/* * 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; }