SUPPORT-8592. Добавлен hex_to_bin()

src/utils/str_t.c

@@ -49,3 +49,51 @@ str_t_to_string(const str_t* str)
 
     return string;
 }
+
+
+static int 
+char2int(char input)
+{
+    if (input >= '0' && input <= '9') {
+        return input - '0';
+    }
+
+    if (input >= 'A' && input <= 'F') {
+        return input - 'A' + 10;
+    }
+
+    if (input >= 'a' && input <= 'f') {
+        return input - 'a' + 10;
+    }
+    
+    LOG_ERROR("char2int exit with error: invalid argument, '%c'", input);
+    assert("char2int exit with error: invalid argument");
+    return -1;
+}
+
+
+int 
+hex_to_bin(const str_t* hex, /*out*/ str_t* bin)
+{
+    bin->len = hex->len / 2;
+    bin->data = malloc(bin->len + 1);
+    if (bin->data == NULL) {
+        LOG_ERROR("Could not allocate memory for bin value (%zd bytes)", bin->len + 1);
+        goto error;
+    }
+
+    const char* src = hex->data;
+    char* dst = bin->data;
+
+    while (*src && src[1]) {
+        *(dst++) = char2int(*src)*16 + char2int(src[1]);
+        src += 2;
+    }
+
+    return 0;
+
+error:
+    str_t_clear(bin);
+    LOG_ERROR("hex2bin exit with error");
+    return -1;
+}

src/utils/str_t.h

@@ -92,4 +92,6 @@ int str_t_copy(str_t* dst, const str_t* src);
 
 char* str_t_to_string(const str_t* str);
 
+int hex_to_bin(const str_t* hex, /*out*/ str_t* bin);
+
 #endif // STR_T_H_INCLUDED