apps/plugins/text_viewer/tv_text_reader.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 Gilles Roux
  11  *               2003 Garrett Derner
  12  *               2010 Yoshihisa Uchida
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * as published by the Free Software Foundation; either version 2
  17  * of the License, or (at your option) any later version.
  18  *
  19  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  20  * KIND, either express or implied.
  21  *
  22  ****************************************************************************/
  23 #include "plugin.h"
  24 #include "tv_pager.h"
  25 #include "tv_reader.h"
  26 #include "tv_text_processor.h"
  27 #include "tv_text_reader.h"
  28
  29 static int get_block;
  30 static bool get_double_blocks;
  31
  32 bool tv_init_text_reader(void)
  33 {
  34     tv_init_text_processor();
  35
  36     return tv_init_pager();
  37 }
  38
  39 void tv_finalize_text_reader(void)
  40 {
  41     tv_finalize_pager();
  42 }
  43
  44 void tv_set_read_conditions(int blocks, int width)
  45 {
  46     tv_set_creation_conditions(blocks, width);
  47 }
  48
  49 off_t tv_get_total_text_size(void)
  50 {
  51     return tv_get_file_size();
  52 }
  53
  54 bool tv_get_next_line(const unsigned char **buf)
  55 {
  56     ssize_t bufsize;
  57     const unsigned char *buffer = tv_get_buffer(&bufsize);
  58
  59     if (bufsize > 0)
  60     {
  61         tv_move_next_line(
  62              tv_create_formed_text(buffer, bufsize, get_block, get_double_blocks, buf));
  63         return true;
  64     }
  65     return false;
  66 }
  67
  68 void tv_read_start(int block, bool is_multi)
  69 {
  70     get_block = block;
  71     get_double_blocks = is_multi;
  72     tv_reset_line_positions();
  73 }
  74
  75 int tv_read_end(void)
  76 {
  77     return tv_get_line_positions(0);
  78 }
  79
  80 void tv_seek_top(void)
  81 {
  82    tv_move_screen(0, 0, SEEK_SET);
  83 }