/*

 * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "classfile/classLoader.hpp"

#include "classfile/classLoaderData.inline.hpp"

#include "classfile/sharedPathsMiscInfo.hpp"

#include "logging/log.hpp"

#include "memory/allocation.inline.hpp"

#include "memory/metaspaceShared.hpp"

#include "runtime/arguments.hpp"

#include "utilities/ostream.hpp"

void SharedPathsMiscInfo::add_path(const char* path, int type) {

  log_info(classpath)("type=%s ", type_name(type));

  ClassLoader::trace_class_path("add misc shared path ", path);

  write(path, strlen(path) + 1);

  write_jint(jint(type));

}

void SharedPathsMiscInfo::ensure_size(size_t needed_bytes) {

  assert(_allocated, "cannot modify buffer during validation.");

  int used = get_used_bytes();

  int target = used + int(needed_bytes);

  if (target > _buf_size) {

    _buf_size = _buf_size * 2 + (int)needed_bytes;

    _buf_start = REALLOC_C_HEAP_ARRAY(char, _buf_start, _buf_size, mtClass);

    _cur_ptr = _buf_start + used;

    _end_ptr = _buf_start + _buf_size;

  }

}

void SharedPathsMiscInfo::write(const void* ptr, size_t size) {

  ensure_size(size);

  memcpy(_cur_ptr, ptr, size);

  _cur_ptr += size;

}

bool SharedPathsMiscInfo::read(void* ptr, size_t size) {

  if (_cur_ptr + size <= _end_ptr) {

    memcpy(ptr, _cur_ptr, size);

    _cur_ptr += size;

    return true;

  }

  return false;

}

bool SharedPathsMiscInfo::fail(const char* msg, const char* name) {

  ClassLoader::trace_class_path(msg, name);

  MetaspaceShared::set_archive_loading_failed();

  return false;

}

void SharedPathsMiscInfo::print_path(int type, const char* path) {

  ResourceMark rm;

  switch (type) {

  case BOOT:

    out->print("Expecting BOOT path=%s", path);

    break;

  case NON_EXIST:

    out->print("Expecting that %s does not exist", path);

    break;

  case REQUIRED:

    out->print("Expecting that file %s must exist and is not altered", path);

    break;

  default:

    ShouldNotReachHere();

  }

}

bool SharedPathsMiscInfo::check() {

  // The whole buffer must be 0 terminated so that we can use strlen and strcmp

  // without fear.

  _end_ptr -= sizeof(jint);

  if (_cur_ptr >= _end_ptr) {

    return fail("Truncated archive file header");

  }

  if (*_end_ptr != 0) {

    return fail("Corrupted archive file header");

  }

  while (_cur_ptr < _end_ptr) {

    jint type;

    const char* path = _cur_ptr;

    _cur_ptr += strlen(path) + 1;

    if (!read_jint(&type)) {

      return fail("Corrupted archive file header");

    }

    log_info(classpath)("type=%s ", type_name(type));

    print_path(type, path);

    if (!check(type, path)) {

      if (!PrintSharedArchiveAndExit) {

        return false;

      }

    } else {

      ClassLoader::trace_class_path("ok");

    }

  }

  return true;

}

bool SharedPathsMiscInfo::check(jint type, const char* path) {

  switch (type) {

  case BOOT:

    if (os::file_name_strcmp(path, Arguments::get_sysclasspath()) != 0) {

      return fail("[BOOT classpath mismatch, actual =", Arguments::get_sysclasspath());

    }

    break;

  case NON_EXIST: // fall-through

  case REQUIRED:

    {

      struct stat st;

      if (os::stat(path, &st) != 0) {

        // The file does not actually exist

        if (type == REQUIRED) {

          // but we require it to exist -> fail

          return fail("Required file doesn't exist");

        }

      } else {

        // The file actually exists

        if (type == NON_EXIST) {

          // But we want it to not exist -> fail

          return fail("File must not exist");

        }

        time_t    timestamp;

        long      filesize;

        if (!read_time(&timestamp) || !read_long(&filesize)) {

          return fail("Corrupted archive file header");

        }

        if (timestamp != st.st_mtime) {

          return fail("Timestamp mismatch");

        }

        if (filesize != st.st_size) {

          return fail("File size mismatch");

        }

      }

    }

    break;

  default:

    return fail("Corrupted archive file header");

  }

  return true;

}