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Search Again :: Adv Search 62 results in 0.000s
<123>
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    I've written an LZ77 en/decoding routine as I ...
    Battle Bunny Battle Bunny March 2012 Development
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …

    ... new implementation of the classic LZ77 ("Lempel-Ziv 1977") algorithm, ... [LIST]
    [*] AFAIK all existing LZ77 compressors are based on "greedy ... [B]"ZX7"[/B] uses LZ77 compression only. In practice, ... based (almost) solely on LZ77 (such as PuCrunch and ...
    Einar Saukas Einar Saukas December 2012 Brand new software
  • Huffman questionI'm pretty sure that the answer to my question is "no", but I just want a second opinion: Is it possible to somehow cram a Huffman decompressor + de…

    ... is described as "a Hybrid LZ77 and RLE compressor". It was ...
    pmsr pmsr July 2003 Sinclair Miscellaneous
  • z88dk+splib2 sprites question.I'm creating a game and I have several "states" for my main sprite, such as jump, facing left, facing right, etcetera. All those states require a dif…

    ... /> (for pucrunch which is hybrid LZ77+RLE+simply statistical compressor it ...
    Fikee Fikee October 2005 Development
  • z88dk+splib2 sprites question.I'm creating a game and I have several "states" for my main sprite, such as jump, facing left, facing right, etcetera. All those states require a dif…

    ... /> (for pucrunch which is hybrid LZ77+RLE+simply statistical compressor it ...
    Alcoholics Anonymous Alcoholics Anonymous October 2005 Development
  • z88dk+splib2 sprites question.I'm creating a game and I have several "states" for my main sprite, such as jump, facing left, facing right, etcetera. All those states require a dif…

    This is the uncrunch algo for pucrunch:

    [code]
    ;###
    ;### uncrunch.asm -- Standalone Pucrunch decompressor
    ;### Based on C64 code by Pasi Ojala
    ;### Ported to Z80 by Jussi Pitk?nen
    ;###
    ;### Thanks to Jeff ...
    na_th_an na_th_an October 2005 Development
  • Simple text compressionI just checked one idea about text compression. Do not take it as recomendation but rather as info which can you save some time when you are solving …

    ... will be nice. i discarded LZ77 just because it will not ...
    Fikee Fikee May 2009 Development
  • packers / crunchers and general compressionI'm just curious where I would find such things, coming from a c64 background also , there is shedloads. I mean the obvious things like crunchers fo…

    ... commons methods on speccy are LZ77 (and variants), RLE and Huffman ... variants) or combinations.

    LZ77 family need to keep history ...
    Fikee Fikee November 2009 Development
  • Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…

    ... Finally, here is a LZ77 depacker for the GameBoy Z80 ... ; --------------------------------------------------------------------------


    ; Depack LZ77.


    ; > ...


    lz77: ld [stack_ptr],sp
    ld ...
    ASM ASM October 2010 Development
  • Just wondering (Data compressors back in the 80s)While utilizing some sort of data compression is admittedly the norm for Speccy productions nowadays, it doesn't seem to have been the case back in t…

    ... />
    i would say that LZ77 (1977) and LZSS (1982) are ...
    Fikee Fikee January 2011 Sinclair Miscellaneous
  • New compression method: Exomizer 2After I finished working on optimizing aPLib's decoder, I was told that pucrunch did compress better, and while looking for info about pucrunch (it t…

    ... you use some algorithm of LZ77 family, you could do as ... you proposed.
    BUT - LZ77 works that way it replaces ... data. So, generally speaking, the LZ77 is not good choice. Still ... ].
    The difference is that LZ77 has sequential access to data ...
    Fikee Fikee January 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... ;607054]I've written an LZ77 en/decoding routine as I ... long).[/QUOTE]

    Typically, LZ77 algorithms uses 1 bit to ...
    Metalbrain Metalbrain March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    This is interesting,

    I am curious as to why LZ77 and not an RLE based encoding / decoding format, the reason I ask is because I have found RLE to be one of the better compression methods on limited (RAM / CPU Power) systems.
    Zetr0 Zetr0 March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... am curious as to why LZ77 and not an RLE based ... Power) systems.[/QUOTE]

    LZ77 compress way better than RLE ... you have the sequence: ABCDABCDABCDABCD, LZ77 will compress it (and RLE ...
    Metalbrain Metalbrain March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    I chose LZ77 by accident, really. It was ... an excellent description of the LZ77 process on an orphaned page ...
    Battle Bunny Battle Bunny March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... select a piece of an LZ77 file to unpack; it always ... (short).

    Apparently the LZ77 packing process can be substantially ... it works I'd expect LZ77 to be better at packing ...
    Battle Bunny Battle Bunny March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... common technique to speed up LZ77 or LZSS compression is to ...
    Battle Bunny Battle Bunny March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    So is megalz just LZ77?
    Would any LZ77 decompressor deal with megalz compressed data, and vice versa? I had a feeling that it was slightly modified?
    csmith csmith March 2012 Development
  • rotating HL left through CarryI've tried this several ways, and it works for a while, then a particular value has a bit set in an inconvenient place and it all goes to pot. Eg: "…

    ... I put into my WIP LZ77 compression routine and tested with ...
    Battle Bunny Battle Bunny March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... some stats for the WIP-LZ77 routine; a SCREEN$ on the ...
    Battle Bunny Battle Bunny March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... (although still based on the LZ77 algorithm) and now I've ...
    Battle Bunny Battle Bunny March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... .uk/~jg27paw4/pourri/wip-lz77.zip]WIP-LZ77[/url] for reference. There ...
    Battle Bunny Battle Bunny March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... .uk/~jg27paw4/pourri/wip-lz77.zip]WIP-LZ77[/url] for reference.[/QUOTE ...
    Einar Saukas Einar Saukas March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... .uk/~jg27paw4/pourri/wip-lz77.zip]WIP-LZ77[/url]. I've added ...
    Battle Bunny Battle Bunny March 2012 Development
  • House of Hell gamebook conversionAs there's potentially several people working on this I thought that I'd set up a thread in the correct section, rather than it continuing in Wanted …

    ... routine, as covered in the LZ77 thread in the Development forum ...
    Battle Bunny Battle Bunny March 2012 New game ideas
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... more deviation from the basic LZ77 algorithm; then I'll stop ...
    Battle Bunny Battle Bunny March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... .uk/~jg27paw4/pourri/wip-lz77.zip]WIP-LZ77[/url] for reference. Compression ...
    Battle Bunny Battle Bunny April 2012 Development
  • Compressors are available for Speccys ?Hi folks, although I was an wasn't strictly a speccy coder in the glory days (amstrad & amiga for the most part), I have secides to arse about with …

    ... .uk/~jg27paw4/pourri/wip-lz77.zip]WIP-LZ77[/url], based upon LZW ...
    Battle Bunny Battle Bunny November 2012 Development
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …

    ... /> [B]"ZX7"[/B] is optimal LZ77 only, i.e. it always ... best possible compression for the LZ77 method according to the chosen ... data format. However LZ77 is not always the best ... well in most cases for LZ77, but other formats may be ...
    Einar Saukas Einar Saukas December 2012 Brand new software
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …

    [QUOTE]"ZX7" is optimal LZ77 only, i.e. it always ... best possible compression for the LZ77 method according to the chosen ... data format. However LZ77 is not always the best ...
    Ralf Ralf December 2012 Brand new software
<123>

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  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …

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