First stage of implementation of GPT production.

The writer class for the backup GPT is not implemented yet.

libisofs/system_area.h

@@ -126,4 +126,68 @@ void iso_random_uuid(Ecma119Image *t, uint8_t uuid[16]);
 void iso_random_8byte(Ecma119Image *t, uint8_t result[8]);
 
 
+/* The parameter struct for production of a single GPT entry.
+   See also the partial GPT description in doc/boot_sectors.txt.
+   The list of entries is stored in Ecma119Image.gpt_req.
+   The GPT header block at byte 0x200 will get produced automatically.
+   The GPT entries will be stored after the Apple Partition Map, if such
+   gets generated too. Both partition descriptions must fit into the 32 KiB
+   of the ISO 9660 System Area.
+
+   GPT can be combined with APM only if (Ecma119Image.apm_block_size > 512).
+   Otherwise, block 1 of APM and GPT header block would collide.
+   So Ecma119Image.apm_block_size is set automatically to 2048 if at least
+   one GPT entry is requested. (One could try 1024 ...).
+*/
+struct iso_gpt_partition_request {
+
+    /* Always given in blocks of 2 KiB.
+       Written to the ISO image in blocks of 512.
+    */
+    uint32_t start_block;
+    uint32_t block_count;
+
+    /* The registered GUID which defines the partition type */
+    uint8_t type_guid[16];
+
+    /* An individual GUID which shall be unique to the partition.
+       If the caller submits 0...0 then a (weak) random uuid will be generated.
+    */
+    uint8_t partition_guid[16];
+
+    /* bit0= "System Partition" Do not alter,
+       bit2= Legacy BIOS bootable (MBR partition type 0x80)
+       bit60= read-only
+    */
+    uint64_t flags;
+
+    /* Fill with text encoded as UTF-16LE.
+       All 72 bytes get copied to the system area.
+       Take care to pad up short strings by 0.
+    */
+    uint8_t name[72];
+};
+
+/* Copies the content of req and registers it in t.gpt_req[].
+   I.e. after the call the submitted storage of req can be disposed or re-used.
+   Submit 0 as value flag.
+*/
+int iso_register_gpt_entry(Ecma119Image *t,
+                           struct iso_gpt_partition_request *req, int flag);
+
+/* Convenience frontend for iso_register_gpt_entry().
+   name has to be already encoded as UTF-16LE.
+*/
+int iso_quick_gpt_entry(Ecma119Image *t, 
+                        uint32_t start_block, uint32_t block_count, 
+                        uint8_t type_guid[16], uint8_t partition_guid[16],
+                        uint64_t flags, uint8_t name[72]);
+
+
+/* Internal helper that will be used by system_area.c and make_isohybrid_mbr.c
+*/
+int iso_write_gpt_header_block(Ecma119Image *t, uint32_t img_blocks,
+                               uint8_t *buf, uint32_t max_entries,
+                               uint32_t part_start, uint32_t p_arr_crc);
+
 #endif /* SYSTEM_AREA_H_ */