Partial copy of zip archive

[nmn]

Hello there,

I'm trying to automatize some custom changes to eBooks in the epub format. Since .epub is zip-compressed I simple opened it with a ZipFile. I can parse filenames from ZipEntries and am able to open FileInputStreams to those files.

Now I want to do the following:

+ Open zip file (works)
+ Create a new .zip archive (works)
Then, I parse all ZipEntries and want to apply the following steps
+ Read and edit if the file is a .html file (works)
- Save edited .html files into the new archive (doesn't work yet)
- "Simply" copy all other files into the new archive, keeping achive structure (doesn't work yet)

So my questions are:
Is there any way to simply copy the files over without creating a reading them bytewise and writing them to a ZipOutputStream?
Is there a way to read the .html files linewise, edit them linewise and output them linewise into the new zip archive? Do I need to write them to a temporary file and copy that back into the .zip?
When exactly is compression and decompression applied?

I'd be grateful for any ideas, since I'm not new to java but never ever bothered with zip-file handling. Tnx!

[StormyWaters]

I would try instead of creating a new .zip archive, creating the folder and all the Files first, then zipping the folder to form the archive.

[nmn]

Interesting, that idea never occured to me.
Could I zip the whole folder in one go?

[StormyWaters]

Actually, nevermind. It's been awhile since I worked with zipping files, but I created a method that does this.

Basically, you would just create a ZipEntry for each File being zipped, with the path relative to the Folder being zipped. The data is still transferred using the ZipOutputStream, bytewise.