private int ReadBytes(byte[] buffer, int offset, int count, bool compute)
{
var t = 0;
do
{
var r = inner.Read(buffer, offset, count);
if (r == 0)
{
break;
}
if (compute)
{
for (var i = 0; i < r; i++)
{
crc32.Add(buffer[offset + i]);
}
}
count -= r;
t += r;
}while (count > 0);
return(t);
}
/// <summary>
/// Commits the provided transaction
/// </summary>
public void CommitTransaction(ref TransactionToken token)
{
AssertionFailedException.Assert(token.State == StateOpen);
token.State = StateCommitted;
MemoryStream buffer = token.Object as MemoryStream;
if (buffer == null)
{
return; // nothing to commit
}
byte[] bytes = buffer.GetBuffer();
Crc32 crc = new Crc32();
crc.Add(bytes, 4, (int)buffer.Position - 4);
PrimitiveSerializer.Int32.WriteTo(crc.Value, buffer);
int len = (int)buffer.Position;
PrimitiveSerializer.Int32.WriteTo((0xee << 24) + len, buffer);
buffer.Position = 0;
PrimitiveSerializer.Int32.WriteTo((0xbb << 24) + len, buffer);
bytes = buffer.GetBuffer();
WriteBytes(bytes, 0, len + 4);
}
public static long Get(byte[] data, int start, int length)
{
Crc32 crc32 = new Crc32();
crc32.Add(data, start, length);
return(crc32.Get());
}
public static long Get(byte[] data)
{
Crc32 crc32 = new Crc32();
crc32.Add(data);
return(crc32.Get());
}
public void TestAddByteRange()
{
Crc32 all = new Crc32(new byte[] { 0x2, 0x3, 0x4, 0x5, 0x6 });
Crc32 crc = new Crc32();
Assert.AreEqual(0, crc.Value);
crc.Add(new byte[] { 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8 }, 1, 5);
Assert.AreEqual(all.Value, crc.Value);
}
public void TestHashValue()
{
Crc32 crc = new Crc32();
Assert.AreEqual(0, crc.Value);
Assert.AreEqual(0, crc.GetHashCode());
crc.Add(0x1b);
Assert.AreNotEqual(0, crc.Value);
Assert.AreEqual(crc.Value, crc.GetHashCode());
}
private static void AssertCrc32(byte[] input, int expected)
{
Crc32 crc = new Crc32(input);
Assert.AreEqual(expected, crc.Value);
crc = new Crc32(0);
crc.Add(input);
Assert.AreEqual(expected, crc.Value);
crc = new Crc32();
crc.Add(input, 0, input.Length);
Assert.AreEqual(expected, crc.Value);
crc = new Crc32();
foreach (byte b in input)
crc.Add(b);
Assert.AreEqual(expected, crc.Value);
}
private static void AssertCrc32(byte[] input, int expected)
{
Crc32 crc = new Crc32(input);
Assert.AreEqual(expected, crc.Value);
crc = new Crc32(0);
crc.Add(input);
Assert.AreEqual(expected, crc.Value);
crc = new Crc32();
crc.Add(input, 0, input.Length);
Assert.AreEqual(expected, crc.Value);
crc = new Crc32();
foreach (byte b in input)
{
crc.Add(b);
}
Assert.AreEqual(expected, crc.Value);
}
private void UpdateCache(Session s, BinaryReader r, DatFile.Mft mft, CustomEntry c)
{
using (var w = new BinaryWriter(r.BaseStream))
{
var entry = mft.entries[INDEX_ENTRIES];
//write the data
w.BaseStream.Position = mft.entries[c.index].offset;
var size = c.WriteTo(w.BaseStream, s.compressor);
if (size != c.entry.size)
{
//rewrite the size of the entry
w.BaseStream.Position = entry.offset + (c.index + 1) * 24 + 8;
w.Write(size);
//note that although the data for this entry has changed, the crc hasn't due to how it's calculated
//calculate the crc of the main entry
r.BaseStream.Position = entry.offset;
var buffer = r.ReadBytes(entry.size);
var crc32 = new Crc32();
for (var i = 0; i < buffer.Length; i++)
{
if (i < 72 || i >= 96) //skip 3rd entry
{
crc32.Add(buffer[i]);
}
}
//rewrite the crc
w.BaseStream.Position = entry.offset + (INDEX_ENTRIES + 1) * 24 + 20;
w.Write(crc32.CRC);
}
}
}
/// <summary>
/// Replay the log file from the position provided and output the new log position
/// </summary>
IEnumerable <LogEntry> EnumerateLog(long[] position)
{
lock (_logSync)
{
long pos = 0;
long length;
if (!File.Exists(_options.FileName))
{
position[0] = 0;
yield break;
}
using (MemoryStream buffer = new MemoryStream(8192))
using (Stream io = new FileStream(_options.FileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, 0x10000, FileOptions.SequentialScan))
{
bool valid = true;
const int minSize = 16;
byte[] bytes = buffer.GetBuffer();
int size, temp, nbytes, szcontent;
short opCount;
LogEntry entry = new LogEntry();
length = io.Length;
if (position[0] < 0 || position[0] > length)
{
position[0] = length;
yield break;
}
bool fixedOffset = position[0] > 0;
io.Position = position[0];
while (valid && (pos = position[0] = io.Position) + minSize < length)
{
try
{
size = PrimitiveSerializer.Int32.ReadFrom(io);
size = ((byte)(size >> 24) == 0xbb) ? size & 0x00FFFFFF : -1;
if (size < minSize || pos + size + 4 > length)
{
if (fixedOffset)
{
yield break;
}
break;
}
fixedOffset = false;
if (size > buffer.Capacity)
{
buffer.Capacity = (size + 8192);
bytes = buffer.GetBuffer();
}
szcontent = size - 8;
buffer.Position = 0;
buffer.SetLength(szcontent);
nbytes = 0;
while (nbytes < szcontent && (temp = io.Read(bytes, nbytes, szcontent - nbytes)) != 0)
{
nbytes += temp;
}
if (nbytes != szcontent)
{
break;
}
Crc32 crc = new Crc32();
crc.Add(bytes, 0, nbytes);
temp = PrimitiveSerializer.Int32.ReadFrom(io);
if (crc.Value != temp)
{
break;
}
temp = PrimitiveSerializer.Int32.ReadFrom(io);
if ((byte)(temp >> 24) != 0xee || (temp & 0x00FFFFFF) != size)
{
break;
}
entry.TransactionId = PrimitiveSerializer.Int32.ReadFrom(buffer);
_transactionId = Math.Max(_transactionId, entry.TransactionId + 1);
opCount = PrimitiveSerializer.Int16.ReadFrom(buffer);
if (opCount <= 0 || opCount >= short.MaxValue)
{
break;
}
}
catch (InvalidDataException)
{
break;
}
while (opCount-- > 0)
{
entry.OpCode = (OperationCode)PrimitiveSerializer.Int16.ReadFrom(buffer);
if (entry.OpCode != OperationCode.Add && entry.OpCode != OperationCode.Update && entry.OpCode != OperationCode.Remove)
{
valid = false;
break;
}
try
{
entry.Key = _options.KeySerializer.ReadFrom(buffer);
entry.Value = (entry.OpCode == OperationCode.Remove)
? default(TValue)
: _options.ValueSerializer.ReadFrom(buffer);
}
catch
{
valid = false;
break;
}
if ((buffer.Position == buffer.Length) != (opCount == 0))
{
valid = false;
break;
}
yield return(entry);
}
}
}
if (!_options.ReadOnly && pos < length)
{
TruncateLog(pos);
}
}
}
private bool UpdateCache(BinaryReader r, int build = 0)
{
var mft = DatFile.ReadMft(r);
var s = session;
CustomEntry c = null;
var counter = 2;
for (var i = mft.entries.Length - 1; i >= 0; --i)
{
var e = mft.entries[i];
switch (e.baseId)
{
case ID_CACHE:
c = new CustomEntry()
{
index = i,
entry = e,
};
if (--counter == 0)
{
i = 1;
}
break;
case ID_LOCAL:
if (build == 0)
{
build = ReadBuild(s.compressor, r.BaseStream, e);
}
if (--counter == 0)
{
i = 1;
}
break;
}
}
if (build > 0)
{
if (c == null)
{
//entry will need to be created, which will require updating the entries and ids
var blockSize = mft.BlockSize;
var ofs = 0L;
DatFile.MftEntry entry;
c = new CustomEntry()
{
index = mft.entries.Length,
};
//find the next position to write data (not considering free space)
for (var i = mft.entries.Length - 1; i >= 0; --i)
{
var e = mft.entries[i];
var l = e.offset + e.size;
if (l > ofs)
{
ofs = l;
}
}
ofs = (ofs / blockSize + 1) * blockSize;
using (var w = new BinaryWriter(r.BaseStream, Encoding.ASCII, true))
{
var crc32 = new Crc32();
byte[] buffer;
entry = mft.entries[INDEX_IDS];
if (!HasFreeSpace(entry, blockSize, 8))
{
r.BaseStream.Position = entry.offset;
buffer = r.ReadBytes(entry.size);
w.BaseStream.Position = ofs;
w.Write(buffer);
entry.offset = ofs;
ofs += ((entry.size + 8) / blockSize + 1) * blockSize;
}
//adding id
w.BaseStream.Position = entry.offset + entry.size;
w.Write(ID_CACHE);
w.Write(c.index + 1);
entry.size += 8;
//update size
w.BaseStream.Position = mft.entries[INDEX_ENTRIES].offset + (INDEX_IDS + 1) * 24;
w.Write(entry.offset);
w.Write(entry.size);
//recalculate crc
r.BaseStream.Position = entry.offset;
buffer = r.ReadBytes(entry.size);
foreach (var b in buffer)
{
crc32.Add(b);
}
//update crc
w.BaseStream.Position = mft.entries[INDEX_ENTRIES].offset + (INDEX_IDS + 1) * 24 + 20;
w.Write(crc32.CRC);
crc32.Reset();
entry = mft.entries[INDEX_ENTRIES];
if (!HasFreeSpace(entry, blockSize, 24))
{
r.BaseStream.Position = entry.offset;
buffer = r.ReadBytes(entry.size);
w.BaseStream.Position = ofs;
w.Write(buffer);
entry.offset = ofs;
ofs += ((entry.size + 24) / blockSize + 1) * blockSize;
}
c.entry = new DatFile.MftEntry()
{
compression = 8,
baseId = ID_CACHE,
fileId = ID_CACHE,
crc = 1214729159,
flags = 3,
offset = ofs,
};
c.data = CreateGw2Cache(s.compressor, build, c.entry.compression == 8);
c.length = c.data.Length;
var entries = new DatFile.MftEntry[c.index + 1];
Array.Copy(mft.entries, entries, mft.entries.Length);
entries[c.index] = c.entry;
mft.entries = entries;
//adding entry
w.BaseStream.Position = entry.offset + entry.size;
WriteEntry(w, c.entry);
entry.size += 24;
//update count
w.BaseStream.Position = entry.offset + 12;
w.Write(entries.Length + 1);
//update size
w.BaseStream.Position = entry.offset + (INDEX_ENTRIES + 1) * 24;
w.Write(entry.offset);
w.Write(entry.size);
//entries crc is updated when writing data
//update header
w.BaseStream.Position = 24;
w.Write(entry.offset);
w.Write(entry.size);
}
}
else
{
c.data = CreateGw2Cache(s.compressor, build, c.entry.compression == 8);
c.length = c.data.Length;
}
UpdateCache(s, r, mft, c);
return(true);
}
return(false);
}
public BlockStreamReader(FragmentedFile file, long ordinal, BlockFlags typeExpected, bool validated)
{
_file = file;
_blockPos = 0;
_validated = validated;
_block = new FileBlock(file._blockSize, file._useAlignedIo);
_file.ReadBlock(ordinal, _block, file._blockSize, typeExpected, _validated);
if (_validated)
{
_expectedSum = _block.CheckSum;
_checksum = new Crc32();
_checksum.Add(_block.BlockData, _block.DataOffset, _block.Length);
if (_block.NextBlockId == 0 && _checksum != _expectedSum)
throw new InvalidDataException();
}
}
public void TestAddByteRange()
{
Crc32 all = new Crc32(new byte[] { 0x2, 0x3, 0x4, 0x5, 0x6 });
Crc32 crc = new Crc32();
Assert.AreEqual(0, crc.Value);
crc.Add(new byte[] { 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8 }, 1, 5);
Assert.AreEqual(all.Value, crc.Value);
}
public void TestHashValue()
{
Crc32 crc = new Crc32();
Assert.AreEqual(0, crc.Value);
Assert.AreEqual(0, crc.GetHashCode());
crc.Add(0x1b);
Assert.AreNotEqual(0, crc.Value);
Assert.AreEqual(crc.Value, crc.GetHashCode());
}
