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 <stdlib.h>
29 #include <ostream>
30 #include <functional>
31 
32 class PureMark {
33 public:
34     virtual char *getStart() = 0;
35     virtual ~PureMark(){}
36 
37 };
38 class PureRange : public PureMark{
39 public:
40     virtual char *getEnd() = 0;
41     virtual size_t getSize() = 0;
42     virtual ~PureRange(){
43 
44     }
45 };
46 
47 class Buffer : public PureRange{
48 private:
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     Buffer(size_t size);
57 
58     Buffer(char *mem, size_t size);
59 
60     Buffer(char *fileName);
61 
62     Buffer(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     virtual ~Buffer();
75 
76    // char *getPtr();
77     char *getStart() override;
78     char *getEnd() override;
79     size_t getSize() override;
80     std::string str();
81 };
82 
83 class GrowableBuffer : public Buffer {
84 public:
85     GrowableBuffer();
86 
87     GrowableBuffer(size_t size);
88 
89     GrowableBuffer(char *mem, size_t size);
90 
91     GrowableBuffer(char *fileName);
92 
93     void add(void *contents, size_t bytes);
94 
95     void add(char c);
96 
97 };