git.zerfleddert.de Git - proxmark3-svn/blob - armsrc/BigBuf.c

   1 //-----------------------------------------------------------------------------
   2 // Jonathan Westhues, Aug 2005
   3 // Gerhard de Koning Gans, April 2008, May 2011
   4 //
   5 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   6 // at your option, any later version. See the LICENSE.txt file for the text of
   7 // the license.
   8 //-----------------------------------------------------------------------------
   9 // BigBuf and functions to allocate/free parts of it.
  10 //-----------------------------------------------------------------------------
  11
  12 #include <stdint.h>
  13 #include "proxmark3.h"
  14 #include "apps.h"
  15 #include "string.h"
  16
  17 // The large multi-purpose buffer, typically used to hold A/D samples or traces,
  18 // may be processed in some way. Also used to hold various smaller buffers.
  19 static uint8_t BigBuf[BIGBUF_SIZE];
  20
  21 // High memory mark
  22 static uint16_t BigBuf_hi = BIGBUF_SIZE;
  23
  24 // trace related global variables. Change to function calls?
  25 //uint8_t *trace = BigBuf;
  26 uint16_t traceLen;
  27
  28
  29 // get the address of BigBuf
  30 uint8_t *BigBuf_get_addr(void)
  31 {
  32         return BigBuf;
  33 }
  34
  35
  36 // clear ALL of BigBuf
  37 void BigBuf_Clear(void)
  38 {
  39         memset(BigBuf,0,BIGBUF_SIZE);
  40         Dbprintf("Buffer cleared (%i bytes)",BIGBUF_SIZE);
  41 }
  42
  43
  44 // allocate a chunk of memory from BigBuf. We allocate high memory first. Low memory
  45 // is always for traces/samples
  46 uint8_t *BigBuf_malloc(uint16_t chunksize)
  47 {
  48         if (BigBuf_hi - chunksize < 0) {
  49                 return NULL;                                            // no memory left
  50         } else {
  51                 BigBuf_hi -= chunksize;                         // aligned to 4 Byte boundary
  52                 return BigBuf + BigBuf_hi;
  53         }
  54 }
  55
  56
  57 // free ALL allocated chunks. The whole BigBuf is available for traces again.
  58 void BigBuf_free(void)
  59 {
  60         BigBuf_hi = BIGBUF_SIZE;
  61 }
  62
  63
  64 // return the maximum trace length (i.e. the unallocated size of BigBuf)
  65 uint16_t BigBuf_max_trace_len(void)
  66 {
  67         return BigBuf_hi;
  68 }