[mkromfs] fix build on macos
This change removes the dependency on the linux endian header.
Change-Id: Ic925e514e573b42994152cf8dbc8909e01642ef4
diff --git a/src/virtualization/buildtools/mkromfs.cc b/src/virtualization/buildtools/mkromfs.cc
index 659375d..90ed7ae 100644
--- a/src/virtualization/buildtools/mkromfs.cc
+++ b/src/virtualization/buildtools/mkromfs.cc
@@ -2,8 +2,6 @@
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
-#include <endian.h>
-
#include <algorithm>
#include <fstream>
#include <iostream>
@@ -50,8 +48,20 @@
// Write value as big-endian to the stream.
uint32_t write(std::ostream& s, uint32_t value) {
- uint32_t value_be = htobe32(value);
- return write(s, reinterpret_cast<char*>(&value_be), sizeof(value_be), sizeof(value_be));
+ union pun {
+ uint32_t u;
+ char c[sizeof(u)];
+ };
+ static constexpr const pun test{0x11223344};
+ if (test.c[0] == 0x11) {
+ return write(s, reinterpret_cast<char*>(&value), sizeof(value), sizeof(value));
+ }
+ pun le = {value};
+ pun be{};
+ for (size_t i = 0; i < sizeof(le.u); ++i) {
+ be.c[i] = le.c[sizeof(le.u) - 1 - i];
+ }
+ return write(s, reinterpret_cast<char*>(&be), sizeof(be), sizeof(be));
}
// Read the entire contents of the specified file and return it in a char vector.
