public static BmpHeaderDirectory ProcessBytes(string file)
{
Com.Drew.Metadata.Metadata metadata = new Com.Drew.Metadata.Metadata();
InputStream stream = new FileInputStream(file);
new BmpReader().Extract(new Com.Drew.Lang.StreamReader(stream), metadata);
stream.Close();
BmpHeaderDirectory directory = metadata.GetDirectory <BmpHeaderDirectory>();
NUnit.Framework.Assert.IsNotNull(directory);
return(directory);
}
public virtual void TestMsPaint24bpp()
{
BmpHeaderDirectory directory = ProcessBytes("Tests/Data/24bpp-10x10.bmp");
Sharpen.Tests.IsFalse(directory.HasErrors());
Sharpen.Tests.AreEqual(10, directory.GetInt(BmpHeaderDirectory.TagImageWidth));
Sharpen.Tests.AreEqual(10, directory.GetInt(BmpHeaderDirectory.TagImageHeight));
Sharpen.Tests.AreEqual(24, directory.GetInt(BmpHeaderDirectory.TagBitsPerPixel));
Sharpen.Tests.AreEqual("None", directory.GetDescription(BmpHeaderDirectory.TagCompression));
Sharpen.Tests.AreEqual(0, directory.GetInt(BmpHeaderDirectory.TagXPixelsPerMeter));
Sharpen.Tests.AreEqual(0, directory.GetInt(BmpHeaderDirectory.TagYPixelsPerMeter));
Sharpen.Tests.AreEqual(0, directory.GetInt(BmpHeaderDirectory.TagPaletteColourCount));
Sharpen.Tests.AreEqual(0, directory.GetInt(BmpHeaderDirectory.TagImportantColourCount));
Sharpen.Tests.AreEqual(1, directory.GetInt(BmpHeaderDirectory.TagColourPlanes));
Sharpen.Tests.AreEqual(40, directory.GetInt(BmpHeaderDirectory.TagHeaderSize));
}
public virtual void Extract(SequentialReader reader, Com.Drew.Metadata.Metadata metadata)
{
BmpHeaderDirectory directory = metadata.GetOrCreateDirectory <BmpHeaderDirectory>();
// FILE HEADER
//
// 2 - magic number (0x42 0x4D = "BM")
// 4 - size of BMP file in bytes
// 2 - reserved
// 2 - reserved
// 4 - the offset of the pixel array
//
// BITMAP INFORMATION HEADER
//
// The first four bytes of the header give the size, which is a discriminator of the actual header format.
// See this for more information http://en.wikipedia.org/wiki/BMP_file_format
//
// BITMAPINFOHEADER (size = 40)
//
// 4 - size of header
// 4 - pixel width (signed)
// 4 - pixel height (signed)
// 2 - number of colour planes (must be set to 1)
// 2 - number of bits per pixel
// 4 - compression being used (needs decoding)
// 4 - pixel data length (not total file size, just pixel array)
// 4 - horizontal resolution, pixels/meter (signed)
// 4 - vertical resolution, pixels/meter (signed)
// 4 - number of colours in the palette (0 means no palette)
// 4 - number of important colours (generally ignored)
//
// BITMAPCOREHEADER (size = 12)
//
// 4 - size of header
// 2 - pixel width
// 2 - pixel height
// 2 - number of colour planes (must be set to 1)
// 2 - number of bits per pixel
//
// COMPRESSION VALUES
//
// 0 = None
// 1 = RLE 8-bit/pixel
// 2 = RLE 4-bit/pixel
// 3 = Bit field (or Huffman 1D if BITMAPCOREHEADER2 (size 64))
// 4 = JPEG (or RLE-24 if BITMAPCOREHEADER2 (size 64))
// 5 = PNG
// 6 = Bit field
reader.SetMotorolaByteOrder(false);
try
{
int magicNumber = reader.GetUInt16();
if (magicNumber != unchecked ((int)(0x4D42)))
{
directory.AddError("Invalid BMP magic number");
return;
}
// skip past the rest of the file header
reader.Skip(4 + 2 + 2 + 4);
int headerSize = reader.GetInt32();
directory.SetInt(BmpHeaderDirectory.TagHeaderSize, headerSize);
// We expect the header size to be either 40 (BITMAPINFOHEADER) or 12 (BITMAPCOREHEADER)
if (headerSize == 40)
{
// BITMAPINFOHEADER
directory.SetInt(BmpHeaderDirectory.TagImageWidth, reader.GetInt32());
directory.SetInt(BmpHeaderDirectory.TagImageHeight, reader.GetInt32());
directory.SetInt(BmpHeaderDirectory.TagColourPlanes, reader.GetInt16());
directory.SetInt(BmpHeaderDirectory.TagBitsPerPixel, reader.GetInt16());
directory.SetInt(BmpHeaderDirectory.TagCompression, reader.GetInt32());
// skip the pixel data length
reader.Skip(4);
directory.SetInt(BmpHeaderDirectory.TagXPixelsPerMeter, reader.GetInt32());
directory.SetInt(BmpHeaderDirectory.TagYPixelsPerMeter, reader.GetInt32());
directory.SetInt(BmpHeaderDirectory.TagPaletteColourCount, reader.GetInt32());
directory.SetInt(BmpHeaderDirectory.TagImportantColourCount, reader.GetInt32());
}
else
{
if (headerSize == 12)
{
directory.SetInt(BmpHeaderDirectory.TagImageWidth, reader.GetInt16());
directory.SetInt(BmpHeaderDirectory.TagImageHeight, reader.GetInt16());
directory.SetInt(BmpHeaderDirectory.TagColourPlanes, reader.GetInt16());
directory.SetInt(BmpHeaderDirectory.TagBitsPerPixel, reader.GetInt16());
}
else
{
directory.AddError("Unexpected DIB header size: " + headerSize);
}
}
}
catch (IOException)
{
directory.AddError("Unable to read BMP header");
}
}
public virtual void Extract([NotNull] SequentialReader reader, [NotNull] Com.Drew.Metadata.Metadata metadata)
{
BmpHeaderDirectory directory = new BmpHeaderDirectory();
metadata.AddDirectory(directory);
// FILE HEADER
//
// 2 - magic number (0x42 0x4D = "BM")
// 4 - size of BMP file in bytes
// 2 - reserved
// 2 - reserved
// 4 - the offset of the pixel array
//
// BITMAP INFORMATION HEADER
//
// The first four bytes of the header give the size, which is a discriminator of the actual header format.
// See this for more information http://en.wikipedia.org/wiki/BMP_file_format
//
// BITMAPINFOHEADER (size = 40)
//
// 4 - size of header
// 4 - pixel width (signed)
// 4 - pixel height (signed)
// 2 - number of colour planes (must be set to 1)
// 2 - number of bits per pixel
// 4 - compression being used (needs decoding)
// 4 - pixel data length (not total file size, just pixel array)
// 4 - horizontal resolution, pixels/meter (signed)
// 4 - vertical resolution, pixels/meter (signed)
// 4 - number of colours in the palette (0 means no palette)
// 4 - number of important colours (generally ignored)
//
// BITMAPCOREHEADER (size = 12)
//
// 4 - size of header
// 2 - pixel width
// 2 - pixel height
// 2 - number of colour planes (must be set to 1)
// 2 - number of bits per pixel
//
// COMPRESSION VALUES
//
// 0 = None
// 1 = RLE 8-bit/pixel
// 2 = RLE 4-bit/pixel
// 3 = Bit field (or Huffman 1D if BITMAPCOREHEADER2 (size 64))
// 4 = JPEG (or RLE-24 if BITMAPCOREHEADER2 (size 64))
// 5 = PNG
// 6 = Bit field
reader.SetMotorolaByteOrder(false);
try
{
int magicNumber = reader.GetUInt16();
if (magicNumber != unchecked((int)(0x4D42)))
{
directory.AddError("Invalid BMP magic number");
return;
}
// skip past the rest of the file header
reader.Skip(4 + 2 + 2 + 4);
int headerSize = reader.GetInt32();
directory.SetInt(BmpHeaderDirectory.TagHeaderSize, headerSize);
// We expect the header size to be either 40 (BITMAPINFOHEADER) or 12 (BITMAPCOREHEADER)
if (headerSize == 40)
{
// BITMAPINFOHEADER
directory.SetInt(BmpHeaderDirectory.TagImageWidth, reader.GetInt32());
directory.SetInt(BmpHeaderDirectory.TagImageHeight, reader.GetInt32());
directory.SetInt(BmpHeaderDirectory.TagColourPlanes, reader.GetInt16());
directory.SetInt(BmpHeaderDirectory.TagBitsPerPixel, reader.GetInt16());
directory.SetInt(BmpHeaderDirectory.TagCompression, reader.GetInt32());
// skip the pixel data length
reader.Skip(4);
directory.SetInt(BmpHeaderDirectory.TagXPixelsPerMeter, reader.GetInt32());
directory.SetInt(BmpHeaderDirectory.TagYPixelsPerMeter, reader.GetInt32());
directory.SetInt(BmpHeaderDirectory.TagPaletteColourCount, reader.GetInt32());
directory.SetInt(BmpHeaderDirectory.TagImportantColourCount, reader.GetInt32());
}
else
{
if (headerSize == 12)
{
directory.SetInt(BmpHeaderDirectory.TagImageWidth, reader.GetInt16());
directory.SetInt(BmpHeaderDirectory.TagImageHeight, reader.GetInt16());
directory.SetInt(BmpHeaderDirectory.TagColourPlanes, reader.GetInt16());
directory.SetInt(BmpHeaderDirectory.TagBitsPerPixel, reader.GetInt16());
}
else
{
directory.AddError("Unexpected DIB header size: " + headerSize);
}
}
}
catch (IOException)
{
directory.AddError("Unable to read BMP header");
}
}
