add simple hex reading to file_reader.h

profezzorn · Oct 13, 2024 · 05995be · 05995be
1 parent eb9782d
commit 05995be
Showing 1 changed file with 13 additions and 0 deletions.
diff --git a/common/file_reader.h b/common/file_reader.h
@@ -198,6 +198,19 @@ class FileReader {
       return -1;
     }
   }
+  int ReadHex1() {
+    int c = Read();
+    if (c >= '0' && c <= '9') return c - '0';
+    if (c >= 'a' && c <= 'f') return c - 'a' + 10;
+    if (c >= 'A' && c <= 'F') return c - 'A' + 10;
+    return -1;
+  }
+  int ReadHex2() {
+    int a = ReadHex1();
+    int b = ReadHex2();
+    if (a == -1 || b == -1) return -1;
+    return (a << 4) | b;
+  }
   int Write(const uint8_t* dest, int bytes) {
     RUN_ALL(write(dest, bytes))
     return 0;