lib/rpmlead.c

   1 /** \ingroup lead
   2  * \file lib/rpmlead.c
   3  */
   4
   5 #include "system.h"
   6
   7 #if HAVE_MACHINE_TYPES_H
   8 # include <machine/types.h>
   9 #endif
  10
  11 #include <netinet/in.h>
  12
  13 #include <rpmlib.h>
  14
  15 #include "rpmlead.h"
  16 #include "debug.h"
  17
  18 /*@unchecked@*/ /*@observer@*/
  19 static unsigned char lead_magic[] = {
  20     RPMLEAD_MAGIC0, RPMLEAD_MAGIC1, RPMLEAD_MAGIC2, RPMLEAD_MAGIC3
  21 };
  22
  23 /* The lead needs to be 8 byte aligned */
  24
  25 rpmRC writeLead(FD_t fd, const struct rpmlead *lead)
  26 {
  27     struct rpmlead l;
  28
  29 /*@-boundswrite@*/
  30     memcpy(&l, lead, sizeof(l));
  31
  32     memcpy(&l.magic, lead_magic, sizeof(l.magic));
  33 /*@=boundswrite@*/
  34     l.type = htons(l.type);
  35     l.archnum = htons(l.archnum);
  36     l.osnum = htons(l.osnum);
  37     l.signature_type = htons(l.signature_type);
  38
  39 /*@-boundswrite@*/
  40     if (Fwrite(&l, 1, sizeof(l), fd) != sizeof(l))
  41         return RPMRC_FAIL;
  42 /*@=boundswrite@*/
  43
  44     return RPMRC_OK;
  45 }
  46
  47 rpmRC readLead(FD_t fd, struct rpmlead *lead)
  48 {
  49 /*@-boundswrite@*/
  50     memset(lead, 0, sizeof(*lead));
  51 /*@=boundswrite@*/
  52     /*@-type@*/ /* FIX: remove timed read */
  53     if (timedRead(fd, (char *)lead, sizeof(*lead)) != sizeof(*lead)) {
  54         rpmError(RPMERR_READ, _("read failed: %s (%d)\n"), Fstrerror(fd),
  55               errno);
  56         return RPMRC_FAIL;
  57     }
  58     /*@=type@*/
  59
  60     if (memcmp(lead->magic, lead_magic, sizeof(lead_magic)))
  61         return RPMRC_FAIL;
  62
  63     lead->type = ntohs(lead->type);
  64     lead->archnum = ntohs(lead->archnum);
  65     lead->osnum = ntohs(lead->osnum);
  66
  67     if (lead->major >= 2)
  68         lead->signature_type = ntohs(lead->signature_type);
  69
  70     return RPMRC_OK;
  71 }