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#ifdef HAVE_CONFIG_H

# include "config.h"

#endif

#ifndef EMBED

# include <assert.h>

# include <string.h>

#else

# warning assert checking disabled

# define assert(x)

#endif

#include "fsyst.h"

/* Return next file.  */

inline struct file_struct *

next_file (struct file_struct *file) {

  return (struct file_struct *)((unsigned char *)file + swap(file->length));

}

/* Returns file, that holds track number.  */

struct file_struct *

find_track_no (int no, struct file_struct *root) {

  assert(swap(root->type) == FT_ROOT);

  while (swap(root->type) != FT_END) {

    if (swap(root->type) == FT_TRACK_NO && swap(root->data[0]) == no)

      return root;

    root = next_file (root);

  }

  return 0;

}

/* Returns track name from file struct, pointing at FT_TRACK_NO.  */

char *

track_name (struct file_struct *fs) {

  assert(swap(fs->type) == FT_TRACK_NO);

  fs = next_file (fs);

  if (swap(fs->type) == FT_TRACK_NAME)

    return (char *)&fs->data[0];

  else

    return "";

}

/* Returns track data from file struct, pointing at FT_TRACK_NO.  */

struct file_struct *

track_data (struct file_struct *fs) {

  assert(swap(fs->type) == FT_TRACK_NO);

  fs = next_file (fs);

  if (swap(fs->type) == FT_TRACK_NAME)

    fs = next_file (fs);

  assert (swap(fs->type) == FT_TRACK_DATA);

  return fs;

}

/* Finds last record.  */

inline struct file_struct *

end_file (struct file_struct *root) {

  assert(swap(root->type) == FT_ROOT);

  while (swap(root->type) != FT_END)

    root = next_file (root);

  return root;

}

/* Adds file to the end of file list.  Returns new file address, if

   sucessful, otherwise NULL.  */

struct file_struct *

add_file (struct file_struct *root, struct file_struct *file) {

  struct file_struct *end = end_file (root);

  memcpy (end, file, file->length);

  file = end;

  end = next_file (end);

  end->type = swap(FT_END);

  end->length = swap(0);

  return file;

}

/* Initializes filesystem at root.  */

void

init_fsyst (struct file_struct *root) {

  root->type = swap(FT_ROOT);

  root->length = swap(sizeof (struct file_struct) - sizeof (unsigned int));

  root = next_file (root);

  root->type = swap(FT_END);

  root->length = swap(0);

}

#ifndef EMBED

unsigned int swap (unsigned int x) {

  return (x & 0xFF) << 24

    | (x & 0xFF00) << 8

    | (x & 0xFF0000) >> 8

    | (x & 0xFF000000) >> 24;

}

#endif