[Poppler-bugs] [Bug 95061] New: PDF hint table fails to load if PDFDoc is opened with stream start offset != 0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95061

            Bug ID: 95061
           Summary: PDF hint table fails to load if PDFDoc is opened with
                    stream start offset != 0
           Product: poppler
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
          Assignee: poppler-bugs at lists.freedesktop.org
          Reporter: seksfemfire at gmail.com

Created attachment 123139
  --> https://bugs.freedesktop.org/attachment.cgi?id=123139&action=edit
Respect parent stream start offset when creating substream

The problem is that hints.cc create a substream from the original stream given
to the PDFDoc class. The substream does not include the stream start offset in
the original stream.

To reproduce:
1. Create stream with startA != 0
2. Create PDFDoc with stream as output.
3. If PDF has hints tables it will output warnings:

Syntax Warning: Failed parsing hints table object
Syntax Warning: Failed to get object num from hint tables for page 1
Syntax Warning: Failed parsing page 1 using hint tables
Syntax Warning: Failed to get object num from hint tables for page 1
Syntax Warning: Failed parsing page 1 using hint tables
Syntax Warning: Failed to get object num from hint tables for page 1

The attached patch fixes the issue.

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