/// <summary>
/// Gets the image format from the leading byte identifiers.
/// </summary>
/// <param name="path">The path to the image file.</param>
/// <returns>The image format.</returns>
public static ImgFormat GetImageFormat(string path)
{
if (string.IsNullOrEmpty(path) || !File.Exists(path))
{
return(ImgFormat.nil);
}
try
{
using (FileStream fileStream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read))
using (BinaryReader binaryReader = new BinaryReader(fileStream))
{
byte[] magicBytes = new byte[MAX_MAGIC_BYTE_LENGTH];
for (int i = 0; i < MAX_MAGIC_BYTE_LENGTH; i += 1)
{
magicBytes[i] = binaryReader.ReadByte();
foreach (KeyValuePair <byte[], ImgFormat> kvPair in Image_Byte_Identifiers)
{
if (ByteHelper.StartsWith(magicBytes, kvPair.Key))
{
return(kvPair.Value);
}
}
}
return(ImgFormat.nil);
}
}
catch
{
return(ImgFormat.nil);
}
}
/// <summary>
/// Reads the first 5 bytes from the reader to identify a WORM image.
/// </summary>
/// <param name="binaryReader">The reader.</param>
/// <returns>The format of a worm image. nil for invalid</returns>
public static WormFormat GetWormFormat(BinaryReader binaryReader)
{
byte[] identifier = binaryReader.ReadBytes(5);
if (ByteHelper.StartsWith(identifier, IdentifierBytes_1))
{
return(WormFormat.wrm);
}
if (ByteHelper.StartsWith(identifier, IdentifierBytes_2))
{
return(WormFormat.dwrm);
}
return(WormFormat.nil);
}
/// <summary>
/// Gets the dimensions of an image.
/// </summary>
/// <param name="path">The path of the image to get the dimensions of.</param>
/// <returns>The dimensions of the specified image.</returns>
/// <exception cref="ArgumentException">The image was of an unrecognised format.</exception>
public static Size GetDimensions(BinaryReader binaryReader)
{
byte[] magicBytes = new byte[MAX_MAGIC_BYTE_LENGTH];
for (int i = 0; i < MAX_MAGIC_BYTE_LENGTH; i += 1)
{
magicBytes[i] = binaryReader.ReadByte();
foreach (KeyValuePair <byte[], Func <BinaryReader, Size> > kvPair in Image_Format_Decoders)
{
if (ByteHelper.StartsWith(magicBytes, kvPair.Key))
{
return(kvPair.Value(binaryReader));
}
}
}
return(Size.Empty);
}
/// <summary>
/// Checks if param 2 starts with param 1.
/// </summary>
/// <returns>True if param 2 starts with param 1.</returns>
public static bool StartsWith(this byte[] thisBytes, byte[] thatBytes)
{
return(ByteHelper.StartsWith(thatBytes, thisBytes));
}
