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(unsigned char **buf, size_t *size)
  33 {
  34     return tv_init_text_processor(buf, size) && tv_init_pager(buf, size);
  35 }
  36
  37 void tv_finalize_text_reader(void)
  38 {
  39     tv_finalize_pager();
  40 }
  41
  42 void tv_set_read_conditions(int blocks, int width)
  43 {
  44     tv_set_creation_conditions(blocks, width);
  45 }
  46
  47 off_t tv_get_total_text_size(void)
  48 {
  49     return tv_get_file_size();
  50 }
  51
  52 bool tv_get_next_line(const unsigned char **buf)
  53 {
  54     ssize_t bufsize;
  55     const unsigned char *buffer = tv_get_buffer(&bufsize);
  56
  57     if (bufsize > 0)
  58     {
  59         tv_move_next_line(
  60              tv_create_formed_text(buffer, bufsize, get_block, get_double_blocks, buf));
  61         return true;
  62     }
  63     return false;
  64 }
  65
  66 void tv_read_start(int block, bool is_multi)
  67 {
  68     get_block = block;
  69     get_double_blocks = is_multi;
  70     tv_reset_line_positions();
  71 }
  72
  73 int tv_read_end(void)
  74 {
  75     return tv_get_line_positions(0);
  76 }
  77
  78 void tv_seek_top(void)
  79 {
  80    tv_move_screen(0, 0, SEEK_SET);
  81 }