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// bin2c.c
//
// convert a binary file into a C source vector
//
// THE "BEER-WARE LICENSE" (Revision 3.1415):
// sandro AT sigala DOT it wrote this file. As long as you retain this notice
// you can do whatever you want with this stuff. If we meet some day, and you
// think this stuff is worth it, you can buy me a beer in return. Sandro Sigala
#ifdef __CYGWIN__
# include <alloca.h>
#endif
#include <ctype.h>
#include <fcntl.h>
#include <getopt.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <zlib.h>
#ifndef PATH_MAX
# define PATH_MAX 1024
#endif
const char* name = NULL;
static const char* HEADER_FMT
= "#ifndef bin2c_%s_h\n"
"#define bin2c_%s_h\n"
"\n"
"#include \"bin2c.hh\"\n"
"\n"
"extern struct bin_src_file %s%s;\n"
"\n"
"#endif\n"
"\n";
struct file_meta {
const char* fm_name;
unsigned int fm_compressed_size;
unsigned int fm_size;
};
void
symname(char* dst, const char* fname)
{
strcpy(dst, fname);
for (int lpc = 0; dst[lpc]; lpc++) {
if (!isalnum(dst[lpc])) {
dst[lpc] = '_';
}
}
}
void
process(struct file_meta* fm, FILE* ofile)
{
struct stat st;
if (stat(fm->fm_name, &st) == -1) {
perror("unable to stat file");
exit(1);
}
unsigned char* buf = malloc(st.st_size);
unsigned char* dest = malloc(st.st_size);
int fd = open(fm->fm_name, O_RDONLY);
if (fd == -1) {
perror("unable to open file");
exit(1);
}
int rc;
while ((rc = read(fd, &buf[fm->fm_size], (st.st_size - fm->fm_size))) > 0) {
fm->fm_size += rc;
}
uLongf destLen = st.st_size;
compress(dest, &destLen, buf, st.st_size);
fm->fm_compressed_size = destLen;
int c, col = 1;
char sym[1024];
symname(sym, basename((char*) fm->fm_name));
fprintf(ofile, "static const unsigned char %s_data[] = {\n", sym);
for (int lpc = 0; lpc < destLen; lpc++) {
c = dest[lpc];
if (col >= 78 - 6) {
fputc('\n', ofile);
col = 1;
}
fprintf(ofile, "0x%.2x, ", c);
col += 6;
}
fprintf(ofile, "0x00\n");
fprintf(ofile, "\n};\n");
free(buf);
free(dest);
}
void
usage()
{
fprintf(stderr, "usage: bin2c [-n name] <output_file> [input_file1 ...]\n");
exit(1);
}
int
main(int argc, char** argv)
{
int c;
while ((c = getopt(argc, argv, "hn:")) != -1) {
switch (c) {
case 'n':
name = optarg;
break;
default:
usage();
break;
}
}
argc -= optind;
argv += optind;
if (argc < 1) {
usage();
}
const char* out_base_name = argv[0];
char hname[PATH_MAX], hname_tmp[PATH_MAX], cname[PATH_MAX];
argc -= 1;
argv += 1;
snprintf(hname, sizeof(hname), "%s.h", out_base_name);
snprintf(hname_tmp, sizeof(hname_tmp), "%s.tmp", hname);
FILE* hfile = fopen(hname_tmp, "w+b");
if (hfile == NULL) {
fprintf(stderr, "cannot open %s for writing\n", hname_tmp);
exit(1);
}
snprintf(cname, sizeof(cname), "%s.cc", out_base_name);
FILE* cfile = fopen(cname, "wb");
if (cfile == NULL) {
fprintf(stderr, "cannot open %s for writing\n", cname);
exit(1);
}
char sym[1024];
if (name) {
strcpy(sym, name);
} else {
const char* in_base = basename(argv[0]);
symname(sym, in_base);
}
int array = argc > 1 || name;
char trailer[16];
if (array) {
snprintf(trailer, sizeof(trailer), "[%d]", argc);
} else {
trailer[0] = '\0';
}
fprintf(hfile, HEADER_FMT, sym, sym, sym, trailer);
fflush(hfile);
rewind(hfile);
int same = 1;
{
FILE* orig_hfile = fopen(hname, "rb");
if (orig_hfile == NULL) {
same = 0;
} else {
while (1) {
char orig_line[1024], new_line[1024];
char* orig_res
= fgets(orig_line, sizeof(orig_line), orig_hfile);
char* new_res = fgets(new_line, sizeof(new_line), hfile);
if (orig_res == NULL && new_res == NULL) {
break;
}
if (orig_res == NULL || new_res == NULL) {
same = 0;
break;
}
if (strcmp(orig_line, new_line) != 0) {
same = 0;
break;
}
}
}
}
fclose(hfile);
if (!same) {
rename(hname_tmp, hname);
} else {
remove(hname_tmp);
}
fprintf(cfile, "#include \"bin2c.hh\"\n");
fprintf(cfile, "\n");
struct file_meta* meta = alloca(sizeof(struct file_meta) * argc);
memset(meta, 0, sizeof(struct file_meta) * argc);
for (int lpc = 0; lpc < argc; lpc++) {
meta[lpc].fm_name = argv[lpc];
process(&meta[lpc], cfile);
}
fprintf(cfile, "struct bin_src_file %s%s = {\n", sym, trailer);
for (int lpc = 0; lpc < argc; lpc++) {
char sym[1024];
symname(sym, basename((char*) meta[lpc].fm_name));
fprintf(cfile, " ");
if (array) {
fprintf(cfile, "{ ");
}
fprintf(cfile,
"\"%s\", %s_data, %d, %d",
basename((char*) meta[lpc].fm_name),
sym,
meta[lpc].fm_compressed_size,
meta[lpc].fm_size);
if (array) {
fprintf(cfile, " },");
}
fprintf(cfile, "\n");
}
fprintf(cfile, "};\n");
fclose(cfile);
return 0;
}
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