C# Class Ionic.Zip.ZipEntry

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.

generate and return a byte array that encodes the filename for the entry.

side effects: generate and store into _CommentBytes the byte array for any comment attached to the entry. Also sets _actualEncoding to indicate the actual encoding used. The same encoding is used for both filename and comment.

Prepare the given stream for output - wrap it in a CountingStream, and then in a CRC stream, and an encryptor and deflator as appropriate.

Previously this was used in ZipEntry.Write(), but in an effort to introduce some efficiencies in that method I've refactored to put the code inline. This method still gets called by ZipOutputStream.

Stores the position of the entry source stream, or, if the position is already stored, seeks to that position.

This method is called in prep for reading the source stream. If PKZIP encryption is used, then we need to calc the CRC32 before doing the encryption, because the CRC is used in the 12th byte of the PKZIP encryption header. So, we need to be able to seek backward in the source when saving the ZipEntry. This method is called from the place that calculates the CRC, and also from the method that does the encryption of the file data.

The first time through, this method sets the _sourceStreamOriginalPosition field. Subsequent calls to this method seek to that position.

Set the input stream and get its length, if possible. The length is used for progress updates, AND, to allow an optimization in case of a stream/file of zero length. In that case we skip the Encrypt and compression Stream. (like DeflateStream or BZip2OutputStream)