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Simplified API: write-to-memory, overflow handling

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This implements an API and provides a number of assist macros to allow an
application which uses the simplified API write to bypass stdio and write
directly to memory.

It also includes some warnings (png.h) and some check code to detect *possible*
overflow in the ROW_STRIDE and simplified image SIZE macros.  This disallows
image width/height/format that *might* overflow.  A quiet API change that limits
in-memory image size (uncompressed) to less that 4GByte and image row size
(stride) to less than 2GByte.

Signed-off-by: John Bowler <jbowler@acm.org>
This commit is contained in:
John Bowler
2016-01-18 09:53:38 -08:00
parent 777dbf46dc
commit 175a126a1a
7 changed files with 391 additions and 63 deletions
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5
scripts/pnglibconf.dfa
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@@ -873,9 +873,12 @@ option SIMPLIFIED_READ_BGR enables FORMAT_BGR,
# Write:
option SIMPLIFIED_WRITE,
requires WRITE STDIO, SETJMP, WRITE_SWAP, WRITE_PACK,
requires WRITE, SETJMP, WRITE_SWAP, WRITE_PACK,
WRITE_tRNS, WRITE_gAMA, WRITE_sRGB, WRITE_cHRM
# 1.6.22: allow simplified write without stdio support:
option SIMPLIFIED_WRITE_STDIO requires SIMPLIFIED_WRITE STDIO
option SIMPLIFIED_WRITE_AFIRST enables FORMAT_AFIRST,
requires SIMPLIFIED_WRITE WRITE_SWAP_ALPHA