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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Fluent Bit / xxd-c
* ==================
* Copyright (C) 2015-2018 Treasure Data Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* xxd-c is a really simple tool to convert text files to C static
* arrays definitions, it emulate the behavior of 'xxd -i' but with
* some other features required by Fluent Bit to ingest static
* configuration files and do registration in a proper way.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <monkey/mk_core/mk_getopt.h>
#define XXDC_CHUNK 1024
int xxdc_verbose;
static void xxdc_help(int rc)
{
fprintf(stderr, "Usage: xxd-c -i FILE_INPUT [-o FILE_OUTPUT] "
"[-s NAME]\n\n");
fprintf(stderr, " -i input text file\n");
fprintf(stderr, " -o output C header file\n");
fprintf(stderr, " -s C struct array name name\n");
fprintf(stderr, " -h print this help\n\n");
exit(rc);
}
static char *xxdc_struct_name(char *in, char *name)
{
int i;
int len;
char *p;
char *sname = NULL;
if (name) {
sname = strdup(name);
}
else {
p = strrchr(in, '/');
if (!p) {
sname = strdup(in);
}
else {
sname = strdup(p);
}
}
if (!sname) {
perror("strdup");
return NULL;
}
/* sanitize name */
len = strlen(sname);
for (i = 0; i < len; i++) {
if (sname[i] == '-' || sname[i] == '.') {
sname[i] = '_';
}
}
return sname;
}
static int xxdc_convert(char *in, char *out, char *name)
{
int i;
int len;
size_t size;
char tmp[128];
char *sname;
char buf[XXDC_CHUNK];
FILE *f_in;
FILE *f_out;
/* If no output file is given just print to stdout */
if (!out) {
f_out = stdout;
}
else {
f_out = fopen(out, "w");
if (!f_out) {
perror("fopen");
fprintf(stderr, "error opening output file: %s\n", out);
return -1;
}
}
f_in = fopen(in, "r");
if (!f_in) {
perror("fopen");
fprintf(stderr, "error opening input file: %s\n", in);
if (out) {
fclose(f_out);
}
return -1;
}
/* Get target struct name */
sname = xxdc_struct_name(in, name);
if (!sname) {
fclose(f_in);
if (out) {
fclose(f_out);
}
return -1;
}
/* Pre-processor header */
len = snprintf(tmp, sizeof(tmp) - 1,
"#ifndef XXD_C_%s\n"
"#define XXD_C_%s\n\n", sname, sname);
fwrite(tmp, len, 1, f_out);
/* Define byte array */
len = snprintf(tmp, sizeof(tmp) - 1,
"static unsigned char __%s[] = {", sname);
fwrite(tmp, len, 1, f_out);
/* Write bytes */
while ((size = fread(buf, sizeof(char), XXDC_CHUNK, f_in)) > 0) {
for (i = 0; i < size; i++) {
if (i % 12 == 0) {
fwrite("\n ", 5, 1, f_out);
}
len = snprintf(tmp, sizeof(tmp) - 1,
"0x%02x%s ", buf[i], ",");
fwrite(tmp, len, 1, f_out);
}
}
fwrite("\n};\n\n#endif\n", 12, 1, f_out);
free(sname);
fclose(f_in);
if (out) {
fclose(f_out);
}
if (xxdc_verbose) {
fprintf(stderr, "[xxdc] converted '%s' to '%s'\n",
in, out ? out: "STDOUT");
}
return 0;
}
int main(int argc, char **argv)
{
int opt;
int ret;
char *in = NULL;
char *out = NULL;
char *stname = NULL;
/* Setup long-options */
static const struct option long_opts[] = {
{ "input", required_argument, NULL, 'i' },
{ "output", optional_argument, NULL, 'o' },
{ "stname", optional_argument, NULL, 's' },
{ "verbose", no_argument , NULL, 'v' },
{ "help", required_argument, NULL, 'h' },
{ NULL, 0, NULL, 0 }
};
xxdc_verbose = 0;
while ((opt = getopt_long(argc, argv, "i:o:s:vh",
long_opts, NULL)) != -1) {
switch (opt) {
case 'i':
in = strdup(optarg);
break;
case 'o':
out = strdup(optarg);
break;
case 's':
stname = strdup(optarg);
break;
case 'v':
xxdc_verbose = 1;
break;
case 'h':
xxdc_help(EXIT_SUCCESS);
default:
xxdc_help(EXIT_FAILURE);
}
}
if (!in) {
fprintf(stderr, "Error: input file not set\n\n");
xxdc_help(EXIT_FAILURE);
}
ret = xxdc_convert(in, out, stname);
free(in);
free(out);
free(stname);
return ret;
}
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