// Reserves an oid so it can't be used later.
public void Reserve(long oid)
{
// Add a empty block for the reserved data.
GObjectBlock reservedBlock = new GObjectBlock();
reservedBlock.Blocks = new long[]{};
reservedBlock.OID = oid;
reservedBlock.CountBytes = 0;
m_objectBlocks.Add(oid, reservedBlock);
m_lastOID = Math.Max(oid, m_lastOID);
}
// (05.04.2007 10:19)
// Saves oid internally in the file.
public void SaveOIDs()
{
lock (m_dummy)
{
m_oidPos = 0;
m_oidPosIndex = 0;
if (SaveChanges != null)
SaveChanges(this, new EventArgs());
// Free the blocks of the structure, but
// do not allow use of root block.
Delete(0);
m_deletedPos.RemoveAt(0);
// (02.07.2007 09:01)
// Remove all deleted blocks at the end of file.
long lastPos = LastDataBlockPos();
int c = this.m_deletedPos.Count;
long deletedpos;
for (int k = c - 1; k >= 0; k--)
{
deletedpos = (long)this.m_deletedPos.GetByIndex(k);
if (deletedpos > lastPos)
this.m_deletedPos.Remove(deletedpos);
else
break;
}
// (01.07.2007 13:43)
// Set the length to be shortest as possible.
this.m_stream.SetLength(lastPos + BLOCK_SIZE);
// Make sure the file length ends at a block.
long rest = m_stream.Length % BLOCK_SIZE;
if (rest != 0)
this.m_stream.SetLength(m_stream.Length + BLOCK_SIZE - m_stream.Length % BLOCK_SIZE);
m_stream.Seek(0, System.IO.SeekOrigin.Begin);
BinaryWriter w = new BinaryWriter(m_stream);
// Repair the delete index if a block is in use
// but marked as deleted.
ICollection oids = m_objectBlocks.Values;
foreach (GObjectBlock objectBlock in oids)
{
foreach (long pos in objectBlock.Blocks)
{
if (m_deletedPos.Contains(pos))
m_deletedPos.Remove(pos);
}
}
ArrayList oidBlocks = new ArrayList();
oidBlocks.Add(0L);
// Write number of object blocks.
WriteOIDInt32(m_objectBlocks.Count, w, oidBlocks);
int i = 0;
foreach (GObjectBlock objectBlock in oids)
{
if (objectBlock.OID != 0)
{
/*
// Stop if invalid object block.
System.Diagnostics.Debug.Assert(objectBlock.OID != -1, "Invalid Object Block", "The OID of this Object Block is not set.");
// Stop if the number of bytes is not correct.
System.Diagnostics.Debug.Assert(objectBlock.CountBytes <= objectBlock.Blocks.Length * BLOCK_SIZE && objectBlock.CountBytes >= (objectBlock.Blocks.Length - 1) * BLOCK_SIZE, "Invalid object size", "The size of object in bytes is larger than\n the number of blocks multiplied the block size");
*/
WriteOIDInt64(objectBlock.OID, w, oidBlocks);
WriteOIDInt32(objectBlock.CountBytes, w, oidBlocks);
// Write block positions.
WriteOIDInt32(objectBlock.Blocks.Length, w, oidBlocks);
int j = 0;
foreach (long pos in objectBlock.Blocks)
{
/*
// Stop if invalid block pos.
System.Diagnostics.Debug.Assert(pos - m_stream.Length <= BLOCK_SIZE * 4194304, "Invalid Block Position", "The block position was invalid because it points to a position 1 GB after the end of file.");
*/
WriteOIDInt64(pos, w, oidBlocks);
j++;
}
i++;
}
}
// Write number of deleted object blocks.
WriteOIDInt32(this.m_deletedPos.Count, w, oidBlocks);
ICollection positions = m_deletedPos.Values;
long[] positionsTable = new long[positions.Count];
positions.CopyTo(positionsTable, 0);
foreach (long pos in positionsTable)
{
WriteOIDInt64(pos, w, oidBlocks);
}
GObjectBlock oidBlock = new GObjectBlock();
oidBlock.Blocks = new long[oidBlocks.Count];
oidBlocks.CopyTo(oidBlock.Blocks, 0);
oidBlock.OID = 0L;
oidBlock.CountBytes = oidBlock.Blocks.Length * BLOCK_SIZE;
m_objectBlocks.Add(oidBlock.OID, oidBlock);
}
}
// (05.04.2007 10:19)
// Reads oids internally in the file.
public void ReadOIDs()
{
m_oidPos = 0;
// Make sure the file length ends at a block.
long rest = m_stream.Length % BLOCK_SIZE;
if (rest != 0)
this.m_stream.SetLength(m_stream.Length + BLOCK_SIZE - m_stream.Length % BLOCK_SIZE);
this.m_stream.Seek(0, System.IO.SeekOrigin.Begin);
this.m_objectBlocks.Clear();
this.m_deletedPos.Clear();
GObjectBlock oidBlock = new GObjectBlock();
if (m_stream.Length == 0)
{
oidBlock.OID = 0L;
oidBlock.CountBytes = BLOCK_SIZE;
oidBlock.Blocks = new long[]{0};
m_objectBlocks.Add(0L, oidBlock);
return;
}
BinaryReader r = new BinaryReader(m_stream);
ArrayList oidBlocks = new ArrayList();
oidBlocks.Add(0L);
int countObjectBlocks = ReadOIDInt32(r, oidBlocks);
long readPos = 0;
for (int i = 0; i < countObjectBlocks; i++)
{
GObjectBlock objectBlock = new GObjectBlock();
objectBlock.OID = ReadOIDInt64(r, oidBlocks);
if (objectBlock.OID != 0)
{
if (objectBlock.OID > m_lastOID)
m_lastOID = objectBlock.OID;
objectBlock.CountBytes = ReadOIDInt32(r, oidBlocks);
// Read block positions.
int blockCount = ReadOIDInt32(r, oidBlocks);
// Stop if the number of bytes is not correct.
System.Diagnostics.Debug.Assert(objectBlock.CountBytes <= blockCount * BLOCK_SIZE && objectBlock.CountBytes >= (blockCount - 1) * BLOCK_SIZE, "Invalid object size", "The size of object in bytes is larger than\n the number of blocks multiplied the block size");
objectBlock.Blocks = new long[blockCount];
for (int j = 0; j < blockCount; j++)
{
readPos = ReadOIDInt64(r, oidBlocks);
// Repear delete index if the block is used.
if (this.m_deletedPos.Contains(readPos))
this.m_deletedPos.Remove(readPos);
objectBlock.Blocks[j] = readPos;
}
// Add object block.
m_objectBlocks.Add(objectBlock.OID, objectBlock);
}
}
// Read deleted block positions.
int deletedBlocks = ReadOIDInt32(r, oidBlocks);
for (int i = 0; i < deletedBlocks; i++)
{
long pos = ReadOIDInt64(r, oidBlocks);
if (!m_deletedPos.Contains(pos))
m_deletedPos.Add(pos, pos);
}
oidBlock.Blocks = new long[oidBlocks.Count];
oidBlocks.CopyTo(oidBlock.Blocks, 0);
oidBlock.OID = 0L;
oidBlock.CountBytes = oidBlock.Blocks.Length * BLOCK_SIZE;
m_objectBlocks.Add(oidBlock.OID, oidBlock);
}
// Create an empty object block,
// prepared for stream writing.
public GObjectBlock GetEmptyBlock(long oid)
{
GObjectBlock objectBlock = new GObjectBlock();
objectBlock.OID = oid;
objectBlock.CountBytes = 0;
objectBlock.Blocks = new long[]{};
this.m_objectBlocks.Add(oid, objectBlock);
return objectBlock;
}
public OdbStream(GODB odb, long oid)
{
m_odb = odb;
if (!m_odb.ReadOnly && !m_odb.Contains(oid))
m_objectBlock = m_odb.GetEmptyBlock(oid);
else
m_objectBlock = m_odb.GetObjectBlock(oid);
}
private void ReserveOID(int bytesLength)
{
long oid = 0L;
// Write block on new position.
GObjectBlock objectBlock = new GObjectBlock();
objectBlock.OID = oid;
objectBlock.CountBytes = bytesLength;
// Delete old object block.
Delete(oid);
// Compute the number of blocks needed.
int countBlocks = (int)Math.Ceiling(objectBlock.CountBytes / (double)BLOCK_SIZE);
objectBlock.Blocks = this.FindNewOIDPos(countBlocks);
// Add new object block.
m_objectBlocks.Add(oid, objectBlock);
if (oid > m_lastOID)
m_lastOID = oid;
}
/// <summary>
/// Saves bytes.
/// If the OID writed has larger value than
/// the automatically created OID, the next
/// generated OID will follow the writed OID.
/// </summary>
/// <param name="oid">The OID (object identifier).</param>
/// <param name="bytes">The bytes to write.</param>
public void Write(long oid, byte[] bytes)
{
lock (m_dummy)
{
// Write block on new position.
GObjectBlock objectBlock = new GObjectBlock();
objectBlock.OID = oid;
objectBlock.CountBytes = bytes.Length;
// Delete old object block.
Delete(oid);
// Compute the number of blocks needed.
int countBlocks = (int)Math.Ceiling(objectBlock.CountBytes / (double)BLOCK_SIZE);
objectBlock.Blocks = this.FindNewPos(countBlocks);
for (long i = 0; i < countBlocks; i++)
{
long pos = i * BLOCK_SIZE;
m_stream.Seek(objectBlock.Blocks[i], System.IO.SeekOrigin.Begin);
m_stream.Write(bytes, (int)pos, (int)(Math.Min(BLOCK_SIZE, bytes.Length - pos)));
}
// Add new object block.
m_objectBlocks.Add(oid, objectBlock);
if (oid > m_lastOID)
m_lastOID = oid;
}
}
