1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
// Copyright (c) 2005-2022 Jay Berkenbilt
//
// This file is part of qpdf.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Versions of qpdf prior to version 7 were released under the terms
// of version 2.0 of the Artistic License. At your option, you may
// continue to consider qpdf to be licensed under those terms. Please
// see the manual for additional information.
#ifndef PL_BUFFER_HH
#define PL_BUFFER_HH
// This pipeline accumulates the data passed to it into a memory
// buffer. Each subsequent use of this buffer appends to the data
// accumulated so far. getBuffer() may be called only after calling
// finish() and before calling any subsequent write(). At that point,
// a dynamically allocated Buffer object is returned and the internal
// buffer is reset. The caller is responsible for deleting the
// returned Buffer.
//
// For this pipeline, "next" may be null. If a next pointer is
// provided, this pipeline will also pass the data through to it.
#include <qpdf/Pipeline.hh>
#include <qpdf/PointerHolder.hh>
#include <qpdf/Buffer.hh>
#include <memory>
class Pl_Buffer: public Pipeline
{
public:
QPDF_DLL
Pl_Buffer(char const* identifier, Pipeline* next = 0);
QPDF_DLL
virtual ~Pl_Buffer();
QPDF_DLL
virtual void write(unsigned char*, size_t);
QPDF_DLL
virtual void finish();
// Each call to getBuffer() resets this object -- see notes above.
// The caller is responsible for deleting the returned Buffer
// object. See also getBufferSharedPointer() and getMallocBuffer().
QPDF_DLL
Buffer* getBuffer();
// Same as getBuffer but wraps the result in a shared pointer.
QPDF_DLL
PointerHolder<Buffer> getBufferSharedPointer();
// getMallocBuffer behaves in the same was as getBuffer except the
// buffer is allocated with malloc(), making it suitable for use
// when calling from other languages. If there is no data, *buf is
// set to a null pointer and *len is set to 0. Otherwise, *buf is
// a buffer of size *len allocated with malloc(). It is the
// caller's responsibility to call free() on the buffer.
QPDF_DLL
void getMallocBuffer(unsigned char **buf, size_t* len);
private:
class Members
{
friend class Pl_Buffer;
public:
QPDF_DLL
~Members();
private:
Members();
Members(Members const&);
bool ready;
PointerHolder<Buffer> data;
size_t total_size;
};
PointerHolder<Members> m;
};
#endif // PL_BUFFER_HH
|
