Merge branch 'master' of https://github.com/Proxmark/proxmark3

[proxmark3-svn] / client / cmddata.c

//-----------------------------------------------------------------------------
// Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Data and Graph commands
//-----------------------------------------------------------------------------

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "proxmark3.h"
#include "data.h"
#include "ui.h"
#include "graph.h"
#include "cmdparser.h"
#include "util.h"
#include "cmdmain.h"
#include "cmddata.h"
#include "lfdemod.h"
#include "usb_cmd.h"
#include "crc.h"
#include "crc16.h"

uint8_t DemodBuffer[MAX_DEMOD_BUF_LEN];
uint8_t g_debugMode;
size_t DemodBufferLen;
static int CmdHelp(const char *Cmd);

//set the demod buffer with given array of binary (one bit per byte)
//by marshmellow
void setDemodBuf(uint8_t *buff, size_t size, size_t startIdx)
{
        if (buff == NULL) 
                return;

        if ( size >= MAX_DEMOD_BUF_LEN)
                size = MAX_DEMOD_BUF_LEN;

        size_t i = 0;
        for (; i < size; i++){
                DemodBuffer[i]=buff[startIdx++];
        }
        DemodBufferLen=size;
        return;
}

int CmdSetDebugMode(const char *Cmd)
{
        int demod=0;
        sscanf(Cmd, "%i", &demod);
        g_debugMode=(uint8_t)demod;
        return 1;
}

int usage_data_printdemodbuf(){
                PrintAndLog("Usage: data printdemodbuffer x o <offset>");
                PrintAndLog("Options:        ");
                PrintAndLog("       h          This help");
                PrintAndLog("       x          output in hex (omit for binary output)");
                PrintAndLog("       o <offset> enter offset in # of bits");
                return 0;       
}

//by marshmellow
void printDemodBuff(void)
{
        int bitLen = DemodBufferLen;
        if (bitLen<1) {
                PrintAndLog("no bits found in demod buffer");
                return;
        }
        if (bitLen>512) bitLen=512; //max output to 512 bits if we have more - should be plenty

        char *bin = sprint_bin_break(DemodBuffer,bitLen,16);
        PrintAndLog("%s",bin);

        return;
}

int CmdPrintDemodBuff(const char *Cmd)
{
        char hex[512]={0x00};
        bool hexMode = false;
        bool errors = false;
        uint8_t offset = 0;
        char cmdp = 0;
        while(param_getchar(Cmd, cmdp) != 0x00)
        {
                switch(param_getchar(Cmd, cmdp))
                {
                case 'h':
                case 'H':
                        return usage_data_printdemodbuf();
                case 'x':
                case 'X':
                        hexMode = true;
                        cmdp++;
                        break;
                case 'o':
                case 'O':
                        offset = param_get8(Cmd, cmdp+1);
                        if (!offset) errors = true;
                        cmdp += 2;
                        break;
                default:
                        PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
                        errors = true;
                        break;
                }
                if(errors) break;
        }
        //Validations
        if(errors) return usage_data_printdemodbuf();

        int numBits = (DemodBufferLen-offset) & 0x7FC; //make sure we don't exceed our string

        if (hexMode){
                char *buf = (char *) (DemodBuffer + offset);
                numBits = binarraytohex(hex, buf, numBits);
                if (numBits==0) return 0;
                PrintAndLog("DemodBuffer: %s",hex);             
        } else {
                //setDemodBuf(DemodBuffer, DemodBufferLen-offset, offset);
                char *bin = sprint_bin_break(DemodBuffer+offset,numBits,16);
                PrintAndLog("DemodBuffer:\n%s",bin);
        }
        return 1;
}

//by marshmellow
//this function strictly converts >1 to 1 and <1 to 0 for each sample in the graphbuffer
int CmdGetBitStream(const char *Cmd)
{
        int i;
        CmdHpf(Cmd);
        for (i = 0; i < GraphTraceLen; i++) {
                if (GraphBuffer[i] >= 1) {
                        GraphBuffer[i] = 1;
                } else {
                        GraphBuffer[i] = 0;
                }
        }
        RepaintGraphWindow();
        return 0;
}

//by marshmellow
//print 64 bit EM410x ID in multiple formats
void printEM410x(uint32_t hi, uint64_t id)
{
        if (id || hi){
                uint64_t iii=1;
                uint64_t id2lo=0;
                uint32_t ii=0;
                uint32_t i=0;
                for (ii=5; ii>0;ii--){
                        for (i=0;i<8;i++){
                                id2lo=(id2lo<<1LL) | ((id & (iii << (i+((ii-1)*8)))) >> (i+((ii-1)*8)));
                        }
                }
                if (hi){
                        //output 88 bit em id
                        PrintAndLog("\nEM TAG ID      : %06X%016llX", hi, id);
                } else{
                        //output 40 bit em id
                        PrintAndLog("\nEM TAG ID      : %010llX", id);
                        PrintAndLog("Unique TAG ID  : %010llX",  id2lo);
                        PrintAndLog("\nPossible de-scramble patterns");
                        PrintAndLog("HoneyWell IdentKey {");
                        PrintAndLog("DEZ 8          : %08lld",id & 0xFFFFFF);
                        PrintAndLog("DEZ 10         : %010lld",id & 0xFFFFFFFF);
                        PrintAndLog("DEZ 5.5        : %05lld.%05lld",(id>>16LL) & 0xFFFF,(id & 0xFFFF));
                        PrintAndLog("DEZ 3.5A       : %03lld.%05lld",(id>>32ll),(id & 0xFFFF));
                        PrintAndLog("DEZ 3.5B       : %03lld.%05lld",(id & 0xFF000000) >> 24,(id & 0xFFFF));
                        PrintAndLog("DEZ 3.5C       : %03lld.%05lld",(id & 0xFF0000) >> 16,(id & 0xFFFF));
                        PrintAndLog("DEZ 14/IK2     : %014lld",id);
                        PrintAndLog("DEZ 15/IK3     : %015lld",id2lo);
                        PrintAndLog("DEZ 20/ZK      : %02lld%02lld%02lld%02lld%02lld%02lld%02lld%02lld%02lld%02lld",
                            (id2lo & 0xf000000000) >> 36,
                            (id2lo & 0x0f00000000) >> 32,
                            (id2lo & 0x00f0000000) >> 28,
                            (id2lo & 0x000f000000) >> 24,
                            (id2lo & 0x0000f00000) >> 20,
                            (id2lo & 0x00000f0000) >> 16,
                            (id2lo & 0x000000f000) >> 12,
                            (id2lo & 0x0000000f00) >> 8,
                            (id2lo & 0x00000000f0) >> 4,
                            (id2lo & 0x000000000f)
                        );
                        uint64_t paxton = (((id>>32) << 24) | (id & 0xffffff))  + 0x143e00;
                        PrintAndLog("}\nOther          : %05lld_%03lld_%08lld",(id&0xFFFF),((id>>16LL) & 0xFF),(id & 0xFFFFFF));  
                        PrintAndLog("Pattern Paxton : %lld [0x%llX]", paxton, paxton);

                        uint32_t p1id = (id & 0xFFFFFF);
                        uint8_t arr[32] = {0x00};
                        int i =0; 
                        int j = 23;
                        for (; i < 24; ++i, --j ){
                                arr[i] = (p1id >> i) & 1;
                        }

                        uint32_t p1  = 0;

                        p1 |= arr[23] << 21;
                        p1 |= arr[22] << 23;
                        p1 |= arr[21] << 20;
                        p1 |= arr[20] << 22;
                                
                        p1 |= arr[19] << 18;
                        p1 |= arr[18] << 16;
                        p1 |= arr[17] << 19;
                        p1 |= arr[16] << 17;
                                
                        p1 |= arr[15] << 13;
                        p1 |= arr[14] << 15;
                        p1 |= arr[13] << 12;
                        p1 |= arr[12] << 14;

                        p1 |= arr[11] << 6;
                        p1 |= arr[10] << 2;
                        p1 |= arr[9]  << 7;
                        p1 |= arr[8]  << 1;

                        p1 |= arr[7]  << 0;
                        p1 |= arr[6]  << 8;
                        p1 |= arr[5]  << 11;
                        p1 |= arr[4]  << 3;

                        p1 |= arr[3]  << 10;
                        p1 |= arr[2]  << 4;
                        p1 |= arr[1]  << 5;
                        p1 |= arr[0]  << 9;
                        PrintAndLog("Pattern 1      : %d [0x%X]", p1, p1);

                        uint16_t sebury1 = id & 0xFFFF;
                        uint8_t  sebury2 = (id >> 16) & 0x7F;
                        uint32_t sebury3 = id & 0x7FFFFF;
                        PrintAndLog("Pattern Sebury : %d %d %d  [0x%X 0x%X 0x%X]", sebury1, sebury2, sebury3, sebury1, sebury2, sebury3);
                }
        }
        return;
}

int AskEm410xDecode(bool verbose, uint32_t *hi, uint64_t *lo )
{
        size_t idx = 0;
        size_t BitLen = DemodBufferLen;
        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        memcpy(BitStream, DemodBuffer, BitLen); 
        if (Em410xDecode(BitStream, &BitLen, &idx, hi, lo)){
                //set GraphBuffer for clone or sim command
                setDemodBuf(BitStream, BitLen, idx);
                if (g_debugMode){
                        PrintAndLog("DEBUG: idx: %d, Len: %d, Printing Demod Buffer:", idx, BitLen);
                        printDemodBuff();
                }
                if (verbose){
                        PrintAndLog("EM410x pattern found: ");
                        printEM410x(*hi, *lo);
                }
                return 1;
        }
        return 0;
}

int AskEm410xDemod(const char *Cmd, uint32_t *hi, uint64_t *lo, bool verbose)
{
        if (!ASKDemod(Cmd, FALSE, FALSE, 1)) return 0;
        return AskEm410xDecode(verbose, hi, lo);
}

//by marshmellow
//takes 3 arguments - clock, invert and maxErr as integers
//attempts to demodulate ask while decoding manchester
//prints binary found and saves in graphbuffer for further commands
int CmdAskEM410xDemod(const char *Cmd)
{
        char cmdp = param_getchar(Cmd, 0);
        if (strlen(Cmd) > 10 || cmdp == 'h' || cmdp == 'H') {
                PrintAndLog("Usage:  data askem410xdemod [clock] <0|1> [maxError]");
                PrintAndLog("     [set clock as integer] optional, if not set, autodetect.");
                PrintAndLog("     <invert>, 1 for invert output");
                PrintAndLog("     [set maximum allowed errors], default = 100.");
                PrintAndLog("");
                PrintAndLog("    sample: data askem410xdemod        = demod an EM410x Tag ID from GraphBuffer");
                PrintAndLog("          : data askem410xdemod 32     = demod an EM410x Tag ID from GraphBuffer using a clock of RF/32");
                PrintAndLog("          : data askem410xdemod 32 1   = demod an EM410x Tag ID from GraphBuffer using a clock of RF/32 and inverting data");
                PrintAndLog("          : data askem410xdemod 1      = demod an EM410x Tag ID from GraphBuffer while inverting data");
                PrintAndLog("          : data askem410xdemod 64 1 0 = demod an EM410x Tag ID from GraphBuffer using a clock of RF/64 and inverting data and allowing 0 demod errors");
                return 0;
        }
        uint64_t lo = 0;
        uint32_t hi = 0;
        return AskEm410xDemod(Cmd, &hi, &lo, true);
}

//by marshmellow
//Cmd Args: Clock, invert, maxErr, maxLen as integers and amplify as char == 'a'
//   (amp may not be needed anymore)
//verbose will print results and demoding messages
//emSearch will auto search for EM410x format in bitstream
//askType switches decode: ask/raw = 0, ask/manchester = 1 
int ASKDemod(const char *Cmd, bool verbose, bool emSearch, uint8_t askType)
{
        int invert=0;
        int clk=0;
        int maxErr=100;
        int maxLen=0;
        uint8_t askAmp = 0;
        char amp = param_getchar(Cmd, 0);
        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        sscanf(Cmd, "%i %i %i %i %c", &clk, &invert, &maxErr, &maxLen, &amp);
        if (!maxLen) maxLen = 512*64;
        if (invert != 0 && invert != 1) {
                PrintAndLog("Invalid argument: %s", Cmd);
                return 0;
        }
        if (clk==1){
                invert=1;
                clk=0;
        }
        if (amp == 'a' || amp == 'A') askAmp=1; 
        size_t BitLen = getFromGraphBuf(BitStream);
        if (g_debugMode) PrintAndLog("DEBUG: Bitlen from grphbuff: %d",BitLen);
        if (BitLen<255) return 0;
        if (maxLen<BitLen && maxLen != 0) BitLen = maxLen;

        int errCnt = askdemod(BitStream, &BitLen, &clk, &invert, maxErr, askAmp, askType);
        if (errCnt<0 || BitLen<16){  //if fatal error (or -1)
                if (g_debugMode) PrintAndLog("DEBUG: no data found %d, errors:%d, bitlen:%d, clock:%d",errCnt,invert,BitLen,clk);
                return 0;
        }
        if (errCnt>maxErr){
                if (g_debugMode) PrintAndLog("DEBUG: Too many errors found, errors:%d, bits:%d, clock:%d",errCnt, BitLen, clk);
                return 0;
        }
        if (verbose || g_debugMode) PrintAndLog("\nUsing Clock:%d, Invert:%d, Bits Found:%d",clk,invert,BitLen);

        //output
        setDemodBuf(BitStream,BitLen,0);
        if (verbose || g_debugMode){
                if (errCnt>0) PrintAndLog("# Errors during Demoding (shown as 7 in bit stream): %d",errCnt);
                if (askType) PrintAndLog("ASK/Manchester - Clock: %d - Decoded bitstream:",clk);
                else PrintAndLog("ASK/Raw - Clock: %d - Decoded bitstream:",clk);
                // Now output the bitstream to the scrollback by line of 16 bits
                printDemodBuff();
                
        }
        uint64_t lo = 0;
        uint32_t hi = 0;
        if (emSearch){
                AskEm410xDecode(true, &hi, &lo);
        }
        return 1;
}

//by marshmellow
//takes 5 arguments - clock, invert, maxErr, maxLen as integers and amplify as char == 'a'
//attempts to demodulate ask while decoding manchester
//prints binary found and saves in graphbuffer for further commands
int Cmdaskmandemod(const char *Cmd)
{
        char cmdp = param_getchar(Cmd, 0);
        if (strlen(Cmd) > 25 || cmdp == 'h' || cmdp == 'H') {
                PrintAndLog("Usage:  data rawdemod am [clock] <invert> [maxError] [maxLen] [amplify]");
                PrintAndLog("     [set clock as integer] optional, if not set, autodetect");
                PrintAndLog("     <invert>, 1 to invert output");
                PrintAndLog("     [set maximum allowed errors], default = 100");
                PrintAndLog("     [set maximum Samples to read], default = 32768 (512 bits at rf/64)");
                PrintAndLog("     <amplify>, 'a' to attempt demod with ask amplification, default = no amp");
                PrintAndLog("");
                PrintAndLog("    sample: data rawdemod am        = demod an ask/manchester tag from GraphBuffer");
                PrintAndLog("          : data rawdemod am 32     = demod an ask/manchester tag from GraphBuffer using a clock of RF/32");
                PrintAndLog("          : data rawdemod am 32 1   = demod an ask/manchester tag from GraphBuffer using a clock of RF/32 and inverting data");
                PrintAndLog("          : data rawdemod am 1      = demod an ask/manchester tag from GraphBuffer while inverting data");
                PrintAndLog("          : data rawdemod am 64 1 0 = demod an ask/manchester tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
                return 0;
        }
        return ASKDemod(Cmd, TRUE, TRUE, 1);
}

//by marshmellow
//manchester decode
//stricktly take 10 and 01 and convert to 0 and 1
int Cmdmandecoderaw(const char *Cmd)
{
        int i =0;
        int errCnt=0;
        size_t size=0;
        int invert=0;
        int maxErr = 20;
        char cmdp = param_getchar(Cmd, 0);
        if (strlen(Cmd) > 5 || cmdp == 'h' || cmdp == 'H') {
                PrintAndLog("Usage:  data manrawdecode [invert] [maxErr]");
                PrintAndLog("     Takes 10 and 01 and converts to 0 and 1 respectively");
                PrintAndLog("     --must have binary sequence in demodbuffer (run data askrawdemod first)");
                PrintAndLog("  [invert]  invert output");               
                PrintAndLog("  [maxErr]  set number of errors allowed (default = 20)");         
                PrintAndLog("");
                PrintAndLog("    sample: data manrawdecode   = decode manchester bitstream from the demodbuffer");
                return 0;
        }
        if (DemodBufferLen==0) return 0;
        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        int high=0,low=0;
        for (;i<DemodBufferLen;++i){
                if (DemodBuffer[i]>high) high=DemodBuffer[i];
                else if(DemodBuffer[i]<low) low=DemodBuffer[i];
                BitStream[i]=DemodBuffer[i];
        }
        if (high>7 || low <0 ){
                PrintAndLog("Error: please raw demod the wave first then manchester raw decode");
                return 0;
        }

        sscanf(Cmd, "%i %i", &invert, &maxErr);
        size=i;
        errCnt=manrawdecode(BitStream, &size, invert);
        if (errCnt>=maxErr){
                PrintAndLog("Too many errors: %d",errCnt);
                return 0;
        }
        PrintAndLog("Manchester Decoded - # errors:%d - data:",errCnt);
        PrintAndLog("%s", sprint_bin_break(BitStream, size, 16));
        if (errCnt==0){
                uint64_t id = 0;
                uint32_t hi = 0;
                size_t idx=0;
                if (Em410xDecode(BitStream, &size, &idx, &hi, &id)){
                        //need to adjust to set bitstream back to manchester encoded data
                        //setDemodBuf(BitStream, size, idx);

                        printEM410x(hi, id);
                }
        }
        return 1;
}

//by marshmellow
//biphase decode
//take 01 or 10 = 0 and 11 or 00 = 1
//takes 2 arguments "offset" default = 0 if 1 it will shift the decode by one bit
// and "invert" default = 0 if 1 it will invert output
//  the argument offset allows us to manually shift if the output is incorrect - [EDIT: now auto detects]
int CmdBiphaseDecodeRaw(const char *Cmd)
{
        size_t size=0;
        int offset=0, invert=0, maxErr=20, errCnt=0;
        char cmdp = param_getchar(Cmd, 0);
        if (strlen(Cmd) > 3 || cmdp == 'h' || cmdp == 'H') {
                PrintAndLog("Usage:  data biphaserawdecode [offset] [invert] [maxErr]");
                PrintAndLog("     Converts 10 or 01 to 1 and 11 or 00 to 0");
                PrintAndLog("     --must have binary sequence in demodbuffer (run data askrawdemod first)");
                PrintAndLog("     --invert for Conditional Dephase Encoding (CDP) AKA Differential Manchester");
                PrintAndLog("");
                PrintAndLog("     [offset <0|1>], set to 0 not to adjust start position or to 1 to adjust decode start position");
                PrintAndLog("     [invert <0|1>], set to 1 to invert output");
                PrintAndLog("     [maxErr int],   set max errors tolerated - default=20");
                PrintAndLog("");
                PrintAndLog("    sample: data biphaserawdecode     = decode biphase bitstream from the demodbuffer");
                PrintAndLog("    sample: data biphaserawdecode 1 1 = decode biphase bitstream from the demodbuffer, set offset, and invert output");
                return 0;
        }
        sscanf(Cmd, "%i %i %i", &offset, &invert, &maxErr);
        if (DemodBufferLen==0){
                PrintAndLog("DemodBuffer Empty - run 'data rawdemod ar' first");
                return 0;
        }
        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        memcpy(BitStream, DemodBuffer, DemodBufferLen); 
        size = DemodBufferLen;
        errCnt=BiphaseRawDecode(BitStream, &size, offset, invert);
        if (errCnt<0){
                PrintAndLog("Error during decode:%d", errCnt);
                return 0;
        }
        if (errCnt>maxErr){
                PrintAndLog("Too many errors attempting to decode: %d",errCnt);
                return 0;
        }

        if (errCnt>0){
                PrintAndLog("# Errors found during Demod (shown as 7 in bit stream): %d",errCnt);
        }
        PrintAndLog("Biphase Decoded using offset: %d - # invert:%d - data:",offset,invert);
        PrintAndLog("%s", sprint_bin_break(BitStream, size, 16));
        
        if (offset) setDemodBuf(DemodBuffer,DemodBufferLen-offset, offset);  //remove first bit from raw demod
        return 1;
}

//by marshmellow
// - ASK Demod then Biphase decode GraphBuffer samples
int ASKbiphaseDemod(const char *Cmd, bool verbose)
{
        //ask raw demod GraphBuffer first
        int offset=0, clk=0, invert=0, maxErr=0;
        sscanf(Cmd, "%i %i %i %i", &offset, &clk, &invert, &maxErr);
        
        uint8_t BitStream[MAX_DEMOD_BUF_LEN];
        size_t size = getFromGraphBuf(BitStream);         
        int errCnt = askdemod(BitStream, &size, &clk, &invert, maxErr, 0, 0);  
        if ( errCnt < 0 || errCnt > maxErr ) {   
                if (g_debugMode) PrintAndLog("DEBUG: no data or error found %d, clock: %d", errCnt, clk);  
                        return 0;  
        } 

        //attempt to Biphase decode BitStream
        errCnt = BiphaseRawDecode(BitStream, &size, offset, invert);
        if (errCnt < 0){
                if (g_debugMode || verbose) PrintAndLog("Error BiphaseRawDecode: %d", errCnt);
                return 0;
        } 
        if (errCnt > maxErr) {
                if (g_debugMode || verbose) PrintAndLog("Error BiphaseRawDecode too many errors: %d", errCnt);
                return 0;
        }
        //success set DemodBuffer and return
        setDemodBuf(BitStream, size, 0);
        if (g_debugMode || verbose){
                PrintAndLog("Biphase Decoded using offset: %d - clock: %d - # errors:%d - data:",offset,clk,errCnt);
                printDemodBuff();
        }
        return 1;
}
//by marshmellow - see ASKbiphaseDemod
int Cmdaskbiphdemod(const char *Cmd)
{
        char cmdp = param_getchar(Cmd, 0);
        if (strlen(Cmd) > 25 || cmdp == 'h' || cmdp == 'H') {
                PrintAndLog("Usage:  data rawdemod ab [offset] [clock] <invert> [maxError] [maxLen] <amplify>");
                PrintAndLog("     [offset], offset to begin biphase, default=0");
                PrintAndLog("     [set clock as integer] optional, if not set, autodetect");
                PrintAndLog("     <invert>, 1 to invert output");
                PrintAndLog("     [set maximum allowed errors], default = 100");
                PrintAndLog("     [set maximum Samples to read], default = 32768 (512 bits at rf/64)");
                PrintAndLog("     <amplify>, 'a' to attempt demod with ask amplification, default = no amp");
                PrintAndLog("     NOTE: <invert>  can be entered as second or third argument");
                PrintAndLog("     NOTE: <amplify> can be entered as first, second or last argument");
                PrintAndLog("     NOTE: any other arg must have previous args set to work");
                PrintAndLog("");
                PrintAndLog("     NOTE: --invert for Conditional Dephase Encoding (CDP) AKA Differential Manchester");
                PrintAndLog("");
                PrintAndLog("    sample: data rawdemod ab              = demod an ask/biph tag from GraphBuffer");
                PrintAndLog("          : data rawdemod ab 0 a          = demod an ask/biph tag from GraphBuffer, amplified");
                PrintAndLog("          : data rawdemod ab 1 32         = demod an ask/biph tag from GraphBuffer using an offset of 1 and a clock of RF/32");
                PrintAndLog("          : data rawdemod ab 0 32 1       = demod an ask/biph tag from GraphBuffer using a clock of RF/32 and inverting data");
                PrintAndLog("          : data rawdemod ab 0 1          = demod an ask/biph tag from GraphBuffer while inverting data");
                PrintAndLog("          : data rawdemod ab 0 64 1 0     = demod an ask/biph tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
                PrintAndLog("          : data rawdemod ab 0 64 1 0 0 a = demod an ask/biph tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors, and amp");
                return 0;
        }
        return ASKbiphaseDemod(Cmd, TRUE);
}

//by marshmellow
//attempts to demodulate and identify a G_Prox_II verex/chubb card
//WARNING: if it fails during some points it will destroy the DemodBuffer data
// but will leave the GraphBuffer intact.
//if successful it will push askraw data back to demod buffer ready for emulation
int CmdG_Prox_II_Demod(const char *Cmd)
{
        if (!ASKbiphaseDemod(Cmd, FALSE)){
                if (g_debugMode) PrintAndLog("ASKbiphaseDemod failed 1st try");
                return 0;
        }
        size_t size = DemodBufferLen;
        //call lfdemod.c demod for gProxII
        int ans = gProxII_Demod(DemodBuffer, &size);
        if (ans < 0){
                if (g_debugMode) PrintAndLog("Error gProxII_Demod");
                return 0;
        }
        //got a good demod
        uint32_t ByteStream[65] = {0x00};
        uint8_t xorKey=0;
        uint8_t keyCnt=0;
        uint8_t bitCnt=0;
        uint8_t ByteCnt=0;
        size_t startIdx = ans + 6; //start after preamble
        for (size_t idx = 0; idx<size-6; idx++){
                if ((idx+1) % 5 == 0){
                        //spacer bit - should be 0
                        if (DemodBuffer[startIdx+idx] != 0) {
                                if (g_debugMode) PrintAndLog("Error spacer not 0: %d, pos: %d",DemodBuffer[startIdx+idx],startIdx+idx);
                                return 0;
                        }
                        continue;
                } 
                if (keyCnt<8){ //lsb first
                        xorKey = xorKey | (DemodBuffer[startIdx+idx]<<keyCnt);
                        keyCnt++;
                        if (keyCnt==8 && g_debugMode) PrintAndLog("xorKey Found: %02x", xorKey);
                        continue;
                }
                //lsb first
                ByteStream[ByteCnt] = ByteStream[ByteCnt] | (DemodBuffer[startIdx+idx]<<bitCnt);
                bitCnt++;
                if (bitCnt % 8 == 0){
                        if (g_debugMode) PrintAndLog("byte %d: %02x",ByteCnt,ByteStream[ByteCnt]);
                        bitCnt=0;
                        ByteCnt++;
                }
        }
        for (uint8_t i = 0; i < ByteCnt; i++){
                ByteStream[i] ^= xorKey; //xor
                if (g_debugMode) PrintAndLog("byte %d after xor: %02x", i, ByteStream[i]);
        }
        //now ByteStream contains 64 bytes of decrypted raw tag data
        // 
        uint8_t fmtLen = ByteStream[0]>>2;
        uint32_t FC = 0;
        uint32_t Card = 0;
        uint32_t raw1 = bytebits_to_byte(DemodBuffer+ans,32);
        uint32_t raw2 = bytebits_to_byte(DemodBuffer+ans+32, 32);
        uint32_t raw3 = bytebits_to_byte(DemodBuffer+ans+64, 32);

        if (fmtLen==36){
                FC = ((ByteStream[3] & 0x7F)<<7) | (ByteStream[4]>>1);
                Card = ((ByteStream[4]&1)<<19) | (ByteStream[5]<<11) | (ByteStream[6]<<3) | (ByteStream[7]>>5);
                PrintAndLog("G-Prox-II Found: FmtLen %d, FC %d, Card %d",fmtLen,FC,Card);
        } else if(fmtLen==26){
                FC = ((ByteStream[3] & 0x7F)<<1) | (ByteStream[4]>>7);
                Card = ((ByteStream[4]&0x7F)<<9) | (ByteStream[5]<<1) | (ByteStream[6]>>7);
                PrintAndLog("G-Prox-II Found: FmtLen %d, FC %d, Card %d",fmtLen,FC,Card);    
        } else {
                PrintAndLog("Unknown G-Prox-II Fmt Found: FmtLen %d",fmtLen);
        }
        PrintAndLog("Raw: %08x%08x%08x", raw1,raw2,raw3);
        setDemodBuf(DemodBuffer+ans, 96, 0);
        return 1;
}

//by marshmellow - see ASKDemod
int Cmdaskrawdemod(const char *Cmd)
{
        char cmdp = param_getchar(Cmd, 0);
        if (strlen(Cmd) > 25 || cmdp == 'h' || cmdp == 'H') {
                PrintAndLog("Usage:  data rawdemod ar [clock] <invert> [maxError] [maxLen] [amplify]");
                PrintAndLog("     [set clock as integer] optional, if not set, autodetect");
                PrintAndLog("     <invert>, 1 to invert output");
                PrintAndLog("     [set maximum allowed errors], default = 100");
                PrintAndLog("     [set maximum Samples to read], default = 32768 (1024 bits at rf/64)");
                PrintAndLog("     <amplify>, 'a' to attempt demod with ask amplification, default = no amp");
                PrintAndLog("");
                PrintAndLog("    sample: data rawdemod ar            = demod an ask tag from GraphBuffer");
                PrintAndLog("          : data rawdemod ar a          = demod an ask tag from GraphBuffer, amplified");
                PrintAndLog("          : data rawdemod ar 32         = demod an ask tag from GraphBuffer using a clock of RF/32");
                PrintAndLog("          : data rawdemod ar 32 1       = demod an ask tag from GraphBuffer using a clock of RF/32 and inverting data");
                PrintAndLog("          : data rawdemod ar 1          = demod an ask tag from GraphBuffer while inverting data");
                PrintAndLog("          : data rawdemod ar 64 1 0     = demod an ask tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
                PrintAndLog("          : data rawdemod ar 64 1 0 0 a = demod an ask tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors, and amp");
                return 0;
        }
        return ASKDemod(Cmd, TRUE, FALSE, 0);
}

int AutoCorrelate(int window, bool SaveGrph, bool verbose)
{
        static int CorrelBuffer[MAX_GRAPH_TRACE_LEN];
        size_t Correlation = 0;
        int maxSum = 0;
        int lastMax = 0;
        if (verbose) PrintAndLog("performing %d correlations", GraphTraceLen - window);
        for (int i = 0; i < GraphTraceLen - window; ++i) {
                int sum = 0;
                for (int j = 0; j < window; ++j) {
                        sum += (GraphBuffer[j]*GraphBuffer[i + j]) / 256;
                }
                CorrelBuffer[i] = sum;
                if (sum >= maxSum-100 && sum <= maxSum+100){
                        //another max
                        Correlation = i-lastMax;
                        lastMax = i;
                        if (sum > maxSum) maxSum = sum;
                } else if (sum > maxSum){
                        maxSum=sum;
                        lastMax = i;
                }
        }
        if (Correlation==0){
                //try again with wider margin
                for (int i = 0; i < GraphTraceLen - window; i++){
                        if (CorrelBuffer[i] >= maxSum-(maxSum*0.05) && CorrelBuffer[i] <= maxSum+(maxSum*0.05)){
                                //another max
                                Correlation = i-lastMax;
                                lastMax = i;
                                //if (CorrelBuffer[i] > maxSum) maxSum = sum;
                        }
                }
        }
        if (verbose && Correlation > 0) PrintAndLog("Possible Correlation: %d samples",Correlation);

        if (SaveGrph){
                GraphTraceLen = GraphTraceLen - window;
                memcpy(GraphBuffer, CorrelBuffer, GraphTraceLen * sizeof (int));
                RepaintGraphWindow();  
        }
        return Correlation;
}

int usage_data_autocorr(void)
{
        //print help
        PrintAndLog("Usage: data autocorr [window] [g]");
        PrintAndLog("Options:        ");
        PrintAndLog("       h              This help");
        PrintAndLog("       [window]       window length for correlation - default = 4000");
        PrintAndLog("       g              save back to GraphBuffer (overwrite)");
        return 0;
}

int CmdAutoCorr(const char *Cmd)
{
        char cmdp = param_getchar(Cmd, 0);
        if (cmdp == 'h' || cmdp == 'H') 
                return usage_data_autocorr();
        int window = 4000; //set default
        char grph=0;
        bool updateGrph = FALSE;
        sscanf(Cmd, "%i %c", &window, &grph);

        if (window >= GraphTraceLen) {
                PrintAndLog("window must be smaller than trace (%d samples)",
                        GraphTraceLen);
                return 0;
        }
        if (grph == 'g') updateGrph=TRUE;
        return AutoCorrelate(window, updateGrph, TRUE);
}

int CmdBitsamples(const char *Cmd)
{
        int cnt = 0;
        uint8_t got[12288];

        GetFromBigBuf(got,sizeof(got),0);
        WaitForResponse(CMD_ACK,NULL);

                for (int j = 0; j < sizeof(got); j++) {
                        for (int k = 0; k < 8; k++) {
                                if(got[j] & (1 << (7 - k))) {
                                        GraphBuffer[cnt++] = 1;
                                } else {
                                        GraphBuffer[cnt++] = 0;
                                }
                        }
        }
        GraphTraceLen = cnt;
        RepaintGraphWindow();
        return 0;
}

int CmdBuffClear(const char *Cmd)
{
        UsbCommand c = {CMD_BUFF_CLEAR};
        SendCommand(&c);
        ClearGraph(true);
        return 0;
}

int CmdDec(const char *Cmd)
{
        for (int i = 0; i < (GraphTraceLen / 2); ++i)
                GraphBuffer[i] = GraphBuffer[i * 2];
        GraphTraceLen /= 2;
        PrintAndLog("decimated by 2");
        RepaintGraphWindow();
        return 0;
}
/**
 * Undecimate - I'd call it 'interpolate', but we'll save that
 * name until someone does an actual interpolation command, not just
 * blindly repeating samples
 * @param Cmd
 * @return
 */
int CmdUndec(const char *Cmd)
{
        if(param_getchar(Cmd, 0) == 'h')
        {
                PrintAndLog("Usage: data undec [factor]");
                PrintAndLog("This function performs un-decimation, by repeating each sample N times");
                PrintAndLog("Options:        ");
                PrintAndLog("       h            This help");
                PrintAndLog("       factor       The number of times to repeat each sample.[default:2]");
                PrintAndLog("Example: 'data undec 3'");
                return 0;
        }

        uint8_t factor = param_get8ex(Cmd, 0,2, 10);
        //We have memory, don't we?
        int swap[MAX_GRAPH_TRACE_LEN] = { 0 };
        uint32_t g_index = 0 ,s_index = 0;
        while(g_index < GraphTraceLen && s_index < MAX_GRAPH_TRACE_LEN)
        {
                int count = 0;
                for(count = 0; count < factor && s_index+count < MAX_GRAPH_TRACE_LEN; count ++)
                        swap[s_index+count] = GraphBuffer[g_index];
                s_index+=count;
        }

        memcpy(GraphBuffer,swap, s_index * sizeof(int));
        GraphTraceLen = s_index;
        RepaintGraphWindow();
        return 0;
}

//by marshmellow
//shift graph zero up or down based on input + or -
int CmdGraphShiftZero(const char *Cmd)
{

        int shift=0;
        //set options from parameters entered with the command
        sscanf(Cmd, "%i", &shift);
        int shiftedVal=0;
        for(int i = 0; i<GraphTraceLen; i++){
                shiftedVal=GraphBuffer[i]+shift;
                if (shiftedVal>127) 
                        shiftedVal=127;
                else if (shiftedVal<-127) 
                        shiftedVal=-127;
                GraphBuffer[i]= shiftedVal;
        }
        CmdNorm("");
        return 0;
}

//by marshmellow
//use large jumps in read samples to identify edges of waves and then amplify that wave to max
//similar to dirtheshold, threshold commands 
//takes a threshold length which is the measured length between two samples then determines an edge
int CmdAskEdgeDetect(const char *Cmd)
{
        int thresLen = 25;
        sscanf(Cmd, "%i", &thresLen); 

        for(int i = 1; i<GraphTraceLen; i++){
                if (GraphBuffer[i]-GraphBuffer[i-1]>=thresLen) //large jump up
                        GraphBuffer[i-1] = 127;
                else if(GraphBuffer[i]-GraphBuffer[i-1]<=-1*thresLen) //large jump down
                        GraphBuffer[i-1] = -127;
        }
        RepaintGraphWindow();
        return 0;
}

/* Print our clock rate */
// uses data from graphbuffer
// adjusted to take char parameter for type of modulation to find the clock - by marshmellow.
int CmdDetectClockRate(const char *Cmd)
{
        char cmdp = param_getchar(Cmd, 0);
        if (strlen(Cmd) > 6 || strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') {
                PrintAndLog("Usage:  data detectclock [modulation] <clock>");
                PrintAndLog("     [modulation as char], specify the modulation type you want to detect the clock of");
                PrintAndLog("     <clock>             , specify the clock (optional - to get best start position only)");
                PrintAndLog("       'a' = ask, 'f' = fsk, 'n' = nrz/direct, 'p' = psk");
                PrintAndLog("");
                PrintAndLog("    sample: data detectclock a    = detect the clock of an ask modulated wave in the GraphBuffer");
                PrintAndLog("            data detectclock f    = detect the clock of an fsk modulated wave in the GraphBuffer");
                PrintAndLog("            data detectclock p    = detect the clock of an psk modulated wave in the GraphBuffer");
                PrintAndLog("            data detectclock n    = detect the clock of an nrz/direct modulated wave in the GraphBuffer");
        }
        int ans=0;
        if (cmdp == 'a'){
                ans = GetAskClock(Cmd+1, true, false);
        } else if (cmdp == 'f'){
                ans = GetFskClock("", true, false);
        } else if (cmdp == 'n'){
                ans = GetNrzClock("", true, false);
        } else if (cmdp == 'p'){
                ans = GetPskClock("", true, false);
        } else {
                PrintAndLog ("Please specify a valid modulation to detect the clock of - see option h for help");
        }
        return ans;
}

char *GetFSKType(uint8_t fchigh, uint8_t fclow, uint8_t invert)
{
        char *fskType;
        if (fchigh==10 && fclow==8){
                if (invert) //fsk2a
                        fskType = "FSK2a";
                else //fsk2
                        fskType = "FSK2";
        } else if (fchigh == 8 && fclow == 5) {
                if (invert)
                        fskType = "FSK1";
                else
                        fskType = "FSK1a";
        } else {
                fskType = "FSK??";
        }
        return fskType;
}

//by marshmellow
//fsk raw demod and print binary
//takes 4 arguments - Clock, invert, fchigh, fclow
//defaults: clock = 50, invert=1, fchigh=10, fclow=8 (RF/10 RF/8 (fsk2a))
int FSKrawDemod(const char *Cmd, bool verbose)
{
        //raw fsk demod  no manchester decoding no start bit finding just get binary from wave
        //set defaults
        int rfLen = 0;
        int invert = 0;
        int fchigh = 0;
        int fclow = 0;

        //set options from parameters entered with the command
        sscanf(Cmd, "%i %i %i %i", &rfLen, &invert, &fchigh, &fclow);

        if (strlen(Cmd)>0 && strlen(Cmd)<=2) {
                 if (rfLen==1){
                        invert = 1;   //if invert option only is used
                        rfLen = 0;
                 }
        }

        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        size_t BitLen = getFromGraphBuf(BitStream);
        if (BitLen==0) return 0;
        //get field clock lengths
        uint16_t fcs=0;
        if (fchigh==0 || fclow == 0){
                fcs = countFC(BitStream, BitLen, 1);
                if (fcs==0){
                        fchigh=10;
                        fclow=8;
                }else{
                        fchigh = (fcs >> 8) & 0xFF;
                        fclow = fcs & 0xFF;
                }
        }
        //get bit clock length
        if (rfLen==0){
                rfLen = detectFSKClk(BitStream, BitLen, fchigh, fclow);
                if (rfLen == 0) rfLen = 50;
        }
        int size = fskdemod(BitStream,BitLen,(uint8_t)rfLen,(uint8_t)invert,(uint8_t)fchigh,(uint8_t)fclow);
        if (size>0){
                setDemodBuf(BitStream,size,0);

                // Now output the bitstream to the scrollback by line of 16 bits
                if (verbose || g_debugMode) {
                        PrintAndLog("\nUsing Clock:%d, invert:%d, fchigh:%d, fclow:%d", rfLen, invert, fchigh, fclow);
                        PrintAndLog("%s decoded bitstream:",GetFSKType(fchigh,fclow,invert));
                        printDemodBuff();
                }

                return 1;
        } else{
                if (g_debugMode) PrintAndLog("no FSK data found");
        }
        return 0;
}

//by marshmellow
//fsk raw demod and print binary
//takes 4 arguments - Clock, invert, fchigh, fclow
//defaults: clock = 50, invert=1, fchigh=10, fclow=8 (RF/10 RF/8 (fsk2a))
int CmdFSKrawdemod(const char *Cmd)
{
        char cmdp = param_getchar(Cmd, 0);
        if (strlen(Cmd) > 10 || cmdp == 'h' || cmdp == 'H') {
                PrintAndLog("Usage:  data rawdemod fs [clock] <invert> [fchigh] [fclow]");
                PrintAndLog("     [set clock as integer] optional, omit for autodetect.");
                PrintAndLog("     <invert>, 1 for invert output, can be used even if the clock is omitted");
                PrintAndLog("     [fchigh], larger field clock length, omit for autodetect");
                PrintAndLog("     [fclow], small field clock length, omit for autodetect");
                PrintAndLog("");
                PrintAndLog("    sample: data rawdemod fs           = demod an fsk tag from GraphBuffer using autodetect");
                PrintAndLog("          : data rawdemod fs 32        = demod an fsk tag from GraphBuffer using a clock of RF/32, autodetect fc");
                PrintAndLog("          : data rawdemod fs 1         = demod an fsk tag from GraphBuffer using autodetect, invert output");   
                PrintAndLog("          : data rawdemod fs 32 1      = demod an fsk tag from GraphBuffer using a clock of RF/32, invert output, autodetect fc");
                PrintAndLog("          : data rawdemod fs 64 0 8 5  = demod an fsk1 RF/64 tag from GraphBuffer");
                PrintAndLog("          : data rawdemod fs 50 0 10 8 = demod an fsk2 RF/50 tag from GraphBuffer");
                PrintAndLog("          : data rawdemod fs 50 1 10 8 = demod an fsk2a RF/50 tag from GraphBuffer");
                return 0;
        }
        return FSKrawDemod(Cmd, TRUE);
}

//by marshmellow (based on existing demod + holiman's refactor)
//HID Prox demod - FSK RF/50 with preamble of 00011101 (then manchester encoded)
//print full HID Prox ID and some bit format details if found
int CmdFSKdemodHID(const char *Cmd)
{
        //raw fsk demod no manchester decoding no start bit finding just get binary from wave
        uint32_t hi2=0, hi=0, lo=0;

        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        size_t BitLen = getFromGraphBuf(BitStream);
        if (BitLen==0) return 0;
        //get binary from fsk wave
        int idx = HIDdemodFSK(BitStream,&BitLen,&hi2,&hi,&lo);
        if (idx<0){
                if (g_debugMode){
                        if (idx==-1){
                                PrintAndLog("DEBUG: Just Noise Detected");
                        } else if (idx == -2) {
                                PrintAndLog("DEBUG: Error demoding fsk");
                        } else if (idx == -3) {
                                PrintAndLog("DEBUG: Preamble not found");
                        } else if (idx == -4) {
                                PrintAndLog("DEBUG: Error in Manchester data, SIZE: %d", BitLen);
                        } else {
                                PrintAndLog("DEBUG: Error demoding fsk %d", idx);
                        }   
                }
                return 0;
        }
        if (hi2==0 && hi==0 && lo==0) {
                if (g_debugMode) PrintAndLog("DEBUG: Error - no values found");
                return 0;
        }
        if (hi2 != 0){ //extra large HID tags
                PrintAndLog("HID Prox TAG ID: %x%08x%08x (%d)",
                         (unsigned int) hi2, (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
        }
        else {  //standard HID tags <38 bits
                uint8_t fmtLen = 0;
                uint32_t fc = 0;
                uint32_t cardnum = 0;
                if (((hi>>5)&1)==1){//if bit 38 is set then < 37 bit format is used
                        uint32_t lo2=0;
                        lo2=(((hi & 31) << 12) | (lo>>20)); //get bits 21-37 to check for format len bit
                        uint8_t idx3 = 1;
                        while(lo2>1){ //find last bit set to 1 (format len bit)
                                lo2=lo2>>1;
                                idx3++;
                        }
                        fmtLen =idx3+19;
                        fc =0;
                        cardnum=0;
                        if(fmtLen==26){
                                cardnum = (lo>>1)&0xFFFF;
                                fc = (lo>>17)&0xFF;
                        }
                        if(fmtLen==34){
                                cardnum = (lo>>1)&0xFFFF;
                                fc= ((hi&1)<<15)|(lo>>17);
                        }
                        if(fmtLen==35){
                                cardnum = (lo>>1)&0xFFFFF;
                                fc = ((hi&1)<<11)|(lo>>21);
                        }
                }
                else { //if bit 38 is not set then 37 bit format is used
                        fmtLen = 37;
                        fc = 0;
                        cardnum = 0;
                        if(fmtLen == 37){
                                cardnum = (lo>>1)&0x7FFFF;
                                fc = ((hi&0xF)<<12)|(lo>>20);
                        }
                }
                PrintAndLog("HID Prox TAG ID: %x%08x (%d) - Format Len: %dbit - FC: %d - Card: %d",
                        (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF,
                        (unsigned int) fmtLen, (unsigned int) fc, (unsigned int) cardnum);
        }
        setDemodBuf(BitStream,BitLen,idx);
        if (g_debugMode){ 
                PrintAndLog("DEBUG: idx: %d, Len: %d, Printing Demod Buffer:", idx, BitLen);
                printDemodBuff();
        }
        return 1;
}

//by marshmellow
//Paradox Prox demod - FSK RF/50 with preamble of 00001111 (then manchester encoded)
//print full Paradox Prox ID and some bit format details if found
int CmdFSKdemodParadox(const char *Cmd)
{
        //raw fsk demod no manchester decoding no start bit finding just get binary from wave
        uint32_t hi2=0, hi=0, lo=0;

        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        size_t BitLen = getFromGraphBuf(BitStream);
        if (BitLen==0) return 0;
        //get binary from fsk wave
        int idx = ParadoxdemodFSK(BitStream,&BitLen,&hi2,&hi,&lo);
        if (idx<0){
                if (g_debugMode){
                        if (idx==-1){
                                PrintAndLog("DEBUG: Just Noise Detected");     
                        } else if (idx == -2) {
                                PrintAndLog("DEBUG: Error demoding fsk");
                        } else if (idx == -3) {
                                PrintAndLog("DEBUG: Preamble not found");
                        } else if (idx == -4) {
                                PrintAndLog("DEBUG: Error in Manchester data");
                        } else {
                                PrintAndLog("DEBUG: Error demoding fsk %d", idx);
                        }
                }
                return 0;
        }
        if (hi2==0 && hi==0 && lo==0){
                if (g_debugMode) PrintAndLog("DEBUG: Error - no value found");
                return 0;
        }
        uint32_t fc = ((hi & 0x3)<<6) | (lo>>26);
        uint32_t cardnum = (lo>>10)&0xFFFF;
        uint32_t rawLo = bytebits_to_byte(BitStream+idx+64,32);
        uint32_t rawHi = bytebits_to_byte(BitStream+idx+32,32);
        uint32_t rawHi2 = bytebits_to_byte(BitStream+idx,32);

        PrintAndLog("Paradox TAG ID: %x%08x - FC: %d - Card: %d - Checksum: %02x - RAW: %08x%08x%08x",
                hi>>10, (hi & 0x3)<<26 | (lo>>10), fc, cardnum, (lo>>2) & 0xFF, rawHi2, rawHi, rawLo);
        setDemodBuf(BitStream,BitLen,idx);
        if (g_debugMode){ 
                PrintAndLog("DEBUG: idx: %d, len: %d, Printing Demod Buffer:", idx, BitLen);
                printDemodBuff();
        }
        return 1;
}

//by marshmellow
//IO-Prox demod - FSK RF/64 with preamble of 000000001
//print ioprox ID and some format details
int CmdFSKdemodIO(const char *Cmd)
{
        //raw fsk demod no manchester decoding no start bit finding just get binary from wave
        //set defaults
        int idx=0;
        //something in graphbuffer?
        if (GraphTraceLen < 65) {
                if (g_debugMode)PrintAndLog("DEBUG: not enough samples in GraphBuffer");
                return 0;
        }
        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        size_t BitLen = getFromGraphBuf(BitStream);
        if (BitLen==0) return 0;

        //get binary from fsk wave
        idx = IOdemodFSK(BitStream,BitLen);
        if (idx<0){
                if (g_debugMode){
                        if (idx==-1){
                                PrintAndLog("DEBUG: Just Noise Detected");     
                        } else if (idx == -2) {
                                PrintAndLog("DEBUG: not enough samples");
                        } else if (idx == -3) {
                                PrintAndLog("DEBUG: error during fskdemod");        
                        } else if (idx == -4) {
                                PrintAndLog("DEBUG: Preamble not found");
                        } else if (idx == -5) {
                                PrintAndLog("DEBUG: Separator bits not found");
                        } else {
                                PrintAndLog("DEBUG: Error demoding fsk %d", idx);
                        }
                }
                return 0;
        }
        if (idx==0){
                if (g_debugMode){
                        PrintAndLog("DEBUG: IO Prox Data not found - FSK Bits: %d",BitLen);
                        if (BitLen > 92) PrintAndLog("%s", sprint_bin_break(BitStream,92,16));
                } 
                return 0;
        }
                //Index map
                //0           10          20          30          40          50          60
                //|           |           |           |           |           |           |
                //01234567 8 90123456 7 89012345 6 78901234 5 67890123 4 56789012 3 45678901 23
                //-----------------------------------------------------------------------------
                //00000000 0 11110000 1 facility 1 version* 1 code*one 1 code*two 1 ???????? 11
                //
                //XSF(version)facility:codeone+codetwo (raw)
                //Handle the data
        if (idx+64>BitLen) {
                if (g_debugMode) PrintAndLog("not enough bits found - bitlen: %d",BitLen);
                return 0;
        }
        PrintAndLog("%d%d%d%d%d%d%d%d %d",BitStream[idx],    BitStream[idx+1],  BitStream[idx+2], BitStream[idx+3], BitStream[idx+4], BitStream[idx+5], BitStream[idx+6], BitStream[idx+7], BitStream[idx+8]);
        PrintAndLog("%d%d%d%d%d%d%d%d %d",BitStream[idx+9],  BitStream[idx+10], BitStream[idx+11],BitStream[idx+12],BitStream[idx+13],BitStream[idx+14],BitStream[idx+15],BitStream[idx+16],BitStream[idx+17]);
        PrintAndLog("%d%d%d%d%d%d%d%d %d facility",BitStream[idx+18], BitStream[idx+19], BitStream[idx+20],BitStream[idx+21],BitStream[idx+22],BitStream[idx+23],BitStream[idx+24],BitStream[idx+25],BitStream[idx+26]);
        PrintAndLog("%d%d%d%d%d%d%d%d %d version",BitStream[idx+27], BitStream[idx+28], BitStream[idx+29],BitStream[idx+30],BitStream[idx+31],BitStream[idx+32],BitStream[idx+33],BitStream[idx+34],BitStream[idx+35]);
        PrintAndLog("%d%d%d%d%d%d%d%d %d code1",BitStream[idx+36], BitStream[idx+37], BitStream[idx+38],BitStream[idx+39],BitStream[idx+40],BitStream[idx+41],BitStream[idx+42],BitStream[idx+43],BitStream[idx+44]);
        PrintAndLog("%d%d%d%d%d%d%d%d %d code2",BitStream[idx+45], BitStream[idx+46], BitStream[idx+47],BitStream[idx+48],BitStream[idx+49],BitStream[idx+50],BitStream[idx+51],BitStream[idx+52],BitStream[idx+53]);
        PrintAndLog("%d%d%d%d%d%d%d%d %d%d checksum",BitStream[idx+54],BitStream[idx+55],BitStream[idx+56],BitStream[idx+57],BitStream[idx+58],BitStream[idx+59],BitStream[idx+60],BitStream[idx+61],BitStream[idx+62],BitStream[idx+63]);

        uint32_t code = bytebits_to_byte(BitStream+idx,32);
        uint32_t code2 = bytebits_to_byte(BitStream+idx+32,32);
        uint8_t version = bytebits_to_byte(BitStream+idx+27,8); //14,4
        uint8_t facilitycode = bytebits_to_byte(BitStream+idx+18,8) ;
        uint16_t number = (bytebits_to_byte(BitStream+idx+36,8)<<8)|(bytebits_to_byte(BitStream+idx+45,8)); //36,9
        uint8_t crc = bytebits_to_byte(BitStream+idx+54,8);
        uint16_t calccrc = 0;

        for (uint8_t i=1; i<6; ++i){
                calccrc += bytebits_to_byte(BitStream+idx+9*i,8);
        }
        calccrc &= 0xff;
        calccrc = 0xff - calccrc;

        char *crcStr = (crc == calccrc) ? "crc ok": "!crc";

        PrintAndLog("IO Prox XSF(%02d)%02x:%05d (%08x%08x) [%02x %s]",version,facilitycode,number,code,code2, crc, crcStr);
        setDemodBuf(BitStream,64,idx);
        if (g_debugMode){
                PrintAndLog("DEBUG: idx: %d, Len: %d, Printing demod buffer:",idx,64);
                printDemodBuff();
        }
        return 1;
}

//by marshmellow
//AWID Prox demod - FSK RF/50 with preamble of 00000001  (always a 96 bit data stream)
//print full AWID Prox ID and some bit format details if found
int CmdFSKdemodAWID(const char *Cmd)
{

        //int verbose=1;
        //sscanf(Cmd, "%i", &verbose);

        //raw fsk demod no manchester decoding no start bit finding just get binary from wave
        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        size_t size = getFromGraphBuf(BitStream);
        if (size==0) return 0;

        //get binary from fsk wave
        int idx = AWIDdemodFSK(BitStream, &size);
        if (idx<=0){
                if (g_debugMode==1){
                        if (idx == -1)
                                PrintAndLog("DEBUG: Error - not enough samples");
                        else if (idx == -2)
                                PrintAndLog("DEBUG: Error - only noise found");
                        else if (idx == -3)
                                PrintAndLog("DEBUG: Error - problem during FSK demod");
                        else if (idx == -4)
                                PrintAndLog("DEBUG: Error - AWID preamble not found");
                        else if (idx == -5)
                                PrintAndLog("DEBUG: Error - Size not correct: %d", size);
                        else
                                PrintAndLog("DEBUG: Error %d",idx);
                }
                return 0;
        }

        // Index map
        // 0            10            20            30              40            50              60
        // |            |             |             |               |             |               |
        // 01234567 890 1 234 5 678 9 012 3 456 7 890 1 234 5 678 9 012 3 456 7 890 1 234 5 678 9 012 3 - to 96
        // -----------------------------------------------------------------------------
        // 00000001 000 1 110 1 101 1 011 1 101 1 010 0 000 1 000 1 010 0 001 0 110 1 100 0 000 1 000 1
        // premable bbb o bbb o bbw o fff o fff o ffc o ccc o ccc o ccc o ccc o ccc o wxx o xxx o xxx o - to 96
        //          |---26 bit---|    |-----117----||-------------142-------------|
        // b = format bit len, o = odd parity of last 3 bits
        // f = facility code, c = card number
        // w = wiegand parity
        // (26 bit format shown)
 
        //get raw ID before removing parities
        uint32_t rawLo = bytebits_to_byte(BitStream+idx+64,32);
        uint32_t rawHi = bytebits_to_byte(BitStream+idx+32,32);
        uint32_t rawHi2 = bytebits_to_byte(BitStream+idx,32);
        setDemodBuf(BitStream,96,idx);

        size = removeParity(BitStream, idx+8, 4, 1, 88);
        if (size != 66){
                if (g_debugMode==1) PrintAndLog("DEBUG: Error - at parity check-tag size does not match AWID format");
                return 0;
        }
        // ok valid card found!

        // Index map
        // 0           10         20        30          40        50        60
        // |           |          |         |           |         |         |
        // 01234567 8 90123456 7890123456789012 3 456789012345678901234567890123456
        // -----------------------------------------------------------------------------
        // 00011010 1 01110101 0000000010001110 1 000000000000000000000000000000000
        // bbbbbbbb w ffffffff cccccccccccccccc w xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
        // |26 bit|   |-117--| |-----142------|
        // b = format bit len, o = odd parity of last 3 bits
        // f = facility code, c = card number
        // w = wiegand parity
        // (26 bit format shown)

        uint32_t fc = 0;
        uint32_t cardnum = 0;
        uint32_t code1 = 0;
        uint32_t code2 = 0;
        uint8_t fmtLen = bytebits_to_byte(BitStream,8);
        if (fmtLen==26){
                fc = bytebits_to_byte(BitStream+9, 8);
                cardnum = bytebits_to_byte(BitStream+17, 16);
                code1 = bytebits_to_byte(BitStream+8,fmtLen);
                PrintAndLog("AWID Found - BitLength: %d, FC: %d, Card: %d - Wiegand: %x, Raw: %08x%08x%08x", fmtLen, fc, cardnum, code1, rawHi2, rawHi, rawLo);
        } else {
                cardnum = bytebits_to_byte(BitStream+8+(fmtLen-17), 16);
                if (fmtLen>32){
                        code1 = bytebits_to_byte(BitStream+8,fmtLen-32);
                        code2 = bytebits_to_byte(BitStream+8+(fmtLen-32),32);
                        PrintAndLog("AWID Found - BitLength: %d -unknown BitLength- (%d) - Wiegand: %x%08x, Raw: %08x%08x%08x", fmtLen, cardnum, code1, code2, rawHi2, rawHi, rawLo);
                } else{
                        code1 = bytebits_to_byte(BitStream+8,fmtLen);
                        PrintAndLog("AWID Found - BitLength: %d -unknown BitLength- (%d) - Wiegand: %x, Raw: %08x%08x%08x", fmtLen, cardnum, code1, rawHi2, rawHi, rawLo);
                }
        }
        if (g_debugMode){
                PrintAndLog("DEBUG: idx: %d, Len: %d Printing Demod Buffer:", idx, 96);
                printDemodBuff();
        }
        //todo - convert hi2, hi, lo to demodbuffer for future sim/clone commands
        return 1;
}

//by marshmellow
//Pyramid Prox demod - FSK RF/50 with preamble of 0000000000000001  (always a 128 bit data stream)
//print full Farpointe Data/Pyramid Prox ID and some bit format details if found
int CmdFSKdemodPyramid(const char *Cmd)
{
        //raw fsk demod no manchester decoding no start bit finding just get binary from wave
        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        size_t size = getFromGraphBuf(BitStream);
        if (size==0) return 0;

        //get binary from fsk wave
        int idx = PyramiddemodFSK(BitStream, &size);
        if (idx < 0){
                if (g_debugMode==1){
                        if (idx == -5)
                                PrintAndLog("DEBUG: Error - not enough samples");
                        else if (idx == -1)
                                PrintAndLog("DEBUG: Error - only noise found");
                        else if (idx == -2)
                                PrintAndLog("DEBUG: Error - problem during FSK demod");
                        else if (idx == -3)
                                PrintAndLog("DEBUG: Error - Size not correct: %d", size);
                        else if (idx == -4)
                                PrintAndLog("DEBUG: Error - Pyramid preamble not found");
                        else
                                PrintAndLog("DEBUG: Error - idx: %d",idx);
                }
                return 0;
        }
        // Index map
        // 0           10          20          30            40          50          60
        // |           |           |           |             |           |           |
        // 0123456 7 8901234 5 6789012 3 4567890 1 2345678 9 0123456 7 8901234 5 6789012 3
        // -----------------------------------------------------------------------------
        // 0000000 0 0000000 1 0000000 1 0000000 1 0000000 1 0000000 1 0000000 1 0000000 1
        // premable  xxxxxxx o xxxxxxx o xxxxxxx o xxxxxxx o xxxxxxx o xxxxxxx o xxxxxxx o

        // 64    70            80          90          100         110           120
        // |     |             |           |           |           |             |
        // 4567890 1 2345678 9 0123456 7 8901234 5 6789012 3 4567890 1 2345678 9 0123456 7
        // -----------------------------------------------------------------------------
        // 0000000 1 0000000 1 0000000 1 0110111 0 0011000 1 0000001 0 0001100 1 1001010 0
        // xxxxxxx o xxxxxxx o xxxxxxx o xswffff o ffffccc o ccccccc o ccccccw o ppppppp o
        //                                  |---115---||---------71---------|
        // s = format start bit, o = odd parity of last 7 bits
        // f = facility code, c = card number
        // w = wiegand parity, x = extra space for other formats
        // p = unknown checksum
        // (26 bit format shown)

        //get bytes for checksum calc
        uint8_t checksum = bytebits_to_byte(BitStream + idx + 120, 8);
        uint8_t csBuff[14] = {0x00};
        for (uint8_t i = 0; i < 13; i++){
                csBuff[i] = bytebits_to_byte(BitStream + idx + 16 + (i*8), 8);
        }
        //check checksum calc
        //checksum calc thanks to ICEMAN!!
        uint32_t checkCS =  CRC8Maxim(csBuff,13);

        //get raw ID before removing parities
        uint32_t rawLo = bytebits_to_byte(BitStream+idx+96,32);
        uint32_t rawHi = bytebits_to_byte(BitStream+idx+64,32);
        uint32_t rawHi2 = bytebits_to_byte(BitStream+idx+32,32);
        uint32_t rawHi3 = bytebits_to_byte(BitStream+idx,32);
        setDemodBuf(BitStream,128,idx);

        size = removeParity(BitStream, idx+8, 8, 1, 120);
        if (size != 105){
                if (g_debugMode==1) 
                        PrintAndLog("DEBUG: Error at parity check - tag size does not match Pyramid format, SIZE: %d, IDX: %d, hi3: %x",size, idx, rawHi3);
                return 0;
        }

        // ok valid card found!

        // Index map
        // 0         10        20        30        40        50        60        70
        // |         |         |         |         |         |         |         |
        // 01234567890123456789012345678901234567890123456789012345678901234567890
        // -----------------------------------------------------------------------
        // 00000000000000000000000000000000000000000000000000000000000000000000000
        // xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

        // 71         80         90          100
        // |          |          |           |
        // 1 2 34567890 1234567890123456 7 8901234
        // ---------------------------------------
        // 1 1 01110011 0000000001000110 0 1001010
        // s w ffffffff cccccccccccccccc w ppppppp
        //     |--115-| |------71------|
        // s = format start bit, o = odd parity of last 7 bits
        // f = facility code, c = card number
        // w = wiegand parity, x = extra space for other formats
        // p = unknown checksum
        // (26 bit format shown)

        //find start bit to get fmtLen
        int j;
        for (j=0; j<size; j++){
                if(BitStream[j]) break;
        }
        uint8_t fmtLen = size-j-8;
        uint32_t fc = 0;
        uint32_t cardnum = 0;
        uint32_t code1 = 0;
        //uint32_t code2 = 0;
        if (fmtLen==26){
                fc = bytebits_to_byte(BitStream+73, 8);
                cardnum = bytebits_to_byte(BitStream+81, 16);
                code1 = bytebits_to_byte(BitStream+72,fmtLen);
                PrintAndLog("Pyramid ID Found - BitLength: %d, FC: %d, Card: %d - Wiegand: %x, Raw: %08x%08x%08x%08x", fmtLen, fc, cardnum, code1, rawHi3, rawHi2, rawHi, rawLo);
        } else if (fmtLen==45){
                fmtLen=42; //end = 10 bits not 7 like 26 bit fmt
                fc = bytebits_to_byte(BitStream+53, 10);
                cardnum = bytebits_to_byte(BitStream+63, 32);
                PrintAndLog("Pyramid ID Found - BitLength: %d, FC: %d, Card: %d - Raw: %08x%08x%08x%08x", fmtLen, fc, cardnum, rawHi3, rawHi2, rawHi, rawLo);
        } else {
                cardnum = bytebits_to_byte(BitStream+81, 16);
                if (fmtLen>32){
                        //code1 = bytebits_to_byte(BitStream+(size-fmtLen),fmtLen-32);
                        //code2 = bytebits_to_byte(BitStream+(size-32),32);
                        PrintAndLog("Pyramid ID Found - BitLength: %d -unknown BitLength- (%d), Raw: %08x%08x%08x%08x", fmtLen, cardnum, rawHi3, rawHi2, rawHi, rawLo);
                } else{
                        //code1 = bytebits_to_byte(BitStream+(size-fmtLen),fmtLen);
                        PrintAndLog("Pyramid ID Found - BitLength: %d -unknown BitLength- (%d), Raw: %08x%08x%08x%08x", fmtLen, cardnum, rawHi3, rawHi2, rawHi, rawLo);
                }
        }
        if (checksum == checkCS)
                PrintAndLog("Checksum %02x passed", checksum);
        else
                PrintAndLog("Checksum %02x failed - should have been %02x", checksum, checkCS);

        if (g_debugMode){
                PrintAndLog("DEBUG: idx: %d, Len: %d, Printing Demod Buffer:", idx, 128);
                printDemodBuff();
        }
        return 1;
}

// FDX-B ISO11784/85 demod  (aka animal tag)  BIPHASE, inverted, rf/32,  with preamble of 00000000001 (128bits)
// 8 databits + 1 parity (1)
// CIITT 16 chksum
// NATIONAL CODE, ICAR database
// COUNTRY CODE (ISO3166) or http://cms.abvma.ca/uploads/ManufacturersISOsandCountryCodes.pdf
// FLAG (animal/non-animal)
/*
38 IDbits   
10 country code 
1 extra app bit
14 reserved bits
1 animal bit
16 ccitt CRC chksum over 64bit ID CODE.
24 appli bits.

-- sample: 985121004515220  [ 37FF65B88EF94 ]
*/
int CmdFDXBdemodBI(const char *Cmd){

        int invert = 1;
        int clk = 32;           
        int errCnt = 0;
        int maxErr = 0;
        uint8_t BitStream[MAX_DEMOD_BUF_LEN];   
        size_t size = getFromGraphBuf(BitStream);       
        
        errCnt = askdemod(BitStream, &size, &clk, &invert, maxErr, 0, 0);
        if ( errCnt < 0 || errCnt > maxErr ) { 
                if (g_debugMode) PrintAndLog("DEBUG: no data or error found %d, clock: %d", errCnt, clk);
                return 0;
        }

        errCnt = BiphaseRawDecode(BitStream, &size, maxErr, 1);
        if (errCnt < 0 || errCnt > maxErr ) {
                if (g_debugMode) PrintAndLog("Error BiphaseRawDecode: %d", errCnt);
                return 0;
        } 
        
        int preambleIndex = FDXBdemodBI(BitStream, &size);
        if (preambleIndex < 0){
                if (g_debugMode) PrintAndLog("Error FDXBDemod , no startmarker found :: %d",preambleIndex);
                return 0;
        }
        
        setDemodBuf(BitStream, 128, preambleIndex);

        // remove but don't verify parity. (pType = 2)
        size = removeParity(BitStream, preambleIndex + 11, 9, 2, 117);
        if ( size <= 103 ) {
                if (g_debugMode) PrintAndLog("Error removeParity:: %d", size);
                return 0;
        }
        if (g_debugMode) {
                char *bin = sprint_bin_break(BitStream,size,16);
                PrintAndLog("DEBUG BinStream:\n%s",bin);
        }
        PrintAndLog("\nFDX-B / ISO 11784/5 Animal Tag ID Found:");
        if (g_debugMode) PrintAndLog("Start marker %d;   Size %d", preambleIndex, size);

        //got a good demod
        uint64_t NationalCode = ((uint64_t)(bytebits_to_byteLSBF(BitStream+32,6)) << 32) | bytebits_to_byteLSBF(BitStream,32);
        uint32_t countryCode = bytebits_to_byteLSBF(BitStream+38,10);
        uint8_t dataBlockBit = BitStream[48];
        uint32_t reservedCode = bytebits_to_byteLSBF(BitStream+49,14);
        uint8_t animalBit = BitStream[63];
        uint32_t crc16 = bytebits_to_byteLSBF(BitStream+64,16);
        uint32_t extended = bytebits_to_byteLSBF(BitStream+80,24);

        uint64_t rawid = ((uint64_t)bytebits_to_byte(BitStream,32)<<32) | bytebits_to_byte(BitStream+32,32);
        uint8_t raw[8];
        num_to_bytes(rawid, 8, raw);

        if (g_debugMode) PrintAndLog("Raw ID Hex: %s", sprint_hex(raw,8));

        uint16_t calcCrc = crc16_ccitt_kermit(raw, 8);
        PrintAndLog("Animal ID:     %04u-%012llu", countryCode, NationalCode);
        PrintAndLog("National Code: %012llu", NationalCode);
        PrintAndLog("CountryCode:   %04u", countryCode);
        PrintAndLog("Extended Data: %s", dataBlockBit ? "True" : "False");
        PrintAndLog("reserved Code: %u", reservedCode);
        PrintAndLog("Animal Tag:    %s", animalBit ? "True" : "False");
        PrintAndLog("CRC:           0x%04X - [%04X] - %s", crc16, calcCrc, (calcCrc == crc16) ? "Passed" : "Failed");
        PrintAndLog("Extended:      0x%X\n", extended);
        
        return 1;
}


//by marshmellow
//attempt to psk1 demod graph buffer
int PSKDemod(const char *Cmd, bool verbose)
{
        int invert=0;
        int clk=0;
        int maxErr=100;
        sscanf(Cmd, "%i %i %i", &clk, &invert, &maxErr);
        if (clk==1){
                invert=1;
                clk=0;
        }
        if (invert != 0 && invert != 1) {
                if (g_debugMode || verbose) PrintAndLog("Invalid argument: %s", Cmd);
                return 0;
        }
        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        size_t BitLen = getFromGraphBuf(BitStream);
        if (BitLen==0) return 0;
        uint8_t carrier=countFC(BitStream, BitLen, 0);
        if (carrier!=2 && carrier!=4 && carrier!=8){
                //invalid carrier
                return 0;
        }
        int errCnt=0;
        errCnt = pskRawDemod(BitStream, &BitLen, &clk, &invert);
        if (errCnt > maxErr){
                if (g_debugMode || verbose) PrintAndLog("Too many errors found, clk: %d, invert: %d, numbits: %d, errCnt: %d",clk,invert,BitLen,errCnt);
                return 0;
        } 
        if (errCnt<0|| BitLen<16){  //throw away static - allow 1 and -1 (in case of threshold command first)
                if (g_debugMode || verbose) PrintAndLog("no data found, clk: %d, invert: %d, numbits: %d, errCnt: %d",clk,invert,BitLen,errCnt);
                return 0;
        }
        if (verbose || g_debugMode){
                PrintAndLog("\nUsing Clock:%d, invert:%d, Bits Found:%d",clk,invert,BitLen);
                if (errCnt>0){
                        PrintAndLog("# Errors during Demoding (shown as 7 in bit stream): %d",errCnt);
                }
        }
        //prime demod buffer for output
        setDemodBuf(BitStream,BitLen,0);
        return 1;
}

// Indala 26 bit decode
// by marshmellow
// optional arguments - same as CmdpskNRZrawDemod (clock & invert)
int CmdIndalaDecode(const char *Cmd)
{
        int ans;
        if (strlen(Cmd)>0){
                ans = PSKDemod(Cmd, 0);
        } else{ //default to RF/32
                ans = PSKDemod("32", 0);
        }

        if (!ans){
                if (g_debugMode==1) 
                        PrintAndLog("Error1: %d",ans);
                return 0;
        }
        uint8_t invert=0;
        ans = indala26decode(DemodBuffer, &DemodBufferLen, &invert);
        if (ans < 1) {
                if (g_debugMode==1)
                        PrintAndLog("Error2: %d",ans);
                return -1;
        }
        char showbits[251]={0x00};
        if (invert)
                if (g_debugMode==1)
                        PrintAndLog("Had to invert bits");

        //convert UID to HEX
        uint32_t uid1, uid2, uid3, uid4, uid5, uid6, uid7;
        int idx;
        uid1=0;
        uid2=0;
        PrintAndLog("BitLen: %d",DemodBufferLen);
        if (DemodBufferLen==64){
                for( idx=0; idx<64; idx++) {
                        uid1=(uid1<<1)|(uid2>>31);
                        if (DemodBuffer[idx] == 0) {
                                uid2=(uid2<<1)|0;
                                showbits[idx]='0';
                        } else {
                                uid2=(uid2<<1)|1;
                                showbits[idx]='1';
                        }
                }
                showbits[idx]='\0';
                PrintAndLog("Indala UID=%s (%x%08x)", showbits, uid1, uid2);
        }
        else {
                uid3=0;
                uid4=0;
                uid5=0;
                uid6=0;
                uid7=0;
                for( idx=0; idx<DemodBufferLen; idx++) {
                        uid1=(uid1<<1)|(uid2>>31);
                        uid2=(uid2<<1)|(uid3>>31);
                        uid3=(uid3<<1)|(uid4>>31);
                        uid4=(uid4<<1)|(uid5>>31);
                        uid5=(uid5<<1)|(uid6>>31);
                        uid6=(uid6<<1)|(uid7>>31);
                        if (DemodBuffer[idx] == 0) {
                                uid7=(uid7<<1)|0;
                                showbits[idx]='0';
                        }
                        else {
                                uid7=(uid7<<1)|1;
                                showbits[idx]='1';
                        }
                }
                showbits[idx]='\0';
                PrintAndLog("Indala UID=%s (%x%08x%08x%08x%08x%08x%08x)", showbits, uid1, uid2, uid3, uid4, uid5, uid6, uid7);
        }
        if (g_debugMode){
                PrintAndLog("DEBUG: printing demodbuffer:");
                printDemodBuff();
        }
        return 1;
}

int CmdPSKNexWatch(const char *Cmd)
{
        if (!PSKDemod("", false)) return 0;
        uint8_t preamble[28] = {0,0,0,0,0,1,0,1,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
        size_t startIdx = 0, size = DemodBufferLen; 
        bool invert = false;
        if (!preambleSearch(DemodBuffer, preamble, sizeof(preamble), &size, &startIdx)){
                // if didn't find preamble try again inverting
                if (!PSKDemod("1", false)) return 0; 
                size = DemodBufferLen;
                if (!preambleSearch(DemodBuffer, preamble, sizeof(preamble), &size, &startIdx)) return 0;
                invert = true;
        } 
        if (size != 128) return 0;
        setDemodBuf(DemodBuffer, size, startIdx+4);
        startIdx = 8+32; //4 = extra i added, 8 = preamble, 32 = reserved bits (always 0)
        //get ID
        uint32_t ID = 0;
        for (uint8_t wordIdx=0; wordIdx<4; wordIdx++){
                for (uint8_t idx=0; idx<8; idx++){
                        ID = (ID << 1) | DemodBuffer[startIdx+wordIdx+(idx*4)];
                }       
        }
        //parity check (TBD)

        //checksum check (TBD)

        //output
        PrintAndLog("NexWatch ID: %d", ID);
        if (invert){
                PrintAndLog("Had to Invert - probably NexKey");
                for (uint8_t idx=0; idx<size; idx++)
                        DemodBuffer[idx] ^= 1;
        } 

        CmdPrintDemodBuff("x");
        return 1;
}

// by marshmellow
// takes 3 arguments - clock, invert, maxErr as integers
// attempts to demodulate nrz only
// prints binary found and saves in demodbuffer for further commands
int NRZrawDemod(const char *Cmd, bool verbose)
{
        int invert=0;
        int clk=0;
        int maxErr=100;
        sscanf(Cmd, "%i %i %i", &clk, &invert, &maxErr);
        if (clk==1){
                invert=1;
                clk=0;
        }
        if (invert != 0 && invert != 1) {
                PrintAndLog("Invalid argument: %s", Cmd);
                return 0;
        }
        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        size_t BitLen = getFromGraphBuf(BitStream);
        if (BitLen==0) return 0;
        int errCnt=0;
        errCnt = nrzRawDemod(BitStream, &BitLen, &clk, &invert, maxErr);
        if (errCnt > maxErr){
                if (g_debugMode) PrintAndLog("Too many errors found, clk: %d, invert: %d, numbits: %d, errCnt: %d",clk,invert,BitLen,errCnt);
                return 0;
        } 
        if (errCnt<0 || BitLen<16){  //throw away static - allow 1 and -1 (in case of threshold command first)
                if (g_debugMode) PrintAndLog("no data found, clk: %d, invert: %d, numbits: %d, errCnt: %d",clk,invert,BitLen,errCnt);
                return 0;
        }
        if (verbose || g_debugMode) PrintAndLog("Tried NRZ Demod using Clock: %d - invert: %d - Bits Found: %d",clk,invert,BitLen);
        //prime demod buffer for output
        setDemodBuf(BitStream,BitLen,0);

        if (errCnt>0 && (verbose || g_debugMode)) PrintAndLog("# Errors during Demoding (shown as 7 in bit stream): %d",errCnt);
        if (verbose || g_debugMode) {
                PrintAndLog("NRZ demoded bitstream:");
                // Now output the bitstream to the scrollback by line of 16 bits
                printDemodBuff();
        }
        return 1; 
}

int CmdNRZrawDemod(const char *Cmd)
{
        char cmdp = param_getchar(Cmd, 0);
        if (strlen(Cmd) > 10 || cmdp == 'h' || cmdp == 'H') {
                PrintAndLog("Usage:  data rawdemod nr [clock] <0|1> [maxError]");
                PrintAndLog("     [set clock as integer] optional, if not set, autodetect.");
                PrintAndLog("     <invert>, 1 for invert output");
                PrintAndLog("     [set maximum allowed errors], default = 100.");
                PrintAndLog("");
                PrintAndLog("    sample: data rawdemod nr        = demod a nrz/direct tag from GraphBuffer");
                PrintAndLog("          : data rawdemod nr 32     = demod a nrz/direct tag from GraphBuffer using a clock of RF/32");
                PrintAndLog("          : data rawdemod nr 32 1   = demod a nrz/direct tag from GraphBuffer using a clock of RF/32 and inverting data");
                PrintAndLog("          : data rawdemod nr 1      = demod a nrz/direct tag from GraphBuffer while inverting data");
                PrintAndLog("          : data rawdemod nr 64 1 0 = demod a nrz/direct tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
                return 0;
        }
        return NRZrawDemod(Cmd, TRUE);
}

// by marshmellow
// takes 3 arguments - clock, invert, maxErr as integers
// attempts to demodulate psk only
// prints binary found and saves in demodbuffer for further commands
int CmdPSK1rawDemod(const char *Cmd)
{
        int ans;
        char cmdp = param_getchar(Cmd, 0);
        if (strlen(Cmd) > 10 || cmdp == 'h' || cmdp == 'H') {
                PrintAndLog("Usage:  data rawdemod p1 [clock] <0|1> [maxError]");
                PrintAndLog("     [set clock as integer] optional, if not set, autodetect.");
                PrintAndLog("     <invert>, 1 for invert output");
                PrintAndLog("     [set maximum allowed errors], default = 100.");
                PrintAndLog("");
                PrintAndLog("    sample: data rawdemod p1        = demod a psk1 tag from GraphBuffer");
                PrintAndLog("          : data rawdemod p1 32     = demod a psk1 tag from GraphBuffer using a clock of RF/32");
                PrintAndLog("          : data rawdemod p1 32 1   = demod a psk1 tag from GraphBuffer using a clock of RF/32 and inverting data");
                PrintAndLog("          : data rawdemod p1 1      = demod a psk1 tag from GraphBuffer while inverting data");
                PrintAndLog("          : data rawdemod p1 64 1 0 = demod a psk1 tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
                return 0;
        }
        ans = PSKDemod(Cmd, TRUE);
        //output
        if (!ans){
                if (g_debugMode) PrintAndLog("Error demoding: %d",ans); 
                return 0;
        }
 
        PrintAndLog("PSK1 demoded bitstream:");
        // Now output the bitstream to the scrollback by line of 16 bits
        printDemodBuff();
        return 1;
}

// by marshmellow
// takes same args as cmdpsk1rawdemod
int CmdPSK2rawDemod(const char *Cmd)
{
        int ans=0;
        char cmdp = param_getchar(Cmd, 0);
        if (strlen(Cmd) > 10 || cmdp == 'h' || cmdp == 'H') {
                PrintAndLog("Usage:  data rawdemod p2 [clock] <0|1> [maxError]");
                PrintAndLog("     [set clock as integer] optional, if not set, autodetect.");
                PrintAndLog("     <invert>, 1 for invert output");
                PrintAndLog("     [set maximum allowed errors], default = 100.");
                PrintAndLog("");
                PrintAndLog("    sample: data rawdemod p2         = demod a psk2 tag from GraphBuffer, autodetect clock");
                PrintAndLog("          : data rawdemod p2 32      = demod a psk2 tag from GraphBuffer using a clock of RF/32");
                PrintAndLog("          : data rawdemod p2 32 1    = demod a psk2 tag from GraphBuffer using a clock of RF/32 and inverting output");
                PrintAndLog("          : data rawdemod p2 1       = demod a psk2 tag from GraphBuffer, autodetect clock and invert output");
                PrintAndLog("          : data rawdemod p2 64 1 0  = demod a psk2 tag from GraphBuffer using a clock of RF/64, inverting output and allowing 0 demod errors");
                return 0;
        }
        ans=PSKDemod(Cmd, TRUE);
        if (!ans){
                if (g_debugMode) PrintAndLog("Error demoding: %d",ans);  
                return 0;
        } 
        psk1TOpsk2(DemodBuffer, DemodBufferLen);
        PrintAndLog("PSK2 demoded bitstream:");
        // Now output the bitstream to the scrollback by line of 16 bits
        printDemodBuff();  
        return 1;
}

// by marshmellow - combines all raw demod functions into one menu command
int CmdRawDemod(const char *Cmd)
{
        char cmdp = Cmd[0]; //param_getchar(Cmd, 0);

        if (strlen(Cmd) > 20 || cmdp == 'h' || cmdp == 'H' || strlen(Cmd)<2) {
                PrintAndLog("Usage:  data rawdemod [modulation] <help>|<options>");
                PrintAndLog("   [modulation] as 2 char, 'ab' for ask/biphase, 'am' for ask/manchester, 'ar' for ask/raw, 'fs' for fsk, ...");           
                PrintAndLog("         'nr' for nrz/direct, 'p1' for psk1, 'p2' for psk2");
                PrintAndLog("   <help> as 'h', prints the help for the specific modulation");   
                PrintAndLog("   <options> see specific modulation help for optional parameters");                               
                PrintAndLog("");
                PrintAndLog("    sample: data rawdemod fs h         = print help specific to fsk demod");
                PrintAndLog("          : data rawdemod fs           = demod GraphBuffer using: fsk - autodetect");
                PrintAndLog("          : data rawdemod ab           = demod GraphBuffer using: ask/biphase - autodetect");
                PrintAndLog("          : data rawdemod am           = demod GraphBuffer using: ask/manchester - autodetect");
                PrintAndLog("          : data rawdemod ar           = demod GraphBuffer using: ask/raw - autodetect");
                PrintAndLog("          : data rawdemod nr           = demod GraphBuffer using: nrz/direct - autodetect");
                PrintAndLog("          : data rawdemod p1           = demod GraphBuffer using: psk1 - autodetect");
                PrintAndLog("          : data rawdemod p2           = demod GraphBuffer using: psk2 - autodetect");
                return 0;
        }
        char cmdp2 = Cmd[1];
        int ans = 0;
        if (cmdp == 'f' && cmdp2 == 's'){
                ans = CmdFSKrawdemod(Cmd+2);
        } else if(cmdp == 'a' && cmdp2 == 'b'){
                ans = Cmdaskbiphdemod(Cmd+2);
        } else if(cmdp == 'a' && cmdp2 == 'm'){
                ans = Cmdaskmandemod(Cmd+2);
        } else if(cmdp == 'a' && cmdp2 == 'r'){
                ans = Cmdaskrawdemod(Cmd+2);
        } else if(cmdp == 'n' && cmdp2 == 'r'){
                ans = CmdNRZrawDemod(Cmd+2);
        } else if(cmdp == 'p' && cmdp2 == '1'){
                ans = CmdPSK1rawDemod(Cmd+2);
        } else if(cmdp == 'p' && cmdp2 == '2'){
                ans = CmdPSK2rawDemod(Cmd+2);
        } else { 
                PrintAndLog("unknown modulation entered - see help ('h') for parameter structure");
        }
        return ans;
}

int CmdGrid(const char *Cmd)
{
        sscanf(Cmd, "%i %i", &PlotGridX, &PlotGridY);
        PlotGridXdefault= PlotGridX;
        PlotGridYdefault= PlotGridY;
        RepaintGraphWindow();
        return 0;
}

int CmdHexsamples(const char *Cmd)
{
        int i, j;
        int requested = 0;
        int offset = 0;
        char string_buf[25];
        char* string_ptr = string_buf;
        uint8_t got[BIGBUF_SIZE];

        sscanf(Cmd, "%i %i", &requested, &offset);

        /* if no args send something */
        if (requested == 0) {
                requested = 8;
        }
        if (offset + requested > sizeof(got)) {
                PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > %d", BIGBUF_SIZE);
                return 0;
        }

        GetFromBigBuf(got,requested,offset);
        WaitForResponse(CMD_ACK,NULL);

        i = 0;
        for (j = 0; j < requested; j++) {
                i++;
                string_ptr += sprintf(string_ptr, "%02x ", got[j]);
                if (i == 8) {
                        *(string_ptr - 1) = '\0';    // remove the trailing space
                        PrintAndLog("%s", string_buf);
                        string_buf[0] = '\0';
                        string_ptr = string_buf;
                        i = 0;
                }
                if (j == requested - 1 && string_buf[0] != '\0') { // print any remaining bytes
                        *(string_ptr - 1) = '\0';
                        PrintAndLog("%s", string_buf);
                        string_buf[0] = '\0';
                }
        }
        return 0;
}

int CmdHide(const char *Cmd)
{
        HideGraphWindow();
        return 0;
}

//zero mean GraphBuffer
int CmdHpf(const char *Cmd)
{
        int i;
        int accum = 0;

        for (i = 10; i < GraphTraceLen; ++i)
                accum += GraphBuffer[i];
        accum /= (GraphTraceLen - 10);
        for (i = 0; i < GraphTraceLen; ++i)
                GraphBuffer[i] -= accum;

        RepaintGraphWindow();
        return 0;
}
typedef struct {
        uint8_t * buffer;
        uint32_t numbits;
        uint32_t position;
} BitstreamOut;

bool _headBit( BitstreamOut *stream)
{
        int bytepos = stream->position >> 3; // divide by 8
        int bitpos = (stream->position++) & 7; // mask out 00000111
        return (*(stream->buffer + bytepos) >> (7-bitpos)) & 1;
}

uint8_t getByte(uint8_t bits_per_sample, BitstreamOut* b)
{
        int i;
        uint8_t val = 0;
        for(i =0 ; i < bits_per_sample; i++)
        {
                val |= (_headBit(b) << (7-i));
        }
        return val;
}

int getSamples(const char *Cmd, bool silent)
{
        //If we get all but the last byte in bigbuf,
        // we don't have to worry about remaining trash
        // in the last byte in case the bits-per-sample
        // does not line up on byte boundaries

        uint8_t got[BIGBUF_SIZE-1] = { 0 };

        int n = strtol(Cmd, NULL, 0);

        if (n == 0)
                n = sizeof(got);

        if (n > sizeof(got))
                n = sizeof(got);

        PrintAndLog("Reading %d bytes from device memory\n", n);
        GetFromBigBuf(got,n,0);
        PrintAndLog("Data fetched");
        UsbCommand response;
        WaitForResponse(CMD_ACK, &response);
        uint8_t bits_per_sample = 8;

        //Old devices without this feature would send 0 at arg[0]
        if(response.arg[0] > 0)
        {
                sample_config *sc = (sample_config *) response.d.asBytes;
                PrintAndLog("Samples @ %d bits/smpl, decimation 1:%d ", sc->bits_per_sample
                    , sc->decimation);
                bits_per_sample = sc->bits_per_sample;
        }
        if(bits_per_sample < 8)
        {
                PrintAndLog("Unpacking...");
                BitstreamOut bout = { got, bits_per_sample * n,  0};
                int j =0;
                for (j = 0; j * bits_per_sample < n * 8 && j < n; j++) {
                        uint8_t sample = getByte(bits_per_sample, &bout);
                        GraphBuffer[j] = ((int) sample )- 128;
                }
                GraphTraceLen = j;
                PrintAndLog("Unpacked %d samples" , j );
        }else
        {
                for (int j = 0; j < n; j++) {
                        GraphBuffer[j] = ((int)got[j]) - 128;
                }
                GraphTraceLen = n;
        }

        RepaintGraphWindow();
        return 0;
}

int CmdSamples(const char *Cmd)
{
        return getSamples(Cmd, false);
}

int CmdTuneSamples(const char *Cmd)
{
        int timeout = 0;
        printf("\nMeasuring antenna characteristics, please wait...");

        UsbCommand c = {CMD_MEASURE_ANTENNA_TUNING};
        SendCommand(&c);

        UsbCommand resp;
        while(!WaitForResponseTimeout(CMD_MEASURED_ANTENNA_TUNING,&resp,1000)) {
                timeout++;
                printf(".");
                if (timeout > 7) {
                        PrintAndLog("\nNo response from Proxmark. Aborting...");
                        return 1;
                }
        }

        int peakv, peakf;
        int vLf125, vLf134, vHf;
        vLf125 = resp.arg[0] & 0xffff;
        vLf134 = resp.arg[0] >> 16;
        vHf = resp.arg[1] & 0xffff;;
        peakf = resp.arg[2] & 0xffff;
        peakv = resp.arg[2] >> 16;
        PrintAndLog("");
        PrintAndLog("# LF antenna: %5.2f V @   125.00 kHz", vLf125/1000.0);
        PrintAndLog("# LF antenna: %5.2f V @   134.00 kHz", vLf134/1000.0);
        PrintAndLog("# LF optimal: %5.2f V @%9.2f kHz", peakv/1000.0, 12000.0/(peakf+1));
        PrintAndLog("# HF antenna: %5.2f V @    13.56 MHz", vHf/1000.0);

 #define LF_UNUSABLE_V          2948            // was 2000. Changed due to bugfix in voltage measurements. LF results are now 47% higher.
 #define LF_MARGINAL_V          14739           // was 10000. Changed due to bugfix bug in voltage measurements. LF results are now 47% higher.
 #define HF_UNUSABLE_V          3167            // was 2000. Changed due to bugfix in voltage measurements. HF results are now 58% higher.
 #define HF_MARGINAL_V          7917            // was 5000. Changed due to bugfix in voltage measurements. HF results are now 58% higher.

        if (peakv < LF_UNUSABLE_V)
                PrintAndLog("# Your LF antenna is unusable.");
        else if (peakv < LF_MARGINAL_V)
                PrintAndLog("# Your LF antenna is marginal.");
        if (vHf < HF_UNUSABLE_V)
                PrintAndLog("# Your HF antenna is unusable.");
        else if (vHf < HF_MARGINAL_V)
                PrintAndLog("# Your HF antenna is marginal.");

        if (peakv >= LF_UNUSABLE_V)     {
                for (int i = 0; i < 256; i++) {
                        GraphBuffer[i] = resp.d.asBytes[i] - 128;
                }
                PrintAndLog("Displaying LF tuning graph. Divisor 89 is 134khz, 95 is 125khz.\n");
                PrintAndLog("\n");
                GraphTraceLen = 256;
                ShowGraphWindow();
                RepaintGraphWindow();
        }

        return 0;
}


int CmdLoad(const char *Cmd)
{
        char filename[FILE_PATH_SIZE] = {0x00};
        int len = 0;

        len = strlen(Cmd);
        if (len > FILE_PATH_SIZE) len = FILE_PATH_SIZE;
        memcpy(filename, Cmd, len);
        
        FILE *f = fopen(filename, "r");
        if (!f) {
                 PrintAndLog("couldn't open '%s'", filename);
                return 0;
        }

        GraphTraceLen = 0;
        char line[80];
        while (fgets(line, sizeof (line), f)) {
                GraphBuffer[GraphTraceLen] = atoi(line);
                GraphTraceLen++;
        }
        fclose(f);
        PrintAndLog("loaded %d samples", GraphTraceLen);
        RepaintGraphWindow();
        return 0;
}

int CmdLtrim(const char *Cmd)
{
        int ds = atoi(Cmd);
        if (GraphTraceLen<=0) return 0;
        for (int i = ds; i < GraphTraceLen; ++i)
                GraphBuffer[i-ds] = GraphBuffer[i];
        GraphTraceLen -= ds;

        RepaintGraphWindow();
        return 0;
}

// trim graph to input argument length
int CmdRtrim(const char *Cmd)
{
        int ds = atoi(Cmd);

        GraphTraceLen = ds;

        RepaintGraphWindow();
        return 0;
}

int CmdNorm(const char *Cmd)
{
        int i;
        int max = INT_MIN, min = INT_MAX;

        for (i = 10; i < GraphTraceLen; ++i) {
                if (GraphBuffer[i] > max)
                        max = GraphBuffer[i];
                if (GraphBuffer[i] < min)
                        min = GraphBuffer[i];
        }

        if (max != min) {
                for (i = 0; i < GraphTraceLen; ++i) {
                        GraphBuffer[i] = (GraphBuffer[i] - ((max + min) / 2)) * 256 /
                                (max - min);
                                //marshmelow: adjusted *1000 to *256 to make +/- 128 so demod commands still work
                }
        }
        RepaintGraphWindow();
        return 0;
}

int CmdPlot(const char *Cmd)
{
        ShowGraphWindow();
        return 0;
}

int CmdSave(const char *Cmd)
{
        char filename[FILE_PATH_SIZE] = {0x00};
        int len = 0;

        len = strlen(Cmd);
        if (len > FILE_PATH_SIZE) len = FILE_PATH_SIZE;
        memcpy(filename, Cmd, len);
         

        FILE *f = fopen(filename, "w");
        if(!f) {
                PrintAndLog("couldn't open '%s'", filename);
                return 0;
        }
        int i;
        for (i = 0; i < GraphTraceLen; i++) {
                fprintf(f, "%d\n", GraphBuffer[i]);
        }
        fclose(f);
        PrintAndLog("saved to '%s'", Cmd);
        return 0;
}

int CmdScale(const char *Cmd)
{
        CursorScaleFactor = atoi(Cmd);
        if (CursorScaleFactor == 0) {
                PrintAndLog("bad, can't have zero scale");
                CursorScaleFactor = 1;
        }
        RepaintGraphWindow();
        return 0;
}

int CmdDirectionalThreshold(const char *Cmd)
{
        int8_t upThres = param_get8(Cmd, 0);
        int8_t downThres = param_get8(Cmd, 1);

        printf("Applying Up Threshold: %d, Down Threshold: %d\n", upThres, downThres);

        int lastValue = GraphBuffer[0];
        GraphBuffer[0] = 0; // Will be changed at the end, but init 0 as we adjust to last samples value if no threshold kicks in.

        for (int i = 1; i < GraphTraceLen; ++i) {
                // Apply first threshold to samples heading up
                if (GraphBuffer[i] >= upThres && GraphBuffer[i] > lastValue)
                {
                        lastValue = GraphBuffer[i]; // Buffer last value as we overwrite it.
                        GraphBuffer[i] = 1;
                }
                // Apply second threshold to samples heading down
                else if (GraphBuffer[i] <= downThres && GraphBuffer[i] < lastValue)
                {
                        lastValue = GraphBuffer[i]; // Buffer last value as we overwrite it.
                        GraphBuffer[i] = -1;
                }
                else
                {
                        lastValue = GraphBuffer[i]; // Buffer last value as we overwrite it.
                        GraphBuffer[i] = GraphBuffer[i-1];

                }
        }
        GraphBuffer[0] = GraphBuffer[1]; // Aline with first edited sample.
        RepaintGraphWindow();
        return 0;
}

int CmdZerocrossings(const char *Cmd)
{
        // Zero-crossings aren't meaningful unless the signal is zero-mean.
        CmdHpf("");

        int sign = 1;
        int zc = 0;
        int lastZc = 0;

        for (int i = 0; i < GraphTraceLen; ++i) {
                if (GraphBuffer[i] * sign >= 0) {
                        // No change in sign, reproduce the previous sample count.
                        zc++;
                        GraphBuffer[i] = lastZc;
                } else {
                        // Change in sign, reset the sample count.
                        sign = -sign;
                        GraphBuffer[i] = lastZc;
                        if (sign > 0) {
                                lastZc = zc;
                                zc = 0;
                        }
                }
        }

        RepaintGraphWindow();
        return 0;
}

static command_t CommandTable[] =
{
        {"help",            CmdHelp,            1, "This help"},
        {"askedgedetect",   CmdAskEdgeDetect,   1, "[threshold] Adjust Graph for manual ask demod using the length of sample differences to detect the edge of a wave (use 20-45, def:25)"},
        {"askem410xdemod",  CmdAskEM410xDemod,  1, "[clock] [invert<0|1>] [maxErr] -- Demodulate an EM410x tag from GraphBuffer (args optional)"},
        {"askgproxiidemod", CmdG_Prox_II_Demod, 1, "Demodulate a G Prox II tag from GraphBuffer"},
        {"autocorr",        CmdAutoCorr,        1, "[window length] [g] -- Autocorrelation over window - g to save back to GraphBuffer (overwrite)"},
        {"biphaserawdecode",CmdBiphaseDecodeRaw,1, "[offset] [invert<0|1>] [maxErr] -- Biphase decode bin stream in DemodBuffer (offset = 0|1 bits to shift the decode start)"},
        {"bitsamples",      CmdBitsamples,      0, "Get raw samples as bitstring"},
        {"buffclear",       CmdBuffClear,       1, "Clear sample buffer and graph window"},
        {"dec",             CmdDec,             1, "Decimate samples"},
        {"detectclock",     CmdDetectClockRate, 1, "[modulation] Detect clock rate of wave in GraphBuffer (options: 'a','f','n','p' for ask, fsk, nrz, psk respectively)"},
        {"fdxbdemod",       CmdFDXBdemodBI    , 1, "Demodulate a FDX-B ISO11784/85 Biphase tag from GraphBuffer"},
        {"fskawiddemod",    CmdFSKdemodAWID,    1, "Demodulate an AWID FSK tag from GraphBuffer"},
        //{"fskfcdetect",   CmdFSKfcDetect,     1, "Try to detect the Field Clock of an FSK wave"},
        {"fskhiddemod",     CmdFSKdemodHID,     1, "Demodulate a HID FSK tag from GraphBuffer"},
        {"fskiodemod",      CmdFSKdemodIO,      1, "Demodulate an IO Prox FSK tag from GraphBuffer"},
        {"fskpyramiddemod", CmdFSKdemodPyramid, 1, "Demodulate a Pyramid FSK tag from GraphBuffer"},
        {"fskparadoxdemod", CmdFSKdemodParadox, 1, "Demodulate a Paradox FSK tag from GraphBuffer"},
        {"getbitstream",    CmdGetBitStream,    1, "Convert GraphBuffer's >=1 values to 1 and <1 to 0"},
        {"grid",            CmdGrid,            1, "<x> <y> -- overlay grid on graph window, use zero value to turn off either"},
        {"hexsamples",      CmdHexsamples,      0, "<bytes> [<offset>] -- Dump big buffer as hex bytes"},
        {"hide",            CmdHide,            1, "Hide graph window"},
        {"hpf",             CmdHpf,             1, "Remove DC offset from trace"},
        {"load",            CmdLoad,            1, "<filename> -- Load trace (to graph window"},
        {"ltrim",           CmdLtrim,           1, "<samples> -- Trim samples from left of trace"},
        {"rtrim",           CmdRtrim,           1, "<location to end trace> -- Trim samples from right of trace"},
        {"manrawdecode",    Cmdmandecoderaw,    1, "[invert] [maxErr] -- Manchester decode binary stream in DemodBuffer"},
        {"norm",            CmdNorm,            1, "Normalize max/min to +/-128"},
        {"plot",            CmdPlot,            1, "Show graph window (hit 'h' in window for keystroke help)"},
        {"printdemodbuffer",CmdPrintDemodBuff,  1, "[x] [o] <offset> -- print the data in the DemodBuffer - 'x' for hex output"},
        {"pskindalademod",  CmdIndalaDecode,    1, "[clock] [invert<0|1>] -- Demodulate an indala tag (PSK1) from GraphBuffer (args optional)"},
        {"psknexwatchdemod",CmdPSKNexWatch,     1, "Demodulate a NexWatch tag (nexkey, quadrakey) (PSK1) from GraphBuffer"},
        {"rawdemod",        CmdRawDemod,        1, "[modulation] ... <options> -see help (h option) -- Demodulate the data in the GraphBuffer and output binary"},  
        {"samples",         CmdSamples,         0, "[512 - 40000] -- Get raw samples for graph window (GraphBuffer)"},
        {"save",            CmdSave,            1, "<filename> -- Save trace (from graph window)"},
        {"scale",           CmdScale,           1, "<int> -- Set cursor display scale"},
        {"setdebugmode",    CmdSetDebugMode,    1, "<0|1> -- Turn on or off Debugging Mode for demods"},
        {"shiftgraphzero",  CmdGraphShiftZero,  1, "<shift> -- Shift 0 for Graphed wave + or - shift value"},
        {"dirthreshold",    CmdDirectionalThreshold,   1, "<thres up> <thres down> -- Max rising higher up-thres/ Min falling lower down-thres, keep rest as prev."},
        {"tune",            CmdTuneSamples,     0, "Get hw tune samples for graph window"},
        {"undec",           CmdUndec,           1, "Un-decimate samples by 2"},
        {"zerocrossings",   CmdZerocrossings,   1, "Count time between zero-crossings"},
        {NULL, NULL, 0, NULL}
};

int CmdData(const char *Cmd)
{
        CmdsParse(CommandTable, Cmd);
        return 0;
}

int CmdHelp(const char *Cmd)
{
        CmdsHelp(CommandTable);
        return 0;
}