Hello again :-)
How do you change a file?
Replacement would be not so good. I think a modify is a: delete and add
operation.
How do you delete a file and shrink the archive?
I thought about reading the zip spec and cutting out the bytes i don't
need.
And all this heavily depends on the used compression type. So you might
have to implement this for zip/jar/tar - ok - I know tar is not a
compressed archive - but its a archive where it might be nice to have
write support for.
Yes, of course i would have to read the spec of tar, bzip2 etc.
Hope i didn't miss your point.
I found out that i possibly can use RandomAccessFile and read byte for
byte and write in back to the same file at the same time.
Sure, but you have to write a compressed stream.
Does that matter? Byte is a Byte is a Byte, i would daresay. At the
moment i don't want to reimplement the compressing algorithms but want
to extend the Zip-API.
This may lead to a corruption of the source file when the operation is
interrupted, but is fastest.
This is bad, isnt it?
haha ok, ok you are right this is bad. Don't know why i was thinking
about it seriously :)
I could read the file as a stream and write the needed bytes as
output-stream in another temp-file which has to be mv'd to the source
after finished. That would be fast and quite secure. But i need a
tempfolder where something can get wrong.
The issue with decompressing to a temp-folder and compressing it again:
I think it would be faster if i could manipulate the bytes directly.
And what if the temp-folder is beeing manipulated while the operation
runs? What if the zipfile is huge so space in the temp-folder runs out?
throw new IOException() ;-)
Ok, lets make it easy ;-)
Thanks for your help, this is very motivating.
Christian
Ciao,
Mario
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