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Forum: Coders. General 27 March 2018, 19:28
Replies: 26
Views: 5,193
Posted By temisu
I'm currently doing a big cleanup. I'll add this...

I'm currently doing a big cleanup. I'll add this one there as well (or rather <string.h>). but thank you, it helps

In my madness I also wanted to add legacy zip decompressors (easy) as well as all...
Forum: Coders. General 07 November 2017, 22:36
Replies: 26
Views: 5,193
Posted By temisu
I added DMS support now. I think the...

I added DMS support now. I think the implementation is as good or better than anything else out there for DMS

It is disturbing to see that there are corner cases which are handled differently...
Forum: Coders. General 15 October 2017, 13:07
Replies: 32
Views: 5,343
Posted By temisu
Ok, one last hijack of this thread. Since we...

Ok, one last hijack of this thread. Since we already started on the RNC-topic

I (finally) fixed my implementation of the RNC1 compressor. Added leeway. Improved compression efficiency a bit. RNC...
Forum: Coders. General 01 October 2017, 15:23
Replies: 26
Views: 5,193
Posted By temisu
Well, I have most of those packers already. but...

Well, I have most of those packers already. but there are example files. I really like that especially when I do not have exe packed files yet (or support for those) for any format. :xmas

Funny...
Forum: Coders. General 07 September 2017, 08:09
Replies: 4
Views: 1,104
Posted By temisu
In the official pages there is this...

In the official pages there is this https://www.dstoecker.eu/xpkLibTest.txt

However it is made on 68060, so it is directly not usable. But I think we can see there that the speedy ones are not the...
Forum: Coders. General 15 June 2017, 11:13
Replies: 12
Views: 1,478
Posted By temisu
IFF/ILBM RLE operates per-pixel (chunky) instead...

IFF/ILBM RLE operates per-pixel (chunky) instead of per bitplane. You'd have save the image as uncompressed and then compress it by some generic compression algorithm to do this...
Forum: Coders. General 14 June 2017, 22:10
Replies: 12
Views: 1,478
Posted By temisu
Well, all modern picture compressors have more...

Well, all modern picture compressors have more context than a single scanline.

PNG has a pre-filter which takes input from 3 pixels from previous line and 1 previous pixel from same line. (after...
Forum: Coders. General 14 June 2017, 19:24
Replies: 32
Views: 5,343
Posted By temisu
You can try the scan-functionality of the...

You can try the scan-functionality of the decompressor I wrote (link in the previous post) to see if it really validates as a RNC1 stream.
Forum: Coders. General 13 June 2017, 07:27
Replies: 32
Views: 5,343
Posted By temisu
Well, if we take the test-file you sent earlier....

Well, if we take the test-file you sent earlier. RNC-propack does it in 6100 bytes, DK will do it in 6500. My thingy does it in 6350. So it is not entirely bad but still not good enough :sad

I'll...
Forum: Coders. General 11 June 2017, 13:50
Replies: 32
Views: 5,343
Posted By temisu
I have to now admit that it actually isn't so...

I have to now admit that it actually isn't so easy.

Well, making the compressor was easy, but tuning it is hard. I made the code horrible by testing few things so it is yet another difficult to...
Forum: Coders. General 03 June 2017, 14:22
Replies: 32
Views: 5,343
Posted By temisu
This is rather surprising since the compression...

This is rather surprising since the compression algorithm itself is very straightforward. Something is broken there, and the code is really bad, I wouldn't try to do non-trivial changes there.
...
Forum: Coders. General 31 May 2017, 08:30
Replies: 32
Views: 5,343
Posted By temisu
I got it working by adding this (your luck might...

I got it working by adding this (your luck might be different, the rnc seems to be very sensitive to compilers...)

Here is a diff (to the original sources). In theory the chunk count should not be...
Forum: Coders. General 31 May 2017, 07:45
Replies: 32
Views: 5,343
Posted By temisu
Well, I know why it fails. The dungeon keeper rnc...

Well, I know why it fails. The dungeon keeper rnc has only compressed 16384 of the 16662 bytes of the file properly. There is one more chunk and remaining bytes are there just fine but that chunk is...
Forum: Coders. General 30 May 2017, 11:34
Replies: 32
Views: 5,343
Posted By temisu
I don't solely believe using CRC to detect the...

I don't solely believe using CRC to detect the different versions. For me it is the last step, since there is element of error built into that (not to mention calculating CRC of a file is rather...
Forum: Coders. General 30 May 2017, 09:22
Replies: 32
Views: 5,343
Posted By temisu
Dungeon keeper RNC-utility only support 1 out of...

Dungeon keeper RNC-utility only support 1 out of the 3 different RNC-subtypes, so it is not really a generic solution. However, it supports the most popular one though

Most (i.e. not the old RNC1)...
Forum: Coders. General 08 April 2017, 18:13
Replies: 26
Views: 5,193
Posted By temisu
Should be fixed now. I don't have mingw myself,...

Should be fixed now. I don't have mingw myself, so I cant be sure.

However, since mingw does not have lstat either now it will follow symlinks, thus be careful...
Forum: Coders. General 08 April 2017, 06:54
Replies: 26
Views: 5,193
Posted By temisu
I have reached a big milestone finally which is...

I have reached a big milestone finally which is that I surpassed xpk_User when it comes to supporting different decompressors. Now there are just 24 XPK-decompressors supported (+some non-XPKs as...
Forum: Coders. General 17 March 2017, 21:03
Replies: 26
Views: 5,193
Posted By temisu
Well, I'll continue a bit more my monologue here....

Well, I'll continue a bit more my monologue here.

Cholok provided me with a excellent references of XPK-sublibs with sources. Now I know the details that I had to guess earlier. I'm thankful :)
...
Forum: Coders. General 13 March 2017, 18:52
Replies: 26
Views: 5,193
Posted By temisu
Added now a few more things for XPK: GZIP and...

Added now a few more things for XPK: GZIP and wired CrunchMania through XPK as well (CMR2, CRMS)

I still plan to add the trivial ones for XPK: CBR0, CBR1, and RLEN, as well as wire the IMPL.

(I...
Forum: Coders. General 03 March 2017, 17:28
Replies: 26
Views: 5,193
Posted By temisu
Good catch. Last minute brainfart on my side. I...

Good catch. Last minute brainfart on my side. I should not use ssize_t and I did not test the latest on 32bit...



I could not find such thing. Only thing I could find were essentially a same...
Forum: Coders. General 02 March 2017, 21:35
Replies: 26
Views: 5,193
Posted By temisu
Open source decompressors for many "old" amiga compressors

Hi,

I wanted to access/decompress some old Amiga compressed files (on a PC) and I noticed that many of the compressed files had compression formats that do not have proper cross-platforms tools....
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