1 files changed, 58 insertions, 0 deletions
diff --git a/src/kernel/fat12.c b/src/kernel/fat12.c
new file mode 100644
index 0000000..ef09116
--- /dev/null
+++ b/src/kernel/fat12.c
@@ -0,0 +1,58 @@
+/*
+Copyright 2019 Benji Dial
+
+Permission to use, copy, modify, and/or distribute this
+software for any purpose with or without fee is hereby
+granted, provided that the above copyright notice and this
+permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS
+ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
+EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+OF THIS SOFTWARE.
+*/
+
+#include "iso9660.h"
+#include "diskio.h"
+#include "files.h"
+#include "mem.h"
+
+bool iso_9660_parse_ph(uint8_t dn, uint8_t pn, uint32_t sector, uint8_t *buffer) {
+  uint32_t s = sector + 64;
+  read_sectors_t rsf = get_read_sectors_function(dn);
+  do {
+    rsf(drives[dn].number, s, 4, buffer);
+    if ((*buffer == 255) || (*(uint32_t *)&buffer[1] != 0x30304443) ||
+      (buffer[5] != (uint8_t)'1'))
+      return false;
+    s += 4;
+  } while (*buffer != PRIM_VOLUME);
+  part_info[dn].partition_types[pn] = ISO_9660;
+  part_info[dn].partition_offsets[pn] = sector;
+  struct iso_9660_cache *cache = allocate_block(sizeof(struct iso_9660_cache), KERNEL);
+  struct iso_9660_primary_vd *as_vd = (struct iso_9660_primary_vd *)buffer;
+  part_info[dn].partition_cache[pn] = cache;
+  if ((cache->block_size = as_vd->block_size) & ~0x01ff) {
+    part_info[dn].partition_sizes[pn] =
+      (as_vd->block_size >> 9) * as_vd->size;
+    cache->path_table_sector =
+      (as_vd->block_size >> 9) * as_vd->path_table_block;
+    cache->optional_path_table_sector =
+      (as_vd->block_size >> 9) * as_vd->optional_path_table_block;
+  }
+  else {
+    part_info[dn].partition_sizes[pn] =
+      (as_vd->block_size * as_vd->size) >> 9;
+    cache->path_table_sector =
+      (as_vd->block_size * as_vd->path_table_block) >> 9;
+    cache->optional_path_table_sector =
+      (as_vd->block_size * as_vd->optional_path_table_block) >> 9;
+  }
+  cache->path_table_size = as_vd->path_table_size;
+  return true;
+}
+\ No newline at end of file