public virtual void Extract(SequentialReader reader, Com.Drew.Metadata.Metadata metadata)
{
Com.Drew.Metadata.Directory directory = metadata.GetOrCreateDirectory<AdobeJpegDirectory>();
try
{
reader.SetMotorolaByteOrder(false);
if (!reader.GetString(5).Equals("Adobe"))
{
directory.AddError("Invalid Adobe JPEG data header.");
return;
}
directory.SetInt(AdobeJpegDirectory.TagDctEncodeVersion, reader.GetUInt16());
directory.SetInt(AdobeJpegDirectory.TagApp14Flags0, reader.GetUInt16());
directory.SetInt(AdobeJpegDirectory.TagApp14Flags1, reader.GetUInt16());
directory.SetInt(AdobeJpegDirectory.TagColorTransform, reader.GetInt8());
}
catch (IOException ex)
{
directory.AddError("IO exception processing data: " + ex.Message);
}
}
public virtual void Extract(SequentialReader reader, Com.Drew.Metadata.Metadata metadata)
{
GifHeaderDirectory directory = metadata.GetOrCreateDirectory<GifHeaderDirectory>();
// FILE HEADER
//
// 3 - signature: "GIF"
// 3 - version: either "87a" or "89a"
//
// LOGICAL SCREEN DESCRIPTOR
//
// 2 - pixel width
// 2 - pixel height
// 1 - screen and color map information flags (0 is LSB)
// 0-2 Size of the global color table
// 3 Color table sort flag (89a only)
// 4-6 Color resolution
// 7 Global color table flag
// 1 - background color index
// 1 - pixel aspect ratio
reader.SetMotorolaByteOrder(false);
try
{
string signature = reader.GetString(3);
if (!signature.Equals("GIF"))
{
directory.AddError("Invalid GIF file signature");
return;
}
string version = reader.GetString(3);
if (!version.Equals(Gif87aVersionIdentifier) && !version.Equals(Gif89aVersionIdentifier))
{
directory.AddError("Unexpected GIF version");
return;
}
directory.SetString(GifHeaderDirectory.TagGifFormatVersion, version);
directory.SetInt(GifHeaderDirectory.TagImageWidth, reader.GetUInt16());
directory.SetInt(GifHeaderDirectory.TagImageHeight, reader.GetUInt16());
short flags = reader.GetUInt8();
// First three bits = (BPP - 1)
int colorTableSize = 1 << ((flags & 7) + 1);
directory.SetInt(GifHeaderDirectory.TagColorTableSize, colorTableSize);
if (version.Equals(Gif89aVersionIdentifier))
{
bool isColorTableSorted = (flags & 8) != 0;
directory.SetBoolean(GifHeaderDirectory.TagIsColorTableSorted, isColorTableSorted);
}
int bitsPerPixel = ((flags & unchecked((int)(0x70))) >> 4) + 1;
directory.SetInt(GifHeaderDirectory.TagBitsPerPixel, bitsPerPixel);
bool hasGlobalColorTable = (flags & unchecked((int)(0xf))) != 0;
directory.SetBoolean(GifHeaderDirectory.TagHasGlobalColorTable, hasGlobalColorTable);
directory.SetInt(GifHeaderDirectory.TagTransparentColorIndex, reader.GetUInt8());
int aspectRatioByte = reader.GetUInt8();
if (aspectRatioByte != 0)
{
float pixelAspectRatio = (float)((aspectRatioByte + 15d) / 64d);
directory.SetFloat(GifHeaderDirectory.TagPixelAspectRatio, pixelAspectRatio);
}
}
catch (IOException)
{
directory.AddError("Unable to read BMP header");
}
}
/// <exception cref="System.IO.IOException"/>
private void ProcessTag(SequentialReader reader, Com.Drew.Metadata.Directory directory, int directoryType, int tagType, int tagByteCount)
{
int tagIdentifier = tagType | (directoryType << 8);
string @string = null;
switch (tagIdentifier)
{
case IptcDirectory.TagApplicationRecordVersion:
{
// short
int shortValue = reader.GetUInt16();
reader.Skip(tagByteCount - 2);
directory.SetInt(tagIdentifier, shortValue);
return;
}
case IptcDirectory.TagUrgency:
{
// byte
directory.SetInt(tagIdentifier, reader.GetUInt8());
reader.Skip(tagByteCount - 1);
return;
}
case IptcDirectory.TagReleaseDate:
case IptcDirectory.TagDateCreated:
{
// Date object
if (tagByteCount >= 8)
{
@string = reader.GetString(tagByteCount);
try
{
int year = System.Convert.ToInt32(Sharpen.Runtime.Substring(@string, 0, 4));
int month = System.Convert.ToInt32(Sharpen.Runtime.Substring(@string, 4, 6)) - 1;
int day = System.Convert.ToInt32(Sharpen.Runtime.Substring(@string, 6, 8));
DateTime date = new Sharpen.GregorianCalendar(year, month, day).GetTime();
directory.SetDate(tagIdentifier, date);
return;
}
catch (FormatException)
{
}
}
else
{
// fall through and we'll process the 'string' value below
reader.Skip(tagByteCount);
}
goto case IptcDirectory.TagReleaseTime;
}
case IptcDirectory.TagReleaseTime:
case IptcDirectory.TagTimeCreated:
default:
{
break;
}
}
// time...
// fall through
// If we haven't returned yet, treat it as a string
// NOTE that there's a chance we've already loaded the value as a string above, but failed to parse the value
if (@string == null)
{
@string = reader.GetString(tagByteCount, Runtime.GetProperty("file.encoding"));
}
// "ISO-8859-1"
if (directory.ContainsTag(tagIdentifier))
{
// this fancy string[] business avoids using an ArrayList for performance reasons
string[] oldStrings = directory.GetStringArray(tagIdentifier);
string[] newStrings;
if (oldStrings == null)
{
newStrings = new string[1];
}
else
{
newStrings = new string[oldStrings.Length + 1];
System.Array.Copy(oldStrings, 0, newStrings, 0, oldStrings.Length);
}
newStrings[newStrings.Length - 1] = @string;
directory.SetStringArray(tagIdentifier, newStrings);
}
else
{
directory.SetString(tagIdentifier, @string);
}
}