fix: add maximum nesting depth for PDF object parsing#66
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Limit the recursion depth in readObject() to prevent excessive resource consumption when parsing deeply nested PDF structures. Returns an error if parsing past the limit.
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Summary
Limit the recursion depth in readObject() to prevent excessive resource consumption when parsing deeply nested PDF structures. Returns an error if parsing past the limit (1000 objects).
This prevents stack overflow on recursively nested PDF objects.
Testing
Added read_test.go with go test coverage for object/dict/array nesting beyond the new limit.