Done
https://issues.apache.org/jira/browse/PDFBOX-1232
Dave Smith
Candata Ltd.
416-493-9020x2413
Direct: 416-855-2413
On Tue, Feb 21, 2012 at 2:51 AM, Timo Boehme <timo.boe...@ontochem.com> wrote:
> Could you please open a JIRA issue for this problem?
>
>
> Thanks,
>
> Timo
>
>
> Am 21.02.2012 02:44, schrieb Dave Smith:
>>
>> I am having some problems with certain pdf docs and the FlateDecoder.
>> So for example
>>
>> A chunk like this ...
>> 3 0 obj
>> <<
>> /Type /XObject
>> /Subtype /Form
>> /FormType 1
>> /Resources<< /Font 4 0 R
>> /ProcSet [/PDF /ImageC /Text]>>
>> /BBox [0 0 595 842]
>> /Matrix [1 0 0 1 0 0]
>> /Filter /FlateDecode
>> /Length 5>>
>> stream
>> H<89>^C^@
>> endstream
>> endobj
>>
>> The blob is 72, -119, 3, 0, 13 decimal.
>>
>> Now if I run it through the jcraft zlib decoder it works (it is an
>> empty string but that is beside the point) in latest trunk it throws
>> an end of data exception. The problem is that the decode chunk ends
>> without a terminating bit in the stream and thus the EOF. According to
>> the deflate spec it is not required so I would consider this a bug on
>> the Java InflateInputStream.
>>
>>
>> I recoded the decoder and it seems to work in all my testcases where I
>> had zlib streams with and without the Z_STREAM_END set. The code is
>> below ...
>>
>>
>>
>> protected ByteArrayOutputStream decompress(InputStream in)
>> throws IOException, DataFormatException
>> {
>> ByteArrayOutputStream out = new ByteArrayOutputStream();
>> byte buf[] = new byte[1000];
>> Inflater inflater = new Inflater();
>> int read = in.read(buf);
>> if(read == 0)
>> {
>> return out;
>> }
>> inflater.setInput(buf,0,read);
>> byte res[] = new byte[1000];
>> while(true)
>> {
>> int resRead = inflater.inflate(res);
>> if(resRead !=0)
>> {
>> out.write(res,0,resRead);
>> continue;
>> }
>> if(inflater.finished() || inflater.needsDictionary() ||
>> (inflater.needsInput()&& in.available()==0))
>>
>> {
>> out.close();
>> return out;
>> }
>> if(inflater.needsInput())
>> {
>> read = in.read(buf);
>> inflater.setInput(buf,0,read);
>> }
>> }
>> }
>>
>>
>> and then
>> FlateFilter.decode(InputStream compressedData, OutputStream result,
>> COSDictionary options, int filterIndex )
>>
>> looks like
>>
>>
>> if (compressedData.available()> 0)
>> {
>> try
>> {
>> baos = decompress(compressedData);
>> }
>> if (predictor==-1 || predictor == 1 )
>> {
>> result.write(baos.toByteArray());
>> }
>> else
>> {
>> use the bytearrayoutput stream as before ...
>> }
>>
>>
>> Thoughts ?
>>
>>
>>
>> Dave Smith
>> Candata Ltd.
>> 416-493-9020x2413
>> Direct: 416-855-2413
>
>
>
> --
>
> Timo Boehme
> OntoChem GmbH
> H.-Damerow-Str. 4
> 06120 Halle/Saale
> T: +49 345 4780474
> F: +49 345 4780471
> timo.boe...@ontochem.com
>
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