duke@435: /*
mikael@6198:  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #include "precompiled.hpp"
stefank@2314: #include "classfile/classFileStream.hpp"
stefank@2314: #include "classfile/vmSymbols.hpp"
duke@435: 
duke@435: void ClassFileStream::truncated_file_error(TRAPS) {
duke@435:   THROW_MSG(vmSymbols::java_lang_ClassFormatError(), "Truncated class file");
duke@435: }
duke@435: 
duke@435: ClassFileStream::ClassFileStream(u1* buffer, int length, char* source) {
duke@435:   _buffer_start = buffer;
duke@435:   _buffer_end   = buffer + length;
duke@435:   _current      = buffer;
duke@435:   _source       = source;
duke@435:   _need_verify  = false;
duke@435: }
duke@435: 
duke@435: u1 ClassFileStream::get_u1(TRAPS) {
duke@435:   if (_need_verify) {
duke@435:     guarantee_more(1, CHECK_0);
duke@435:   } else {
duke@435:     assert(1 <= _buffer_end - _current, "buffer overflow");
duke@435:   }
duke@435:   return *_current++;
duke@435: }
duke@435: 
duke@435: u2 ClassFileStream::get_u2(TRAPS) {
duke@435:   if (_need_verify) {
duke@435:     guarantee_more(2, CHECK_0);
duke@435:   } else {
duke@435:     assert(2 <= _buffer_end - _current, "buffer overflow");
duke@435:   }
duke@435:   u1* tmp = _current;
duke@435:   _current += 2;
duke@435:   return Bytes::get_Java_u2(tmp);
duke@435: }
duke@435: 
duke@435: u4 ClassFileStream::get_u4(TRAPS) {
duke@435:   if (_need_verify) {
duke@435:     guarantee_more(4, CHECK_0);
duke@435:   } else {
duke@435:     assert(4 <= _buffer_end - _current, "buffer overflow");
duke@435:   }
duke@435:   u1* tmp = _current;
duke@435:   _current += 4;
duke@435:   return Bytes::get_Java_u4(tmp);
duke@435: }
duke@435: 
duke@435: u8 ClassFileStream::get_u8(TRAPS) {
duke@435:   if (_need_verify) {
duke@435:     guarantee_more(8, CHECK_0);
duke@435:   } else {
duke@435:     assert(8 <= _buffer_end - _current, "buffer overflow");
duke@435:   }
duke@435:   u1* tmp = _current;
duke@435:   _current += 8;
duke@435:   return Bytes::get_Java_u8(tmp);
duke@435: }
duke@435: 
duke@435: void ClassFileStream::skip_u1(int length, TRAPS) {
duke@435:   if (_need_verify) {
duke@435:     guarantee_more(length, CHECK);
duke@435:   }
duke@435:   _current += length;
duke@435: }
duke@435: 
duke@435: void ClassFileStream::skip_u2(int length, TRAPS) {
duke@435:   if (_need_verify) {
duke@435:     guarantee_more(length * 2, CHECK);
duke@435:   }
duke@435:   _current += length * 2;
duke@435: }
coleenp@4398: 
coleenp@4398: void ClassFileStream::skip_u4(int length, TRAPS) {
coleenp@4398:   if (_need_verify) {
coleenp@4398:     guarantee_more(length * 4, CHECK);
coleenp@4398:   }
coleenp@4398:   _current += length * 4;
coleenp@4398: }