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MCADefrag: Initial implementation.

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Partially implements #639.
This only defragments the chunks, without recompressing them.
This commit is contained in:
madmaxoft
2014-02-13 11:47:20 +01:00
parent cc72b656c9
commit 05590fb91d
6 changed files with 799 additions and 0 deletions
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303
Tools/MCADefrag/MCADefrag.cpp Normal file
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// MCADefrag.cpp
// Implements the main app entrypoint and the cMCADefrag class representing the entire app
#include "Globals.h"
#include "MCADefrag.h"
#include "MCLogger.h"
int main(int argc, char ** argv)
{
new cMCLogger(Printf("Defrag_%08x.log", time(NULL)));
cMCADefrag Defrag;
if (!Defrag.Init(argc, argv))
{
return 1;
}
Defrag.Run();
return 0;
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// cMCADefrag:
cMCADefrag::cMCADefrag(void) :
m_NumThreads(1)
{
}
bool cMCADefrag::Init(int argc, char ** argv)
{
// Nothing needed yet
return true;
}
void cMCADefrag::Run(void)
{
// Fill the queue with MCA files
m_Queue = cFile::GetFolderContents(".");
// Start the processing threads:
for (int i = 0; i < m_NumThreads; i++)
{
StartThread();
}
// Wait for all the threads to finish:
while (!m_Threads.empty())
{
m_Threads.front()->Wait();
delete m_Threads.front();
m_Threads.pop_front();
}
}
void cMCADefrag::StartThread(void)
{
cThread * Thread = new cThread(*this);
m_Threads.push_back(Thread);
Thread->Start();
}
AString cMCADefrag::GetNextFileName(void)
{
cCSLock Lock(m_CS);
if (m_Queue.empty())
{
return AString();
}
AString res = m_Queue.back();
m_Queue.pop_back();
return res;
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// cMCADefrag::cThread:
cMCADefrag::cThread::cThread(cMCADefrag & a_Parent) :
super("MCADefrag thread"),
m_Parent(a_Parent)
{
}
void cMCADefrag::cThread::Execute(void)
{
for (;;)
{
AString FileName = m_Parent.GetNextFileName();
if (FileName.empty())
{
return;
}
ProcessFile(FileName);
}
}
void cMCADefrag::cThread::ProcessFile(const AString & a_FileName)
{
// Filter out non-MCA files:
if ((a_FileName.length() < 4) || (a_FileName.substr(a_FileName.length() - 4, 4) != ".mca"))
{
return;
}
LOGINFO("%s", a_FileName.c_str());
// Open input and output files:
AString OutFileName = a_FileName + ".new";
cFile In, Out;
if (!In.Open(a_FileName, cFile::fmRead))
{
LOGWARNING("Cannot open file %s for reading, skipping file.", a_FileName.c_str());
return;
}
if (!Out.Open(OutFileName.c_str(), cFile::fmWrite))
{
LOGWARNING("Cannot open file %s for writing, skipping file.", OutFileName.c_str());
return;
}
// Read the Locations and Timestamps from the input file:
Byte Locations[4096];
UInt32 Timestamps[1024];
if (In.Read(Locations, sizeof(Locations)) != sizeof(Locations))
{
LOGWARNING("Cannot read Locations in file %s, skipping file.", a_FileName.c_str());
return;
}
if (In.Read(Timestamps, sizeof(Timestamps)) != sizeof(Timestamps))
{
LOGWARNING("Cannot read Timestamps in file %s, skipping file.", a_FileName.c_str());
return;
}
// Write dummy Locations to the Out file (will be overwritten once the correct ones are known)
if (Out.Write(Locations, sizeof(Locations)) != sizeof(Locations))
{
LOGWARNING("Cannot write Locations to file %s, skipping file.", OutFileName.c_str());
return;
}
m_CurrentSectorOut = 2;
// Write a copy of the Timestamps into the Out file:
if (Out.Write(Timestamps, sizeof(Timestamps)) != sizeof(Timestamps))
{
LOGWARNING("Cannot write Timestamps to file %s, skipping file.", OutFileName.c_str());
return;
}
// Process each chunk:
for (size_t i = 0; i < 1024; i++)
{
size_t idx = i * 4;
if (
(Locations[idx] == 0) &&
(Locations[idx + 1] == 0) &&
(Locations[idx + 2] == 0) &&
(Locations[idx + 3] == 0)
)
{
// Chunk not present
continue;
}
if (!ReadChunk(In, Locations + idx))
{
LOGWARNING("Cannot read chunk #%d from file %s. Skipping file.", i, a_FileName.c_str());
return;
}
if (!WriteChunk(Out, Locations + idx))
{
LOGWARNING("Cannot write chunk #%d to file %s. Skipping file.", i, OutFileName.c_str());
return;
}
}
// Write the new Locations into the MCA header:
Out.Seek(0);
if (Out.Write(Locations, sizeof(Locations)) != sizeof(Locations))
{
LOGWARNING("Cannot write updated Locations to file %s, skipping file.", OutFileName.c_str());
return;
}
// Close the files, delete orig, rename new:
In.Close();
Out.Close();
cFile::Delete(a_FileName);
cFile::Rename(OutFileName, a_FileName);
}
bool cMCADefrag::cThread::ReadChunk(cFile & a_File, const Byte * a_LocationRaw)
{
int SectorNum = (a_LocationRaw[0] << 16) | (a_LocationRaw[1] << 8) | a_LocationRaw[2];
int SizeInSectors = a_LocationRaw[3] * (4 KiB);
if (a_File.Seek(SectorNum * (4 KiB)) < 0)
{
LOGWARNING("Failed to seek to chunk data - file pos %llu (%d KiB, %.02f MiB)!", (Int64)SectorNum * (4 KiB), SectorNum * 4, ((double)SectorNum) / 256);
return false;
}
// Read the exact size:
Byte Buf[4];
if (a_File.Read(Buf, 4) != 4)
{
LOGWARNING("Failed to read chunk data length");
return false;
}
m_CompressedChunkDataSize = (Buf[0] << 24) | (Buf[1] << 16) | (Buf[2] << 8) | Buf[3];
if (m_CompressedChunkDataSize > SizeInSectors)
{
LOGWARNING("Invalid chunk data - SizeInSectors (%d) smaller that RealSize (%d)", SizeInSectors, m_CompressedChunkDataSize);
return false;
}
// Read the data:
if (a_File.Read(m_CompressedChunkData, m_CompressedChunkDataSize) != m_CompressedChunkDataSize)
{
LOGWARNING("Failed to read chunk data!");
return false;
}
// TODO: Uncompress the data if recompression is active
return true;
}
bool cMCADefrag::cThread::WriteChunk(cFile & a_File, Byte * a_LocationRaw)
{
// TODO: Recompress the data if recompression is active
a_LocationRaw[0] = m_CurrentSectorOut >> 16;
a_LocationRaw[1] = (m_CurrentSectorOut >> 8) & 0xff;
a_LocationRaw[2] = m_CurrentSectorOut & 0xff;
a_LocationRaw[3] = (m_CompressedChunkDataSize + (4 KiB) - 1) / (4 KiB);
// Write the data length:
Byte Buf[4];
Buf[0] = m_CompressedChunkDataSize >> 24;
Buf[1] = (m_CompressedChunkDataSize >> 16) & 0xff;
Buf[2] = (m_CompressedChunkDataSize >> 8) & 0xff;
Buf[3] = m_CompressedChunkDataSize & 0xff;
if (a_File.Write(Buf, 4) != 4)
{
LOGWARNING("Failed to write chunk length!");
return false;
}
// Write the data:
if (a_File.Write(m_CompressedChunkData, m_CompressedChunkDataSize) != m_CompressedChunkDataSize)
{
LOGWARNING("Failed to write chunk data!");
return false;
}
return true;
}