//***************************************************************************
// Private Methods
//
private void GetTags(byte[] data)
{
// The first thing we need to do is try and validate the binary stream.
// It *should* contain N sets of 12-byte lengths, so it the length
// of the data is not a multiple of 12, it's no good.
if (data.Length % 12 != 0)
{
throw new ArgumentException("The provided binary data does not appear to be valid. Binary stream must consist of N sets of 12-byte lengths.", "data");
}
// If the data is at least the correct length to be valid, determine the
// total number of tags in the stream.
int tagCnt = data.Length / 12;
// And, finally, start dumping the stream into TiffTag objects 12 bytes
// at a time.
for (int i = 0; i < tagCnt; i++)
{
byte[] val = new byte[12];
Array.Copy(data, i * 12, val, 0, 12);
TiffTag newTag = new TiffTag(this, val);
// We'll store the tags in the collection using the readable name of
// the tag as the key. This will make accessing individual tags
// later much easier.
this._tags.Add(newTag, newTag.TagID.ToString());
}
}
public object[] GetTagValues(TiffTagType tagType)
{
if (!this.HasTag(tagType))
{
return(null);
}
// First we have to retrieve the requested tag.
TiffTag tag = this.GetTag(tagType);
byte[] raw = tag.GetValue();
// Prepare a collection to hold the return values.
ObjectCollection retVal = new ObjectCollection();
// Next, we have to determine what kind of data we're dealing with.
switch (tag.FieldType)
{
case TiffFieldType.AsciiType:
string val = System.Text.ASCIIEncoding.ASCII.GetString(raw);
retVal.Add(val);
break;
case TiffFieldType.ByteType:
retVal.AddRange(raw);
break;
case TiffFieldType.LongType:
for (int i = 0; i < (raw.Length / 4); i++)
{
retVal.Add(Hex.GetInteger(
new byte[] {
raw[i * 4],
raw[(i * 4) + 1],
raw[(i * 4) + 2],
raw[(i * 4) + 3]
}));
}
break;
case TiffFieldType.ShortType:
for (int i = 0; i < (raw.Length / 2); i++)
{
retVal.Add(Hex.GetInteger(
new byte[] {
raw[i * 2],
raw[(i * 2) + 1]
}));
}
break;
case TiffFieldType.Rational:
for (int i = 0; i < (raw.Length / 8); i++)
{
int num = Hex.GetInteger(new byte[] { raw[i * 8], raw[(i * 8) + 1], raw[(i * 8) + 2], raw[(i * 8) + 3] });
int den = Hex.GetInteger(new byte[] { raw[(i * 8) + 4], raw[(i * 8) + 5], raw[(i * 8) + 6], raw[(i * 8) + 7] });
retVal.Add(num / den);
}
break;
}
// And, finally, return the value(s).
return(retVal.ToArray());
}
public void SetTag(int idfNum, TiffTagType tagType, params object[] value)
{
if (tagType == TiffTagType.StripOffsets || tagType == TiffTagType.StripByteCounts)
{
throw new Exception("The 'StripOffsets' and 'StripByteCounts' tags will be constructed automatically and may not be manually configured.");
}
ByteCollection tagBts = new ByteCollection();
tagBts.AddRange(Hex.GetBinary((short)tagType, this._littleEndian));
TiffFieldType fldType = (TiffFieldType)Enum.Parse(typeof(TiffTagIDFieldType), tagType.ToString());
tagBts.AddRange(Hex.GetBinary((short)fldType, this._littleEndian));
tagBts.AddRange(Hex.GetBinary(value.Length, this._littleEndian));
if (TiffTag.MustBePointer(fldType, value.Length) || fldType == TiffFieldType.AsciiType)
{
// We'll have to add the data to the _metaData ByteCollection,
// since it won't fit into the tag itself. We'll also need
// to make a pointer to the data in the tag.
int metaPointer = this._metaData.Count;
ByteCollection tmpMetaData = new ByteCollection();
// We need to process each passed value. Often there may be only
// one, but we still have to be prepared for multiple values.
for (int i = 0; i < value.Length; i++)
{
try
{
// First, we need to figure out what kind of data we're deeling with,
// since it will determine what we do with it.
switch (fldType)
{
case TiffFieldType.AsciiType:
// ASCII type is easy... we just convert the text to ASCII
// bytes and dump them to the metaData collection.
tmpMetaData.AddRange(System.Text.ASCIIEncoding.ASCII.GetBytes(value[i].ToString()));
break;
case TiffFieldType.ByteType:
tmpMetaData.Add((byte)value[i]);
break;
case TiffFieldType.ShortType:
tmpMetaData.AddRange(Hex.GetBinary((short)value[i], this._littleEndian));
break;
case TiffFieldType.LongType:
tmpMetaData.AddRange(Hex.GetBinary((int)value[i], this._littleEndian));
break;
case TiffFieldType.Rational:
string[] vals = ((string)value[i]).Split('/', '|');
tmpMetaData.AddRange(Hex.GetBinary(int.Parse(vals[0])));
tmpMetaData.AddRange(Hex.GetBinary(int.Parse(vals[1])));
break;
}
}
catch
{
// The most likely reson for ending up here is that we got
// passed some data that didn't match the field type for
// the specified field. Just chunk the error back up the
// stack and let the caller deal with it.
throw;
}
// We don't want to add the values to the actuall metaData
// collection until we're sure we've got it all processes
// and converted. Otherwise, we might end up wtih 'orphaned'
// meta data.
this._metaData.AddRange(tmpMetaData.ToArray());
tagBts.AddRange(Hex.GetBinary(metaPointer, this._littleEndian));
}
}
else
{
// The tag value is small enough to reside inside the tag itself.
// This automatically rules out certain data types such as
// Rational and ASCII, so we should only be dealing with
// Byte, Short, and Long here.
for (int i = 0; i < value.Length; i++)
{
if (value[i].GetType().Name.ToLower() == "int32")
{
tagBts.AddRange(Hex.GetBinary((short)value[i], this._littleEndian));
}
else if (value[i].GetType().Name.ToLower() == "int64")
{
tagBts.AddRange(Hex.GetBinary((int)value[i], this._littleEndian));
}
}
}
// If we ended up with less than 12 bytes for the tag data, it means
// we're storing a short or byte value that doesn't 'fill' the tag's
// value space, so we just need to add 'padding'.
int btShort = 12 - tagBts.Count;
for (int t = 0; t < btShort; t++)
{
tagBts.Add(byte.Parse("00"));
}
// Now, we're read to add the tag to the IDF.
this._idfs[idfNum].Tags.Add(new TiffTag(this._idfs[idfNum], tagBts.ToArray()));
}