Espresso 0.0.2c

include/fs/ekfs.h

@@ -0,0 +1,37 @@
+//#ifndef _ESPRESSO_KERNEL_FS_H
+#if 0
+#define _ESPRESSO_KERNEL_FS_H
+
+#include <types.h>
+
+#define EKFS_FILENAME_MAX_LEN 64
+
+enum {
+  EKFS_E_FILETOOSMALL = -16;
+};
+
+struct ekfs_inode {
+  char i_name[EKFS_FILENAME_MAX_LEN];
+
+  uint64_t i_start; /* LBA48 */
+  size_t i_len; /* rounded up to the nearest multiple of 512 */
+} __attribute__((packed));
+
+struct ekfs_ops {
+  int (*read)(struct ekfs_file*, void*, size_t);
+  int (*write)(struct ekfs_file*, void*, size_t);
+};
+
+struct ekfs_file {
+  struct ekfs_inode* f_inode;
+
+  size_t f_offset;
+  size_t f_refcount;
+
+  struct ekfs_ops f_ops;
+};
+
+
+int ekfs_read(struct ekfs_file* __f, void* __b, size_t __l);
+
+#endif

include/fs/fat16.h

@@ -0,0 +1,78 @@
+#ifndef _FAT16_H
+#define _FAT16_H
+
+#include <stdint.h>
+#include <string.h>
+#include <ctype.h>
+
+#define FAT16_MAX_FILENAME 12 /* 8.3 + null */
+#define SECTOR_SIZE 512
+
+typedef struct {
+  uint16_t bytes_per_sector;
+  uint8_t sectors_per_cluster;
+  uint16_t reserved_sector_count;
+  uint8_t num_fats;
+  uint16_t root_entry_count;
+  uint16_t total_sectors_16;
+  uint16_t sectors_per_fat;
+  uint32_t fat_start_lba;
+  uint32_t root_dir_lba;
+  uint32_t data_start_lba;
+  uint32_t total_sectors;
+} fat16_fs_t;
+
+typedef struct {
+  char name[FAT16_MAX_FILENAME]; /* 8.3 format */
+  uint8_t attr;
+  uint16_t first_cluster;
+  uint32_t size;
+} fat16_file_t;
+
+int fat16_mount(uint8_t drive);
+
+int fat16_find_file(const char* name, fat16_file_t* out_file);
+
+int fat16_create_file(const char* name, fat16_file_t* out_file);
+int fat16_delete_file(const char* filename);
+
+int fat16_read_file(fat16_file_t* file, void* buffer);
+int fat16_write_file(fat16_file_t* file, const void* buffer, uint32_t size);
+
+
+/*
+  Small helper function that converts a normal filename like "test.txt" into FAT16 8.3 uppercase format padded with spaces.
+  This makes creating and writing files much easier.
+*/
+static void filename_to_83(const char* input, char out[12])
+{
+  memset(out, ' ', 11);
+  out[11] = '\0';
+
+  /* Find dot */
+  const char* dot = strchr(input, '.');
+  size_t name_len = dot ? (size_t) (dot - input) : strlen(input);
+  
+  if (name_len > 8)
+  {
+    name_len = 8;
+  }
+  
+  for (size_t i = 0; i < name_len; i++)
+  {
+    out[i] = toupper((unsigned char)input[i]);
+  }
+
+  if (dot)
+  {
+    size_t ext_len = strlen(dot + 1);
+    if (ext_len > 3) ext_len = 3;
+    for (size_t i = 0; i < ext_len; i++)
+    {
+      out[8 + i] = toupper((unsigned char)dot[1 + i]);
+    }
+  }
+}
+
+
+#endif