C++ (Cpp) upb_stdio_bytesrc Examples

Example #1

File: test_decoder.c Project: andrewschaaf/upb

int main() {
  upb_symtab *symtab = upb_symtab_new();
  upb_symtab_add_descriptorproto(symtab);
  upb_def *fds = upb_symtab_lookup(
      symtab, UPB_STRLIT("google.protobuf.FileDescriptorSet"));

  upb_stdio *in = upb_stdio_new();
  upb_stdio_reset(in, stdin);
  upb_stdio *out = upb_stdio_new();
  upb_stdio_reset(out, stdout);
  upb_decoder d;
  upb_decoder_init(&d, upb_downcast_msgdef(fds));
  upb_decoder_reset(&d, upb_stdio_bytesrc(in));
  upb_textprinter *p = upb_textprinter_new();
  upb_handlers handlers;
  upb_handlers_init(&handlers);
  upb_textprinter_reset(p, &handlers, upb_stdio_bytesink(out), false);
  upb_src *src = upb_decoder_src(&d);
  upb_src_sethandlers(src, &handlers);

  upb_status status = UPB_STATUS_INIT;
  upb_src_run(src, &status);

  assert(upb_ok(&status));

  upb_status_uninit(&status);
  upb_stdio_free(in);
  upb_stdio_free(out);
  upb_decoder_uninit(&d);
  upb_textprinter_free(p);
  upb_def_unref(fds);
  upb_symtab_unref(symtab);

  // Prevent C library from holding buffers open, so Valgrind doesn't see
  // memory leaks.
  fclose(stdin);
  fclose(stdout);
}

Example #2

File: stream_transcode.c Project: Phuehvk/upb

int main(int argc, char *argv[]) {
  if (argc < 3) {
    fprintf(stderr, "Usage: stream_transcode <descfile> <msgname>\n");
    return 1;
  }

  upb_symtab *symtab = upb_symtab_new();
  size_t desc_len;
  const char *desc = upb_readfile(argv[1], &desc_len);
  if (!desc) {
    fprintf(stderr, "Couldn't open descriptor file: %s\n", argv[1]);
    return 1;
  }

  upb_status status = UPB_STATUS_INIT;
  upb_load_descriptor_into_symtab(symtab, desc, desc_len, &status);
  if (!upb_ok(&status)) {
    fprintf(stderr, "Error parsing descriptor: %s", upb_status_getstr(&status));
    return 1;
  }
  free((void*)desc);

  const upb_def *md = upb_symtab_lookup(symtab, argv[2]);
  if (!md) {
    fprintf(stderr, "Descriptor did not contain message: %s\n", argv[2]);
    return 1;
  }

  const upb_msgdef *m = upb_dyncast_msgdef_const(md);
  if (!m) {
    fprintf(stderr, "Def was not a msgdef.\n");
    return 1;
  }

  upb_stdio in, out;
  upb_stdio_init(&in);
  upb_stdio_init(&out);
  upb_stdio_reset(&in, stdin);
  upb_stdio_reset(&out, stdout);

  upb_handlers *handlers = upb_handlers_new();
  upb_textprinter *p = upb_textprinter_new();
  upb_textprinter_reset(p, upb_stdio_bytesink(&out), false);
  upb_textprinter_reghandlers(handlers, m);

  upb_decoder d;
  upb_decoder_init(&d, handlers);
  upb_decoder_reset(&d, upb_stdio_bytesrc(&in), 0, UPB_NONDELIMITED, p);

  upb_status_clear(&status);
  upb_decoder_decode(&d, &status);

  if (!upb_ok(&status)) {
    fprintf(stderr, "Error parsing input: %s", upb_status_getstr(&status));
  }

  upb_status_uninit(&status);
  upb_stdio_uninit(&in);
  upb_stdio_uninit(&out);
  upb_decoder_uninit(&d);
  upb_textprinter_free(p);
  upb_def_unref(UPB_UPCAST(m));
  upb_symtab_unref(symtab);

  // Prevent C library from holding buffers open, so Valgrind doesn't see
  // memory leaks.
  fclose(stdin);
  fclose(stdout);
}