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acddc0ed | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2fb975da TT |
2 | /* Stream/packet buffer API |
3 | * Copyright (c) 2014-2015 Timo Teräs | |
2fb975da TT |
4 | */ |
5 | ||
6 | #ifndef ZBUF_H | |
7 | #define ZBUF_H | |
8 | ||
9 | #include <stdint.h> | |
10 | #include <string.h> | |
11 | #include <endian.h> | |
12 | #include <sys/types.h> | |
13 | ||
f9aa07b1 DL |
14 | #include "typesafe.h" |
15 | ||
16 | PREDECL_DLIST(zbuf_queue); | |
2fb975da TT |
17 | |
18 | struct zbuf { | |
f9aa07b1 | 19 | struct zbuf_queue_item queue_entry; |
2fb975da TT |
20 | unsigned allocated : 1; |
21 | unsigned error : 1; | |
22 | uint8_t *buf, *end; | |
23 | uint8_t *head, *tail; | |
24 | }; | |
25 | ||
f9aa07b1 DL |
26 | DECLARE_DLIST(zbuf_queue, struct zbuf, queue_entry); |
27 | ||
2fb975da | 28 | struct zbuf_queue { |
f9aa07b1 | 29 | struct zbuf_queue_head queue_head; |
2fb975da TT |
30 | }; |
31 | ||
32 | struct zbuf *zbuf_alloc(size_t size); | |
33 | void zbuf_init(struct zbuf *zb, void *buf, size_t len, size_t datalen); | |
34 | void zbuf_free(struct zbuf *zb); | |
35 | ||
36 | static inline size_t zbuf_size(struct zbuf *zb) | |
37 | { | |
38 | return zb->end - zb->buf; | |
39 | } | |
40 | ||
41 | static inline size_t zbuf_used(struct zbuf *zb) | |
42 | { | |
43 | return zb->tail - zb->head; | |
44 | } | |
45 | ||
46 | static inline size_t zbuf_tailroom(struct zbuf *zb) | |
47 | { | |
48 | return zb->end - zb->tail; | |
49 | } | |
50 | ||
51 | static inline size_t zbuf_headroom(struct zbuf *zb) | |
52 | { | |
53 | return zb->head - zb->buf; | |
54 | } | |
55 | ||
56 | void zbuf_reset(struct zbuf *zb); | |
57 | void zbuf_reset_head(struct zbuf *zb, void *ptr); | |
58 | ssize_t zbuf_read(struct zbuf *zb, int fd, size_t maxlen); | |
59 | ssize_t zbuf_write(struct zbuf *zb, int fd); | |
60 | ssize_t zbuf_recv(struct zbuf *zb, int fd); | |
61 | ssize_t zbuf_send(struct zbuf *zb, int fd); | |
62 | ||
63 | static inline void zbuf_set_rerror(struct zbuf *zb) | |
64 | { | |
65 | zb->error = 1; | |
66 | zb->head = zb->tail; | |
67 | } | |
68 | ||
69 | static inline void zbuf_set_werror(struct zbuf *zb) | |
70 | { | |
71 | zb->error = 1; | |
72 | zb->tail = zb->end; | |
73 | } | |
74 | ||
75 | static inline void *__zbuf_pull(struct zbuf *zb, size_t size, int error) | |
76 | { | |
77 | void *head = zb->head; | |
78 | if (size > zbuf_used(zb)) { | |
996c9314 LB |
79 | if (error) |
80 | zbuf_set_rerror(zb); | |
2fb975da TT |
81 | return NULL; |
82 | } | |
83 | zb->head += size; | |
84 | return head; | |
85 | } | |
86 | ||
87 | #define zbuf_pull(zb, type) ((type *)__zbuf_pull(zb, sizeof(type), 1)) | |
c4efd0f4 | 88 | #define zbuf_pulln(zb, sz) (__zbuf_pull(zb, sz, 1)) |
2fb975da | 89 | #define zbuf_may_pull(zb, type) ((type *)__zbuf_pull(zb, sizeof(type), 0)) |
c4efd0f4 | 90 | #define zbuf_may_pulln(zb, sz) (__zbuf_pull(zb, sz, 0)) |
2fb975da TT |
91 | |
92 | void *zbuf_may_pull_until(struct zbuf *zb, const char *sep, struct zbuf *msg); | |
93 | ||
94 | static inline void zbuf_get(struct zbuf *zb, void *dst, size_t len) | |
95 | { | |
96 | void *src = zbuf_pulln(zb, len); | |
996c9314 LB |
97 | if (src) |
98 | memcpy(dst, src, len); | |
2fb975da TT |
99 | } |
100 | ||
101 | static inline uint8_t zbuf_get8(struct zbuf *zb) | |
102 | { | |
103 | uint8_t *src = zbuf_pull(zb, uint8_t); | |
996c9314 LB |
104 | if (src) |
105 | return *src; | |
2fb975da TT |
106 | return 0; |
107 | } | |
108 | ||
109 | static inline uint32_t zbuf_get32(struct zbuf *zb) | |
110 | { | |
111 | struct unaligned32 { | |
112 | uint32_t value; | |
113 | } __attribute__((packed)); | |
114 | ||
115 | struct unaligned32 *v = zbuf_pull(zb, struct unaligned32); | |
996c9314 LB |
116 | if (v) |
117 | return v->value; | |
2fb975da TT |
118 | return 0; |
119 | } | |
120 | ||
121 | static inline uint16_t zbuf_get_be16(struct zbuf *zb) | |
122 | { | |
123 | struct unaligned16 { | |
124 | uint16_t value; | |
125 | } __attribute__((packed)); | |
126 | ||
127 | struct unaligned16 *v = zbuf_pull(zb, struct unaligned16); | |
996c9314 LB |
128 | if (v) |
129 | return be16toh(v->value); | |
2fb975da TT |
130 | return 0; |
131 | } | |
132 | ||
133 | static inline uint32_t zbuf_get_be32(struct zbuf *zb) | |
134 | { | |
135 | return be32toh(zbuf_get32(zb)); | |
136 | } | |
137 | ||
138 | static inline void *__zbuf_push(struct zbuf *zb, size_t size, int error) | |
139 | { | |
140 | void *tail = zb->tail; | |
141 | if (size > zbuf_tailroom(zb)) { | |
996c9314 LB |
142 | if (error) |
143 | zbuf_set_werror(zb); | |
2fb975da TT |
144 | return NULL; |
145 | } | |
146 | zb->tail += size; | |
147 | return tail; | |
148 | } | |
149 | ||
150 | #define zbuf_push(zb, type) ((type *)__zbuf_push(zb, sizeof(type), 1)) | |
c4efd0f4 | 151 | #define zbuf_pushn(zb, sz) (__zbuf_push(zb, sz, 1)) |
2fb975da | 152 | #define zbuf_may_push(zb, type) ((type *)__zbuf_may_push(zb, sizeof(type), 0)) |
c4efd0f4 | 153 | #define zbuf_may_pushn(zb, sz) (__zbuf_push(zb, sz, 0)) |
2fb975da TT |
154 | |
155 | static inline void zbuf_put(struct zbuf *zb, const void *src, size_t len) | |
156 | { | |
157 | void *dst = zbuf_pushn(zb, len); | |
996c9314 LB |
158 | if (dst) |
159 | memcpy(dst, src, len); | |
2fb975da TT |
160 | } |
161 | ||
162 | static inline void zbuf_put8(struct zbuf *zb, uint8_t val) | |
163 | { | |
164 | uint8_t *dst = zbuf_push(zb, uint8_t); | |
996c9314 LB |
165 | if (dst) |
166 | *dst = val; | |
2fb975da TT |
167 | } |
168 | ||
169 | static inline void zbuf_put_be16(struct zbuf *zb, uint16_t val) | |
170 | { | |
171 | struct unaligned16 { | |
172 | uint16_t value; | |
173 | } __attribute__((packed)); | |
174 | ||
175 | struct unaligned16 *v = zbuf_push(zb, struct unaligned16); | |
996c9314 LB |
176 | if (v) |
177 | v->value = htobe16(val); | |
2fb975da TT |
178 | } |
179 | ||
180 | static inline void zbuf_put_be32(struct zbuf *zb, uint32_t val) | |
181 | { | |
182 | struct unaligned32 { | |
183 | uint32_t value; | |
184 | } __attribute__((packed)); | |
185 | ||
186 | struct unaligned32 *v = zbuf_push(zb, struct unaligned32); | |
996c9314 LB |
187 | if (v) |
188 | v->value = htobe32(val); | |
2fb975da TT |
189 | } |
190 | ||
191 | void zbuf_copy(struct zbuf *zb, struct zbuf *src, size_t len); | |
d5dc926f | 192 | void zbuf_copy_peek(struct zbuf *zdst, struct zbuf *zsrc, size_t len); |
2fb975da TT |
193 | |
194 | void zbufq_init(struct zbuf_queue *); | |
195 | void zbufq_reset(struct zbuf_queue *); | |
196 | void zbufq_queue(struct zbuf_queue *, struct zbuf *); | |
197 | int zbufq_write(struct zbuf_queue *, int); | |
198 | ||
199 | #endif |