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package org.apache.pdfbox.preflight.font;
import static org.apache.pdfbox.preflight.PreflightConstants.ERROR_FONTS_CIDKEYED_CIDTOGID;
import static org.apache.pdfbox.preflight.PreflightConstants.ERROR_FONTS_CIDKEYED_SYSINFO;
import static org.apache.pdfbox.preflight.PreflightConstants.ERROR_FONTS_DICTIONARY_INVALID;
import static org.apache.pdfbox.preflight.PreflightConstants.FONT_DICTIONARY_VALUE_CMAP_IDENTITY;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSDocument;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSStream;
import org.apache.pdfbox.pdmodel.font.PDCIDFont;
import org.apache.pdfbox.preflight.PreflightContext;
import org.apache.pdfbox.preflight.ValidationResult.ValidationError;
import org.apache.pdfbox.preflight.font.container.FontContainer;
import org.apache.pdfbox.preflight.utils.COSUtils;
public abstract class DescendantFontValidator<T extends FontContainer> extends SimpleFontValidator<T>
{
protected COSDocument cosDocument = null;
public DescendantFontValidator(PreflightContext context, PDCIDFont font, T fContainer)
{
super(context, font, font.getCOSObject(), fContainer);
cosDocument = context.getDocument().getDocument();
}
@Override
protected void checkMandatoryField()
{
boolean arePresent = fontDictionary.containsKey(COSName.TYPE);
arePresent &= fontDictionary.containsKey(COSName.SUBTYPE);
arePresent &= fontDictionary.containsKey(COSName.BASE_FONT);
arePresent &= fontDictionary.containsKey(COSName.CIDSYSTEMINFO);
arePresent &= fontDictionary.containsKey(COSName.FONT_DESC);
if (!arePresent)
{
this.fontContainer.push(new ValidationError(ERROR_FONTS_DICTIONARY_INVALID, "Required keys are missing"));
}
checkCIDSystemInfo(fontDictionary.getItem(COSName.CIDSYSTEMINFO));
checkCIDToGIDMap(fontDictionary.getItem(COSName.CID_TO_GID_MAP));
}
/**
* Check the content of the CIDSystemInfo dictionary. A CIDSystemInfo dictionary must contain :
* <UL>
* <li>a Name - Registry
* <li>a Name - Ordering
* <li>a Integer - Supplement
* </UL>
*
* @param sysinfo
*/
protected void checkCIDSystemInfo(COSBase sysinfo)
{
COSDictionary cidSysInfo = COSUtils.getAsDictionary(sysinfo, cosDocument);
if (cidSysInfo != null)
{
COSBase reg = cidSysInfo.getItem(COSName.REGISTRY);
COSBase ord = cidSysInfo.getItem(COSName.ORDERING);
COSBase sup = cidSysInfo.getItem(COSName.SUPPLEMENT);
if (!(COSUtils.isString(reg, cosDocument) && COSUtils.isString(ord, cosDocument) && COSUtils.isInteger(sup,
cosDocument)))
{
this.fontContainer.push(new ValidationError(ERROR_FONTS_CIDKEYED_SYSINFO));
}
}
else
{
this.fontContainer.push(new ValidationError(ERROR_FONTS_CIDKEYED_SYSINFO));
}
}
/**
* This method checks the CIDtoGIDMap entry of the Font dictionary. call the
* {@linkplain #checkCIDToGIDMap(COSBase, boolean)} with right parameters
* according to the instance of DescendantFontValidator
*
* @param ctog
*/
protected abstract void checkCIDToGIDMap(COSBase ctog);
/**
* This method checks the CIDtoGIDMap entry of the Font dictionary. This
* element must be a Stream or a Name. If it is a name, it must be
* "Identity" otherwise, the PDF file isn't a PDF/A-1b.
*
* If the validation fails the list of errors in the FontContainer is
* updated.
*
* If the CIDtoGIDMap is a Stream, it is parsed as a CMap and the result is
* returned.
*
* @param ctog
* @param mandatory true for CIDType2 , false for CIDType0
*/
protected void checkCIDToGIDMap(COSBase ctog, boolean mandatory)
{
if (COSUtils.isString(ctog, cosDocument))
{
// ---- valid only if the string is Identity
String ctogStr = COSUtils.getAsString(ctog, cosDocument);
if (!FONT_DICTIONARY_VALUE_CMAP_IDENTITY.equals(ctogStr))
{
this.fontContainer.push(new ValidationError(ERROR_FONTS_CIDKEYED_CIDTOGID,
"The CIDToGID entry is invalid"));
}
}
else if (COSUtils.isStream(ctog, cosDocument))
{
try
{
COSStream stream = COSUtils.getAsStream(ctog, cosDocument);
// todo: check the map's content? (won't pdfbox do this?)
InputStream is = stream.getUnfilteredStream();
ByteArrayOutputStream os = new ByteArrayOutputStream();
byte[] map = os.toByteArray();
}
catch (IOException e)
{
// map can be invalid, return a Validation Error
this.fontContainer.push(new ValidationError(ERROR_FONTS_CIDKEYED_CIDTOGID));
}
}
else if (mandatory)
{
this.fontContainer.push(new ValidationError(ERROR_FONTS_CIDKEYED_CIDTOGID));
}
}
}