diff options
Diffstat (limited to 'libqpdf/QPDF_encryption.cc')
| -rw-r--r-- | libqpdf/QPDF_encryption.cc | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/libqpdf/QPDF_encryption.cc b/libqpdf/QPDF_encryption.cc index 7e191a27..d559388b 100644 --- a/libqpdf/QPDF_encryption.cc +++ b/libqpdf/QPDF_encryption.cc @@ -472,6 +472,18 @@ QPDF::initializeEncryption() } if (this->cf_file != this->cf_stream) { + // The issue for qpdf is that it can't tell the difference + // between an embedded file stream and a regular stream. + // Search for a comment containing cf_file. To fix this, + // we need files with encrypted embedded files and + // non-encrypted native streams and vice versa. Also if + // it is possible for them to be encrypted in different + // ways, we should have some of those too. In cases where + // we can detect whether a stream is encrypted or not, we + // might want to try to detecet that automatically in + // defense of possible logic errors surrounding detection + // of embedded file streams, unless that's really clear + // from the specification. throw QPDFExc(qpdf_e_unsupported, this->file->getName(), "encryption dictionary", this->file->getLastOffset(), "This document has embedded files that are" @@ -649,7 +661,9 @@ QPDF::decryptStream(Pipeline*& pipeline, int objid, int generation, { // NOTE: We should should use cf_file if this is an // embedded file, but we can't yet detect embedded - // file streams as such. + // file streams as such. When fixing, search for all + // occurrences of cf_file to find a reference to this + // comment. method = this->cf_stream; } } |