git.zerfleddert.de Git - proxmark3-svn/blob - client/graph.c

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
   3 //
   4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   5 // at your option, any later version. See the LICENSE.txt file for the text of
   6 // the license.
   7 //-----------------------------------------------------------------------------
   8 // Graph utilities
   9 //-----------------------------------------------------------------------------
  10
  11 #include <stdio.h>
  12 #include <stdbool.h>
  13 #include <string.h>
  14 #include "ui.h"
  15 #include "graph.h"
  16 #include "lfdemod.h"
  17
  18 int GraphBuffer[MAX_GRAPH_TRACE_LEN];
  19 int GraphTraceLen;
  20 /* write a manchester bit to the graph */
  21 void AppendGraph(int redraw, int clock, int bit)
  22 {
  23         int i;
  24         //set first half the clock bit (all 1's or 0's for a 0 or 1 bit)
  25         for (i = 0; i < (int)(clock / 2); ++i)
  26                 GraphBuffer[GraphTraceLen++] = bit ;
  27         //set second half of the clock bit (all 0's or 1's for a 0 or 1 bit)
  28         for (i = (int)(clock / 2); i < clock; ++i)
  29                 GraphBuffer[GraphTraceLen++] = bit ^ 1;
  30
  31         if (redraw)
  32                 RepaintGraphWindow();
  33 }
  34
  35 // clear out our graph window
  36 int ClearGraph(int redraw)
  37 {
  38         int gtl = GraphTraceLen;
  39         memset(GraphBuffer, 0x00, GraphTraceLen);
  40         GraphTraceLen = 0;
  41         if (redraw)
  42                 RepaintGraphWindow();
  43         return gtl;
  44 }
  45 // option '1' to save GraphBuffer any other to restore
  46 void save_restoreGB(uint8_t saveOpt)
  47 {
  48         static int SavedGB[MAX_GRAPH_TRACE_LEN];
  49         static int SavedGBlen;
  50         static bool GB_Saved = false;
  51
  52         if (saveOpt==1) { //save
  53                 memcpy(SavedGB, GraphBuffer, sizeof(GraphBuffer));
  54                 SavedGBlen = GraphTraceLen;
  55                 GB_Saved=true;
  56         } else if (GB_Saved){ //restore
  57                 memcpy(GraphBuffer, SavedGB, sizeof(GraphBuffer));
  58                 GraphTraceLen = SavedGBlen;
  59                 RepaintGraphWindow();
  60         }
  61         return;
  62 }
  63
  64 // DETECT CLOCK NOW IN LFDEMOD.C
  65
  66 void setGraphBuf(uint8_t *buff, size_t size)
  67 {
  68         if ( buff == NULL ) return;
  69
  70         ClearGraph(0);
  71
  72         if ( size > MAX_GRAPH_TRACE_LEN )
  73                 size = MAX_GRAPH_TRACE_LEN;
  74
  75         for (uint16_t i = 0; i < size; ++i)
  76                 GraphBuffer[i] = buff[i] - 128;
  77
  78         GraphTraceLen = size;
  79         RepaintGraphWindow();
  80         return;
  81 }
  82 size_t getFromGraphBuf(uint8_t *buff)
  83 {
  84         if (buff == NULL ) return 0;
  85         uint32_t i;
  86         for (i=0; i < GraphTraceLen; ++i){
  87                 if (GraphBuffer[i] > 127) GraphBuffer[i] = 127; //trim
  88                 if (GraphBuffer[i] < -127) GraphBuffer[i] = -127; //trim
  89                 buff[i] = (uint8_t)(GraphBuffer[i]+128);
  90         }
  91         return i;
  92 }
  93
  94 // A simple test to see if there is any data inside Graphbuffer.
  95 bool HasGraphData(){
  96
  97         if ( GraphTraceLen <= 0) {
  98                 PrintAndLog("No data available, try reading something first");
  99                 return false;
 100         }
 101         return true;
 102 }
 103
 104 // Detect high and lows in Grapbuffer.
 105 // Only loops the first 256 values.
 106 void DetectHighLowInGraph(int *high, int *low, bool addFuzz) {
 107
 108         uint8_t loopMax = 255;
 109         if ( loopMax > GraphTraceLen)
 110                 loopMax = GraphTraceLen;
 111
 112         for (uint8_t i = 0; i < loopMax; ++i) {
 113                 if (GraphBuffer[i] > *high)
 114                         *high = GraphBuffer[i];
 115                 else if (GraphBuffer[i] < *low)
 116                         *low = GraphBuffer[i];
 117         }
 118
 119         //12% fuzz in case highs and lows aren't clipped
 120         if (addFuzz) {
 121                 *high = (int)(*high * .88);
 122                 *low  = (int)(*low  * .88);
 123         }
 124 }
 125
 126 // Get or auto-detect ask clock rate
 127 int GetAskClock(const char str[], bool printAns, bool verbose)
 128 {
 129         int clock;
 130         sscanf(str, "%i", &clock);
 131         if (!strcmp(str, ""))
 132                 clock = 0;
 133
 134         if (clock != 0) return clock;
 135
 136         // Auto-detect clock
 137         uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
 138         size_t size = getFromGraphBuf(grph);
 139         if (size == 0) {
 140                 if (verbose)
 141                         PrintAndLog("Failed to copy from graphbuffer");
 142                 return -1;
 143         }
 144         bool st = DetectST(grph, &size, &clock);
 145         int start = 0;
 146         if (st == false)
 147                 start = DetectASKClock(grph, size, &clock, 20);
 148
 149         // Only print this message if we're not looping something
 150         if (printAns)
 151                 PrintAndLog("Auto-detected clock rate: %d, Best Starting Position: %d", clock, start);
 152         return clock;
 153 }
 154
 155 uint8_t GetPskCarrier(const char str[], bool printAns, bool verbose)
 156 {
 157         uint8_t carrier = 0;
 158         uint8_t grph[MAX_GRAPH_TRACE_LEN] = {0};
 159         size_t size = getFromGraphBuf(grph);
 160         if ( size == 0 ) {
 161                 if (verbose)
 162                         PrintAndLog("Failed to copy from graphbuffer");
 163                 return 0;
 164         }
 165         carrier = countFC(grph, size, 0);
 166         // Only print this message if we're not looping something
 167         if (printAns)
 168                 PrintAndLog("Auto-detected PSK carrier rate: %d", carrier);
 169
 170         return carrier;
 171 }
 172
 173 int GetPskClock(const char str[], bool printAns, bool verbose)
 174 {
 175         int clock;
 176         sscanf(str, "%i", &clock);
 177         if (!strcmp(str, ""))
 178                 clock = 0;
 179
 180         if (clock != 0) return clock;
 181         // Auto-detect clock
 182         uint8_t grph[MAX_GRAPH_TRACE_LEN] = {0};
 183         size_t size = getFromGraphBuf(grph);
 184         if ( size == 0 ) {
 185                 if (verbose) PrintAndLog("Failed to copy from graphbuffer");
 186                 return -1;
 187         }
 188         clock = DetectPSKClock(grph, size, 0);
 189         // Only print this message if we're not looping something
 190         if (printAns) PrintAndLog("Auto-detected clock rate: %d", clock);
 191         return clock;
 192 }
 193
 194 uint8_t GetNrzClock(const char str[], bool printAns, bool verbose)
 195 {
 196         int clock;
 197         sscanf(str, "%i", &clock);
 198         if (!strcmp(str, ""))
 199                 clock = 0;
 200
 201         if (clock != 0)
 202                 return clock;
 203         // Auto-detect clock
 204         uint8_t grph[MAX_GRAPH_TRACE_LEN] = {0};
 205         size_t size = getFromGraphBuf(grph);
 206         if ( size == 0 ) {
 207                 if (verbose)
 208                         PrintAndLog("Failed to copy from graphbuffer");
 209                 return -1;
 210         }
 211         clock = DetectNRZClock(grph, size, 0);
 212         // Only print this message if we're not looping something
 213         if (printAns)
 214                 PrintAndLog("Auto-detected clock rate: %d", clock);
 215
 216         return clock;
 217 }
 218 //by marshmellow
 219 //attempt to detect the field clock and bit clock for FSK
 220 uint8_t GetFskClock(const char str[], bool printAns, bool verbose)
 221 {
 222         int clock;
 223         sscanf(str, "%i", &clock);
 224         if (!strcmp(str, ""))
 225                 clock = 0;
 226         if (clock != 0) return (uint8_t)clock;
 227
 228
 229         uint8_t fc1=0, fc2=0, rf1=0;
 230         uint8_t ans = fskClocks(&fc1, &fc2, &rf1, verbose);
 231         if (ans == 0) return 0;
 232         if ((fc1==10 && fc2==8) || (fc1==8 && fc2==5)){
 233                 if (printAns) PrintAndLog("Detected Field Clocks: FC/%d, FC/%d - Bit Clock: RF/%d", fc1, fc2, rf1);
 234                 return rf1;
 235         }
 236         if (verbose){
 237                 PrintAndLog("DEBUG: unknown fsk field clock detected");
 238                 PrintAndLog("Detected Field Clocks: FC/%d, FC/%d - Bit Clock: RF/%d", fc1, fc2, rf1);
 239         }
 240         return 0;
 241 }
 242 uint8_t fskClocks(uint8_t *fc1, uint8_t *fc2, uint8_t *rf1, bool verbose)
 243 {
 244         uint8_t BitStream[MAX_GRAPH_TRACE_LEN] = {0};
 245         size_t size = getFromGraphBuf(BitStream);
 246         if (size == 0) return 0;
 247         uint16_t ans = countFC(BitStream, size, 1);
 248         if (ans == 0) {
 249                 if (verbose || g_debugMode) PrintAndLog("DEBUG: No data found");
 250                 return 0;
 251         }
 252         *fc1 = (ans >> 8) & 0xFF;
 253         *fc2 = ans & 0xFF;
 254
 255         *rf1 = detectFSKClk(BitStream, size, *fc1, *fc2);
 256         if (*rf1 == 0) {
 257                 if (verbose || g_debugMode) PrintAndLog("DEBUG: Clock detect error");
 258                 return 0;
 259         }
 260         return 1;
 261 }
 262
 263 // test samples are not just noise
 264 bool graphJustNoise(int *BitStream, int size)
 265 {
 266         //might not be high enough for noisy environments
 267         #define THRESHOLD 15;
 268
 269         bool isNoise = TRUE;
 270         for(int i=0; i < size && isNoise; i++){
 271                 isNoise = BitStream[i] < THRESHOLD;
 272         }
 273         return isNoise;
 274 }