/* Copyright 2026 Google LLC

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.

*/

/*

 * Fuzzer for Ghostscript's XPS (XML Paper Specification) interpreter.

 *

 * XPS documents are ZIP archives (identified by "PK" magic bytes).

 * The ZIP format requires seekable I/O, so we must write fuzz data to

 * a temp file. The ghostpdl auto-detection uses the "PK" prefix

 * (confidence 80 in xps_detect_language).

 *

 */

#include <base/gserrors.h>

#include <psi/iapi.h>

#include <stdint.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

static int gs_stdnull(void *inst, const char *buf, int len)

{

  return len;

}

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {

  if (size < 4)

    return 0;

  /* Write fuzz data directly to temp file */

  char infile[256];

  sprintf(infile, "/tmp/fuzz_xps.%d", getpid());

  FILE *f = fopen(infile, "wb");

  if (!f)

    return 0;

  fwrite(data, 1, size, f);

  fclose(f);

  void *gs = NULL;

  int ret = gsapi_new_instance(&gs, NULL);

  if (ret < 0) {

    unlink(infile);

    return 0;

  }

  gsapi_set_stdio(gs, NULL, gs_stdnull, gs_stdnull);

  gsapi_set_arg_encoding(gs, GS_ARG_ENCODING_UTF8);

  char *args[] = {

    (char *)"gpdl",

    (char *)"-dNOPAUSE",

    (char *)"-dBATCH",

    (char *)"-dQUIET",

    (char *)"-dSAFER",

    (char *)"-sDEVICE=nullpage",

    (char *)"-sOutputFile=/dev/null",

    (char *)"-r72x72",

    infile,

  };

  int argc = sizeof(args) / sizeof(args[0]);

  ret = gsapi_init_with_args(gs, argc, args);

  gsapi_exit(gs);

  gsapi_delete_instance(gs);

  unlink(infile);

  return 0;

}