encryption) + 10);
zde._LengthOfTrailer = 10;
}
#endif
// tally the trailing descriptor
if ((zde._BitField & 0x0008) == 0x0008)
{
// sig, CRC, Comp and Uncomp sizes
if (zde._InputUsesZip64)
{
zde._LengthOfTrailer += 24;
}
else
{
zde._LengthOfTrailer += 16;
}
}
if (zde._commentLength > 0)
{
block = new byte[zde._commentLength];
n = s.Read(block, 0, block.Length);
bytesRead += n;
if ((zde._BitField & 0x0800) == 0x0800)
{
// UTF-8 is in use
zde._Comment = PMDCP.Compression.Zip.SharedUtilities.Utf8StringFromBuffer(block);
}
else
{
zde._Comment = PMDCP.Compression.Zip.SharedUtilities.StringFromBuffer(block, expectedEncoding);
}
}
//zde._LengthOfDirEntry = bytesRead;
return(zde);
}
internal bool OnZipErrorSaving(ZipEntry entry, Exception exc)
{
if (ZipError != null)
{
lock (LOCK)
{
var e = ZipErrorEventArgs.Saving(this.Name, entry, exc);
ZipError(this, e);
if (e.Cancel)
_saveOperationCanceled = true;
}
}
return _saveOperationCanceled;
}
private ZipEntry _InternalAddEntry(ZipEntry ze)
{
// stamp all the props onto the entry
ze._container = new ZipContainer(this);
ze.CompressionLevel = CompressionLevel;
ze.ExtractExistingFile = ExtractExistingFile;
ze.ZipErrorAction = this.ZipErrorAction;
ze.SetCompression = SetCompression;
ze.ProvisionalAlternateEncoding = ProvisionalAlternateEncoding;
ze.Password = _Password;
ze.Encryption = Encryption;
ze.EmitTimesInWindowsFormatWhenSaving = _emitNtfsTimes;
ze.EmitTimesInUnixFormatWhenSaving = _emitUnixTimes;
//string key = DictionaryKeyForEntry(ze);
InternalAddEntry(ze.FileName,ze);
AfterAddEntry(ze);
return ze;
}
private void OnExtractEntry(int current, bool before, ZipEntry currentEntry, string path)
{
if (ExtractProgress != null)
{
lock (LOCK)
{
var e = new ExtractProgressEventArgs(ArchiveNameForEvent, before, _entries.Count, current, currentEntry, path);
ExtractProgress(this, e);
if (e.Cancel)
_extractOperationCanceled = true;
}
}
}
/// <summary>
/// Constructor for the ExtractProgressEventArgs.
/// </summary>
/// <param name="archiveName">the name of the zip archive.</param>
/// <param name="before">whether this is before saving the entry, or after</param>
/// <param name="entriesTotal">The total number of entries in the zip archive.</param>
/// <param name="entriesExtracted">Number of entries that have been extracted.</param>
/// <param name="entry">The entry involved in the event.</param>
/// <param name="extractLocation">The location to which entries are extracted.</param>
internal ExtractProgressEventArgs(string archiveName, bool before, int entriesTotal, int entriesExtracted, ZipEntry entry, string extractLocation)
: base(archiveName, (before) ? ZipProgressEventType.Extracting_BeforeExtractEntry : ZipProgressEventType.Extracting_AfterExtractEntry)
{
this.EntriesTotal = entriesTotal;
this.CurrentEntry = entry;
this._entriesExtracted = entriesExtracted;
this._target = extractLocation;
}
private void OnSaveEntry(int current, ZipEntry entry, bool before)
{
if (SaveProgress != null)
{
lock (LOCK)
{
var e = new SaveProgressEventArgs(ArchiveNameForEvent, before, _entries.Count, current, entry);
SaveProgress(this, e);
if (e.Cancel)
_saveOperationCanceled = true;
}
}
}
internal static ExtractProgressEventArgs ByteUpdate(string archiveName, ZipEntry entry, Int64 bytesWritten, Int64 totalBytes)
{
var x = new ExtractProgressEventArgs(archiveName, ZipProgressEventType.Extracting_EntryBytesWritten);
x.ArchiveName = archiveName;
x.CurrentEntry = entry;
x.BytesTransferred = bytesWritten;
x.TotalBytesToTransfer = totalBytes;
return x;
}
internal void AfterAddEntry(ZipEntry entry)
{
if (AddProgress != null)
{
lock (LOCK)
{
var e = AddProgressEventArgs.AfterEntry(ArchiveNameForEvent, entry, _entries.Count);
AddProgress(this, e);
}
}
}
internal static ReadProgressEventArgs After(string archiveName, ZipEntry entry, int entriesTotal)
{
var x = new ReadProgressEventArgs(archiveName, ZipProgressEventType.Reading_AfterReadEntry);
x.EntriesTotal = entriesTotal;
x.CurrentEntry = entry;
return x;
}
// Can be called from within ZipEntry._ExtractOne.
internal bool OnExtractBlock(ZipEntry entry, Int64 bytesWritten, Int64 totalBytesToWrite)
{
if (ExtractProgress != null)
{
lock (LOCK)
{
var e = ExtractProgressEventArgs.ByteUpdate(ArchiveNameForEvent, entry,
bytesWritten, totalBytesToWrite);
ExtractProgress(this, e);
if (e.Cancel)
_extractOperationCanceled = true;
}
}
return _extractOperationCanceled;
}
internal static SaveProgressEventArgs ByteUpdate(string archiveName, ZipEntry entry, Int64 bytesXferred, Int64 totalBytes)
{
var x = new SaveProgressEventArgs(archiveName, ZipProgressEventType.Saving_EntryBytesRead);
x.ArchiveName = archiveName;
x.CurrentEntry = entry;
x.BytesTransferred = bytesXferred;
x.TotalBytesToTransfer = totalBytes;
return x;
}
internal bool OnExtractExisting(ZipEntry entry, string path)
{
if (ExtractProgress != null)
{
lock (LOCK)
{
var e = ExtractProgressEventArgs.ExtractExisting(ArchiveNameForEvent, entry, path);
ExtractProgress(this, e);
if (e.Cancel)
_extractOperationCanceled = true;
}
}
return _extractOperationCanceled;
}
/// <summary>
/// Read the next entry from the zip file.
/// </summary>
///
/// <remarks>
/// <para>
/// Call this method just before calling <see cref="Read(byte[], int, int)"/>,
/// to position the pointer in the zip file to the next entry that can be
/// read. Subsequent calls to <c>Read()</c>, will decrypt and decompress the
/// data in the zip file, until <c>Read()</c> returns 0.
/// </para>
///
/// <para>
/// Each time you call <c>GetNextEntry()</c>, the pointer in the wrapped
/// stream is moved to the next entry in the zip file. If you call <see
/// cref="Seek(long, SeekOrigin)"/>, and thus re-position the pointer within
/// the file, you will need to call <c>GetNextEntry()</c> again, to insure
/// that the file pointer is positioned at the beginning of a zip entry.
/// </para>
///
/// <para>
/// This method returns the <c>ZipEntry</c>. Using a stream approach, you will
/// read the raw bytes for an entry in a zip file via calls to <c>Read()</c>.
/// Alternatively, you can extract an entry into a file, or a stream, by
/// calling <see cref="ZipEntry.Extract()"/>, or one of its siblings.
/// </para>
///
/// </remarks>
///
/// <returns>
/// The <c>ZipEntry</c> read. Returns null (or Nothing in VB) if there are no more
/// entries in the zip file.
/// </returns>
///
public ZipEntry GetNextEntry()
{
if (_findRequired)
{
// find the next signature
long d = SharedUtilities.FindSignature(_inputStream, ZipConstants.ZipEntrySignature);
if (d == -1) return null;
// back up 4 bytes: ReadEntry assumes the file pointer is positioned before the entry signature
_inputStream.Seek(-4, SeekOrigin.Current);
}
_currentEntry = ZipEntry.ReadEntry(_container, !_firstEntry);
_endOfEntry = _inputStream.Position;
_firstEntry = true;
_needSetup = true;
_findRequired= false;
return _currentEntry;
}
internal void OnReadBytes(ZipEntry entry)
{
if (ReadProgress != null)
{
lock (LOCK)
{
var e = ReadProgressEventArgs.ByteUpdate(ArchiveNameForEvent,
entry,
ReadStream.Position,
LengthOfReadStream);
ReadProgress(this, e);
}
}
}
