Merged with master

[proxmark3-svn] / armsrc / BigBuf.c

diff --git a/armsrc/BigBuf.c b/armsrc/BigBuf.c
new file mode 100644 (file)
index 0000000..7f56e9a
--- /dev/null
+++ b/armsrc/BigBuf.c
@@ -0,0 +1,97 @@
+//-----------------------------------------------------------------------------
+// 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"
+
+// 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)];
+
+// High memory mark
+static uint16_t BigBuf_hi = BIGBUF_SIZE;
+
+// pointer to the emulator memory.
+static uint8_t *emulator_memory = NULL;
+
+// trace related global variables
+// (only one left). ToDo: make this static as well?
+uint16_t traceLen = 0;
+
+
+// get the address of BigBuf
+uint8_t *BigBuf_get_addr(void)
+{
+       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)
+{
+       if (emulator_memory == NULL) {          // not yet allocated
+               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);
+}
+
+
+// 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
+       } else {
+               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 or samples again.
+void BigBuf_free(void)
+{
+       BigBuf_hi = BIGBUF_SIZE;
+       emulator_memory = NULL;
+}
+
+
+// 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;
+       }
+}
+
+
+// return the maximum trace length (i.e. the unallocated size of BigBuf)
+uint16_t BigBuf_max_traceLen(void)
+{
+       return BigBuf_hi;
+}