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We already mark and check the usecmap entry where it is loaded.
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We use pdf_mark_obj/pdf_unmark_obj to catch cycles when
traversing PDF structures. In some cases we were failing
to actually test the return code, making it pointless.
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The generation number is only needed for decryption, and is assumed
to be zero or irrelevant for all other uses.
Store the original object number and generation in the xref slot, so
that we can decrypt them even when the objects have been renumbered,
without needing to pass the original object number around through
the stream loading APIs.
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This has knock on effects in the store.
fix
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Omitting the unlisted UTF-8 and UTF-32 CMaps saves ~1M.
Omitting the unlisted other CMaps saves ~200k.
Define CJK_CMAPS=0 to skip all CMaps.
Define EXTRA_CMAPS=1 to include the various other CMaps.
Define UTF8_CMAPS=1 and UTF32_CMAPS to include the UTF-8 and UTF-32 CMaps.
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Currently, every PDF name is allocated in a pdf_obj structure, and
comparisons are done using strcmp. Given that we can predict most
of the PDF names we'll use in a given file, this seems wasteful.
The pdf_obj type is opaque outside the pdf-object.c file, so we can
abuse it slightly without anyone outside knowing.
We collect a sorted list of names used in PDF (resources/pdf/names.txt),
and we add a utility (namedump) that preprocesses this into 2 header
files.
The first (include/mupdf/pdf/pdf-names-table.h, included as part of
include/mupdf/pdf/object.h), defines a set of "PDF_NAME_xxxx"
entries. These are pdf_obj *'s that callers can use to mean "A PDF
object that means literal name 'xxxx'"
The second (source/pdf/pdf-name-impl.h) is a C array of names.
We therefore update the code so that rather than passing "xxxx" to
functions (such as pdf_dict_gets(...)) we now pass PDF_NAME_xxxx (to
pdf_dict_get(...)). This is a fairly natural (if widespread) change.
The pdf_dict_getp (and sibling) functions that take a path (e.g.
"foo/bar/baz") are therefore supplemented with equivalents that
take a list (pdf_dict_getl(... , PDF_NAME_foo, PDF_NAME_bar,
PDF_NAME_baz, NULL)).
The actual implementation of this relies on the fact that small
pointer values are never valid values. For a given pdf_obj *p,
if NULL < (intptr_t)p < PDF_NAME__LIMIT then p is a literal
entry in the name table.
This enables us to do fast pointer compares and to skip expensive
strcmps.
Also, bring "null", "true" and "false" into the same style as PDF names.
Rather than using full pdf_obj structures for null/true/false, use
special pointer values just above the PDF_NAME_ table. This saves
memory and makes comparisons easier.
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Purge several embedded contexts:
Remove embedded context in fz_output.
Remove embedded context in fz_stream.
Remove embedded context in fz_device.
Remove fz_rebind_stream (since it is no longer necessary).
Remove embedded context in svg_device.
Remove embedded context in XML parser.
Add ctx argument to fz_document functions.
Remove embedded context in fz_document.
Remove embedded context in pdf_document.
Remove embedded context in pdf_obj.
Make fz_page independent of fz_document in the interface.
We shouldn't need to pass the document to all functions handling a page.
If a page is tied to the source document, it's redundant; otherwise it's
just pointless.
Fix reference counting oddity in fz_new_image_from_pixmap.
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Rename fz_close to fz_drop_stream.
Rename fz_close_archive to fz_drop_archive.
Rename fz_close_output to fz_drop_output.
Rename fz_free_* to fz_drop_*.
Rename pdf_free_* to pdf_drop_*.
Rename xps_free_* to xps_drop_*.
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Fixes bug introduced in commit 1679c1e7a89ae62260fd84ce55c6bef376c6e6ba:
Optimize UniXXX CMap files.
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Increasing the existing data structure to 32-bit values would bloat the data
tables too much.
Simplify the data structure and use three separate range tables for lookups --
one with small 16-bit to 16-bit range lookups, one with 32-bit range lookups,
and a final one for one-to-many lookups.
This loses the range-to-table optimization we had before, but even with the
extra ranges this necessitates, the total size of the compiled binary CMap data
is smaller than if we were to extend the previous scheme to 32 bits.
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Some warnings we'd like to enable for MuPDF and still be able to
compile it with warnings as errors using MSVC (2008 to 2013):
* C4115: 'timeval' : named type definition in parentheses
* C4204: nonstandard extension used : non-constant aggregate initializer
* C4295: 'hex' : array is too small to include a terminating null character
* C4389: '==' : signed/unsigned mismatch
* C4702: unreachable code
* C4706: assignment within conditional expression
Also, globally disable C4701 which is frequently caused by MSVC not
being able to correctly figure out fz_try/fz_catch code flow.
And don't define isnan for VS2013 and later where that's no longer needed.
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Thanks to Makoto Fujiwara for spotting this.
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Correct the naming scheme for pdf_obj_xxx functions.
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For historical reasons lots of the code uses "xref" when talking about
a pdf document. Now pdf_xref is a separate type this has become
confusing, so replace 'xref' with 'doc' for clarity.
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