protected FontFileType Identify()
{
Debug.Assert(m_fs != null);
FontFileType fft = FontFileType.INVALID;
// read the first four bytes in the file
MBOBuffer buf = ReadPaddedBuffer(0, 4);
if (buf != null)
{
OTTag tag = new OTTag(buf.GetBuffer());
if (IsValidSfntVersion(tag))
{
fft = FontFileType.SINGLE;
}
else if ((string)tag == "ttcf")
{
fft = FontFileType.COLLECTION;
}
}
return(fft);
}
/***************
* constructors
*/
/// <summary>Construct empty object except for <c>TableManager</c>
/// </summary>
public OTFile()
{
m_TableManager = new TableManager(this);
m_FontFileType = FontFileType.INVALID;
m_nFonts = 0;
m_ttch = null;
}
internal bool Analyze(
[Out] out FontFileType fontFileType,
[Out] out FontFaceType fontFaceType,
[Out] out uint numberOfFaces,
[Out] out int hr)
{
bool isSupported = false;
hr = _fontFile.Analyze(out isSupported, out fontFileType, out fontFaceType, out numberOfFaces);
return(isSupported);
}
internal bool Analyze(
[Out] out FontFileType fontFileType,
[Out] out FontFaceType fontFaceType,
[Out] out uint numberOfFaces)
{
bool isSupported = false;
int hr;
isSupported = Analyze(out fontFileType, out fontFaceType, out numberOfFaces, out hr);
Marshal.ThrowExceptionForHR(hr);
return(isSupported);
}
/// <summary>
/// Create a new <see cref="DescriptorFontFile"/>.
/// </summary>
public DescriptorFontFile(IndirectReferenceToken key, FontFileType fileType)
{
ObjectKey = key;
FileType = fileType;
}
/*****************
* private methods
*/
private bool TestFileType()
{
m_FontFileType = Identify();
switch (m_FontFileType)
{
case FontFileType.INVALID:
close();
return false;
case FontFileType.SINGLE:
m_ttch = null;
m_nFonts = 1;
return true;
case FontFileType.COLLECTION:
m_ttch = TTCHeader.ReadTTCHeader(this);
if (m_ttch != null)
{
m_nFonts = m_ttch.DirectoryCount;
}
else
{
m_nFonts = 0;
}
return true;
default:
close();
return false;
}
}
/// <summary>Close filestream and set type to file type to
/// invalid.</summary>
public void close()
{
if (m_fs != null)
{
m_fs.Close();
m_fs = null;
}
m_TableManager = new TableManager(this); // JJF: Why?
m_FontFileType = FontFileType.INVALID;
m_ttch = null;
m_nFonts = 0;
}
public DescriptorFontFile(IndirectReference key, FontFileType fileType)
{
ObjectKey = key;
FileBytes = new byte[0];
FileType = fileType;
}
