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1/*
2 * Copyright (C) 2007-2019 Xagasoft, All rights reserved.
3 *
4 * This file is part of the libbu++ library and is released under the
5 * terms of the license contained in the file LICENSE.
6 */
7
8#ifndef BU_CLIENT_BUF_H
9#define BU_CLIENT_BUF_H
10
11#include "bu/stream.h"
12#include "bu/streamstack.h"
13#include "bu/queuebuf.h"
14#include "bu/mutex.h"
15
16namespace Bu
17{
18 /**
19 * ClientBuf represents two buffered I/O channels, input and output. Each
20 * is stored in its own Bu::QueueBuf. One side is client oriented and can
21 * have filters applied ala Bu::StreamStack. The other is server oriented
22 * and is accesesed raw. Both must be accessed via accessor objects.
23 *
24 * Direct access to the buffers isn't allowed, instead you must select a
25 * perspective. client() provides an accessor where reading consumes data
26 * coming from the socket and writing provides data to write to the socket.
27 * server() works in reverse, writing is writing data from the socket that
28 * we have just read, reading is reading data that should be written to the
29 * socket.
30 *
31 * client() provides a filtered access view of the data, while server() is
32 * unfiltered.
33 */
34 class ClientBuf
35 {
36 public:
37 class ClientAccess : public Bu::Stream
38 {
39 friend class Bu::ClientBuf;
40 private:
41 ClientAccess( Bu::ClientBuf &rBuf );
42
43 public:
44 virtual ~ClientAccess();
45
46 virtual void close();
47 virtual size read( void *pBuf, size iBytes );
48 virtual size peek( void *pData, int iBytes, int iOffset=0 );
49 virtual size write( const void *pBuf, size iBytes );
50 using Stream::write;
51 virtual size tell();
52 virtual void seek( size offset );
53 virtual void setPos( size pos );
54 virtual void setPosEnd( size pos );
55 virtual bool isEos();
56 virtual bool isOpen();
57 virtual void flush();
58 virtual bool canRead();
59 virtual bool canWrite();
60 virtual bool isReadable();
61 virtual bool isWritable();
62 virtual bool isSeekable();
63 virtual bool isBlocking();
64 virtual void setBlocking( bool bBlocking=true );
65 virtual void setSize( size iSize );
66 virtual size getSize() const;
67 virtual size getBlockSize() const;
68 virtual Bu::String getLocation() const;
69
70 private:
71 Bu::ClientBuf &rBuf;
72 Bu::QueueBuf qbPeek;
73 mutable Bu::Mutex mAccess;
74 };
75
76 class ServerAccess : public Bu::Stream
77 {
78 friend class Bu::ClientBuf;
79 private:
80 ServerAccess( Bu::ClientBuf &rBuf );
81
82 public:
83 virtual ~ServerAccess();
84
85 virtual void close();
86 virtual size read( void *pBuf, size iBytes );
87 virtual size peek( void *pData, int iBytes, int iOffset=0 );
88 virtual size write( const void *pBuf, size iBytes );
89 using Stream::write;
90 virtual size tell();
91 virtual void seek( size offset );
92 virtual void setPos( size pos );
93 virtual void setPosEnd( size pos );
94 virtual bool isEos();
95 virtual bool isOpen();
96 virtual void flush();
97 virtual bool canRead();
98 virtual bool canWrite();
99 virtual bool isReadable();
100 virtual bool isWritable();
101 virtual bool isSeekable();
102 virtual bool isBlocking();
103 virtual void setBlocking( bool bBlocking=true );
104 virtual void setSize( size iSize );
105 virtual size getSize() const;
106 virtual size getBlockSize() const;
107 virtual Bu::String getLocation() const;
108
109 private:
110 Bu::ClientBuf &rBuf;
111 };
112
113 private:
114 class ClientAccessRaw : public Bu::Stream
115 {
116 friend class Bu::ClientBuf;
117 private:
118 ClientAccessRaw( Bu::ClientBuf &rBuf );
119
120 public:
121 virtual ~ClientAccessRaw();
122
123 virtual void close();
124 virtual size read( void *pBuf, size iBytes );
125 virtual size write( const void *pBuf, size iBytes );
126 using Stream::write;
127 virtual size tell();
128 virtual void seek( size offset );
129 virtual void setPos( size pos );
130 virtual void setPosEnd( size pos );
131 virtual bool isEos();
132 virtual bool isOpen();
133 virtual void flush();
134 virtual bool canRead();
135 virtual bool canWrite();
136 virtual bool isReadable();
137 virtual bool isWritable();
138 virtual bool isSeekable();
139 virtual bool isBlocking();
140 virtual void setBlocking( bool bBlocking=true );
141 virtual void setSize( size iSize );
142 virtual size getSize() const;
143 virtual size getBlockSize() const;
144 virtual Bu::String getLocation() const;
145
146 private:
147 Bu::ClientBuf &rBuf;
148 };
149
150 public:
151 ClientBuf();
152 virtual ~ClientBuf();
153
154 /**
155 * Access the client access side. Use directly, do NOT copy or store.
156 */
157 ClientAccess &client();
158
159 /**
160 * Access the server access side. Use directly, do NOT copy or store.
161 */
162 ServerAccess &server();
163
164 private:
165 ClientAccessRaw accClientRaw;
166 ServerAccess accServer;
167 Bu::StreamStack accClientFiltered;
168 ClientAccess accClient;
169 Bu::QueueBuf qbOutput;
170 Bu::QueueBuf qbInput;
171 Bu::Mutex mOutput;
172 Bu::Mutex mInput;
173 friend class Bu::ClientBuf::ClientAccess;
174 friend class Bu::ClientBuf::ClientAccessRaw;
175 friend class Bu::ClientBuf::ServerAccess;
176 };
177}
178
179#endif
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