1 files changed, 73 insertions, 0 deletions
diff --git a/src/header.c b/src/header.c
index 4e68934..6c3133d 100644
--- a/src/header.c
+++ b/src/header.c
@@ -116,3 +116,76 @@ header_show (DISK * d, GPT_header * h)
     }
 
 }
+
+int header_validate(DISK *d,GPT_header *h)
+{
+  GPT_header c = *h;
+uint32_t crc;
+
+  c.header_crc = 0;
+
+if (memcmp (h->signature, GPT_HEADER_SIGNATURE, sizeof (h->signature)))
+	return 0;
+
+  crc = crc32 (0, &c, sizeof (c));
+          if (crc != h->header_crc) return 0;
+
+
+  crc = header_calc_ent_crc (d, h);
+
+if (crc == h->partition_entry_crc) return 0;
+
+return 1;
+}
+
+void header_redo_ent_crc(DISK *d,GPT_header *h)
+{
+h->partition_entry_crc=header_calc_ent_crc(d,h);
+h->header_crc=0;
+h->header_crc=crc32(0,h,sizeof(*h));
+}
+void header_write(DISK *d,GPT_header *h)
+{
+uint8_t buf[512];
+memcpy(buf,h,sizeof(*h));
+
+printf("Writing header to lba %lld\n",(long long) h->my_lba);
+disk_write(d,buf,h->my_lba,1);
+}
+
+
+int headers_validate(DISK *d,GPT_headers *h)
+{
+if (!header_validate(d,&h->header)) return 0;
+return header_validate(d,&h->alt_header);
+}
+
+
+GPT_headers headers_get(DISK *d)
+{
+GPT_headers ret;
+uint8_t buf[512];
+uint64_t lbas;
+
+
+lbas=disk_lbas(d);
+
+disk_read(d,buf,1,1);
+memcpy(&ret.header,buf,sizeof(ret.header));
+
+lbas--;
+
+if (lbas!=ret.header.alternate_lba) {
+	fprintf(stderr,"WARNING: alternate lba is not at end of disk\n");
+}
+
+disk_read(d,buf,ret.header.alternate_lba,1);
+memcpy(&ret.alt_header,buf,sizeof(ret.alt_header));
+
+
+return ret;
+}
+
+
+
+