1  /* SPDX-License-Identifier: GPL-2.0-only */
2  /*
3   * Copyright 2023 Red Hat
4   */
5  
6  #ifndef UDS_NUMERIC_H
7  #define UDS_NUMERIC_H
8  
9  #include <linux/unaligned.h>
10  #include <linux/kernel.h>
11  #include <linux/types.h>
12  
13  /*
14   * These utilities encode or decode a number from an offset in a larger data buffer and then
15   * advance the offset pointer to the next field in the buffer.
16   */
17  
decode_s64_le(const u8 * buffer,size_t * offset,s64 * decoded)18  static inline void decode_s64_le(const u8 *buffer, size_t *offset, s64 *decoded)
19  {
20  	*decoded = get_unaligned_le64(buffer + *offset);
21  	*offset += sizeof(s64);
22  }
23  
encode_s64_le(u8 * data,size_t * offset,s64 to_encode)24  static inline void encode_s64_le(u8 *data, size_t *offset, s64 to_encode)
25  {
26  	put_unaligned_le64(to_encode, data + *offset);
27  	*offset += sizeof(s64);
28  }
29  
decode_u64_le(const u8 * buffer,size_t * offset,u64 * decoded)30  static inline void decode_u64_le(const u8 *buffer, size_t *offset, u64 *decoded)
31  {
32  	*decoded = get_unaligned_le64(buffer + *offset);
33  	*offset += sizeof(u64);
34  }
35  
encode_u64_le(u8 * data,size_t * offset,u64 to_encode)36  static inline void encode_u64_le(u8 *data, size_t *offset, u64 to_encode)
37  {
38  	put_unaligned_le64(to_encode, data + *offset);
39  	*offset += sizeof(u64);
40  }
41  
decode_s32_le(const u8 * buffer,size_t * offset,s32 * decoded)42  static inline void decode_s32_le(const u8 *buffer, size_t *offset, s32 *decoded)
43  {
44  	*decoded = get_unaligned_le32(buffer + *offset);
45  	*offset += sizeof(s32);
46  }
47  
encode_s32_le(u8 * data,size_t * offset,s32 to_encode)48  static inline void encode_s32_le(u8 *data, size_t *offset, s32 to_encode)
49  {
50  	put_unaligned_le32(to_encode, data + *offset);
51  	*offset += sizeof(s32);
52  }
53  
decode_u32_le(const u8 * buffer,size_t * offset,u32 * decoded)54  static inline void decode_u32_le(const u8 *buffer, size_t *offset, u32 *decoded)
55  {
56  	*decoded = get_unaligned_le32(buffer + *offset);
57  	*offset += sizeof(u32);
58  }
59  
encode_u32_le(u8 * data,size_t * offset,u32 to_encode)60  static inline void encode_u32_le(u8 *data, size_t *offset, u32 to_encode)
61  {
62  	put_unaligned_le32(to_encode, data + *offset);
63  	*offset += sizeof(u32);
64  }
65  
decode_u16_le(const u8 * buffer,size_t * offset,u16 * decoded)66  static inline void decode_u16_le(const u8 *buffer, size_t *offset, u16 *decoded)
67  {
68  	*decoded = get_unaligned_le16(buffer + *offset);
69  	*offset += sizeof(u16);
70  }
71  
encode_u16_le(u8 * data,size_t * offset,u16 to_encode)72  static inline void encode_u16_le(u8 *data, size_t *offset, u16 to_encode)
73  {
74  	put_unaligned_le16(to_encode, data + *offset);
75  	*offset += sizeof(u16);
76  }
77  
78  #endif /* UDS_NUMERIC_H */
79