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November/Squash/UnSquash

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 » Archimedes archive » Archimedes World » AW-1996-03-Disc 2.adf » !AcornAns_AcornAns
Filename: November/Squash/UnSquash
Read OK:
File size: 056E bytes
Load address: 0000
Exec address: 0000
File contents
   10REM >UnSquash
   20file$ = "SampleX"
   30PROCload_source_data
   40PROCdecompress_data
   50VDU 14
   60PROCdisplay_stats
   70PROCdisplay_decompressed_data
   80VDU 15
   90END
  100:
  110:
  120DEF PROCdecompress_data
  130SYS "Squash_Decompress", %1000, -1 TO workspacesize%
  140DIM decomp% decompsize%+1, work% workspacesize%
  150:
  160REM Now we decompress the data!
  170SYS "Squash_Decompress", %100, work%, data%+20, datasize%-20, decomp%, decompsize% TO status%,,,, endoutput%
  180IF status%<>0 ERROR 0, "One step decompression failed, status "+STR$status%
  190IF endoutput%-decomp%<>decompsize% ERROR 0, "Decompressed data size not as expected"
  200ENDPROC
  210:
  220DEF PROCdisplay_stats
  230PRINT "[Press shift to scroll through text below]"
  240PRINT
  250PRINT "Source file size:            ", datasize%
  260PRINT "Decompression workspace size:", workspacesize%
  270PRINT "Decompressed file size:      ", decompsize%
  280PRINT
  290ENDPROC
  300:
  310DEF PROCdisplay_decompressed_data
  320PRINT "The decompressed data, treated as a text file, reads as follows"
  330PRINT STRING$(76, "*")
  340decomp%?decompsize% = 0
  350SYS "OS_PrettyPrint", decomp%, 0, 0
  360PRINT STRING$(76, "*")
  370ENDPROC
  380:
  390DEF PROCload_source_data
  400LOCAL type%, id$
  410SYS "OS_File", 5, file$ TO objtype%,,,, datasize%
  420IF objtype%<>1 ERROR 0, "File '"+file$+"' does not exist"
  430DIM data% datasize%
  440SYS "OS_File", 255, file$, data%, 0
  450id$ = CHR$(data%?0)+CHR$(data%?1)+CHR$(data%?2)+CHR$(data%?3)
  460IF id$<>"SQSH" ERROR 0, "Squash file format not recognised"
  470decompsize% = data%!4
  480ENDPROC

� >UnSquash
file$ = "SampleX"
�load_source_data
(�decompress_data
2� 14
<�display_stats
F�display_decompressed_data
P� 15
Z�
d:
n:
x� �decompress_data
�6ș "Squash_Decompress", %1000, -1 � workspacesize%
�1� decomp% decompsize%+1, work% workspacesize%
�:
�!� Now we decompress the data!
�nș "Squash_Decompress", %100, work%, data%+20, datasize%-20, decomp%, decompsize% � status%,,,, endoutput%
�G� status%<>0 � 0, "One step decompression failed, status "+�status%
�S� endoutput%-decomp%<>decompsize% � 0, "Decompressed data size not as expected"
��
�:
�� �display_stats
�2� "[Press shift to scroll through text below]"
��
�0� "Source file size:            ", datasize%
5� "Decompression workspace size:", workspacesize%
2� "Decompressed file size:      ", decompsize%
�
"�
,:
6 � �display_decompressed_data
@G� "The decompressed data, treated as a text file, reads as follows"
J� �76, "*")
Tdecomp%?decompsize% = 0
^&ș "OS_PrettyPrint", decomp%, 0, 0
h� �76, "*")
r�
|:
�� �load_source_data
�� type%, id$
�3ș "OS_File", 5, file$ � objtype%,,,, datasize%
�8� objtype%<>1 � 0, "File '"+file$+"' does not exist"
�� data% datasize%
�&ș "OS_File", 255, file$, data%, 0
�5id$ = �(data%?0)+�(data%?1)+�(data%?2)+�(data%?3)
�:� id$<>"SQSH" � 0, "Squash file format not recognised"
�decompsize% = data%!4
��
�
00000000  0d 00 0a 0f f4 20 3e 55  6e 53 71 75 61 73 68 0d  |..... >UnSquash.|
00000010  00 14 15 66 69 6c 65 24  20 3d 20 22 53 61 6d 70  |...file$ = "Samp|
00000020  6c 65 58 22 0d 00 1e 15  f2 6c 6f 61 64 5f 73 6f  |leX".....load_so|
00000030  75 72 63 65 5f 64 61 74  61 0d 00 28 14 f2 64 65  |urce_data..(..de|
00000040  63 6f 6d 70 72 65 73 73  5f 64 61 74 61 0d 00 32  |compress_data..2|
00000050  08 ef 20 31 34 0d 00 3c  12 f2 64 69 73 70 6c 61  |.. 14..<..displa|
00000060  79 5f 73 74 61 74 73 0d  00 46 1e f2 64 69 73 70  |y_stats..F..disp|
00000070  6c 61 79 5f 64 65 63 6f  6d 70 72 65 73 73 65 64  |lay_decompressed|
00000080  5f 64 61 74 61 0d 00 50  08 ef 20 31 35 0d 00 5a  |_data..P.. 15..Z|
00000090  05 e0 0d 00 64 05 3a 0d  00 6e 05 3a 0d 00 78 16  |....d.:..n.:..x.|
000000a0  dd 20 f2 64 65 63 6f 6d  70 72 65 73 73 5f 64 61  |. .decompress_da|
000000b0  74 61 0d 00 82 36 c8 99  20 22 53 71 75 61 73 68  |ta...6.. "Squash|
000000c0  5f 44 65 63 6f 6d 70 72  65 73 73 22 2c 20 25 31  |_Decompress", %1|
000000d0  30 30 30 2c 20 2d 31 20  b8 20 77 6f 72 6b 73 70  |000, -1 . worksp|
000000e0  61 63 65 73 69 7a 65 25  0d 00 8c 31 de 20 64 65  |acesize%...1. de|
000000f0  63 6f 6d 70 25 20 64 65  63 6f 6d 70 73 69 7a 65  |comp% decompsize|
00000100  25 2b 31 2c 20 77 6f 72  6b 25 20 77 6f 72 6b 73  |%+1, work% works|
00000110  70 61 63 65 73 69 7a 65  25 0d 00 96 05 3a 0d 00  |pacesize%....:..|
00000120  a0 21 f4 20 4e 6f 77 20  77 65 20 64 65 63 6f 6d  |.!. Now we decom|
00000130  70 72 65 73 73 20 74 68  65 20 64 61 74 61 21 0d  |press the data!.|
00000140  00 aa 6e c8 99 20 22 53  71 75 61 73 68 5f 44 65  |..n.. "Squash_De|
00000150  63 6f 6d 70 72 65 73 73  22 2c 20 25 31 30 30 2c  |compress", %100,|
00000160  20 77 6f 72 6b 25 2c 20  64 61 74 61 25 2b 32 30  | work%, data%+20|
00000170  2c 20 64 61 74 61 73 69  7a 65 25 2d 32 30 2c 20  |, datasize%-20, |
00000180  64 65 63 6f 6d 70 25 2c  20 64 65 63 6f 6d 70 73  |decomp%, decomps|
00000190  69 7a 65 25 20 b8 20 73  74 61 74 75 73 25 2c 2c  |ize% . status%,,|
000001a0  2c 2c 20 65 6e 64 6f 75  74 70 75 74 25 0d 00 b4  |,, endoutput%...|
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000001c0  30 2c 20 22 4f 6e 65 20  73 74 65 70 20 64 65 63  |0, "One step dec|
000001d0  6f 6d 70 72 65 73 73 69  6f 6e 20 66 61 69 6c 65  |ompression faile|
000001e0  64 2c 20 73 74 61 74 75  73 20 22 2b c3 73 74 61  |d, status "+.sta|
000001f0  74 75 73 25 0d 00 be 53  e7 20 65 6e 64 6f 75 74  |tus%...S. endout|
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00000210  63 6f 6d 70 73 69 7a 65  25 20 85 20 30 2c 20 22  |compsize% . 0, "|
00000220  44 65 63 6f 6d 70 72 65  73 73 65 64 20 64 61 74  |Decompressed dat|
00000230  61 20 73 69 7a 65 20 6e  6f 74 20 61 73 20 65 78  |a size not as ex|
00000240  70 65 63 74 65 64 22 0d  00 c8 05 e1 0d 00 d2 05  |pected".........|
00000250  3a 0d 00 dc 14 dd 20 f2  64 69 73 70 6c 61 79 5f  |:..... .display_|
00000260  73 74 61 74 73 0d 00 e6  32 f1 20 22 5b 50 72 65  |stats...2. "[Pre|
00000270  73 73 20 73 68 69 66 74  20 74 6f 20 73 63 72 6f  |ss shift to scro|
00000280  6c 6c 20 74 68 72 6f 75  67 68 20 74 65 78 74 20  |ll through text |
00000290  62 65 6c 6f 77 5d 22 0d  00 f0 05 f1 0d 00 fa 30  |below]"........0|
000002a0  f1 20 22 53 6f 75 72 63  65 20 66 69 6c 65 20 73  |. "Source file s|
000002b0  69 7a 65 3a 20 20 20 20  20 20 20 20 20 20 20 20  |ize:            |
000002c0  22 2c 20 64 61 74 61 73  69 7a 65 25 0d 01 04 35  |", datasize%...5|
000002d0  f1 20 22 44 65 63 6f 6d  70 72 65 73 73 69 6f 6e  |. "Decompression|
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00000320  20 20 20 20 20 22 2c 20  64 65 63 6f 6d 70 73 69  |     ", decompsi|
00000330  7a 65 25 0d 01 18 05 f1  0d 01 22 05 e1 0d 01 2c  |ze%......."....,|
00000340  05 3a 0d 01 36 20 dd 20  f2 64 69 73 70 6c 61 79  |.:..6 . .display|
00000350  5f 64 65 63 6f 6d 70 72  65 73 73 65 64 5f 64 61  |_decompressed_da|
00000360  74 61 0d 01 40 47 f1 20  22 54 68 65 20 64 65 63  |ta..@G. "The dec|
00000370  6f 6d 70 72 65 73 73 65  64 20 64 61 74 61 2c 20  |ompressed data, |
00000380  74 72 65 61 74 65 64 20  61 73 20 61 20 74 65 78  |treated as a tex|
00000390  74 20 66 69 6c 65 2c 20  72 65 61 64 73 20 61 73  |t file, reads as|
000003a0  20 66 6f 6c 6c 6f 77 73  22 0d 01 4a 0f f1 20 c4  | follows"..J.. .|
000003b0  37 36 2c 20 22 2a 22 29  0d 01 54 1b 64 65 63 6f  |76, "*")..T.deco|
000003c0  6d 70 25 3f 64 65 63 6f  6d 70 73 69 7a 65 25 20  |mp%?decompsize% |
000003d0  3d 20 30 0d 01 5e 26 c8  99 20 22 4f 53 5f 50 72  |= 0..^&.. "OS_Pr|
000003e0  65 74 74 79 50 72 69 6e  74 22 2c 20 64 65 63 6f  |ettyPrint", deco|
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00000400  37 36 2c 20 22 2a 22 29  0d 01 72 05 e1 0d 01 7c  |76, "*")..r....||
00000410  05 3a 0d 01 86 17 dd 20  f2 6c 6f 61 64 5f 73 6f  |.:..... .load_so|
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00000500  28 64 61 74 61 25 3f 32  29 2b bd 28 64 61 74 61  |(data%?2)+.(data|
00000510  25 3f 33 29 0d 01 cc 3a  e7 20 69 64 24 3c 3e 22  |%?3)...:. id$<>"|
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00000530  73 68 20 66 69 6c 65 20  66 6f 72 6d 61 74 20 6e  |sh file format n|
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00000560  64 61 74 61 25 21 34 0d  01 e0 05 e1 0d ff        |data%!4.......|
0000056e