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
  21 /* write a bit to the graph */
  22 void AppendGraph(int redraw, int clock, int bit)
  23 {
  24   int i;
  25
  26   for (i = 0; i < (int)(clock / 2); ++i)
  27     GraphBuffer[GraphTraceLen++] = bit ^ 1;
  28
  29   for (i = (int)(clock / 2); i < clock; ++i)
  30     GraphBuffer[GraphTraceLen++] = bit;
  31
  32   if (redraw)
  33     RepaintGraphWindow();
  34 }
  35
  36 // clear out our graph window
  37 int ClearGraph(int redraw)
  38 {
  39   int gtl = GraphTraceLen;
  40   memset(GraphBuffer, 0x00, GraphTraceLen);
  41
  42   GraphTraceLen = 0;
  43
  44   if (redraw)
  45     RepaintGraphWindow();
  46
  47   return gtl;
  48 }
  49
  50 // DETECT CLOCK NOW IN LFDEMOD.C
  51
  52 void setGraphBuf(uint8_t *buff, size_t size)
  53 {
  54         if ( buff == NULL ) return;
  55
  56         uint16_t i = 0;
  57         if ( size > MAX_GRAPH_TRACE_LEN )
  58                 size = MAX_GRAPH_TRACE_LEN;
  59         ClearGraph(0);
  60         for (; i < size; ++i){
  61                 GraphBuffer[i]=buff[i]-128;
  62         }
  63         GraphTraceLen=size;
  64         RepaintGraphWindow();
  65         return;
  66 }
  67 size_t getFromGraphBuf(uint8_t *buff)
  68 {
  69         if (buff == NULL ) return 0;
  70         uint32_t i;
  71         for (i=0;i<GraphTraceLen;++i){
  72                 if (GraphBuffer[i]>127) GraphBuffer[i]=127; //trim
  73                 if (GraphBuffer[i]<-127) GraphBuffer[i]=-127; //trim
  74                 buff[i]=(uint8_t)(GraphBuffer[i]+128);
  75         }
  76         return i;
  77 }
  78
  79 // A simple test to see if there is any data inside Graphbuffer.
  80 bool HasGraphData(){
  81
  82         if ( GraphTraceLen <= 0) {
  83                 PrintAndLog("No data available, try reading something first");
  84                 return false;
  85         }
  86         return true;
  87 }
  88
  89 // Detect high and lows in Grapbuffer.
  90 // Only loops the first 256 values.
  91 void DetectHighLowInGraph(int *high, int *low, bool addFuzz) {
  92
  93         uint8_t loopMax = 255;
  94         if ( loopMax > GraphTraceLen)
  95                 loopMax = GraphTraceLen;
  96
  97         for (uint8_t i = 0; i < loopMax; ++i) {
  98                 if (GraphBuffer[i] > *high)
  99                         *high = GraphBuffer[i];
 100                 else if (GraphBuffer[i] < *low)
 101                         *low = GraphBuffer[i];
 102         }
 103
 104         //12% fuzz in case highs and lows aren't clipped
 105         if (addFuzz) {
 106                 *high = (int)(*high * .88);
 107                 *low  = (int)(*low  * .88);
 108         }
 109 }
 110
 111 // Get or auto-detect ask clock rate
 112 int GetAskClock(const char str[], bool printAns, bool verbose)
 113 {
 114         int clock;
 115         sscanf(str, "%i", &clock);
 116         if (!strcmp(str, ""))
 117                 clock = 0;
 118
 119         if (clock != 0)
 120                 return clock;
 121         // Auto-detect clock
 122         uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
 123         size_t size = getFromGraphBuf(grph);
 124         if (size == 0) {
 125                 if (verbose)
 126                         PrintAndLog("Failed to copy from graphbuffer");
 127                 return -1;
 128         }
 129         DetectASKClock(grph, size, &clock, 20);
 130         // Only print this message if we're not looping something
 131         if (printAns){
 132                 PrintAndLog("Auto-detected clock rate: %d", clock);
 133         }
 134         return clock;
 135 }
 136
 137 int GetPskClock(const char str[], bool printAns, bool verbose)
 138 {
 139         int clock;
 140         sscanf(str, "%i", &clock);
 141         if (!strcmp(str, ""))
 142                 clock = 0;
 143
 144         if (clock!=0)
 145                 return clock;
 146         // Auto-detect clock
 147         uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
 148         size_t size = getFromGraphBuf(grph);
 149         if ( size == 0 ) {
 150                 if (verbose)
 151                         PrintAndLog("Failed to copy from graphbuffer");
 152                 return -1;
 153         }
 154         clock = DetectPSKClock(grph,size,0);
 155         // Only print this message if we're not looping something
 156         if (printAns){
 157                 PrintAndLog("Auto-detected clock rate: %d", clock);
 158         }
 159         return clock;
 160 }
 161
 162 uint8_t GetNrzClock(const char str[], bool printAns, bool verbose)
 163 {
 164         int clock;
 165         sscanf(str, "%i", &clock);
 166         if (!strcmp(str, ""))
 167                 clock = 0;
 168
 169         if (clock!=0)
 170                 return clock;
 171         // Auto-detect clock
 172         uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
 173         size_t size = getFromGraphBuf(grph);
 174         if ( size == 0 ) {
 175                 if (verbose)
 176                         PrintAndLog("Failed to copy from graphbuffer");
 177                 return -1;
 178         }
 179         clock = DetectNRZClock(grph, size, 0);
 180         // Only print this message if we're not looping something
 181         if (printAns){
 182                 PrintAndLog("Auto-detected clock rate: %d", clock);
 183         }
 184         return clock;
 185 }
 186 //by marshmellow
 187 //attempt to detect the field clock and bit clock for FSK
 188 uint8_t GetFskClock(const char str[], bool printAns, bool verbose)
 189 {
 190         int clock;
 191         sscanf(str, "%i", &clock);
 192         if (!strcmp(str, ""))
 193                 clock = 0;
 194         if (clock != 0) return (uint8_t)clock;
 195
 196         uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
 197         size_t size = getFromGraphBuf(BitStream);
 198         if (size==0) return 0;
 199         uint8_t dummy = 0;
 200         uint16_t ans = countFC(BitStream, size, &dummy);
 201         if (ans==0) {
 202                 if (verbose) PrintAndLog("DEBUG: No data found");
 203                 return 0;
 204         }
 205         uint8_t fc1, fc2;
 206         fc1 = (ans >> 8) & 0xFF;
 207         fc2 = ans & 0xFF;
 208
 209         uint8_t rf1 = detectFSKClk(BitStream, size, fc1, fc2);
 210         if (rf1==0) {
 211                 if (verbose) PrintAndLog("DEBUG: Clock detect error");
 212                 return 0;
 213         }
 214         if ((fc1==10 && fc2==8) || (fc1==8 && fc2==5)){
 215                 if (printAns) PrintAndLog("Detected Field Clocks: FC/%d, FC/%d - Bit Clock: RF/%d", fc1, fc2, rf1);
 216                 return rf1;
 217         }
 218         if (verbose){
 219                 PrintAndLog("DEBUG: unknown fsk field clock detected");
 220                 PrintAndLog("Detected Field Clocks: FC/%d, FC/%d - Bit Clock: RF/%d", fc1, fc2, rf1);
 221         }
 222         return 0;
 223 }