https://bz.apache.org/bugzilla/show_bug.cgi?id=67774
Bug ID: 67774
Summary: Support empty string ContentType in OPC package
Product: POI
Version: 5.3.x-dev
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: OPC
Assignee: dev@poi.apache.org
Reporter: olivier.schm...@metaintegration.com
Target Milestone: ---
The Microsoft PowerBI PBIX file format is an OPC package file type.
It contains file [Content_Types].xml which declares the content types of parts.
Unfortunately, the content types are declared as empty strings.
Apache POI code throws an exception, when trying to open the file.
Is it possible to support empty string content type for parts?
Here is sample java code and exception:
import java.io.File;
import java.util.List;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.openxml4j.opc.PackagePart;
import org.apache.poi.openxml4j.opc.PackagePartName;
void test(String filePath) {
File file = new File(filePath);
OPCPackage opcPackage = OPCPackage.open(file);
List<PackagePart> parts = opcPackage.getParts();
for (PackagePart part: parts) {
PackagePartName name = part.getPartName();
System.out.println(name.getName());
}
}
org.apache.poi.openxml4j.exceptions.InvalidFormatException: The specified
content type '' is not compliant with RFC 2616: malformed content type.
at
org.apache.poi.openxml4j.opc.internal.ContentType.<init>(ContentType.java:152)
at org.apache.poi.openxml4j.opc.ZipPackagePart.<init>(ZipPackagePart.java:82)
at
org.apache.poi.openxml4j.opc.ZipPackage$EntryTriple.register(ZipPackage.java:377)
at org.apache.poi.openxml4j.opc.ZipPackage.getPartsImpl(ZipPackage.java:326)
at org.apache.poi.openxml4j.opc.OPCPackage.getParts(OPCPackage.java:749)
at org.apache.poi.openxml4j.opc.OPCPackage.open(OPCPackage.java:288)
at org.apache.poi.openxml4j.opc.OPCPackage.open(OPCPackage.java:192)
The equivalent test program written with VisualStudio 2019 and C# .Net works
fine.
using System.IO.Packaging;
void test(String filePath) {
Package pack = Package.Open(filePath, System.IO.FileMode.Open);
PackagePartCollection parts = pack.GetParts();
foreach (PackagePart part in parts) {
}
}
The DotNet source code supports empty contentTypes:
https://github.com/dotnet/runtime/blob/main/src/libraries/System.IO.Packaging/src/System/IO/Packaging/ZipPackage.cs
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