/*

 * Copyright (c) 1997, 2013, 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/classFileStream.hpp"

#include "classfile/vmSymbols.hpp"

void ClassFileStream::truncated_file_error(TRAPS) {

  THROW_MSG(vmSymbols::java_lang_ClassFormatError(), "Truncated class file");

}

ClassFileStream::ClassFileStream(u1* buffer, int length, char* source) {

  _buffer_start = buffer;

  _buffer_end   = buffer + length;

  _current      = buffer;

  _source       = source;

  _need_verify  = false;

}

u1 ClassFileStream::get_u1(TRAPS) {

  if (_need_verify) {

    guarantee_more(1, CHECK_0);

  } else {

    assert(1 <= _buffer_end - _current, "buffer overflow");

  }

  return *_current++;

}

u2 ClassFileStream::get_u2(TRAPS) {

  if (_need_verify) {

    guarantee_more(2, CHECK_0);

  } else {

    assert(2 <= _buffer_end - _current, "buffer overflow");

  }

  u1* tmp = _current;

  _current += 2;

  return Bytes::get_Java_u2(tmp);

}

u4 ClassFileStream::get_u4(TRAPS) {

  if (_need_verify) {

    guarantee_more(4, CHECK_0);

  } else {

    assert(4 <= _buffer_end - _current, "buffer overflow");

  }

  u1* tmp = _current;

  _current += 4;

  return Bytes::get_Java_u4(tmp);

}

u8 ClassFileStream::get_u8(TRAPS) {

  if (_need_verify) {

    guarantee_more(8, CHECK_0);

  } else {

    assert(8 <= _buffer_end - _current, "buffer overflow");

  }

  u1* tmp = _current;

  _current += 8;

  return Bytes::get_Java_u8(tmp);

}

void ClassFileStream::skip_u1(int length, TRAPS) {

  if (_need_verify) {

    guarantee_more(length, CHECK);

  }

  _current += length;

}

void ClassFileStream::skip_u2(int length, TRAPS) {

  if (_need_verify) {

    guarantee_more(length * 2, CHECK);

  }

  _current += length * 2;

}

void ClassFileStream::skip_u4(int length, TRAPS) {

  if (_need_verify) {

    guarantee_more(length * 4, CHECK);

  }

  _current += length * 4;

}