dolphin/Source/Core/Common/Src/ChunkFile.h

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// Copyright (C) 2003-2009 Dolphin Project.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License 2.0 for more details.
// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/
// Official SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/
#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 <stdio.h>
#include <map>
#include <vector>
#include <string>
#include "Common.h"
#include "FileUtil.h"
template <class T>
struct LinkedListItem : public T
{
LinkedListItem<T> *next;
};
// Wrapper class
class PointerWrap
{
public:
enum Mode {
MODE_READ = 1,
MODE_WRITE,
MODE_MEASURE,
};
u8 **ptr;
Mode mode;
public:
PointerWrap(u8 **ptr_, Mode mode_) : ptr(ptr_), mode(mode_) {}
PointerWrap(unsigned char **ptr_, int mode_) : ptr((u8**)ptr_), mode((Mode)mode_) {}
void SetMode(Mode mode_) {mode = mode_;}
Mode GetMode() const {return mode;}
u8 **GetPPtr() {return ptr;}
void DoVoid(void *data, int size)
{
switch (mode) {
case MODE_READ: memcpy(data, *ptr, size); break;
case MODE_WRITE: memcpy(*ptr, data, size); break;
case MODE_MEASURE: break; // MODE_MEASURE - don't need to do anything
default: break; // throw an error?
}
(*ptr) += size;
}
// Store maps to file. Very useful.
template<class T>
void Do(std::map<unsigned int, T> &x) {
// TODO
PanicAlert("Do(map<>) does not yet work.");
}
// Store vectors.
template<class T>
void Do(std::vector<T> &x) {
// TODO
PanicAlert("Do(vector<>) does not yet work.");
}
// Store strings.
void Do(std::string &x)
{
int stringLen = (int)x.length() + 1;
Do(stringLen);
switch (mode) {
case MODE_READ: x = (char*)*ptr; break;
case MODE_WRITE: memcpy(*ptr, x.c_str(), stringLen); break;
case MODE_MEASURE: break;
}
(*ptr) += stringLen;
}
void DoBuffer(u8** pBuffer, u32& _Size)
{
Do(_Size);
if (_Size > 0) {
switch (mode) {
case MODE_READ: *pBuffer = new u8[_Size]; memcpy(*pBuffer, *ptr, _Size); break;
case MODE_WRITE: memcpy(*ptr, *pBuffer, _Size); break;
case MODE_MEASURE: break;
}
} else {
*pBuffer = NULL;
}
(*ptr) += _Size;
}
template<class T>
void DoArray(T *x, int count) {
DoVoid((void *)x, sizeof(T) * count);
}
template<class T>
void Do(T &x) {
DoVoid((void *)&x, sizeof(x));
}
template<class T>
void DoLinkedList(LinkedListItem<T> **list_start) {
// TODO
PanicAlert("Do(linked list<>) does not yet work.");
}
};
class CChunkFileReader
{
public:
// Load file template
template<class T>
static bool Load(const std::string& _rFilename, int _Revision, T& _class)
{
INFO_LOG(COMMON, "ChunkReader: Loading %s" , _rFilename.c_str());
if (! File::Exists(_rFilename.c_str()))
return false;
// Check file size
u64 fileSize = File::GetSize(_rFilename.c_str());
u64 headerSize = sizeof(SChunkHeader);
if (fileSize < headerSize) {
ERROR_LOG(COMMON,"ChunkReader: File too small");
return false;
}
FILE* pFile = fopen(_rFilename.c_str(), "rb");
if (!pFile) {
ERROR_LOG(COMMON,"ChunkReader: Can't open file for reading");
return false;
}
// read the header
SChunkHeader header;
if (fread(&header, 1, headerSize, pFile) != headerSize) {
fclose(pFile);
ERROR_LOG(COMMON,"ChunkReader: Bad header size");
return false;
}
// Check revision
if (header.Revision != _Revision) {
fclose(pFile);
ERROR_LOG(COMMON,"ChunkReader: Wrong file revision, got %d expected %d",
header.Revision, _Revision);
return false;
}
// get size
int sz = (int)(fileSize - headerSize);
if (header.ExpectedSize != sz) {
fclose(pFile);
ERROR_LOG(COMMON,"ChunkReader: Bad file size, got %d expected %d",
sz, header.ExpectedSize);
return false;
}
// read the state
u8* buffer = new u8[sz];
if ((int)fread(buffer, 1, sz, pFile) != sz) {
fclose(pFile);
ERROR_LOG(COMMON,"ChunkReader: Error reading file");
return false;
}
// done reading
if (fclose(pFile)) {
ERROR_LOG(COMMON,"ChunkReader: Error closing file! might be corrupted!");
// should never happen!
return false;
}
u8 *ptr = buffer;
PointerWrap p(&ptr, PointerWrap::MODE_READ);
_class.DoState(p);
delete [] buffer;
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, int _Revision, T& _class)
{
FILE* pFile;
INFO_LOG(COMMON, "ChunkReader: Writing %s" , _rFilename.c_str());
pFile = fopen(_rFilename.c_str(), "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 sz = (size_t)ptr;
u8 *buffer = new u8[sz];
ptr = buffer;
p.SetMode(PointerWrap::MODE_WRITE);
_class.DoState(p);
// Create header
SChunkHeader header;
header.Compress = 0;
header.Revision = _Revision;
header.ExpectedSize = (int)sz;
// Write to file
if (fwrite(&header, sizeof(SChunkHeader), 1, pFile) != 1) {
ERROR_LOG(COMMON,"ChunkReader: Failed writing header");
return false;
}
if (fwrite(buffer, sz, 1, pFile) != 1) {
ERROR_LOG(COMMON,"ChunkReader: Failed writing data");
return false;
}
if (fclose(pFile)) {
ERROR_LOG(COMMON,"ChunkReader: Error closing file! might be corrupted!");
return false;
}
INFO_LOG(COMMON,"ChunkReader: Done writing %s",
_rFilename.c_str());
return true;
}
private:
struct SChunkHeader
{
int Revision;
int Compress;
int ExpectedSize;
};
};
#endif // _POINTERWRAP_H_