refactor: move hexdump API to utils.h

src/utils/utils.h

@@ -0,0 +1,63 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include <stdint.h>
+#include <stdio.h>
+
+static inline void hexdump_to_fd(int fd, uint32_t idx, const char *data, uint16_t len)
+{
+    uint16_t i = 0;
+    uint16_t used = 0;
+    uint16_t offset = 0;
+
+#define LINE_LEN 80
+    char line[LINE_LEN]; /* space needed 8+16*3+3+16 == 75 */
+    while (offset < len)
+    {
+        used = snprintf(line, LINE_LEN, "%08X ", idx + offset);
+
+        // hexdump
+        for (i = 0; ((offset + i) < len) && (i < 16); i++)
+        {
+            if (i == 8)
+            {
+                used += snprintf(line + used, LINE_LEN - used, " ");
+            }
+            used += snprintf(line + used, LINE_LEN - used, " %02x", (data[offset + i] & 0xff));
+        }
+
+        // padding
+        for (; i <= 16; i++)
+        {
+            if (i == 8)
+            {
+                used += snprintf(line + used, LINE_LEN - used, " ");
+            }
+            used += snprintf(line + used, LINE_LEN - used, "   ");
+        }
+
+        // ascii
+        for (i = 0; (offset < len) && (i < 16); i++, offset++)
+        {
+            unsigned char c = data[offset];
+            if ((c < ' ') || (c > '~'))
+            {
+                c = '.';
+            }
+            if (i == 8)
+            {
+                used += snprintf(line + used, LINE_LEN - used, " ");
+            }
+            used += snprintf(line + used, LINE_LEN - used, "%c", c);
+        }
+        dprintf(fd, "%s\n", line);
+    }
+}
+
+#ifdef __cplusplus
+}
+#endif