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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
// Copyright 2012 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <memory>
#include <string>
#include <vector>
#include "Common/CommonFuncs.h"
#include "Common/CommonTypes.h"
#include "Common/FileUtil.h"
#include "Common/MsgHandler.h"
#include "Common/Logging/Log.h"
#include "DiscIO/WbfsBlob.h"
namespace DiscIO
{
static const u64 WII_SECTOR_SIZE = 0x8000;
static const u64 WII_SECTOR_COUNT = 143432 * 2;
static const u64 WII_DISC_HEADER_SIZE = 256;
static inline u64 align(u64 value, u64 bounds)
{
return (value + (bounds - 1)) & (~(bounds - 1));
}
WbfsFileReader::WbfsFileReader(const std::string& filename)
: m_total_files(0), m_size(0), m_good(true)
{
if (filename.length() < 4 || !OpenFiles(filename) || !ReadHeader())
{
m_good = false;
return;
}
// Grab disc info (assume slot 0, checked in ReadHeader())
m_wlba_table.resize(m_blocks_per_disc);
m_files[0]->file.Seek(m_hd_sector_size + WII_DISC_HEADER_SIZE /*+ i * m_disc_info_size*/, SEEK_SET);
m_files[0]->file.ReadBytes(m_wlba_table.data(), m_blocks_per_disc * sizeof(u16));
for (size_t i = 0; i < m_blocks_per_disc; i++)
m_wlba_table[i] = Common::swap16(m_wlba_table[i]);
}
WbfsFileReader::~WbfsFileReader()
{
}
u64 WbfsFileReader::GetDataSize() const
{
return WII_SECTOR_COUNT * WII_SECTOR_SIZE;
}
bool WbfsFileReader::OpenFiles(const std::string& filename)
{
m_total_files = 0;
while (true)
{
auto new_entry = std::make_unique<file_entry>();
// Replace last character with index (e.g. wbfs = wbf1)
std::string path = filename;
if (m_total_files != 0)
{
path[path.length() - 1] = '0' + m_total_files;
}
if (!new_entry->file.Open(path, "rb"))
{
return m_total_files != 0;
}
new_entry->base_address = m_size;
new_entry->size = new_entry->file.GetSize();
m_size += new_entry->size;
m_total_files++;
m_files.emplace_back(std::move(new_entry));
}
}
bool WbfsFileReader::ReadHeader()
{
// Read hd size info
m_files[0]->file.ReadBytes(&m_header, sizeof(WbfsHeader));
m_header.hd_sector_count = Common::swap32(m_header.hd_sector_count);
m_hd_sector_size = 1ull << m_header.hd_sector_shift;
if (m_size != (m_header.hd_sector_count * m_hd_sector_size))
return false;
// Read wbfs cluster info
m_wbfs_sector_size = 1ull << m_header.wbfs_sector_shift;
m_wbfs_sector_count = m_size / m_wbfs_sector_size;
if (m_wbfs_sector_size < WII_SECTOR_SIZE)
return false;
m_blocks_per_disc = (WII_SECTOR_COUNT * WII_SECTOR_SIZE + m_wbfs_sector_size - 1) / m_wbfs_sector_size;
m_disc_info_size = align(WII_DISC_HEADER_SIZE + m_blocks_per_disc * sizeof(u16), m_hd_sector_size);
return m_header.disc_table[0] != 0;
}
bool WbfsFileReader::Read(u64 offset, u64 nbytes, u8* out_ptr)
{
while (nbytes)
{
u64 read_size;
File::IOFile& data_file = SeekToCluster(offset, &read_size);
if (read_size == 0)
return false;
read_size = std::min(read_size, nbytes);
if (!data_file.ReadBytes(out_ptr, read_size))
{
data_file.Clear();
return false;
}
out_ptr += read_size;
nbytes -= read_size;
offset += read_size;
}
return true;
}
File::IOFile& WbfsFileReader::SeekToCluster(u64 offset, u64* available)
{
u64 base_cluster = (offset >> m_header.wbfs_sector_shift);
if (base_cluster < m_blocks_per_disc)
{
u64 cluster_address = m_wbfs_sector_size * m_wlba_table[base_cluster];
u64 cluster_offset = offset & (m_wbfs_sector_size - 1);
u64 final_address = cluster_address + cluster_offset;
for (u32 i = 0; i != m_total_files; i++)
{
if (final_address < (m_files[i]->base_address + m_files[i]->size))
{
m_files[i]->file.Seek(final_address - m_files[i]->base_address, SEEK_SET);
if (available)
{
u64 till_end_of_file = m_files[i]->size - (final_address - m_files[i]->base_address);
u64 till_end_of_sector = m_wbfs_sector_size - cluster_offset;
*available = std::min(till_end_of_file, till_end_of_sector);
}
return m_files[i]->file;
}
}
}
PanicAlert("Read beyond end of disc");
if (available)
*available = 0;
m_files[0]->file.Seek(0, SEEK_SET);
return m_files[0]->file;
}
std::unique_ptr<WbfsFileReader> WbfsFileReader::Create(const std::string& filename)
{
auto reader = std::unique_ptr<WbfsFileReader>(new WbfsFileReader(filename));
if (!reader->IsGood())
reader.reset();
return reader;
}
bool IsWbfsBlob(const std::string& filename)
{
File::IOFile f(filename, "rb");
u8 magic[4] = {0, 0, 0, 0};
f.ReadBytes(&magic, 4);
return (magic[0] == 'W') &&
(magic[1] == 'B') &&
(magic[2] == 'F') &&
(magic[3] == 'S');
}
} // namespace
|
