reworks text viewer plugin. (FS#11209)

new text viewer plugin: text_viewer.rock.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26571 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/text_viewer/tv_text_reader.c

@@ -0,0 +1,91 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 Gilles Roux
+ *               2003 Garrett Derner
+ *               2010 Yoshihisa Uchida
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "plugin.h"
+#include "tv_pager.h"
+#include "tv_reader.h"
+#include "tv_text_processor.h"
+#include "tv_text_reader.h"
+
+static int get_block;
+static bool get_double_blocks;
+
+bool tv_init_text_reader(unsigned char *buf, size_t bufsize, size_t *used_size)
+{
+    size_t size;
+
+    if (!tv_init_text_processor(buf, bufsize, used_size))
+        return false;
+
+    size = *used_size;
+    if (!tv_init_pager(buf + size, bufsize - size, used_size))
+        return false;
+
+    *used_size += size;
+    return true;
+}
+
+void tv_finalize_text_reader(void)
+{
+    tv_finalize_pager();
+}
+
+void tv_set_read_conditions(int blocks, int width)
+{
+    tv_set_creation_conditions(blocks, width);
+}
+
+off_t tv_get_total_text_size(void)
+{
+    return tv_get_file_size();
+}
+
+bool tv_get_next_line(const unsigned char **buf)
+{
+    ssize_t bufsize;
+    const unsigned char *buffer = tv_get_buffer(&bufsize);
+
+    if (bufsize > 0)
+    {
+        tv_move_next_line(
+             tv_create_formed_text(buffer, bufsize, get_block, get_double_blocks, buf));
+        return true;
+    }
+    return false;
+}
+
+void tv_read_start(int block, bool is_multi)
+{
+    get_block = block;
+    get_double_blocks = is_multi;
+    tv_reset_line_positions();
+}
+
+int tv_read_end(void)
+{
+    return tv_get_line_positions(0);
+}
+
+void tv_seek_top(void)
+{
+   tv_move_screen(0, 0, SEEK_SET);
+}