bookmark.c

编译后直接运行的ＭＰ３播放器全部Ｃ语言源代码 一个包含FAT文件系统、系统引导 Boot、FLASH Driver等内容的

    while (read_line(bookmark_file, global_read_buffer,
                     sizeof(global_read_buffer)))
    {
        /* The MRB has a max of MAX_BOOKMARKS in it */
        /* This keeps it from getting too large */
        if ((strcmp(bookmark_file_name,RECENT_BOOKMARK_FILE)==0))
        {
            if(bookmark_count >= MAX_BOOKMARKS)
            break;
        }
        
        if (check_bookmark(global_read_buffer))
        {
            if (bookmark_id != bookmark_count)
            {
                write(temp_bookmark_file, global_read_buffer,
                      strlen(global_read_buffer));
                write(temp_bookmark_file, "\n", 1);
            }
            bookmark_count++;
        }
    }

    close(bookmark_file);
    close(temp_bookmark_file);

    remove(bookmark_file_name);
    rename(global_temp_buffer, bookmark_file_name);

    return true;
}

/* ----------------------------------------------------------------------- */
/* This function parses a bookmark and displays it for the user.           */
/* ------------------------------------------------------------------------*/
static void display_bookmark(char* bookmark,
                             int bookmark_id,
                             int bookmark_count)
{
    int  resume_index = 0;
    int  ms = 0;
    int  repeat_mode = 0;
    bool playlist_shuffle = false;
    char MP3_file_name[45];
    int  len;
    char *dot;

    /* getting the index and the time into the file */
    parse_bookmark(bookmark,
                   &resume_index, NULL, NULL, NULL, NULL, 0,
                   &ms, &repeat_mode, &playlist_shuffle,
                   MP3_file_name, sizeof(MP3_file_name));

    lcd_clear_display();
    lcd_stop_scroll();

#ifdef HAVE_LCD_BITMAP
    /* bookmark shuffle and repeat states*/
    switch (repeat_mode)
    {
        case REPEAT_ONE:
            statusbar_icon_play_mode(Icon_RepeatOne);
            break;

        case REPEAT_ALL:
            statusbar_icon_play_mode(Icon_Repeat);
            break;
    }
    if(playlist_shuffle)
        statusbar_icon_shuffle();

    /* File Name */
    len=strlen(MP3_file_name);
    if (len>3)
      dot=strrchr(MP3_file_name + len - 4, '.');
    else
      dot=NULL;
    if (dot)
        *dot='\0';
    lcd_puts_scroll(0, 0, MP3_file_name);
    if (dot)
        *dot='.';

    /* bookmark number */
    snprintf(global_temp_buffer, sizeof(global_temp_buffer), "%s: %2d/%2d",
             str(LANG_BOOKMARK_SELECT_BOOKMARK_TEXT),
             bookmark_id + 1, bookmark_count);
    lcd_puts_scroll(0, 1, global_temp_buffer);

    /* bookmark resume index */
    snprintf(global_temp_buffer, sizeof(global_temp_buffer), "%s: %2d",
             str(LANG_BOOKMARK_SELECT_INDEX_TEXT), resume_index+1);
    lcd_puts_scroll(0, 2, global_temp_buffer);

    /* elapsed time*/
    snprintf(global_temp_buffer, sizeof(global_temp_buffer), "%s: %d:%02d",
             str(LANG_BOOKMARK_SELECT_TIME_TEXT),
             ms / 60000,
             ms % 60000 / 1000);
    lcd_puts_scroll(0, 3, global_temp_buffer);

    /* commands */
    lcd_puts_scroll(0, 4, str(LANG_BOOKMARK_SELECT_PLAY));
    lcd_puts_scroll(0, 5, str(LANG_BOOKMARK_SELECT_EXIT));
    lcd_puts_scroll(0, 6, str(LANG_BOOKMARK_SELECT_DELETE));
#else
    (void)bookmark_id;
    len=strlen(MP3_file_name);
    if (len>3)
      dot=strrchr(MP3_file_name+len-4,'.');
    else
      dot=NULL;
    if (dot)
        *dot='\0';
    snprintf(global_temp_buffer, sizeof(global_temp_buffer),
             "%2d, %d:%02d, %s,",
             (bookmark_count+1),
             ms / 60000,
             ms % 60000 / 1000,
             MP3_file_name);
    status_draw(false);
    lcd_puts_scroll(0,0,global_temp_buffer);
    lcd_puts(0,1,str(LANG_RESUME_CONFIRM_PLAYER));
    if (dot)
        *dot='.';
#endif
    lcd_update();
}

/* ----------------------------------------------------------------------- */
/* This function retrieves a given bookmark from a file.                   */
/* If the bookmark requested is beyond the number of bookmarks available   */
/* in the file, it will return the last one.                               */
/* It also returns the index number of the bookmark in the file            */
/* ------------------------------------------------------------------------*/
static char* get_bookmark(char* bookmark_file, int bookmark_count)
{
    int read_count = -1;
    int result = 0;
    int file = open(bookmark_file, O_RDONLY);

    if (file < 0)
        return NULL;

    /* Get the requested bookmark */
    while (read_count < bookmark_count)
    {
        /*Reading in a single bookmark */
        result = read_line(file,
                           global_read_buffer,
                           sizeof(global_read_buffer));

        /* Reading past the last bookmark in the file
           causes the loop to stop */
        if (result <= 0)
            break;

        read_count++;
    }

    close(file);
    if (read_count == bookmark_count)
        return global_read_buffer;
    else
        return NULL;
}

/* ----------------------------------------------------------------------- */
/* This function takes a bookmark and parses it.  This function also       */
/* validates the bookmark.  Passing in NULL for an output variable         */
/* indicates that value is not requested.                                  */
/* ----------------------------------------------------------------------- */
static bool parse_bookmark(char *bookmark,
                           int *resume_index,
                           int *resume_offset,
                           int *resume_seed,
                           int *resume_first_index,
                           char* resume_file,
                           unsigned int resume_file_size,
                           int* ms,
                           int * repeat_mode, bool *shuffle,
                           char* file_name,
                           unsigned int max_file_name_size)
{
    /* First check to see if a valid line was passed in. */
    int  bookmark_len                = strlen(bookmark);
    int  local_resume_index          = 0;
    int  local_resume_offset         = 0;
    int  local_resume_seed           = 0;
    int  local_resume_first_index    = 0;
    int  local_mS                    = 0;
    int  local_shuffle               = 0;
    int  local_repeat_mode           = 0;
    char* local_resume_file          = NULL;
    char* local_file_name            = NULL;
    char* field;
    char* end;
    static char bookmarkcopy[MAX_BOOKMARK_SIZE];

    /* Don't do anything if the bookmark length is 0 */
    if (bookmark_len <= 0)
        return false;

    /* Making a dup of the bookmark to use with strtok_r */
    strncpy(bookmarkcopy, bookmark, sizeof(bookmarkcopy));
    bookmarkcopy[sizeof(bookmarkcopy) - 1] = 0;

    /* resume_index */
    if ((field = strtok_r(bookmarkcopy, ";", &end)))
        local_resume_index = atoi(field);
    else
        return false;

    /* resume_offset */
    if ((field = strtok_r(NULL, ";", &end)))
        local_resume_offset = atoi(field);
    else
        return false;

    /* resume_seed */
    if ((field = strtok_r(NULL, ";", &end)))
        local_resume_seed = atoi(field);
    else
        return false;

    /* resume_first_index */
    if ((field = strtok_r(NULL, ";", &end)))
        local_resume_first_index = atoi(field);
    else
        return false;

    /* Milliseconds into MP3.  Used for the bookmark select menu */
    if ((field = strtok_r(NULL, ";", &end)))
        local_mS = atoi(field);
    else
        return false;

    /* repeat_mode */
    if ((field = strtok_r(NULL, ";", &end)))
        local_repeat_mode = atoi(field);
    else
        return false;

    /* shuffle mode */
    if ((field = strtok_r(NULL, ";", &end)))
        local_shuffle = atoi(field);
    else
        return false;

    /* resume_file & file_name (for the bookmark select menu)*/
    if (end)
    {
        local_resume_file = strtok_r(NULL, ";", &end);
        if (local_resume_file[strlen(local_resume_file) - 1] == '/')
            local_resume_file[strlen(local_resume_file) - 1] = '\0';

        if (end)
            local_file_name = strtok_r(NULL, ";", &end);
    }
    else
        return false;

    /* Only return the values the calling function wants */
    if (resume_index)
        *resume_index = local_resume_index;

    if (resume_offset)
        *resume_offset = local_resume_offset;

    if (resume_seed)
        *resume_seed = local_resume_seed;

    if (resume_first_index)
        *resume_first_index = local_resume_first_index;

    if (resume_file && local_resume_file)
    {
        strncpy(resume_file, local_resume_file,
                MIN(strlen(local_resume_file), resume_file_size-1));
        resume_file[MIN(strlen(local_resume_file), resume_file_size-1)]=0;
    }

    if (ms)
        *ms = local_mS;

    if (shuffle)
        *shuffle = local_shuffle;

    if (repeat_mode)
        *repeat_mode = local_repeat_mode;

    if (file_name && local_file_name)
    {
        strncpy(file_name, local_file_name,
                MIN(strlen(local_file_name),max_file_name_size-1));
        file_name[MIN(strlen(local_file_name),max_file_name_size-1)]=0;
    }

    return true;
}

/* ----------------------------------------------------------------------- */
/* This function is used by multiple functions and is used to generate a   */
/* bookmark named based off of the input.                                  */
/* Changing this function could result in how the bookmarks are stored.    */
/* it would be here that the centralized/decentralized bookmark code       */
/* could be placed.                                                        */
/* ----------------------------------------------------------------------- */
static bool generate_bookmark_file_name(char *in, char *out,
                                        unsigned int max_length)
{
    char* cp;

    if (!in || !out || max_length <= 0)
        return false;

    if (max_length < strlen(in)+6)
        return false;

    /* if this is a root dir MP3, rename the boomark file root_dir.bmark */
    /* otherwise, name it based on the in variable */
    cp = in;

    cp = in + strlen(in) - 1;
    if (*cp == '/')
        *cp = 0;

    cp = in;
    if (*cp == '/')
        cp++;

    if (strlen(in) > 0)
        snprintf(out, max_length, "/%s.%s", cp, "bmark");
    else
        snprintf(out, max_length, "/root_dir.%s", "bmark");

    return true;
}

/* ----------------------------------------------------------------------- */
/* Checks the current state of the system and returns if it is in a        */
/* bookmarkable state.                                                     */
/* ----------------------------------------------------------------------- */
/* Inputs:                                                                 */
/* ----------------------------------------------------------------------- */
/* Outputs:                                                                */
/* return bool:  Indicates if the system was in a bookmarkable state       */
/* ----------------------------------------------------------------------- */
static bool system_check(void)
{
    int resume_index = 0;
    struct mp3entry *id3 = mpeg_current_track();

    if (!id3)
    {
        /* no track playing */
        return false; 
    }

    /* Checking to see if playing a queued track */
    if (playlist_get_resume_info(&resume_index) == -1)
    {
        /* something bad happened while getting the queue information */
        return false;
    }
    else if (playlist_modified(NULL))
    {
        /* can't bookmark while in the queue */
        return false;
    }

    return true;
}