public void parse(iRiffChunk chunk)
{
if (chunk.parentTag == ACON && chunk.tag == ANIH)
{
header = chunk.read <ANIHeader>();
if (header.cbSizeOf != Marshal.SizeOf <ANIHeader>())
{
throw new ArgumentException("ANI header has wrong size");
}
frames = new Frame[header.cFrames];
return;
}
if (chunk.parentTag == FRAM && chunk.tag == ICON)
{
if (null == frames)
{
throw new ArgumentException("ANI header not found");
}
if (chunk.index >= frames.Length)
{
throw new ArgumentException("Too many frames in the ANI");
}
frames[chunk.index] = new Frame(chunk);
parsedFrames = chunk.index + 1;
return;
}
}
/// <summary>Read a structure from RIFF chunk</summary>
public static T read <T>(this iRiffChunk chunk) where T : unmanaged
{
T result = new T();
chunk.read(MiscUtils.asSpan(ref result));
return(result);
}
internal Frame(iRiffChunk chunk)
{
var header = chunk.read <ICONDIR>();
if (header.idReserved != 0)
{
throw new ArgumentException("The stream is not a valid cursor file");
}
if (header.idType != eImageType.Cursor)
{
if (header.idType == eImageType.Icon)
{
throw new ArgumentException("The stream contains an icon, not a cursor");
}
throw new ArgumentException("The stream is not a valid cursor file");
}
if (header.idCount <= 0)
{
throw new ArgumentException("The stream doesn't have any images");
}
// Read the directory
images = new ICONDIRECTORY[header.idCount];
chunk.read(images);
// Sort the entries so we don't have to rewind the stream
Array.Sort(images, (a, b) => a.imageOffset.CompareTo(b.imageOffset));
// Construct the payloads, and read initial 4 bytes of each image.
payloads = new Payload[header.idCount];
for (int i = 0; i < header.idCount; i++)
{
int skipBytes = chunk.chunkOffset + images[i].imageOffset - chunk.currentOffset;
chunk.skip(skipBytes);
int offset = chunk.currentOffset;
uint hh = chunk.read <uint>();
int cb = images[i].sizeInBytes;
payloads[i] = new Payload(offset, cb, hh);
}
}
/// <summary>Read an array of structures from RIFF chunk</summary>
public static void read <T>(this iRiffChunk chunk, T[] arr) where T : unmanaged
{
var span = MemoryMarshal.Cast <T, byte>(arr.AsSpan());
chunk.read(span);
}
static void consumeChunk(iRiffChunk chunk)
{
Console.WriteLine(chunk);
}