br.c

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#include <stdio.h>
 
#include "file.h"
#include "nls.h"
#include "br.h"
 
static unsigned long ulBytesPerSector = 512;
 
void set_bytes_per_sector(unsigned long ulValue)
{
   ulBytesPerSector = ulValue;
   if ((ulBytesPerSector < 512) || (ulBytesPerSector > 65536))
      ulBytesPerSector = 512;
} /* set_bytes_per_sector */
 
uint32_t read_windows_disk_signature(FILE *fp)
{
   uint32_t tWDS;
   if(!read_data(fp, 0x1b8, &tWDS, 4))
      return 0;
   return tWDS;
} /* read_windows_disk_signature */
 
int write_windows_disk_signature(FILE *fp, uint32_t tWDS)
{
   return write_data(fp, 0x1b8, &tWDS, 4);
} /* write_windows_disk_signature */
 
uint16_t read_mbr_copy_protect_bytes(FILE *fp)
{
   uint16_t tOut;
   if(!read_data(fp, 0x1bc, &tOut, 2))
      return 0xffff;
   return tOut;
} /* read_mbr_copy_protect_bytes */
 
const char *read_mbr_copy_protect_bytes_explained(FILE *fp)
{
   uint16_t t = read_mbr_copy_protect_bytes(fp);
   switch(t)
   {
      case 0:
     return _("not copy protected");
      case 0x5a5a:
     return _("copy protected");
      default:
     return _("unknown value");
   }
} /* read_mbr_copy_protect_bytes_explained */
 
int is_br(FILE *fp)
{
   /* A "file" is probably some kind of boot record if it contains the magic
      chars 0x55, 0xAA at position 0x1FE */
   unsigned char aucRef[] = {0x55, 0xAA};
 
   return contains_data(fp, 0x1FE, aucRef, sizeof(aucRef)); 
} /* is_br */
 
int is_lilo_br(FILE *fp)
{
   /* A "file" is probably a LILO boot record if it contains the magic
      chars LILO at position 0x6 or 0x2 for floppies */
   unsigned char aucRef[] = {'L','I','L','O'};
 
   return ( contains_data(fp, 0x6, aucRef, sizeof(aucRef)) ||
        contains_data(fp, 0x2, aucRef, sizeof(aucRef)) ); 
} /* is_lilo_br */
 
int is_dos_mbr(FILE *fp)
{
   #include "mbr_dos.h"
 
   return
      contains_data(fp, 0x0, mbr_dos_0x0, sizeof(mbr_dos_0x0)) &&
      is_br(fp);
} /* is_dos_mbr */
 
int is_dos_f2_mbr(FILE *fp)
{
   #include "mbr_dos_f2.h"
 
   return
      contains_data(fp, 0x0, mbr_dos_f2_0x0, sizeof(mbr_dos_f2_0x0)) &&
      is_br(fp);
} /* is_dos_f2_mbr */
 
int is_95b_mbr(FILE *fp)
{
   #include "mbr_95b.h"
 
   return
      contains_data(fp, 0x0,   mbr_95b_0x0,   sizeof(mbr_95b_0x0)) &&
      contains_data(fp, 0x0e0, mbr_95b_0x0e0, sizeof(mbr_95b_0x0e0)) &&
      is_br(fp);
} /* is_95b_mbr */
 
int is_2000_mbr(FILE *fp)
{
   #include "mbr_2000.h"
 
   return
      contains_data(fp, 0x0, mbr_2000_0x0, sizeof(mbr_2000_0x0)) &&
      is_br(fp);
} /* is_2000_mbr */
 
int is_vista_mbr(FILE *fp)
{
   #include "mbr_vista.h"
 
   return
      contains_data(fp, 0x0, mbr_vista_0x0, sizeof(mbr_vista_0x0)) &&
      is_br(fp);
} /* is_vista_mbr */
 
int is_win7_mbr(FILE *fp)
{
   #include "mbr_win7.h"
 
   return
      contains_data(fp, 0x0, mbr_win7_0x0, sizeof(mbr_win7_0x0)) &&
      is_br(fp);
} /* is_win7_mbr */
 
int is_rufus_mbr(FILE *fp)
{
   #include "mbr_rufus.h"
 
   return
      contains_data(fp, 0x0, mbr_rufus_0x0, sizeof(mbr_rufus_0x0)) &&
      is_br(fp);
} /* is_rufus_mbr */
 
int is_reactos_mbr(FILE *fp)
{
   #include "mbr_reactos.h"
 
   return
      contains_data(fp, 0x0, mbr_reactos_0x0, sizeof(mbr_reactos_0x0)) &&
      is_br(fp);
} /* is_reactos_mbr */
 
int is_grub4dos_mbr(FILE *fp)
{
   #include "mbr_grub.h"
 
   return
      contains_data(fp, 0x0, mbr_grub_0x0, sizeof(mbr_grub_0x0)) &&
      is_br(fp);
} /* is_grub_mbr */
 
int is_grub2_mbr(FILE *fp)
{
   #include "mbr_grub2.h"
 
   return
      contains_data(fp, 0x0, mbr_grub2_0x0, sizeof(mbr_grub2_0x0)) &&
      is_br(fp);
} /* is_grub2_mbr */
 
int is_kolibrios_mbr(FILE *fp)
{
   #include "mbr_kolibri.h"
 
   return
      contains_data(fp, 0x0, mbr_kolibri_0x0, sizeof(mbr_kolibri_0x0)) &&
      is_br(fp);
} /* is_kolibri_mbr */
 
int is_syslinux_mbr(FILE *fp)
{
   #include "mbr_syslinux.h"
 
   return
      contains_data(fp, 0x0, mbr_syslinux_0x0, sizeof(mbr_syslinux_0x0)) &&
      is_br(fp);
} /* is_syslinux_mbr */
 
int is_syslinux_gpt_mbr(FILE *fp)
{
   #include "mbr_gpt_syslinux.h"
 
   return
      contains_data(fp, 0x0, mbr_gpt_syslinux_0x0,
            sizeof(mbr_gpt_syslinux_0x0)) &&
      is_br(fp);
} /* is_syslinux_gpt_mbr */
 
int is_zero_mbr(FILE *fp)
{
   #include "mbr_zero.h"
 
   return
      contains_data(fp, 0x0, mbr_zero_0x0, sizeof(mbr_zero_0x0));
    /* Don't bother to check 55AA signature */
} /* is_zero_mbr */
 
int is_zero_mbr_not_including_disk_signature_or_copy_protect(FILE *fp)
{
   #include "mbr_zero.h"
 
   return
      contains_data(fp, 0x0, mbr_zero_0x0, 0x1b8);
} /* is_zero_mbr_not_including_disk_signature_or_copy_protect */
 
/* Handle nonstandard sector sizes (such as 4K) by writing
   the boot marker at every 512-2 bytes location */
static int write_bootmark(FILE *fp)
{
   unsigned char aucRef[] = {0x55, 0xAA};
   unsigned long pos = 0x1FE;
 
   for (pos = 0x1FE; pos < ulBytesPerSector; pos += 0x200) {
      if (!write_data(fp, pos, aucRef, sizeof(aucRef)))
            return 0;
   }
   return 1;
}
 
int write_dos_mbr(FILE *fp)
{
   #include "mbr_dos.h"
 
   return
      write_data(fp, 0x0, mbr_dos_0x0, sizeof(mbr_dos_0x0)) &&
      write_bootmark(fp);
} /* write_dos_mbr */
 
int write_95b_mbr(FILE *fp)
{
   #include "mbr_95b.h"
 
   return
      write_data(fp, 0x0,   mbr_95b_0x0, sizeof(mbr_95b_0x0)) &&
      write_data(fp, 0x0e0, mbr_95b_0x0e0, sizeof(mbr_95b_0x0e0)) &&
      write_bootmark(fp);
} /* write_95b_mbr */
 
int write_2000_mbr(FILE *fp)
{
   #include "mbr_2000.h"
 
   return
      write_data(fp, 0x0, mbr_2000_0x0, sizeof(mbr_2000_0x0)) &&
      write_bootmark(fp);
} /* write_2000_mbr */
 
int write_vista_mbr(FILE *fp)
{
   #include "mbr_vista.h"
 
   return
      write_data(fp, 0x0, mbr_vista_0x0, sizeof(mbr_vista_0x0)) &&
      write_bootmark(fp);
} /* write_vista_mbr */
 
int write_win7_mbr(FILE *fp)
{
   #include "mbr_win7.h"
 
   return
      write_data(fp, 0x0, mbr_win7_0x0, sizeof(mbr_win7_0x0)) &&
      write_bootmark(fp);
} /* write_win7_mbr */
 
int write_rufus_mbr(FILE *fp)
{
   #include "mbr_rufus.h"
 
   return
      write_data(fp, 0x0, mbr_rufus_0x0, sizeof(mbr_rufus_0x0)) &&
      write_bootmark(fp);
} /* write_rufus_mbr */
 
int write_reactos_mbr(FILE *fp)
{
   #include "mbr_reactos.h"
 
   return
      write_data(fp, 0x0, mbr_reactos_0x0, sizeof(mbr_reactos_0x0)) &&
      write_bootmark(fp);
} /* write_reactos_mbr */
 
int write_kolibrios_mbr(FILE *fp)
{
   #include "mbr_kolibri.h"
 
   return
      write_data(fp, 0x0, mbr_kolibri_0x0, sizeof(mbr_kolibri_0x0)) &&
      write_bootmark(fp);
} /* write_kolibri_mbr */
 
int write_syslinux_mbr(FILE *fp)
{
   #include "mbr_syslinux.h"
 
   return
      write_data(fp, 0x0, mbr_syslinux_0x0, sizeof(mbr_syslinux_0x0)) &&
      write_bootmark(fp);
} /* write_syslinux_mbr */
 
int write_syslinux_gpt_mbr(FILE *fp)
{
   #include "mbr_gpt_syslinux.h"
 
   return
      write_data(fp, 0x0, mbr_gpt_syslinux_0x0, sizeof(mbr_gpt_syslinux_0x0)) &&
      write_bootmark(fp);
} /* write_syslinux_gpt_mbr */
 
int write_grub4dos_mbr(FILE *fp)
{
   #include "mbr_grub.h"
 
   return
      write_data(fp, 0x0, mbr_grub_0x0, sizeof(mbr_grub_0x0)) &&
      write_bootmark(fp);
}
 
int write_grub2_mbr(FILE *fp)
{
   #include "mbr_grub2.h"
 
   return
      write_data(fp, 0x0, mbr_grub2_0x0, sizeof(mbr_grub2_0x0)) &&
      write_bootmark(fp);
}
 
int write_zero_mbr(FILE *fp)
{
   #include "mbr_zero.h"
 
   return
      write_data(fp, 0x0, mbr_zero_0x0, sizeof(mbr_zero_0x0)) &&
      write_bootmark(fp);
} /* write_zero_mbr */