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#include "stdafx.h"
#include "File.h"
#include "NbtSlotFile.h"
byteArray NbtSlotFile::READ_BUFFER(1024*1024);
int64_t NbtSlotFile::largest = 0;
NbtSlotFile::NbtSlotFile(File file)
{
totalFileSlots = 0;
fileSlotMapLength = ZonedChunkStorage::CHUNKS_PER_ZONE * ZonedChunkStorage::CHUNKS_PER_ZONE;
fileSlotMap = new vector<int> *[fileSlotMapLength];
if ( !file.exists() || file.length() )
{
raf = CreateFile(wstringtofilename(file.getPath()), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
writeHeader();
}
else
{
raf = CreateFile(wstringtofilename(file.getPath()), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
}
readHeader();
for (int i = 0; i < fileSlotMapLength; i++)
{
fileSlotMap[i] = new vector<int>;
}
DWORD numberofBytesRead;
for (int fileSlot = 0; fileSlot < totalFileSlots; fileSlot++)
{
seekSlotHeader(fileSlot);
short slot;
ReadFile(raf,&slot,2,&numberofBytesRead,NULL);
if (slot == 0)
{
freeFileSlots.push_back(fileSlot);
} else if (slot < 0)
{
fileSlotMap[(-slot) - 1]->push_back(fileSlot);
} else {
fileSlotMap[slot - 1]->push_back(fileSlot);
}
}
}
void NbtSlotFile::readHeader()
{
DWORD numberOfBytesRead;
SetFilePointer(raf,0,0,FILE_BEGIN);
int magic;
ReadFile(raf,&magic,4,&numberOfBytesRead,NULL);
// if (magic != MAGIC_NUMBER) throw new IOException("Bad magic number: " + magic); // 4J - TODO
short version;
ReadFile(raf,&version,2,&numberOfBytesRead,NULL);
// if (version != 0) throw new IOException("Bad version number: " + version); // 4J - TODO
ReadFile(raf,&totalFileSlots,4,&numberOfBytesRead,NULL);
}
void NbtSlotFile::writeHeader()
{
DWORD numberOfBytesWritten;
short version = 0;
SetFilePointer(raf,0,0,FILE_BEGIN);
WriteFile(raf,&MAGIC_NUMBER,4,&numberOfBytesWritten,NULL);
WriteFile(raf,&version,2,&numberOfBytesWritten,NULL);
WriteFile(raf,&totalFileSlots,4,&numberOfBytesWritten,NULL);
}
void NbtSlotFile::seekSlotHeader(int fileSlot)
{
int target = FILE_HEADER_SIZE + fileSlot * (FILE_SLOT_SIZE + FILE_SLOT_HEADER_SIZE);
SetFilePointer(raf,target,0,FILE_BEGIN);
}
void NbtSlotFile::seekSlot(int fileSlot)
{
int target = FILE_HEADER_SIZE + fileSlot * (FILE_SLOT_SIZE + FILE_SLOT_HEADER_SIZE);
SetFilePointer(raf,target+FILE_SLOT_HEADER_SIZE,0,FILE_BEGIN);
}
vector<CompoundTag *> *NbtSlotFile::readAll(int slot)
{
DWORD numberOfBytesRead;
vector<CompoundTag *> *tags = new vector<CompoundTag *>;
vector<int> *fileSlots = fileSlotMap[slot];
int skipped = 0;
for (int c : *fileSlots)
{
int pos = 0;
int continuesAt = -1;
int expectedSlot = slot + 1;
do
{
seekSlotHeader(c);
short oldSlot;
ReadFile(raf,&oldSlot,2,&numberOfBytesRead,NULL);
short size;
ReadFile(raf,&size,2,&numberOfBytesRead,NULL);
ReadFile(raf,&continuesAt,4,&numberOfBytesRead,NULL);
int lastSlot;
ReadFile(raf,&lastSlot,4,&numberOfBytesRead,NULL);
seekSlot(c);
if (expectedSlot > 0 && oldSlot == -expectedSlot)
{
skipped++;
goto fileSlotLoop; // 4J - used to be continue fileSlotLoop, with for loop labelled as fileSlotLoop
}
ReadFile(raf,READ_BUFFER.data + pos,size,&numberOfBytesRead,NULL);
if (continuesAt >= 0)
{
pos += size;
c = continuesAt;
expectedSlot = -slot - 1;
}
} while (continuesAt >= 0);
tags->push_back(NbtIo::decompress(READ_BUFFER));
fileSlotLoop:
continue;
}
return tags;
}
int NbtSlotFile::getFreeSlot()
{ int fileSlot;
// 4J - removed - don't see how toReplace can ever have anything in here, and might not be initialised
// if (toReplace->size() > 0)
// {
// fileSlot = toReplace->back();
// toReplace->pop_back();
// } else
if (freeFileSlots.size() > 0)
{
fileSlot = freeFileSlots.back();
freeFileSlots.pop_back();
}
else
{
fileSlot = totalFileSlots++;
writeHeader();
}
return fileSlot;
}
void NbtSlotFile::replaceSlot(int slot, vector<CompoundTag *> *tags)
{
DWORD numberOfBytesWritten;
toReplace = fileSlotMap[slot];
fileSlotMap[slot] = new vector<int>();
for (auto tag : *tags)
{
byteArray compressed = NbtIo::compress(tag);
if (compressed.length > largest)
{
wchar_t buf[256];
largest = compressed.length;
#ifndef _CONTENT_PACKAGE
swprintf(buf, 256, L"New largest: %I64d (%ls)\n",largest,tag->getString(L"id").c_str() );
OutputDebugStringW(buf);
#endif
}
int pos = 0;
int remaining = compressed.length;
if (remaining == 0) continue;
int nextFileSlot = getFreeSlot();
short currentSlot = slot + 1;
int lastFileSlot = -1;
while (remaining > 0)
{
int fileSlot = nextFileSlot;
fileSlotMap[slot]->push_back(fileSlot);
short toWrite = remaining;
if (toWrite > FILE_SLOT_SIZE)
{
toWrite = FILE_SLOT_SIZE;
}
remaining -= toWrite;
if (remaining > 0)
{
nextFileSlot = getFreeSlot();
}
else
{
nextFileSlot = -1;
}
seekSlotHeader(fileSlot);
WriteFile(raf,¤tSlot,2,&numberOfBytesWritten,NULL);
WriteFile(raf,&toWrite,2,&numberOfBytesWritten,NULL);
WriteFile(raf,&nextFileSlot,4,&numberOfBytesWritten,NULL);
WriteFile(raf,&lastFileSlot,4,&numberOfBytesWritten,NULL);
seekSlot(fileSlot);
WriteFile(raf,compressed.data+pos,toWrite,&numberOfBytesWritten,NULL);
if (remaining > 0)
{
lastFileSlot = fileSlot;
pos += toWrite;
currentSlot = -slot - 1;
}
}
delete[] compressed.data;
}
for (int c : *toReplace)
{
freeFileSlots.push_back(c);
seekSlotHeader(c);
short zero = 0;
WriteFile(raf,&zero,2,&numberOfBytesWritten,NULL);
}
toReplace->clear();
}
void NbtSlotFile::close()
{
CloseHandle(raf);
}
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