/// <summary>
/// Scans through the array and estimates the byte size of the field in this case.
/// </summary>
/// <param name="data">The data.</param>
/// <param name="dataOffset">The data offset.</param>
/// <returns>The byte size of the field.</returns>
public int GetInstBytes(byte[] data, long dataOffset)
{
int nCount;
int nInstBytes = 0;
long offset = dataOffset;
// Hard sized fields just return their constant size
if (NumBytes > -1)
{
return(NumBytes);
}
// Pointers have a 4 byte integer count and a 4 byte uint offset
if (Pointer != '\0')
{
nCount = Hfa.ReadInt32(data, offset);
offset += 8;
nInstBytes += 8;
}
else
{
// Anything other than a pointer only can have one item.
nCount = 1;
}
if (ItemType == 'b' && nCount != 0)
{
// BASEDATA
int nRows = Hfa.ReadInt32(data, offset);
offset += 4;
int nColumns = Hfa.ReadInt32(data, offset);
offset += 4;
HfaEpt baseItemType = (HfaEpt)Hfa.ReadInt16(data, offset);
nInstBytes += 12;
nInstBytes += ((baseItemType.GetBitCount() + 7) / 8) * nRows * nColumns;
}
else if (ItemObjectType == null)
{
nInstBytes += nCount * HfaDictionary.GetItemSize(ItemType);
}
else
{
for (int i = 0; i < nCount; i++)
{
nInstBytes += ItemObjectType.GetInstBytes(data, offset + nInstBytes);
}
}
return(nInstBytes);
}
/// <summary>
/// Gets the count for a particular instance of a field. This will normally be
/// the built in value, but for variable fields, this is extracted from the
/// data itself.
/// </summary>
/// <param name="data">The data.</param>
/// <param name="dataOffset">The data offset.</param>
/// <returns>The count for a particular instance of a field.</returns>
public int GetInstCount(byte[] data, long dataOffset)
{
if (Pointer == '\0')
{
return(ItemCount);
}
if (ItemType == 'b')
{
int numRows = Hfa.ReadInt32(data, dataOffset + 8);
int numColumns = Hfa.ReadInt32(data, dataOffset + 12);
return(numRows * numColumns);
}
return(Hfa.ReadInt32(data, dataOffset));
}
/// <summary>
/// Extracts the value.
/// </summary>
/// <param name="pszField">The psz field.</param>
/// <param name="nIndexValue">The index value.</param>
/// <param name="data">The data.</param>
/// <param name="dataOffset">The offset to start from.</param>
/// <param name="nDataSize">The data size.</param>
/// <param name="reqType">The req type.</param>
/// <param name="pReqReturn">The req return.</param>
/// <param name="extraOffset">This is used in the case of 'object' pointers where the indexed object is further in the data block.</param>
/// <returns>True, if the value could be extracted.</returns>
/// <exception cref="HfaInvalidCountException">Occurs if the count is less than zero for the header of a block of base data</exception>
public bool ExtractInstValue(string pszField, int nIndexValue, byte[] data, long dataOffset, int nDataSize, char reqType, out object pReqReturn, out int extraOffset)
{
extraOffset = 0;
pReqReturn = null;
string returnString = null;
int nIntRet = 0;
double dfDoubleRet = 0.0;
// it doesn't appear like remove this line will have side effects.
// int size = GetInstBytes(data, dataOffset);
int nInstItemCount = GetInstCount(data, dataOffset);
byte[] rawData = null;
long offset = dataOffset;
// Check the index value is valid. Eventually this will have to account for variable fields.
if (nIndexValue < 0 || nIndexValue >= nInstItemCount)
{
return(false);
}
// if this field contains a pointer then we will adjust the data offset relative to it.
if (Pointer != '\0')
{
long nOffset = Hfa.ReadUInt32(data, dataOffset + 4);
if (nOffset != (uint)(dataOffset + 8))
{
// It seems there was originally an exception that would have gone here.
// Original exception would have been pszFieldname.pszField points at nOffset, not nDataOffset +8 as expected.
}
offset += 8;
dataOffset += 8;
nDataSize -= 8;
}
// pointers to chara or uchar arrays are read as strings and then handled as a special case.
if ((ItemType == 'c' || ItemType == 'C') && reqType == 's')
{
// Ok, nasty, the original code simply "pointed" to the byte data at this point and cast the pointer.
// We probably need to cycle through until we reach the null character.
List <char> chars = new List <char>();
while ((char)data[offset] != '\0')
{
chars.Add((char)data[offset]);
offset++;
dataOffset++;
}
pReqReturn = new string(chars.ToArray());
}
switch (ItemType)
{
case 'c':
case 'C':
nIntRet = data[dataOffset + nIndexValue];
dfDoubleRet = nIntRet;
break;
case 'e':
case 's':
{
int nNumber = Hfa.ReadUInt16(data, dataOffset + (nIndexValue * 2));
nIntRet = nNumber;
dfDoubleRet = nIntRet;
if (ItemType == 'e' && nIntRet >= 0 && nIntRet < EnumNames.Count)
{
returnString = EnumNames[nIntRet];
}
}
break;
case 'S':
{
short nNumber = Hfa.ReadInt16(data, dataOffset + (nIndexValue * 2));
nIntRet = nNumber;
dfDoubleRet = nNumber;
}
break;
case 't':
case 'l':
{
long nNumber = Hfa.ReadUInt32(data, dataOffset + (nIndexValue * 2));
nIntRet = (int)nNumber;
dfDoubleRet = nNumber;
}
break;
case 'L':
{
int nNumber = Hfa.ReadInt32(data, dataOffset + (nIndexValue * 2));
nIntRet = nNumber;
dfDoubleRet = nNumber;
}
break;
case 'f':
{
float fNumber = Hfa.ReadSingle(data, dataOffset + (nIndexValue * 4));
dfDoubleRet = fNumber;
nIntRet = Convert.ToInt32(fNumber);
}
break;
case 'd':
{
dfDoubleRet = Hfa.ReadDouble(data, dataOffset + (nInstItemCount * 8));
nIntRet = Convert.ToInt32(dfDoubleRet);
}
break;
case 'b':
{
// BASE DATA
int nRows = Hfa.ReadInt32(data, dataOffset);
int nColumns = Hfa.ReadInt32(data, dataOffset + 4);
if (nIndexValue < 0 || nIndexValue >= nRows * nColumns)
{
return(false);
}
HfaEpt type = (HfaEpt)Hfa.ReadUInt16(data, dataOffset + 8);
// Ignore the 2 byte objecttype value
dataOffset += 12;
if (nRows < 0 || nColumns < 0)
{
throw new HfaInvalidCountException(nRows, nColumns);
}
switch (type)
{
case HfaEpt.U8:
dfDoubleRet = data[dataOffset + nIndexValue];
nIntRet = data[offset + nIndexValue];
break;
case HfaEpt.S16:
short tShort = Hfa.ReadInt16(data, dataOffset + (nIndexValue * 2));
dfDoubleRet = tShort;
nIntRet = tShort;
break;
case HfaEpt.U16:
int tUShort = Hfa.ReadUInt16(data, dataOffset + (nIndexValue * 2));
dfDoubleRet = tUShort;
nIntRet = tUShort;
break;
case HfaEpt.Single:
float tSingle = Hfa.ReadSingle(data, dataOffset + (nIndexValue * 4));
dfDoubleRet = tSingle;
nIntRet = Convert.ToInt32(tSingle);
break;
case HfaEpt.Double:
dfDoubleRet = Hfa.ReadDouble(data, dataOffset + (nIndexValue * 8));
nIntRet = Convert.ToInt32(dfDoubleRet);
break;
default:
pReqReturn = null;
return(false);
}
}
break;
case 'o':
if (ItemObjectType != null)
{
if (ItemObjectType.NumBytes > 0)
{
extraOffset = ItemObjectType.NumBytes * nIndexValue;
}
else
{
for (int iIndexCounter = 0; iIndexCounter < nIndexValue; iIndexCounter++)
{
extraOffset += ItemObjectType.GetInstBytes(data, dataOffset + extraOffset);
}
}
int len = ItemObjectType.GetInstBytes(data, dataOffset + extraOffset);
rawData = new byte[len];
Array.Copy(data, dataOffset + extraOffset, rawData, 0, len);
if (!string.IsNullOrEmpty(pszField))
{
return(ItemObjectType.ExtractInstValue(pszField, rawData, 0, rawData.Length, reqType, out pReqReturn));
}
}
break;
default: return(false);
}
// Handle appropriate representations
switch (reqType)
{
case 's':
{
if (returnString == null)
{
returnString = nIntRet.ToString();
}
pReqReturn = returnString;
return(true);
}
case 'd':
pReqReturn = dfDoubleRet;
return(true);
case 'i':
pReqReturn = nIntRet;
return(true);
case 'p':
pReqReturn = rawData;
return(true);
default: return(false);
}
}
/// <summary>
/// Dumps the fields value.
/// </summary>
/// <param name="fpOut">The output stream.</param>
/// <param name="data">The data.</param>
/// <param name="dataOffset">The offset to start from.</param>
/// <param name="dataSize">The data size.</param>
/// <param name="prefix">The prefix.</param>
public void DumpInstValue(Stream fpOut, byte[] data, long dataOffset, int dataSize, string prefix)
{
StreamWriter sw = new StreamWriter(fpOut);
int extraOffset;
int nEntries = GetInstCount(data, dataOffset);
// Special case for arrays of characters or uchars which are printed as a string
if ((ItemType == 'c' || ItemType == 'C') && nEntries > 0)
{
object value;
if (ExtractInstValue(null, 0, data, dataOffset, dataSize, 's', out value, out extraOffset))
{
sw.WriteLine(prefix + FieldName + " = '" + (string)value + "'");
}
else
{
sw.WriteLine(prefix + FieldName + " = (access failed)");
}
}
for (int iEntry = 0; iEntry < Math.Min(MaxEntryReport, nEntries); iEntry++)
{
sw.Write(prefix + FieldName);
if (nEntries > 1)
{
sw.Write("[" + iEntry + "]");
}
sw.Write(" = ");
object value;
switch (ItemType)
{
case 'f':
case 'd':
if (ExtractInstValue(null, iEntry, data, dataOffset, dataSize, 'd', out value, out extraOffset))
{
sw.Write(value + "\n");
}
else
{
sw.Write("(access failed)\n");
}
break;
case 'b':
int nRows = Hfa.ReadInt32(data, dataOffset + 8);
int nColumns = Hfa.ReadInt32(data, dataOffset + 12);
HfaEpt type = Hfa.ReadType(data, dataOffset + 16);
sw.Write(nRows + "x" + nColumns + " basedata of type " + type);
break;
case 'e':
if (ExtractInstValue(null, iEntry, data, dataOffset, dataSize, 's', out value, out extraOffset))
{
sw.Write((string)value);
}
else
{
sw.Write("(accessfailed)");
}
break;
case 'o':
if (!ExtractInstValue(null, iEntry, data, dataOffset, dataSize, 'p', out value, out extraOffset))
{
sw.WriteLine("(access failed)");
}
else
{
// the pointer logic here is death! Originally the pointer address was used
// nByteOffset = ((GByte*) val) - pabyData;
// This doesn't work in a safe context.
sw.Write("\n");
string szLongFieldName = prefix;
if (prefix.Length > 256)
{
szLongFieldName = prefix.Substring(0, 256);
}
ItemObjectType.DumpInstValue(fpOut, data, dataOffset + extraOffset, dataSize - extraOffset, szLongFieldName);
}
break;
default:
if (ExtractInstValue(null, iEntry, data, dataOffset, dataSize, 'i', out value, out extraOffset))
{
sw.WriteLine(value);
}
else
{
sw.WriteLine("(access failed)\n");
}
break;
}
}
if (nEntries > MaxEntryReport)
{
sw.Write(prefix + " ... remaining instances omitted ...\n");
}
if (nEntries == 0)
{
sw.Write(prefix + FieldName + " = (no values)\n");
}
}