public override SQLiteErrorCode BestIndex(SQLiteVirtualTable table, SQLiteIndex index)
{
this.CheckDisposed();
if (table.BestIndex(index))
{
return(SQLiteErrorCode.Ok);
}
CultureInfo currentCulture = CultureInfo.CurrentCulture;
object[] tableName = new object[] { table.TableName };
this.SetTableError(table, HelperMethods.StringFormat(currentCulture, "failed to select best index for virtual table \"{0}\"", tableName));
return(SQLiteErrorCode.Error);
}
private static IntPtr AllocateAndInitializeNative(int nConstraint, int nOrderBy)
{
int num;
int num1;
int num2;
int num3;
IntPtr zero = IntPtr.Zero;
IntPtr intPtr = IntPtr.Zero;
IntPtr zero1 = IntPtr.Zero;
IntPtr intPtr1 = IntPtr.Zero;
IntPtr zero2 = IntPtr.Zero;
try
{
SQLiteIndex.SizeOfNative(out num, out num2, out num1, out num3);
if (num > 0 && num2 > 0 && num1 > 0 && num3 > 0)
{
intPtr = SQLiteMemory.Allocate(num);
zero1 = SQLiteMemory.Allocate(num2 * nConstraint);
intPtr1 = SQLiteMemory.Allocate(num1 * nOrderBy);
zero2 = SQLiteMemory.Allocate(num3 * nConstraint);
if (intPtr != IntPtr.Zero && zero1 != IntPtr.Zero && intPtr1 != IntPtr.Zero && zero2 != IntPtr.Zero)
{
int num4 = 0;
SQLiteMarshal.WriteInt32(intPtr, num4, nConstraint);
num4 = SQLiteMarshal.NextOffsetOf(num4, 4, IntPtr.Size);
SQLiteMarshal.WriteIntPtr(intPtr, num4, zero1);
num4 = SQLiteMarshal.NextOffsetOf(num4, IntPtr.Size, 4);
SQLiteMarshal.WriteInt32(intPtr, num4, nOrderBy);
num4 = SQLiteMarshal.NextOffsetOf(num4, 4, IntPtr.Size);
SQLiteMarshal.WriteIntPtr(intPtr, num4, intPtr1);
num4 = SQLiteMarshal.NextOffsetOf(num4, IntPtr.Size, IntPtr.Size);
SQLiteMarshal.WriteIntPtr(intPtr, num4, zero2);
zero = intPtr;
}
}
}
finally
{
if (zero == IntPtr.Zero)
{
if (zero2 != IntPtr.Zero)
{
SQLiteMemory.Free(zero2);
zero2 = IntPtr.Zero;
}
if (intPtr1 != IntPtr.Zero)
{
SQLiteMemory.Free(intPtr1);
intPtr1 = IntPtr.Zero;
}
if (zero1 != IntPtr.Zero)
{
SQLiteMemory.Free(zero1);
zero1 = IntPtr.Zero;
}
if (intPtr != IntPtr.Zero)
{
SQLiteMemory.Free(intPtr);
intPtr = IntPtr.Zero;
}
}
}
return(zero);
}
internal static void ToIntPtr(SQLiteIndex index, IntPtr pIndex, bool includeInput)
{
if (index == null)
{
return;
}
SQLiteIndexOutputs outputs = index.Outputs;
if (outputs == null)
{
return;
}
SQLiteIndexConstraintUsage[] constraintUsages = outputs.ConstraintUsages;
if (constraintUsages == null)
{
return;
}
SQLiteIndexInputs inputs = null;
SQLiteIndexConstraint[] constraints = null;
SQLiteIndexOrderBy[] orderBys = null;
if (includeInput)
{
inputs = index.Inputs;
if (inputs == null)
{
return;
}
constraints = inputs.Constraints;
if (constraints == null)
{
return;
}
orderBys = inputs.OrderBys;
if (orderBys == null)
{
return;
}
}
if (pIndex == IntPtr.Zero)
{
return;
}
int num = 0;
int num1 = SQLiteMarshal.ReadInt32(pIndex, num);
if (includeInput && num1 != (int)constraints.Length)
{
return;
}
if (num1 != (int)constraintUsages.Length)
{
return;
}
num = SQLiteMarshal.NextOffsetOf(num, 4, IntPtr.Size);
if (includeInput)
{
IntPtr intPtr = SQLiteMarshal.ReadIntPtr(pIndex, num);
int num2 = Marshal.SizeOf(typeof(UnsafeNativeMethods.sqlite3_index_constraint));
for (int i = 0; i < num1; i++)
{
UnsafeNativeMethods.sqlite3_index_constraint sqlite3IndexConstraint = new UnsafeNativeMethods.sqlite3_index_constraint(constraints[i]);
Marshal.StructureToPtr(sqlite3IndexConstraint, SQLiteMarshal.IntPtrForOffset(intPtr, i * num2), false);
}
}
num = SQLiteMarshal.NextOffsetOf(num, IntPtr.Size, 4);
int num3 = (includeInput ? SQLiteMarshal.ReadInt32(pIndex, num) : 0);
if (includeInput && num3 != (int)orderBys.Length)
{
return;
}
num = SQLiteMarshal.NextOffsetOf(num, 4, IntPtr.Size);
if (includeInput)
{
IntPtr intPtr1 = SQLiteMarshal.ReadIntPtr(pIndex, num);
int num4 = Marshal.SizeOf(typeof(UnsafeNativeMethods.sqlite3_index_orderby));
for (int j = 0; j < num3; j++)
{
UnsafeNativeMethods.sqlite3_index_orderby sqlite3IndexOrderby = new UnsafeNativeMethods.sqlite3_index_orderby(orderBys[j]);
Marshal.StructureToPtr(sqlite3IndexOrderby, SQLiteMarshal.IntPtrForOffset(intPtr1, j * num4), false);
}
}
num = SQLiteMarshal.NextOffsetOf(num, IntPtr.Size, IntPtr.Size);
IntPtr intPtr2 = SQLiteMarshal.ReadIntPtr(pIndex, num);
int num5 = Marshal.SizeOf(typeof(UnsafeNativeMethods.sqlite3_index_constraint_usage));
for (int k = 0; k < num1; k++)
{
UnsafeNativeMethods.sqlite3_index_constraint_usage sqlite3IndexConstraintUsage = new UnsafeNativeMethods.sqlite3_index_constraint_usage(constraintUsages[k]);
Marshal.StructureToPtr(sqlite3IndexConstraintUsage, SQLiteMarshal.IntPtrForOffset(intPtr2, k * num5), false);
}
num = SQLiteMarshal.NextOffsetOf(num, IntPtr.Size, 4);
SQLiteMarshal.WriteInt32(pIndex, num, outputs.IndexNumber);
num = SQLiteMarshal.NextOffsetOf(num, 4, IntPtr.Size);
SQLiteMarshal.WriteIntPtr(pIndex, num, SQLiteString.Utf8IntPtrFromString(outputs.IndexString));
num = SQLiteMarshal.NextOffsetOf(num, IntPtr.Size, 4);
SQLiteMarshal.WriteInt32(pIndex, num, (outputs.NeedToFreeIndexString != 0 ? outputs.NeedToFreeIndexString : 1));
num = SQLiteMarshal.NextOffsetOf(num, 4, 4);
SQLiteMarshal.WriteInt32(pIndex, num, outputs.OrderByConsumed);
num = SQLiteMarshal.NextOffsetOf(num, 4, 8);
if (outputs.EstimatedCost.HasValue)
{
SQLiteMarshal.WriteDouble(pIndex, num, outputs.EstimatedCost.GetValueOrDefault());
}
num = SQLiteMarshal.NextOffsetOf(num, 8, 8);
if (outputs.CanUseEstimatedRows() && outputs.EstimatedRows.HasValue)
{
SQLiteMarshal.WriteInt64(pIndex, num, outputs.EstimatedRows.GetValueOrDefault());
}
num = SQLiteMarshal.NextOffsetOf(num, 8, 4);
if (outputs.CanUseIndexFlags() && outputs.IndexFlags.HasValue)
{
SQLiteMarshal.WriteInt32(pIndex, num, (int)outputs.IndexFlags.GetValueOrDefault());
}
num = SQLiteMarshal.NextOffsetOf(num, 4, 8);
if (outputs.CanUseColumnsUsed() && outputs.ColumnsUsed.HasValue)
{
SQLiteMarshal.WriteInt64(pIndex, num, outputs.ColumnsUsed.GetValueOrDefault());
}
}
internal static void FromIntPtr(IntPtr pIndex, bool includeOutput, ref SQLiteIndex index)
{
if (pIndex == IntPtr.Zero)
{
return;
}
int num = 0;
int num1 = SQLiteMarshal.ReadInt32(pIndex, num);
num = SQLiteMarshal.NextOffsetOf(num, 4, IntPtr.Size);
IntPtr intPtr = SQLiteMarshal.ReadIntPtr(pIndex, num);
num = SQLiteMarshal.NextOffsetOf(num, IntPtr.Size, 4);
int num2 = SQLiteMarshal.ReadInt32(pIndex, num);
num = SQLiteMarshal.NextOffsetOf(num, 4, IntPtr.Size);
IntPtr intPtr1 = SQLiteMarshal.ReadIntPtr(pIndex, num);
IntPtr zero = IntPtr.Zero;
if (includeOutput)
{
num = SQLiteMarshal.NextOffsetOf(num, IntPtr.Size, IntPtr.Size);
zero = SQLiteMarshal.ReadIntPtr(pIndex, num);
}
index = new SQLiteIndex(num1, num2);
SQLiteIndexInputs inputs = index.Inputs;
if (inputs == null)
{
return;
}
SQLiteIndexConstraint[] constraints = inputs.Constraints;
if (constraints == null)
{
return;
}
SQLiteIndexOrderBy[] orderBys = inputs.OrderBys;
if (orderBys == null)
{
return;
}
Type type = typeof(UnsafeNativeMethods.sqlite3_index_constraint);
int num3 = Marshal.SizeOf(type);
for (int i = 0; i < num1; i++)
{
IntPtr intPtr2 = SQLiteMarshal.IntPtrForOffset(intPtr, i * num3);
UnsafeNativeMethods.sqlite3_index_constraint structure = (UnsafeNativeMethods.sqlite3_index_constraint)Marshal.PtrToStructure(intPtr2, type);
constraints[i] = new SQLiteIndexConstraint(structure);
}
Type type1 = typeof(UnsafeNativeMethods.sqlite3_index_orderby);
int num4 = Marshal.SizeOf(type1);
for (int j = 0; j < num2; j++)
{
IntPtr intPtr3 = SQLiteMarshal.IntPtrForOffset(intPtr1, j * num4);
UnsafeNativeMethods.sqlite3_index_orderby sqlite3IndexOrderby = (UnsafeNativeMethods.sqlite3_index_orderby)Marshal.PtrToStructure(intPtr3, type1);
orderBys[j] = new SQLiteIndexOrderBy(sqlite3IndexOrderby);
}
if (includeOutput)
{
SQLiteIndexOutputs outputs = index.Outputs;
if (outputs == null)
{
return;
}
SQLiteIndexConstraintUsage[] constraintUsages = outputs.ConstraintUsages;
if (constraintUsages == null)
{
return;
}
Type type2 = typeof(UnsafeNativeMethods.sqlite3_index_constraint_usage);
int num5 = Marshal.SizeOf(type2);
for (int k = 0; k < num1; k++)
{
IntPtr intPtr4 = SQLiteMarshal.IntPtrForOffset(zero, k * num5);
UnsafeNativeMethods.sqlite3_index_constraint_usage sqlite3IndexConstraintUsage = (UnsafeNativeMethods.sqlite3_index_constraint_usage)Marshal.PtrToStructure(intPtr4, type2);
constraintUsages[k] = new SQLiteIndexConstraintUsage(sqlite3IndexConstraintUsage);
}
num = SQLiteMarshal.NextOffsetOf(num, IntPtr.Size, 4);
outputs.IndexNumber = SQLiteMarshal.ReadInt32(pIndex, num);
num = SQLiteMarshal.NextOffsetOf(num, 4, IntPtr.Size);
outputs.IndexString = SQLiteString.StringFromUtf8IntPtr(SQLiteMarshal.ReadIntPtr(pIndex, num));
num = SQLiteMarshal.NextOffsetOf(num, IntPtr.Size, 4);
outputs.NeedToFreeIndexString = SQLiteMarshal.ReadInt32(pIndex, num);
num = SQLiteMarshal.NextOffsetOf(num, 4, 4);
outputs.OrderByConsumed = SQLiteMarshal.ReadInt32(pIndex, num);
num = SQLiteMarshal.NextOffsetOf(num, 4, 8);
outputs.EstimatedCost = new double?(SQLiteMarshal.ReadDouble(pIndex, num));
num = SQLiteMarshal.NextOffsetOf(num, 8, 8);
if (outputs.CanUseEstimatedRows())
{
outputs.EstimatedRows = new long?(SQLiteMarshal.ReadInt64(pIndex, num));
}
num = SQLiteMarshal.NextOffsetOf(num, 8, 4);
if (outputs.CanUseIndexFlags())
{
outputs.IndexFlags = new SQLiteIndexFlags?((SQLiteIndexFlags)SQLiteMarshal.ReadInt32(pIndex, num));
}
num = SQLiteMarshal.NextOffsetOf(num, 4, 8);
if (outputs.CanUseColumnsUsed())
{
outputs.ColumnsUsed = new long?(SQLiteMarshal.ReadInt64(pIndex, num));
}
}
}
public override SQLiteErrorCode BestIndex(SQLiteVirtualTable table, SQLiteIndex index)
{
this.CheckDisposed();
return(this.GetMethodResultCode("BestIndex"));
}
public virtual bool BestIndex(SQLiteIndex index)
{
this.CheckDisposed();
this.index = index;
return(true);
}