CHG: Cleaning up

[proxmark3-svn] / armsrc / BigBuf.c

diff --git a/armsrc/BigBuf.c b/armsrc/BigBuf.c
index 987fee7d520b581a7909644fd62d37ee4c49d161..cf0c26b2b176c1dc8da7be8eab8fa19ab70520ed 100644 (file)
--- a/armsrc/BigBuf.c
+++ b/armsrc/BigBuf.c
@@ -8,61 +8,249 @@
 //-----------------------------------------------------------------------------
 // BigBuf and functions to allocate/free parts of it.
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 // 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;
 
 
 // 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)
 {
 
 // 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)
 {
 
 // 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) { 
 uint8_t *BigBuf_malloc(uint16_t chunksize)
 {
        if (BigBuf_hi - chunksize < 0) { 

-               return NULL;                                            // no memory left
+               return NULL;                                                    // no memory left

        } else {
        } 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;
 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)
 
 // 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;
 {
        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;
+       }
+}