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slackware-current/source/a/rpm2tgz/rpmoffset.c
Patrick J Volkerding 5a12e7c134 Slackware 13.0
Wed Aug 26 10:00:38 CDT 2009
Slackware 13.0 x86_64 is released as stable!  Thanks to everyone who
helped make this release possible -- see the RELEASE_NOTES for the
credits.  The ISOs are off to the replicator.  This time it will be a
6 CD-ROM 32-bit set and a dual-sided 32-bit/64-bit x86/x86_64 DVD.
We're taking pre-orders now at store.slackware.com.  Please consider
picking up a copy to help support the project.  Once again, thanks to
the entire Slackware community for all the help testing and fixing
things and offering suggestions during this development cycle.
As always, have fun and enjoy!  -P.
2018-05-31 22:41:17 +02:00

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C

/* Find how deeply inside an .RPM the real data is */
/* kept, and report the offset in bytes */
/* Wouldn't it be a lot more sane if we could just untar these things? */
#include <stdlib.h>
/* These offsets keep getting bigger, so we're going to just bite a 2MB */
/* chunk of RAM right away so that we have enough. Yeah, horrible */
/* quick and dirty implementation, but hey -- it gets the job done. */
#define RPMBUFSIZ 2097152
main()
{
char *buff = malloc(RPMBUFSIZ),*eb,*p;
for (p = buff, eb = buff + read(0,buff,RPMBUFSIZ); p < eb; p++)
if ((*p == '\037' && p[1] == '\213' && p[2] == '\010') ||
(*p == 'B' && p[1] == 'Z' && p[2] == 'h' && '1' <= p[3] && p[3] <= '9' ))
printf("%d\n",p - buff),
exit(0);
exit(1);
}