fat.c

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/*****************************************************************************************
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 $Id: ubixfs.c 79 2016-01-11 16:21:27Z reddawg $
 
 *****************************************************************************************/
 
#include <vfs/vfs.h>
#include <ubixos/sched.h>
#include <ubixos/kpanic.h>
#include <ubixos/exec.h>
#include <lib/kmalloc.h>
#include <string.h>
#include <lib/kprintf.h>
#include <assert.h>
 
#include "fat_filelib.h"
#include "fat_access.h"
 
fileDescriptor_t *_fd;
struct vfs_mountPoint *_mp;
 
int media_read(unsigned long sector, unsigned char *buffer, unsigned long sector_count) {
  _mp->device->devInfo->read(_mp->device->devInfo->info, buffer, sector, sector_count);
 
  return 1;
}
 
int media_write(unsigned long sector, unsigned char *buffer, unsigned long sector_count) {
  _mp->device->devInfo->write(_mp->device->devInfo->info, buffer, sector, sector_count);
 
  return 1;
}
 
int fat_initialize(struct vfs_mountPoint *mp) {
  FL_FILE *file;
  _mp = mp;
  // Attach media access functions to library
  if (fl_attach_media(media_read, media_write) != FAT_INIT_OK) {
    kprintf("ERROR: Media attach failed\n");
    return (0);
  }
 
  // List root directory
  //fl_listdirectory("/bin/");
 
  // Delete File
  //if (fl_remove("/file.bin") < 0)
  //  kprintf("ERROR: Delete file failed\n");
 
  // Create File
  file = fl_fopen("/file.bin", "w");
  unsigned char data[] = {
      'a',
      '\n',
      'b',
      '\n',
      'c',
      '\n' };
  if (file) {
    // Write some data
    if (fl_fwrite(data, 1, sizeof(data), file) != sizeof(data))
      kprintf("ERROR: Write file failed\n");
  }
  else
    kprintf("ERROR: Create file failed\n");
 
  // Close file
  fl_fclose(file);
 
  return (1);
}
 
int read_fat(fileDescriptor_t *fd, char *data, off_t offset, long size) {
  FL_FILE *_file = (FL_FILE*) fd->res;
 
  if (size == 0) {
    kprintf("ZERO: %s", _file->filename);
    return (-1);
  }
 
  //kprintf("[Offset(%s): %ld:%ld]", _file->filename, offset, size);
  if (fl_fseek(_file, offset & 0xFFFFFFFF, 0) != 0)
    kprintf("SEEK FAILED!");
 
  size = fl_fread(data, size, 1, _file);
  if (size >= 0)
    fd->offset = offset + size;
 
  /* Return */
  return (size);
}
 
int write_fat(fileDescriptor_t *fd, char *data, off_t offset, long size) {
  FL_FILE *_file = (FL_FILE*) fd->res;
 
  kprintf("Writing: %i[%i]\n", size, offset);
  // XXX this is not supposed to happen fl_fseek(_file, offset, 0);
 
  if (fl_fwrite(data, 1, size, _file) != size)
    kprintf("ERROR: Write file failed\n");
 
  kprintf("Wrote: %i\n", size);
 
  /* Return */
  return (size);
}
 
int open_fat(const char *file, fileDescriptor_t *fd) {
  FL_FILE *_file = 0x0;
 
  assert(fd);
  assert(fd->mp);
  assert(fd->mp->device);
  assert(fd->mp->device->devInfo);
  assert(fd->mp->device->devInfo->read);
  assert(file);
 
  //kprintf("File: %s, ", file);
  //kprintf("Mode: 0x%X\n", fd->mode);
 
  if ((fd->mode & 0x1) == 0x1) {
    _file = fl_fopen(file, "r");
  }
  else if ((fd->mode & 0x2) == 0x2) {
    if ((fd->mode & 0x8) == 0x8) {
      _file = fl_fopen(file, "a");
    }
    else {
      _file = fl_fopen(file, "w");
      //kprintf("open for writing");
    }
  }
  else
    kprintf("Invalid Mode?");
 
  if (!_file) {
    return (0x0);
  }
  else {
    fd->offset = 0;
    fd->res = _file;
    fd->perms = 0x1;
    fd->size = _file->filelength;
    fd->ino = _file->startcluster;
  }
 
  return (0x1);
}
 
int unlink_fat() {
  return (0);
}
 
int mkdir_fat() {
  return (0);
}
 
int fat_init() {
  // Initialise File IO Library
  fl_init();
 
  /* Set up our file system structure */
  struct fileSystem ubixFileSystem = {
      NULL, /* prev        */
      NULL, /* next        */
      (void*) fat_initialize, /* vfsInitFS   */
      (void*) read_fat, /* vfsRead     */
      (void*) write_fat, /* vfsWrite    */
      (void*) open_fat, /* vfsOpenFile */
      (void*) unlink_fat, /* vfsUnlink   */
      (void*) mkdir_fat, /* vfsMakeDir  */
      NULL, /* vfsRemDir   */
      NULL, /* vfsSync     */
      0xFA /* vfsType     */
  }; /* ubixFileSystem */
 
  /* Add UbixFS */
  if (vfsRegisterFS(ubixFileSystem) != 0x0) {
    kpanic("Unable To Enable UbixFS");
    return (0x1);
  }
 
  /* Return */
  return (0x0);
}