datatoc.cc

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/* SPDX-FileCopyrightText: 2001-2002 NaN Holding BV. All rights reserved.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

 
#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <filesystem>
#include <iostream>
 
// #define VERBOSE
 
#define STRPREFIX(a, b) (strncmp((a), (b), strlen(b)) == 0)
 
static char *arg_basename(char *string)
{
  char *lfslash, *lbslash;
 
  lfslash = strrchr(string, '/');
  lbslash = strrchr(string, '\\');
  if (lbslash) {
    lbslash++;
  }
  if (lfslash) {
    lfslash++;
  }
 
  return std::max({string, lfslash, lbslash});
}
 
int main(int argc, char **argv)
{
  FILE *fpin, *fpout;
  long size;
  int i;
  int argv_len;
 
  if (argc != 3) {
    printf("Usage: datatoc <data_file_from> <data_file_to>\n");
    exit(1);
  }
 
  fpin = fopen(argv[1], "rb");
  if (!fpin) {
    printf("Unable to open input <%s>\n", argv[1]);
    exit(1);
  }
 
  argv[1] = arg_basename(argv[1]);
 
  fseek(fpin, 0L, SEEK_END);
  size = ftell(fpin);
  fseek(fpin, 0L, SEEK_SET);
 
  if (argv[1][0] == '.') {
    argv[1]++;
  }
 
#ifdef VERBOSE
  printf("Making C file <%s>\n", argv[2]);
#endif
 
  /* We make the required directories here rather than having the build system
   * do the work for us, as having cmake do it leads to several thousand cmake
   * instances being launched, leading to significant overhead, see pr #141404
   * for details. */
  std::filesystem::path parent_dir = std::filesystem::path(argv[2]).parent_path();
  std::error_code ec;
  if (!std::filesystem::create_directories(parent_dir, ec)) {
    if (ec) {
      std::cerr << "Unable to create " << parent_dir << " : " << ec.message() << std::endl;
      exit(1);
    }
  }
 
  argv_len = int(strlen(argv[1]));
  for (i = 0; i < argv_len; i++) {
    if (argv[1][i] == '.') {
      argv[1][i] = '_';
    }
  }
 
  fpout = fopen(argv[2], "w");
  if (!fpout) {
    fprintf(stderr, "Unable to open output <%s>\n", argv[2]);
    exit(1);
  }
 
  fprintf(fpout, "/* DataToC output of file <%s> */\n\n", argv[1]);
 
  /* Quiet 'missing-variable-declarations' warning. */
  fprintf(fpout, "extern const int datatoc_%s_size;\n", argv[1]);
  fprintf(fpout, "extern const char datatoc_%s[];\n\n", argv[1]);
 
  fprintf(fpout, "const int datatoc_%s_size = %d;\n", argv[1], int(size));
  fprintf(fpout, "const char datatoc_%s[] = {\n", argv[1]);
 
  while (size--) {
    /* Even though this file is generated and doesn't need new-lines,
     * these files may be loaded by developers when looking up symbols.
     * Avoid a very long single line that may lock-up some editors. */
    if (size % 32 == 31) {
      fprintf(fpout, "\n");
    }
 
    // fprintf(fpout, "\\x%02x", getc(fpin));
    fprintf(fpout, "%3d,", getc(fpin));
  }
 
  /* Trailing null terminator, this isn't needed in some cases and
   * won't be taken into account by the size variable, but its useful when dealing with
   * null terminated string data. */
  fprintf(fpout, "0\n};\n\n");
 
  fclose(fpin);
  fclose(fpout);
  return 0;
}