2 * unaligned.h - inline functions for unaligned memory accesses
4 * Copyright 2022 Eric Biggers
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28 #ifndef _WIMLIB_UNALIGNED_H
29 #define _WIMLIB_UNALIGNED_H
33 #include "wimlib/compiler.h"
34 #include "wimlib/endianness.h"
35 #include "wimlib/types.h"
37 #define DEFINE_UNALIGNED_TYPE(type) \
38 static forceinline type \
39 load_##type##_unaligned(const void *p) \
42 memcpy(&v, p, sizeof(v)); \
46 static forceinline void \
47 store_##type##_unaligned(type v, void *p) \
49 memcpy(p, &v, sizeof(v)); \
52 DEFINE_UNALIGNED_TYPE(u16);
53 DEFINE_UNALIGNED_TYPE(u32);
54 DEFINE_UNALIGNED_TYPE(u64);
55 DEFINE_UNALIGNED_TYPE(le16);
56 DEFINE_UNALIGNED_TYPE(le32);
57 DEFINE_UNALIGNED_TYPE(le64);
58 DEFINE_UNALIGNED_TYPE(be16);
59 DEFINE_UNALIGNED_TYPE(be32);
60 DEFINE_UNALIGNED_TYPE(be64);
61 DEFINE_UNALIGNED_TYPE(size_t);
62 DEFINE_UNALIGNED_TYPE(machine_word_t);
64 #define load_word_unaligned load_machine_word_t_unaligned
65 #define store_word_unaligned store_machine_word_t_unaligned
67 static forceinline u16
68 get_unaligned_le16(const u8 *p)
70 if (UNALIGNED_ACCESS_IS_FAST)
71 return le16_to_cpu(load_le16_unaligned(p));
73 return ((u16)p[1] << 8) | p[0];
76 static forceinline u32
77 get_unaligned_le32(const u8 *p)
79 if (UNALIGNED_ACCESS_IS_FAST)
80 return le32_to_cpu(load_le32_unaligned(p));
82 return ((u32)p[3] << 24) | ((u32)p[2] << 16) |
83 ((u32)p[1] << 8) | p[0];
86 static forceinline u32
87 get_unaligned_be32(const u8 *p)
89 if (UNALIGNED_ACCESS_IS_FAST)
90 return be32_to_cpu(load_be32_unaligned(p));
92 return ((u32)p[0] << 24) | ((u32)p[1] << 16) |
93 ((u32)p[2] << 8) | p[3];
96 static forceinline void
97 put_unaligned_le16(u16 v, u8 *p)
99 if (UNALIGNED_ACCESS_IS_FAST) {
100 store_le16_unaligned(cpu_to_le16(v), p);
107 static forceinline void
108 put_unaligned_le32(u32 v, u8 *p)
110 if (UNALIGNED_ACCESS_IS_FAST) {
111 store_le32_unaligned(cpu_to_le32(v), p);
115 p[2] = (u8)(v >> 16);
116 p[3] = (u8)(v >> 24);
120 static forceinline void
121 put_unaligned_be32(u32 v, u8 *p)
123 if (UNALIGNED_ACCESS_IS_FAST) {
124 store_be32_unaligned(cpu_to_be32(v), p);
126 p[0] = (u8)(v >> 24);
127 p[1] = (u8)(v >> 16);
133 #endif /* _WIMLIB_UNALIGNED_H */