X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/f7e3ed82874bfd8951c90536bd7185d599d6dbf8..8e4021fddc4f81fff43a64036a4ecc0278b1552d:/armsrc/util.c

diff --git a/armsrc/util.c b/armsrc/util.c
index ae6408cf..1716a113 100644
--- a/armsrc/util.c
+++ b/armsrc/util.c
@@ -1,90 +1,103 @@
 //-----------------------------------------------------------------------------
-// Utility functions used in many places, not specific to any piece of code.
 // Jonathan Westhues, Sept 2005
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// Utility functions used in many places, not specific to any piece of code.
 //-----------------------------------------------------------------------------
-#include "proxmark3.h"
+
 #include "util.h"
 
-void *memcpy(void *dest, const void *src, int len)
-{
-	uint8_t *d = dest;
-	const uint8_t *s = src;
-	while((len--) > 0) {
-		*d = *s;
-		d++;
-		s++;
+void print_result(char *name, uint8_t *buf, size_t len) {
+	uint8_t *p = buf;
+
+	if ( len % 16 == 0 ) {
+		for(; p-buf < len; p += 16)
+			Dbprintf("[%s:%d/%d] %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
+				name,
+				p-buf,
+				len,
+				p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7],p[8], p[9], p[10], p[11], p[12], p[13], p[14], p[15]
+			);
 	}
-	return dest;
-}
-
-void *memset(void *dest, int c, int len)
-{
-	uint8_t *d = dest;
-	while((len--) > 0) {
-		*d = c;
-		d++;
+	else {
+		for(; p-buf < len; p += 8)
+			Dbprintf("[%s:%d/%d] %02x %02x %02x %02x %02x %02x %02x %02x",
+				name,
+				p-buf,
+				len,
+				p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
 	}
-	return dest;
 }
 
-int memcmp(const void *av, const void *bv, int len)
-{
-	const uint8_t *a = av;
-	const uint8_t *b = bv;
-
-	while((len--) > 0) {
-		if(*a != *b) {
-			return *a - *b;
-		}
-		a++;
-		b++;
-	}
-	return 0;
+size_t nbytes(size_t nbits) {
+	return (nbits >> 3)+((nbits % 8) > 0);
 }
 
-int strlen(const char *str)
-{
-	int l = 0;
-	while(*str) {
-		l++;
-		str++;
+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 l;
+	return newvalue;
 }
 
-char* strncat(char *dest, const char *src, unsigned int n)
-{
-	unsigned int dest_len = strlen(dest);
-	unsigned int i;
-
-	for (i = 0 ; i < n && src[i] != '\0' ; i++)
-		dest[dest_len + i] = src[i];
-	dest[dest_len + i] = '\0';
-
-	return dest;
+/*
+ ref  http://www.csm.ornl.gov/~dunigan/crc.html
+ Returns the value v with the bottom b [0,32] bits reflected. 
+ Example: reflect(0x3e23L,3) == 0x3e26
+*/
+uint32_t reflect(uint32_t v, int b) {
+	uint32_t t = v;
+	for ( int i = 0; i < b; ++i) {
+		if (t & 1)
+			v |=  BITMASK((b-1)-i);
+		else
+			v &= ~BITMASK((b-1)-i);
+		t >>= 1;
+	}
+	return v;
 }
 
-void num_to_bytes(uint64_t n, size_t len, uint8_t* dest)
-{
+void num_to_bytes(uint64_t n, size_t len, uint8_t* dest) {
 	while (len--) {
 		dest[len] = (uint8_t) n;
 		n >>= 8;
 	}
 }
 
-uint64_t bytes_to_num(uint8_t* src, size_t len)
-{
+uint64_t bytes_to_num(uint8_t* src, size_t len) {
 	uint64_t num = 0;
-	while (len--)
-	{
+	while (len--) {
 		num = (num << 8) | (*src);
 		src++;
 	}
 	return num;
 }
 
-void LEDsoff()
-{
+// RotateLeft - Ultralight, Desfire
+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;
+}
+
+void lsl (uint8_t *data, size_t len) {
+    for (size_t n = 0; n < len - 1; n++) {
+        data[n] = (data[n] << 1) | (data[n+1] >> 7);
+    }
+    data[len - 1] <<= 1;
+}
+
+int32_t le24toh (uint8_t data[3]) {
+    return (data[2] << 16) | (data[1] << 8) | data[0];
+}
+
+void LEDsoff() {
 	LED_A_OFF();
 	LED_B_OFF();
 	LED_C_OFF();
@@ -92,8 +105,7 @@ void LEDsoff()
 }
 
 // LEDs: R(C) O(A) G(B) -- R(D) [1, 2, 4 and 8]
-void LED(int led, int ms)
-{
+void LED(int led, int ms) {
 	if (led & LED_RED)
 		LED_C_ON();
 	if (led & LED_ORANGE)
@@ -118,13 +130,11 @@ void LED(int led, int ms)
 		LED_D_OFF();
 }
 
-
 // Determine if a button is double clicked, single clicked,
 // not clicked, or held down (for ms || 1sec)
 // In general, don't use this function unless you expect a
 // double click, otherwise it will waste 500ms -- use BUTTON_HELD instead
-int BUTTON_CLICKED(int ms)
-{
+int BUTTON_CLICKED(int ms) {
 	// Up to 500ms in between clicks to mean a double click
 	int ticks = (48000 * (ms ? ms : 1000)) >> 10;
 
@@ -186,8 +196,7 @@ int BUTTON_CLICKED(int ms)
 }
 
 // Determine if a button is held down
-int BUTTON_HELD(int ms)
-{
+int BUTTON_HELD(int ms) {
 	// If button is held for one second
 	int ticks = (48000 * (ms ? ms : 1000)) >> 10;
 
@@ -224,66 +233,36 @@ int BUTTON_HELD(int ms)
 	return BUTTON_ERROR;
 }
 
-// attempt at high resolution microsecond timer
-// beware: timer counts in 21.3uS increments (1024/48Mhz)
-void SpinDelayUs(int us)
-{
-	int ticks = (48*us) >> 10;
-
-	// Borrow a PWM unit for my real-time clock
-	AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
-	// 48 MHz / 1024 gives 46.875 kHz
-	AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
-	AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
-	AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
-
-	uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
-
-	for(;;) {
-		uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
-		if (now == (uint16_t)(start + ticks))
-			return;
-
-		WDT_HIT();
-	}
-}
-
-void SpinDelay(int ms)
-{
-  // convert to uS and call microsecond delay function
-	SpinDelayUs(ms*1000);
-}
-
 /* Similar to FpgaGatherVersion this formats stored version information
  * into a string representation. It takes a pointer to the struct version_information,
  * verifies the magic properties, then stores a formatted string, prefixed by
  * prefix in dst.
  */
-void FormatVersionInformation(char *dst, int len, const char *prefix, void *version_information)
-{
+void FormatVersionInformation(char *dst, int len, const char *prefix, void *version_information) {
 	struct version_information *v = (struct version_information*)version_information;
 	dst[0] = 0;
-	strncat(dst, prefix, len);
+	strncat(dst, prefix, len-1);
 	if(v->magic != VERSION_INFORMATION_MAGIC) {
-		strncat(dst, "Missing/Invalid version information", len);
+		strncat(dst, "Missing/Invalid version information\n", len - strlen(dst) - 1);
 		return;
 	}
 	if(v->versionversion != 1) {
-		strncat(dst, "Version information not understood", len);
+		strncat(dst, "Version information not understood\n", len - strlen(dst) - 1);
 		return;
 	}
 	if(!v->present) {
-		strncat(dst, "Version information not available", len);
+		strncat(dst, "Version information not available\n", len - strlen(dst) - 1);
 		return;
 	}
 
-	strncat(dst, v->svnversion, len);
+	strncat(dst, v->gitversion, len - strlen(dst) - 1);
 	if(v->clean == 0) {
-		strncat(dst, "-unclean", len);
+		strncat(dst, "-unclean", len - strlen(dst) - 1);
 	} else if(v->clean == 2) {
-		strncat(dst, "-suspect", len);
+		strncat(dst, "-suspect", len - strlen(dst) - 1);
 	}
 
-	strncat(dst, " ", len);
-	strncat(dst, v->buildtime, len);
+	strncat(dst, " ", len - strlen(dst) - 1);
+	strncat(dst, v->buildtime, len - strlen(dst) - 1);
+	strncat(dst, "\n", len - strlen(dst) - 1);
 }