lib/rpmlead.c

   1 #include <netinet/in.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4 #include <unistd.h>
   5 #include <string.h>
   6 #include <errno.h>
   7
   8 #include "rpmerr.h"
   9 #include "rpmlead.h"
  10
  11 /* The lead needs to be 8 byte aligned */
  12
  13 int writeLead(int fd, struct rpmlead *lead)
  14 {
  15     struct rpmlead l;
  16
  17     memcpy(&l, lead, sizeof(*lead));
  18
  19     l.magic[0] = RPMLEAD_MAGIC0;
  20     l.magic[1] = RPMLEAD_MAGIC1;
  21     l.magic[2] = RPMLEAD_MAGIC2;
  22     l.magic[3] = RPMLEAD_MAGIC3;
  23
  24     l.type = htons(l.type);
  25     l.archnum = htons(l.archnum);
  26     l.osnum = htons(l.osnum);
  27     l.signature_type = htons(l.signature_type);
  28
  29     write(fd, &l, sizeof(l));
  30
  31     return 0;
  32 }
  33
  34 int readLead(int fd, struct rpmlead *lead)
  35 {
  36     if (read(fd, lead, sizeof(*lead)) != sizeof(*lead)) {
  37         error(RPMERR_READERROR, "read failed: %s (%d)", strerror(errno),
  38               errno);
  39         return 1;
  40     }
  41
  42     lead->type = ntohs(lead->type);
  43     lead->archnum = ntohs(lead->archnum);
  44     lead->osnum = ntohs(lead->osnum);
  45
  46     if (lead->major >= 2)
  47         lead->signature_type = ntohs(lead->signature_type);
  48
  49     return 0;
  50 }
  51