internal unsafe static IntPtr SetColumn(int var_type,
IntPtr var_ptr, int len, string column_name,
int statement, IntPtr data_ptr,
void *user_data)
{
CLI.UnmanagedBuffer *buffer = (CLI.UnmanagedBuffer *)user_data;
if (var_type == (int)CLI.FieldType.cli_asciiz || var_type == (int)CLI.FieldType.cli_pasciiz)
{
SetBufferTypeAndSize(buffer, (CLI.FieldType)var_type, len, true);
return(buffer->data);
}
else if (CLI.IsArrayType((CLI.FieldType)var_type))
{
if (buffer->fetch_data)
{
SetBufferTypeAndSize(buffer, (CLI.FieldType)var_type,
len * CLI.SizeOfCliType[(int)var_type - (int)CLI.FieldType.cli_array_of_oid], true);
return(buffer->data);
}
else
{
return(IntPtr.Zero); // FastDB won't fetch a field if we return nil
}
}
else // sanity check
{
throw new CliError("Unsupported type: " + Enum.GetName(typeof(CLI.FieldType), buffer->type));
}
}
protected unsafe static void SetBufferTypeAndSize(CLI.UnmanagedBuffer *buf,
CLI.FieldType NewType, int NewSize, bool TypeCheck)
{
int n;
if (!TypeCheck || CLI.IsArrayType(NewType))
{
n = NewSize;
}
else if (NewType == CLI.FieldType.cli_asciiz || NewType == CLI.FieldType.cli_pasciiz)
{
n = NewSize + 1;
}
else
{
n = CLI.SizeOfCliType[(int)NewType];
}
if (n > buf->capacity)
{
buf->data = Marshal.ReAllocCoTaskMem(buf->data, ALIGN(n));
buf->capacity = n;
}
buf->size = n;
if (buf->type != (int)NewType)
{
buf->type = (int)NewType;
}
}
internal unsafe static IntPtr GetColumn(int var_type, IntPtr var_ptr, ref int len,
string column_name, int statement,
void *user_data)
{
CLI.UnmanagedBuffer *buffer = (CLI.UnmanagedBuffer *)user_data;
if (CLI.IsArrayType((CLI.FieldType)var_type))
{
len = buffer->size / CLI.SizeOfCliType[var_type - (int)CLI.FieldType.cli_array_of_oid];
}
else if (var_type == (int)CLI.FieldType.cli_asciiz || var_type == (int)CLI.FieldType.cli_pasciiz)
{
len = buffer->size - 1;
}
else
{
len = buffer->size;
}
return(buffer->data);
}
