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Previously, signature verification worked only for file-based documents
and the file path had to be passed into the verification function.
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This change achieves two goals. It allows signing to be performed even
when the document is obtained other than from a disk file. It also
reestablishes to a working state signing of file-based documents, a feature
that was broken due to complete_signatures being called after certain
tables, avaialble via the output options object, had been destroyed.
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This provides a way for some output streams to also be read, a feature
needed for the sake of document signing. Currently this is supported only
for file output.
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Once a stream has thrown an exception or reached EOF,
don't allow further reading.
The EOF flag is reset when fz_seek is invoked.
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We need both RC4 and AES encryption. RC4 is a straight reversable
stream, and our AES library knows how to encrypt as well as decrypt,
so it's "just" a matter of calling them correctly.
We therefore expose a generic "encrypt this data" routine (and a
matching "how long will the data be once encrypted" routine) within
pdf-crypt.c.
We then extend our our PDF object output routines to call these.
This is enough to get encrypted data preserved over calls to mutool
clean. Unfortunately the created files aren't readable, due to 2
further problems, also fixed here.
Firstly, mutool clean does not preserve the Encrypt entry in the
trailer. This is a simple fix.
Secondly, we are required NOT to encrypt the Encrypt entry. This
requires us to spot the crypt entry and to special case it.
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This is true because they are now limited below PDF_MAX_OBJECT_NUMBER.
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This ensures that:
* xref tables with objects pointers do not grow out of bounds.
* other readers, e.g. Adobe Acrobat can parse PDFs written by mupdf.
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This needs adding a fz_xml_doc type to hold the pool.
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This goes well with the 'mutool clean -d' decompression option to debug
content streams, without doing the sanitize optimization pass.
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Future proof the API for the Year 2038 problem.
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Also clarify that a copy of author/contents is returned, and that
the caller must free them.
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Create a PDF 'text string' type string from a UTF-8 input string.
If the input is plain ASCII, keep it as is, otherwise re-encode it
as UTF-16BE.
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Also wrap their contents in q/Q, so they can't screw up the
rest of the stream.
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Use android logging for throw/warn like we do with OutputDebugString
on windows.
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Currently, our API uses static inlines for fz_lock and
fz_unlock, the definitions for which depend on whether
we build NDEBUG or not. This isn't ideal as it causes
problems when people link a release binary with a debug
lib (or vice versa).
We really want to continue to use static inlines for the
locking functions as used from MuPDF, as we hit them
hard in the keep/drop functions.
We therefore remove fz_lock/fz_unlock from the public API
entirely. Accordingly, we move the fz_lock/fz_unlock
static inlines into fitz-imp.h (an internal header),
together with the fz_keep_.../fz_drop_... functions.
We then have public fz_lock/fz_unlock functions for any
external callers to use that are free of compilications.
At the same time, to avoid another indirection, we change
from holding the locking functions as a pointer to a
struct to a struct itself.
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TODO: Implement visual to logical reordering on the fly when building
the structured text line.
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So it can be used in the filter pdf_processor too.
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Closing flushes output and may throw exceptions.
Dropping frees the state and never throws exceptions.
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Don't mess with conditional compilation with LARGEFILE -- always expose
64-bit file offsets in our public API.
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Michael has found a crash when scrolling quickly through pages
with gsview. 2 Threads are redrawing at the same time from a
display list. The problem comes when both threads happen to be
trying to draw the same tile from the cache at the same time.
The current code alters the ->{x,y} values of the pixmap from
the cache as it tiles. If 2 threads are using the same tile
at the same time, this causes a race condition which can upset
the clipping calculations and we can access out of range.
The solution is to make a new 'wrapper' fz_pixmap around the
same data, and to alter the x/y values there instead.
We therefore introduce a (hopefully generally useful) function
fz_new_pixmap_from_pixmap, and use that.
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This is needed so that we can have bgr formatting with
something other than the default sRGB
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The 'producing spots' case is poorly tested, but I believe we
should be keeping the spot information internally, rather than
NULLing it out.
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First, we add an fz_page_overprint function to detect if a
page uses overprint. Only PDF implements this currently (other
formats all return false). PDF looks for '/OP true' in any
ExtGState entry.
We make Mutool check this. If it finds it, and spot rendering
is not completely disabled, then it ensures that the separation
object passed to the pixmap into which we draw is non NULL. This
causes the draw device to do overprint simulation.
We ensure that mutool draw defaults to having the spot rendering
mode default to simulation in builds that support it.
Finally, we ensure that if an output intent is set by the document,
and spot rendering is not completely disabled, then we ensure the
seps object is non NULL so that we render to a group in the
specified output intent, and THEN convert down to the required
colorspace for the output.
This should make us match acrobats behaviour.
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This is a first cut to get us to demo-ability. There will
likely be a few changes as we do a bit more testing with different
scenarios with Gray, RGB, CMYK combos of destination, proof and
output intent ICC profiles.
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Fixes some issues in Altona test file.
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Adjust the decode array to allow for the fact that the default
decode is done by the ICC code.
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The proof conversion should only be done after we
have done all our drawing in the separations
group. Fixes issue in page 7 of Altona test.
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Special care is required when the DeviceN color space has
cyan, magenta, yellow or black.
For example, even if we support separations in the destination, if
the color space has CMY or K as one of its colorants and we are
drawing to an RGB or Gray pixmap we will want to do the tint transform.
Also if the pixmap has no seps memember present, we support the
separations if the destination is CMYK and the DeviceN colorspace
has no "Spot" (non-CMYK) colorants.
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This gives us a friendlier interface to zlib.
Simplifies PNG output and PCLM output code.
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