blob: 8de921e8e1c1f2faeda3db15310ed4dfc108d43f (
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
|
// Copyright 2010 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include <algorithm>
#include <cstdio>
#include <memory>
#include <utility>
#include "Common/CommonTypes.h"
#include "Common/File.h"
#include "DiscIO/CISOBlob.h"
namespace DiscIO
{
CISOFileReader::CISOFileReader(File::IOFile file) : m_file(std::move(file))
{
m_size = m_file.GetSize();
CISOHeader header;
m_file.Seek(0, SEEK_SET);
m_file.ReadArray(&header, 1);
m_block_size = header.block_size;
MapType count = 0;
for (u32 idx = 0; idx < CISO_MAP_SIZE; ++idx)
m_ciso_map[idx] = (1 == header.map[idx]) ? count++ : UNUSED_BLOCK_ID;
}
std::unique_ptr<CISOFileReader> CISOFileReader::Create(File::IOFile file)
{
CISOHeader header;
if (file.Seek(0, SEEK_SET) && file.ReadArray(&header, 1) && header.magic == CISO_MAGIC)
return std::unique_ptr<CISOFileReader>(new CISOFileReader(std::move(file)));
return nullptr;
}
u64 CISOFileReader::GetDataSize() const
{
return CISO_MAP_SIZE * m_block_size;
}
u64 CISOFileReader::GetRawSize() const
{
return m_size;
}
bool CISOFileReader::Read(u64 offset, u64 nbytes, u8* out_ptr)
{
while (nbytes != 0)
{
u64 const block = offset / m_block_size;
u64 const data_offset = offset % m_block_size;
u64 const bytes_to_read = std::min(m_block_size - data_offset, nbytes);
if (block < CISO_MAP_SIZE && UNUSED_BLOCK_ID != m_ciso_map[block])
{
// calculate the base address
u64 const file_off = CISO_HEADER_SIZE + m_ciso_map[block] * (u64)m_block_size + data_offset;
if (!(m_file.Seek(file_off, SEEK_SET) && m_file.ReadArray(out_ptr, bytes_to_read)))
{
m_file.Clear();
return false;
}
}
else
{
std::fill_n(out_ptr, bytes_to_read, 0);
}
out_ptr += bytes_to_read;
offset += bytes_to_read;
nbytes -= bytes_to_read;
}
return true;
}
} // namespace DiscIO
|
