internal const long FBQE_HEADER_LENGTH = LAST_Q_POS + LAST_Q_LEN + 4; // 4-reserve
///////////////////////////////////////////////////
///////////////////// METHODS /////////////////////
///////////////////////////////////////////////////
/// <summary>
/// Get by index
/// </summary>
/// <param name="idx"></param>
/// <returns></returns>
public FBQE GetFBQE(int idx)
{
FBQE f = new FBQE();
f.index = idx;
f.address = idx * FBQE_LENGTH;
f.SG = VSLib.ConvertByteToString(VSLib.GetByteArray(buffer, f.address + SG_POS, SG_LEN));
f.ADDRESS_START = VSLib.ConvertByteToLong(VSLib.GetByteArray(buffer, f.address + ADDRESS_START_POS, ADDRESS_START_LEN));
f.ADDRESS_END = VSLib.ConvertByteToLong(VSLib.GetByteArray(buffer, f.address + ADDRESS_END_POS, ADDRESS_END_LEN));
f.LENGTH = VSLib.ConvertByteToLong(VSLib.GetByteArray(buffer, f.address + LENGTH_POS, LENGTH_LEN));
f.PREV = VSLib.ConvertByteToInt(VSLib.GetByteArray(buffer, f.address + PREV_POS, PREV_LEN));
f.NEXT = VSLib.ConvertByteToInt(VSLib.GetByteArray(buffer, f.address + NEXT_POS, NEXT_LEN));
if (f.SG != DEFS.FBQE_SIGNATURE)
{
throw new VSException(DEFS.E0006_INVALID_SIGNATURE_CODE, "(FBQE)");
}
return(f);
}
/// <summary>
/// Read int
/// </summary>
/// <param name="address"></param>
/// <returns></returns>
public int ReadInt(long address)
{
return(VSLib.ConvertByteToInt(ReadBytes(address, 4)));
}
public VSFreeSpaceManager(VSpace _sp)
{
Space = _sp;
vm = Space.VM;
long hdr_address = Space.GetFirstAddress(DEFS.POOL_FREE_SPACE);
if (hdr_address == 0)
{ // Initialization
// 1. Create H-block (header)
H_Object = new VSAllocation(vm, DEFS.FBQE_HEADER_ADDRESS, DEFS.FBQE_HEADER_LENGTH_FULL, 0);
H_Object.Write(0, DEFS.FBQE_HEADER_SIGNATURE);
this.MAX = DEFS.FBQE_ALLOCATION_NUMBER; // Max number of FBQE
this.FREE = MAX;
this.FIRST = -1;
this.LAST = -1;
this.FIRST_Q = 0;
this.LAST_Q = FREE - 1;
// 2. Save H-block address (1st object)
Space.SetFirstAddress(DEFS.POOL_FREE_SPACE, H_Object.DescriptorAddress); // 1st object
// 3. Create 1st FBQE block
F_Object = new VSAllocation(vm, H_Object.DescriptorAddress + H_Object.FullLength, (DEFS.FBQE_ALLOCATION_LENGTH + DEFS.BaseDescriptorLength), 0);
// 4. Set initial size
F_Object.SetSize(DEFS.FBQE_ALLOCATION_LENGTH);
buffer = new byte[F_Object.Size]; // Create buffer
// 5. Set references
F_Object.PREV = H_Object.DescriptorAddress;
H_Object.NEXT = F_Object.DescriptorAddress; // Address of the 1st block F-block
// 6. Save F-block address (last object)
Space.SetLastAddress(DEFS.POOL_FREE_SPACE, F_Object.DescriptorAddress); //last object
// 1.3 Initiate Free queue
for (int i = 0; i < FREE; i++)
{
CreateFBQE(i);
}
BuildBTrees();
// 1.4 Create initial FBQE
long fa = F_Object.DescriptorAddress + F_Object.FullLength; // 1st free address
AddFBQE(fa, (Space.vm.Size - fa), -1, -1); // Create 1st FBQE
}
else
{
H_Object = Space.GetAllocationByDescriptor(hdr_address);
F_Object = Space.GetAllocationByDescriptor(H_Object.NEXT);
byte[] b = H_Object.ReadBytes(0, FBQE_HEADER_LENGTH);
this.v_MAX = VSLib.ConvertByteToInt(VSLib.GetByteArray(b, MAX_POS, MAX_LEN));
this.v_FREE = VSLib.ConvertByteToInt(VSLib.GetByteArray(b, FREE_POS, FREE_LEN));
this.v_FIRST = VSLib.ConvertByteToInt(VSLib.GetByteArray(b, FIRST_POS, FIRST_LEN));
this.v_LAST = VSLib.ConvertByteToInt(VSLib.GetByteArray(b, LAST_POS, LAST_LEN));
this.v_FIRST_Q = VSLib.ConvertByteToInt(VSLib.GetByteArray(b, FIRST_Q_POS, FIRST_Q_LEN));
this.v_LAST_Q = VSLib.ConvertByteToInt(VSLib.GetByteArray(b, LAST_Q_POS, LAST_Q_LEN));
buffer = F_Object.ReadBytes(0, F_Object.Size); // Read buffer
BuildBTrees();
}
}
/// <summary>
/// Load cahce fields
/// </summary>
private void deserialize()
{
CURRENT_ALLOC = base.ALLOC;
// Create/cleanup fields cache
if (FCache == null)
{
FCache = new List <FieldCache>(32);
}
else
{
FCache.Clear();
}
// Create cache binary tree
FCacheTree = new VSBBTree(FCT_NAME, 32, true);
// Read variable data into the buffer
byte[] data = base.ReadBytes(base.FIXED, (long)FIELDS_SIZE);
int offset = FIRST_FIELD_OFFSET_REL; // Offset inside buffer (relative, doesn't include fixed part)
int n = (int)FIELDS_NUMBER; // Number of fields
// Load fields
for (int i = 0; i < n; i++)
{
// Create field
FieldCache f = new FieldCache();
f.OFFSET = offset; // Field offset in object
f.TYPE = data[offset + FIELD_TYPE_POS]; // Field type
byte name_length = data[offset + FIELD_NAME_LENGTH_POS]; // Name length
f.NAME = VSLib.ConvertByteToString(VSLib.GetByteArray(data, (int)(offset + FIELD_NAME_POS), (int)name_length)); // Name
int value_offset = FIELD_FIXED_LENGTH + name_length; // Value offset
// Get value depending on type
if ((f.TYPE == FIELD_TYPE_BYTE) | (f.TYPE == FIELD_TYPE_SHORT) | (f.TYPE == FIELD_TYPE_DATETIME))
{
f.DATA_OFFSET = value_offset; // Shift to value offset
f.LENGTH = FIELD_LENGTHS[f.TYPE];
}
else if ((f.TYPE == FIELD_TYPE_INT) | (f.TYPE == FIELD_TYPE_LONG))
{
f.DATA_OFFSET = value_offset + 1; // Shift to value offset (+ 1 byte length)
f.LENGTH = (int)data[offset + value_offset];
}
else if ((f.TYPE == FIELD_TYPE_BYTES) | (f.TYPE == FIELD_TYPE_STRING))
{
int l = (int)data[offset + value_offset]; // Read number of length bytes
if (l > 0)
{
byte[] ba = VSLib.GetByteArray(data, (int)(offset + value_offset + 1), (int)l); // Read length
f.LENGTH = VSLib.ConvertByteToInt(decompress(ba, FIELD_TYPE_LONG));
}
else
{
f.LENGTH = 0;
}
f.DATA_OFFSET = value_offset + 1 + l;
}
else
{
throw new VSException(DEFS.E0029_INVALID_FIELD_TYPE_CODE, "- " + f.TYPE.ToString());
}
f.OLDLENGTH = f.LENGTH;
f.STATE = STATE_LOADED;
f.FULL_LENGTH = f.DATA_OFFSET + f.LENGTH;
if (f.LENGTH > 0)
{
f.VALUE = VSLib.GetByteArray(data, (int)(offset + f.DATA_OFFSET), (int)f.LENGTH);
}
else
{
f.VALUE = new byte[0];
}
offset += f.FULL_LENGTH;
f.DELETED = false;
// Add to cache
FCache.Add(f);
// Add to the tree
FCacheTree.Insert(f.NAME, i);
}
FreeSpace = (int)(this.Size - base.FIXED - offset);
}
/// <summary>
/// Get int value
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public int GetInt(string name)
{
byte[] b = get_field(name, FIELD_TYPE_INT);
return((b == null) ? DEFAULT_INT : VSLib.ConvertByteToInt(b));
}
/// <summary>
/// Read int
/// </summary>
/// <returns></returns>
public int ReadInt(long offset = -1)
{
return(VSLib.ConvertByteToInt(this.ReadBytes(offset, 4)));
}