/// <summary>
/// Clears out all objects and resources.
/// </summary>
private void ClearAll() {
if (this.mBmpTargaImage != null) {
this.mBmpTargaImage.Dispose();
this.mBmpTargaImage = null;
}
if (this.mImageByteHandle.IsAllocated)
this.mImageByteHandle.Free();
if (this.mThumbnailByteHandle.IsAllocated)
this.mThumbnailByteHandle.Free();
this.mObjTargaHeader = new TargaHeader();
this.mObjTargaExtensionArea = new TargaExtensionArea();
this.mObjTargaFooter = new TargaFooter();
this.mTGAFormat = ETGAFormat.UNKNOWN;
this.mStride = 0;
this.mPadding = 0;
this.rows.Clear();
this.row.Clear();
this.mFileName = string.Empty;
}
/// <summary>
/// Loads the Targa Footer information from the file.
/// </summary>
/// <param name="binReader">A BinaryReader that points the loaded file byte stream.</param>
private void LoadTGAFooterInfo(BinaryReader binReader) {
if (binReader != null && binReader.BaseStream != null && binReader.BaseStream.Length > 0 && binReader.BaseStream.CanSeek == true) {
try {
// set the cursor at the beginning of the signature string.
binReader.BaseStream.Seek((TargaConstants.FooterSignatureOffsetFromEnd * -1), SeekOrigin.End);
// read the signature bytes and convert to ascii string
string Signature = System.Text.Encoding.ASCII.GetString(binReader.ReadBytes(TargaConstants.FooterSignatureByteLength)).TrimEnd('\0');
// do we have a proper signature
if (string.Compare(Signature, TargaConstants.TargaFooterASCIISignature) == 0) {
// this is a NEW targa file.
// create the footer
this.mTGAFormat = ETGAFormat.NEW_TGA;
// set cursor to beginning of footer info
binReader.BaseStream.Seek((TargaConstants.FooterByteLength * -1), SeekOrigin.End);
// read the Extension Area Offset value
int ExtOffset = binReader.ReadInt32();
// read the Developer Directory Offset value
int DevDirOff = binReader.ReadInt32();
// skip the signature we have already read it.
binReader.ReadBytes(TargaConstants.FooterSignatureByteLength);
// read the reserved character
string ResChar = System.Text.Encoding.ASCII.GetString(binReader.ReadBytes(TargaConstants.FooterReservedCharByteLength)).TrimEnd('\0');
// set all values to our TargaFooter class
this.mObjTargaFooter.SetExtensionAreaOffset(ExtOffset);
this.mObjTargaFooter.SetDeveloperDirectoryOffset(DevDirOff);
this.mObjTargaFooter.SetSignature(Signature);
this.mObjTargaFooter.SetReservedCharacter(ResChar);
} else {
// this is not an ORIGINAL targa file.
this.mTGAFormat = ETGAFormat.ORIGINAL_TGA;
}
} catch (Exception ex) {
// clear all
this.ClearAll();
throw ex;
}
} else {
this.ClearAll();
throw new Exception(@"Error loading file, could not read file from disk.");
}
}
