[IMAGING-174] Support non-8BIM signatures in Photoshop segments

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Format: JPEG
• Assignee: Unassigned
• Reporter: Arjohn Kampman
• Created: 19/Oct/15 14:35
• Updated: 19/Oct/15 14:38

Description

The code in IptcParser.parseAllBlocks(...) requires that all blocks have an "8BIM" signature. However, we're frequently finding jpeg files that have "PHUT" signatures mixed in. Some sites also report "AgHg" and "DCSR" signatures, for example: http://dev.exiv2.org/issues/800. Although the signature is not what the code expects, the block's data layout is still the same as for 8BIM. Please consider either parsing such blocks, or at least skip them with a warning. Currently, the code throws an exception which prevents us from extracting any of the other metadata. I'm attaching a sample image from the Enron Corpus that has two of these PHUT resource blocks.