public int CalcCRC()
{
if (Buffer == null)
{
return(0);
}
return(CRCCalc.Calc(Buffer));
}
public static SharedImage CreateForResource(string resourceID)
{
SharedImage image = new SharedImage();
image.m_ResourceName = resourceID;
// Note that the CRC must NOT use string.GetHashCode because that can vary between machines. The value is stored in the data and must be reproducible
image.CRC = CRCCalc.Calc(System.Text.Encoding.Unicode.GetBytes(resourceID));
return(image);
}
/// <summary>it is assumed that the document has already been checked for any duplicates</summary>
public static SharedImage CreateFromFile(string file, int CRC = 0)
{
if (CRC == 0)
{
CRC = CRCCalc.Calc(file);
}
return(new SharedImage {
m_Image = new MemoryImage(file), CRC = CRC
});
}
public static SharedResource CreateFromBuffer(byte[] buffer, string fileExtension)
{
Debug.Assert(fileExtension.StartsWith("."));
SharedResource resource = new SharedResource();
resource.Buffer = buffer;
resource.CRC = CRCCalc.Calc(resource.Buffer);
resource.Filename = "auto" + fileExtension;
return(resource);
}
public static SharedResource CreateFromFile(string file, int CRC = 0)
{
SharedResource resource = new SharedResource();
resource.Buffer = File.ReadAllBytes(file);
resource.Filename = Path.GetFileName(file);
if (CRC == 0)
{
CRC = CRCCalc.Calc(resource.Buffer);
}
resource.CRC = CRC;
return(resource);
}
public static SharedResource CreateFromStream(Stream strm, string fileExtension, int intCRC = 0)
{
Debug.Assert(fileExtension.StartsWith("."));
SharedResource resource = new SharedResource();
int length = (int)strm.Length;
strm.Seek(0, SeekOrigin.Begin);
resource.Buffer = new byte[length - 1 + 1];
strm.Read(resource.Buffer, 0, length);
// we don't keep the original stream, just the buffer we have filled from it
if (intCRC == 0)
{
intCRC = CRCCalc.Calc(resource.Buffer);
}
resource.CRC = intCRC;
resource.Filename = "auto" + fileExtension;
return(resource);
}
