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
|
/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef _7ZIP_ARCHIVE_H
#define _7ZIP_ARCHIVE_H
extern "C" {
#include "lib/7z/7zFile.h"
#include "lib/7z/7z.h"
}
#include "IArchiveFactory.h"
#include "BufferedArchive.h"
#include <vector>
#include <string>
#include "IArchive.h"
/**
* Creates LZMA/7zip compressed, single-file archives.
* @see CSevenZipArchive
*/
class CSevenZipArchiveFactory : public IArchiveFactory {
public:
CSevenZipArchiveFactory(): IArchiveFactory("sd7") {}
bool CheckForSolid() const { return true; }
private:
IArchive* DoCreateArchive(const std::string& filePath) const override;
};
/**
* An LZMA/7zip compressed, single-file archive.
*/
class CSevenZipArchive : public CBufferedArchive
{
public:
CSevenZipArchive(const std::string& name);
virtual ~CSevenZipArchive();
int GetType() const override { return ARCHIVE_TYPE_SD7; }
bool IsOpen() override { return isOpen; }
bool HasLowReadingCost(unsigned int fid) const override;
unsigned int NumFiles() const override { return (fileEntries.size()); }
int GetFileImpl(unsigned int fid, std::vector<std::uint8_t>& buffer) override;
void FileInfo(unsigned int fid, std::string& name, int& size) const override;
#if 0
unsigned GetCrc32(unsigned int fid) {
assert(IsFileId(fid));
return fileEntries[fid].crc;
}
#endif
private:
int GetFileName(const CSzArEx* db, int i);
private:
/**
* How much more unpacked data may be allowed in a solid block,
* besides a meta-file.
* @see FileEntry#size
* @see FileEntry#unpackedSize
*/
static constexpr size_t COST_LIMIT_UNPACK_OVERSIZE = 32 * 1024;
/**
* Maximum allowed packed data allowed in a solid block
* that contains a meta-file.
* This is only checked for if the unpack-oversize limit was not met.
* @see FileEntry#size
* @see FileEntry#unpackedSize
*/
static constexpr size_t COST_LIMIT_DISK_READ = 32 * 1024;
// actual data is in BufferedArchive
struct FileEntry {
int fp;
/**
* Real/unpacked size of the file in bytes.
* @see #unpackedSize
* @see #packedSize
*/
int size;
std::string origName;
unsigned int crc;
/**
* How many bytes of files have to be unpacked to get to this file.
* This either equal to size, or is larger, if there are other files
* in the same solid block.
* @see #size
* @see #packedSize
*/
int unpackedSize;
/**
* How many bytes of the archive have to be read
* from disc to get to this file.
* This may be smaller or larger then size,
* and is smaller then or equal to unpackedSize.
* @see #size
* @see #unpackedSize
*/
int packedSize;
};
std::vector<FileEntry> fileEntries;
UInt32 blockIndex = 0xFFFFFFFF;
size_t outBufferSize = 0;
Byte* outBuffer = nullptr;
// used for file names
UInt16 tempBuffer[2048];
CFileInStream archiveStream;
CSzArEx db;
CLookToRead lookStream;
ISzAlloc allocImp;
ISzAlloc allocTempImp;
bool isOpen = false;
};
#endif // _7ZIP_ARCHIVE_H
|
