Refactoring of BigBuf handling in order to prepare for more efficient memory allocation and longer traces.

armsrc/BigBuf.c

@@ -0,0 +1,68 @@
+//-----------------------------------------------------------------------------
+// Jonathan Westhues, Aug 2005
+// Gerhard de Koning Gans, April 2008, May 2011
+//
+// 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.
+//-----------------------------------------------------------------------------
+// BigBuf and functions to allocate/free parts of it.
+//-----------------------------------------------------------------------------
+
+#include <stdint.h>
+#include "proxmark3.h"
+#include "apps.h"
+#include "string.h"
+
+// 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];
+
+// 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;
+
+
+// get the address of BigBuf
+uint8_t *BigBuf_get_addr(void)
+{
+	return BigBuf;
+}
+
+
+// clear ALL of BigBuf
+void BigBuf_Clear(void)
+{
+	memset(BigBuf,0,BIGBUF_SIZE);
+	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
+uint8_t *BigBuf_malloc(uint16_t chunksize)
+{
+	if (BigBuf_hi - chunksize < 0) { 
+		return NULL;						// no memory left
+	} else {
+		BigBuf_hi -= chunksize; 		  	// aligned to 4 Byte boundary 
+		return BigBuf + BigBuf_hi;
+	}
+}
+
+
+// free ALL allocated chunks. The whole BigBuf is available for traces again.
+void BigBuf_free(void)
+{
+	BigBuf_hi = BIGBUF_SIZE;
+}
+
+
+// return the maximum trace length (i.e. the unallocated size of BigBuf)
+uint16_t BigBuf_max_trace_len(void)
+{
+	return BigBuf_hi;
+}