Port VPM Decompression Algorithm to PHP and then to Dive Computer Post: 302635733

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The Lounge What is on Your Mind? Port VPM Decompression Algorithm to PHP and then to Dive Computer Post 302635733 by Neo on Sunday 6th of May 2012 04:46:11 AM

05-06-2012

Administrator

Guess I'll start first by porting these functions, one-at-a-time, from C to PHP:

Blue means "First Cut Done" in this thread/project (update each time a function is ported to PHP)

Code:

extern /* Subroutine */ int calc_barometric_pressure();
extern /* Subroutine */ int calc_deco_ceiling();
extern /* Subroutine */ int onset_of_impermeability();
extern /* Subroutine */ int radius_root_finder();
extern /* Subroutine */ int nuclear_regeneration(), clock_();
extern /* Subroutine */ int vpm_repetitive_algorithm();
extern /* Subroutine */ int gas_loadings_surface_interval();
extern /* Subroutine */ int critical_volume();	    ;
extern /* Subroutine */ int calc_crushing_pressure(), 
                            calc_surface_phase_volume_time(), 
                            decompression_stop();
extern /* Subroutine */ int calc_start_of_deco_zone();
extern /* Subroutine */ int calc_initial_allowable_gradient(), 
                            gas_loadings_ascent_descen();
extern /* Subroutine */ int gas_loadings_constant_depth();
extern /* Subroutine */ int vpm_altitude_dive_algorithm();
extern /* Subroutine */ int calc_max_actual_gradient(), 
                            projected_ascent();

extern /* Subroutine */ doublereal schreiner_equation__();
extern /* Subroutine */ doublereal haldane_equation__();

Quote:

WARNING: Breathing compressed gas underwater, whether with conventional open-circuit scuba or closed-circuit rebreathers, is a potentially dangerous activity that requires specialized training. Breathing gas mixtures other than air underwater and especially using rebreather technology underwater, are activities which require considerable specialized training and certification. No one should ever attempt these activities without professional training. The information and software related to scuba diving, decompression theory and software code in this forum is provided for informational purposes only; and this information does not constitute adequate or proper training!

Neo

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LEARN ABOUT MOJAVE

cc_md4

CC_MD5(3cc)							       LOCAL							       CC_MD5(3cc)

NAME

     CC_MD2_Init CC_MD2_Update CC_MD2_Final CC_MD2

     CC_MD4_Init CC_MD4_Update CC_MD4_Final CC_MD4

     CC_MD5_Init CC_MD5_Update CC_MD5_Final CC_MD5

     -- MD2, MD4, and MD5 hash functions

SYNOPSIS

     #include <CommonCrypto/CommonDigest.h>

     extern int
     CC_MD2_Init(CC_MD2_CTX *c);

     extern int
     CC_MD2_Update(CC_MD2_CTX *c, const void *data, CC_LONG len);

     extern int
     CC_MD2_Final(unsigned char *md, CC_MD2_CTX *c);

     extern unsigned char *
     CC_MD2(const void *data, CC_LONG len, unsigned char *md);

     extern int
     CC_MD4_Init(CC_MD4_CTX *c);

     extern int
     CC_MD4_Update(CC_MD4_CTX *c, const void *data, CC_LONG len);

     extern int
     CC_MD4_Final(unsigned char *md, CC_MD4_CTX *c);

     extern unsigned char *
     CC_MD4(const void *data, CC_LONG len, unsigned char *md);

     extern int
     CC_MD5_Init(CC_MD5_CTX *c);

     extern int
     CC_MD5_Update(CC_MD5_CTX *c, const void *data, CC_LONG len);

     extern int
     CC_MD5_Final(unsigned char *md, CC_MD5_CTX *c);

     extern unsigned char *
     CC_MD5(const void *data, CC_LONG len, unsigned char *md);

DESCRIPTION

     The following functions are used to produce an hash from data:

     CC_MD2_Init() initializes a CC_MD2_CTX structure.

     CC_MD2_Update() can be called repeatedly with chunks of the message to be hashed (len bytes at data).

     CC_MD2_Final() places the MD2 message digest in md, which must have space for CC_MD2_DIGEST_LENGTH == 16 bytes of output, and erases the
     CC_MD2_CTX.

     CC_MD2() computes the MD2 message digest of the len bytes at data and places it in md (which must have space for CC_MD2_DIGEST_LENGTH == 16
     bytes of output). It returns the md pointer.

     CC_MD4_Init(), CC_MD4_Update(), CC_MD4_Final(), CC_MD4(), CC_MD5_Init(), CC_MD5_Update(), CC_MD5_Final(), and CC_MD5() are analogous using an
     CC_MD4_CTX and CC_MD5_CTX structure.

NOTE

     MD2, MD4, and MD5 are recommended only for compatibility with existing applications. In new applications, SHA-256(or greater) should be pre-
     ferred.

RETURN VALUES

     All routines return 1 except for the one-shot routines ( CC_MD2() , etc.), which return the pointer passed in via the md parameter.

CONFORMING TO

     RFC 1319, RFC 1320, RFC 1321

SEE ALSO

     CC_crypto(3cc), CC_SHA(3cc), CCHmac(3cc), CCCryptor(3cc)

HISTORY

     These functions are available in OS X 10.4 and later.

     These functions provide similar functionality to the routines found in OpenSSL 0.9.6 and may use the same implementation.

BSD
								   April 5, 2007							       BSD