The Sinclair QL Forum

Posted: **Tue Feb 11, 2020 4:08 pm**

Hi,

I am toying with an old source to `unzip/infozip' ver. 5.0p1, me modified to display extra fields. I am dumping info on an executable in `foo_zip' created under `QDOS'.
I am getting this

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$ ./zipinfo -v ~/mdv1/foo_zip myexec_exe
.....
  32-bit CRC value (hex):                           d6420d7b
  compressed size:                                  17357 bytes
  uncompressed size:                                36220 bytes
  length of filename:                               12 characters
  length of extra field:                            76 bytes
  length of file comment:                           0 characters
  disk number on which file begins:                 disk 0
  apparent file type:                               binary
  Unix file attributes (100777 octal):              -rwxrwxrwx
  MS-DOS file attributes (00 hex):                  none
  offset of local header from start of archive:     116 (00000074h) bytes

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  There is an unknown extra field size:   76
  fb4a <=== a QDOS magic
  0048 <=== size that follows 72 dec
  QDOS <=== QDOS type as string
  65003230 <==== what long field is this????
  ====> 64 byte QDOS header dump
00 00 8d 7c 00 01 00 00 0c 00 00 00 00 00 00 0c 6d 64 6f 75 62 6c 65 72 5f 65 78 65 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 6d d3 2d 8f 00 02 00 00 

  There is no file comment.

I wish to know what is that extra long field `65003230' (or `30320065' in big endian)????
Many thanks.

Tomas

Posted: **Tue Feb 11, 2020 5:49 pm**

tcat wrote: I wish to know what is that extra long field `65003230' (or `30320065' in big endian)????

That's still part of the QDOS identifier, for a total of 8 bytes.
The first 6 bytes are "QDOS02".
Not sure if the 0065 has a meaning or is just padding.

Posted: **Tue Feb 11, 2020 6:41 pm**

QDOS02

Ah, does 02 stands for QDOS version number?
$0065, could it mean 02A, `A' as revision?

Tom

Posted: **Tue Feb 11, 2020 6:47 pm**

Looking at the sources, they strcpy "QDOS02", so the next 0 is the null terminator and the 65 can be ignored.

I assume 02 is a version.

Posted: **Tue Feb 11, 2020 6:53 pm**

Ah, thanks, now I see as well.

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zip.h:#define LONGID  "QDOS02"
zipup.c:                strcpy(local_qe->longid, LONGID);

Posted: **Tue Feb 11, 2020 7:55 pm**

Not sure if useful, I can now process zips created on `QDOS' showing 64-byte headers when set for file type 1.
Example: `gstqlassembler.zip' package, containing GST Assembler, with two executables ASM, and ED.

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pi@raspberrypi:/usr/src/unz50p1 $ ./zipinfo -H gstqlassembler
asm
00 00 47 9a 00 01 00 00 20 00 00 00 00 00 00 0d 67 73 74 5f 71 6c 61 73 6d 5f 61 73 6d 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 63 2f 83 ca 00 01 a6 33 
boot
clone
ed
00 00 53 e4 00 01 00 00 0f a0 00 00 00 00 00 0c 67 73 74 5f 71 6c 61 73 6d 5f 65 64 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 63 2f 83 ca 00 01 a6 37 
install
library.asm
library.in
qdos1.in
qdos2.in

Posted: **Sun Feb 23, 2020 6:47 pm**

Option -T added, it just extends file listing (-1 option) with QDOS type and dataspace next to a filename

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pi@raspberrypi:/usr/src/unz50p1 $ ./zipinfo -T gstqlassembler[.zip]
asm   type: 1, space: 8192
boot 
clone 
ed   type: 1, space: 4000
install 
library.asm 
library.in 
qdos1.in 
qdos2.in

Option -H now puts out only 14-byte header hex digit dump, useful for piping through to `mkhdr' utility, that creates binary header, with .hdr suffix. This header can be used when transporting binaries over serial line to the QL.

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pi@raspberrypi:/usr/src/unz50p1 $ ./zipinfo -H gstqlassembler
asm 00 00 47 9a 00 01 00 00 20 00 00 00 00 00 
boot 
clone 
ed 00 00 53 e4 00 01 00 00 0f a0 00 00 00 00 
install 
library.asm 
library.in 
qdos1.in 
qdos2.in

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pi@raspberrypi:/usr/src/unz50p1 $ ./zipinfo -H gstqlassembler[.zip] asm | mkhdr
pi@raspberrypi:/usr/src/unz50p1 $ hd asm.hdr
00000000  00 00 47 9a 00 01 00 00  20 00 00 00 00 00        |..G..... .....|
0000000e

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