/* * uemis.c * * UEMIS SDA file importer * AUTHOR: Dirk Hohndel - Copyright 2011 * * Licensed under the MIT license. */ #include #include #include #include #include #define __USE_XOPEN #include #include "dive.h" #include "uemis.h" /* * following code is based on code found in at base64.sourceforge.net/b64.c * AUTHOR: Bob Trower 08/04/01 * COPYRIGHT: Copyright (c) Trantor Standard Systems Inc., 2001 * NOTE: This source code may be used as you wish, subject to * the MIT license. */ /* * Translation Table to decode (created by Bob Trower) */ static const char cd64[]="|$$$}rstuvwxyz{$$$$$$$>?@ABCDEFGHIJKLMNOPQRSTUVW$$$$$$XYZ[\\]^_`abcdefghijklmnopq"; /* * decodeblock -- decode 4 '6-bit' characters into 3 8-bit binary bytes */ static void decodeblock( unsigned char in[4], unsigned char out[3] ) { out[ 0 ] = (unsigned char ) (in[0] << 2 | in[1] >> 4); out[ 1 ] = (unsigned char ) (in[1] << 4 | in[2] >> 2); out[ 2 ] = (unsigned char ) (((in[2] << 6) & 0xc0) | in[3]); } /* * decode a base64 encoded stream discarding padding, line breaks and noise */ static void decode( uint8_t *inbuf, uint8_t *outbuf, int inbuf_len ) { uint8_t in[4], out[3], v; int i,len,indx_in=0,indx_out=0; while (indx_in < inbuf_len) { for (len = 0, i = 0; i < 4 && (indx_in < inbuf_len); i++ ) { v = 0; while ((indx_in < inbuf_len) && v == 0) { v = inbuf[indx_in++]; v = ((v < 43 || v > 122) ? 0 : cd64[ v - 43 ]); if (v) v = ((v == '$') ? 0 : v - 61); } if (indx_in < inbuf_len) { len++; if (v) in[i] = (v - 1); } else in[i] = 0; } if( len ) { decodeblock( in, out ); for( i = 0; i < len - 1; i++ ) outbuf[indx_out++] = out[i]; } } } /* end code from Bob Trower */ /* * pressure_to_depth: In centibar. And when converting to * depth, I'm just going to always use saltwater, because I * think "true depth" is just stupid. From a diving standpoint, * "true depth" is pretty much completely pointless, unless * you're doing some kind of underwater surveying work. * * So I give water depths in "pressure depth", always assuming * salt water. So one atmosphere per 10m. */ static int pressure_to_depth(uint16_t value) { double atm, cm; atm = bar_to_atm(value / 100.0); cm = 100 * atm + 0.5; return (cm > 0) ? 10 * (long)cm : 0; } /* * convert the base64 data blog */ int uemis_convert_base64(char *base64, uint8_t **data) { int len,datalen; len = strlen(base64); datalen = (len/4 + 1)*3; if (datalen < 0x123+0x25) { /* less than header + 1 sample??? */ fprintf(stderr,"suspiciously short data block\n"); } *data = malloc(datalen); if (! *data) { datalen = 0; fprintf(stderr,"Out of memory\n"); goto bail; } decode(base64, *data, len); if (memcmp(*data,"Dive\01\00\00",7)) fprintf(stderr,"Missing Dive100 header\n"); bail: return datalen; } /* Create events from the flag bits; * These bits basically represent what is displayed on screen at sample time. * Many of these 'warnings' are way hyper-active and seriously clutter the * profile plot - so these are disabled by default */ void uemis_event(struct dive *dive, struct sample *sample, uemis_sample_t *u_sample) { uint8_t *flags = u_sample->flags; if (flags[1] & 0x01) add_event(dive, sample->time.seconds, 0, 0, 0, "Safety Stop Violation"); if (flags[1] & 0x08) add_event(dive, sample->time.seconds, 0, 0, 0, "Speed Alarm"); #if WANT_CRAZY_WARNINGS if (flags[1] & 0x06) /* both bits 1 and 2 are a warning */ add_event(dive, sample->time.seconds, 0, 0, 0, "Speed Warning"); if (flags[1] & 0x10) add_event(dive, sample->time.seconds, 0, 0, 0, "PO2 Green Warning"); #endif if (flags[1] & 0x20) add_event(dive, sample->time.seconds, 0, 0, 0, "PO2 Ascend Warning"); if (flags[1] & 0x40) add_event(dive, sample->time.seconds, 0, 0, 0, "PO2 Ascend Alarm"); /* flags[2] reflects the deco / time bar * flags[3] reflects more display details on deco and pO2 */ if (flags[4] & 0x01) add_event(dive, sample->time.seconds, 0, 0, 0, "Tank Pressure Info"); if (flags[4] & 0x04) add_event(dive, sample->time.seconds, 0, 0, 0, "RGT Warning"); if (flags[4] & 0x08) add_event(dive, sample->time.seconds, 0, 0, 0, "RGT Alert"); if (flags[4] & 0x40) add_event(dive, sample->time.seconds, 0, 0, 0, "Tank Change Suggested"); if (flags[4] & 0x80) add_event(dive, sample->time.seconds, 0, 0, 0, "Depth Limit Exceeded"); if (flags[5] & 0x01) add_event(dive, sample->time.seconds, 0, 0, 0, "Max Deco Time Warning"); if (flags[5] & 0x04) add_event(dive, sample->time.seconds, 0, 0, 0, "Dive Time Info"); if (flags[5] & 0x08) add_event(dive, sample->time.seconds, 0, 0, 0, "Dive Time Alert"); if (flags[5] & 0x10) add_event(dive, sample->time.seconds, 0, 0, 0, "Marker"); if (flags[6] & 0x02) add_event(dive, sample->time.seconds, 0, 0, 0, "No Tank Data"); if (flags[6] & 0x04) add_event(dive, sample->time.seconds, 0, 0, 0, "Low Battery Warning"); if (flags[6] & 0x08) add_event(dive, sample->time.seconds, 0, 0, 0, "Low Battery Alert"); /* flags[7] reflects the little on screen icons that remind of previous * warnings / alerts - not useful for events */ } /* * parse uemis base64 data blob into struct dive */ void uemis_parse_divelog_binary(char *base64, void *datap) { int datalen; int i; uint8_t *data; struct sample *sample; uemis_sample_t *u_sample; struct dive **divep = datap; struct dive *dive = *divep; int template, gasoffset; datalen = uemis_convert_base64(base64, &data); /* dive template in use: 0 = air 1 = nitrox (B) 2 = nitrox (B+D) 3 = nitrox (B+T+D) uemis cylinder data is insane - it stores seven tank settings in a block and the template tells us which of the four groups of tanks we need to look at */ gasoffset = template = *(uint8_t *)(data+115); if (template == 3) gasoffset = 4; if (template == 0) template = 1; for (i = 0; i < template; i++) { float volume = *(float *)(data+116+25*(gasoffset + i)) * 1000.0; /* uemis always assumes a working pressure of 202.6bar (!?!?) - I first thought * it was 3000psi, but testing against all my dives gets me that strange number. * Still, that's of course completely bogus and shows they don't get how * cylinders are named in non-metric parts of the world... * we store the incorrect working pressure to get the SAC calculations "close" * but the user will have to correct this manually */ dive->cylinder[i].type.size.mliter = volume; dive->cylinder[i].type.workingpressure.mbar = 202600; dive->cylinder[i].gasmix.o2.permille = *(uint8_t *)(data+120+25*(gasoffset + i)) * 10 + 0.5; dive->cylinder[i].gasmix.he.permille = 0; } /* first byte of divelog data is at offset 0x123 */ i = 0x123; u_sample = (uemis_sample_t *)(data + i); while ((i < datalen) && (u_sample->dive_time)) { /* it seems that a dive_time of 0 indicates the end of the valid readings */ /* the SDA usually records more samples after the end of the dive -- * we want to discard those, but not cut the dive short; sadly the dive * duration in the header is a) in minutes and b) up to 3 minutes short */ if (u_sample->dive_time > dive->duration.seconds + 180) break; sample = prepare_sample(divep); dive = *divep; /* prepare_sample might realloc the dive */ sample->time.seconds = u_sample->dive_time; sample->depth.mm = pressure_to_depth(u_sample->water_pressure); sample->temperature.mkelvin = (u_sample->dive_temperature * 100) + 273150; sample->cylinderindex = u_sample->active_tank; sample->cylinderpressure.mbar= u_sample->tank_pressure * 10; uemis_event(dive, sample, u_sample); finish_sample(dive); i += 0x25; u_sample++; } dive->duration.seconds = sample->time.seconds - 1; return; }