X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/117d9ec25c7cbc88555a6a990293ca95a544b915..87c10b2a0f49b1542258b5a4ed6f83a125c5da8f:/armsrc/BigBuf.c?ds=inline

diff --git a/armsrc/BigBuf.c b/armsrc/BigBuf.c
index 987fee7d..cf0c26b2 100644
--- a/armsrc/BigBuf.c
+++ b/armsrc/BigBuf.c
@@ -8,61 +8,249 @@
 //-----------------------------------------------------------------------------
 // BigBuf and functions to allocate/free parts of it.
 //-----------------------------------------------------------------------------
+#include "BigBuf.h"
 
-#include <stdint.h>
-#include "proxmark3.h"
-#include "apps.h"
-#include "string.h"
+// BigBuf is the large multi-purpose buffer, typically used to hold A/D samples or traces.
+// Also used to hold various smaller buffers and the Mifare Emulator Memory.
+// declare it as uint32_t to achieve alignment to 4 Byte boundary
+static uint32_t BigBuf[BIGBUF_SIZE/sizeof(uint32_t)];
 
-// The large multi-purpose buffer, typically used to hold A/D samples or traces,
-// may be processed in some way. Also used to hold various smaller buffers.
-static uint8_t BigBuf[BIGBUF_SIZE];
+/* BigBuf memory layout:
+Pointer to highest available memory: BigBuf_hi
+
+    high BIGBUF_SIZE
+    reserved = BigBuf_malloc()  subtracts amount from BigBuf_hi,   
+	low  0x00
+*/
 
 // High memory mark
 static uint16_t BigBuf_hi = BIGBUF_SIZE;
 
-// trace related global variables. Change to function calls?
-//uint8_t *trace = BigBuf;
-uint16_t traceLen;
+// pointer to the emulator memory.
+static uint8_t *emulator_memory = NULL;
 
+// trace related variables
+static uint16_t traceLen = 0;
+int tracing = 1; //Last global one.. todo static?
 
 // get the address of BigBuf
 uint8_t *BigBuf_get_addr(void)
 {
-	return BigBuf;
+	return (uint8_t *)BigBuf;
 }
 
+// get the address of the emulator memory. Allocate part of Bigbuf for it, if not yet done
+uint8_t *BigBuf_get_EM_addr(void)
+{
+	// not yet allocated
+	if (emulator_memory == NULL)
+		emulator_memory = BigBuf_malloc(CARD_MEMORY_SIZE);
+	
+	return emulator_memory;
+}
 
 // clear ALL of BigBuf
 void BigBuf_Clear(void)
 {
-	memset(BigBuf,0,BIGBUF_SIZE);
-	Dbprintf("Buffer cleared (%i bytes)",BIGBUF_SIZE);
+	BigBuf_Clear_ext(true);
 }
 
+// clear ALL of BigBuf
+void BigBuf_Clear_ext(bool verbose)
+{
+	memset(BigBuf, 0, BIGBUF_SIZE);
+	if (verbose) 
+		Dbprintf("Buffer cleared (%i bytes)", BIGBUF_SIZE);
+}
 
-// allocate a chunk of memory from BigBuf. We allocate high memory first. Low memory
-// is always for traces/samples
+void BigBuf_Clear_keep_EM(void)
+{
+	memset(BigBuf, 0, BigBuf_hi);
+}
+
+// allocate a chunk of memory from BigBuf. We allocate high memory first. The unallocated memory
+// at the beginning of BigBuf is always for traces/samples
 uint8_t *BigBuf_malloc(uint16_t chunksize)
 {
 	if (BigBuf_hi - chunksize < 0) { 
-		return NULL;						// no memory left
+		return NULL;							// no memory left
 	} else {
-		BigBuf_hi -= chunksize; 		  	// aligned to 4 Byte boundary 
-		return BigBuf + BigBuf_hi;
+		chunksize = (chunksize + 3) & 0xfffc;	// round to next multiple of 4
+		BigBuf_hi -= chunksize; 		  		// aligned to 4 Byte boundary 
+		return (uint8_t *)BigBuf + BigBuf_hi;
 	}
 }
 
-
-// free ALL allocated chunks. The whole BigBuf is available for traces again.
+// free ALL allocated chunks. The whole BigBuf is available for traces or samples again.
 void BigBuf_free(void)
 {
 	BigBuf_hi = BIGBUF_SIZE;
+	emulator_memory = NULL;
+	
+	// shouldn't this empty BigBuf also?
 }
 
+// free allocated chunks EXCEPT the emulator memory
+void BigBuf_free_keep_EM(void)
+{
+	if (emulator_memory != NULL)
+		BigBuf_hi = emulator_memory - (uint8_t *)BigBuf;
+	else
+		BigBuf_hi = BIGBUF_SIZE;
+	
+	// shouldn't this empty BigBuf also?
+}
+
+void BigBuf_print_status(void)
+{
+	Dbprintf("Memory");
+	Dbprintf("  BIGBUF_SIZE.............%d", BIGBUF_SIZE);
+	Dbprintf("  Available memory........%d", BigBuf_hi);
+	Dbprintf("Tracing");
+	Dbprintf("  tracing ................%d", tracing);
+	Dbprintf("  traceLen ...............%d", traceLen);
+}
 
 // return the maximum trace length (i.e. the unallocated size of BigBuf)
-uint16_t BigBuf_max_trace_len(void)
+uint16_t BigBuf_max_traceLen(void)
 {
 	return BigBuf_hi;
-}
\ No newline at end of file
+}
+
+void clear_trace() {
+	traceLen = 0;
+}
+
+void set_tracing(bool enable) {
+	tracing = enable;
+}
+
+/**
+ * Get the number of bytes traced
+ * @return
+ */
+uint16_t BigBuf_get_traceLen(void)
+{
+	return traceLen;
+}
+
+/**
+  This is a function to store traces. All protocols can use this generic tracer-function.
+  The traces produced by calling this function can be fetched on the client-side
+  by 'hf list raw', alternatively 'hf list <proto>' for protocol-specific
+  annotation of commands/responses.
+**/
+bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_start, uint32_t timestamp_end, uint8_t *parity, bool readerToTag)
+{
+	if (!tracing) return FALSE;
+
+	uint8_t *trace = BigBuf_get_addr();
+
+	uint16_t num_paritybytes = (iLen-1)/8 + 1;	// number of valid paritybytes in *parity
+	uint16_t duration = timestamp_end - timestamp_start;
+
+	// Return when trace is full
+	if (traceLen + sizeof(iLen) + sizeof(timestamp_start) + sizeof(duration) + num_paritybytes + iLen >= BigBuf_max_traceLen()) {
+		tracing = FALSE;	// don't trace any more
+		return FALSE;
+	}
+	// Traceformat:
+	// 32 bits timestamp (little endian)
+	// 16 bits duration (little endian)
+	// 16 bits data length (little endian, Highest Bit used as readerToTag flag)
+	// y Bytes data
+	// x Bytes parity (one byte per 8 bytes data)
+
+	// timestamp (start)
+	trace[traceLen++] = ((timestamp_start >> 0) & 0xff);
+	trace[traceLen++] = ((timestamp_start >> 8) & 0xff);
+	trace[traceLen++] = ((timestamp_start >> 16) & 0xff);
+	trace[traceLen++] = ((timestamp_start >> 24) & 0xff);
+
+	// duration
+	trace[traceLen++] = ((duration >> 0) & 0xff);
+	trace[traceLen++] = ((duration >> 8) & 0xff);
+
+	// data length
+	trace[traceLen++] = ((iLen >> 0) & 0xff);
+	trace[traceLen++] = ((iLen >> 8) & 0xff);
+
+	// readerToTag flag
+	if (!readerToTag) {
+		trace[traceLen - 1] |= 0x80;
+	}
+
+	// data bytes
+	if (btBytes != NULL && iLen != 0) {
+		memcpy(trace + traceLen, btBytes, iLen);
+	}
+	traceLen += iLen;
+
+	// parity bytes
+	if (num_paritybytes != 0) {
+		if (parity != NULL) {
+			memcpy(trace + traceLen, parity, num_paritybytes);
+		} else {
+			memset(trace + traceLen, 0x00, num_paritybytes);
+		}
+	}
+	traceLen += num_paritybytes;
+
+	return TRUE;
+}
+
+
+int LogTraceHitag(const uint8_t * btBytes, int iBits, int iSamples, uint32_t dwParity, int readerToTag)
+{
+	/**
+	  Todo, rewrite the logger to use the generic functionality instead. It should be noted, however,
+	  that this logger takes number of bits as argument, not number of bytes.
+	  **/
+
+	if (!tracing) return FALSE;
+
+	uint8_t *trace = BigBuf_get_addr();
+	uint16_t iLen = nbytes(iBits);
+	// Return when trace is full
+	if (traceLen + sizeof(rsamples) + sizeof(dwParity) + sizeof(iBits) + iLen > BigBuf_max_traceLen()) return FALSE;
+
+	//Hitag traces appear to use this traceformat:
+	// 32 bits timestamp (little endian,Highest Bit used as readerToTag flag)
+	// 32 bits parity
+	// 8 bits size (number of bits in the trace entry, not number of bytes)
+	// y Bytes data
+
+	rsamples += iSamples;
+	trace[traceLen++] = ((rsamples >> 0) & 0xff);
+	trace[traceLen++] = ((rsamples >> 8) & 0xff);
+	trace[traceLen++] = ((rsamples >> 16) & 0xff);
+	trace[traceLen++] = ((rsamples >> 24) & 0xff);
+
+	if (!readerToTag) {
+		trace[traceLen - 1] |= 0x80;
+	}
+
+	trace[traceLen++] = ((dwParity >> 0) & 0xff);
+	trace[traceLen++] = ((dwParity >> 8) & 0xff);
+	trace[traceLen++] = ((dwParity >> 16) & 0xff);
+	trace[traceLen++] = ((dwParity >> 24) & 0xff);
+	trace[traceLen++] = iBits;
+
+	memcpy(trace + traceLen, btBytes, iLen);
+	traceLen += iLen;
+
+	return TRUE;
+}
+
+
+// Emulator memory
+uint8_t emlSet(uint8_t *data, uint32_t offset, uint32_t length){
+	uint8_t* mem = BigBuf_get_EM_addr();
+	if(offset+length < CARD_MEMORY_SIZE) {
+		memcpy(mem+offset, data, length);
+		return 0;
+	} else {
+		Dbprintf("Error, trying to set memory outside of bounds! %d  > %d", (offset+length), CARD_MEMORY_SIZE);
+		return 1;
+	}
+}