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vfs_concat: Rewrite and fix ConcatenatedVfsFile

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This commit is contained in:
Zach Hilman
2018-09-19 22:00:44 -04:00
parent 3e5c3d0f16
commit 44fdac334c
2 changed files with 59 additions and 14 deletions
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34
src/core/file_sys/vfs_concat.h
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@ -4,22 +4,54 @@
#pragma once
#include <map>
#include <memory>
#include <string_view>
#include <boost/container/flat_map.hpp>
#include "core/file_sys/vfs.h"
#include "core/file_sys/vfs_static.h"
namespace FileSys {
class ConcatenatedVfsFile;
// Wrapper function to allow for more efficient handling of files.size() == 0, 1 cases.
VirtualFile ConcatenateFiles(std::vector<VirtualFile> files, std::string name = "");
// Convenience function that turns a map of offsets to files into a concatenated file, filling gaps
// with template parameter.
template <u8 filler_byte>
VirtualFile ConcatenateFiles(std::map<u64, VirtualFile> files, std::string name = "") {
if (files.empty())
return nullptr;
if (files.size() == 1)
return files.begin()->second;
for (auto iter = files.begin(); iter != --files.end();) {
const auto old = iter++;
if (old->first + old->second->GetSize() != iter->first) {
files.emplace(old->first + old->second->GetSize(),
std::make_shared<StaticVfsFile<filler_byte>>(iter->first - old->first -
old->second->GetSize()));
}
}
if (files.begin()->first != 0)
files.emplace(0, std::make_shared<StaticVfsFile<filler_byte>>(files.begin()->first));
return std::shared_ptr<VfsFile>(new ConcatenatedVfsFile(std::move(files), std::move(name)));
}
// Class that wraps multiple vfs files and concatenates them, making reads seamless. Currently
// read-only.
class ConcatenatedVfsFile : public VfsFile {
friend VirtualFile ConcatenateFiles(std::vector<VirtualFile> files, std::string name);
template <u8 filler_byte>
friend VirtualFile ConcatenateFiles(std::map<u64, VirtualFile> files, std::string name);
ConcatenatedVfsFile(std::vector<VirtualFile> files, std::string name);
ConcatenatedVfsFile(std::map<u64, VirtualFile> files, std::string name);
public:
~ConcatenatedVfsFile() override;
@ -36,7 +68,7 @@ public:
private:
// Maps starting offset to file -- more efficient.
boost::container::flat_map<u64, VirtualFile> files;
std::map<u64, VirtualFile> files;
std::string name;
};