yuzu-android/src/common/src/chunk_file.h

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// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.
#ifndef _POINTERWRAP_H_
#define _POINTERWRAP_H_
// Extremely simple serialization framework.
// (mis)-features:
// + Super fast
// + Very simple
// + Same code is used for serialization and deserializaition (in most cases)
// - Zero backwards/forwards compatibility
// - Serialization code for anything complex has to be manually written.
#include <map>
#include <vector>
#include <list>
#include <deque>
#include <string>
#include <type_traits>
#include "common.h"
#include "file_util.h"
template <class T>
struct LinkedListItem : public T
{
LinkedListItem<T> *next;
};
// Wrapper class
class PointerWrap
{
public:
enum Mode
{
MODE_READ = 1, // load
MODE_WRITE, // save
MODE_MEASURE, // calculate size
MODE_VERIFY, // compare
};
u8 **ptr;
Mode mode;
public:
PointerWrap(u8 **ptr_, Mode mode_) : ptr(ptr_), mode(mode_) {}
void SetMode(Mode mode_) { mode = mode_; }
Mode GetMode() const { return mode; }
u8** GetPPtr() { return ptr; }
template <typename K, class V>
void Do(std::map<K, V>& x)
{
u32 count = (u32)x.size();
Do(count);
switch (mode)
{
case MODE_READ:
for (x.clear(); count != 0; --count)
{
std::pair<K, V> pair;
Do(pair.first);
Do(pair.second);
x.insert(pair);
}
break;
case MODE_WRITE:
case MODE_MEASURE:
case MODE_VERIFY:
for (auto itr = x.begin(); itr != x.end(); ++itr)
{
Do(itr->first);
Do(itr->second);
}
break;
}
}
template <typename T>
void DoContainer(T& x)
{
u32 size = (u32)x.size();
Do(size);
x.resize(size);
for (auto itr = x.begin(); itr != x.end(); ++itr)
Do(*itr);
}
template <typename T>
void Do(std::vector<T>& x)
{
DoContainer(x);
}
template <typename T>
void Do(std::list<T>& x)
{
DoContainer(x);
}
template <typename T>
void Do(std::deque<T>& x)
{
DoContainer(x);
}
template <typename T>
void Do(std::basic_string<T>& x)
{
DoContainer(x);
}
template <typename T>
void DoArray(T* x, u32 count)
{
for (u32 i = 0; i != count; ++i)
Do(x[i]);
}
template <typename T>
void Do(T& x)
{
// Ideally this would be std::is_trivially_copyable, but not enough support yet
static_assert(std::is_pod<T>::value, "Only sane for POD types");
DoVoid((void*)&x, sizeof(x));
}
template <typename T>
void DoPOD(T& x)
{
DoVoid((void*)&x, sizeof(x));
}
template <typename T>
void DoPointer(T*& x, T* const base)
{
// pointers can be more than 2^31 apart, but you're using this function wrong if you need that much range
s32 offset = x - base;
Do(offset);
if (mode == MODE_READ)
x = base + offset;
}
// Let's pretend std::list doesn't exist!
template <class T, LinkedListItem<T>* (*TNew)(), void (*TFree)(LinkedListItem<T>*), void (*TDo)(PointerWrap&, T*)>
void DoLinkedList(LinkedListItem<T>*& list_start, LinkedListItem<T>** list_end=0)
{
LinkedListItem<T>* list_cur = list_start;
LinkedListItem<T>* prev = 0;
while (true)
{
u8 shouldExist = (list_cur ? 1 : 0);
Do(shouldExist);
if (shouldExist == 1)
{
LinkedListItem<T>* cur = list_cur ? list_cur : TNew();
TDo(*this, (T*)cur);
if (!list_cur)
{
if (mode == MODE_READ)
{
cur->next = 0;
list_cur = cur;
if (prev)
prev->next = cur;
else
list_start = cur;
}
else
{
TFree(cur);
continue;
}
}
}
else
{
if (mode == MODE_READ)
{
if (prev)
prev->next = 0;
if (list_end)
*list_end = prev;
if (list_cur)
{
if (list_start == list_cur)
list_start = 0;
do
{
LinkedListItem<T>* next = list_cur->next;
TFree(list_cur);
list_cur = next;
}
while (list_cur);
}
}
break;
}
prev = list_cur;
list_cur = list_cur->next;
}
}
void DoMarker(const char* prevName, u32 arbitraryNumber = 0x42)
{
u32 cookie = arbitraryNumber;
Do(cookie);
if (mode == PointerWrap::MODE_READ && cookie != arbitraryNumber)
{
PanicAlertT("Error: After \"%s\", found %d (0x%X) instead of save marker %d (0x%X). Aborting savestate load...",
prevName, cookie, cookie, arbitraryNumber, arbitraryNumber);
mode = PointerWrap::MODE_MEASURE;
}
}
private:
__forceinline void DoByte(u8& x)
{
switch (mode)
{
case MODE_READ:
x = **ptr;
break;
case MODE_WRITE:
**ptr = x;
break;
case MODE_MEASURE:
break;
case MODE_VERIFY:
_dbg_assert_msg_(COMMON, (x == **ptr),
"Savestate verification failure: %d (0x%X) (at %p) != %d (0x%X) (at %p).\n",
x, x, &x, **ptr, **ptr, *ptr);
break;
default:
break;
}
++(*ptr);
}
void DoVoid(void *data, u32 size)
{
for(u32 i = 0; i != size; ++i)
DoByte(reinterpret_cast<u8*>(data)[i]);
}
};
class CChunkFileReader
{
public:
// Load file template
template<class T>
static bool Load(const std::string& _rFilename, u32 _Revision, T& _class)
{
INFO_LOG(COMMON, "ChunkReader: Loading %s" , _rFilename.c_str());
if (!File::Exists(_rFilename))
return false;
// Check file size
const u64 fileSize = File::GetSize(_rFilename);
static const u64 headerSize = sizeof(SChunkHeader);
if (fileSize < headerSize)
{
ERROR_LOG(COMMON,"ChunkReader: File too small");
return false;
}
File::IOFile pFile(_rFilename, "rb");
if (!pFile)
{
ERROR_LOG(COMMON,"ChunkReader: Can't open file for reading");
return false;
}
// read the header
SChunkHeader header;
if (!pFile.ReadArray(&header, 1))
{
ERROR_LOG(COMMON,"ChunkReader: Bad header size");
return false;
}
// Check revision
if (header.Revision != _Revision)
{
ERROR_LOG(COMMON,"ChunkReader: Wrong file revision, got %d expected %d",
header.Revision, _Revision);
return false;
}
// get size
const u32 sz = (u32)(fileSize - headerSize);
if (header.ExpectedSize != sz)
{
ERROR_LOG(COMMON,"ChunkReader: Bad file size, got %d expected %d",
sz, header.ExpectedSize);
return false;
}
// read the state
std::vector<u8> buffer(sz);
if (!pFile.ReadArray(&buffer[0], sz))
{
ERROR_LOG(COMMON,"ChunkReader: Error reading file");
return false;
}
u8* ptr = &buffer[0];
PointerWrap p(&ptr, PointerWrap::MODE_READ);
_class.DoState(p);
INFO_LOG(COMMON, "ChunkReader: Done loading %s" , _rFilename.c_str());
return true;
}
// Save file template
template<class T>
static bool Save(const std::string& _rFilename, u32 _Revision, T& _class)
{
INFO_LOG(COMMON, "ChunkReader: Writing %s" , _rFilename.c_str());
File::IOFile pFile(_rFilename, "wb");
if (!pFile)
{
ERROR_LOG(COMMON,"ChunkReader: Error opening file for write");
return false;
}
// Get data
u8 *ptr = 0;
PointerWrap p(&ptr, PointerWrap::MODE_MEASURE);
_class.DoState(p);
size_t const sz = (size_t)ptr;
std::vector<u8> buffer(sz);
ptr = &buffer[0];
p.SetMode(PointerWrap::MODE_WRITE);
_class.DoState(p);
// Create header
SChunkHeader header;
header.Revision = _Revision;
header.ExpectedSize = (u32)sz;
// Write to file
if (!pFile.WriteArray(&header, 1))
{
ERROR_LOG(COMMON,"ChunkReader: Failed writing header");
return false;
}
if (!pFile.WriteArray(&buffer[0], sz))
{
ERROR_LOG(COMMON,"ChunkReader: Failed writing data");
return false;
}
INFO_LOG(COMMON,"ChunkReader: Done writing %s", _rFilename.c_str());
return true;
}
private:
struct SChunkHeader
{
u32 Revision;
u32 ExpectedSize;
};
};
#endif // _POINTERWRAP_H_