渲染图像函数 pdfbox 的字体问题

Question

当我从PDF文档中读取页面时遇到错误。 此页面包含一个条形码，该条形码是 使用字体(AAAAAC+Code3de9(完成。仅当我使用 renderImage 函数时，才会出现此错误。
我使用2.0.17版本的pdfbox应用程序。

*déc. 02, 2019 9:34:13 AM org.apache.pdfbox.pdmodel.font.PDCIDFontType2 <init>
AVERTISSEMENT: Could not read embedded OTF for font AAAAAC+Code3de9
java.io.IOException: Illegal seek position: 2483278652
at org.apache.fontbox.ttf.MemoryTTFDataStream.seek(MemoryTTFDataStream.java:164)
at org.apache.fontbox.ttf.TrueTypeFont.readTable(TrueTypeFont.java:352)
at org.apache.fontbox.ttf.TTFParser.parseTables(TTFParser.java:173)
at org.apache.fontbox.ttf.TTFParser.parse(TTFParser.java:150)
at org.apache.fontbox.ttf.OTFParser.parse(OTFParser.java:79)
at org.apache.fontbox.ttf.OTFParser.parse(OTFParser.java:27)
at org.apache.fontbox.ttf.TTFParser.parse(TTFParser.java:106)
at org.apache.fontbox.ttf.OTFParser.parse(OTFParser.java:73)
at org.apache.pdfbox.pdmodel.font.PDCIDFontType2.<init>(PDCIDFontType2.java:112)
at org.apache.pdfbox.pdmodel.font.PDCIDFontType2.<init>(PDCIDFontType2.java:65)
at org.apache.pdfbox.pdmodel.font.PDFontFactory.createDescendantFont(PDFontFactory.java:139)
at org.apache.pdfbox.pdmodel.font.PDType0Font.<init>(PDType0Font.java:192)
at org.apache.pdfbox.pdmodel.font.PDFontFactory.createFont(PDFontFactory.java:97)
at org.apache.pdfbox.pdmodel.PDResources.getFont(PDResources.java:146)
at org.apache.pdfbox.contentstream.operator.text.SetFontAndSize.process(SetFontAndSize.java:61)
at org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:872)
at org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:506)
at org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:480)
at org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:153)
at org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:268)
at org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:321)
at org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:243)
at org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:203)
at patrick.mart1.impose.ImposeKosmedias$1.run(ImposeKosmedias.java:370)
déc. 02, 2019 9:34:13 AM org.apache.pdfbox.pdmodel.font.PDCIDFontType2 findFontOrSubstitute
AVERTISSEMENT: Using fallback font LiberationSans for CID-keyed TrueType font AAAAAC+Code3de9*

非常感谢您的帮助

Answer 1

这是基于源代码下载中的RemoveAllText.java示例。它会删除内容流中 F2 的选择，还会删除资源中的字体。它假设 F2 没有真正使用，即没有与 F2 相关的文本。与官方示例相比，仅更改了"createTokensWithoutText"。即使含义不同，我保留了所有名称，除了类名。

因此，此代码实际上仅适用于此文件或类似生成的文件。

public final class RemoveFontF2
{
/**
* Default constructor.
*/
private RemoveFontF2()
{
// example class should not be instantiated
}
/**
* This will remove all text from a PDF document.
*
* @param args The command line arguments.
*
* @throws IOException If there is an error parsing the document.
*/
public static void main(String[] args) throws IOException
{
if (args.length != 2)
{
usage();
}
else
{
PDDocument document = PDDocument.load(new File(args[0]));
if (document.isEncrypted())
{
System.err.println(
"Error: Encrypted documents are not supported for this example.");
System.exit(1);
}
for (PDPage page : document.getPages())
{
List<Object> newTokens = createTokensWithoutText(page);
PDStream newContents = new PDStream(document);
writeTokensToStream(newContents, newTokens);
page.setContents(newContents);
processResources(page.getResources());
}
document.save(args[1]);
document.close();
}
}
private static void processResources(PDResources resources) throws IOException
{
for (COSName name : resources.getXObjectNames())
{
PDXObject xobject = resources.getXObject(name);
if (xobject instanceof PDFormXObject)
{
PDFormXObject formXObject = (PDFormXObject) xobject;
writeTokensToStream(formXObject.getContentStream(),
createTokensWithoutText(formXObject));
processResources(formXObject.getResources());
}
}
for (COSName name : resources.getPatternNames())
{
PDAbstractPattern pattern = resources.getPattern(name);
if (pattern instanceof PDTilingPattern)
{
PDTilingPattern tilingPattern = (PDTilingPattern) pattern;
writeTokensToStream(tilingPattern.getContentStream(),
createTokensWithoutText(tilingPattern));
processResources(tilingPattern.getResources());
}
}
}
private static void writeTokensToStream(PDStream newContents, List<Object> newTokens) throws IOException
{
OutputStream out = newContents.createOutputStream(COSName.FLATE_DECODE);
ContentStreamWriter writer = new ContentStreamWriter(out);
writer.writeTokens(newTokens);
out.close();
}
private static List<Object> createTokensWithoutText(PDContentStream contentStream) throws IOException
{
PDFStreamParser parser = new PDFStreamParser(contentStream);
Object token = parser.parseNextToken();
List<Object> newTokens = new ArrayList<Object>();
while (token != null)
{
if (token instanceof Operator)
{
Operator op = (Operator) token;
String opName = op.getName();
if (OperatorName.SET_FONT_AND_SIZE.equals(opName) &&
newTokens.get(newTokens.size() - 2).equals(COSName.getPDFName("F2")))
{
// remove the 2 arguments to this operator
newTokens.remove(newTokens.size() - 1);
newTokens.remove(newTokens.size() - 1);
token = parser.parseNextToken();
continue;
}
}
newTokens.add(token);
token = parser.parseNextToken();
}
// remove F2
COSBase fontBase = contentStream.getResources().getCOSObject().getItem(COSName.FONT);
if (fontBase instanceof COSDictionary)
{
((COSDictionary) fontBase).removeItem(COSName.getPDFName("F2"));
}
return newTokens;
}
/**
* This will print the usage for this document.
*/
private static void usage()
{
System.err.println("Usage: java " + RemoveFontF2.class.getName() + " <input-pdf> <output-pdf>");
}
}