FIX, Coverity, Unsigned compared against 0. CID #212326, keyNBr will never be negative.

[proxmark3-svn] / client / cmdlfem4x.c

diff --git a/client/cmdlfem4x.c b/client/cmdlfem4x.c
index c167f456f646faa378545697a83fc7ed4533c8ad..f3c754ff5c3a7128889a24fe360a8625c1ba7373 100644 (file)
--- a/client/cmdlfem4x.c
+++ b/client/cmdlfem4x.c
@@ -20,6 +20,9 @@
 #include "cmdlf.h"
 #include "cmdlfem4x.h"
 #include "lfdemod.h"
+
+#define llx PRIx64
+
 char *global_em410xId;
 
 static int CmdHelp(const char *Cmd);
@@ -70,22 +73,23 @@ int CmdEM410xSim(const char *Cmd)
        uint8_t uid[5] = {0x00};
 
        if (cmdp == 'h' || cmdp == 'H') {
-               PrintAndLog("Usage:  lf em4x em410xsim <UID>");
+               PrintAndLog("Usage:  lf em4x em410xsim <UID> <clock>");
                PrintAndLog("");
                PrintAndLog("     sample: lf em4x em410xsim 0F0368568B");
                return 0;
        }
+       /* clock is 64 in EM410x tags */
+       uint8_t clock = 64;
 
        if (param_gethex(Cmd, 0, uid, 10)) {
                PrintAndLog("UID must include 10 HEX symbols");
                return 0;
        }
+       param_getdec(Cmd, 1, &clock);
        
-       PrintAndLog("Starting simulating UID %02X%02X%02X%02X%02X", uid[0],uid[1],uid[2],uid[3],uid[4]);
+       PrintAndLog("Starting simulating UID %02X%02X%02X%02X%02X  clock: %d", uid[0],uid[1],uid[2],uid[3],uid[4],clock);
        PrintAndLog("Press pm3-button to about simulation");
 
-       /* clock is 64 in EM410x tags */
-       int clock = 64;
 
        /* clear our graph */
        ClearGraph(0);
@@ -169,7 +173,7 @@ int CmdEM410xWrite(const char *Cmd)
 {
        uint64_t id = 0xFFFFFFFFFFFFFFFF; // invalid id value
        int card = 0xFF; // invalid card value
-       unsigned int clock = 0; // invalid clock value
+       uint32_t clock = 0; // invalid clock value
 
        sscanf(Cmd, "%" PRIx64 " %d %d", &id, &card, &clock);
 
@@ -194,21 +198,13 @@ int CmdEM410xWrite(const char *Cmd)
        }
 
        // Check Clock
-       if (card == 1)
-       {
                // Default: 64
-               if (clock == 0)
-                       clock = 64;
+       if (clock == 0)
+               clock = 64;
 
-               // Allowed clock rates: 16, 32 and 64
-               if ((clock != 16) && (clock != 32) && (clock != 64)) {
-                       PrintAndLog("Error! Clock rate %d not valid. Supported clock rates are 16, 32 and 64.\n", clock);
-                       return 0;
-               }
-       }
-       else if (clock != 0)
-       {
-               PrintAndLog("Error! Clock rate is only supported on T55x7 tags.\n");
+       // Allowed clock rates: 16, 32, 40 and 64
+       if ((clock != 16) && (clock != 32) && (clock != 64) && (clock != 40)) {
+               PrintAndLog("Error! Clock rate %d not valid. Supported clock rates are 16, 32, 40 and 64.\n", clock);
                return 0;
        }
 
@@ -218,18 +214,17 @@ int CmdEM410xWrite(const char *Cmd)
                //   provide for backwards-compatibility for older firmware, and to avoid
                //   having to add another argument to CMD_EM410X_WRITE_TAG, we just store
                //   the clock rate in bits 8-15 of the card value
-               card = (card & 0xFF) | (((uint64_t)clock << 8) & 0xFF00);
-       }
-       else if (card == 0)
+               card = (card & 0xFF) | ((clock << 8) & 0xFF00);
+       }       else if (card == 0) {
                PrintAndLog("Writing %s tag with UID 0x%010" PRIx64, "T5555", id, clock);
-       else {
+               card = (card & 0xFF) | ((clock << 8) & 0xFF00);
+       } else {
                PrintAndLog("Error! Bad card type selected.\n");
                return 0;
        }
 
        UsbCommand c = {CMD_EM410X_WRITE_TAG, {card, (uint32_t)(id >> 32), (uint32_t)id}};
        SendCommand(&c);
-
        return 0;
 }