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Fixed spelling errors in previously published commits and update spelling dictionary
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Read and write support is implemented for /V=5 with /R=5 as well as /R=6. /R=5 is the deprecated encryption method used by Acrobat IX. /R=6 is the encryption method used by PDF 2.0 from ISO 32000-2.
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Test cases added in a future commit since they depend on /R=6 support.
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All version operations are now fully aware of extension levels.
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Allowing users to subclass InputSource and Pipeline to read and write from/to arbitrary sources provides the maximum flexibility for users who want to read and write from other than files or memory.
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3.0.rc1
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Move object parsing code from QPDF to QPDFObjectHandle and parameterize the parts of it that are specific to a QPDF object. Provide a version that can't handle indirect objects and that can be called on an arbitrary string. A side effect of this change is that the offset used when reporting invalid stream length has changed, but since the new value seems like a better value than the old one, the test suite has been updated rather than making the code backward compatible. This only effects the offset reported for invalid streams that lack /Length or have an invalid /Length key. Updated some test code and exmaples to use QPDFObjectHandle::parse. Supporting changes include adding a BufferInputSource constructor that takes a string.
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InputSource, FileInputSource, and BufferInputSource are now top-level classes instead of privately nested inside QPDF.
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This includes QPDF::copyForeignObject and supporting foreign objects as arguments to addPage*.
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QPDFObjectHandle::{new,is,assert}Reserved, QPDF::replaceReserved provide a mechanism to add objects to a PDF file when there are circular references. This is a prerequisite to copying objects from one PDF to another.
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This rework makes xref reconstruction run much faster and use much less memory.
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This makes it possible to store offsets that are larger than 2 GB in the trailer dictionary.
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Also updated pdf_from_scratch test driver to use the new factories, and made some cosmetic improvements and documentation updates for the emptyPDF() method.
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off_t is used internally only when needed to talk to standard libraries. This requires that the "long long" type be supported by the compiler.
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Significantly improve the code's use of off_t for file offsets, size_t for memory sizes, and integer types in cases where there has to be compatibility with external interfaces. Rework sections of the code that would have prevented qpdf from working on files larger than 2 (or maybe 4) GB in size.