1/*
2 * Copyright (c) 1997, 2019, 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/classLoader.hpp"
28#include "classfile/dictionary.hpp"
29#include "classfile/vmSymbols.hpp"
30#include "memory/resourceArea.hpp"
31
32const bool ClassFileStream::verify = true;
33
34void ClassFileStream::truncated_file_error(TRAPS) const {
35 THROW_MSG(vmSymbols::java_lang_ClassFormatError(), "Truncated class file");
36}
37
38ClassFileStream::ClassFileStream(const u1* buffer,
39 int length,
40 const char* source,
41 bool verify_stream,
42 bool from_boot_loader_modules_image) :
43 _buffer_start(buffer),
44 _buffer_end(buffer + length),
45 _current(buffer),
46 _source(source),
47 _need_verify(verify_stream),
48 _from_boot_loader_modules_image(from_boot_loader_modules_image) {}
49
50const u1* ClassFileStream::clone_buffer() const {
51 u1* const new_buffer_start = NEW_RESOURCE_ARRAY(u1, length());
52 memcpy(new_buffer_start, _buffer_start, length());
53 return new_buffer_start;
54}
55
56const char* const ClassFileStream::clone_source() const {
57 const char* const src = source();
58 char* source_copy = NULL;
59 if (src != NULL) {
60 size_t source_len = strlen(src);
61 source_copy = NEW_RESOURCE_ARRAY(char, source_len + 1);
62 strncpy(source_copy, src, source_len + 1);
63 }
64 return source_copy;
65}
66
67// Caller responsible for ResourceMark
68// clone stream with a rewound position
69const ClassFileStream* ClassFileStream::clone() const {
70 const u1* const new_buffer_start = clone_buffer();
71 return new ClassFileStream(new_buffer_start,
72 length(),
73 clone_source(),
74 need_verify(),
75 from_boot_loader_modules_image());
76}
77
78uint64_t ClassFileStream::compute_fingerprint() const {
79 int classfile_size = length();
80 int classfile_crc = ClassLoader::crc32(0, (const char*)buffer(), length());
81 uint64_t fingerprint = (uint64_t(classfile_size) << 32) | uint64_t(uint32_t(classfile_crc));
82 assert(fingerprint != 0, "must not be zero");
83
84 return fingerprint;
85}
86