FIX: the lua script hf_reader.lua now works with 14B tags.

[proxmark3-svn] / client / util.c

diff --git a/client/util.c b/client/util.c
index 9d4c83ee2b975e997a6db42e1b3eb8c9e9061b48..9768dbeb088bb538a1c3d21408d61f4a823732c7 100644 (file)
--- a/client/util.c
+++ b/client/util.c
@@ -97,14 +97,27 @@ void FillFileNameByUID(char *fileName, uint8_t * uid, char *ext, int byteCount)
 }
 
 // printing and converting functions
-
-void print_hex(const uint8_t * data, const size_t len)
-{
+void print_hex(const uint8_t * data, const size_t len) {
        size_t i;
-
-       for (i=0; i < len; i++)
+       for (i=0; i < len; ++i)
                printf("%02x ", data[i]);
+       printf("\n");
+}
+
+void print_hex_break(const uint8_t *data, const size_t len, uint8_t breaks) {
+
+       int rownum = 0;
+       printf("[%02d] | ", rownum);
+       for (int i = 0; i < len; ++i) {
 
+               printf("%02X ", data[i]);
+               
+               // check if a line break is needed
+               if ( breaks > 0 && !((i+1) % breaks) && (i+1 < len) ) {
+                       ++rownum;
+                       printf("\n[%02d] | ", rownum);
+               }
+       }
        printf("\n");
 }
 
@@ -123,8 +136,10 @@ char *sprint_hex(const uint8_t *data, const size_t len) {
 }
 
 char *sprint_bin_break(const uint8_t *data, const size_t len, const uint8_t breaks) {
+       
        // make sure we don't go beyond our char array memory
-       int max_len;
+       size_t in_index = 0, out_index = 0;
+       int max_len;    
        if (breaks==0)
                max_len = ( len > MAX_BIN_BREAK_LENGTH ) ? MAX_BIN_BREAK_LENGTH : len;
        else
@@ -135,20 +150,20 @@ char *sprint_bin_break(const uint8_t *data, const size_t len, const uint8_t brea
        memset(buf, 0x00, sizeof(buf));
        char *tmp = buf;
 
-       size_t in_index = 0;
        // loop through the out_index to make sure we don't go too far
-       for (size_t out_index=0; out_index < max_len-2; out_index++) {
+       for (out_index=0; out_index < max_len-2; out_index++) {
                // set character
-               sprintf(tmp++, "%u", data[in_index]);
+               sprintf(tmp++, "%u", (unsigned int) data[in_index]);
                // check if a line break is needed and we have room to print it in our array
                if ( (breaks > 0) && !((in_index+1) % breaks) && (out_index+1 != max_len) ) {
                        // increment and print line break
                        out_index++;
                        sprintf(tmp++, "%s","\n");
-       }
+               }
                in_index++;
        }
-
+       // last char.
+       sprintf(tmp++, "%u", (unsigned int) data[in_index]);
        return buf;
 }
 
@@ -158,11 +173,13 @@ char *sprint_bin(const uint8_t *data, const size_t len) {
 
 char *sprint_hex_ascii(const uint8_t *data, const size_t len) {
        static char buf[1024];
-       memset(buf, 0x00, 1024);
        char *tmp = buf;
-       sprintf(tmp, "%s| %s", sprint_hex(data, len) , data);   
+       memset(buf, 0x00, 1024);
+       size_t max_len = (len > 1010) ? 1010 : len;
+       sprintf(tmp, "%s| %s", sprint_hex(data, max_len) , data);       
        return buf;
 }
+
 void num_to_bytes(uint64_t n, size_t len, uint8_t* dest)
 {
        while (len--) {
@@ -182,12 +199,22 @@ uint64_t bytes_to_num(uint8_t* src, size_t len)
        return num;
 }
 
-void num_to_bytebits(uint64_t  n, size_t len, uint8_t *dest) {
+// takes a number (uint64_t) and creates a binarray in dest.
+void num_to_bytebits(uint64_t n, size_t len, uint8_t *dest) {
        while (len--) {
                dest[len] = n & 1;
                n >>= 1;
        }
 }
+//least significant bit first
+void num_to_bytebitsLSBF(uint64_t n, size_t len, uint8_t *dest)
+{
+       for(int i = 0 ; i < len ; ++i) {
+               dest[i] =  n & 1;
+               n >>= 1;
+       }
+}
+
 
 // aa,bb,cc,dd,ee,ff,gg,hh, ii,jj,kk,ll,mm,nn,oo,pp
 // to
@@ -205,6 +232,8 @@ uint8_t *SwapEndian64(const uint8_t *src, const size_t len, const uint8_t blockS
        return tmp;
 }
 
+// takes a uint8_t src array, for len items and reverses the byte order in blocksizes (8,16,32,64), 
+// returns: the dest array contains the reordered src array.
 void SwapEndian64ex(const uint8_t *src, const size_t len, const uint8_t blockSize, uint8_t *dest){
        for (uint8_t block=0; block < (uint8_t)(len/blockSize); block++){
                for (size_t i = 0; i < blockSize; i++){
@@ -213,7 +242,6 @@ void SwapEndian64ex(const uint8_t *src, const size_t len, const uint8_t blockSiz
        }
 }
 
-
 //  -------------------------------------------------------------------------
 //  string parameters lib
 //  -------------------------------------------------------------------------
@@ -478,6 +506,7 @@ void wiegand_add_parity(uint8_t *target, uint8_t *source, uint8_t length)
     *(target)= GetParity(source + length / 2, ODD, length / 2);
 }
 
+// xor two arrays together for len items.  The dst array contains the new xored values.
 void xor(unsigned char * dst, unsigned char * src, size_t len) {
    for( ; len > 0; len--,dst++,src++)
        *dst ^= *src;
@@ -487,6 +516,7 @@ int32_t le24toh (uint8_t data[3]) {
     return (data[2] << 16) | (data[1] << 8) | data[0];
 }
 
+// Pack a bitarray into a uint32_t.  
 uint32_t PackBits(uint8_t start, uint8_t len, uint8_t* bits) {
 
        if (len > 32) return 0;
@@ -503,10 +533,19 @@ uint32_t PackBits(uint8_t start, uint8_t len, uint8_t* bits) {
 
 // RotateLeft - Ultralight, Desfire, works on byte level
 // 00-01-02  >> 01-02-00
-void rol(uint8_t *data, const size_t len){
+void rol(uint8_t *data, const size_t len){     
     uint8_t first = data[0];
     for (size_t i = 0; i < len-1; i++) {
         data[i] = data[i+1];
     }
     data[len-1] = first;
+}
+
+// Swap bit order on a uint32_t value.  Can be limited by nrbits just use say 8bits reversal
+uint32_t SwapBits(uint32_t value, int nrbits) {
+       uint32_t newvalue = 0;
+       for(int i = 0; i < nrbits; i++) {
+               newvalue ^= ((value >> i) & 1) << (nrbits - 1 - i);
+       }
+       return newvalue;
 }
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