X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=include%2Fwimlib%2Funaligned.h;h=34240bd0b6e5669b9da266d7b9f9f4099a5bc2a4;hp=d30c9f200704735df1c9d368cb4db5a9214b4c8a;hb=aa3a2830cd4154238bc6a342ffea43d9ac69a14c;hpb=1c1c12926f4de39cb35d8d4c5a5280ab0d6ba931

diff --git a/include/wimlib/unaligned.h b/include/wimlib/unaligned.h
index d30c9f20..34240bd0 100644
--- a/include/wimlib/unaligned.h
+++ b/include/wimlib/unaligned.h
@@ -3,6 +3,9 @@
  *
  * Inline functions for unaligned memory accesses.
  *
+ * Author:	Eric Biggers
+ * Year:	2014, 2015
+ *
  * The author dedicates this file to the public domain.
  * You can do whatever you want with this file.
  */
@@ -10,9 +13,9 @@
 #ifndef _WIMLIB_UNALIGNED_H
 #define _WIMLIB_UNALIGNED_H
 
-#include "compiler.h"
-#include "endianness.h"
-#include "types.h"
+#include "wimlib/compiler.h"
+#include "wimlib/endianness.h"
+#include "wimlib/types.h"
 
 #define DEFINE_UNALIGNED_TYPE(type)				\
 struct type##_unaligned {					\
@@ -31,8 +34,113 @@ store_##type##_unaligned(type val, void *p)			\
 	((struct type##_unaligned *)p)->v = val;		\
 }
 
+DEFINE_UNALIGNED_TYPE(u16);
+DEFINE_UNALIGNED_TYPE(u32);
+DEFINE_UNALIGNED_TYPE(u64);
 DEFINE_UNALIGNED_TYPE(le16);
 DEFINE_UNALIGNED_TYPE(le32);
 DEFINE_UNALIGNED_TYPE(le64);
+DEFINE_UNALIGNED_TYPE(be16);
+DEFINE_UNALIGNED_TYPE(be32);
+DEFINE_UNALIGNED_TYPE(be64);
+DEFINE_UNALIGNED_TYPE(size_t);
+DEFINE_UNALIGNED_TYPE(machine_word_t);
+
+#define load_word_unaligned	load_machine_word_t_unaligned
+#define store_word_unaligned	store_machine_word_t_unaligned
+
+static inline u16
+get_unaligned_u16_le(const void *p)
+{
+	u16 v;
+
+	if (UNALIGNED_ACCESS_IS_FAST) {
+		v = le16_to_cpu(load_le16_unaligned(p));
+	} else {
+		const u8 *p8 = p;
+		v = 0;
+		v |= (u16)p8[0] << 0;
+		v |= (u16)p8[1] << 8;
+	}
+	return v;
+}
+
+static inline u32
+get_unaligned_u32_le(const void *p)
+{
+	u32 v;
+
+	if (UNALIGNED_ACCESS_IS_FAST) {
+		v = le32_to_cpu(load_le32_unaligned(p));
+	} else {
+		const u8 *p8 = p;
+		v = 0;
+		v |= (u32)p8[0] << 0;
+		v |= (u32)p8[1] << 8;
+		v |= (u32)p8[2] << 16;
+		v |= (u32)p8[3] << 24;
+	}
+	return v;
+}
+
+static inline void
+put_unaligned_u16_le(u16 v, void *p)
+{
+	if (UNALIGNED_ACCESS_IS_FAST) {
+		store_le16_unaligned(cpu_to_le16(v), p);
+	} else {
+		u8 *p8 = p;
+		p8[0] = (v >> 0) & 0xFF;
+		p8[1] = (v >> 8) & 0xFF;
+	}
+}
+
+static inline void
+put_unaligned_u32_le(u32 v, void *p)
+{
+	if (UNALIGNED_ACCESS_IS_FAST) {
+		store_le32_unaligned(cpu_to_le32(v), p);
+	} else {
+		u8 *p8 = p;
+		p8[0] = (v >> 0) & 0xFF;
+		p8[1] = (v >> 8) & 0xFF;
+		p8[2] = (v >> 16) & 0xFF;
+		p8[3] = (v >> 24) & 0xFF;
+	}
+}
+
+/*
+ * Given a 32-bit value that was loaded with the platform's native endianness,
+ * return a 32-bit value whose high-order 8 bits are 0 and whose low-order 24
+ * bits contain the first 3 bytes, arranged in octets in a platform-dependent
+ * order, at the memory location from which the input 32-bit value was loaded.
+ */
+static inline u32
+loaded_u32_to_u24(u32 v)
+{
+	if (CPU_IS_LITTLE_ENDIAN)
+		return v & 0xFFFFFF;
+	else
+		return v >> 8;
+}
+
+/*
+ * Load the next 3 bytes from the memory location @p into the 24 low-order bits
+ * of a 32-bit value.  The order in which the 3 bytes will be arranged as octets
+ * in the 24 bits is platform-dependent.  At least LOAD_U24_REQUIRED_NBYTES
+ * bytes must be available at @p; note that this may be more than 3.
+ */
+static inline u32
+load_u24_unaligned(const u8 *p)
+{
+#if UNALIGNED_ACCESS_IS_FAST
+#  define LOAD_U24_REQUIRED_NBYTES 4
+	return loaded_u32_to_u24(load_u32_unaligned(p));
+#else
+#  define LOAD_U24_REQUIRED_NBYTES 3
+	return ((u32)p[0] << 0) | ((u32)p[1] << 8) | ((u32)p[2] << 16);
+#endif
+}
+
 
 #endif /* _WIMLIB_UNALIGNED_H */