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1 | /* Stream/packet buffer API |
2 | * Copyright (c) 2014-2015 Timo Teräs | |
3 | * | |
4 | * This file is free software: you may copy, redistribute and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation, either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | */ | |
9 | ||
10 | #ifndef ZBUF_H | |
11 | #define ZBUF_H | |
12 | ||
13 | #include <stdint.h> | |
14 | #include <string.h> | |
15 | #include <endian.h> | |
16 | #include <sys/types.h> | |
17 | ||
18 | #include "zassert.h" | |
19 | #include "list.h" | |
20 | ||
21 | struct zbuf { | |
22 | struct list_head queue_list; | |
23 | unsigned allocated : 1; | |
24 | unsigned error : 1; | |
25 | uint8_t *buf, *end; | |
26 | uint8_t *head, *tail; | |
27 | }; | |
28 | ||
29 | struct zbuf_queue { | |
30 | struct list_head queue_head; | |
31 | }; | |
32 | ||
33 | struct zbuf *zbuf_alloc(size_t size); | |
34 | void zbuf_init(struct zbuf *zb, void *buf, size_t len, size_t datalen); | |
35 | void zbuf_free(struct zbuf *zb); | |
36 | ||
37 | static inline size_t zbuf_size(struct zbuf *zb) | |
38 | { | |
39 | return zb->end - zb->buf; | |
40 | } | |
41 | ||
42 | static inline size_t zbuf_used(struct zbuf *zb) | |
43 | { | |
44 | return zb->tail - zb->head; | |
45 | } | |
46 | ||
47 | static inline size_t zbuf_tailroom(struct zbuf *zb) | |
48 | { | |
49 | return zb->end - zb->tail; | |
50 | } | |
51 | ||
52 | static inline size_t zbuf_headroom(struct zbuf *zb) | |
53 | { | |
54 | return zb->head - zb->buf; | |
55 | } | |
56 | ||
57 | void zbuf_reset(struct zbuf *zb); | |
58 | void zbuf_reset_head(struct zbuf *zb, void *ptr); | |
59 | ssize_t zbuf_read(struct zbuf *zb, int fd, size_t maxlen); | |
60 | ssize_t zbuf_write(struct zbuf *zb, int fd); | |
61 | ssize_t zbuf_recv(struct zbuf *zb, int fd); | |
62 | ssize_t zbuf_send(struct zbuf *zb, int fd); | |
63 | ||
64 | static inline void zbuf_set_rerror(struct zbuf *zb) | |
65 | { | |
66 | zb->error = 1; | |
67 | zb->head = zb->tail; | |
68 | } | |
69 | ||
70 | static inline void zbuf_set_werror(struct zbuf *zb) | |
71 | { | |
72 | zb->error = 1; | |
73 | zb->tail = zb->end; | |
74 | } | |
75 | ||
76 | static inline void *__zbuf_pull(struct zbuf *zb, size_t size, int error) | |
77 | { | |
78 | void *head = zb->head; | |
79 | if (size > zbuf_used(zb)) { | |
80 | if (error) zbuf_set_rerror(zb); | |
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)) | |
88 | #define zbuf_pulln(zb, sz) ((void *)__zbuf_pull(zb, sz, 1)) | |
89 | #define zbuf_may_pull(zb, type) ((type *)__zbuf_pull(zb, sizeof(type), 0)) | |
90 | #define zbuf_may_pulln(zb, sz) ((void *)__zbuf_pull(zb, sz, 0)) | |
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); | |
97 | if (src) memcpy(dst, src, len); | |
98 | } | |
99 | ||
100 | static inline uint8_t zbuf_get8(struct zbuf *zb) | |
101 | { | |
102 | uint8_t *src = zbuf_pull(zb, uint8_t); | |
103 | if (src) return *src; | |
104 | return 0; | |
105 | } | |
106 | ||
107 | static inline uint32_t zbuf_get32(struct zbuf *zb) | |
108 | { | |
109 | struct unaligned32 { | |
110 | uint32_t value; | |
111 | } __attribute__((packed)); | |
112 | ||
113 | struct unaligned32 *v = zbuf_pull(zb, struct unaligned32); | |
114 | if (v) return v->value; | |
115 | return 0; | |
116 | } | |
117 | ||
118 | static inline uint16_t zbuf_get_be16(struct zbuf *zb) | |
119 | { | |
120 | struct unaligned16 { | |
121 | uint16_t value; | |
122 | } __attribute__((packed)); | |
123 | ||
124 | struct unaligned16 *v = zbuf_pull(zb, struct unaligned16); | |
125 | if (v) return be16toh(v->value); | |
126 | return 0; | |
127 | } | |
128 | ||
129 | static inline uint32_t zbuf_get_be32(struct zbuf *zb) | |
130 | { | |
131 | return be32toh(zbuf_get32(zb)); | |
132 | } | |
133 | ||
134 | static inline void *__zbuf_push(struct zbuf *zb, size_t size, int error) | |
135 | { | |
136 | void *tail = zb->tail; | |
137 | if (size > zbuf_tailroom(zb)) { | |
138 | if (error) zbuf_set_werror(zb); | |
139 | return NULL; | |
140 | } | |
141 | zb->tail += size; | |
142 | return tail; | |
143 | } | |
144 | ||
145 | #define zbuf_push(zb, type) ((type *)__zbuf_push(zb, sizeof(type), 1)) | |
146 | #define zbuf_pushn(zb, sz) ((void *)__zbuf_push(zb, sz, 1)) | |
147 | #define zbuf_may_push(zb, type) ((type *)__zbuf_may_push(zb, sizeof(type), 0)) | |
148 | #define zbuf_may_pushn(zb, sz) ((void *)__zbuf_push(zb, sz, 0)) | |
149 | ||
150 | static inline void zbuf_put(struct zbuf *zb, const void *src, size_t len) | |
151 | { | |
152 | void *dst = zbuf_pushn(zb, len); | |
153 | if (dst) memcpy(dst, src, len); | |
154 | } | |
155 | ||
156 | static inline void zbuf_put8(struct zbuf *zb, uint8_t val) | |
157 | { | |
158 | uint8_t *dst = zbuf_push(zb, uint8_t); | |
159 | if (dst) *dst = val; | |
160 | } | |
161 | ||
162 | static inline void zbuf_put_be16(struct zbuf *zb, uint16_t val) | |
163 | { | |
164 | struct unaligned16 { | |
165 | uint16_t value; | |
166 | } __attribute__((packed)); | |
167 | ||
168 | struct unaligned16 *v = zbuf_push(zb, struct unaligned16); | |
169 | if (v) v->value = htobe16(val); | |
170 | } | |
171 | ||
172 | static inline void zbuf_put_be32(struct zbuf *zb, uint32_t val) | |
173 | { | |
174 | struct unaligned32 { | |
175 | uint32_t value; | |
176 | } __attribute__((packed)); | |
177 | ||
178 | struct unaligned32 *v = zbuf_push(zb, struct unaligned32); | |
179 | if (v) v->value = htobe32(val); | |
180 | } | |
181 | ||
182 | void zbuf_copy(struct zbuf *zb, struct zbuf *src, size_t len); | |
183 | ||
184 | void zbufq_init(struct zbuf_queue *); | |
185 | void zbufq_reset(struct zbuf_queue *); | |
186 | void zbufq_queue(struct zbuf_queue *, struct zbuf *); | |
187 | int zbufq_write(struct zbuf_queue *, int); | |
188 | ||
189 | #endif |