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
|
/******************************************************************************
*
* Project: OpenCPN
* Purpose: Support XZ compressed charts
* Author: Sean D'Epagnier
*
***************************************************************************
* Copyright (C) 2016 by David S. Register *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************
*
*/
#include "config.h"
#ifdef OCPN_USE_LZMA
#include <lzma.h>
// this implements a non-seekable input stream of xz compressed file
class wxCompressedFFileInputStream : public wxInputStream
{
public:
wxCompressedFFileInputStream(const wxString& fileName);
virtual ~wxCompressedFFileInputStream();
virtual bool IsOk() const { return wxStreamBase::IsOk() && m_file->IsOpened(); }
bool IsSeekable() const { return false; }
protected:
size_t OnSysRead(void *buffer, size_t size);
wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
wxFileOffset OnSysTell() const;
wxFFile *m_file;
lzma_stream strm;
private:
void init_lzma();
uint8_t inbuf[BUFSIZ];
wxDECLARE_NO_COPY_CLASS(wxCompressedFFileInputStream);
};
// non-seekable stream for either non-compressed or compressed files
class ChartDataNonSeekableInputStream : public wxInputStream
{
public:
ChartDataNonSeekableInputStream(const wxString& fileName);
virtual ~ChartDataNonSeekableInputStream();
virtual bool IsOk() const { return m_stream->IsOk(); }
bool IsSeekable() const { return false; }
protected:
size_t OnSysRead(void *buffer, size_t size);
wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
wxFileOffset OnSysTell() const;
private:
wxInputStream *m_stream;
wxDECLARE_NO_COPY_CLASS(ChartDataNonSeekableInputStream);
};
// seekable stream for either non-compressed or compressed files
// it must decompress the file to a temporary file to make it seekable
class ChartDataInputStream : public wxInputStream
{
public:
ChartDataInputStream(const wxString& fileName);
virtual ~ChartDataInputStream();
virtual bool IsOk() const { return m_stream->IsOk(); }
bool IsSeekable() const { return m_stream->IsSeekable(); }
wxString TempFileName() const { return m_tempfilename; }
protected:
size_t OnSysRead(void *buffer, size_t size);
wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
wxFileOffset OnSysTell() const;
private:
wxString m_tempfilename;
wxInputStream *m_stream;
wxDECLARE_NO_COPY_CLASS(ChartDataInputStream);
};
#else
typedef wxFFileInputStream ChartDataInputStream;
typedef wxFFileInputStream ChartDataNonSeekableInputStream;
#endif // OCPN_USE_LZMA
bool DecompressXZFile(const wxString &input_path, const wxString &output_path);
|
