1 /*
2 * Copyright (c) 1997, 2014, 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 *
40 #endif
41 #ifdef TARGET_ARCH_ppc
42 # include "bytes_ppc.hpp"
43 #endif
44
45 // Input stream for reading .class file
46 //
47 // The entire input stream is present in a buffer allocated by the caller.
48 // The caller is responsible for deallocating the buffer and for using
49 // ResourceMarks appropriately when constructing streams.
50
51 class ClassFileStream: public ResourceObj {
52 private:
53 u1* _buffer_start; // Buffer bottom
54 u1* _buffer_end; // Buffer top (one past last element)
55 u1* _current; // Current buffer position
56 const char* _source; // Source of stream (directory name, ZIP/JAR archive name)
57 bool _need_verify; // True if verification is on for the class file
58
59 void truncated_file_error(TRAPS);
60 public:
61 // Constructor
62 ClassFileStream(u1* buffer, int length, const char* source);
63
64 // Buffer access
65 u1* buffer() const { return _buffer_start; }
66 int length() const { return _buffer_end - _buffer_start; }
67 u1* current() const { return _current; }
68 void set_current(u1* pos) { _current = pos; }
69 const char* source() const { return _source; }
70 void set_verify(bool flag) { _need_verify = flag; }
71
72 void check_truncated_file(bool b, TRAPS) {
73 if (b) {
74 truncated_file_error(THREAD);
75 }
76 }
77
78 void guarantee_more(int size, TRAPS) {
79 size_t remaining = (size_t)(_buffer_end - _current);
80 unsigned int usize = (unsigned int)size;
81 check_truncated_file(usize > remaining, CHECK);
82 }
83
84 // Read u1 from stream
85 u1 get_u1(TRAPS);
86 u1 get_u1_fast() {
87 return *_current++;
88 }
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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 *
40 #endif
41 #ifdef TARGET_ARCH_ppc
42 # include "bytes_ppc.hpp"
43 #endif
44
45 // Input stream for reading .class file
46 //
47 // The entire input stream is present in a buffer allocated by the caller.
48 // The caller is responsible for deallocating the buffer and for using
49 // ResourceMarks appropriately when constructing streams.
50
51 class ClassFileStream: public ResourceObj {
52 private:
53 u1* _buffer_start; // Buffer bottom
54 u1* _buffer_end; // Buffer top (one past last element)
55 u1* _current; // Current buffer position
56 const char* _source; // Source of stream (directory name, ZIP/JAR archive name)
57 bool _need_verify; // True if verification is on for the class file
58
59 void truncated_file_error(TRAPS);
60 protected:
61 const u1* clone_buffer() const;
62 const char* const clone_source() const;
63 public:
64 // Constructor
65 ClassFileStream(u1* buffer, int length, const char* source);
66
67 virtual const ClassFileStream* clone() const;
68
69 // Buffer access
70 u1* buffer() const { return _buffer_start; }
71 int length() const { return _buffer_end - _buffer_start; }
72 u1* current() const { return _current; }
73 void set_current(u1* pos) { _current = pos; }
74 // for relative positioning
75 juint current_offset() const {
76 return (juint)(_current - _buffer_start);
77 }
78 const char* source() const { return _source; }
79 void set_verify(bool flag) { _need_verify = flag; }
80
81 void check_truncated_file(bool b, TRAPS) {
82 if (b) {
83 truncated_file_error(THREAD);
84 }
85 }
86
87 void guarantee_more(int size, TRAPS) {
88 size_t remaining = (size_t)(_buffer_end - _current);
89 unsigned int usize = (unsigned int)size;
90 check_truncated_file(usize > remaining, CHECK);
91 }
92
93 // Read u1 from stream
94 u1 get_u1(TRAPS);
95 u1 get_u1_fast() {
96 return *_current++;
97 }
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