1 /*
 2  * Copyright (c) 2024, 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.  Oracle designates this
 8  * particular file as subject to the "Classpath" exception as provided
 9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20  *
21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22  * or visit www.oracle.com if you need additional information or have any
23  * questions.
24  */
25 #pragma once
26 
27 #include <cstring>
28 #include <ostream>
29 #include <functional>
30 
31 class PureMark {
32 public:
33     virtual char *getStart() = 0;
34 
35     virtual ~PureMark() = default;
36 };
37 
38 class PureRange : public PureMark {
39 public:
40     virtual char *getEnd() = 0;
41 
42     virtual size_t getSize() = 0;
43 
44     ~PureRange() override {
45     }
46 };
47 
48 class Buffer : public PureRange {
49     size_t max; // max size before we need to realloc.
50 protected:
51     char *memory;
52     size_t size; // size requested
53 public:
54     Buffer();
55 
56     explicit Buffer(size_t size);
57 
58     Buffer(const char *mem, size_t size);
59 
60     explicit Buffer(const char *fileName);
61 
62     explicit Buffer(const std::string &fileName);
63 
64     void resize(size_t size);
65 
66     void dump(std::ostream &s);
67 
68     void dump(std::ostream &s, std::function<void(std::ostream &)> prefix);
69 
70     size_t write(int fd);
71 
72     size_t read(int fd, size_t size);
73 
74     ~Buffer() override;
75 
76     char *getStart() override;
77 
78     char *getEnd() override;
79 
80     size_t getSize() override;
81 
82     std::string str();
83 };
84 
85 class GrowableBuffer : public Buffer {
86 public:
87     GrowableBuffer();
88 
89     explicit GrowableBuffer(size_t size);
90 
91     GrowableBuffer(char *mem, size_t size);
92 
93     explicit GrowableBuffer(char *fileName);
94 
95     void add(void *contents, size_t bytes);
96 
97     void add(char c);
98 };