[cups.general] How to send jobs to a SCSI printer with cups?

[Mike Fedyk]

Mike Fedyk wrote:

> Mike Fedyk wrote:
>
>> Is this right?
>>
>> In scsi-linux.c at line 185:
>>
>>      scsi_cmd[0] = 0x0a;       /* Group 0 print command */
>>      scsi_cmd[1] = 0x00;
>>      scsi_cmd[2] = bytes / 65536;
>>      scsi_cmd[3] = bytes / 256;
>>      scsi_cmd[4] = bytes;
>>      scsi_cmd[5] = 0x00;
>>
>> According to [1], the format should be
>>
>> Operation code (0Ah)
>> LUN
>> MSB
>> Transfer Length
>> LSB
>> Control
>>
>> I don't know if the linux scsi stack changes the orders of the fields 
>> though...
>>
>> [1]
>> http://www.danbbs.dk/~dino/SCSI/SCSI2-11.html
>>
> Here's a patch:
> --- scsi-linux.c.orig   2004-09-10 16:14:08.000000000 -0700
> +++ scsi-linux.c        2004-09-10 16:17:20.000000000 -0700
> @@ -185,8 +185,8 @@
>       scsi_cmd[0] = 0x0a;      /* Group 0 print command */
>       scsi_cmd[1] = 0x00;
>       scsi_cmd[2] = bytes / 65536;
> -      scsi_cmd[3] = bytes / 256;
> -      scsi_cmd[4] = bytes;
> +      scsi_cmd[3] = bytes;
> +      scsi_cmd[4] = bytes / 256;
>       scsi_cmd[5] = 0x00;
>
>       for (try = 0; try < 10; try ++)
>
>------------------------------------------------------------------------
>
>--- scsi-linux.c.orig	2004-09-10 16:14:08.000000000 -0700
>+++ scsi-linux.c	2004-09-10 16:17:20.000000000 -0700
>@@ -185,8 +185,8 @@
>       scsi_cmd[0] = 0x0a;	/* Group 0 print command */
>       scsi_cmd[1] = 0x00;
>       scsi_cmd[2] = bytes / 65536;
>-      scsi_cmd[3] = bytes / 256;
>-      scsi_cmd[4] = bytes;
>+      scsi_cmd[3] = bytes;
>+      scsi_cmd[4] = bytes / 256;
>       scsi_cmd[5] = 0x00;
> 
>       for (try = 0; try < 10; try ++)
>  
>
Well, if I did find a bug, it looks like this is the proper fix even 
though the buffer size is only 8k bytes...

--- scsi-linux.c.orig   2004-09-10 16:14:08.000000000 -0700
+++ scsi-linux.c        2004-09-10 19:02:47.000000000 -0700
@@ -184,9 +184,9 @@

       scsi_cmd[0] = 0x0a;      /* Group 0 print command */
       scsi_cmd[1] = 0x00;
-      scsi_cmd[2] = bytes / 65536;
-      scsi_cmd[3] = bytes / 256;
-      scsi_cmd[4] = bytes;
+      scsi_cmd[3] = bytes / 16777216;  /* High 8 bit value of Transfer 
Lenght */
+      scsi_cmd[2] = bytes / 65536;     /* Middle 8 bit value of 
Transfer Lenght */
+      scsi_cmd[4] = bytes / 256;       /* Low 8 bit value of Transfer 
Lenght */
       scsi_cmd[5] = 0x00;

       for (try = 0; try < 10; try ++)

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