LHA - Splitting a large file into 2 archives

[DamienD]

Hello guys,

Can anyone help me with splitting a large file into say 2 x 700KB archives?

I've list / read the LHA information:





Noticed that there is an option "-V" but can't get this to work...

Can anyone tell me the exact syntax to be used?

[s2325]

I think multi volume size must have single floppy disk capacity.

[emufan]

i think it does not work with this version, but with lha150 from aminet.
you need the attached keyfile in your L: folder. and it will produce another archive,
which you also have to extract. once you have the lha version 1.50,
try the following syntax:

lha150 -V700 -r a archive.lha sys:
lha150 -V700 a archive.lha bigfile

multiple-volume / -r recursive into folders / 700kb each volume.
there might be an option to not ask after each volume is filled.

[Galahad/FLT]

Or Just use Splitz and Joinz, commonly available utils on Aminet, you can specify the size of the files you want to split to.

[DamienD]

Much appreciated emufan

...strange that this doesn't seem to work in the later version 1.21 though.

Anyway, managed to compile LHA 1.50 that you linked to and then used the 1st syntax that you provided. I now have 3 files:

a) <filename>.lha
b) <filename>.l01
b) <filename>.l02

Now for the next problem; how do I extract them? Note that each file will be on a separate disk so I guess I need to call each one in turn somehow?

[DamienD]

Originally Posted by Galahad/FLT

Or Just use Splitz and Joinz, commonly available utils on Aminet, you can specify the size of the files you want to split to.

Thank you kindly also Galahad

...though I've managed to split an .LZX archive into 3 parts using:

FSplit <filename>.lzx C 3

I'm unsure how to join. I tried the following after reading the docs but no joy:

Join <filename>.lzx-001.splt <filename>.lzx-002.splt <filename>.lzx-003.splt <filename>.lzx

[jPV]

I would avoid custom splitters/joiners which add their own headers, because we already have the Join command in AmigaOS, which can join plain splitted files. I personally split files using DOpus' split function, but there should be several commands in Aminet which split files in "standard" way too. Didn't check how the previously mentioned splitters work, but just as an opinion

[Cobe]

I use hjsplit. And I think I used in 90s too to transfer files over floppies from Amiga to PC and vice versa. It's multiplatform tool. And easy to use. If you already didn't sort out things maybe you can try it.

http://www.hjsplit.org/amiga/

[Galahad/FLT]

Most join/splitting programs you only need to specify the first file to join, and it will automatically pickup the rest itself.

[DamienD]

Originally Posted by Galahad/FLT

Most join/splitting programs you only need to specify the first file to join, and it will automatically pickup the rest itself.

Ok, I'll try that

I did however get it working, it was my mistake... The correct syntax is as follows (and documented with FSplit):

Join <filename>.lzx-001.splt <filename>.lzx-002.splt <filename>.lzx-003.splt to <filename>.lzx

...like a muppet; I had missed the part above in bold / underline

[DamienD]

Originally Posted by Cobe

I use hjsplit. And I think I used in 90s too to transfer files over floppies from Amiga to PC and vice versa. It's multiplatform tool. And easy to use. If you already didn't sort out things maybe you can try it.

http://www.hjsplit.org/amiga/

Thank you Cobe; but I need a command line tool instead of a GUI.

After splitting the original files with "FSplit": http://aminet.net/package/disk/misc/FSplit, the Amiga already has a program I can use to re-join i.e. "Join"

[SKOLMAN_MWS]

http://www.onyxsoft.se/joinsplitter.html

[DamienD]

Cheers SKOLMAN_MWS, thanks for your suggestion. I came across this on Aminet

Have found a solution now, that works a treat for my original purpose i.e:

... "FSplit" (http://aminet.net/package/disk/misc/FSplit) to split the file.
... "Join" (part of WorkBench) to join all files afterwards.

[emufan]

you were focused on lha, so you got a working way.
but yes, split/join is the better way

[DamienD]

Originally Posted by emufan

you were focused on lha, so you got a working way.

Thank you so much for you assistance emufan; very much appreciated

Only issue with the .LHA solution is that I can't work out how to extract all 3 files created afterwards.

Originally Posted by DamienD

Anyway, managed to compile LHA 1.50 that you linked to and then used the 1st syntax that you provided. I now have 3 files:

a) <filename>.lha
b) <filename>.l01
b) <filename>.l02

Now for the next problem; how do I extract them? Note that each file will be on a separate disk so I guess I need to call each one in turn somehow?

Originally Posted by emufan

but yes, split/join is the better way

Yeah, this turned out to be simplier i.e:

... Just .LZX everything up, no matter how large.
... Use FSplit to split into manageable parts.
... Use Join to re-join all parts into the original .LZX file.
... Extract the .LZX file.

The great thing for me is that I learnt something new with both solutions

[emufan]

extracting I have not tested, I was asuming, it would just work out of the box
( lha x base-archive.lha ) but it doesnt :/
funnily enough, it does work with the c:join command:
c:join base.lha base.l01 base.l02 TO full.lha
next you can just lha x full.lha. this does work, just tested right at the moment

on the other side, there must be some cryptic option for lha, to decompress such multi-volume archives,
but I cannot see, what it is :/

edit: the manual gives some hints, how to extract the multi-volume archives:

LhA -V -Qvdf0,df1 x df0:MltArc #?.c

This would extract all `.c' files (#?.c) from the
multivolume archive (-V) `MltArc.lha', alternating between
drive df0: and df1: (-Qvdf0,df1).

in my example i put all the archive parts in the ram disk, and this one did work:

lha_150 -V -Qvram x ram:base

this way, it did extract all files, asking to insert new volume after each part.

[DamienD]

Thanks again

...seems like a lot of hassle though when compared to LZX / split / rejoin / unLZX (plus LZX seems to have better compression than LHA, from what I've found)

[emufan]

np. at the end it is all about gathering information.
maybe someone can make some use out of it

I`d like to backup a large sum of data to a NAS drive, on the fly.

What is the best solution?
Is it possible to redirect the .lha file as being created to pipe: and split it?