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compression code unification

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Unify the compression code so that inflate calls are localized to a common
routine.  Ground work for filter selection support.  Minor API changes to use
void* not byte* for data parameters.  Unification of some of the compression
code with the decompression code; IDAT_size replaces IDAT_read_size and
zbuffer_size, IDAT reading and writing is no longer controlled by the size of
the compression buffer.

Signed-off-by: John Bowler <jbowler@acm.org>
This commit is contained in:
John Bowler
2015-11-30 13:39:49 -08:00
parent 6bbc74d880
commit 4792c8a751
15 changed files with 609 additions and 537 deletions
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2
pngwrite.c
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@@ -523,7 +523,7 @@ png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
/* Set the zlib control values to defaults; they can be overridden by the
* application after the struct has been created.
*/
png_ptr->zbuffer_size = PNG_ZBUF_SIZE;
png_ptr->IDAT_size = PNG_ZBUF_SIZE;
/* The 'zlib_strategy' setting is irrelevant because png_default_claim in
* pngwutil.c defaults it according to whether or not filters will be