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key_handler.c
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/*************************************************************
*
* File: key_handler.c
* Author: David Kelley
* Description: Handle key presses and other user input
*
* Copyright (C) 2009 David Kelley
*
* This file is part of bviplus.
*
* Bviplus 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 3 of the License, or
* (at your option) any later version.
*
* Bviplus is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with bviplus. If not, see <http://www.gnu.org/licenses/>.
*
*************************************************************/
#include <ncurses.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <sys/stat.h>
#include <dirent.h>
#include "key_handler.h"
#include "user_prefs.h"
#include "display.h"
#include "actions.h"
#include "app_state.h"
#include "help.h"
#define ALPHANUMERIC(x) ((x >= 'a' && x <= 'z') || (x >= 'A' && x <= 'Z') || (x >= '0' && x <= '9'))
#define WHITESPACE(x) (x == ' ' || x == '\t' || !isprint(x)) /* includes all non-print chars */
macro_record_t macro_record[26];
int macro_key = -1;
int last_macro_key = -1;
int mwgetch(WINDOW *w)
{
int i, k;
if (macro_key == -1)
return wgetch(w);
else
{
k = wgetch(w);
i = macro_record[macro_key].key_index++;
macro_record[macro_key].key[i] = k;
return k;
}
}
int mgetch(void)
{
int i, k;
if (macro_key == -1)
return getch();
else
{
k = getch();
i = macro_record[macro_key].key_index++;
macro_record[macro_key].key[i] = k;
return k;
}
}
action_code_t show_set(void)
{
action_code_t error = E_SUCCESS;
int i = 0, num_elements = 0, eq_tab1 = 25, eq_tab2 = 35, len;
char **text;
while (user_prefs[num_elements].flags != P_NONE)
num_elements++;
/* one extra for delimeter */
text = malloc(sizeof(char *)*(num_elements+2));
if (text == NULL)
{
msg_box("Could not allocate memory for display window");
return E_INVALID;
}
text[0] = (char *)malloc(256);
snprintf(text[0], 256, " [Setting Name] [Alias] [Value]");
for(i=0; i<num_elements; i++)
{
text[i+1] = (char *)malloc(256);
snprintf(text[i+1], 256, " %s", user_prefs[i].name);
len = strlen(text[i+1]);
for (;len<eq_tab1;len++)
snprintf(text[i+1] + len, 256 - len, " ");
snprintf(text[i+1] + len, 256 - len, "%s", user_prefs[i].short_name);
len = strlen(text[i+1]);
for (;len<eq_tab2;len++)
snprintf(text[i+1] + len, 256 - len, " ");
if (user_prefs[i].flags == P_INT)
snprintf(text[i+1] + len, 256 - len, "= %d",
user_prefs[i].value);
else if (user_prefs[i].flags == P_BOOL)
snprintf(text[i+1] + len, 256 - len, "= %s",
user_prefs[i].value == TRUE ? "TRUE" : "FALSE");
}
text[i+1] = NULL;
scrollable_window_display(text);
for(i=0; i<num_elements+1; i++)
free(text[i]);
free(text);
return error;
}
action_code_t do_set(void)
{
action_code_t error = E_SUCCESS;
const char delimiters[] = " =";
char *option, *value;
/* process same string as last strtok() call from cmd_parse()*/
option = strtok(NULL, delimiters);
value = strtok(NULL, delimiters);
if (option == NULL)
{
error = show_set();
return error;
}
error = set_pref(option, value);
action_do_resize(); /* just in case a display pref was set */
return error;
}
static int all(const struct dirent *unused)
{ return 1; }
BOOL file_browser(const char *dir, char *fname, int name_len)
{
int top = 0, selection = 0, count = 0;
int c = 0, i, j;
int dirchange = 1, update = 1;
BOOL found = FALSE;
struct stat stat_buf;
struct dirent **eps;
WINDOW *fb;
memset(fname, 0, name_len);
strncat(fname, dir, name_len);
fb = newwin(SCROLL_BOX_H, SCROLL_BOX_W, SCROLL_BOX_Y, SCROLL_BOX_X);
curs_set(0);
do
{
switch (c)
{
case 'j':
case KEY_DOWN:
selection++;
if (selection >= count)
selection = count - 1;
if (selection - top > SCROLL_BOX_H - 5)
top++;
update = 1;
break;
case 'k':
case KEY_UP:
selection--;
if (selection < 0)
selection = 0;
if (selection < top)
top--;
update = 1;
break;
case NL:
case CR:
case KEY_ENTER:
case 'g':
strncat(fname, "/", name_len);
strncat(fname, eps[selection]->d_name, name_len);
dirchange = 1;
update = 1;
break;
default:
break;
}
if (dirchange)
{
dirchange = 0;
selection = 0;
top = 0;
if (stat(fname, &stat_buf))
{
msg_box("Could not find %s", fname);
break;
}
if (!S_ISDIR(stat_buf.st_mode))
{
found = TRUE;
break;
}
count = scandir (fname, &eps, all, alphasort);
if (count < 0)
{
msg_box("Could not scan directory %s", fname);
break;
}
}
if (update)
{
update = 0;
werase(fb);
box(fb, 0, 0);
for (i=top,j=1; i<count; i++)
{
if (j >= (SCROLL_BOX_H - 3))
break;
else
{
if (i == selection)
wattron(fb, A_STANDOUT);
mvwprintw(fb, j, 1, eps[i]->d_name);
wattroff(fb, A_STANDOUT);
}
j++;
}
mvwprintw(fb, SCROLL_BOX_H - 3, 1, "___________________________________________________________");
mvwprintw(fb, SCROLL_BOX_H - 2, 1, " [j|DOWN] Down [k|UP] Up [ENTER|g] Select [q|ESC] Cancel |");
wrefresh(fb);
}
c = mgetch();
} while(c != ESC && c != 'q' && c != 'Q');
delwin(fb);
curs_set(1);
print_screen(display_info.page_start);
return found;
}
action_code_t cmd_parse(char *cbuff)
{
action_code_t error = E_SUCCESS;
char *tok = 0, *endptr = 0;
const char delimiters[] = " =";
long long num = 0;
char fname[MAX_FILE_NAME], *ftemp;
off_t caddrsave, paddrsave;
struct stat stat_buf;
tok = strtok(cbuff, delimiters);
if (tok != NULL)
{
int relative = 0; // -1 or +1 means that the jump is relative to the cursor
if (tok[0] == '+' || tok[0] == '-') {
relative = (tok[0] == '-') ? -1 : +1;
tok++;
}
num = strtoll(tok, &endptr, 0);
if ((endptr - tok) == strlen(tok))
{
if (relative != 0)
num = display_info.cursor_addr + relative * num;
if (address_invalid(num))
msg_box("Invalid jump address: %d", num);
else
action_jump_to(num, CURSOR_REAL);
return error;
}
if (strncmp(tok, "set", MAX_CMD_BUF) == 0)
{
error = do_set();
return error;
}
if ((strncmp(tok, "next", MAX_CMD_BUF) == 0) ||
(strncmp(tok, "bn", MAX_CMD_BUF) == 0))
{
action_load_next_file();
return error;
}
if ((strncmp(tok, "prev", MAX_CMD_BUF) == 0) ||
(strncmp(tok, "previous", MAX_CMD_BUF) == 0) ||
(strncmp(tok, "bp", MAX_CMD_BUF) == 0) ||
(strncmp(tok, "last", MAX_CMD_BUF) == 0))
{
action_load_prev_file();
return error;
}
if (strncmp(tok, "e", MAX_CMD_BUF) == 0)
{
tok = strtok(NULL, delimiters);
if (tok == NULL)
{
current_file = vf_add_fm_to_ring(file_ring);
if (vf_init(current_file, NULL) == FALSE)
fprintf(stderr, "Empty file failed?\n");
update_display_info();
print_screen(0);
}
else
{
if (stat(tok, &stat_buf))
{
msg_box("Could not find %s", tok);
return error;
}
if (S_ISDIR(stat_buf.st_mode))
{
if (file_browser(tok, fname, MAX_FILE_NAME) != FALSE)
ftemp = fname;
else
return error;
}
else
{
ftemp = tok;
}
current_file = vf_add_fm_to_ring(file_ring);
if (vf_init(current_file, ftemp) == FALSE)
fprintf(stderr, "Could not open %s\n", ftemp);
update_display_info();
print_screen(0);
}
return error;
}
if (strncmp(tok, "e!", MAX_CMD_BUF) == 0)
{
snprintf(fname, MAX_FILE_NAME, "%s", vf_get_fname(current_file));
caddrsave = display_info.cursor_addr;
paddrsave = display_info.page_start;
vf_term(current_file);
vf_init(current_file, fname);
update_display_info();
place_cursor(caddrsave, CALIGN_NONE, CURSOR_REAL);
if (address_invalid(paddrsave))
print_screen(0);
else
print_screen(paddrsave);
return error;
}
if (strncmp(tok, "q", MAX_CMD_BUF) == 0)
{
action_quit(FALSE);
return error;
}
if (strncmp(tok, "q!", MAX_CMD_BUF) == 0)
{
action_quit(TRUE);
return error;
}
if (strncmp(tok, "qa", MAX_CMD_BUF) == 0)
{
action_quit_all(FALSE);
return error;
}
if (strncmp(tok, "qa!", MAX_CMD_BUF) == 0)
{
action_quit_all(TRUE);
return error;
}
if (strncmp(tok, "wa", MAX_CMD_BUF) == 0)
{
action_save_all();
return error;
}
if ((strncmp(tok, "wqa", MAX_CMD_BUF) == 0) ||
(strncmp(tok, "waq", MAX_CMD_BUF) == 0))
{
action_save_all();
action_quit_all(FALSE);
return error;
}
if (strncmp(tok, "w", MAX_CMD_BUF) == 0)
{
tok = strtok(NULL, delimiters);
if (tok == NULL)
action_save();
else
action_save_as(tok);
return error;
}
if ((strncmp(tok, "wq", MAX_CMD_BUF) == 0) ||
(strncmp(tok, "qw", MAX_CMD_BUF) == 0))
{
tok = strtok(NULL, delimiters);
if (tok == NULL)
action_save();
else
action_save_as(tok);
action_quit(FALSE);
return error;
}
if ((strncmp(tok, "help", MAX_CMD_BUF) == 0) ||
(strncmp(tok, "h", MAX_CMD_BUF) == 0))
{
scrollable_window_display(help_text);
return error;
}
if ((strncmp(tok, "external", MAX_CMD_BUF) == 0) ||
(strncmp(tok, "ex", MAX_CMD_BUF) == 0))
{
run_external();
return error;
}
}
flash();
return error;
}
action_code_t do_search(int c, cursor_t cursor)
{
cmd_hist_t *search_hist;
char *cmd, prompt[3];
search_direction_t direction = SEARCH_FORWARD;
if (c == '?')
{
direction = SEARCH_BACKWARD;
prompt[0] = c;
prompt[1] = 0;
werase(window_list[WINDOW_STATUS]);
mvwprintw(window_list[WINDOW_STATUS], 0, 0, prompt);
wrefresh(window_list[WINDOW_STATUS]);
c = mgetch();
while (c != '/' && c != '\\' && c != ESC)
{
flash();
c = mgetch();
}
prompt[1] = c;
prompt[2] = 0;
werase(window_list[WINDOW_STATUS]);
}
else
{
prompt[0] = c;
prompt[1] = 0;
}
if (c == '/')
search_hist = ascii_search_hist;
else
search_hist = hex_search_hist;
werase(window_list[WINDOW_STATUS]);
cmd = creadline(prompt, window_list[WINDOW_STATUS], 0, 0, search_hist);
if (cmd)
{
action_do_search(c, cmd, cursor, direction);
free(cmd);
}
return E_SUCCESS;
}
action_code_t word_move(int c, cursor_t cursor)
{
int i, size = 0;
off_t cur_addr, next_addr;
char buf[256], current_char;
int require_whitespace = 0;
cur_addr = display_info.cursor_addr;
next_addr = cur_addr;
size = vf_get_buf(current_file, buf, cur_addr, 256);
current_char = buf[0];
/* This seems like an ugly hack to me, but when a user presses 'w' they expect to go
to the next word, but when they type 'cw' they expect to change the current word,
and not the trailing whitespace or the first character of the next word */
if (cursor == CURSOR_VIRTUAL)
{
if (c == 'w')
c = 'e';
if (c == 'W')
c = 'E';
}
switch(c)
{
case 'W': /* next word, only whilespace are delimeters */
require_whitespace = 1;
/* no break */
case 'w': /* next word, any non-alphanumeric is delimiter,
and whitespace delimits groups of delimeters */
while (size > 1)
{
for (i=0; i<size; i++)
{
if (ALPHANUMERIC(current_char))
{
if (WHITESPACE(buf[i]))
{
current_char = buf[i];
continue;
}
else if (!ALPHANUMERIC(buf[i]) && require_whitespace == 0)
{
place_cursor(next_addr + i, CALIGN_NONE, cursor);
return E_SUCCESS;
}
}
else if (WHITESPACE(current_char))
{
if (!WHITESPACE(buf[i]))
{
place_cursor(next_addr + i, CALIGN_NONE, cursor);
return E_SUCCESS;
}
}
else
{
if (WHITESPACE(buf[i]))
{
current_char = buf[i];
continue;
}
else if (ALPHANUMERIC(buf[i]) && require_whitespace == 0)
{
place_cursor(next_addr + i, CALIGN_NONE, cursor);
return E_SUCCESS;
}
}
}
next_addr += size;
size = vf_get_buf(current_file, buf, next_addr, 256);
}
break;
case 'E': /* end of word, same delimit rules as W */
require_whitespace = 1;
/* no break */
case 'e': /* end of word, same delimit rules as w */
while (size > 1)
{
for (i=0; i<size; i++)
{
if (ALPHANUMERIC(current_char))
{
if (WHITESPACE(buf[i]))
{
if (i == 1 && next_addr == cur_addr)
{
/* if we were on the last character in a word we need
to move on to the next word */
current_char = buf[i];
continue;
}
place_cursor(next_addr + i - 1, CALIGN_NONE, cursor);
return E_SUCCESS;
}
else if (!ALPHANUMERIC(buf[i]) && require_whitespace == 0)
{
if (i == 1 && next_addr == cur_addr)
{
/* if we were on the last character in a word we need
to move on to the next word */
current_char = buf[i];
continue;
}
place_cursor(next_addr + i - 1, CALIGN_NONE, cursor);
return E_SUCCESS;
}
}
else if (WHITESPACE(current_char))
{
if (!WHITESPACE(buf[i]))
{
current_char = buf[i];
continue;
}
}
else
{
if (WHITESPACE(buf[i]))
{
if (i == 1 && next_addr == cur_addr)
{
/* if we were on the last character in a word we need
to move on to the next word */
current_char = buf[i];
continue;
}
place_cursor(next_addr + i - 1, CALIGN_NONE, cursor);
return E_SUCCESS;
}
else if (ALPHANUMERIC(buf[i]) && require_whitespace == 0)
{
if (i == 1 && next_addr == cur_addr)
{
/* if we were on the last character in a word we need
to move on to the next word */
current_char = buf[i];
continue;
}
place_cursor(next_addr + i - 1, CALIGN_NONE, cursor);
return E_SUCCESS;
}
}
}
next_addr += size;
size = vf_get_buf(current_file, buf, next_addr, 256);
}
break;
default:
break;
}
flash();
return E_NO_ACTION;
}
action_code_t word_move_back(int c, cursor_t cursor)
{
int i, size = 0;
off_t cur_addr, next_addr = 0;
char buf[256], current_char;
int require_whitespace = 0;
size = 256;
cur_addr = display_info.cursor_addr - (size-1);
if (address_invalid(cur_addr))
{
cur_addr = 0;
size = display_info.cursor_addr;
}
size = vf_get_buf(current_file, buf, cur_addr, size);
current_char = buf[size-1];
next_addr = cur_addr;
switch(c)
{
case 'B': /* end of word, same delimit rules as W */
require_whitespace = 1;
/* no break */
case 'b': /* end of word, same delimit rules as w */
while (size > 1)
{
for (i=size-1; i>=0; i--)
{
if (ALPHANUMERIC(current_char))
{
if (WHITESPACE(buf[i]))
{
if (i == size-2 && next_addr == cur_addr)
{
/* if we were on the last character in a word we need
to move on to the next word */
current_char = buf[i];
continue;
}
place_cursor(next_addr + i + 1, CALIGN_NONE, cursor);
return E_SUCCESS;
}
else if (!ALPHANUMERIC(buf[i]) && require_whitespace == 0)
{
if (i == size-2 && next_addr == cur_addr)
{
/* if we were on the last character in a word we need
to move on to the next word */
current_char = buf[i];
continue;
}
place_cursor(next_addr + i + 1, CALIGN_NONE, cursor);
return E_SUCCESS;
}
}
else if (WHITESPACE(current_char))
{
if (!WHITESPACE(buf[i]))
{
current_char = buf[i];
continue;
}
}
else
{
if (WHITESPACE(buf[i]))
{
if (i == size-2 && next_addr == cur_addr)
{
/* if we were on the last character in a word we need
to move on to the next word */
current_char = buf[i];
continue;
}
place_cursor(next_addr + i + 1, CALIGN_NONE, cursor);
return E_SUCCESS;
}
else if (ALPHANUMERIC(buf[i]) && require_whitespace == 0)
{
if (i == size-2 && next_addr == cur_addr)
{
/* if we were on the last character in a word we need
to move on to the next word */
current_char = buf[i];
continue;
}
place_cursor(next_addr + i + 1, CALIGN_NONE, cursor);
return E_SUCCESS;
}
}
}
next_addr -= size;
if (address_invalid(next_addr))
{
size = size + next_addr;
next_addr = 0;
}
size = vf_get_buf(current_file, buf, next_addr, size);
}
break;
default:
break;
}
flash();
return E_NO_ACTION;
}
action_code_t do_cmd_line(cursor_t cursor)
{
char *cmd;
werase(window_list[WINDOW_STATUS]);
cmd = creadline(":", window_list[WINDOW_STATUS], 0, 0, cmd_hist);
if (cmd)
{
cmd_parse(cmd);
free(cmd);
}
return E_SUCCESS;
}
off_t get_next_motion_addr(void)
{
int c, int_c, mark;
static int multiplier = 0;
static off_t jump_addr = -1;
display_info.virtual_cursor_addr = -1;
c = mgetch();
while (c != ESC)
{
if (c >= '0' && c <= '9')
{
int_c = c - '0';
if (multiplier == 0 && int_c == 0)
{
action_cursor_move_line_start(CURSOR_VIRTUAL);
return display_info.virtual_cursor_addr;
}
multiplier *= 10;
multiplier += int_c;
if (jump_addr == -1)
jump_addr = 0;
else
jump_addr *= 10;
jump_addr += int_c;
}
switch (c)
{
case '`':
mark = mgetch();
jump_addr = action_get_mark(mark);
action_jump_to(jump_addr, CURSOR_VIRTUAL);
return display_info.virtual_cursor_addr;
case 'g':
c = mgetch();
switch (c)
{
case 'g': /* gg */
action_cursor_move_file_start(CURSOR_VIRTUAL);
return display_info.virtual_cursor_addr;
/* ... 'g' + something else */
default:
break;
}
case 'G':
if (jump_addr == -1)
action_cursor_move_file_end(CURSOR_VIRTUAL);
else
action_jump_to(jump_addr, CURSOR_VIRTUAL);
return display_info.virtual_cursor_addr;
case 'j':
case KEY_DOWN:
action_cursor_move_down(multiplier, CURSOR_VIRTUAL);
return display_info.virtual_cursor_addr;
case 'k':
case KEY_UP:
action_cursor_move_up(multiplier, CURSOR_VIRTUAL);
return display_info.virtual_cursor_addr;
case 'h':
case KEY_LEFT:
action_cursor_move_left(multiplier, CURSOR_VIRTUAL);
return display_info.virtual_cursor_addr;
case 'l':
case KEY_RIGHT:
action_cursor_move_right(multiplier, CURSOR_VIRTUAL);
return display_info.virtual_cursor_addr;
case '$':
case KEY_END:
action_cursor_move_line_end(CURSOR_VIRTUAL);
return display_info.virtual_cursor_addr;
case KEY_HOME:
action_cursor_move_line_start(CURSOR_VIRTUAL);
return display_info.virtual_cursor_addr;
case BVICTRL('f'):
case KEY_NPAGE:
action_cursor_move_page_down(CURSOR_VIRTUAL);
return display_info.virtual_cursor_addr;
case BVICTRL('b'):
case KEY_PPAGE:
action_cursor_move_page_up(CURSOR_VIRTUAL);
return display_info.virtual_cursor_addr;
case 'n':
action_move_cursor_next_search(CURSOR_VIRTUAL, TRUE);
return display_info.virtual_cursor_addr;
case 'N':
action_move_cursor_prev_search(CURSOR_VIRTUAL);
return display_info.virtual_cursor_addr;
case ':':
do_cmd_line(CURSOR_VIRTUAL);
return display_info.virtual_cursor_addr;
case 'w':
case 'W':
case 'e':
case 'E':
word_move(c, CURSOR_VIRTUAL);
return display_info.virtual_cursor_addr;
case 'b':
case 'B':
word_move_back(c, CURSOR_VIRTUAL);
return display_info.virtual_cursor_addr;
case '?':
case '/':
case '\\':
do_search(c, CURSOR_VIRTUAL);
return display_info.virtual_cursor_addr;
case ESC:
return display_info.cursor_addr;
default:
break;
}
if (c < '0' || c > '9')
{
jump_addr = -1;
multiplier = 0;
}
flash();
c = mgetch();
}
return display_info.virtual_cursor_addr;
}
int is_hex(int c)
{
c = toupper(c);
if (c < '0')
return 0;
if (c > '9' && c < 'A')
return 0;
if (c > 'F')
return 0;
return 1;
}
void do_insert(int count, int c)
{
char *screen_buf, *ins_buf, *tmp_ins_buf;
char tmp[9], tmp2[MAX_GRP], tmpc;
int c2 = 0, i;
int hy, hx, ay, ax;
int ins_buf_size;
int chars_per_byte, char_count = 0, tmp_char_count = 0, low_tmp_char_count = 0;
int offset = 0, len1, ins_buf_offset, len2, len3;
off_t ins_addr, page_start;
screen_buf = (char *)malloc(2 * PAGE_SIZE); /* fix this later, but make it big for now */
ins_buf_size = user_prefs[GROUPING].value;
ins_buf = (char *)malloc(ins_buf_size);
/* later mod this depending on c = a/i/A/I */
switch (c)
{
case 'A': /* no break */
case 'a': /* no break */
if (display_info.file_size == 0)
ins_addr = display_info.cursor_addr;
else
ins_addr = display_info.cursor_addr + user_prefs[GROUPING].value;
break;
case INS:
case 'I': /* no break */
case 'i': /* no break */
default:
ins_addr = display_info.cursor_addr;
break;
#if 0
case 'c':
case 'C':
case 's':
case 'S':
#endif
}
page_start = display_info.page_start;
while (c2 != ESC)
{
if ((offset + char_count + 1) > PAGE_SIZE)
page_start += BYTES_PER_LINE;
offset = ins_addr - page_start;
if (offset < 0)
{
len1 = 0;
ins_buf_offset = page_start - ins_addr;
len2 = char_count - ins_buf_offset;
}
else
{
len1 = offset;
len2 = char_count;
ins_buf_offset = 0;
}
if ((len1 + len2) > PAGE_SIZE)
len3 = 0;
else
{
len3 = (PAGE_END - page_start) - len1 + user_prefs[GROUPING].value;
if ((len1 + len2 + len3) > PAGE_SIZE)
len3 = PAGE_SIZE - (len1 + len2);
}
if (len1 != 0)
vf_get_buf(current_file, screen_buf, page_start, len1);
if (len2 != 0)
memcpy(screen_buf + len1, ins_buf + ins_buf_offset, len2);
if (len3 > 0)
len3 = vf_get_buf(current_file, screen_buf + len1 + len2 + user_prefs[GROUPING].value, ins_addr, len3);
else
len3 = 0;
print_screen_buf(page_start, screen_buf, len1+len2+user_prefs[GROUPING].value+len3, NULL);
if (display_info.cursor_window == WINDOW_HEX)
{
hy = get_y_from_page_offset(len1+len2);
hx = get_x_from_page_offset(len1+len2);
display_info.cursor_window = WINDOW_ASCII;
ay = get_y_from_page_offset(len1+len2);