added hex_to_bytes

client/util.c

@@ -394,6 +394,47 @@ void print_blocks(uint32_t *data, size_t len) {
     }
 }
 
+int hex_to_bytes(const char *hexValue, uint8_t *bytesValue, size_t maxBytesValueLen) {
+    char buf[3];
+    int indx = 0;
+    int bytesValueLen = 0;
+    while (hexValue[indx]) {
+        if (hexValue[indx] == '\t' || hexValue[indx] == ' ') {
+            indx++;
+            continue;
+        }
+
+        if (isxdigit(hexValue[indx])) {
+            buf[strlen(buf) + 1] = 0x00;
+            buf[strlen(buf)] = hexValue[indx];
+        } else {
+            // if we have symbols other than spaces and hex
+            return -1;
+        }
+
+        if (maxBytesValueLen && bytesValueLen >= maxBytesValueLen) {
+            // if we dont have space in buffer and have symbols to translate
+            return -2;
+        }
+
+        if (strlen(buf) >= 2) {
+            uint32_t temp = 0;
+            sscanf(buf, "%x", &temp);
+            bytesValue[bytesValueLen] = (uint8_t)(temp & 0xff);
+            buf[0] = 0;
+            bytesValueLen++;
+        }
+
+        indx++;
+    }
+
+    if (strlen(buf) > 0)
+        //error when not completed hex bytes
+        return -3;
+
+    return bytesValueLen; 
+}
+
 // 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--) {

client/util.h

@@ -55,6 +55,7 @@ char *sprint_ascii_ex(const uint8_t *data, const size_t len, const size_t min_st
 
 void print_blocks(uint32_t *data, size_t len);
 
+int hex_to_bytes(const char *hexValue, uint8_t *bytesValue, size_t maxBytesValueLen);
 void num_to_bytebits(uint64_t n, size_t len, uint8_t *dest);
 void num_to_bytebitsLSBF(uint64_t n, size_t len, uint8_t *dest);
 uint8_t *SwapEndian64(const uint8_t *src, const size_t len, const uint8_t blockSize);