blob: 837b0943b205f4f4eb85b28b740f2f55220372d4 (
plain)
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
|
/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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.
*/
#include "ReadBuffer.h"
#include <string.h>
#include <assert.h>
#include <limits.h>
#include "ErrorLog.h"
ReadBuffer::ReadBuffer(IOStream *stream, size_t bufsize)
{
m_size = bufsize;
m_stream = stream;
m_buf = (unsigned char*)malloc(m_size*sizeof(unsigned char));
m_validData = 0;
m_readPtr = m_buf;
}
ReadBuffer::~ReadBuffer()
{
free(m_buf);
}
int ReadBuffer::getData()
{
if ((m_validData > 0) && (m_readPtr > m_buf)) {
memmove(m_buf, m_readPtr, m_validData);
}
// get fresh data into the buffer;
size_t len = m_size - m_validData;
if (len==0) {
//we need to inc our buffer
size_t new_size = m_size*2;
unsigned char* new_buf;
if (new_size < m_size) { // overflow check
new_size = INT_MAX;
}
new_buf = (unsigned char*)realloc(m_buf, new_size);
if (!new_buf) {
ERR("Failed to alloc %zu bytes for ReadBuffer\n", new_size);
return -1;
}
m_size = new_size;
m_buf = new_buf;
len = m_size - m_validData;
}
m_readPtr = m_buf;
if (NULL != m_stream->read(m_buf + m_validData, &len)) {
m_validData += len;
return len;
}
return -1;
}
void ReadBuffer::consume(size_t amount)
{
assert(amount <= m_validData);
m_validData -= amount;
m_readPtr += amount;
}
|
