| /* |
| * Copyright (c) 1997, 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/classFileStream.hpp" |
| #include "classfile/classLoader.hpp" |
| #include "classfile/dictionary.hpp" |
| #include "classfile/vmSymbols.hpp" |
| #include "memory/resourceArea.hpp" |
| |
| const bool ClassFileStream::verify = true; |
| const bool ClassFileStream::no_verification = false; |
| |
| void ClassFileStream::truncated_file_error(TRAPS) const { |
| THROW_MSG(vmSymbols::java_lang_ClassFormatError(), "Truncated class file"); |
| } |
| |
| ClassFileStream::ClassFileStream(const u1* buffer, |
| int length, |
| const char* source, |
| bool verify_stream) : |
| _buffer_start(buffer), |
| _buffer_end(buffer + length), |
| _current(buffer), |
| _source(source), |
| _need_verify(verify_stream) {} |
| |
| const u1* ClassFileStream::clone_buffer() const { |
| u1* const new_buffer_start = NEW_RESOURCE_ARRAY(u1, length()); |
| memcpy(new_buffer_start, _buffer_start, length()); |
| return new_buffer_start; |
| } |
| |
| const char* const ClassFileStream::clone_source() const { |
| const char* const src = source(); |
| char* source_copy = NULL; |
| if (src != NULL) { |
| size_t source_len = strlen(src); |
| source_copy = NEW_RESOURCE_ARRAY(char, source_len + 1); |
| strncpy(source_copy, src, source_len + 1); |
| } |
| return source_copy; |
| } |
| |
| // Caller responsible for ResourceMark |
| // clone stream with a rewound position |
| const ClassFileStream* ClassFileStream::clone() const { |
| const u1* const new_buffer_start = clone_buffer(); |
| return new ClassFileStream(new_buffer_start, |
| length(), |
| clone_source(), |
| need_verify()); |
| } |
| |
| u1 ClassFileStream::get_u1(TRAPS) const { |
| if (_need_verify) { |
| guarantee_more(1, CHECK_0); |
| } else { |
| assert(1 <= _buffer_end - _current, "buffer overflow"); |
| } |
| return *_current++; |
| } |
| |
| u2 ClassFileStream::get_u2(TRAPS) const { |
| if (_need_verify) { |
| guarantee_more(2, CHECK_0); |
| } else { |
| assert(2 <= _buffer_end - _current, "buffer overflow"); |
| } |
| const u1* tmp = _current; |
| _current += 2; |
| return Bytes::get_Java_u2((address)tmp); |
| } |
| |
| u4 ClassFileStream::get_u4(TRAPS) const { |
| if (_need_verify) { |
| guarantee_more(4, CHECK_0); |
| } else { |
| assert(4 <= _buffer_end - _current, "buffer overflow"); |
| } |
| const u1* tmp = _current; |
| _current += 4; |
| return Bytes::get_Java_u4((address)tmp); |
| } |
| |
| u8 ClassFileStream::get_u8(TRAPS) const { |
| if (_need_verify) { |
| guarantee_more(8, CHECK_0); |
| } else { |
| assert(8 <= _buffer_end - _current, "buffer overflow"); |
| } |
| const u1* tmp = _current; |
| _current += 8; |
| return Bytes::get_Java_u8((address)tmp); |
| } |
| |
| void ClassFileStream::skip_u1(int length, TRAPS) const { |
| if (_need_verify) { |
| guarantee_more(length, CHECK); |
| } |
| _current += length; |
| } |
| |
| void ClassFileStream::skip_u2(int length, TRAPS) const { |
| if (_need_verify) { |
| guarantee_more(length * 2, CHECK); |
| } |
| _current += length * 2; |
| } |
| |
| void ClassFileStream::skip_u4(int length, TRAPS) const { |
| if (_need_verify) { |
| guarantee_more(length * 4, CHECK); |
| } |
| _current += length * 4; |
| } |
| |
| uint64_t ClassFileStream::compute_fingerprint() const { |
| int classfile_size = length(); |
| int classfile_crc = ClassLoader::crc32(0, (const char*)buffer(), length()); |
| uint64_t fingerprint = (uint64_t(classfile_size) << 32) | uint64_t(uint32_t(classfile_crc)); |
| assert(fingerprint != 0, "must not be zero"); |
| |
| return fingerprint; |
| } |