epub.h

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/*
 * SPDX-FileCopyrightText: 2025 Anna-Lena Marx <mail@marx.engineer>
 *
 * SPDX-License-Identifier: MPL-2.0
 */
 
#ifndef _EPUB_H_
#define _EPUB_H_
 
#include <stdint.h>
#include <stddef.h>


#define EPUB_FILE_LEN_MAX 255

#define EPUB_LSDIR_CHARS_MAX 4096

#define EPUB_PAGE_SIZE 1400

#define STATE_FILE "/SD:/.statefile"

typedef struct
{
    size_t number;

    char *title;

    char *author;

    char *entry_point;

    char *root_dir;
} book_entry_t;

typedef struct llist
{
    book_entry_t *book;

    struct llist *next;
} book_list_t;

typedef struct
{
    size_t number;

    char *path;
} chapter_entry_t;

typedef struct dllist
{
    chapter_entry_t *chapter;

    struct dllist *next;

    struct dllist *prev;
} chapter_list_t;

typedef struct
{
    uint16_t num_chapters;

    chapter_list_t *chapter_list;

    chapter_list_t *current_chapter;

    char page[EPUB_PAGE_SIZE];

    char pretty_page[EPUB_PAGE_SIZE];

    char *chapter_filename;

    char *root_dir;

    struct
    {
        // May use title instead of number in future
        char *title;
 
        // size_t book_number;

        size_t chapter;

        size_t file_offset;
    } state;
 
} current_book_t;

int epub_initialize();

book_list_t *epub_get_book_list();

book_entry_t *epub_get_book_entry_for_num(uint16_t number);

book_entry_t *epub_get_book_entry_for_title(char *title);

int epub_open_book(book_entry_t *book);

int epub_restore_book();

char *epub_get_prev_page();

char *epub_get_next_page();

int epub_write_current_book_state();

void epub_get_current_book_state();

#endif