X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/b69adb794594cc7ea43d3aa70aab091265195abf..aaa1a9a2dcb8b9f2b6acd937f84464daa50ecad6:/armsrc/BigBuf.c

diff --git a/armsrc/BigBuf.c b/armsrc/BigBuf.c
index 51fafdeb..407133fd 100644
--- a/armsrc/BigBuf.c
+++ b/armsrc/BigBuf.c
@@ -16,10 +16,17 @@
 
 // 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)];
 
+/* 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;
 
@@ -40,9 +47,9 @@ uint8_t *BigBuf_get_addr(void)
 // get the address of the emulator memory. Allocate part of Bigbuf for it, if not yet done
 uint8_t *BigBuf_get_EM_addr(void)
 {
-	if (emulator_memory == NULL) {		// not yet allocated
+	// not yet allocated
+	if (emulator_memory == NULL)
 		emulator_memory = BigBuf_malloc(CARD_MEMORY_SIZE);
-	}
 	
 	return emulator_memory;
 }
@@ -51,10 +58,20 @@ uint8_t *BigBuf_get_EM_addr(void)
 // 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);
 }
 
+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
@@ -75,19 +92,31 @@ 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) {
+	if (emulator_memory != NULL)
 		BigBuf_hi = emulator_memory - (uint8_t *)BigBuf;
-	} else {
+	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_traceLen(void)
@@ -96,9 +125,6 @@ uint16_t BigBuf_max_traceLen(void)
 }
 
 void clear_trace() {
-	uint8_t *trace = BigBuf_get_addr();
-	uint16_t max_traceLen = BigBuf_max_traceLen();
-	memset(trace, 0x44, max_traceLen);
 	traceLen = 0;
 }
 
@@ -132,9 +158,7 @@ bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_
 	uint16_t duration = timestamp_end - timestamp_start;
 
 	// Return when trace is full
-	uint16_t max_traceLen = BigBuf_max_traceLen();
-
-	if (traceLen + sizeof(iLen) + sizeof(timestamp_start) + sizeof(duration) + num_paritybytes + iLen >= max_traceLen) {
+	if (traceLen + sizeof(iLen) + sizeof(timestamp_start) + sizeof(duration) + num_paritybytes + iLen >= BigBuf_max_traceLen()) {
 		tracing = FALSE;	// don't trace any more
 		return FALSE;
 	}
@@ -171,7 +195,7 @@ bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_
 	traceLen += iLen;
 
 	// parity bytes
-	if (iLen != 0) {
+	if (num_paritybytes != 0) {
 		if (parity != NULL) {
 			memcpy(trace + traceLen, parity, num_paritybytes);
 		} else {