From 0ba991750314310a5e53b0d8135aef5b1352b261 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Wed, 20 Nov 2019 22:17:48 +0100
Subject: Began two-stage hdd bootloader and os installer

---
 src/kernel/fs/iso9660/iso9660.c | 60 +++++++++++++++++++++++++++++++++++++++++
 src/kernel/fs/iso9660/iso9660.h | 22 +++++++++++++++
 2 files changed, 82 insertions(+)
 create mode 100644 src/kernel/fs/iso9660/iso9660.c
 create mode 100644 src/kernel/fs/iso9660/iso9660.h

(limited to 'src/kernel/fs/iso9660')

diff --git a/src/kernel/fs/iso9660/iso9660.c b/src/kernel/fs/iso9660/iso9660.c
new file mode 100644
index 0000000..728d3cb
--- /dev/null
+++ b/src/kernel/fs/iso9660/iso9660.c
@@ -0,0 +1,60 @@
+#include <stdint.h>
+#include <kernel/lib/lib.h>
+#include <kernel/fs/atapi_pio.h>
+#include <kernel/fs/iso9660/iso9660.h>
+#include <kernel/lib/alloc.h>
+
+struct ISO9660_entity *ISO9660_get(char **dirs, uint8_t dirs_sz) {
+    ATAPI_read(1, 0x10);
+    uint32_t last_len = *(uint32_t *) (
+            ATAPI_PIO_BUFFER +
+            ISO9660_ROOT_RECORD_OFFSET +
+            ISO9660_DIR_EAR_LENGTH
+    );
+    uint32_t last_LBA = *(uint32_t *) (
+            ATAPI_PIO_BUFFER +
+            ISO9660_ROOT_RECORD_OFFSET +
+            ISO9660_DIR_EAR_LBA
+    );
+
+    for (uint8_t dirs_i = 0; dirs_i < dirs_sz; dirs_i++) {
+        ATAPI_read((last_len % 2048 != 0) + (last_len / 2048), last_LBA);
+
+        uint8_t found = 0;
+        for (uint32_t i = 0; i < last_len && !found;) {
+            if (!*(uint8_t *) (ATAPI_PIO_BUFFER + i + ISO9660_DIR_RECORD_LENGTH))
+                break;
+
+            char *filename = (char *) (ATAPI_PIO_BUFFER + i + ISO9660_DIR_FILENAME);
+
+            for (uint32_t j = 0; j < ISO9660_DIR_FILENAME_LENGTH; j++) {
+                if (filename[j] == ';') {
+                    filename[j] = 0;
+                    break;
+                }
+            }
+
+            if (strcmp(dirs[dirs_i], filename) == 0) {
+                found = 1;
+                last_LBA = *(uint32_t *) (ATAPI_PIO_BUFFER + i + ISO9660_DIR_EAR_LBA);
+                last_len = *(uint32_t *) (ATAPI_PIO_BUFFER + i + ISO9660_DIR_EAR_LENGTH);
+            } else {
+                i += *(uint8_t *) (ATAPI_PIO_BUFFER + i + ISO9660_DIR_RECORD_LENGTH);
+            }
+        }
+
+        if (!found) {
+            return (struct ISO9660_entity *) 0;
+        }
+    }
+
+    struct ISO9660_entity *ret = (struct ISO9660_entity *) kmalloc(sizeof(struct ISO9660_entity));
+    ret->LBA = last_LBA;
+    ret->length = last_len;
+    return ret;
+}
+
+uint8_t *ISO9660_read(struct ISO9660_entity *entity) {
+    ATAPI_read((entity->length % 2048 != 0) + (entity->length / 2048), entity->LBA);
+    return (uint8_t *) ATAPI_PIO_BUFFER;
+}
\ No newline at end of file
diff --git a/src/kernel/fs/iso9660/iso9660.h b/src/kernel/fs/iso9660/iso9660.h
new file mode 100644
index 0000000..3de5d1a
--- /dev/null
+++ b/src/kernel/fs/iso9660/iso9660.h
@@ -0,0 +1,22 @@
+#ifndef MELVIX_ISO9660_H
+#define MELVIX_ISO9660_H
+
+#define ISO9660_ROOT_RECORD_OFFSET 156
+#define ISO9660_DIR_RECORD_LENGTH 0
+#define ISO9660_DIR_EAR_LBA 2
+#define ISO9660_DIR_EAR_LENGTH 10
+#define ISO9660_DIR_FILENAME_LENGTH 32
+#define ISO9660_DIR_FILENAME 33
+
+#include <stdint.h>
+
+struct ISO9660_entity {
+    uint32_t LBA;
+    uint32_t length;
+};
+
+struct ISO9660_entity *ISO9660_get(char **dirs, uint8_t dirs_sz);
+
+uint8_t *ISO9660_read(struct ISO9660_entity *entity);
+
+#endif
-- 
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