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/* hexedit.c - Hexadecimal file editor
*
* Copyright 2015 Rob Landley <rob@landley.net>
*
* No standard
USE_HEXEDIT(NEWTOY(hexedit, "<1>1r", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_LOCALE))
config HEXEDIT
bool "hexedit"
default y
help
usage: hexedit FILENAME
Hexadecimal file editor. All changes are written to disk immediately.
-r Read only (display but don't edit)
Keys:
Arrows Move left/right/up/down by one line/column
Pg Up/Pg Dn Move up/down by one page
0-9, a-f Change current half-byte to hexadecimal value
u Undo
q/^c/^d/<esc> Quit
*/
#define FOR_hexedit
#include "toys.h"
GLOBALS(
char *data;
long long len, base;
int numlen, undo, undolen;
unsigned height;
)
#define UNDO_LEN (sizeof(toybuf)/(sizeof(long long)+1))
// Render all characters printable, using color to distinguish.
static int draw_char(FILE *fp, wchar_t broiled)
{
if (fp) {
if (broiled<32 || broiled>=127) {
if (broiled>127) {
tty_esc("2m");
broiled &= 127;
}
if (broiled<32 || broiled==127) {
tty_esc("7m");
if (broiled==127) broiled = 32;
else broiled += 64;
}
printf("%c", (int)broiled);
tty_esc("0m");
} else printf("%c", (int)broiled);
}
return 1;
}
static void draw_tail(void)
{
tty_jump(0, TT.height);
tty_esc("K");
draw_trim(*toys.optargs, -1, 71);
}
static void draw_line(long long yy)
{
int x, xx = 16;
yy = (TT.base+yy)*16;
if (yy+xx>=TT.len) xx = TT.len-yy;
if (yy<TT.len) {
printf("\r%0*llX ", TT.numlen, yy);
for (x=0; x<xx; x++) printf(" %02X", TT.data[yy+x]);
printf("%*s", 2+3*(16-xx), "");
for (x=0; x<xx; x++) draw_char(stdout, TT.data[yy+x]);
printf("%*s", 16-xx, "");
}
tty_esc("K");
}
static void draw_page(void)
{
int y;
tty_jump(0, 0);
for (y = 0; y<TT.height; y++) {
if (y) printf("\r\n");
draw_line(y);
}
draw_tail();
}
// side: 0 = editing left, 1 = editing right, 2 = clear, 3 = read only
static void highlight(int xx, int yy, int side)
{
char cc = TT.data[16*(TT.base+yy)+xx];
int i;
// Display cursor
tty_jump(2+TT.numlen+3*xx, yy);
tty_esc("0m");
if (side!=2) tty_esc("7m");
if (side>1) printf("%02X", cc);
else for (i=0; i<2;) {
if (side==i) tty_esc("32m");
printf("%X", (cc>>(4*(1&++i)))&15);
}
tty_esc("0m");
tty_jump(TT.numlen+17*3+xx, yy);
draw_char(stdout, cc);
}
void hexedit_main(void)
{
long long pos = 0, y;
int x, i, side = 0, key, ro = toys.optflags&FLAG_r,
fd = xopen(*toys.optargs, ro ? O_RDONLY : O_RDWR);
char keybuf[16];
*keybuf = 0;
// Terminal setup
TT.height = 25;
terminal_size(0, &TT.height);
if (TT.height) TT.height--;
sigatexit(tty_sigreset);
tty_esc("0m");
tty_esc("?25l");
fflush(0);
xset_terminal(1, 1, 0);
if ((TT.len = fdlength(fd))<1) error_exit("bad length");
if (sizeof(long)==32 && TT.len>SIZE_MAX) TT.len = SIZE_MAX;
// count file length hex in digits, rounded up to multiple of 4
for (pos = TT.len, TT.numlen = 0; pos; pos >>= 4, TT.numlen++);
TT.numlen += (4-TT.numlen)&3;
TT.data = xmmap(0, TT.len, PROT_READ|(PROT_WRITE*!ro), MAP_SHARED, fd, 0);
draw_page();
for (;;) {
// Scroll display if necessary
if (pos<0) pos = 0;
if (pos>=TT.len) pos = TT.len-1;
x = pos&15;
y = pos/16;
i = 0;
while (y<TT.base) {
if (TT.base-y>(TT.height/2)) {
TT.base = y;
draw_page();
} else {
TT.base--;
i++;
tty_esc("1T");
tty_jump(0, 0);
draw_line(0);
}
}
while (y>=TT.base+TT.height) {
if (y-(TT.base+TT.height)>(TT.height/2)) {
TT.base = y-TT.height-1;
draw_page();
} else {
TT.base++;
i++;
tty_esc("1S");
tty_jump(0, TT.height-1);
draw_line(TT.height-1);
}
}
if (i) draw_tail();
y -= TT.base;
// Display cursor and flush output
highlight(x, y, ro ? 3 : side);
xflush();
// Wait for next key
key = scan_key(keybuf, -1);
// Exit for q, ctrl-c, ctrl-d, escape, or EOF
if (key==-1 || key==3 || key==4 || key==27 || key=='q') break;
highlight(x, y, 2);
// Hex digit?
if (key>='a' && key<='f') key-=32;
if (!ro && ((key>='0' && key<='9') || (key>='A' && key<='F'))) {
if (!side) {
long long *ll = (long long *)toybuf;
ll[TT.undo] = pos;
toybuf[(sizeof(long long)*UNDO_LEN)+TT.undo++] = TT.data[pos];
if (TT.undolen < UNDO_LEN) TT.undolen++;
TT.undo %= UNDO_LEN;
}
i = key - '0';
if (i>9) i -= 7;
TT.data[pos] &= 15<<(4*side);
TT.data[pos] |= i<<(4*!side);
if (++side==2) {
highlight(x, y, side);
side = 0;
++pos;
}
} else side = 0;
if (key=='u') {
if (TT.undolen) {
long long *ll = (long long *)toybuf;
TT.undolen--;
if (!TT.undo) TT.undo = UNDO_LEN;
pos = ll[--TT.undo];
TT.data[pos] = toybuf[sizeof(long long)*UNDO_LEN+TT.undo];
}
}
if (key>=256) {
key -= 256;
if (key==KEY_UP) pos -= 16;
else if (key==KEY_DOWN) pos += 16;
else if (key==KEY_RIGHT) {
if (x<15) pos++;
} else if (key==KEY_LEFT) {
if (x) pos--;
} else if (key==KEY_PGUP) pos -= 16*TT.height;
else if (key==KEY_PGDN) pos += 16*TT.height;
else if (key==KEY_HOME) pos = 0;
else if (key==KEY_END) pos = TT.len-1;
}
}
munmap(TT.data, TT.len);
close(fd);
tty_reset();
}
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