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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
/**
* @file llbufferstream.h
* @author Phoenix
* @date 2005-10-10
* @brief Classes to treat an LLBufferArray as a c++ iostream.
*
* $LicenseInfo:firstyear=2005&license=viewergpl$
*
* Copyright (c) 2005-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LL_LLBUFFERSTREAM_H
#define LL_LLBUFFERSTREAM_H
#include <iosfwd>
#include <iostream>
#include "llbuffer.h"
/**
* @class LLBufferStreamBuf
* @brief This implements the buffer wrapper for an istream
*
* The buffer array passed in is not owned by the stream buf object.
*/
class LLBufferStreamBuf : public std::streambuf
{
public:
LLBufferStreamBuf(
const LLChannelDescriptors& channels,
LLBufferArray* buffer);
virtual ~LLBufferStreamBuf();
protected:
#if( LL_WINDOWS || __GNUC__ > 2 )
typedef std::streambuf::pos_type pos_type;
typedef std::streambuf::off_type off_type;
#endif
/* @name streambuf vrtual implementations
*/
//@{
/*
* @brief called when we hit the end of input
*
* @return Returns the character at the current position or EOF.
*/
virtual int underflow();
/*
* @brief called when we hit the end of output
*
* @param c The character to store at the current put position
* @return Returns EOF if the function failed. Any other value on success.
*/
virtual int overflow(int c);
/*
* @brief synchronize the buffer
*
* @return Returns 0 on success or -1 on failure.
*/
virtual int sync();
/*
* @brief Seek to an offset position in a stream.
*
* @param off Offset value relative to way paramter
* @param way The seek direction. One of ios::beg, ios::cur, and ios::end.
* @param which Which pointer to modify. One of ios::in, ios::out,
* or both masked together.
* @return Returns the new position or an invalid position on failure.
*/
#if( LL_WINDOWS || __GNUC__ > 2)
virtual pos_type seekoff(
off_type off,
std::ios::seekdir way,
std::ios::openmode which);
#else
virtual streampos seekoff(
streamoff off,
std::ios::seekdir way,
std::ios::openmode which);
#endif
/*
* @brief Get s sequence of characters from the input
*
* @param dst Pointer to a block of memory to accept the characters
* @param length Number of characters to be read
* @return Returns the number of characters read
*/
//virtual streamsize xsgetn(char* dst, streamsize length);
/*
* @brief Write some characters to output
*
* @param src Pointer to a sequence of characters to be output
* @param length Number of characters to be put
* @return Returns the number of characters written
*/
//virtual streamsize xsputn(char* src, streamsize length);
//@}
protected:
// This channels we are working on.
LLChannelDescriptors mChannels;
// The buffer we work on
LLBufferArray* mBuffer;
};
/**
* @class LLBufferStream
* @brief This implements an istream based wrapper around an LLBufferArray.
*
* This class does not own the buffer array, and does not hold a
* shared pointer to it. Since the class itself is fairly ligthweight,
* just make one on the stack when needed and let it fall out of
* scope.
*/
class LLBufferStream : public std::iostream
{
public:
LLBufferStream(
const LLChannelDescriptors& channels,
LLBufferArray* buffer);
~LLBufferStream();
protected:
LLBufferStreamBuf mStreamBuf;
};
#endif // LL_LLBUFFERSTREAM_H
|
