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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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When we return the padding byte in an fz_concat stream, ensure that
we remember to increment rp to point just past in. If not, then we'll
read 2 whitespace chars out. This is fine unless we try and
fz_unread_byte the first one, when we'll leave rp pointing to
an out of buffer address.
Credit to Malc for the bisecting/debugging that got me to the fix.
Many thanks.
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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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If opening a filter in pdf_open_crypt throws, the stream is closed in
the used fz_open_* method and thus mustn't be closed again.
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