classFileStream.cpp revision 5776:de6a9e811145 
1/*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "classfile/classFileStream.hpp"
27#include "classfile/vmSymbols.hpp"
28
29void ClassFileStream::truncated_file_error(TRAPS) {
30  THROW_MSG(vmSymbols::java_lang_ClassFormatError(), "Truncated class file");
31}
32
33ClassFileStream::ClassFileStream(u1* buffer, int length, char* source) {
34  _buffer_start = buffer;
35  _buffer_end   = buffer + length;
36  _current      = buffer;
37  _source       = source;
38  _need_verify  = false;
39}
40
41u1 ClassFileStream::get_u1(TRAPS) {
42  if (_need_verify) {
43    guarantee_more(1, CHECK_0);
44  } else {
45    assert(1 <= _buffer_end - _current, "buffer overflow");
46  }
47  return *_current++;
48}
49
50u2 ClassFileStream::get_u2(TRAPS) {
51  if (_need_verify) {
52    guarantee_more(2, CHECK_0);
53  } else {
54    assert(2 <= _buffer_end - _current, "buffer overflow");
55  }
56  u1* tmp = _current;
57  _current += 2;
58  return Bytes::get_Java_u2(tmp);
59}
60
61u4 ClassFileStream::get_u4(TRAPS) {
62  if (_need_verify) {
63    guarantee_more(4, CHECK_0);
64  } else {
65    assert(4 <= _buffer_end - _current, "buffer overflow");
66  }
67  u1* tmp = _current;
68  _current += 4;
69  return Bytes::get_Java_u4(tmp);
70}
71
72u8 ClassFileStream::get_u8(TRAPS) {
73  if (_need_verify) {
74    guarantee_more(8, CHECK_0);
75  } else {
76    assert(8 <= _buffer_end - _current, "buffer overflow");
77  }
78  u1* tmp = _current;
79  _current += 8;
80  return Bytes::get_Java_u8(tmp);
81}
82
83void ClassFileStream::skip_u1(int length, TRAPS) {
84  if (_need_verify) {
85    guarantee_more(length, CHECK);
86  }
87  _current += length;
88}
89
90void ClassFileStream::skip_u2(int length, TRAPS) {
91  if (_need_verify) {
92    guarantee_more(length * 2, CHECK);
93  }
94  _current += length * 2;
95}
96
97void ClassFileStream::skip_u4(int length, TRAPS) {
98  if (_need_verify) {
99    guarantee_more(length * 4, CHECK);
100  }
101  _current += length * 4;
102}
103