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1 | #ifndef __CEPH_DECODE_H |
2 | #define __CEPH_DECODE_H |
3 | |
4 | #include <asm/unaligned.h> |
5 | #include <linux/time.h> |
6 | |
7 | #include "types.h" |
8 | |
9 | /* |
10 | * in all cases, |
11 | * void **p pointer to position pointer |
12 | * void *end pointer to end of buffer (last byte + 1) |
13 | */ |
14 | |
15 | static inline u64 ceph_decode_64(void **p) |
16 | { |
17 | u64 v = get_unaligned_le64(*p); |
18 | *p += sizeof(u64); |
19 | return v; |
20 | } |
21 | static inline u32 ceph_decode_32(void **p) |
22 | { |
23 | u32 v = get_unaligned_le32(*p); |
24 | *p += sizeof(u32); |
25 | return v; |
26 | } |
27 | static inline u16 ceph_decode_16(void **p) |
28 | { |
29 | u16 v = get_unaligned_le16(*p); |
30 | *p += sizeof(u16); |
31 | return v; |
32 | } |
33 | static inline u8 ceph_decode_8(void **p) |
34 | { |
35 | u8 v = *(u8 *)*p; |
36 | (*p)++; |
37 | return v; |
38 | } |
39 | static inline void ceph_decode_copy(void **p, void *pv, size_t n) |
40 | { |
41 | memcpy(pv, *p, n); |
42 | *p += n; |
43 | } |
44 | |
45 | /* |
46 | * bounds check input. |
47 | */ |
48 | #define ceph_decode_need(p, end, n, bad) \ |
49 | do { \ |
50 | if (unlikely(*(p) + (n) > (end))) \ |
51 | goto bad; \ |
52 | } while (0) |
53 | |
54 | #define ceph_decode_64_safe(p, end, v, bad) \ |
55 | do { \ |
56 | ceph_decode_need(p, end, sizeof(u64), bad); \ |
57 | v = ceph_decode_64(p); \ |
58 | } while (0) |
59 | #define ceph_decode_32_safe(p, end, v, bad) \ |
60 | do { \ |
61 | ceph_decode_need(p, end, sizeof(u32), bad); \ |
62 | v = ceph_decode_32(p); \ |
63 | } while (0) |
64 | #define ceph_decode_16_safe(p, end, v, bad) \ |
65 | do { \ |
66 | ceph_decode_need(p, end, sizeof(u16), bad); \ |
67 | v = ceph_decode_16(p); \ |
68 | } while (0) |
69 | #define ceph_decode_8_safe(p, end, v, bad) \ |
70 | do { \ |
71 | ceph_decode_need(p, end, sizeof(u8), bad); \ |
72 | v = ceph_decode_8(p); \ |
73 | } while (0) |
74 | |
75 | #define ceph_decode_copy_safe(p, end, pv, n, bad) \ |
76 | do { \ |
77 | ceph_decode_need(p, end, n, bad); \ |
78 | ceph_decode_copy(p, pv, n); \ |
79 | } while (0) |
80 | |
81 | /* |
82 | * struct ceph_timespec <-> struct timespec |
83 | */ |
84 | static inline void ceph_decode_timespec(struct timespec *ts, |
85 | const struct ceph_timespec *tv) |
86 | { |
87 | ts->tv_sec = le32_to_cpu(tv->tv_sec); |
88 | ts->tv_nsec = le32_to_cpu(tv->tv_nsec); |
89 | } |
90 | static inline void ceph_encode_timespec(struct ceph_timespec *tv, |
91 | const struct timespec *ts) |
92 | { |
93 | tv->tv_sec = cpu_to_le32(ts->tv_sec); |
94 | tv->tv_nsec = cpu_to_le32(ts->tv_nsec); |
95 | } |
96 | |
97 | /* |
98 | * sockaddr_storage <-> ceph_sockaddr |
99 | */ |
100 | static inline void ceph_encode_addr(struct ceph_entity_addr *a) |
101 | { |
102 | a->in_addr.ss_family = htons(a->in_addr.ss_family); |
103 | } |
104 | static inline void ceph_decode_addr(struct ceph_entity_addr *a) |
105 | { |
106 | a->in_addr.ss_family = ntohs(a->in_addr.ss_family); |
107 | WARN_ON(a->in_addr.ss_family == 512); |
108 | } |
109 | |
110 | /* |
111 | * encoders |
112 | */ |
113 | static inline void ceph_encode_64(void **p, u64 v) |
114 | { |
115 | put_unaligned_le64(v, (__le64 *)*p); |
116 | *p += sizeof(u64); |
117 | } |
118 | static inline void ceph_encode_32(void **p, u32 v) |
119 | { |
120 | put_unaligned_le32(v, (__le32 *)*p); |
121 | *p += sizeof(u32); |
122 | } |
123 | static inline void ceph_encode_16(void **p, u16 v) |
124 | { |
125 | put_unaligned_le16(v, (__le16 *)*p); |
126 | *p += sizeof(u16); |
127 | } |
128 | static inline void ceph_encode_8(void **p, u8 v) |
129 | { |
130 | *(u8 *)*p = v; |
131 | (*p)++; |
132 | } |
133 | static inline void ceph_encode_copy(void **p, const void *s, int len) |
134 | { |
135 | memcpy(*p, s, len); |
136 | *p += len; |
137 | } |
138 | |
139 | /* |
140 | * filepath, string encoders |
141 | */ |
142 | static inline void ceph_encode_filepath(void **p, void *end, |
143 | u64 ino, const char *path) |
144 | { |
145 | u32 len = path ? strlen(path) : 0; |
146 | BUG_ON(*p + sizeof(ino) + sizeof(len) + len > end); |
147 | ceph_encode_8(p, 1); |
148 | ceph_encode_64(p, ino); |
149 | ceph_encode_32(p, len); |
150 | if (len) |
151 | memcpy(*p, path, len); |
152 | *p += len; |
153 | } |
154 | |
155 | static inline void ceph_encode_string(void **p, void *end, |
156 | const char *s, u32 len) |
157 | { |
158 | BUG_ON(*p + sizeof(len) + len > end); |
159 | ceph_encode_32(p, len); |
160 | if (len) |
161 | memcpy(*p, s, len); |
162 | *p += len; |
163 | } |
164 | |
165 | #define ceph_encode_need(p, end, n, bad) \ |
166 | do { \ |
167 | if (unlikely(*(p) + (n) > (end))) \ |
168 | goto bad; \ |
169 | } while (0) |
170 | |
171 | #define ceph_encode_64_safe(p, end, v, bad) \ |
172 | do { \ |
173 | ceph_encode_need(p, end, sizeof(u64), bad); \ |
174 | ceph_encode_64(p, v); \ |
175 | } while (0) |
176 | #define ceph_encode_32_safe(p, end, v, bad) \ |
177 | do { \ |
178 | ceph_encode_need(p, end, sizeof(u32), bad); \ |
179 | ceph_encode_32(p, v); \ |
180 | } while (0) |
181 | #define ceph_encode_16_safe(p, end, v, bad) \ |
182 | do { \ |
183 | ceph_encode_need(p, end, sizeof(u16), bad); \ |
184 | ceph_encode_16(p, v); \ |
185 | } while (0) |
186 | |
187 | #define ceph_encode_copy_safe(p, end, pv, n, bad) \ |
188 | do { \ |
189 | ceph_encode_need(p, end, n, bad); \ |
190 | ceph_encode_copy(p, pv, n); \ |
191 | } while (0) |
192 | |
193 | |
194 | #endif |
195 |
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