From 615f21dde29ed68c6b9dbb6c79c2a293751d777a Mon Sep 17 00:00:00 2001
From: iceman1001 <iceman@iuse.se>
Date: Wed, 3 Jun 2015 21:12:24 +0200
Subject: [PATCH] FIX: a minor bug fix from @marshmellow42 in "data raw" and
 ask/biphase. ADD: started witha  ISO11784/85 demod function.

---
 client/cmddata.c | 24 ++++++++++++++++++++++--
 client/cmddata.h |  1 +
 common/lfdemod.c | 19 +++++++++++++++++++
 common/lfdemod.h |  2 +-
 4 files changed, 43 insertions(+), 3 deletions(-)

diff --git a/client/cmddata.c b/client/cmddata.c
index 76552351..90a0921c 100644
--- a/client/cmddata.c
+++ b/client/cmddata.c
@@ -500,7 +500,7 @@ int ASKbiphaseDemod(const char *Cmd, bool verbose)
 	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 = ASKDemod(Cmd+1, FALSE, FALSE, 0);
+		ans = ASKDemod(Cmd+2, FALSE, FALSE, 0);
 	else
 		ans = ASKDemod(Cmd, FALSE, FALSE, 0);
 	if (!ans) {
@@ -512,7 +512,7 @@ int ASKbiphaseDemod(const char *Cmd, bool verbose)
 	size_t size = DemodBufferLen;
 	uint8_t BitStream[MAX_DEMOD_BUF_LEN];
 	memcpy(BitStream, DemodBuffer, DemodBufferLen); 
-	int errCnt = BiphaseRawDecode(BitStream, &size, offset, 0);
+	int errCnt = BiphaseRawDecode(BitStream, &size, offset, invert);
 	if (errCnt < 0){
 		if (g_debugMode || verbose) PrintAndLog("Error BiphaseRawDecode: %d", errCnt);
 		return 0;
@@ -1457,6 +1457,25 @@ int CmdFSKdemodPyramid(const char *Cmd)
 	return 1;
 }
 
+int CmdIso11784demodBI(const char *Cmd){
+	//ASK/Biphase demod,
+	uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
+	size_t size = getFromGraphBuf(BitStream);
+	if (size==0) return 0;
+
+	//get binary from Biphase wave
+	int idx = ISO11784demodBI(BitStream, &size);
+	setDemodBuf(BitStream,128,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;
+	// }
+	return 1;
+}
+
+
 //by marshmellow
 //attempt to psk1 demod graph buffer
 int PSKDemod(const char *Cmd, bool verbose)
@@ -2212,6 +2231,7 @@ static command_t CommandTable[] =
 	{"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"},
+	{"iso11784demod",   CmdIso11784demodBI, 1, "Demodulate a ISO11784/85 Biphase tag from GraphBuffer"},
 	{"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"},
diff --git a/client/cmddata.h b/client/cmddata.h
index c6230736..4ad5fbd0 100644
--- a/client/cmddata.h
+++ b/client/cmddata.h
@@ -33,6 +33,7 @@ int CmdFSKdemodIO(const char *Cmd);
 int CmdFSKdemodParadox(const char *Cmd);
 int CmdFSKdemodPyramid(const char *Cmd);
 int CmdFSKrawdemod(const char *Cmd);
+int CmdIso11784demodBI(const char *Cmd);
 int CmdPSK1rawDemod(const char *Cmd);
 int CmdPSK2rawDemod(const char *Cmd);
 int CmdPSKNexWatch(const char *Cmd);
diff --git a/common/lfdemod.c b/common/lfdemod.c
index 7d40d22e..2c650144 100644
--- a/common/lfdemod.c
+++ b/common/lfdemod.c
@@ -589,6 +589,25 @@ size_t removeParity(uint8_t *BitStream, size_t startIdx, uint8_t pLen, uint8_t p
 	//return ID start index and size
 	return bitCnt;
 }
+// Ask/Biphase Demod then try to locate an ISO 11784/85 ID
+int ISO11784demodBI(uint8_t *dest, size_t *size)
+{
+	//make sure buffer has enough data
+	if (*size < 128*50) return -1;
+
+	if (justNoise(dest, *size)) return -2;
+
+	// FSK demodulator
+	*size = fskdemod(dest, *size, 50, 1, 10, 8);  // fsk2a RF/50 
+	if (*size < 96) return -3;  //did we get a good demod?
+
+	uint8_t preamble[] = {0,0,0,0,0,0,0,0,0,0,1};
+	size_t startIdx = 0;
+	uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx);
+	if (errChk == 0) return -4; //preamble not found
+	if (*size != 128) return -5;
+	return (int)startIdx;
+}
 
 // by marshmellow
 // FSK Demod then try to locate an AWID ID
diff --git a/common/lfdemod.h b/common/lfdemod.h
index ab81c34c..f2cee27f 100644
--- a/common/lfdemod.h
+++ b/common/lfdemod.h
@@ -47,5 +47,5 @@ int IOdemodFSK(uint8_t *dest, size_t size);
 int indala26decode(uint8_t *bitStream, size_t *size, uint8_t *invert);
 int PyramiddemodFSK(uint8_t *dest, size_t *size);
 int ParadoxdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, uint32_t *lo);
-
+int ISO11784demodBI(uint8_t *dest, size_t *size);
 #endif
-- 
2.39.2