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
|
////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2016 Laurent Gomila (laurent@sfml-dev.org)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/System/MemoryInputStream.hpp>
#include <cstring>
namespace sf
{
////////////////////////////////////////////////////////////
MemoryInputStream::MemoryInputStream() :
m_data (NULL),
m_size (0),
m_offset(0)
{
}
////////////////////////////////////////////////////////////
void MemoryInputStream::open(const void* data, std::size_t sizeInBytes)
{
m_data = static_cast<const char*>(data);
m_size = sizeInBytes;
m_offset = 0;
}
////////////////////////////////////////////////////////////
Int64 MemoryInputStream::read(void* data, Int64 size)
{
if (!m_data)
return -1;
Int64 endPosition = m_offset + size;
Int64 count = endPosition <= m_size ? size : m_size - m_offset;
if (count > 0)
{
std::memcpy(data, m_data + m_offset, static_cast<std::size_t>(count));
m_offset += count;
}
return count;
}
////////////////////////////////////////////////////////////
Int64 MemoryInputStream::seek(Int64 position)
{
if (!m_data)
return -1;
m_offset = position < m_size ? position : m_size;
return m_offset;
}
////////////////////////////////////////////////////////////
Int64 MemoryInputStream::tell()
{
if (!m_data)
return -1;
return m_offset;
}
////////////////////////////////////////////////////////////
Int64 MemoryInputStream::getSize()
{
if (!m_data)
return -1;
return m_size;
}
} // namespace sf
|
