| /* |
| * Copyright (c) 1997, 2014, 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, const 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; |
| } |