aboutsummaryrefslogtreecommitdiffstats
path: root/parameter/BinaryStream.cpp
blob: 701e9b835686e50cc6bf6a694599d111271ef184 (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
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
159
160
161
162
163
164
165
166
167
168
169
170
171
172
/*
 * Copyright (c) 2011-2014, Intel Corporation
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation and/or
 * other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include "BinaryStream.h"
#include <string.h>
#include <assert.h>

using namespace std;

CBinaryStream::CBinaryStream(const string& strFileName, bool bOut, uint32_t uiDataSize, uint8_t uiStructureChecksum) :
    _strFileName(strFileName),
    _bOut(bOut),
    _uiDataSize(uiDataSize),
    _uiStructureChecksum(uiStructureChecksum),
    _puiData(new uint8_t[uiDataSize]),
    _uiPos(0),
    _bOpen(false)
{
}

CBinaryStream::~CBinaryStream()
{
    if (_bOpen) {

        close();
    }

    delete [] _puiData;
}

bool CBinaryStream::open(string& strError)
{
    assert(!_bOpen);

    _fileStream.open(_strFileName.c_str(), (_bOut ? ios::out : ios::in|ios::ate)|ios::binary);

    if (!_fileStream.is_open() || !_fileStream.good()) {

        strError = string("Failed to ") + (_bOut ? "write" : "read") + "-open";

        return false;
    }
    if (!_bOut) {

        // Get file size
        ifstream::pos_type uiFileSize = _fileStream.tellg();

        // Validate file size
        if (_uiDataSize + sizeof(_uiStructureChecksum) != (uint32_t)uiFileSize) {

            // Size different from expected
            strError = "Unexpected file size";

            return false;
        }

        // Back to beginning of file
        _fileStream.seekg(0, ios::beg);

        // Get data
        _fileStream.read((char*)_puiData, _uiDataSize);

        // File checksum
        uint8_t uiFileChecksum;
        _fileStream.read((char*)&uiFileChecksum, sizeof(uiFileChecksum));

        // Data checksum
        uint8_t uiDataChecksum = computeChecksum();

        // Validate checksum
        if (uiDataChecksum != uiFileChecksum) {

            strError = "Integrity checks failed";

            return false;
        }
    }

    // Keep track
    _bOpen = true;

    return true;
}

void CBinaryStream::close()
{
    assert(_bOpen);

    if (_bOut) {

        // Get data
        _fileStream.write((const char*)_puiData, _uiDataSize);

        // Compute checksum
        uint8_t uiDataChecksum = computeChecksum();

        // Write checksum
        _fileStream.write((const char*)&uiDataChecksum, sizeof(uiDataChecksum));
    }

    // Keep track
    _bOpen = false;

    // Close file
    _fileStream.close();
}

void CBinaryStream::reset()
{
    _uiPos = 0;
}

void CBinaryStream::write(const uint8_t* puiData, uint32_t uiSize)
{
    assert(_uiPos + uiSize <= _uiDataSize);

    memcpy(&_puiData[_uiPos], puiData, uiSize);

    _uiPos += uiSize;
}

void CBinaryStream::read(uint8_t* puiData, uint32_t uiSize)
{
    assert(_uiPos + uiSize <= _uiDataSize);

    memcpy(puiData, &_puiData[_uiPos], uiSize);

    _uiPos += uiSize;
}

uint8_t CBinaryStream::computeChecksum() const
{
    uint32_t uiIndex;
    uint8_t uiDataChecksum = _uiStructureChecksum;

    for (uiIndex = 0; uiIndex < _uiDataSize; uiIndex++) {

        uiDataChecksum += _puiData[uiIndex];
    }
    return uiDataChecksum;
}

bool CBinaryStream::isOut() const
{
    return _bOut;
}