int archwriter_write_volheader(carchwriter *ai)
{
struct s_writebuf *wb=NULL;
cdico *voldico;
assert(ai);
if ((wb=writebuf_alloc())==NULL)
{ msgprintf(MSG_STACK, "writebuf_alloc() failed\n");
return -1;
}
if ((voldico=dico_alloc())==NULL)
{ msgprintf(MSG_STACK, "voldico=dico_alloc() failed\n");
return -1;
}
// prepare header
dico_add_u32(voldico, 0, VOLUMEHEADKEY_VOLNUM, ai->curvol);
dico_add_u32(voldico, 0, VOLUMEHEADKEY_ARCHID, ai->archid);
dico_add_string(voldico, 0, VOLUMEHEADKEY_FILEFORMATVER, FSA_FILEFORMAT);
dico_add_string(voldico, 0, VOLUMEHEADKEY_PROGVERCREAT, FSA_VERSION);
// write header to buffer
if (writebuf_add_header(wb, voldico, FSA_MAGIC_VOLH, ai->archid, FSA_FILESYSID_NULL)!=0)
{ errprintf("archio_write_header() failed\n");
return -1;
}
// write header to file
if (archwriter_write_buffer(ai, wb)!=0)
{ errprintf("archwriter_write_buffer() failed\n");
return -1;
}
dico_destroy(voldico);
writebuf_destroy(wb);
return 0;
}
int archwriter_write_volfooter(carchwriter *ai, bool lastvol)
{
struct s_writebuf *wb=NULL;
cdico *voldico;
assert(ai);
if ((wb=writebuf_alloc())==NULL)
{ errprintf("writebuf_alloc() failed\n");
return -1;
}
if ((voldico=dico_alloc())==NULL)
{ errprintf("voldico=dico_alloc() failed\n");
return -1;
}
// prepare header
dico_add_u32(voldico, 0, VOLUMEFOOTKEY_VOLNUM, ai->curvol);
dico_add_u32(voldico, 0, VOLUMEFOOTKEY_ARCHID, ai->archid);
dico_add_u32(voldico, 0, VOLUMEFOOTKEY_LASTVOL, lastvol);
// write header to buffer
if (writebuf_add_header(wb, voldico, FSA_MAGIC_VOLF, ai->archid, FSA_FILESYSID_NULL)!=0)
{ msgprintf(MSG_STACK, "archio_write_header() failed\n");
return -1;
}
// write header to file
if (archwriter_write_buffer(ai, wb)!=0)
{ msgprintf(MSG_STACK, "archwriter_write_data(size=%ld) failed\n", (long)wb->size);
return -1;
}
dico_destroy(voldico);
writebuf_destroy(wb);
return 0;
}
int archreader_read_header(carchreader *ai, char *magic, cdico **d, bool allowseek, u16 *fsid)
{
s64 curpos;
u16 temp16;
u32 temp32;
u32 archid;
int res;
assert(ai);
assert(d);
assert(fsid);
// init
memset(magic, 0, FSA_SIZEOF_MAGIC);
*fsid=FSA_FILESYSID_NULL;
*d=NULL;
if ((*d=dico_alloc())==NULL)
{ errprintf("dico_alloc() failed\n");
return OLDERR_FATAL;
}
// search for next read header marker and magic (it may be further if corruption in archive)
if ((curpos=lseek64(ai->archfd, 0, SEEK_CUR))<0)
{ sysprintf("lseek64() failed to get the current position in archive\n");
return OLDERR_FATAL;
}
if ((res=archreader_read_data(ai, magic, FSA_SIZEOF_MAGIC))!=FSAERR_SUCCESS)
{ msgprintf(MSG_STACK, "cannot read header magic: res=%d\n", res);
return OLDERR_FATAL;
}
// we don't want to search for the magic if it's a volume header
if (is_magic_valid(magic)!=true && allowseek!=true)
{ errprintf("cannot read header magic: this is not a valid fsarchiver file, or it has been created with a different version.\n");
return OLDERR_FATAL;
}
while (is_magic_valid(magic)!=true)
{
if (lseek64(ai->archfd, curpos++, SEEK_SET)<0)
{ sysprintf("lseek64(pos=%lld, SEEK_SET) failed\n", (long long)curpos);
return OLDERR_FATAL;
}
if ((res=archreader_read_data(ai, magic, FSA_SIZEOF_MAGIC))!=FSAERR_SUCCESS)
{ msgprintf(MSG_STACK, "cannot read header magic: res=%d\n", res);
return OLDERR_FATAL;
}
}
// read the archive id
if ((res=archreader_read_data(ai, &temp32, sizeof(temp32)))!=FSAERR_SUCCESS)
{ msgprintf(MSG_STACK, "cannot read archive-id in header: res=%d\n", res);
return OLDERR_FATAL;
}
archid=le32_to_cpu(temp32);
if (ai->archid) // only check archive-id if it's known (when main header has been read)
{
if (archid!=ai->archid)
{ errprintf("archive-id in header does not match: archid=[%.8x], expected=[%.8x]\n", archid, ai->archid);
return OLDERR_MINOR;
}
}
// read the filesystem id
if ((res=archreader_read_data(ai, &temp16, sizeof(temp16)))!=FSAERR_SUCCESS)
{ msgprintf(MSG_STACK, "cannot read filesystem-id in header: res=%d\n", res);
return OLDERR_FATAL;
}
*fsid=le16_to_cpu(temp16);
// read the dico of the header
if ((res=archreader_read_dico(ai, *d))!=FSAERR_SUCCESS)
{ msgprintf(MSG_STACK, "imgdisk_read_dico() failed\n");
return res;
}
return FSAERR_SUCCESS;
}
