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
|
/*****************************************************************************
**
** Name: DataQueue.cpp
**
** Description: Store data bytes in a variable-size queue.
**
** Copyright (c) 2012, Broadcom Corp., All Rights Reserved.
** Proprietary and confidential.
**
*****************************************************************************/
#include "DataQueue.h"
/*******************************************************************************
**
** Function: DataQueue
**
** Description: Initialize member variables.
**
** Returns: None.
**
*******************************************************************************/
DataQueue::DataQueue ()
{
}
/*******************************************************************************
**
** Function: ~DataQueue
**
** Description: Release all resources.
**
** Returns: None.
**
*******************************************************************************/
DataQueue::~DataQueue ()
{
mMutex.lock ();
while (mQueue.empty() == false)
{
tHeader* header = mQueue.front ();
mQueue.pop_front ();
free (header);
}
mMutex.unlock ();
}
bool DataQueue::isEmpty()
{
mMutex.lock ();
bool retval = mQueue.empty();
mMutex.unlock ();
return retval;
}
/*******************************************************************************
**
** Function: enqueue
**
** Description: Append data to the queue.
** data: array of bytes
** dataLen: length of the data.
**
** Returns: True if ok.
**
*******************************************************************************/
bool DataQueue::enqueue (UINT8* data, UINT16 dataLen)
{
if ((data == NULL) || (dataLen==0))
return false;
mMutex.lock ();
bool retval = false;
tHeader* header = (tHeader*) malloc (sizeof(tHeader) + dataLen);
if (header)
{
memset (header, 0, sizeof(tHeader));
header->mDataLen = dataLen;
memcpy (header+1, data, dataLen);
mQueue.push_back (header);
retval = true;
}
else
{
ALOGE ("DataQueue::enqueue: out of memory ?????");
}
mMutex.unlock ();
return retval;
}
/*******************************************************************************
**
** Function: dequeue
**
** Description: Retrieve and remove data from the front of the queue.
** buffer: array to store the data.
** bufferMaxLen: maximum size of the buffer.
** actualLen: actual length of the data.
**
** Returns: True if ok.
**
*******************************************************************************/
bool DataQueue::dequeue (UINT8* buffer, UINT16 bufferMaxLen, UINT16& actualLen)
{
mMutex.lock ();
tHeader* header = mQueue.front ();
bool retval = false;
if (header && buffer && (bufferMaxLen>0))
{
if (header->mDataLen <= bufferMaxLen)
{
//caller's buffer is big enough to store all data
actualLen = header->mDataLen;
char* src = (char*)(header) + sizeof(tHeader) + header->mOffset;
memcpy (buffer, src, actualLen);
mQueue.pop_front ();
free (header);
}
else
{
//caller's buffer is too small
actualLen = bufferMaxLen;
char* src = (char*)(header) + sizeof(tHeader) + header->mOffset;
memcpy (buffer, src, actualLen);
//adjust offset so the next dequeue() will get the remainder
header->mDataLen -= actualLen;
header->mOffset += actualLen;
}
retval = true;
}
mMutex.unlock ();
return retval;
}
|
