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
|
/**
* @file lliobuffer.h
* @author Phoenix
* @date 2005-05-04
* @brief Declaration of buffers for use in IO Pipes.
*
* Copyright (c) 2005-2007, Linden Research, Inc.
*
* 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://secondlife.com/developers/opensource/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://secondlife.com/developers/opensource/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.
*/
#ifndef LL_LLIOBUFFER_H
#define LL_LLIOBUFFER_H
#include "lliopipe.h"
/**
* @class LLIOBuffer
* @brief This class is an io class that represents an automtically
* resizing io buffer.
* @see LLIOPipe
*
* This class is currently impelemented quick and dirty, but should be
* correct. This class should be extended to have a more flexible
* (and capped) memory allocation and usage scheme. Eventually, I
* would like to have the ability to share this buffer between
* different objects.
*/
class LLIOBuffer : public LLIOPipe
{
public:
LLIOBuffer();
virtual ~LLIOBuffer();
/**
* @brief Return a raw pointer to the current data set.
*
* The pointer returned can be used for reading or even adjustment
* if you are a bit crazy up to size() bytes into memory.
* @return A potentially NULL pointer to the raw buffer data
*/
U8* data() const;
/**
* @brief Return the size of the buffer
*/
S64 size() const;
/**
* @brief Return a raw pointer to the current read position in the data.
*
* The pointer returned can be used for reading or even adjustment
* if you are a bit crazy up to bytesLeft() bytes into memory.
* @return A potentially NULL pointer to the buffer data starting
* at the read point
*/
U8* current() const;
/**
* @brief Return the number of unprocessed bytes in buffer.
*/
S64 bytesLeft() const;
/**
* @brief Move the buffer offsets back to the beginning.
*
* This method effectively clears what has been stored here,
* without mucking around with memory allocation.
*/
void clear();
/**
* @brief Enumeration passed into the seek function
*
* The READ head is used for where to start processing data for
* the next link in the chain, while the WRITE head specifies
* where new data processed from the previous link in the chain
* will be written.
*/
enum EHead
{
READ,
WRITE
};
/**
* @brief Seek to a place in the buffer
*
* @param head The READ or WRITE head.
* @param delta The offset from the current position to seek.
* @return The status of the operation. status >= if head moved.
*/
EStatus seek(EHead head, S64 delta);
public:
/* @name LLIOPipe virtual implementations
*/
//@{
protected:
/**
* @brief Process the data in buffer
*/
virtual EStatus process_impl(
const LLChannelDescriptors& channels,
buffer_ptr_t& buffer,
bool& eos,
LLSD& context,
LLPumpIO* pump);
//@}
protected:
U8* mBuffer;
S64 mBufferSize;
U8* mReadHead;
U8* mWriteHead;
};
#endif // LL_LLIOBUFFER_H
|
