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/* Copyright (C) 2017 C. McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <ctype.h>
#include <err.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sysexits.h>
#include <unistd.h>
typedef unsigned char byte;
static bool zero(const byte *ptr, size_t size) {
for (size_t i = 0; i < size; ++i) {
if (ptr[i]) return false;
}
return true;
}
static struct {
size_t cols;
size_t group;
size_t blank;
bool ascii;
bool offset;
bool skip;
} options = { 16, 8, 0, true, true, false };
static void dump(FILE *file) {
bool skip = false;
byte buf[options.cols];
size_t offset = 0;
for (
size_t size;
(size = fread(buf, 1, sizeof(buf), file));
offset += size
) {
if (options.skip) {
if (zero(buf, size)) {
if (!skip) printf("*\n");
skip = true;
continue;
} else {
skip = false;
}
}
if (options.blank) {
if (offset && offset % options.blank == 0) {
printf("\n");
}
}
if (options.offset) {
printf("%08zX: ", offset);
}
for (size_t i = 0; i < sizeof(buf); ++i) {
if (options.group) {
if (i && !(i % options.group)) {
printf(" ");
}
}
if (i < size) {
printf("%02hhX ", buf[i]);
} else {
printf(" ");
}
}
if (options.ascii) {
printf(" ");
for (size_t i = 0; i < size; ++i) {
if (options.group) {
if (i && !(i % options.group)) {
printf(" ");
}
}
printf("%c", isprint(buf[i]) ? buf[i] : '.');
}
}
printf("\n");
}
}
static void undump(FILE *file) {
byte c;
int match;
while (0 < (match = fscanf(file, " %hhx", &c))) {
printf("%c", c);
}
if (!match) errx(EX_DATAERR, "invalid input");
}
int main(int argc, char *argv[]) {
bool reverse = false;
const char *path = NULL;
int opt;
while (0 < (opt = getopt(argc, argv, "ac:g:p:rsz"))) {
switch (opt) {
break; case 'a': options.ascii ^= true;
break; case 'c': options.cols = strtoul(optarg, NULL, 0);
break; case 'g': options.group = strtoul(optarg, NULL, 0);
break; case 'p': options.blank = strtoul(optarg, NULL, 0);
break; case 'r': reverse = true;
break; case 's': options.offset ^= true;
break; case 'z': options.skip ^= true;
break; default: return EX_USAGE;
}
}
if (argc > optind) path = argv[optind];
if (!options.cols) return EX_USAGE;
FILE *file = path ? fopen(path, "r") : stdin;
if (!file) err(EX_NOINPUT, "%s", path);
if (reverse) {
undump(file);
} else {
dump(file);
}
if (ferror(file)) err(EX_IOERR, "%s", path);
return EX_OK;
}
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