private static Hg3 Extract(Stream stream, string fileName, string directory, bool saveFrames, bool expand)
{
BinaryReader reader = new BinaryReader(stream);
HG3HDR hdr = reader.ReadUnmanaged <HG3HDR>();
if (hdr.Signature != "HG-3")
{
throw new UnexpectedFileTypeException(fileName, "HG-3");
}
//int backtrack = Marshal.SizeOf<HG3TAG>() - 1;
List <KeyValuePair <HG3STDINFO, List <long> > > imageOffsets = new List <KeyValuePair <HG3STDINFO, List <long> > >();
for (int i = 0; ; i++)
{
// NEW-NEW METHOD: We now know the next offset ahead
// of time from the HG3OFFSET we're going to read.
// Usually skips 0 bytes, otherwise usually 1-7 bytes.
long startPosition = stream.Position;
HG3OFFSET offset = reader.ReadUnmanaged <HG3OFFSET>();
HG3TAG tag = reader.ReadUnmanaged <HG3TAG>();
if (!HG3STDINFO.HasTagSignature(tag.Signature))
{
throw new Exception("Expected \"stdinfo\" tag!");
}
// NEW METHOD: Keep searching for the next stdinfo
// This way we don't miss any images
/*int offset = 0;
* while (!tag.Signature.StartsWith("stdinfo")) {
* if (stream.IsEndOfStream())
* break;
* stream.Position -= backtrack;
* tag = reader.ReadStruct<HG3TAG>();
* offset++;
* }
* if (stream.IsEndOfStream())
* break;*/
// OLD METHOD: Missed entries in a few files
//if (!tag.signature.StartsWith(StdInfoSignature))
// break;
HG3STDINFO stdInfo = reader.ReadUnmanaged <HG3STDINFO>();
List <long> frameOffsets = new List <long>();
imageOffsets.Add(new KeyValuePair <HG3STDINFO, List <long> >(stdInfo, frameOffsets));
while (tag.OffsetNext != 0)
{
tag = reader.ReadUnmanaged <HG3TAG>();
string signature = tag.Signature;
if (HG3IMG.HasTagSignature(signature)) // "img####"
{
frameOffsets.Add(stream.Position);
// Skip this tag
stream.Position += tag.Length;
}
/*else if (HG3ATS.HasTagSignature(signature)) { // "ats####"
* // Skip this tag
* stream.Position += tag.Length;
* }
* else if (HG3CPTYPE.HasTagSignature(signature)) { // "cptype"
* // Skip this tag
* stream.Position += tag.Length;
* }
* else if (HG3IMG_AL.HasTagSignature(signature)) { // "img_al"
* // Skip this tag
* stream.Position += tag.Length;
* }
* else if (HG3IMG_JPG.HasTagSignature(signature)) { // "img_jpg"
* // Skip this tag
* stream.Position += tag.Length;
* }
* else if (HG3IMGMODE.HasTagSignature(signature)) { // "imgmode"
* // Skip this tag
* stream.Position += tag.Length;
* }*/
else
{
// Skip this unknown tag
stream.Position += tag.Length;
}
}
if (offset.OffsetNext == 0)
{
break; // End of stream
}
stream.Position = startPosition + offset.OffsetNext;
}
HG3STDINFO[] stdInfos = imageOffsets.Select(p => p.Key).ToArray();
long[][] allFrameOffsets = imageOffsets.Select(p => p.Value.ToArray()).ToArray();
Hg3 hg3 = new Hg3(Path.GetFileName(fileName), hdr, stdInfos, allFrameOffsets, saveFrames && expand);
// Save any frames after we've located them all.
// This way we truely know if something is an animation.
if (saveFrames)
{
for (int imgIndex = 0; imgIndex < hg3.Count; imgIndex++)
{
HG3STDINFO stdInfo = stdInfos[imgIndex];
Hg3Image hg3Image = hg3.Images[imgIndex];
for (int frmIndex = 0; frmIndex < hg3Image.FrameCount; frmIndex++)
{
stream.Position = hg3Image.FrameOffsets[frmIndex];
HG3IMG imghdr = reader.ReadUnmanaged <HG3IMG>();
string pngFile = hg3.GetFrameFilePath(directory, imgIndex, frmIndex);
ExtractBitmap(reader, stdInfo, imghdr, expand, pngFile);
}
}
}
return(hg3);
}
/// <summary>
/// Gets the file path for the PNG image with the specified image and frame indecies.
/// </summary>
/// <param name="directory">The directory of the <see cref="Hg3"/> images.</param>
/// <param name="frmIndex">
/// The second index, which is associated to a frame inside an <see cref="Hg3Image"/>.
/// </param>
/// <returns>The file path of the frame.</returns>
public string GetFrameFilePath(string directory, int frmIndex)
{
return(Hg3.GetFrameFilePath(directory, ImageIndex, frmIndex));
}
