/// <summary>
/// Parses a byte buffer containing an ISO8583 message. The buffer must
/// not include the length header. If it includes the ISO message header,
/// then its length must be specified so the message type can be found.
/// </summary>
/// <param name="buf">The byte buffer containing the message, starting
/// at the ISO header or the message type.</param>
/// <param name="isoHeaderLength">Specifies the position at which the message
/// type is located, which is algo the length of the ISO header.</param>
/// <param name="encoder">The encoder to use for reading string values.</param>
/// <returns>The parsed message.</returns>
public IsoMessage ParseMessage(byte[] buf, int isoHeaderLength, Encoding encoder)
{
IsoMessage m = new IsoMessage(isoHeaderLength > 0 ? encoder.GetString(buf, 0, isoHeaderLength) : null);
int type = ((buf[isoHeaderLength] - 48) << 12)
| ((buf[isoHeaderLength + 1] - 48) << 8)
| ((buf[isoHeaderLength + 2] - 48) << 4)
| (buf[isoHeaderLength + 3] - 48);
m.Type = type;
//Parse the bitmap
bool extended = (HexByteValue(buf[isoHeaderLength + 4]) & 8) > 0;
BitArray bs = new BitArray(extended ? 128 : 64);
int pos = 0;
for (int i = isoHeaderLength + 4; i < isoHeaderLength + 20; i++)
{
int hex = HexByteValue(buf[i]);
bs.Set(pos++, (hex & 8) > 0);
bs.Set(pos++, (hex & 4) > 0);
bs.Set(pos++, (hex & 2) > 0);
bs.Set(pos++, (hex & 1) > 0);
}
//Extended bitmap?
if (bs.Get(0))
{
for (int i = isoHeaderLength + 20; i < isoHeaderLength + 36; i++)
{
int hex = HexByteValue(buf[i]);
bs.Set(pos++, (hex & 8) > 0);
bs.Set(pos++, (hex & 4) > 0);
bs.Set(pos++, (hex & 2) > 0);
bs.Set(pos++, (hex & 1) > 0);
}
pos = 36 + isoHeaderLength;
}
else
{
pos = 20 + isoHeaderLength;
}
//Parse each field
Dictionary <int, FieldParseInfo> guide = _parseMap[type];
List <int> index = _parseOrder[type];
foreach (int i in index)
{
FieldParseInfo fpi = guide[i];
if (i <= bs.Count)
{ // TM extended parsing
if (bs.Get(i - 1))
{
IsoValue val = fpi.Parse(buf, pos, encoder);
m.SetField(i, val);
pos += val.Length;
if (val.Type == IsoType.LLVAR || val.Type == IsoType.LLVARnp)
{
pos += 2;
//@@@ TAM temporary hardcode, must be a better way to parse Padding F
if (val.Type == IsoType.LLVAR && (val.Length % 2 != 0))
{
pos += 1;
}
}
else if (val.Type == IsoType.LLLVAR)
{
//@@@ TAM packe 3 change to 4 for Paymark
//pos += 3;
pos += 4;
}
else if (val.Type == IsoType.LLLVARnp) // for NAB the LLLVAR Non packed(ascci codec) will have HEX as length so 6 digits(303139 = 019)
{
pos += 6;
}
}
}
}
return(m);
}
/// <summary>
/// Creates a MessageFactory and configures it from the XML file read
/// from the absolute path specified.
/// </summary>
/// <param name="filename">An absolute path to the XML configuration file.</param>
/// <returns>A new configured MessageFactory.</returns>
public static MessageFactory CreateFromFile(string filename)
{
XmlDocument xml = new XmlDocument();
xml.Load(filename);
MessageFactory m = new MessageFactory();
foreach (XmlNode node in xml.DocumentElement.ChildNodes)
{
if (node.NodeType == XmlNodeType.Element)
{
if ("header".Equals(node.Name))
{
string type = node.Attributes["type"].Value;
string header = node.ChildNodes[0].Value;
m.SetIsoHeader(Convert.ToInt16(type, 16), header);
}
else if ("template".Equals(node.Name))
{
int type = Convert.ToInt16(node.Attributes["type"].Value, 16);
IsoMessage templ = new IsoMessage();
templ.Type = type;
foreach (XmlNode field in node.ChildNodes)
{
if (field.NodeType == XmlNodeType.Element && "field".Equals(field.Name))
{
int num = Convert.ToInt16(field.Attributes["num"].Value);
string ftype = field.Attributes["type"].Value;
string length = field.Attributes["length"] == null ? "0" : field.Attributes["length"].Value;
string val = field.ChildNodes[0].Value;
//Ir creando mensaje con esto
templ.SetValue(num, val,
(IsoType)Enum.Parse(typeof(IsoType), ftype),
Convert.ToInt16(length));
}
}
m.AddMessageTemplate(templ);
}
else if ("parse".Equals(node.Name))
{
int type = Convert.ToInt16(node.Attributes["type"].Value, 16);
Dictionary <int, FieldParseInfo> guide = new Dictionary <int, FieldParseInfo>();
foreach (XmlNode field in node.ChildNodes)
{
if (field.NodeType == XmlNodeType.Element && "field".Equals(field.Name))
{
string num = field.Attributes["num"].Value;
string ftype = field.Attributes["type"].Value;
XmlAttribute lenAttr = field.Attributes["length"];
int len = 0;
if (lenAttr != null)
{
len = Convert.ToInt16(lenAttr.Value);
}
//TODO ir creando guia con esto
FieldParseInfo fpi = new FieldParseInfo((IsoType)Enum.Parse(typeof(IsoType), ftype), len);
guide[Convert.ToInt16(num)] = fpi;
}
}
m.SetParseDictionary(type, guide);
}
else if ("assign-date".Equals(node.Name))
{
string val = node.Attributes["value"].Value;
m.AssignDate = "true".Equals(val);
}
}
}
return(m);
}
