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Filesystem: Replace file info's full path with name

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Some callers (i.e. ISOProperties) don't want the full path, so giving them
it is unnecessary. Those that do want it can use GetPathFromFSTOffset.
Not storing full paths everywhere also saves a small bit of RAM and is
necessary for a later commit. The code isn't especially pretty right now
(callers need to use FST offsets...) but it'll become better later.
This commit is contained in:
JosJuice
2015-07-29 16:42:29 +02:00
parent 5021b4a567
commit 07d3a39aeb
6 changed files with 89 additions and 90 deletions
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112
Source/Core/DiscIO/FileSystemGCWii.cpp
View File

@ -22,8 +22,8 @@
namespace DiscIO
{
FileInfoGCWii::FileInfoGCWii(u64 name_offset, u64 offset, u64 file_size)
: m_NameOffset(name_offset), m_Offset(offset), m_FileSize(file_size)
FileInfoGCWii::FileInfoGCWii(u64 name_offset, u64 offset, u64 file_size, std::string name)
: m_NameOffset(name_offset), m_Offset(offset), m_FileSize(file_size), m_Name(name)
{
}
@ -55,23 +55,64 @@ u64 FileSystemGCWii::GetFileSize(const std::string& _rFullPath)
return 0;
}
std::string FileSystemGCWii::GetFileName(u64 _Address)
std::string FileSystemGCWii::GetPath(u64 _Address)
{
if (!m_Initialized)
InitFileSystem();
for (auto& fileInfo : m_FileInfoVector)
for (size_t i = 0; i < m_FileInfoVector.size(); ++i)
{
if ((fileInfo.GetOffset() <= _Address) &&
((fileInfo.GetOffset() + fileInfo.GetSize()) > _Address))
const FileInfoGCWii& file_info = m_FileInfoVector[i];
if ((file_info.GetOffset() <= _Address) &&
((file_info.GetOffset() + file_info.GetSize()) > _Address))
{
return fileInfo.m_FullPath;
return GetPathFromFSTOffset(i);
}
}
return "";
}
std::string FileSystemGCWii::GetPathFromFSTOffset(size_t file_info_offset)
{
if (!m_Initialized)
InitFileSystem();
// Root entry doesn't have a name
if (file_info_offset == 0)
return "";
const FileInfoGCWii& file_info = m_FileInfoVector[file_info_offset];
if (file_info.IsDirectory())
{
// The offset of the parent directory is stored in the current directory.
if (file_info.GetOffset() >= file_info_offset)
{
// The offset of the parent directory is supposed to be smaller than
// the current offset. If an FST is malformed and breaks that rule,
// there's a risk that parent directory pointers form a loop.
// To avoid stack overflows, this method returns.
ERROR_LOG(DISCIO, "Invalid parent offset in file system");
return "";
}
return GetPathFromFSTOffset(file_info.GetOffset()) + file_info.GetName() + "/";
}
else
{
// The parent directory can be found by searching backwards
// for a directory that contains this file.
size_t parent_offset = file_info_offset - 1;
while (!(m_FileInfoVector[parent_offset].IsDirectory() &&
m_FileInfoVector[parent_offset].GetSize() > file_info_offset))
{
parent_offset--;
}
return GetPathFromFSTOffset(parent_offset) + file_info.GetName();
}
}
u64 FileSystemGCWii::ReadFile(const std::string& _rFullPath, u8* _pBuffer, u64 _MaxBufferSize,
u64 _OffsetInFile)
{
@ -248,10 +289,10 @@ const FileInfoGCWii* FileSystemGCWii::FindFileInfo(const std::string& _rFullPath
if (!m_Initialized)
InitFileSystem();
for (auto& fileInfo : m_FileInfoVector)
for (size_t i = 0; i < m_FileInfoVector.size(); ++i)
{
if (!strcasecmp(fileInfo.m_FullPath.c_str(), _rFullPath.c_str()))
return &fileInfo;
if (!strcasecmp(GetPathFromFSTOffset(i).c_str(), _rFullPath.c_str()))
return &m_FileInfoVector[i];
}
return nullptr;
@ -290,7 +331,7 @@ void FileSystemGCWii::InitFileSystem()
if (!root_name_offset || !root_offset || !root_size)
return;
FileInfoGCWii root(*root_name_offset, static_cast<u64>(*root_offset) << m_offset_shift,
*root_size);
*root_size, "");
if (!root.IsDirectory())
return;
@ -309,53 +350,20 @@ void FileSystemGCWii::InitFileSystem()
if (m_FileInfoVector.size())
PanicAlert("Wtf?");
u64 NameTableOffset = FSTOffset;
u64 NameTableOffset = FSTOffset + (root.GetSize() * 0xC);
m_FileInfoVector.reserve((size_t)root.GetSize());
for (u32 i = 0; i < root.GetSize(); i++)
{
const u64 read_offset = FSTOffset + (i * 0xC);
const std::optional<u32> name_offset = m_rVolume->ReadSwapped<u32>(read_offset, m_partition);
const std::optional<u32> offset = m_rVolume->ReadSwapped<u32>(read_offset + 0x4, m_partition);
const std::optional<u32> size = m_rVolume->ReadSwapped<u32>(read_offset + 0x8, m_partition);
m_FileInfoVector.emplace_back(name_offset.value_or(0),
static_cast<u64>(offset.value_or(0)) << m_offset_shift,
size.value_or(0));
NameTableOffset += 0xC;
const u32 name_offset = m_rVolume->ReadSwapped<u32>(read_offset, m_partition).value_or(0);
const u32 offset = m_rVolume->ReadSwapped<u32>(read_offset + 0x4, m_partition).value_or(0);
const u32 size = m_rVolume->ReadSwapped<u32>(read_offset + 0x8, m_partition).value_or(0);
const std::string name = GetStringFromOffset(NameTableOffset + (name_offset & 0xFFFFFF));
m_FileInfoVector.emplace_back(
name_offset, static_cast<u64>(offset) << (m_offset_shift * !(name_offset & 0xFF000000)),
size, name);
}
BuildFilenames(1, m_FileInfoVector.size(), "", NameTableOffset);
}
size_t FileSystemGCWii::BuildFilenames(const size_t _FirstIndex, const size_t _LastIndex,
const std::string& _szDirectory, u64 _NameTableOffset)
{
size_t CurrentIndex = _FirstIndex;
while (CurrentIndex < _LastIndex)
{
FileInfoGCWii& rFileInfo = m_FileInfoVector[CurrentIndex];
u64 const uOffset = _NameTableOffset + (rFileInfo.m_NameOffset & 0xFFFFFF);
std::string const offset_str{GetStringFromOffset(uOffset)};
bool const is_dir = rFileInfo.IsDirectory();
rFileInfo.m_FullPath.reserve(_szDirectory.size() + offset_str.size());
rFileInfo.m_FullPath.append(_szDirectory.data(), _szDirectory.size())
.append(offset_str.data(), offset_str.size())
.append("/", size_t(is_dir));
if (!is_dir)
{
++CurrentIndex;
continue;
}
// check next index
CurrentIndex = BuildFilenames(CurrentIndex + 1, (size_t)rFileInfo.GetSize(),
rFileInfo.m_FullPath, _NameTableOffset);
}
return CurrentIndex;
}
} // namespace