From e82b75f8f06e3fdf40b32e24d385e77b22f96709 Mon Sep 17 00:00:00 2001
From: Imbus <>
Date: Thu, 26 Jun 2025 12:03:02 +0200
Subject: [PATCH] Header: endian.h with endianness conversion functions

---
 lib/endian.h | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 lib/endian.h

diff --git a/lib/endian.h b/lib/endian.h
new file mode 100644
index 0000000..e6ea172
--- /dev/null
+++ b/lib/endian.h
@@ -0,0 +1,92 @@
+#ifndef ENDIAN_KERNEL_H
+#define ENDIAN_KERNEL_H
+
+#include <types.h>
+
+/** Swap byte order of 16-bit value */
+static inline u16 swap16(u16 x) { return (x >> 8) | (x << 8); }
+
+/** Swap byte order of 32-bit value */
+static inline u32 swap32(u32 x) {
+    return ((x >> 24) & 0x000000ff) | ((x >> 8) & 0x0000ff00) |
+           ((x << 8) & 0x00ff0000) | ((x << 24) & 0xff000000);
+}
+
+/** Swap byte order of 64-bit value */
+static inline u64 swap64(u64 x) {
+    return ((x >> 56) & 0x00000000000000ffULL) |
+           ((x >> 40) & 0x000000000000ff00ULL) |
+           ((x >> 24) & 0x0000000000ff0000ULL) |
+           ((x >> 8) & 0x00000000ff000000ULL) |
+           ((x << 8) & 0x000000ff00000000ULL) |
+           ((x << 24) & 0x0000ff0000000000ULL) |
+           ((x << 40) & 0x00ff000000000000ULL) |
+           ((x << 56) & 0xff00000000000000ULL);
+}
+
+#ifdef __LITTLE_ENDIAN__
+/** Convert 16-bit value to little-endian */
+static inline u16 to_le16(u16 x) { return x; }
+/** Convert 16-bit little-endian value to host */
+static inline u16 from_le16(u16 x) { return x; }
+
+/** Convert 32-bit value to little-endian */
+static inline u32 to_le32(u32 x) { return x; }
+/** Convert 32-bit little-endian value to host */
+static inline u32 from_le32(u32 x) { return x; }
+
+/** Convert 64-bit value to little-endian */
+static inline u64 to_le64(u64 x) { return x; }
+/** Convert 64-bit little-endian value to host */
+static inline u64 from_le64(u64 x) { return x; }
+
+/** Convert 16-bit value to big-endian */
+static inline u16 to_be16(u16 x) { return swap16(x); }
+/** Convert 16-bit big-endian value to host */
+static inline u16 from_be16(u16 x) { return swap16(x); }
+
+/** Convert 32-bit value to big-endian */
+static inline u32 to_be32(u32 x) { return swap32(x); }
+/** Convert 32-bit big-endian value to host */
+static inline u32 from_be32(u32 x) { return swap32(x); }
+
+/** Convert 64-bit value to big-endian */
+static inline u64 to_be64(u64 x) { return swap64(x); }
+/** Convert 64-bit big-endian value to host */
+static inline u64 from_be64(u64 x) { return swap64(x); }
+
+#else // Big-endian
+
+/** Convert 16-bit value to little-endian */
+static inline u16 to_le16(u16 x) { return swap16(x); }
+/** Convert 16-bit little-endian value to host */
+static inline u16 from_le16(u16 x) { return swap16(x); }
+
+/** Convert 32-bit value to little-endian */
+static inline u32 to_le32(u32 x) { return swap32(x); }
+/** Convert 32-bit little-endian value to host */
+static inline u32 from_le32(u32 x) { return swap32(x); }
+
+/** Convert 64-bit value to little-endian */
+static inline u64 to_le64(u64 x) { return swap64(x); }
+/** Convert 64-bit little-endian value to host */
+static inline u64 from_le64(u64 x) { return swap64(x); }
+
+/** Convert 16-bit value to big-endian */
+static inline u16 to_be16(u16 x) { return x; }
+/** Convert 16-bit big-endian value to host */
+static inline u16 from_be16(u16 x) { return x; }
+
+/** Convert 32-bit value to big-endian */
+static inline u32 to_be32(u32 x) { return x; }
+/** Convert 32-bit big-endian value to host */
+static inline u32 from_be32(u32 x) { return x; }
+
+/** Convert 64-bit value to big-endian */
+static inline u64 to_be64(u64 x) { return x; }
+/** Convert 64-bit big-endian value to host */
+static inline u64 from_be64(u64 x) { return x; }
+
+#endif // __LITTLE_ENDIAN__
+
+#endif // ENDIAN_KERNEL_H