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This silences the many warnings we get when building for x64
in windows.
This does not address any of the warnings we get in thirdparty
libraries - in particular harfbuzz. These look (at a quick
glance) harmless though.
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If FZ_LARGEFILE is defined when building, MuPDF uses 64bit offsets
for files; this allows us to open streams larger than 2Gig.
The downsides to this are that:
* The xref entries are larger.
* All PDF ints are held as 64bit things rather than 32bit things
(to cope with /Prev entries, hint stream offsets etc).
* All file positions are stored as 64bits rather than 32.
The implementation works by detecting FZ_LARGEFILE. Some #ifdeffery
in fitz/system.h sets fz_off_t to either int or int64_t as appropriate,
and sets defines for fz_fopen, fz_fseek, fz_ftell etc as required.
These call the fseeko64 etc functions on linux (and so define
_LARGEFILE64_SOURCE) and the explicit 64bit functions on windows.
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A few casts are required within the code, along with a few #ifdef
changes.
Some tweaks to curl are required too.
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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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Previously, the overhead for the HTTP requests and responses
was too high, e.g. pdfref17.pdf would result in almost 8000
separate HTTP requests (but with this patch about 30.
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Previously errors from curl_easy_perform() were never checked. This
caused mupdf to enter an eternal loop, repeatedly trying to get data
to parse from the remote host.
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Currently fz_streams have a 4K buffer within their header. The call
to read from a stream fills this buffer, resulting in more data being
pulled from any underlying stream than we might like. This causes
problems with the forthcoming 'leech' filter.
Here we simplify the fields available in the public stream header.
No specific buffer is given; simply the read and write pointers.
The underlying 'read' function is replaced by a 'next' function
that makes the next block of data available and returns the first
character of it (or EOF).
A caller to the 'next' function should supply the maximum number of
bytes that it knows it will need (possibly not now, but eventually).
This enables the underlying stream to efficiently decode just enough.
The underlying stream is free to return fewer, or a greater number
if it wants to.
The exact size of the 'block' of data returned will depend on the
filter in use and (possibly) the data therein.
Callers can get the currently available amount of data by calling
fz_available (but again should pass the maximum amount of data they know
they will need). The only time this will ever return 0 is if we have
hit EOF.
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Windows and X11. Allows files to be fetched and displayed
as they are downloaded both with and without linearization, using
hints if available.
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