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ReadMeDocs/smt_Terms
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Personal collection » Acorn hard disk » apps » web |
| Filename: | ReadMeDocs/smt_Terms |
| Read OK: | ✔ |
| File size: | 122C bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
Duplicates
There is 1 duplicate copy of this file in the archive:
- Personal collection » Acorn ADFS disks » Greaseweazled » adfs_1.6M_NetBits.adf » ReadMeDocs/smt_Terms
- Personal collection » Acorn hard disk » apps » web » ReadMeDocs/smt_Terms
File contents
�Contents
gif2spr
Installation and Usage
Command line Usage
Notes
History
Contacting me
�gif2spr Version 1.06
A simple program to convert gif87a and gif89a graphic formats to Acorn
Sprite format. Transparency masks for the GIF files are created to
improve the appearance of the sprite. Interlaced images have been catered
for since the 2nd release. Version 1.06 will be the sixth release! Is it
just bad programming or bad testing that caused this?
I cannot be held responsible for any damage or loss of data as a result of
use or missuse of this program.
�Installation and Usage
There are currently several other programs that require gif2spr to work correctly
these normally include the latest version as of their release date. If you wish
to update one of those version please check the documentation of those programs
first but it should only require copying the new version of gif2spr to be copied
into the appropriate place.
Command line installation
Please ensure that gif2spr is in a directory pointed to by Run$Path, my copy is
saved in the library directory of my harddisc and my Run$Path looks like this.
Show Run$Path
Run$Path(Macro) : ,%.,Boot:Library.,ADFS::HardDisc4.$.Library.
�Command line Usage
You can enter the pathname of a gif as the first file argument and
the pathname of the sprite file as the second file argument.
gif2spr [-q] [-v] RAM:$.in RAM:$.out
There are two options that can also be used.
-q stops gif2spr generating error messages when things go wrong, useful when
called by other programs
-v generates verbose output.
�Notes
Only sprites with square pixel aspect ratios are generated.
This program appears to be at least twice as fast as ChangeFSI even
though ChangeFSI has hand coded LZW decompression. This made me very
happy when I tested it.
I've tested the program on 1,2,4,6,7,8 bits per pixel all the routines
have been tested since 3bpp uses the 4bpp routines and 5,6,7bpp uses 8bpp
I've only tested the transparency on 8bpp and 1bpp gifs, but the masking code is
almost identical to the pixel code so should not cause any problems. I
did check that part of the code for typos. The images I have were not
suitable for creating transparency masks as they were scanned in and
did not have large areas of single colour. This program has now been
in use for many months with very few reported errors, if you find any
please send me the report generated by gif2spr when run with the -v
option on the offending GIF file. The GIF file would also be of use.
The -q and -v options should be seperate and not of the form -qv but this
would not make much sense anyway. This may change in the future as more
options need to be added.
�History
1.03 The code to deal with interlaced gif's has been re-coded since version
2 and is more likely to work correctly. Previously some images had a few
lines in the wrong place making the image look quite odd.
1.04 has fixed a rare problem that occured when GIF's with multiple graphic
extensions caused the error message 'liblug: Unkown input file type'
1.05 Another Rare error this was created by me several versions ago. It only
happens when an empty transparent index graphic extension occurs in the data
stream and generates the message 'liblug: Unkown input file type'
1.06 It appears that there is a program out there on the Mac that generates GIFs
with an extra byte compressed on the end of the image data. The effect was to
overwrite the beginning of another malloc'd block and caused an error when trying
to free that memory. The extra byte only occures when a scan line is a multiple
of 4 pixels. I have 6 examples of this problem.
Another problem generated by a Mac program (possibly the same) caused the
same error message as above to occur but was because the gif had a strange
definition for it's colour map and caused an unallocated pointer to be freed
(This is partly bad programming but should not have occured if the gif hadh had
it's flags set correctly). As a result of all this gif2spr is now more tollerant
of strange GIF files.
My Thanks go to the following people (in no particular order)
Peter Burwood
Andrew Pullan
Doug Winter
Ben Schofield
Philip Banks
Stewart Brodie
Mike Cook
Steve Ellacott
�Contacting me
This is the Sixth distribution and was made on the 29th June 1995
Simon Truss
mailto:simon@bigblue.demon.co.uk
I can be contacted on this address until about september 95
mailto:u1smt@csc.liv.ac.uk
I can be contacted at the following address for a few years yet
(It has to be forwarded on, but it will reach me)
23 Charlton Gardens
Coulsdon
Surrey
CR5 1AS
Last Upated "Jun 29 1995"
00000000 0a 8f 43 6f 6e 74 65 6e 74 73 0a 0a 67 69 66 32 |..Contents..gif2| 00000010 73 70 72 0a 49 6e 73 74 61 6c 6c 61 74 69 6f 6e |spr.Installation| 00000020 20 61 6e 64 20 55 73 61 67 65 0a 43 6f 6d 6d 61 | and Usage.Comma| 00000030 6e 64 20 6c 69 6e 65 20 55 73 61 67 65 0a 4e 6f |nd line Usage.No| 00000040 74 65 73 0a 48 69 73 74 6f 72 79 0a 43 6f 6e 74 |tes.History.Cont| 00000050 61 63 74 69 6e 67 20 6d 65 0a 0a 8f 67 69 66 32 |acting me...gif2| 00000060 73 70 72 20 56 65 72 73 69 6f 6e 20 31 2e 30 36 |spr Version 1.06| 00000070 0a 0a 41 20 73 69 6d 70 6c 65 20 70 72 6f 67 72 |..A simple progr| 00000080 61 6d 20 74 6f 20 63 6f 6e 76 65 72 74 20 67 69 |am to convert gi| 00000090 66 38 37 61 20 61 6e 64 20 67 69 66 38 39 61 20 |f87a and gif89a | 000000a0 67 72 61 70 68 69 63 20 66 6f 72 6d 61 74 73 20 |graphic formats | 000000b0 74 6f 20 41 63 6f 72 6e 0a 53 70 72 69 74 65 20 |to Acorn.Sprite | 000000c0 66 6f 72 6d 61 74 2e 20 54 72 61 6e 73 70 61 72 |format. Transpar| 000000d0 65 6e 63 79 20 6d 61 73 6b 73 20 66 6f 72 20 74 |ency masks for t| 000000e0 68 65 20 47 49 46 20 66 69 6c 65 73 20 61 72 65 |he GIF files are| 000000f0 20 63 72 65 61 74 65 64 20 74 6f 0a 69 6d 70 72 | created to.impr| 00000100 6f 76 65 20 74 68 65 20 61 70 70 65 61 72 61 6e |ove the appearan| 00000110 63 65 20 6f 66 20 74 68 65 20 73 70 72 69 74 65 |ce of the sprite| 00000120 2e 20 49 6e 74 65 72 6c 61 63 65 64 20 69 6d 61 |. Interlaced ima| 00000130 67 65 73 20 68 61 76 65 20 62 65 65 6e 20 63 61 |ges have been ca| 00000140 74 65 72 65 64 0a 66 6f 72 20 73 69 6e 63 65 20 |tered.for since | 00000150 74 68 65 20 32 6e 64 20 72 65 6c 65 61 73 65 2e |the 2nd release.| 00000160 20 56 65 72 73 69 6f 6e 20 31 2e 30 36 20 77 69 | Version 1.06 wi| 00000170 6c 6c 20 62 65 20 74 68 65 20 73 69 78 74 68 20 |ll be the sixth | 00000180 72 65 6c 65 61 73 65 21 20 49 73 20 69 74 0a 6a |release! Is it.j| 00000190 75 73 74 20 62 61 64 20 70 72 6f 67 72 61 6d 6d |ust bad programm| 000001a0 69 6e 67 20 6f 72 20 62 61 64 20 74 65 73 74 69 |ing or bad testi| 000001b0 6e 67 20 74 68 61 74 20 63 61 75 73 65 64 20 74 |ng that caused t| 000001c0 68 69 73 3f 0a 0a 49 20 63 61 6e 6e 6f 74 20 62 |his?..I cannot b| 000001d0 65 20 68 65 6c 64 20 72 65 73 70 6f 6e 73 69 62 |e held responsib| 000001e0 6c 65 20 66 6f 72 20 61 6e 79 20 64 61 6d 61 67 |le for any damag| 000001f0 65 20 6f 72 20 6c 6f 73 73 20 6f 66 20 64 61 74 |e or loss of dat| 00000200 61 20 61 73 20 61 20 72 65 73 75 6c 74 20 6f 66 |a as a result of| 00000210 0a 75 73 65 20 6f 72 20 6d 69 73 73 75 73 65 20 |.use or missuse | 00000220 6f 66 20 74 68 69 73 20 70 72 6f 67 72 61 6d 2e |of this program.| 00000230 0a 0a 8f 49 6e 73 74 61 6c 6c 61 74 69 6f 6e 20 |...Installation | 00000240 61 6e 64 20 55 73 61 67 65 0a 0a 54 68 65 72 65 |and Usage..There| 00000250 20 61 72 65 20 63 75 72 72 65 6e 74 6c 79 20 73 | are currently s| 00000260 65 76 65 72 61 6c 20 6f 74 68 65 72 20 70 72 6f |everal other pro| 00000270 67 72 61 6d 73 20 74 68 61 74 20 72 65 71 75 69 |grams that requi| 00000280 72 65 20 67 69 66 32 73 70 72 20 74 6f 20 77 6f |re gif2spr to wo| 00000290 72 6b 20 63 6f 72 72 65 63 74 6c 79 0a 74 68 65 |rk correctly.the| 000002a0 73 65 20 6e 6f 72 6d 61 6c 6c 79 20 69 6e 63 6c |se normally incl| 000002b0 75 64 65 20 74 68 65 20 6c 61 74 65 73 74 20 76 |ude the latest v| 000002c0 65 72 73 69 6f 6e 20 61 73 20 6f 66 20 74 68 65 |ersion as of the| 000002d0 69 72 20 72 65 6c 65 61 73 65 20 64 61 74 65 2e |ir release date.| 000002e0 20 49 66 20 79 6f 75 20 77 69 73 68 0a 74 6f 20 | If you wish.to | 000002f0 75 70 64 61 74 65 20 6f 6e 65 20 6f 66 20 74 68 |update one of th| 00000300 6f 73 65 20 76 65 72 73 69 6f 6e 20 70 6c 65 61 |ose version plea| 00000310 73 65 20 63 68 65 63 6b 20 74 68 65 20 64 6f 63 |se check the doc| 00000320 75 6d 65 6e 74 61 74 69 6f 6e 20 6f 66 20 74 68 |umentation of th| 00000330 6f 73 65 20 70 72 6f 67 72 61 6d 73 0a 66 69 72 |ose programs.fir| 00000340 73 74 20 62 75 74 20 69 74 20 73 68 6f 75 6c 64 |st but it should| 00000350 20 6f 6e 6c 79 20 72 65 71 75 69 72 65 20 63 6f | only require co| 00000360 70 79 69 6e 67 20 74 68 65 20 6e 65 77 20 76 65 |pying the new ve| 00000370 72 73 69 6f 6e 20 6f 66 20 67 69 66 32 73 70 72 |rsion of gif2spr| 00000380 20 74 6f 20 62 65 20 63 6f 70 69 65 64 0a 69 6e | to be copied.in| 00000390 74 6f 20 74 68 65 20 61 70 70 72 6f 70 72 69 61 |to the appropria| 000003a0 74 65 20 70 6c 61 63 65 2e 0a 0a 43 6f 6d 6d 61 |te place...Comma| 000003b0 6e 64 20 6c 69 6e 65 20 69 6e 73 74 61 6c 6c 61 |nd line installa| 000003c0 74 69 6f 6e 0a 0a 50 6c 65 61 73 65 20 65 6e 73 |tion..Please ens| 000003d0 75 72 65 20 74 68 61 74 20 67 69 66 32 73 70 72 |ure that gif2spr| 000003e0 20 69 73 20 69 6e 20 61 20 64 69 72 65 63 74 6f | is in a directo| 000003f0 72 79 20 70 6f 69 6e 74 65 64 20 74 6f 20 62 79 |ry pointed to by| 00000400 20 52 75 6e 24 50 61 74 68 2c 20 6d 79 20 63 6f | Run$Path, my co| 00000410 70 79 20 69 73 0a 73 61 76 65 64 20 69 6e 20 74 |py is.saved in t| 00000420 68 65 20 6c 69 62 72 61 72 79 20 64 69 72 65 63 |he library direc| 00000430 74 6f 72 79 20 6f 66 20 6d 79 20 68 61 72 64 64 |tory of my hardd| 00000440 69 73 63 20 61 6e 64 20 6d 79 20 52 75 6e 24 50 |isc and my Run$P| 00000450 61 74 68 20 6c 6f 6f 6b 73 20 6c 69 6b 65 20 74 |ath looks like t| 00000460 68 69 73 2e 0a 0a 53 68 6f 77 20 52 75 6e 24 50 |his...Show Run$P| 00000470 61 74 68 20 0a 52 75 6e 24 50 61 74 68 28 4d 61 |ath .Run$Path(Ma| 00000480 63 72 6f 29 20 3a 20 2c 25 2e 2c 42 6f 6f 74 3a |cro) : ,%.,Boot:| 00000490 4c 69 62 72 61 72 79 2e 2c 41 44 46 53 3a 3a 48 |Library.,ADFS::H| 000004a0 61 72 64 44 69 73 63 34 2e 24 2e 4c 69 62 72 61 |ardDisc4.$.Libra| 000004b0 72 79 2e 0a 0a 8f 43 6f 6d 6d 61 6e 64 20 6c 69 |ry....Command li| 000004c0 6e 65 20 55 73 61 67 65 0a 0a 59 6f 75 20 63 61 |ne Usage..You ca| 000004d0 6e 20 65 6e 74 65 72 20 74 68 65 20 70 61 74 68 |n enter the path| 000004e0 6e 61 6d 65 20 6f 66 20 61 20 67 69 66 20 61 73 |name of a gif as| 000004f0 20 74 68 65 20 66 69 72 73 74 20 66 69 6c 65 20 | the first file | 00000500 61 72 67 75 6d 65 6e 74 20 61 6e 64 0a 74 68 65 |argument and.the| 00000510 20 70 61 74 68 6e 61 6d 65 20 6f 66 20 74 68 65 | pathname of the| 00000520 20 73 70 72 69 74 65 20 66 69 6c 65 20 61 73 20 | sprite file as | 00000530 74 68 65 20 73 65 63 6f 6e 64 20 66 69 6c 65 20 |the second file | 00000540 61 72 67 75 6d 65 6e 74 2e 0a 0a 67 69 66 32 73 |argument...gif2s| 00000550 70 72 20 5b 2d 71 5d 20 5b 2d 76 5d 20 52 41 4d |pr [-q] [-v] RAM| 00000560 3a 24 2e 69 6e 20 52 41 4d 3a 24 2e 6f 75 74 0a |:$.in RAM:$.out.| 00000570 0a 54 68 65 72 65 20 61 72 65 20 74 77 6f 20 6f |.There are two o| 00000580 70 74 69 6f 6e 73 20 74 68 61 74 20 63 61 6e 20 |ptions that can | 00000590 61 6c 73 6f 20 62 65 20 75 73 65 64 2e 0a 20 2d |also be used.. -| 000005a0 71 20 73 74 6f 70 73 20 67 69 66 32 73 70 72 20 |q stops gif2spr | 000005b0 67 65 6e 65 72 61 74 69 6e 67 20 65 72 72 6f 72 |generating error| 000005c0 20 6d 65 73 73 61 67 65 73 20 77 68 65 6e 20 74 | messages when t| 000005d0 68 69 6e 67 73 20 67 6f 20 77 72 6f 6e 67 2c 20 |hings go wrong, | 000005e0 75 73 65 66 75 6c 20 77 68 65 6e 0a 20 20 20 20 |useful when. | 000005f0 20 20 20 63 61 6c 6c 65 64 20 62 79 20 6f 74 68 | called by oth| 00000600 65 72 20 70 72 6f 67 72 61 6d 73 0a 20 2d 76 20 |er programs. -v | 00000610 67 65 6e 65 72 61 74 65 73 20 76 65 72 62 6f 73 |generates verbos| 00000620 65 20 6f 75 74 70 75 74 2e 0a 0a 0a 8f 4e 6f 74 |e output.....Not| 00000630 65 73 0a 0a 4f 6e 6c 79 20 73 70 72 69 74 65 73 |es..Only sprites| 00000640 20 77 69 74 68 20 73 71 75 61 72 65 20 70 69 78 | with square pix| 00000650 65 6c 20 61 73 70 65 63 74 20 72 61 74 69 6f 73 |el aspect ratios| 00000660 20 61 72 65 20 67 65 6e 65 72 61 74 65 64 2e 0a | are generated..| 00000670 0a 54 68 69 73 20 70 72 6f 67 72 61 6d 20 61 70 |.This program ap| 00000680 70 65 61 72 73 20 74 6f 20 62 65 20 61 74 20 6c |pears to be at l| 00000690 65 61 73 74 20 74 77 69 63 65 20 61 73 20 66 61 |east twice as fa| 000006a0 73 74 20 61 73 20 43 68 61 6e 67 65 46 53 49 20 |st as ChangeFSI | 000006b0 65 76 65 6e 0a 74 68 6f 75 67 68 20 43 68 61 6e |even.though Chan| 000006c0 67 65 46 53 49 20 68 61 73 20 68 61 6e 64 20 63 |geFSI has hand c| 000006d0 6f 64 65 64 20 4c 5a 57 20 64 65 63 6f 6d 70 72 |oded LZW decompr| 000006e0 65 73 73 69 6f 6e 2e 20 54 68 69 73 20 6d 61 64 |ession. This mad| 000006f0 65 20 6d 65 20 76 65 72 79 0a 68 61 70 70 79 20 |e me very.happy | 00000700 77 68 65 6e 20 49 20 74 65 73 74 65 64 20 69 74 |when I tested it| 00000710 2e 0a 0a 49 27 76 65 20 74 65 73 74 65 64 20 74 |...I've tested t| 00000720 68 65 20 70 72 6f 67 72 61 6d 20 6f 6e 20 31 2c |he program on 1,| 00000730 32 2c 34 2c 36 2c 37 2c 38 20 62 69 74 73 20 70 |2,4,6,7,8 bits p| 00000740 65 72 20 70 69 78 65 6c 20 61 6c 6c 20 74 68 65 |er pixel all the| 00000750 20 72 6f 75 74 69 6e 65 73 0a 68 61 76 65 20 62 | routines.have b| 00000760 65 65 6e 20 74 65 73 74 65 64 20 73 69 6e 63 65 |een tested since| 00000770 20 33 62 70 70 20 75 73 65 73 20 74 68 65 20 34 | 3bpp uses the 4| 00000780 62 70 70 20 72 6f 75 74 69 6e 65 73 20 61 6e 64 |bpp routines and| 00000790 20 35 2c 36 2c 37 62 70 70 20 75 73 65 73 20 38 | 5,6,7bpp uses 8| 000007a0 62 70 70 0a 49 27 76 65 20 6f 6e 6c 79 20 74 65 |bpp.I've only te| 000007b0 73 74 65 64 20 74 68 65 20 74 72 61 6e 73 70 61 |sted the transpa| 000007c0 72 65 6e 63 79 20 6f 6e 20 38 62 70 70 20 61 6e |rency on 8bpp an| 000007d0 64 20 31 62 70 70 20 67 69 66 73 2c 20 62 75 74 |d 1bpp gifs, but| 000007e0 20 74 68 65 20 6d 61 73 6b 69 6e 67 20 63 6f 64 | the masking cod| 000007f0 65 20 69 73 0a 61 6c 6d 6f 73 74 20 69 64 65 6e |e is.almost iden| 00000800 74 69 63 61 6c 20 74 6f 20 74 68 65 20 70 69 78 |tical to the pix| 00000810 65 6c 20 63 6f 64 65 20 73 6f 20 73 68 6f 75 6c |el code so shoul| 00000820 64 20 6e 6f 74 20 63 61 75 73 65 20 61 6e 79 20 |d not cause any | 00000830 70 72 6f 62 6c 65 6d 73 2e 20 49 0a 64 69 64 20 |problems. I.did | 00000840 63 68 65 63 6b 20 74 68 61 74 20 70 61 72 74 20 |check that part | 00000850 6f 66 20 74 68 65 20 63 6f 64 65 20 66 6f 72 20 |of the code for | 00000860 74 79 70 6f 73 2e 20 54 68 65 20 69 6d 61 67 65 |typos. The image| 00000870 73 20 49 20 68 61 76 65 20 77 65 72 65 20 6e 6f |s I have were no| 00000880 74 0a 73 75 69 74 61 62 6c 65 20 66 6f 72 20 63 |t.suitable for c| 00000890 72 65 61 74 69 6e 67 20 74 72 61 6e 73 70 61 72 |reating transpar| 000008a0 65 6e 63 79 20 6d 61 73 6b 73 20 61 73 20 74 68 |ency masks as th| 000008b0 65 79 20 77 65 72 65 20 73 63 61 6e 6e 65 64 20 |ey were scanned | 000008c0 69 6e 20 61 6e 64 0a 64 69 64 20 6e 6f 74 20 68 |in and.did not h| 000008d0 61 76 65 20 6c 61 72 67 65 20 61 72 65 61 73 20 |ave large areas | 000008e0 6f 66 20 73 69 6e 67 6c 65 20 63 6f 6c 6f 75 72 |of single colour| 000008f0 2e 20 54 68 69 73 20 70 72 6f 67 72 61 6d 20 68 |. This program h| 00000900 61 73 20 6e 6f 77 20 62 65 65 6e 0a 69 6e 20 75 |as now been.in u| 00000910 73 65 20 66 6f 72 20 6d 61 6e 79 20 6d 6f 6e 74 |se for many mont| 00000920 68 73 20 77 69 74 68 20 76 65 72 79 20 66 65 77 |hs with very few| 00000930 20 72 65 70 6f 72 74 65 64 20 65 72 72 6f 72 73 | reported errors| 00000940 2c 20 69 66 20 79 6f 75 20 66 69 6e 64 20 61 6e |, if you find an| 00000950 79 0a 70 6c 65 61 73 65 20 73 65 6e 64 20 6d 65 |y.please send me| 00000960 20 74 68 65 20 72 65 70 6f 72 74 20 67 65 6e 65 | the report gene| 00000970 72 61 74 65 64 20 62 79 20 67 69 66 32 73 70 72 |rated by gif2spr| 00000980 20 77 68 65 6e 20 72 75 6e 20 77 69 74 68 20 74 | when run with t| 00000990 68 65 20 2d 76 0a 6f 70 74 69 6f 6e 20 6f 6e 20 |he -v.option on | 000009a0 74 68 65 20 6f 66 66 65 6e 64 69 6e 67 20 47 49 |the offending GI| 000009b0 46 20 66 69 6c 65 2e 20 54 68 65 20 47 49 46 20 |F file. The GIF | 000009c0 66 69 6c 65 20 77 6f 75 6c 64 20 61 6c 73 6f 20 |file would also | 000009d0 62 65 20 6f 66 20 75 73 65 2e 0a 0a 54 68 65 20 |be of use...The | 000009e0 2d 71 20 61 6e 64 20 2d 76 20 6f 70 74 69 6f 6e |-q and -v option| 000009f0 73 20 73 68 6f 75 6c 64 20 62 65 20 73 65 70 65 |s should be sepe| 00000a00 72 61 74 65 20 61 6e 64 20 6e 6f 74 20 6f 66 20 |rate and not of | 00000a10 74 68 65 20 66 6f 72 6d 20 2d 71 76 20 62 75 74 |the form -qv but| 00000a20 20 74 68 69 73 0a 77 6f 75 6c 64 20 6e 6f 74 20 | this.would not | 00000a30 6d 61 6b 65 20 6d 75 63 68 20 73 65 6e 73 65 20 |make much sense | 00000a40 61 6e 79 77 61 79 2e 20 54 68 69 73 20 6d 61 79 |anyway. This may| 00000a50 20 63 68 61 6e 67 65 20 69 6e 20 74 68 65 20 66 | change in the f| 00000a60 75 74 75 72 65 20 61 73 20 6d 6f 72 65 0a 6f 70 |uture as more.op| 00000a70 74 69 6f 6e 73 20 6e 65 65 64 20 74 6f 20 62 65 |tions need to be| 00000a80 20 61 64 64 65 64 2e 0a 0a 8f 48 69 73 74 6f 72 | added....Histor| 00000a90 79 0a 0a 31 2e 30 33 20 54 68 65 20 63 6f 64 65 |y..1.03 The code| 00000aa0 20 74 6f 20 64 65 61 6c 20 77 69 74 68 20 69 6e | to deal with in| 00000ab0 74 65 72 6c 61 63 65 64 20 67 69 66 27 73 20 68 |terlaced gif's h| 00000ac0 61 73 20 62 65 65 6e 20 72 65 2d 63 6f 64 65 64 |as been re-coded| 00000ad0 20 73 69 6e 63 65 20 76 65 72 73 69 6f 6e 0a 32 | since version.2| 00000ae0 20 61 6e 64 20 69 73 20 6d 6f 72 65 20 6c 69 6b | and is more lik| 00000af0 65 6c 79 20 74 6f 20 77 6f 72 6b 20 63 6f 72 72 |ely to work corr| 00000b00 65 63 74 6c 79 2e 20 50 72 65 76 69 6f 75 73 6c |ectly. Previousl| 00000b10 79 20 73 6f 6d 65 20 69 6d 61 67 65 73 20 68 61 |y some images ha| 00000b20 64 20 61 20 66 65 77 0a 6c 69 6e 65 73 20 69 6e |d a few.lines in| 00000b30 20 74 68 65 20 77 72 6f 6e 67 20 70 6c 61 63 65 | the wrong place| 00000b40 20 6d 61 6b 69 6e 67 20 74 68 65 20 69 6d 61 67 | making the imag| 00000b50 65 20 6c 6f 6f 6b 20 71 75 69 74 65 20 6f 64 64 |e look quite odd| 00000b60 2e 0a 0a 31 2e 30 34 20 68 61 73 20 66 69 78 65 |...1.04 has fixe| 00000b70 64 20 61 20 72 61 72 65 20 70 72 6f 62 6c 65 6d |d a rare problem| 00000b80 20 74 68 61 74 20 6f 63 63 75 72 65 64 20 77 68 | that occured wh| 00000b90 65 6e 20 47 49 46 27 73 20 77 69 74 68 20 6d 75 |en GIF's with mu| 00000ba0 6c 74 69 70 6c 65 20 67 72 61 70 68 69 63 0a 65 |ltiple graphic.e| 00000bb0 78 74 65 6e 73 69 6f 6e 73 20 63 61 75 73 65 64 |xtensions caused| 00000bc0 20 74 68 65 20 65 72 72 6f 72 20 6d 65 73 73 61 | the error messa| 00000bd0 67 65 20 20 27 6c 69 62 6c 75 67 3a 20 55 6e 6b |ge 'liblug: Unk| 00000be0 6f 77 6e 20 69 6e 70 75 74 20 66 69 6c 65 20 74 |own input file t| 00000bf0 79 70 65 27 0a 0a 31 2e 30 35 20 41 6e 6f 74 68 |ype'..1.05 Anoth| 00000c00 65 72 20 52 61 72 65 20 65 72 72 6f 72 20 74 68 |er Rare error th| 00000c10 69 73 20 77 61 73 20 63 72 65 61 74 65 64 20 62 |is was created b| 00000c20 79 20 6d 65 20 73 65 76 65 72 61 6c 20 76 65 72 |y me several ver| 00000c30 73 69 6f 6e 73 20 61 67 6f 2e 20 49 74 20 6f 6e |sions ago. It on| 00000c40 6c 79 0a 68 61 70 70 65 6e 73 20 77 68 65 6e 20 |ly.happens when | 00000c50 61 6e 20 65 6d 70 74 79 20 74 72 61 6e 73 70 61 |an empty transpa| 00000c60 72 65 6e 74 20 69 6e 64 65 78 20 67 72 61 70 68 |rent index graph| 00000c70 69 63 20 65 78 74 65 6e 73 69 6f 6e 20 6f 63 63 |ic extension occ| 00000c80 75 72 73 20 69 6e 20 74 68 65 20 64 61 74 61 0a |urs in the data.| 00000c90 73 74 72 65 61 6d 20 61 6e 64 20 67 65 6e 65 72 |stream and gener| 00000ca0 61 74 65 73 20 74 68 65 20 6d 65 73 73 61 67 65 |ates the message| 00000cb0 20 27 6c 69 62 6c 75 67 3a 20 55 6e 6b 6f 77 6e | 'liblug: Unkown| 00000cc0 20 69 6e 70 75 74 20 66 69 6c 65 20 74 79 70 65 | input file type| 00000cd0 27 0a 0a 31 2e 30 36 20 49 74 20 61 70 70 65 61 |'..1.06 It appea| 00000ce0 72 73 20 74 68 61 74 20 74 68 65 72 65 20 69 73 |rs that there is| 00000cf0 20 61 20 70 72 6f 67 72 61 6d 20 6f 75 74 20 74 | a program out t| 00000d00 68 65 72 65 20 6f 6e 20 74 68 65 20 4d 61 63 20 |here on the Mac | 00000d10 74 68 61 74 20 67 65 6e 65 72 61 74 65 73 20 47 |that generates G| 00000d20 49 46 73 0a 77 69 74 68 20 61 6e 20 65 78 74 72 |IFs.with an extr| 00000d30 61 20 62 79 74 65 20 63 6f 6d 70 72 65 73 73 65 |a byte compresse| 00000d40 64 20 6f 6e 20 74 68 65 20 65 6e 64 20 6f 66 20 |d on the end of | 00000d50 74 68 65 20 69 6d 61 67 65 20 64 61 74 61 2e 20 |the image data. | 00000d60 54 68 65 20 65 66 66 65 63 74 20 77 61 73 20 74 |The effect was t| 00000d70 6f 0a 6f 76 65 72 77 72 69 74 65 20 74 68 65 20 |o.overwrite the | 00000d80 62 65 67 69 6e 6e 69 6e 67 20 6f 66 20 61 6e 6f |beginning of ano| 00000d90 74 68 65 72 20 6d 61 6c 6c 6f 63 27 64 20 62 6c |ther malloc'd bl| 00000da0 6f 63 6b 20 61 6e 64 20 63 61 75 73 65 64 20 61 |ock and caused a| 00000db0 6e 20 65 72 72 6f 72 20 77 68 65 6e 20 74 72 79 |n error when try| 00000dc0 69 6e 67 0a 74 6f 20 66 72 65 65 20 74 68 61 74 |ing.to free that| 00000dd0 20 6d 65 6d 6f 72 79 2e 20 54 68 65 20 65 78 74 | memory. The ext| 00000de0 72 61 20 62 79 74 65 20 6f 6e 6c 79 20 6f 63 63 |ra byte only occ| 00000df0 75 72 65 73 20 77 68 65 6e 20 61 20 73 63 61 6e |ures when a scan| 00000e00 20 6c 69 6e 65 20 69 73 20 61 20 6d 75 6c 74 69 | line is a multi| 00000e10 70 6c 65 0a 6f 66 20 34 20 70 69 78 65 6c 73 2e |ple.of 4 pixels.| 00000e20 20 49 20 68 61 76 65 20 36 20 65 78 61 6d 70 6c | I have 6 exampl| 00000e30 65 73 20 6f 66 20 74 68 69 73 20 70 72 6f 62 6c |es of this probl| 00000e40 65 6d 2e 0a 0a 41 6e 6f 74 68 65 72 20 70 72 6f |em...Another pro| 00000e50 62 6c 65 6d 20 67 65 6e 65 72 61 74 65 64 20 62 |blem generated b| 00000e60 79 20 61 20 4d 61 63 20 70 72 6f 67 72 61 6d 20 |y a Mac program | 00000e70 28 70 6f 73 73 69 62 6c 79 20 74 68 65 20 73 61 |(possibly the sa| 00000e80 6d 65 29 20 63 61 75 73 65 64 20 74 68 65 0a 73 |me) caused the.s| 00000e90 61 6d 65 20 65 72 72 6f 72 20 6d 65 73 73 61 67 |ame error messag| 00000ea0 65 20 61 73 20 61 62 6f 76 65 20 74 6f 20 6f 63 |e as above to oc| 00000eb0 63 75 72 20 62 75 74 20 77 61 73 20 62 65 63 61 |cur but was beca| 00000ec0 75 73 65 20 74 68 65 20 67 69 66 20 68 61 64 20 |use the gif had | 00000ed0 61 20 73 74 72 61 6e 67 65 0a 64 65 66 69 6e 69 |a strange.defini| 00000ee0 74 69 6f 6e 20 66 6f 72 20 69 74 27 73 20 63 6f |tion for it's co| 00000ef0 6c 6f 75 72 20 6d 61 70 20 61 6e 64 20 63 61 75 |lour map and cau| 00000f00 73 65 64 20 61 6e 20 75 6e 61 6c 6c 6f 63 61 74 |sed an unallocat| 00000f10 65 64 20 70 6f 69 6e 74 65 72 20 74 6f 20 62 65 |ed pointer to be| 00000f20 20 66 72 65 65 64 0a 28 54 68 69 73 20 69 73 20 | freed.(This is | 00000f30 70 61 72 74 6c 79 20 62 61 64 20 70 72 6f 67 72 |partly bad progr| 00000f40 61 6d 6d 69 6e 67 20 62 75 74 20 73 68 6f 75 6c |amming but shoul| 00000f50 64 20 6e 6f 74 20 68 61 76 65 20 6f 63 63 75 72 |d not have occur| 00000f60 65 64 20 69 66 20 74 68 65 20 67 69 66 20 68 61 |ed if the gif ha| 00000f70 64 68 20 68 61 64 0a 69 74 27 73 20 66 6c 61 67 |dh had.it's flag| 00000f80 73 20 73 65 74 20 63 6f 72 72 65 63 74 6c 79 29 |s set correctly)| 00000f90 2e 20 41 73 20 61 20 72 65 73 75 6c 74 20 6f 66 |. As a result of| 00000fa0 20 61 6c 6c 20 74 68 69 73 20 67 69 66 32 73 70 | all this gif2sp| 00000fb0 72 20 69 73 20 6e 6f 77 20 6d 6f 72 65 20 74 6f |r is now more to| 00000fc0 6c 6c 65 72 61 6e 74 0a 6f 66 20 73 74 72 61 6e |llerant.of stran| 00000fd0 67 65 20 47 49 46 20 66 69 6c 65 73 2e 0a 0a 4d |ge GIF files...M| 00000fe0 79 20 54 68 61 6e 6b 73 20 67 6f 20 74 6f 20 74 |y Thanks go to t| 00000ff0 68 65 20 66 6f 6c 6c 6f 77 69 6e 67 20 70 65 6f |he following peo| 00001000 70 6c 65 20 28 69 6e 20 6e 6f 20 70 61 72 74 69 |ple (in no parti| 00001010 63 75 6c 61 72 20 6f 72 64 65 72 29 0a 0a 20 50 |cular order).. P| 00001020 65 74 65 72 20 42 75 72 77 6f 6f 64 0a 20 41 6e |eter Burwood. An| 00001030 64 72 65 77 20 50 75 6c 6c 61 6e 0a 20 44 6f 75 |drew Pullan. Dou| 00001040 67 20 57 69 6e 74 65 72 0a 20 42 65 6e 20 53 63 |g Winter. Ben Sc| 00001050 68 6f 66 69 65 6c 64 0a 20 50 68 69 6c 69 70 20 |hofield. Philip | 00001060 42 61 6e 6b 73 0a 20 53 74 65 77 61 72 74 20 42 |Banks. Stewart B| 00001070 72 6f 64 69 65 0a 20 4d 69 6b 65 20 43 6f 6f 6b |rodie. Mike Cook| 00001080 0a 20 53 74 65 76 65 20 45 6c 6c 61 63 6f 74 74 |. Steve Ellacott| 00001090 0a 0a 0a 8f 43 6f 6e 74 61 63 74 69 6e 67 20 6d |....Contacting m| 000010a0 65 0a 0a 54 68 69 73 20 69 73 20 74 68 65 20 53 |e..This is the S| 000010b0 69 78 74 68 20 64 69 73 74 72 69 62 75 74 69 6f |ixth distributio| 000010c0 6e 20 61 6e 64 20 77 61 73 20 6d 61 64 65 20 6f |n and was made o| 000010d0 6e 20 74 68 65 20 32 39 74 68 20 4a 75 6e 65 20 |n the 29th June | 000010e0 31 39 39 35 0a 0a 53 69 6d 6f 6e 20 54 72 75 73 |1995..Simon Trus| 000010f0 73 20 0a 6d 61 69 6c 74 6f 3a 73 69 6d 6f 6e 40 |s .mailto:simon@| 00001100 62 69 67 62 6c 75 65 2e 64 65 6d 6f 6e 2e 63 6f |bigblue.demon.co| 00001110 2e 75 6b 0a 0a 49 20 63 61 6e 20 62 65 20 63 6f |.uk..I can be co| 00001120 6e 74 61 63 74 65 64 20 6f 6e 20 74 68 69 73 20 |ntacted on this | 00001130 61 64 64 72 65 73 73 20 75 6e 74 69 6c 20 61 62 |address until ab| 00001140 6f 75 74 20 73 65 70 74 65 6d 62 65 72 20 39 35 |out september 95| 00001150 20 0a 6d 61 69 6c 74 6f 3a 75 31 73 6d 74 40 63 | .mailto:u1smt@c| 00001160 73 63 2e 6c 69 76 2e 61 63 2e 75 6b 0a 0a 49 20 |sc.liv.ac.uk..I | 00001170 63 61 6e 20 62 65 20 63 6f 6e 74 61 63 74 65 64 |can be contacted| 00001180 20 61 74 20 74 68 65 20 66 6f 6c 6c 6f 77 69 6e | at the followin| 00001190 67 20 61 64 64 72 65 73 73 20 66 6f 72 20 61 20 |g address for a | 000011a0 66 65 77 20 79 65 61 72 73 20 79 65 74 0a 28 49 |few years yet.(I| 000011b0 74 20 68 61 73 20 74 6f 20 62 65 20 66 6f 72 77 |t has to be forw| 000011c0 61 72 64 65 64 20 6f 6e 2c 20 62 75 74 20 69 74 |arded on, but it| 000011d0 20 77 69 6c 6c 20 72 65 61 63 68 20 6d 65 29 0a | will reach me).| 000011e0 0a 32 33 20 43 68 61 72 6c 74 6f 6e 20 47 61 72 |.23 Charlton Gar| 000011f0 64 65 6e 73 20 0a 43 6f 75 6c 73 64 6f 6e 20 0a |dens .Coulsdon .| 00001200 53 75 72 72 65 79 20 0a 43 52 35 20 31 41 53 20 |Surrey .CR5 1AS | 00001210 0a 4c 61 73 74 20 55 70 61 74 65 64 20 22 4a 75 |.Last Upated "Ju| 00001220 6e 20 32 39 20 31 39 39 35 22 0a 0a |n 29 1995"..| 0000122c
.