1 /* 2 * Copyright (c) 1997, 2010, 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 29 void ClassFileStream::truncated_file_error(TRAPS) { 30 THROW_MSG(vmSymbols::java_lang_ClassFormatError(), "Truncated class file"); 31 } 32 33 ClassFileStream::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 41 u1 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 50 u2 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 61 u4 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 72 u8 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 83 void ClassFileStream::skip_u1(int length, TRAPS) { 84 if (_need_verify) { 85 guarantee_more(length, CHECK); 86 } 87 _current += length; 88 } 89 90 void ClassFileStream::skip_u2(int length, TRAPS) { 91 if (_need_verify) { 92 guarantee_more(length * 2, CHECK); 93 } 94 _current += length * 2; 95 }