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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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6
png.h
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@@ -1150,8 +1150,8 @@ PNG_EXPORTA(12, png_structp, png_create_write_struct_2,
PNG_EXPORT(13, void, png_write_sig, (png_structrp png_ptr));
/* Write a PNG chunk - size, type, (optional) data, CRC. */
PNG_EXPORT(14, void, png_write_chunk, (png_structrp png_ptr, png_const_bytep
chunk_name, png_const_bytep data, size_t length));
PNG_EXPORT(14, void, png_write_chunk, (png_structrp png_ptr,
png_const_bytep chunk_name, png_const_voidp data, size_t length));
/* Write the start of a PNG chunk - length and chunk name. */
PNG_EXPORT(15, void, png_write_chunk_start, (png_structrp png_ptr,
@@ -1159,7 +1159,7 @@ PNG_EXPORT(15, void, png_write_chunk_start, (png_structrp png_ptr,
/* Write the data of a PNG chunk started with png_write_chunk_start(). */
PNG_EXPORT(16, void, png_write_chunk_data, (png_structrp png_ptr,
png_const_bytep data, size_t length));
png_const_voidp data, size_t length));
/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
PNG_EXPORT(17, void, png_write_chunk_end, (png_structrp png_ptr));