cleanup

examples/knx-linux/CMakeLists.txt

@@ -112,6 +112,8 @@ add_executable(knx-linux
 	../../src/knx_facade.h
 	../../src/linux_platform.cpp 
 	../../src/linux_platform.h
+        fdsk.cpp
+        fdsk.h
 	main.cpp)
 target_link_libraries(knx-linux  "${LIBRARIES_FROM_REFERENCES}")
 include_directories(../../src)

examples/knx-linux/fdsk.cpp

@@ -0,0 +1,189 @@
+#include "fdsk.h"
+
+#include <string.h>
+#include <stdio.h>
+
+// CRC-4 generator polynom: 10011 (x^4+x+1)
+const uint8_t FdskCalculator::crc4_tab[16] =
+{
+    0x0, 0x3, 0x6, 0x5, 0xc, 0xf, 0xa, 0x9,
+    0xb, 0x8, 0xd, 0xe, 0x7, 0x4, 0x1, 0x2
+};
+
+void FdskCalculator::printFdsk(uint8_t* serialNumber, uint8_t* key)
+{
+    char* str = generateFdskString(serialNumber, key);
+
+    uint8_t len = strlen(str);
+    printf("FDSK(len: %d): ", len);
+    for (int i = 0; i < 36; i++)
+    {
+        if (((i % 6) == 0) && (i!=0))
+            printf("-");
+        printf("%c", str[i]);
+    }
+    printf("\n");
+
+    delete[] str;
+}
+
+char* FdskCalculator::generateFdskString(uint8_t* serialNumber, uint8_t* key)
+{
+    uint8_t buffer[6 + 16 + 1]; // 6 bytes serialnumber + 16 bytes key + 1 byte placeholder for crc-4
+    memcpy(&buffer[0], serialNumber, 6);
+    memcpy(&buffer[6], key, 16);
+    buffer[22] = (crc4Array(buffer, sizeof(buffer)-1)<<4) &0xFF;
+
+    uint8_t* outEncoded = nullptr;
+    toBase32(buffer, sizeof(buffer), outEncoded, false);
+
+    return (char*)outEncoded;
+}
+
+int FdskCalculator::ceil(float num)
+{
+    int inum = (int)num;
+    if (num == (float)inum) {
+        return inum;
+    }
+    return inum + 1;
+}
+
+int FdskCalculator::toBase32(uint8_t* in, long length, uint8_t*& out, bool usePadding)
+{
+  char base32StandardAlphabet[] = {"ABCDEFGHIJKLMNOPQRSTUVWXYZ234567"};
+  char standardPaddingChar = '=';
+
+  int result = 0;
+  int count = 0;
+  int bufSize = 8;
+  int index = 0;
+  int size = 0; // size of temporary array
+  uint8_t* temp = nullptr;
+
+  if (length < 0 || length > 268435456LL)
+  {
+    return 0;
+  }
+
+  size = 8 * ceil(length / 4.0); // Calculating size of temporary array. Not very precise.
+  temp = new uint8_t[size];
+
+  if (length > 0)
+  {
+    int buffer = in[0];
+    int next = 1;
+    int bitsLeft = 8;
+
+    while (count < bufSize && (bitsLeft > 0 || next < length))
+    {
+      if (bitsLeft < 5)
+      {
+        if (next < length)
+        {
+          buffer <<= 8;
+          buffer |= in[next] & 0xFF;
+          next++;
+          bitsLeft += 8;
+        }
+        else
+        {
+          int pad = 5 - bitsLeft;
+          buffer <<= pad;
+          bitsLeft += pad;
+        }
+      }
+      index = 0x1F & (buffer >> (bitsLeft -5));
+
+      bitsLeft -= 5;
+      temp[result] = (uint8_t)base32StandardAlphabet[index];
+      result++;
+    }
+  }
+
+  if (usePadding)
+  {
+    int pads = (result % 8);
+    if (pads > 0)
+    {
+      pads = (8 - pads);
+      for (int i = 0; i < pads; i++)
+      {
+        temp[result] = standardPaddingChar;
+        result++;
+      }
+    }
+  }
+
+  out = new uint8_t[result];
+
+  memcpy(out, temp, result);
+  delete [] temp;
+
+  return result;
+}
+
+int FdskCalculator::fromBase32(uint8_t* in, long length, uint8_t*& out)
+{
+  int result = 0; // Length of the array of decoded values.
+  int buffer = 0;
+  int bitsLeft = 0;
+  uint8_t* temp = NULL;
+
+  temp = new uint8_t[length]; // Allocating temporary array.
+
+  for (int i = 0; i < length; i++)
+  {
+    uint8_t ch = in[i];
+
+    // ignoring some characters: ' ', '\t', '\r', '\n', '='
+    if (ch == 0xA0 || ch == 0x09 || ch == 0x0A || ch == 0x0D || ch == 0x3D)
+        continue;
+
+    // recovering mistyped: '0' -> 'O', '1' -> 'L', '8' -> 'B'
+    if (ch == 0x30)
+    {
+        ch = 0x4F;
+    }
+    else if (ch == 0x31)
+    {
+        ch = 0x4C;
+    }
+    else if (ch == 0x38)
+    {
+        ch = 0x42;
+    }
+
+
+    // look up one base32 symbols: from 'A' to 'Z' or from 'a' to 'z' or from '2' to '7'
+    if ((ch >= 0x41 && ch <= 0x5A) || (ch >= 0x61 && ch <= 0x7A))
+    {
+        ch = ((ch & 0x1F) - 1);
+    }
+    else if (ch >= 0x32 && ch <= 0x37)
+    {
+        ch -= (0x32 - 26);
+    }
+    else {
+        delete [] temp;
+        return 0;
+    }
+
+    buffer <<= 5;
+    buffer |= ch;
+    bitsLeft += 5;
+    if (bitsLeft >= 8)
+    {
+      temp[result] = (unsigned char)((unsigned int)(buffer >> (bitsLeft - 8)) & 0xFF);
+      result++;
+      bitsLeft -= 8;
+    }
+  }
+
+  out = new uint8_t[result];
+  memcpy(out, temp, result);
+  delete [] temp;
+
+  return result;
+}
+

examples/knx-linux/fdsk.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <stdint.h>
+
+class FdskCalculator
+{
+  public:
+    void printFdsk(uint8_t* serialNumber, uint8_t* key);
+
+  private:
+    char* generateFdskString(uint8_t* serialNumber, uint8_t* key);
+
+    int toBase32(uint8_t* in, long length, uint8_t*& out, bool usePadding);
+    int fromBase32(uint8_t* in, long length, uint8_t*& out);
+
+    uint8_t crc4Array(uint8_t* data, uint8_t len) {
+        uint8_t start = 0;
+        for (uint8_t i = 0; i <len; i++)
+        {
+            start = crc4(start, data[i]);
+        }
+        return start;
+    }
+
+    uint8_t crc4(uint8_t c, uint8_t x) {
+        uint8_t low4Bits = x & 0x0F;
+        uint8_t high4Bits = x >> 4;
+        c = crc4_tab[c ^ high4Bits];
+        c = crc4_tab[c ^ low4Bits];
+
+        return c;
+    }
+
+    int ceil(float num);
+
+    static const uint8_t crc4_tab[16];
+};

examples/knx-linux/main.cpp

@@ -14,6 +14,8 @@
 #include <sched.h>
 #include <sys/mman.h>
 
+#include "fdsk.h"
+
 volatile sig_atomic_t loopActive = 1;
 void signalHandler(int sig)
 {
@@ -46,130 +48,6 @@ long lastsend = 0;
 #define MIN knx.getGroupObject(3)
 #define RESET knx.getGroupObject(4)
 
-int ceil(float num) {
-    int inum = (int)num;
-    if (num == (float)inum) {
-        return inum;
-    }
-    return inum + 1;
-}
-
-int toBase32(uint8_t* in, long length, uint8_t*& out, bool usePadding)
-{
-  char base32StandardAlphabet[] = {"ABCDEFGHIJKLMNOPQRSTUVWXYZ234567"};
-  char standardPaddingChar = '=';
-
-  int result = 0;
-  int count = 0;
-  int bufSize = 8;
-  int index = 0;
-  int size = 0; // size of temporary array
-  uint8_t* temp = NULL;
-
-  if (length < 0 || length > 268435456LL)
-  {
-    return 0;
-  }
-
-  size = 8 * ceil(length / 4.0); // Calculating size of temporary array. Not very precise.
-  temp = (uint8_t*)malloc(size); // Allocating temporary array.
-
-  if (length > 0)
-  {
-    int buffer = in[0];
-    int next = 1;
-    int bitsLeft = 8;
-
-    while (count < bufSize && (bitsLeft > 0 || next < length))
-    {
-      if (bitsLeft < 5)
-      {
-        if (next < length)
-        {
-          buffer <<= 8;
-          buffer |= in[next] & 0xFF;
-          next++;
-          bitsLeft += 8;
-        }
-        else
-        {
-          int pad = 5 - bitsLeft;
-          buffer <<= pad;
-          bitsLeft += pad;
-        }
-      }
-      index = 0x1F & (buffer >> (bitsLeft -5));
-
-      bitsLeft -= 5;
-      temp[result] = (uint8_t)base32StandardAlphabet[index];
-      result++;
-    }
-  }
-
-  if (usePadding)
-  {
-    int pads = (result % 8);
-    if (pads > 0)
-    {
-      pads = (8 - pads);
-      for (int i = 0; i < pads; i++)
-      {
-        temp[result] = standardPaddingChar;
-        result++;
-      }
-    }
-  }
-
-  out = (uint8_t*)malloc(result);
-  memcpy(out, temp, result);
-  free(temp);
-
-  return result;
-}
-
-int fromBase32(uint8_t* in, long length, uint8_t*& out)
-{
-  int result = 0; // Length of the array of decoded values.
-  int buffer = 0;
-  int bitsLeft = 0;
-  uint8_t* temp = NULL;
-
-  temp = (uint8_t*)malloc(length); // Allocating temporary array.
-
-  for (int i = 0; i < length; i++)
-  {
-    uint8_t ch = in[i];
-
-    // ignoring some characters: ' ', '\t', '\r', '\n', '='
-    if (ch == 0xA0 || ch == 0x09 || ch == 0x0A || ch == 0x0D || ch == 0x3D) continue;
-
-    // recovering mistyped: '0' -> 'O', '1' -> 'L', '8' -> 'B'
-    if (ch == 0x30) { ch = 0x4F; } else if (ch == 0x31) { ch = 0x4C; } else if (ch == 0x38) { ch = 0x42; }
-
-
-    // look up one base32 symbols: from 'A' to 'Z' or from 'a' to 'z' or from '2' to '7'
-    if ((ch >= 0x41 && ch <= 0x5A) || (ch >= 0x61 && ch <= 0x7A)) { ch = ((ch & 0x1F) - 1); }
-    else if (ch >= 0x32 && ch <= 0x37) { ch -= (0x32 - 26); }
-    else { free(temp); return 0; }
-
-    buffer <<= 5;
-    buffer |= ch;
-    bitsLeft += 5;
-    if (bitsLeft >= 8)
-    {
-      temp[result] = (unsigned char)((unsigned int)(buffer >> (bitsLeft - 8)) & 0xFF);
-      result++;
-      bitsLeft -= 8;
-    }
-  }
-
-  out = (uint8_t*)malloc(result);
-  memcpy(out, temp, result);
-  free(temp);
-
-  return result;
-}
-
 void measureTemp()
 {
     long now = millis();
@@ -252,13 +130,11 @@ int main(int argc, char **argv)
         knx.masterReset(eraseCode, 0);
     }
 
-    uint8_t inPlain[] { 0x00, 0xFA, 0x01, 0x02, 0x03, 0x04, // KNX Serial
+    uint8_t serialNumber[] = { 0x00, 0xFA, 0x01, 0x02, 0x03, 0x04};
-                        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F}; // Key
+    uint8_t key[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F};
-    uint8_t* outEncoded = NULL;
 
-    uint8_t len = toBase32(inPlain, sizeof(inPlain), outEncoded, false);
+    FdskCalculator calc;
-
+    calc.printFdsk(serialNumber, key);
-    printf("FDSK(len: %d): %s\n", len, outEncoded);
 
     // Prevent swapping of this process
     struct sched_param sp;