Use const pointer to source in base64 and hex routines.

diff --git a/src/utils.c b/src/utils.c
index ab426ab..022ac25 100644 (file)
--- a/src/utils.c
+++ b/src/utils.c
@@ -46,14 +46,14 @@ static int charb64decode(char c) {
                return 63;
 }
 
-int hex2bin(char *src, char *dst, int length) {
+int hex2bin(const char *src, char *dst, int length) {
        int i;
        for(i = 0; i < length && src[i * 2] && src[i * 2 + 1]; i++)
                dst[i] = charhex2bin(src[i * 2]) * 16 + charhex2bin(src[i * 2 + 1]);
        return i;
 }
 
-int bin2hex(char *src, char *dst, int length) {
+int bin2hex(const char *src, char *dst, int length) {
        int i;
        for(i = length - 1; i >= 0; i--) {
                dst[i * 2 + 1] = hexadecimals[(unsigned char) src[i] & 15];
@@ -63,7 +63,7 @@ int bin2hex(char *src, char *dst, int length) {
        return length * 2;
 }
 
-int b64decode(char *src, char *dst, int length) {
+int b64decode(const char *src, char *dst, int length) {
        int i;
        uint32_t triplet = 0;
        unsigned char *udst = dst;
@@ -90,7 +90,7 @@ int b64decode(char *src, char *dst, int length) {
        }
 }
 
-int b64encode(char *src, char *dst, int length) {
+int b64encode(const char *src, char *dst, int length) {
        uint32_t triplet;
        const unsigned char *usrc = src;
        int si = length / 3 * 3;

diff --git a/src/utils.h b/src/utils.h
index 648a607..67c94f3 100644 (file)
--- a/src/utils.h
+++ b/src/utils.h
@@ -21,11 +21,11 @@
 #ifndef __TINC_UTILS_H__
 #define __TINC_UTILS_H__
 
-extern int hex2bin(char *src, char *dst, int length);
-extern int bin2hex(char *src, char *dst, int length);
+extern int hex2bin(const char *src, char *dst, int length);
+extern int bin2hex(const char *src, char *dst, int length);
 
-extern int b64encode(char *src, char *dst, int length);
-extern int b64decode(char *src, char *dst, int length);
+extern int b64encode(const char *src, char *dst, int length);
+extern int b64decode(const char *src, char *dst, int length);
 
 #ifdef HAVE_MINGW
 extern const char *winerror(int);