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For non-encrypted files, determinstic ID generation uses file contents instead of timestamp and file name. At a small runtime cost, this enables generation of the same /ID if the same inputs are converted in the same way multiple times.
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fix-qdf was previously hard-coding the number of bytes for the f2 field of the xref stream entry. This addresses issue #37. Thanks aluebcke for reporting.
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As reported in issue #40, a call to CryptAcquireContext in SecureRandomDataProvider fails in a fresh windows install prior to any user keys being created in AppData\Roaming\Microsoft\Crypto\RSA. Thanks michalrames.
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QUtil.hh needs time.h to get time_t on some platforms. Thanks Peter Korsgaard <peter@korsgaard.com>
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There have been a few enhancements requested that only affect the qpdf command line tool and that should be relatively quick to implement. Work out the details and acknowledge these publicly in the TODO file.
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Pushing inherited objects to pages and getting all pages were both prone to stack overflow infinite loops if there were loops in the Pages dictionary. There is a general weakness in the code in that any part of the code that traverses the Pages structure would be prone to this and would have to implement its own loop detection. A more robust fix may provide some general method for handling the Pages structure, but it's probably not worth doing. Note: addition of *Internal2 private functions was done rather than changing signatures of existing methods to avoid breaking compatibility.
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Converting a password to an encryption key is supposed to copy up to a certain number of bytes from a digest. Make sure never to copy more than the size of the digest.
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When checking two objects preceding R while parsing, ensure that the objects are direct. This avoids stuff like 1 0 obj containing 1 0 R 0 R from causing an infinite loop in object resolution.
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Original reported here: https://bugs.launchpad.net/ubuntu/+source/qpdf/+bug/1397413 The PDF specification says that the /Type key for nodes in the pages dictionary (both /Page and /Pages) is required, but some PDF files omit them. Use the presence of other keys to determine the type of pages tree node this is if the type key is not found.
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The spec allows /Contents to be omitted for pages that are blank, but QPDFObjectHandle::getPageContents() was throwing an exception in this case.
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Without this, qpdf executables work only on Vista or newer. Fixes #35
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Used during creation of Windows releases
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This is faster than using qpdf --pages to do it.
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QPDFWriter was trying to make /Filter and /DecodeParms direct in all cases, but there are some cases where /DecodeParms may refer to a stream, which can't be direct. QPDFWriter doesn't actually need /DecodeParms to be direct in that case because it won't be able to filter the stream. Until we can handle this type of stream, just don't make /Filter and /DecodeParms direct if we can't filter the stream anyway. Fixes #34
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Fix problem: if the last object in the first part of a linearized file had an offset that was below 65536 by less than the size of the hint stream, the xref stream was invalid and the resulting file is not usable.
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This is a performance fix. The output is unchanged. Fixes #28.
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Add a method to get the current random data provider, and document and test the method for resetting it.
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Also remove some trivial, non-functional code.
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Add new RandomDataProvider object and implement existing random number generation in terms of that. This enables end users to supply their own random data providers.
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Fixes #27.
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If NO_GET_ENVIRONMENT is #defined at compile time on Windows, do not call GetEnvironmentVariable. QUtil::get_env will always return false. This option is not available through configure. This was added to support a specific user's requirements to avoid calling GetEnvironmentVariable from the Windows API. Nothing in qpdf outside the test coverage system in qtest relies on QUtil::get_env.
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In compare image tests, use the gs device tiff24nc instead of tiff12nc since the 4 bit per sample images created by tiff12nc could sometimes trigger a bug in tiffcmp. Fixes #20.