lurongjiang opened a new issue, #1041:
URL: https://github.com/apache/poi/issues/1041
## Description
DOC files created by WPS Office (Kingsoft Office) cannot be parsed by Apache
POI. The files have valid OLE2 headers (`D0 CF 11 E0`) and are detected as
`application/msword` by Tika, but POI throws `IndexOutOfBoundsException: Block
XX not found` when attempting to parse them.
## Steps to Reproduce
1. Obtain a DOC file created by WPS Office (sample file attached)
2. Try to parse the file using POI HWPFDocument or Tika
Example code:
```java
try (FileInputStream fis = new FileInputStream("sample.doc")) {
HWPFDocument document = new HWPFDocument(fis);
WordExtractor extractor = new WordExtractor(document);
String text = extractor.getText();
} catch (Exception e) {
e.printStackTrace();
}
```
## Expected Behavior
The DOC file should be parsed successfully, returning the document text
content.
## Actual Behavior
```
java.lang.IndexOutOfBoundsException: Block 52 not found
at
org.apache.poi.poifs.filesystem.POIFSFileSystem.getBlockAt(POIFSFileSystem.java:474)
...
Caused by: java.lang.IndexOutOfBoundsException: Unable to read 512 bytes
from 27136 in stream of length 26750
```
## File Analysis
### File Header
- File size: 26,750 bytes
- Magic bytes: `D0 CF 11 E0 A1 B1 1A E1` (valid OLE2 signature)
- Tika detects as: `application/msword`
### OLE2 Structure (from header)
```
Offset 0x00: D0 CF 11 E0 A1 B1 1A E1 00 00 00 00 00 00 00 00
Offset 0x10: 00 00 00 00 00 00 00 00 3E 00 03 00 FE FF 09 00
Offset 0x20: 06 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00
Offset 0x30: 01 00 00 00 00 00 00 00 00 10 00 00 02 00 00 00
Offset 0x40: 01 00 00 00 FE FF FF FF 00 00 00 00 00 00 00 00
```
- FAT size: 1 byte
- FAT block count: 1
- First FAT sector ID: 0
- MiniFAT block count: -2 (0xFFFFFFFE)
### WPS Signature Found
The file contains WPS-specific metadata:
- `WPS Office_11.1.0.10009`
- `KSOTemplate`
- `KSOProductBuildVer`
### Comparison with WPS "Save As" Fixed File
When the same file is saved again using WPS (Save As -> doc), the new file:
- Size: 25,536 bytes (reduced by 1,214 bytes)
- Header: **Identical** to original file
- Can be parsed successfully by POI
This indicates the issue is in the internal OLE2 structure (FAT chain), not
the file header.
## Environment
- Apache POI version: [5.2.5,5.5.1]
- Java version: 1.8
## Additional Notes
1. **WPS Office can directly open and edit these files** - no issues
2. When using WPS "Save As" (without any modification, just save to same
format), POI can parse the resulting file successfully
[22.doc](https://github.com/user-attachments/files/26533683/22.doc)
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