Refactor headers

[wimlib] / include / wimlib / endianness.h

diff --git a/include/wimlib/endianness.h b/include/wimlib/endianness.h
new file mode 100644 (file)
index 0000000..2d1e9a6
--- /dev/null
+++ b/include/wimlib/endianness.h
@@ -0,0 +1,85 @@
+#ifndef _WIMLIB_ENDIANNESS_H
+#define _WIMLIB_ENDIANNESS_H
+
+#include "wimlib/types.h"
+
+/* Watch out for conflict with ntfs-3g/endian.h ... */
+
+#ifndef _NTFS_ENDIANS_H
+
+static inline u16
+bswap16(u16 n)
+{
+       return (n << 8) | (n >> 8);
+}
+
+static inline u32
+bswap32(u32 n)
+{
+#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
+       return __builtin_bswap32(n);
+#else
+       return (n << 24) | ((n & 0xff00) << 8) | ((n & 0xff0000) >> 8) |
+                                                       (n >> 24);
+#endif
+}
+
+static inline u64
+bswap64(u64 n)
+{
+#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
+       return __builtin_bswap64(n);
+#else
+       return (n << 56) | ((n & 0xff00) << 40) | ((n & 0xff0000) << 24) |
+                       ((n & 0xff000000) << 8) | ((n & 0xff00000000) >> 8) |
+                       ((n & 0xff0000000000) >> 24) |
+                       ((n & 0xff000000000000) >> 40) | (n >> 56);
+#endif
+}
+
+#  ifdef WORDS_BIGENDIAN
+#    define le16_to_cpu(n) bswap16(n)
+#    define le32_to_cpu(n) bswap32(n)
+#    define le64_to_cpu(n) bswap64(n)
+#    define cpu_to_le16(n) bswap16(n)
+#    define cpu_to_le32(n) bswap32(n)
+#    define cpu_to_le64(n) bswap64(n)
+#  else
+#    define cpu_to_le16(n) (n)
+#    define cpu_to_le32(n) (n)
+#    define cpu_to_le64(n) (n)
+#    define le16_to_cpu(n) (n)
+#    define le32_to_cpu(n) (n)
+#    define le64_to_cpu(n) (n)
+#  endif
+#endif /* _NTFS_ENDIANS_H */
+
+static inline void
+array_cpu_to_le32(u32 *p, size_t n)
+{
+       for (size_t i = 0; i < n; i++)
+               p[i] = cpu_to_le32(p[i]);
+}
+
+static inline void
+array_le32_to_cpu(u32 *p, size_t n)
+{
+       for (size_t i = 0; i < n; i++)
+               p[i] = le32_to_cpu(p[i]);
+}
+
+static inline void
+array_cpu_to_le64(u64 *p, size_t n)
+{
+       for (size_t i = 0; i < n; i++)
+               p[i] = cpu_to_le64(p[i]);
+}
+
+static inline void
+array_le64_to_cpu(u64 *p, size_t n)
+{
+       for (size_t i = 0; i < n; i++)
+               p[i] = le64_to_cpu(p[i]);
+}
+
+#endif /* _WIMLIB_ENDIANNESS_H */