private static Hg3FrameInfo ReadHg3FrameInfo(BinaryReader reader, HGXHDR hdr, bool frameOnly) { Stream stream = reader.BaseStream; long frameOffset = stream.Position; HG3FRAMEHDR frameHdr = reader.ReadUnmanaged <HG3FRAMEHDR>(); long tagStartPosition = stream.Position; HG3TAG tag = reader.ReadUnmanaged <HG3TAG>(); if (!HG3STDINFO.HasTagSignature(tag.Signature)) { throw new Exception("Expected \"stdinfo\" tag!"); } HG3STDINFO stdInfo = reader.ReadUnmanaged <HG3STDINFO>(); Hg3FrameInfo frameInfo = new Hg3FrameInfo(frameHdr, stdInfo, frameOffset); while (tag.OffsetNext != 0) { stream.Position = tagStartPosition + tag.OffsetNext; tagStartPosition = stream.Position; tag = reader.ReadUnmanaged <HG3TAG>(); string signature = tag.Signature; if (HG3IMG.HasTagSignature(signature, out int imdId)) // "img####" { HG3IMG img = reader.ReadUnmanaged <HG3IMG>(); frameInfo.AddTagImg(stream, tag, img, imdId); } else if (HG3IMG_AL.HasTagSignature(signature)) // "img_al" { HG3IMG_AL img = reader.ReadUnmanaged <HG3IMG_AL>(); frameInfo.AddTagImg(stream, tag, img, 0); } else if (HG3IMG_JPG.HasTagSignature(signature)) // "img_jpg" // There is no image info, reading it would increment by one byte which we don't want { frameInfo.AddTagImg(stream, tag, new HG3IMG_JPG(), 0); } else if (frameOnly) { if (frameInfo.Type != Hg3ImageType.None) { return(frameInfo); } } else if (HG3ATS.HasTagSignature(signature, out int atsId)) // "ats####" { HG3ATS ats = reader.ReadUnmanaged <HG3ATS>(); frameInfo.Ats.Add(atsId, ats); } else if (HG3CPTYPE.HasTagSignature(signature)) // "cptype" { HG3CPTYPE cpType = reader.ReadUnmanaged <HG3CPTYPE>(); frameInfo.CpType = cpType; } else if (HG3IMGMODE.HasTagSignature(signature)) // "imgmode" { HG3IMGMODE imgMode = reader.ReadUnmanaged <HG3IMGMODE>(); frameInfo.ImgMode = imgMode; } else { Trace.WriteLine($"UNKNOWN TAG: \"{signature}\""); } } return(frameInfo); }
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); }