102 lines
4.2 KiB
C
102 lines
4.2 KiB
C
/****************************************************************
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* *
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* Copyright 2008, 2010 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#ifndef GTM_ZLIB_H_INCLUDED
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#define GTM_ZLIB_H_INCLUDED
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#if (defined(__osf__) && defined(__alpha)) || (defined(__MVS__))
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/* For some reason, zconf.h (included by zlib.h) on Tru64 seems to undefine const if STDC is not defined.
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* The GT.M build time options currently dont define __STDC__ on Tru64 (which is what leads zconf.h to define STDC)
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* so define STDC temporarily. In any case check if it is defined and only if not defined, do the overriding define.
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*/
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# if (!defined(STDC))
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# define GTM_ZLIB_STDC_DEFINE
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# define STDC
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# endif
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#endif
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#include <zlib.h>
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#if (defined(__osf__) && defined(__alpha)) || (defined(__MVS__))
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/* Undefine STDC in case it was defined just above */
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# if (defined(GTM_ZLIB_STDC_DEFINE))
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# undef STDC
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# endif
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#endif
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typedef int (*zlib_cmp_func_t)(Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen, int level);
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typedef int (*zlib_uncmp_func_t)(Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen);
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typedef uLong (*zlib_cmpbound_func_t)(uLong sourceLen);
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GBLREF zlib_cmp_func_t zlib_compress_fnptr;
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GBLREF zlib_uncmp_func_t zlib_uncompress_fnptr;
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/* The standard shared library suffix for HPUX on HPPA is .sl.
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* On HPUX/IA64, the standard suffix was changed to .so (to match other Unixes) but for
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* the sake of compatibility, they still accept (and look for) .sl if .so is not present.
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* Nevertheless, we use the standard suffix on all platforms.
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*/
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#if (defined(__hpux) && defined(__hppa))
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# define ZLIB_LIBNAME "libz.sl"
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#else
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# define ZLIB_LIBNAME "libz.so"
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#endif
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#define ZLIB_LIBFLAGS (RTLD_NOW) /* RTLD_NOW - resolve immediately so we know errors sooner than later */
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#define ZLIB_CMP_FNAME "compress2"
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#define ZLIB_UNCMP_FNAME "uncompress"
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#define ZLIB_NUM_DLSYMS 2 /* number of function names that we need to dlsym (compress2 and uncompress) */
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GBLREF int4 gtm_zlib_cmp_level; /* zlib compression level specified at process startup */
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GBLREF int4 repl_zlib_cmp_level; /* zlib compression level currently in use in replication pipe */
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#define ZLIB_CMPLVL_MIN 0
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#define ZLIB_CMPLVL_MAX 9 /* although currently known max zlib compression level is 9, it could be higher in
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* future versions of zlib so we dont do any edit checks on this value inside of GT.M */
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#define ZLIB_CMPLVL_NONE ZLIB_CMPLVL_MIN
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#define GTM_CMPLVL_OUT_OF_RANGE(x) (ZLIB_CMPLVL_MIN > x)
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void gtm_zlib_init(void);
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/* Macros for zlib compress2 and uncompress function calls. Since 'malloc' or 'free' inside zlib library does NOT go
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* through gtm_malloc or gtm_free respectively, defer signals (MUPIP STOP for instance) until the corresponding zlib
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* call is completed so as to avoid deadlocks involving nested 'malloc' or 'free' each waiting for the other's
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* completion
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*/
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#define ZLIB_COMPRESS(CMPBUFF_PTR, CMPLEN, UNCMPBUFF_PTR, UNCMPLEN, ZLIB_CMP_LEVEL, RC) \
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{ \
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GBLREF zlib_cmp_func_t zlib_compress_fnptr; \
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\
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DEFER_INTERRUPTS(INTRPT_IN_ZLIB_CMP_UNCMP); \
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assert(0 < (signed)(CMPLEN)); \
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assert(NULL != zlib_compress_fnptr); \
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RC = (*zlib_compress_fnptr)(((Bytef *)(CMPBUFF_PTR)), (uLongf *)&(CMPLEN), (const Bytef *)(UNCMPBUFF_PTR), \
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(uLong)(UNCMPLEN), ZLIB_CMP_LEVEL); \
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ENABLE_INTERRUPTS(INTRPT_IN_ZLIB_CMP_UNCMP); \
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}
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#define ZLIB_UNCOMPRESS(UNCMPBUFF_PTR, UNCMPLEN, CMPBUFF_PTR, CMPLEN, RC) \
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{ \
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GBLREF zlib_uncmp_func_t zlib_uncompress_fnptr; \
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\
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DEFER_INTERRUPTS(INTRPT_IN_ZLIB_CMP_UNCMP); \
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assert(0 < (signed)(UNCMPLEN)); \
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assert(NULL != zlib_uncompress_fnptr); \
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RC = (*zlib_uncompress_fnptr)(((Bytef *)(UNCMPBUFF_PTR)), (uLongf *)&(UNCMPLEN), (const Bytef *)(CMPBUFF_PTR), \
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(uLong)(CMPLEN)); \
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ENABLE_INTERRUPTS(INTRPT_IN_ZLIB_CMP_UNCMP); \
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}
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#endif
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