public static void CleanUpNativeData(ref IntPtr pNativeData)
{
if (pNativeData != IntPtr.Zero)
{
var xsqlda = Marshal.PtrToStructure <XSQLDA>(pNativeData);
Marshal.DestroyStructure <XSQLDA>(pNativeData);
for (var i = 0; i < xsqlda.sqln; i++)
{
var ptr = GetIntPtr(pNativeData, ComputeLength(i));
var sqlvar = new XSQLVAR();
MarshalXSQLVARNativeToManaged(ptr, sqlvar, true);
if (sqlvar.sqldata != IntPtr.Zero)
{
Marshal.FreeHGlobal(sqlvar.sqldata);
sqlvar.sqldata = IntPtr.Zero;
}
if (sqlvar.sqlind != IntPtr.Zero)
{
Marshal.FreeHGlobal(sqlvar.sqlind);
sqlvar.sqlind = IntPtr.Zero;
}
Marshal.DestroyStructure <XSQLVAR>(ptr);
}
Marshal.FreeHGlobal(pNativeData);
pNativeData = IntPtr.Zero;
}
}
public static IntPtr MarshalManagedToNative(Charset charset, Descriptor descriptor)
{
var xsqlda = new XSQLDA
{
version = descriptor.Version,
sqln = descriptor.Count,
sqld = descriptor.ActualCount
};
var xsqlvar = new XSQLVAR[descriptor.Count];
for (var i = 0; i < xsqlvar.Length; i++)
{
xsqlvar[i] = new XSQLVAR
{
sqltype = descriptor[i].DataType,
sqlscale = descriptor[i].NumericScale,
sqlsubtype = descriptor[i].SubType,
sqllen = descriptor[i].Length
};
if (descriptor[i].HasDataType() && descriptor[i].DbDataType != DbDataType.Null)
{
var buffer = descriptor[i].DbValue.GetBytes();
xsqlvar[i].sqldata = Marshal.AllocHGlobal(buffer.Length);
Marshal.Copy(buffer, 0, xsqlvar[i].sqldata, buffer.Length);
}
else
{
xsqlvar[i].sqldata = Marshal.AllocHGlobal(0);
}
xsqlvar[i].sqlind = Marshal.AllocHGlobal(Marshal.SizeOf <short>());
Marshal.WriteInt16(xsqlvar[i].sqlind, descriptor[i].NullFlag);
xsqlvar[i].sqlname = GetStringBuffer(charset, descriptor[i].Name);
xsqlvar[i].sqlname_length = (short)descriptor[i].Name.Length;
xsqlvar[i].relname = GetStringBuffer(charset, descriptor[i].Relation);
xsqlvar[i].relname_length = (short)descriptor[i].Relation.Length;
xsqlvar[i].ownername = GetStringBuffer(charset, descriptor[i].Owner);
xsqlvar[i].ownername_length = (short)descriptor[i].Owner.Length;
xsqlvar[i].aliasname = GetStringBuffer(charset, descriptor[i].Alias);
xsqlvar[i].aliasname_length = (short)descriptor[i].Alias.Length;
}
return(MarshalManagedToNative(xsqlda, xsqlvar));
}
private static byte[] GetBytes(XSQLVAR xsqlvar)
{
if (xsqlvar.sqllen == 0 || xsqlvar.sqldata == IntPtr.Zero)
{
return(null);
}
var type = xsqlvar.sqltype & ~1;
switch (type)
{
case IscCodes.SQL_VARYING:
{
var buffer = new byte[Marshal.ReadInt16(xsqlvar.sqldata)];
var tmp = GetIntPtr(xsqlvar.sqldata, 2);
Marshal.Copy(tmp, buffer, 0, buffer.Length);
return(buffer);
}
case IscCodes.SQL_TEXT:
case IscCodes.SQL_SHORT:
case IscCodes.SQL_LONG:
case IscCodes.SQL_FLOAT:
case IscCodes.SQL_DOUBLE:
case IscCodes.SQL_D_FLOAT:
case IscCodes.SQL_QUAD:
case IscCodes.SQL_INT64:
case IscCodes.SQL_BLOB:
case IscCodes.SQL_ARRAY:
case IscCodes.SQL_TIMESTAMP:
case IscCodes.SQL_TYPE_TIME:
case IscCodes.SQL_TYPE_DATE:
case IscCodes.SQL_BOOLEAN:
case IscCodes.SQL_TIMESTAMP_TZ:
case IscCodes.SQL_TIMESTAMP_TZ_EX:
case IscCodes.SQL_TIME_TZ:
case IscCodes.SQL_TIME_TZ_EX:
case IscCodes.SQL_DEC16:
case IscCodes.SQL_DEC34:
case IscCodes.SQL_INT128:
{
var buffer = new byte[xsqlvar.sqllen];
Marshal.Copy(xsqlvar.sqldata, buffer, 0, buffer.Length);
return(buffer);
}
default:
throw TypeHelper.InvalidDataType(type);
}
}
public static Descriptor MarshalNativeToManaged(Charset charset, IntPtr pNativeData, bool fetching)
{
var xsqlda = Marshal.PtrToStructure <XSQLDA>(pNativeData);
var descriptor = new Descriptor(xsqlda.sqln)
{
ActualCount = xsqlda.sqld
};
var xsqlvar = new XSQLVAR();
for (var i = 0; i < xsqlda.sqln; i++)
{
var ptr = GetIntPtr(pNativeData, ComputeLength(i));
MarshalXSQLVARNativeToManaged(ptr, xsqlvar);
descriptor[i].DataType = xsqlvar.sqltype;
descriptor[i].NumericScale = xsqlvar.sqlscale;
descriptor[i].SubType = xsqlvar.sqlsubtype;
descriptor[i].Length = xsqlvar.sqllen;
descriptor[i].NullFlag = xsqlvar.sqlind == IntPtr.Zero
? (short)0
: Marshal.ReadInt16(xsqlvar.sqlind);
if (fetching)
{
if (descriptor[i].NullFlag != -1)
{
descriptor[i].SetValue(GetBytes(xsqlvar));
}
}
descriptor[i].Name = GetString(charset, xsqlvar.sqlname, xsqlvar.sqlname_length);
descriptor[i].Relation = GetString(charset, xsqlvar.relname, xsqlvar.relname_length);
descriptor[i].Owner = GetString(charset, xsqlvar.ownername, xsqlvar.ownername_length);
descriptor[i].Alias = GetString(charset, xsqlvar.aliasname, xsqlvar.aliasname_length);
}
return(descriptor);
}
private static void MarshalXSQLVARNativeToManaged(IntPtr ptr, XSQLVAR xsqlvar, bool onlyPointers = false)
{
unsafe
{
using (var reader = new BinaryReader(new UnmanagedMemoryStream((byte *)ptr.ToPointer(), SizeOfXSQLVAR)))
{
if (!onlyPointers)
{
xsqlvar.sqltype = reader.ReadInt16();
}
else
{
reader.BaseStream.Position += sizeof(short);
}
if (!onlyPointers)
{
xsqlvar.sqlscale = reader.ReadInt16();
}
else
{
reader.BaseStream.Position += sizeof(short);
}
if (!onlyPointers)
{
xsqlvar.sqlsubtype = reader.ReadInt16();
}
else
{
reader.BaseStream.Position += sizeof(short);
}
if (!onlyPointers)
{
xsqlvar.sqllen = reader.ReadInt16();
}
else
{
reader.BaseStream.Position += sizeof(short);
}
xsqlvar.sqldata = reader.ReadIntPtr();
xsqlvar.sqlind = reader.ReadIntPtr();
if (!onlyPointers)
{
xsqlvar.sqlname_length = reader.ReadInt16();
}
else
{
reader.BaseStream.Position += sizeof(short);
}
if (!onlyPointers)
{
xsqlvar.sqlname = reader.ReadBytes(32);
}
else
{
reader.BaseStream.Position += 32;
}
if (!onlyPointers)
{
xsqlvar.relname_length = reader.ReadInt16();
}
else
{
reader.BaseStream.Position += sizeof(short);
}
if (!onlyPointers)
{
xsqlvar.relname = reader.ReadBytes(32);
}
else
{
reader.BaseStream.Position += 32;
}
if (!onlyPointers)
{
xsqlvar.ownername_length = reader.ReadInt16();
}
else
{
reader.BaseStream.Position += sizeof(short);
}
if (!onlyPointers)
{
xsqlvar.ownername = reader.ReadBytes(32);
}
else
{
reader.BaseStream.Position += 32;
}
if (!onlyPointers)
{
xsqlvar.aliasname_length = reader.ReadInt16();
}
else
{
reader.BaseStream.Position += sizeof(short);
}
if (!onlyPointers)
{
xsqlvar.aliasname = reader.ReadBytes(32);
}
else
{
reader.BaseStream.Position += 32;
}
}
}
}
