Add public compile definition for zlib-ng API

[nmoinvaz]

This is so that other projects that use CMake and link against the zlib project can easily determine whether or not to include "zlib-ng.h" or "zlib.h". They would do this in order to support zlib compatibility.I am open to the different naming.

Any consumer project that uses target_link_libraries(${PROJECT_NAME} zlibstatic) (zlib or zlibstatic) can use:

#ifdef ZLIBNG_NATIVE_API
#  include "zlib-ng.h"
#  define ZLIB_PREFIX(x) zng_ ## x
   typedef zng_stream zlib_stream;
#else
#  include "zlib.h"
#  define ZLIB_PREFIX(x) x
   typedef z_stream zlib_stream;
#endif

They would do this in order to also support zlib compatibility. https://github.com/zlib-ng/minizip-ng/blob/47b8449fec2c7a575a506ecbe6399ad0603b5992/mz_strm_zlib.c#L16

[codecov]

Codecov Report

Merging #1292 (289a2b1) into develop (413bbfa) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1292   +/-   ##
========================================
  Coverage    86.57%   86.58%           
========================================
  Files          124      124           
  Lines        10533    10537    +4     
  Branches      2622     2624    +2     
========================================
+ Hits          9119     9123    +4     
+ Misses        1059     1058    -1     
- Partials       355      356    +1     

Flag	Coverage Δ
macos_clang	33.33% <ø> (ø)
macos_gcc	73.80% <ø> (-0.02%)	⬇️
ubuntu_clang	85.26% <ø> (-0.16%)	⬇️
ubuntu_clang_debug	85.04% <ø> (-0.02%)	⬇️
ubuntu_clang_inflate_allow_invalid_dist	85.11% <ø> (-0.03%)	⬇️
ubuntu_clang_inflate_strict	85.35% <ø> (-0.03%)	⬇️
ubuntu_clang_mmap	85.54% <ø> (-0.03%)	⬇️
ubuntu_clang_pigz	40.21% <ø> (-0.04%)	⬇️
ubuntu_clang_pigz_no_optim	41.66% <ø> (-0.05%)	⬇️
ubuntu_clang_pigz_no_threads	39.80% <ø> (-0.04%)	⬇️
ubuntu_clang_reduced_mem	85.65% <ø> (-0.16%)	⬇️
ubuntu_gcc	75.65% <ø> (-0.02%)	⬇️
ubuntu_gcc_aarch64	77.50% <ø> (-0.03%)	⬇️
ubuntu_gcc_aarch64_compat_no_opt	75.62% <ø> (-0.03%)	⬇️
ubuntu_gcc_aarch64_no_acle	76.30% <ø> (-0.03%)	⬇️
ubuntu_gcc_aarch64_no_neon	76.20% <ø> (-0.03%)	⬇️
ubuntu_gcc_armhf	77.52% <ø> (-0.03%)	⬇️
ubuntu_gcc_armhf_compat_no_opt	75.60% <ø> (-0.03%)	⬇️
ubuntu_gcc_armhf_no_acle	77.52% <ø> (-0.03%)	⬇️
ubuntu_gcc_armhf_no_neon	77.30% <ø> (-0.03%)	⬇️
ubuntu_gcc_armsf	77.17% <ø> (-0.03%)	⬇️
ubuntu_gcc_armsf_compat_no_opt	75.27% <ø> (-0.03%)	⬇️
ubuntu_gcc_benchmark	73.86% <ø> (-0.22%)	⬇️
ubuntu_gcc_compat_no_opt	76.83% <ø> (-0.03%)	⬇️
ubuntu_gcc_compat_sprefix	73.98% <ø> (-0.18%)	⬇️
ubuntu_gcc_m32	73.60% <ø> (-0.02%)	⬇️
ubuntu_gcc_mingw_i686	0.00% <ø> (ø)
ubuntu_gcc_mingw_x86_64	0.00% <ø> (ø)
ubuntu_gcc_no_avx2	74.80% <ø> (-0.02%)	⬇️
ubuntu_gcc_no_ctz	74.86% <ø> (-0.03%)	⬇️
ubuntu_gcc_no_ctzll	74.89% <ø> (-0.03%)	⬇️
ubuntu_gcc_no_pclmulqdq	74.06% <ø> (-0.02%)	⬇️
ubuntu_gcc_no_sse2	75.01% <ø> (+0.03%)	⬆️
ubuntu_gcc_no_sse4	74.70% <ø> (+0.03%)	⬆️
ubuntu_gcc_o1	74.33% <ø> (-0.07%)	⬇️
ubuntu_gcc_osb	∅ <ø> (∅)
ubuntu_gcc_pigz	38.14% <ø> (+0.03%)	⬆️
ubuntu_gcc_pigz_aarch64	39.22% <ø> (-0.06%)	⬇️
ubuntu_gcc_ppc	73.66% <ø> (-0.03%)	⬇️
ubuntu_gcc_ppc64	74.43% <ø> (-0.03%)	⬇️
ubuntu_gcc_ppc64le	74.41% <ø> (-0.03%)	⬇️
ubuntu_gcc_ppc_no_power8	74.61% <ø> (-0.03%)	⬇️
ubuntu_gcc_s390x	74.82% <ø> (-0.03%)	⬇️
ubuntu_gcc_s390x_dfltcc	72.21% <ø> (-0.03%)	⬇️
ubuntu_gcc_s390x_dfltcc_compat	73.75% <ø> (-0.02%)	⬇️
ubuntu_gcc_s390x_no_crc32	74.60% <ø> (-0.03%)	⬇️
ubuntu_gcc_sparc64	74.71% <ø> (-0.03%)	⬇️
ubuntu_gcc_sprefix	73.64% <ø> (-0.17%)	⬇️
win64_gcc	73.84% <ø> (-0.03%)	⬇️
win64_gcc_compat_no_opt	74.35% <ø> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
inflate.c	93.58% <0.00%> (-0.10%)	⬇️
deflate.c	83.20% <0.00%> (-0.09%)	⬇️
gzlib.c	71.10% <0.00%> (ø)
arch/arm/chunkset_neon.c	100.00% <0.00%> (ø)
arch/power/chunkset_power8.c	100.00% <0.00%> (ø)
arch/x86/adler32_sse42.c	100.00% <0.00%> (+1.53%)	⬆️
adler32_p.h	100.00% <0.00%> (+3.57%)	⬆️

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[nmoinvaz]

@Dead2 any thoughts on the #define naming?

[Dead2]

ZLIBNG_MODERN_API or ZLIBNG_NATIVE_API would work.

[nmoinvaz]

I perfer ZLIBNG_NATIVE_API so I have changed it.