proxmark3/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"

uint8_t DemodBuffer[MAX_DEMOD_BUF_LEN];
uint8_t g_debugMode;
int 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;
}

//by marshmellow
void printDemodBuff(void)
{
	uint32_t i = 0;
	int bitLen = DemodBufferLen;
	if (bitLen<16) {
		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

	// ensure equally divided by 16
	bitLen &= 0xfff0;

	for (i = 0; i <= (bitLen-16); i+=16) {
		PrintAndLog("%i%i%i%i%i%i%i%i%i%i%i%i%i%i%i%i",
		    DemodBuffer[i],
		    DemodBuffer[i+1],
		    DemodBuffer[i+2],
		    DemodBuffer[i+3],
		    DemodBuffer[i+4],
		    DemodBuffer[i+5],
		    DemodBuffer[i+6],
		    DemodBuffer[i+7],
		    DemodBuffer[i+8],
		    DemodBuffer[i+9],
		    DemodBuffer[i+10],
		    DemodBuffer[i+11],
		    DemodBuffer[i+12],
		    DemodBuffer[i+13],
		    DemodBuffer[i+14],
		    DemodBuffer[i+15]
		);
	}
	return;
}

int CmdPrintDemodBuff(const char *Cmd)
{
	char hex;
	char printBuff[512]={0x00};
	uint8_t numBits = DemodBufferLen & 0xFFF0;
	sscanf(Cmd, "%c", &hex);
	if (hex == 'h'){
		PrintAndLog("Usage: data printdemodbuffer [x]");
		PrintAndLog("Options:        ");
		PrintAndLog("       h       This help");
		PrintAndLog("       x       output in hex (omit for binary output)");
		return 0;
	}
	if (hex == 'x'){
		numBits = binarraytohex(printBuff, (char *)DemodBuffer, numBits);
		if (numBits==0) return 0;
		PrintAndLog("DemodBuffer: %s",printBuff);
	} else {
		printDemodBuff();
	}
	return 1;
}
int CmdAmp(const char *Cmd)
{
	int i, rising, falling;
	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) {
		rising = falling= 0;
		for (i = 0; i < GraphTraceLen; ++i) {
			if (GraphBuffer[i + 1] < GraphBuffer[i]) {
				if (rising) {
					GraphBuffer[i] = max;
					rising = 0;
				}
				falling = 1;
			}
			if (GraphBuffer[i + 1] > GraphBuffer[i]) {
				if (falling) {
					GraphBuffer[i] = min;
					falling = 0;
				}
				rising= 1;
			}
		}
	}
	RepaintGraphWindow();
	return 0;
}

/*
 * Generic command to demodulate ASK.
 *
 * Argument is convention: positive or negative (High mod means zero
 * or high mod means one)
 *
 * Updates the Graph trace with 0/1 values
 *
 * Arguments:
 * c : 0 or 1  (or invert)
 */
 //this method ignores the clock

 //this function strictly converts highs and lows to 1s and 0s for each sample in the graphbuffer
int Cmdaskdemod(const char *Cmd)
{
	int i;
	int c, high = 0, low = 0;

	sscanf(Cmd, "%i", &c);

	/* Detect high and lows */
	for (i = 0; i < GraphTraceLen; ++i)
	{
		if (GraphBuffer[i] > high)
			high = GraphBuffer[i];
		else if (GraphBuffer[i] < low)
			low = GraphBuffer[i];
	}
	high=abs(high*.75);
	low=abs(low*.75);
	if (c != 0 && c != 1) {
		PrintAndLog("Invalid argument: %s", Cmd);
		return 0;
	}
	//prime loop
	if (GraphBuffer[0] > 0) {
		GraphBuffer[0] = 1-c;
	} else {
		GraphBuffer[0] = c;
	}
	for (i = 1; i < GraphTraceLen; ++i) {
		/* Transitions are detected at each peak
		 * Transitions are either:
		 * - we're low: transition if we hit a high
		 * - we're high: transition if we hit a low
		 * (we need to do it this way because some tags keep high or
		 * low for long periods, others just reach the peak and go
		 * down)
		 */
		//[marhsmellow] change == to >= for high and <= for low for fuzz
		if ((GraphBuffer[i] >= high) && (GraphBuffer[i - 1] == c)) {
			GraphBuffer[i] = 1 - c;
		} else if ((GraphBuffer[i] <= low) && (GraphBuffer[i - 1] == (1 - c))){
			GraphBuffer[i] = c;
		} else {
			/* No transition */
			GraphBuffer[i] = GraphBuffer[i - 1];
		}
	}
	RepaintGraphWindow();
	return 0;
}

//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
void printBitStream(uint8_t BitStream[], uint32_t bitLen)
{
	uint32_t i = 0;
	if (bitLen<16) {
		PrintAndLog("Too few bits found: %d",bitLen);
		return;
	}
	if (bitLen>512) bitLen=512;

		// ensure equally divided by 16
	bitLen &= 0xfff0;


	for (i = 0; i <= (bitLen-16); i+=16) {
		PrintAndLog("%i%i%i%i%i%i%i%i%i%i%i%i%i%i%i%i",
		    BitStream[i],
		    BitStream[i+1],
		    BitStream[i+2],
		    BitStream[i+3],
		    BitStream[i+4],
		    BitStream[i+5],
		    BitStream[i+6],
		    BitStream[i+7],
		    BitStream[i+8],
		    BitStream[i+9],
		    BitStream[i+10],
		    BitStream[i+11],
		    BitStream[i+12],
		    BitStream[i+13],
		    BitStream[i+14],
		    BitStream[i+15]
		);
	}
	return;
}
//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 : %0d", 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      : 0x%X - %d", p1, p1);

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


int AskEm410xDemod(const char *Cmd, uint32_t *hi, uint64_t *lo)
{
	int ans = ASKmanDemod(Cmd, FALSE, FALSE);
	if (!ans) return 0;

	size_t idx=0;
	if (Em410xDecode(DemodBuffer,(size_t *) &DemodBufferLen, &idx, hi, lo)){
		if (g_debugMode){
			PrintAndLog("DEBUG: idx: %d, Len: %d, Printing Demod Buffer:", idx, DemodBufferLen);
			printDemodBuff();
		}
		return 1;
	}
	return 0;
}
//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;
	}
	uint32_t hi = 0;
	uint64_t lo = 0;
	if (AskEm410xDemod(Cmd, &hi, &lo)) {
		PrintAndLog("EM410x pattern found: ");
		printEM410x(hi, lo);
		return 1;
	}
	return 0;
}

int ASKmanDemod(const char *Cmd, bool verbose, bool emSearch)
{
	int invert=0;
	int clk=0;
	int maxErr=100;
	
	uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
	sscanf(Cmd, "%i %i %i", &clk, &invert, &maxErr);
	if (invert != 0 && invert != 1) {
		PrintAndLog("Invalid argument: %s", Cmd);
		return 0;
	}
	if (clk==1){
		invert=1;
		clk=0;
	}
	size_t BitLen = getFromGraphBuf(BitStream);
	if (g_debugMode==1) PrintAndLog("DEBUG: Bitlen from grphbuff: %d",BitLen);
	if (BitLen==0) return 0;
	int errCnt=0;
	errCnt = askmandemod(BitStream, &BitLen, &clk, &invert, maxErr);
	if (errCnt<0||BitLen<16){  //if fatal error (or -1)
		if (g_debugMode==1) PrintAndLog("no data found %d, errors:%d, bitlen:%d, clock:%d",errCnt,invert,BitLen,clk);
		return 0;
	}
	if (verbose || g_debugMode) PrintAndLog("\nUsing Clock: %d - Invert: %d - Bits Found: %d",clk,invert,BitLen);

	//output
	if (errCnt>0){
		if (verbose || g_debugMode) PrintAndLog("# Errors during Demoding (shown as 77 in bit stream): %d",errCnt);
	}
	if (verbose || g_debugMode) PrintAndLog("ASK/Manchester decoded bitstream:");
	// Now output the bitstream to the scrollback by line of 16 bits
	setDemodBuf(BitStream,BitLen,0);
	if (verbose || g_debugMode) printDemodBuff();
	uint64_t lo =0;
	uint32_t hi =0;
	size_t idx=0;
	if (emSearch){
		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: ");
			if (verbose) printEM410x(hi, lo);
			return 1;
		}
	}
	return 1;
}

//by marshmellow
//takes 3 arguments - clock, invert, maxErr as integers
//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) > 10 || cmdp == 'h' || cmdp == 'H') {
		PrintAndLog("Usage:  data rawdemod am [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 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 ASKmanDemod(Cmd, TRUE, TRUE);
}

//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;
	size_t maxErr = 20;
	char cmdp = param_getchar(Cmd, 0);
	if (strlen(Cmd) > 1 || cmdp == 'h' || cmdp == 'H') {
		PrintAndLog("Usage:  data manrawdecode");
		PrintAndLog("     Takes 10 and 01 and converts to 0 and 1 respectively");
		PrintAndLog("     --must have binary sequence in demodbuffer (run data askrawdemod first)");
		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>1 || low <0 ){
		PrintAndLog("Error: please raw demod the wave first then mancheseter raw decode");
		return 0;
	}
	size=i;
	errCnt=manrawdecode(BitStream, &size);
	if (errCnt>=maxErr){
		PrintAndLog("Too many errors: %d",errCnt);
		return 0;
	}
	PrintAndLog("Manchester Decoded - # errors:%d - data:",errCnt);
	printBitStream(BitStream, size);
	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
//  since it is not like manchester and doesn't have an incorrect bit pattern we
//  cannot determine if our decode is correct or if it should be shifted by one bit
//  the argument offset allows us to manually shift if the output is incorrect
//  (better would be to demod and decode at the same time so we can distinguish large
//    width waves vs small width waves to help the decode positioning) or askbiphdemod
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 77 in bit stream): %d",errCnt);
	}
	PrintAndLog("Biphase Decoded using offset: %d - # invert:%d - data:",offset,invert);
	printBitStream(BitStream, size);
	
	if (offset) setDemodBuf(DemodBuffer,DemodBufferLen-offset, offset);  //remove first bit from raw demod
	return 1;
}

// set demod buffer back to raw after biphase demod
void setBiphasetoRawDemodBuf(uint8_t *BitStream, size_t size)
{
	uint8_t rawStream[512]={0x00};
	size_t i=0;
	uint8_t curPhase=0;
	if (size > 256) {
		PrintAndLog("ERROR - Biphase Demod Buffer overrun");
		return;
	}
	for (size_t idx=0; idx<size; idx++){
		if(!BitStream[idx]){
			rawStream[i++] = curPhase;
			rawStream[i++] = curPhase;
			curPhase ^= 1; 
		} else {
			rawStream[i++] = curPhase;
			rawStream[i++] = curPhase ^ 1;
		}
	}
	setDemodBuf(rawStream,i,0);
	return;
}

//by marshmellow
//takes 4 arguments - clock, invert, maxErr as integers and amplify as char
//attempts to demodulate ask only
//prints binary found and saves in graphbuffer for further commands
int ASKrawDemod(const char *Cmd, bool verbose)
{
	int invert=0;
	int clk=0;
	int maxErr=100;
	uint8_t askAmp = 0;
	char amp = param_getchar(Cmd, 0);
	uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
	sscanf(Cmd, "%i %i %i %c", &clk, &invert, &maxErr, &amp);
	if (invert != 0 && invert != 1) {
		if (verbose || g_debugMode) 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 (BitLen==0) return 0;
	int errCnt=0;
	errCnt = askrawdemod(BitStream, &BitLen, &clk, &invert, maxErr, askAmp);
	if (errCnt==-1||BitLen<16){  //throw away static - allow 1 and -1 (in case of threshold command first)
		if (verbose || g_debugMode) PrintAndLog("no data found");
		if (g_debugMode) PrintAndLog("errCnt: %d, BitLen: %d, clk: %d, invert: %d", errCnt, BitLen, clk, invert);
		return 0;
	}
	if (verbose || g_debugMode) PrintAndLog("Using Clock: %d - invert: %d - Bits Found: %d", clk, invert, BitLen);
	
	//move BitStream back to DemodBuffer
	setDemodBuf(BitStream,BitLen,0);

	//output
	if (errCnt>0 && (verbose || g_debugMode)){
		PrintAndLog("# Errors during Demoding (shown as 77 in bit stream): %d", errCnt);
	}
	if (verbose || g_debugMode){
		PrintAndLog("ASK demoded bitstream:");
		// Now output the bitstream to the scrollback by line of 16 bits
		printBitStream(BitStream,BitLen);
	} 
	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, ans=0;
	ans = sscanf(Cmd, "%i %i %i %i", &offset, &clk, &invert, &maxErr);
	if (ans>0)
		ans = ASKrawDemod(Cmd+2, FALSE);
	else
		ans = ASKrawDemod(Cmd, FALSE);
	if (!ans) {
		if (g_debugMode || verbose) PrintAndLog("Error AskrawDemod: %d", ans);
		return 0;
	}

	//attempt to Biphase decode DemodBuffer
	size_t size = DemodBufferLen;
	uint8_t BitStream[MAX_DEMOD_BUF_LEN];
	memcpy(BitStream, DemodBuffer, DemodBufferLen); 

	int 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 - # errors:%d - data:",offset,errCnt);
		printDemodBuff();
	}
	return 1;
}
//by marshmellow - see ASKbiphaseDemod
int Cmdaskbiphdemod(const char *Cmd)
{
	char cmdp = param_getchar(Cmd, 0);
	if (strlen(Cmd) > 12 || cmdp == 'h' || cmdp == 'H') {
		PrintAndLog("Usage:  data rawdemod ab [offset] [clock] <invert> [maxError] <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("     <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 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 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 ASKrawDemod
int Cmdaskrawdemod(const char *Cmd)
{
	char cmdp = param_getchar(Cmd, 0);
	if (strlen(Cmd) > 12 || cmdp == 'h' || cmdp == 'H') {
		PrintAndLog("Usage:  data rawdemod ar [clock] <invert> [maxError] [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("     <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 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 ASKrawDemod(Cmd, TRUE);
}

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;
}

/*
 * Convert to a bitstream
 */
int CmdBitstream(const char *Cmd)
{
	int i, j;
	int bit;
	int gtl;
	int clock;
	int low = 0;
	int high = 0;
	int hithigh, hitlow, first;

	/* Detect high and lows and clock */
	for (i = 0; i < GraphTraceLen; ++i)
	{
		if (GraphBuffer[i] > high)
			high = GraphBuffer[i];
		else if (GraphBuffer[i] < low)
			low = GraphBuffer[i];
	}

	/* Get our clock */
	clock = GetAskClock(Cmd, high, 1);
	gtl = ClearGraph(0);

	bit = 0;
	for (i = 0; i < (int)(gtl / clock); ++i)
	{
		hithigh = 0;
		hitlow = 0;
		first = 1;
		/* Find out if we hit both high and low peaks */
		for (j = 0; j < clock; ++j)
		{
			if (GraphBuffer[(i * clock) + j] == high)
				hithigh = 1;
			else if (GraphBuffer[(i * clock) + j] == low)
				hitlow = 1;
			/* it doesn't count if it's the first part of our read
				 because it's really just trailing from the last sequence */
			if (first && (hithigh || hitlow))
				hithigh = hitlow = 0;
			else
				first = 0;

			if (hithigh && hitlow)
				break;
		}

		/* If we didn't hit both high and low peaks, we had a bit transition */
		if (!hithigh || !hitlow)
			bit ^= 1;

		AppendGraph(0, clock, bit);
	}

	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, and askdemod 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); 
	int shift = 127;
	int shiftedVal=0;
	for(int i = 1; i<GraphTraceLen; i++){
		if (GraphBuffer[i]-GraphBuffer[i-1]>=thresLen) //large jump up
			shift=127;
		else if(GraphBuffer[i]-GraphBuffer[i-1]<=-1*thresLen) //large jump down
			shift=-127;

		shiftedVal=GraphBuffer[i]+shift;

		if (shiftedVal>127) 
			shiftedVal=127;
		else if (shiftedVal<-127) 
			shiftedVal=-127;
		GraphBuffer[i-1] = shiftedVal;
	}
	RepaintGraphWindow();
	//CmdNorm("");
	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) > 3 || strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') {
		PrintAndLog("Usage:  data detectclock [modulation]");
		PrintAndLog("     [modulation as char], specify the modulation type you want to detect the clock of");
		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("", 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;
}

//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;
	}
	if (verbose) PrintAndLog("Args invert: %d - Clock:%d - fchigh:%d - fclow: %d",invert,rfLen,fchigh, fclow);
	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(size > (8*32)+2) size = (8*32)+2; //only output a max of 8 blocks of 32 bits  most tags will have full bit stream inside that sample size
		if (verbose) {
			PrintAndLog("FSK decoded bitstream:");
			printBitStream(BitStream,size);
		}

		return 1;
	} else{
		if (verbose) 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==1){
			PrintAndLog("DEBUG: IO Prox Data not found - FSK Bits: %d",BitLen);
			if (BitLen > 92) printBitStream(BitStream,92);
		} 
		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==1) 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);
		//PrintAndLog("%d", calccrc);
	}
	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;
}

int CmdFSKdemod(const char *Cmd) //old CmdFSKdemod needs updating
{
	static const int LowTone[]  = {
		1,  1,  1,  1,  1, -1, -1, -1, -1, -1,
		1,  1,  1,  1,  1, -1, -1, -1, -1, -1,
		1,  1,  1,  1,  1, -1, -1, -1, -1, -1,
		1,  1,  1,  1,  1, -1, -1, -1, -1, -1,
		1,  1,  1,  1,  1, -1, -1, -1, -1, -1
	};
	static const int HighTone[] = {
		1,  1,  1,  1,  1,     -1, -1, -1, -1,
		1,  1,  1,  1,         -1, -1, -1, -1,
		1,  1,  1,  1,         -1, -1, -1, -1,
		1,  1,  1,  1,         -1, -1, -1, -1,
		1,  1,  1,  1,         -1, -1, -1, -1,
		1,  1,  1,  1,     -1, -1, -1, -1, -1,
	};

	int lowLen = sizeof (LowTone) / sizeof (int);
	int highLen = sizeof (HighTone) / sizeof (int);
	int convLen = (highLen > lowLen) ? highLen : lowLen;
	uint32_t hi = 0, lo = 0;

	int i, j;
	int minMark = 0, maxMark = 0;

	for (i = 0; i < GraphTraceLen - convLen; ++i) {
		int lowSum = 0, highSum = 0;

		for (j = 0; j < lowLen; ++j) {
			lowSum += LowTone[j]*GraphBuffer[i+j];
		}
		for (j = 0; j < highLen; ++j) {
			highSum += HighTone[j] * GraphBuffer[i + j];
		}
		lowSum = abs(100 * lowSum / lowLen);
		highSum = abs(100 * highSum / highLen);
		GraphBuffer[i] = (highSum << 16) | lowSum;
	}

	for(i = 0; i < GraphTraceLen - convLen - 16; ++i) {
		int lowTot = 0, highTot = 0;
		// 10 and 8 are f_s divided by f_l and f_h, rounded
		for (j = 0; j < 10; ++j) {
			lowTot += (GraphBuffer[i+j] & 0xffff);
		}
		for (j = 0; j < 8; j++) {
			highTot += (GraphBuffer[i + j] >> 16);
		}
		GraphBuffer[i] = lowTot - highTot;
		if (GraphBuffer[i] > maxMark) maxMark = GraphBuffer[i];
		if (GraphBuffer[i] < minMark) minMark = GraphBuffer[i];
	}

	GraphTraceLen -= (convLen + 16);
	RepaintGraphWindow();

	// Find bit-sync (3 lo followed by 3 high) (HID ONLY)
	int max = 0, maxPos = 0;
	for (i = 0; i < 6000; ++i) {
		int dec = 0;
		for (j = 0; j < 3 * lowLen; ++j) {
			dec -= GraphBuffer[i + j];
		}
		for (; j < 3 * (lowLen + highLen ); ++j) {
			dec += GraphBuffer[i + j];
		}
		if (dec > max) {
			max = dec;
			maxPos = i;
		}
	}

	// place start of bit sync marker in graph
	GraphBuffer[maxPos] = maxMark;
	GraphBuffer[maxPos + 1] = minMark;

	maxPos += j;

	// place end of bit sync marker in graph
	GraphBuffer[maxPos] = maxMark;
	GraphBuffer[maxPos+1] = minMark;

	PrintAndLog("actual data bits start at sample %d", maxPos);
	PrintAndLog("length %d/%d", highLen, lowLen);

	uint8_t bits[46] = {0x00};

	// find bit pairs and manchester decode them
	for (i = 0; i < arraylen(bits) - 1; ++i) {
		int dec = 0;
		for (j = 0; j < lowLen; ++j) {
			dec -= GraphBuffer[maxPos + j];
		}
		for (; j < lowLen + highLen; ++j) {
			dec += GraphBuffer[maxPos + j];
		}
		maxPos += j;
		// place inter bit marker in graph
		GraphBuffer[maxPos] = maxMark;
		GraphBuffer[maxPos + 1] = minMark;

		// hi and lo form a 64 bit pair
		hi = (hi << 1) | (lo >> 31);
		lo = (lo << 1);
		// store decoded bit as binary (in hi/lo) and text (in bits[])
		if(dec < 0) {
			bits[i] = '1';
			lo |= 1;
		} else {
			bits[i] = '0';
		}
	}
	PrintAndLog("bits: '%s'", bits);
	PrintAndLog("hex: %08x %08x", hi, lo);
	return 0;
}

//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 (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 -1;
	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==1 && 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==1 && verbose) PrintAndLog("no data found, clk: %d, invert: %d, numbits: %d, errCnt: %d",clk,invert,BitLen,errCnt);
		return 0;
	}
	if (verbose){
		PrintAndLog("Tried PSK Demod using Clock: %d - invert: %d - Bits Found: %d",clk,invert,BitLen);
		if (errCnt>0){
			PrintAndLog("# Errors during Demoding (shown as 77 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,(size_t *) &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;
}

// 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 77 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("PSK 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) > 14 || 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+3);
	} else if(cmdp == 'a' && cmdp2 == 'b'){
		ans = Cmdaskbiphdemod(Cmd+3);
	} else if(cmdp == 'a' && cmdp2 == 'm'){
		ans = Cmdaskmandemod(Cmd+3);
	} else if(cmdp == 'a' && cmdp2 == 'r'){
		ans = Cmdaskrawdemod(Cmd+3);
	} else if(cmdp == 'n' && cmdp2 == 'r'){
		ans = CmdNRZrawDemod(Cmd+3);
	} else if(cmdp == 'p' && cmdp2 == '1'){
		ans = CmdPSK1rawDemod(Cmd+3);
	} else if(cmdp == 'p' && cmdp2 == '2'){
		ans = CmdPSK2rawDemod(Cmd+3);
	} 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 < sizeof(GraphBuffer); 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);

	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;
}

/*
 * Manchester demodulate a bitstream. The bitstream needs to be already in
 * the GraphBuffer as 0 and 1 values
 *
 * Give the clock rate as argument in order to help the sync - the algorithm
 * resyncs at each pulse anyway.
 *
 * Not optimized by any means, this is the 1st time I'm writing this type of
 * routine, feel free to improve...
 *
 * 1st argument: clock rate (as number of samples per clock rate)
 *               Typical values can be 64, 32, 128...
 */
int CmdManchesterDemod(const char *Cmd)
{
	int i, j, invert= 0;
	int bit;
	int clock;
	int lastval = 0;
	int low = 0;
	int high = 0;
	int hithigh, hitlow, first;
	int lc = 0;
	int bitidx = 0;
	int bit2idx = 0;
	int warnings = 0;

	/* check if we're inverting output */
	if (*Cmd == 'i')
	{
		PrintAndLog("Inverting output");
		invert = 1;
		++Cmd;
		do
			++Cmd;
		while(*Cmd == ' '); // in case a 2nd argument was given
	}

	/* Holds the decoded bitstream: each clock period contains 2 bits       */
	/* later simplified to 1 bit after manchester decoding.                 */
	/* Add 10 bits to allow for noisy / uncertain traces without aborting   */
	/* int BitStream[GraphTraceLen*2/clock+10]; */

	/* But it does not work if compiling on WIndows: therefore we just allocate a */
	/* large array */
	uint8_t BitStream[MAX_GRAPH_TRACE_LEN] = {0};

	/* Detect high and lows */
	for (i = 0; i < GraphTraceLen; i++)
	{
		if (GraphBuffer[i] > high)
			high = GraphBuffer[i];
		else if (GraphBuffer[i] < low)
			low = GraphBuffer[i];
	}

	/* Get our clock */
	clock = GetAskClock(Cmd, high, 1);

	int tolerance = clock/4;

	/* Detect first transition */
	/* Lo-Hi (arbitrary)       */
	/* skip to the first high */
	for (i= 0; i < GraphTraceLen; i++)
		if (GraphBuffer[i] == high)
			break;
	/* now look for the first low */
	for (; i < GraphTraceLen; i++)
	{
		if (GraphBuffer[i] == low)
		{
			lastval = i;
			break;
		}
	}

	/* If we're not working with 1/0s, demod based off clock */
	if (high != 1)
	{
		bit = 0; /* We assume the 1st bit is zero, it may not be
							* the case: this routine (I think) has an init problem.
							* Ed.
							*/
		for (; i < (int)(GraphTraceLen / clock); i++)
		{
			hithigh = 0;
			hitlow = 0;
			first = 1;

			/* Find out if we hit both high and low peaks */
			for (j = 0; j < clock; j++)
			{
				if (GraphBuffer[(i * clock) + j] == high)
					hithigh = 1;
				else if (GraphBuffer[(i * clock) + j] == low)
					hitlow = 1;

				/* it doesn't count if it's the first part of our read
					 because it's really just trailing from the last sequence */
				if (first && (hithigh || hitlow))
					hithigh = hitlow = 0;
				else
					first = 0;

				if (hithigh && hitlow)
					break;
			}

			/* If we didn't hit both high and low peaks, we had a bit transition */
			if (!hithigh || !hitlow)
				bit ^= 1;

			BitStream[bit2idx++] = bit ^ invert;
		}
	}

	/* standard 1/0 bitstream */
	else
	{

		/* Then detect duration between 2 successive transitions */
		for (bitidx = 1; i < GraphTraceLen; i++)
		{
			if (GraphBuffer[i-1] != GraphBuffer[i])
			{
				lc = i-lastval;
				lastval = i;

				// Error check: if bitidx becomes too large, we do not
				// have a Manchester encoded bitstream or the clock is really
				// wrong!
				if (bitidx > (GraphTraceLen*2/clock+8) ) {
					PrintAndLog("Error: the clock you gave is probably wrong, aborting.");
					return 0;
				}
				// Then switch depending on lc length:
				// Tolerance is 1/4 of clock rate (arbitrary)
				if (abs(lc-clock/2) < tolerance) {
					// Short pulse : either "1" or "0"
					BitStream[bitidx++]=GraphBuffer[i-1];
				} else if (abs(lc-clock) < tolerance) {
					// Long pulse: either "11" or "00"
					BitStream[bitidx++]=GraphBuffer[i-1];
					BitStream[bitidx++]=GraphBuffer[i-1];
				} else {
				// Error
					warnings++;
					PrintAndLog("Warning: Manchester decode error for pulse width detection.");
					PrintAndLog("(too many of those messages mean either the stream is not Manchester encoded, or clock is wrong)");

					if (warnings > 10)
					{
						PrintAndLog("Error: too many detection errors, aborting.");
						return 0;
					}
				}
			}
		}

		// At this stage, we now have a bitstream of "01" ("1") or "10" ("0"), parse it into final decoded bitstream
		// Actually, we overwrite BitStream with the new decoded bitstream, we just need to be careful
		// to stop output at the final bitidx2 value, not bitidx
		for (i = 0; i < bitidx; i += 2) {
			if ((BitStream[i] == 0) && (BitStream[i+1] == 1)) {
				BitStream[bit2idx++] = 1 ^ invert;
			} else if ((BitStream[i] == 1) && (BitStream[i+1] == 0)) {
				BitStream[bit2idx++] = 0 ^ invert;
			} else {
				// We cannot end up in this state, this means we are unsynchronized,
				// move up 1 bit:
				i++;
				warnings++;
				PrintAndLog("Unsynchronized, resync...");
				PrintAndLog("(too many of those messages mean the stream is not Manchester encoded)");

				if (warnings > 10)
				{
					PrintAndLog("Error: too many decode errors, aborting.");
					return 0;
				}
			}
		}
	}

	PrintAndLog("Manchester decoded bitstream");
	// Now output the bitstream to the scrollback by line of 16 bits
	for (i = 0; i < (bit2idx-16); i+=16) {
		PrintAndLog("%i %i %i %i %i %i %i %i %i %i %i %i %i %i %i %i",
			BitStream[i],
			BitStream[i+1],
			BitStream[i+2],
			BitStream[i+3],
			BitStream[i+4],
			BitStream[i+5],
			BitStream[i+6],
			BitStream[i+7],
			BitStream[i+8],
			BitStream[i+9],
			BitStream[i+10],
			BitStream[i+11],
			BitStream[i+12],
			BitStream[i+13],
			BitStream[i+14],
			BitStream[i+15]);
	}
	return 0;
}

/* Modulate our data into manchester */
int CmdManchesterMod(const char *Cmd)
{
	int i, j;
	int clock;
	int bit, lastbit, wave;

	/* Get our clock */
	clock = GetAskClock(Cmd, 0, 1);

	wave = 0;
	lastbit = 1;
	for (i = 0; i < (int)(GraphTraceLen / clock); i++)
	{
		bit = GraphBuffer[i * clock] ^ 1;

		for (j = 0; j < (int)(clock/2); j++)
			GraphBuffer[(i * clock) + j] = bit ^ lastbit ^ wave;
		for (j = (int)(clock/2); j < clock; j++)
			GraphBuffer[(i * clock) + j] = bit ^ lastbit ^ wave ^ 1;

		/* Keep track of how we start our wave and if we changed or not this time */
		wave ^= bit ^ lastbit;
		lastbit = bit;
	}

	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 CmdThreshold(const char *Cmd)
{
	int threshold = atoi(Cmd);

	for (int i = 0; i < GraphTraceLen; ++i) {
		if (GraphBuffer[i] >= threshold)
			GraphBuffer[i] = 1;
		else
			GraphBuffer[i] = -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"},
	{"amp",             CmdAmp,             1, "Amplify peaks"},
	//{"askdemod",      Cmdaskdemod,        1, "<0 or 1> -- Attempt to demodulate simple ASK tags"},
	{"askedgedetect",   CmdAskEdgeDetect,   1, "[threshold] Adjust Graph for manual ask demod using length of sample differences to detect the edge of a wave (default = 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>] Biphase decode bin stream in DemodBuffer (offset = 0|1 bits to shift the decode start)"},
	{"bitsamples",      CmdBitsamples,      0, "Get raw samples as bitstring"},
	//{"bitstream",     CmdBitstream,       1, "[clock rate] -- Convert waveform into a bitstream"},
	{"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)"},
	//{"fskdemod",      CmdFSKdemod,        1, "Demodulate graph window as a HID FSK"},
	{"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"},
	//{"mandemod",      CmdManchesterDemod, 1, "[i] [clock rate] -- Manchester demodulate binary stream (option 'i' to invert output)"},
	{"manrawdecode",    Cmdmandecoderaw,    1, "Manchester decode binary stream in DemodBuffer"},
	{"manmod",          CmdManchesterMod,   1, "[clock rate] -- Manchester modulate a binary stream"},
	{"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] -- 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)"},
	{"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"},
	//{"threshold",     CmdThreshold,       1, "<threshold> -- Maximize/minimize every value in the graph window depending on threshold"},
	{"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;
}