public Stream WriteToStream(string entryPath, DateTime?modificationTime, string comment, string password = null, Crc32?crc = null, CompressionInfo compressionInfo = null)
{
entryPath = NormalizeFilename(entryPath);
modificationTime = modificationTime ?? DateTime.Now;
comment = comment ?? string.Empty;
var explicitPassword = password ?? this.password;
bool doEncryption = !String.IsNullOrEmpty(explicitPassword);
var entry = new ZipCentralDirectoryEntry()
{
Comment = comment,
FileName = entryPath,
ModificationTime = modificationTime,
HeaderOffset = (uint)streamPosition,
IsEncrypted = doEncryption
};
var headersize = (uint)WriteHeader(entryPath, modificationTime, doEncryption, compressionInfo);
Stream outputStream;
if (doEncryption)
{
byte[] encryptionHeader;
PkwareTraditionalEncryptionData pkwareTraditionalEncryptionData;
if (OutputStream.CanSeek)
{
if (crc.HasValue)
{
pkwareTraditionalEncryptionData = PkwareTraditionalEncryptionData.ForWrite(explicitPassword, (uint)(int)crc, out encryptionHeader);
}
else
{
throw new ArgumentNullException(nameof(crc), "Crc32 must be provided when password is set and target archive stream supports seeking");
}
}
else
{
pkwareTraditionalEncryptionData = PkwareTraditionalEncryptionData.ForWrite(explicitPassword, modificationTime, out encryptionHeader);
}
OutputStream.Write(encryptionHeader, 0, encryptionHeader.Length);
entry.Compressed += (uint)encryptionHeader.Length;
outputStream = new PkwareTraditionalCryptoStream(OutputStream, pkwareTraditionalEncryptionData, CryptoMode.Encrypt);
}
else
{
outputStream = OutputStream;
}
streamPosition += headersize;
return(new ZipWritingStream(this, outputStream, entry, compressionInfo));
}
internal PkwareTraditionalEncryptionData ComposeEncryptionData(Stream archiveStream)
{
if (archiveStream is null)
{
throw new ArgumentNullException(nameof(archiveStream));
}
var buffer = new byte[12];
archiveStream.ReadFully(buffer);
PkwareTraditionalEncryptionData encryptionData = PkwareTraditionalEncryptionData.ForRead(Password !, this, buffer);
return(encryptionData);
}
