From 7c7fd36bea1eac4d0fa7bd628a53fff7d2e60917 Mon Sep 17 00:00:00 2001
From: Benji Dial <Benji3.141@gmail.com>
Date: Fri, 27 Dec 2019 18:49:11 -0500
Subject: doing iso9660 before gpt, making partition detection expandable

---
 src/kernel/files.c | 39 ++++++++++++++++++++++++++++++++-------
 1 file changed, 32 insertions(+), 7 deletions(-)

(limited to 'src/kernel/files.c')

diff --git a/src/kernel/files.c b/src/kernel/files.c
index b8a9061..8064518 100644
--- a/src/kernel/files.c
+++ b/src/kernel/files.c
@@ -19,11 +19,21 @@ OF THIS SOFTWARE.
 
 #include "files.h"
 #include "diskio.h"
-#include "gpt.h"
+#include "iso9660.h"
+#include "mem.h"
+
+bool (*const parse_pts[N_PT_FORMATS])(uint8_t dn, uint8_t *buffer) = {
+  //&gpt_parse_pt,
+  //&mbr_parse_pt
+};
+
+bool (*const parse_phs[N_FS_FORMATS])(uint8_t dn, uint32_t sector, uint8_t *buffer) = {
+  &iso_9660_parse_ph
+};
 
 uint8_t working_drive;
 uint8_t working_part;
-uint8_t buffer[1024];
+uint8_t buffer[2048];
 
 void set_working_drive(uint8_t name, uint8_t part) {
   if ((name >= (uint8_t)'a') && (name <= (uint8_t)'z') &&
@@ -74,13 +84,28 @@ uint32_t read_line_file(uint16_t handle, uint32_t max, void *buffer) {
 void detect_disk_parts(uint8_t drive) {
   if ((drive >= (uint8_t)'a') && (drive <= (uint8_t)'z')) {
     uint8_t dn = (drive & 0x1f) - 1;
+    for (uint8_t i = 0; i < part_info[dn].n_partitions; ++i)
+      if (part_info[dn].partition_cache[i])
+        deallocate_block(part_info[dn].partition_cache[i]);
     update_status(dn);
     if (drives[dn].flags & (PRESENT | DISK_IN)) {
-      read_sectors(dn, 0, 2, buffer);
-      if ((*(uint32_t *)&buffer[0x200] == 0x20494645) &&//EFI
-          (*(uint32_t *)&buffer[0x204] == 0x54524150))  //PART
-        part_info[dn].format = gpt_parse_pt(dn, buffer) ? GPT : UNKNOWN;
-      ;
+      /*ISO 9660 often comes with a dummy MBR*/
+      if (iso_9660_parse_ph(dn, 0, buffer)) {
+        part_info[dn].format = DIRECT;
+        part_info[dn].n_partitions = 1;
+        return;
+      }
+      for (uint8_t ptt = 0; ptt < N_PT_FORMATS; ++ptt)
+        if (parse_pts[ptt](dn, buffer))
+          return;
+      for (uint8_t fst = 0; fst < N_FS_FORMATS; ++fst)
+        if (parse_phs[fst](dn, 0, buffer)) {
+          part_info[dn].format = DIRECT;
+          part_info[dn].n_partitions = 1;
+          return;
+        }
+      part_info[dn].format = UNKNOWN;
+      part_info[dn].n_partitions = 0;
     }
     else {
       part_info[dn].format = NOT_PRESENT;
-- 
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