public ZipEntry GetNextEntry()
{
if (_crc == null)
{
throw new InvalidOperationException("Closed.");
}
if (_entry != null)
{
CloseEntry();
}
var num = InputBuffer.ReadLeInt();
switch (num)
{
case ZipConstants.CentralHeaderSignature:
case ZipConstants.EndOfCentralDirectorySignature:
case ZipConstants.CentralHeaderDigitalSignature:
case ZipConstants.ArchiveExtraDataSignature:
case 0x6064b50:
Close();
return(null);
case 0x30304b50:
case ZipConstants.SpanningSignature:
num = InputBuffer.ReadLeInt();
break;
}
if (num != ZipConstants.LocalHeaderSignature)
{
throw new ZipException("Wrong Local header signature: 0x" + $"{num:X}");
}
var versionRequiredToExtract = (short)InputBuffer.ReadLeShort();
_flags = InputBuffer.ReadLeShort();
_method = InputBuffer.ReadLeShort();
var num3 = (uint)InputBuffer.ReadLeInt();
var num4 = InputBuffer.ReadLeInt();
Csize = InputBuffer.ReadLeInt();
_size = InputBuffer.ReadLeInt();
var num5 = InputBuffer.ReadLeShort();
var num6 = InputBuffer.ReadLeShort();
var flag = (_flags & 1) == 1;
var buffer = new byte[num5];
InputBuffer.ReadRawBuffer(buffer);
var name = ZipConstants.ConvertToStringExt(_flags, buffer);
_entry = new ZipEntry(name, versionRequiredToExtract)
{
Flags = _flags,
CompressionMethod = (CompressionMethod)_method
};
if ((_flags & 8) == 0)
{
_entry.Crc = num4 & 0xffffffffL;
_entry.Size = _size & 0xffffffffL;
_entry.CompressedSize = Csize & 0xffffffffL;
_entry.CryptoCheckValue = (byte)((num4 >> 0x18) & 0xff);
}
else
{
if (num4 != 0)
{
_entry.Crc = num4 & 0xffffffffL;
}
if (_size != 0L)
{
_entry.Size = _size & 0xffffffffL;
}
if (Csize != 0L)
{
_entry.CompressedSize = Csize & 0xffffffffL;
}
_entry.CryptoCheckValue = (byte)((num3 >> 8) & 0xff);
}
_entry.DosTime = num3;
if (num6 > 0)
{
var buffer2 = new byte[num6];
InputBuffer.ReadRawBuffer(buffer2);
_entry.ExtraData = buffer2;
}
_entry.ProcessExtraData(true);
if (_entry.CompressedSize >= 0L)
{
Csize = _entry.CompressedSize;
}
if (_entry.Size >= 0L)
{
_size = _entry.Size;
}
if ((_method == 0) && ((!flag && (Csize != _size)) || (flag && ((Csize - 12L) != _size))))
{
throw new ZipException("Stored, but compressed != uncompressed");
}
if (_entry.IsCompressionMethodSupported())
{
_internalReader = InitialRead;
}
else
{
_internalReader = ReadingNotSupported;
}
return(_entry);
}
/// <summary>
/// Advances to the next entry in the archive
/// </summary>
/// <returns>
/// The next <see cref="ZipEntry">entry</see> in the archive or null if there are no more entries.
/// </returns>
/// <remarks>
/// If the previous entry is still open <see cref="CloseEntry">CloseEntry</see> is called.
/// </remarks>
/// <exception cref="InvalidOperationException">
/// Input stream is closed
/// </exception>
/// <exception cref="ZipException">
/// Password is not set, password is invalid, compression method is invalid,
/// version required to extract is not supported
/// </exception>
public ZipEntry GetNextEntry()
{
if (crc == null)
{
throw new InvalidOperationException("Closed.");
}
if (entry != null)
{
CloseEntry();
}
int header = inputBuffer.ReadLeInt();
if (header == ZipConstants.CentralHeaderSignature ||
header == ZipConstants.EndOfCentralDirectorySignature ||
header == ZipConstants.CentralHeaderDigitalSignature ||
header == ZipConstants.ArchiveExtraDataSignature ||
header == ZipConstants.Zip64CentralFileHeaderSignature)
{
// No more individual entries exist
Close();
return(null);
}
// -jr- 07-Dec-2003 Ignore spanning temporary signatures if found
// Spanning signature is same as descriptor signature and is untested as yet.
if ((header == ZipConstants.SpanningTempSignature) || (header == ZipConstants.SpanningSignature))
{
header = inputBuffer.ReadLeInt();
}
if (header != ZipConstants.LocalHeaderSignature)
{
throw new ZipException("Wrong Local header signature: 0x" + String.Format("{0:X}", header));
}
short versionRequiredToExtract = (short)inputBuffer.ReadLeShort();
flags = inputBuffer.ReadLeShort();
method = inputBuffer.ReadLeShort();
uint dostime = (uint)inputBuffer.ReadLeInt();
int crc2 = inputBuffer.ReadLeInt();
csize = inputBuffer.ReadLeInt();
size = inputBuffer.ReadLeInt();
int nameLen = inputBuffer.ReadLeShort();
int extraLen = inputBuffer.ReadLeShort();
bool isCrypted = (flags & 1) == 1;
byte[] buffer = new byte[nameLen];
inputBuffer.ReadRawBuffer(buffer);
string name = ZipConstants.ConvertToStringExt(flags, buffer);
entry = new ZipEntry(name, versionRequiredToExtract);
entry.Flags = flags;
entry.CompressionMethod = (CompressionMethod)method;
if ((flags & 8) == 0)
{
entry.Crc = crc2 & 0xFFFFFFFFL;
entry.Size = size & 0xFFFFFFFFL;
entry.CompressedSize = csize & 0xFFFFFFFFL;
entry.CryptoCheckValue = (byte)(crc2 >> 24);
}
else
{
// This allows for GNU, WinZip and possibly other archives, the PKZIP spec
// says these values are zero under these circumstances.
if (crc2 != 0)
{
entry.Crc = crc2 & 0xFFFFFFFFL;
}
if (size != 0)
{
entry.Size = size & 0xFFFFFFFFL;
}
if (csize != 0)
{
entry.CompressedSize = csize & 0xFFFFFFFFL;
}
entry.CryptoCheckValue = (byte)((dostime >> 8) & 0xff);
}
entry.DosTime = dostime;
// If local header requires Zip64 is true then the extended header should contain
// both values.
// Handle extra data if present. This can set/alter some fields of the entry.
if (extraLen > 0)
{
byte[] extra = new byte[extraLen];
inputBuffer.ReadRawBuffer(extra);
entry.ExtraData = extra;
}
entry.ProcessExtraData(true);
if (entry.CompressedSize >= 0)
{
csize = entry.CompressedSize;
}
if (entry.Size >= 0)
{
size = entry.Size;
}
if (method == (int)CompressionMethod.Stored && (!isCrypted && csize != size || (isCrypted && csize - ZipConstants.CryptoHeaderSize != size)))
{
throw new ZipException("Stored, but compressed != uncompressed");
}
// Determine how to handle reading of data if this is attempted.
if (entry.IsCompressionMethodSupported())
{
internalReader = new ReaderDelegate(InitialRead);
}
else
{
internalReader = new ReaderDelegate(ReadingNotSupported);
}
return(entry);
}
public ZipEntry GetNextEntry()
{
if (this.crc == null)
{
throw new InvalidOperationException("Closed.");
}
if (this.entry != null)
{
this.CloseEntry();
}
int num = this.inputBuffer.ReadLeInt();
if (num == 33639248 || num == 101010256 || num == 84233040 || num == 117853008 || num == 101075792)
{
this.Close();
return(null);
}
if (num == 808471376 || num == 134695760)
{
num = this.inputBuffer.ReadLeInt();
}
if (num != 67324752)
{
throw new ZipException("Wrong Local header signature: 0x" + string.Format("{0:X}", num));
}
short versionRequiredToExtract = (short)this.inputBuffer.ReadLeShort();
this.flags = this.inputBuffer.ReadLeShort();
this.method = this.inputBuffer.ReadLeShort();
uint num2 = (uint)this.inputBuffer.ReadLeInt();
int num3 = this.inputBuffer.ReadLeInt();
this.csize = (long)this.inputBuffer.ReadLeInt();
this.size = (long)this.inputBuffer.ReadLeInt();
int num4 = this.inputBuffer.ReadLeShort();
int num5 = this.inputBuffer.ReadLeShort();
bool flag = (this.flags & 1) == 1;
byte[] array = new byte[num4];
this.inputBuffer.ReadRawBuffer(array);
string name = ZipConstants.ConvertToStringExt(this.flags, array);
this.entry = new ZipEntry(name, (int)versionRequiredToExtract);
this.entry.Flags = this.flags;
this.entry.CompressionMethod = (CompressionMethod)this.method;
if ((this.flags & 8) == 0)
{
this.entry.Crc = ((long)num3 & unchecked ((long)((ulong)-1)));
this.entry.Size = (this.size & unchecked ((long)((ulong)-1)));
this.entry.CompressedSize = (this.csize & unchecked ((long)((ulong)-1)));
this.entry.CryptoCheckValue = (byte)(num3 >> 24);
}
else
{
if (num3 != 0)
{
this.entry.Crc = ((long)num3 & unchecked ((long)((ulong)-1)));
}
if (this.size != 0L)
{
this.entry.Size = (this.size & unchecked ((long)((ulong)-1)));
}
if (this.csize != 0L)
{
this.entry.CompressedSize = (this.csize & unchecked ((long)((ulong)-1)));
}
this.entry.CryptoCheckValue = (byte)(num2 >> 8 & 255U);
}
this.entry.DosTime = (long)((ulong)num2);
if (num5 > 0)
{
byte[] array2 = new byte[num5];
this.inputBuffer.ReadRawBuffer(array2);
this.entry.ExtraData = array2;
}
this.entry.ProcessExtraData(true);
if (this.entry.CompressedSize >= 0L)
{
this.csize = this.entry.CompressedSize;
}
if (this.entry.Size >= 0L)
{
this.size = this.entry.Size;
}
if (this.method == 0 && ((!flag && this.csize != this.size) || (flag && this.csize - 12L != this.size)))
{
throw new ZipException("Stored, but compressed != uncompressed");
}
if (this.entry.IsCompressionMethodSupported())
{
this.internalReader = new ZipInputStream.ReaderDelegate(this.InitialRead);
}
else
{
this.internalReader = new ZipInputStream.ReaderDelegate(this.ReadingNotSupported);
}
return(this.entry);
}