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2fb975da TT |
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)) { | |
996c9314 LB |
80 | if (error) |
81 | zbuf_set_rerror(zb); | |
2fb975da TT |
82 | return NULL; |
83 | } | |
84 | zb->head += size; | |
85 | return head; | |
86 | } | |
87 | ||
88 | #define zbuf_pull(zb, type) ((type *)__zbuf_pull(zb, sizeof(type), 1)) | |
89 | #define zbuf_pulln(zb, sz) ((void *)__zbuf_pull(zb, sz, 1)) | |
90 | #define zbuf_may_pull(zb, type) ((type *)__zbuf_pull(zb, sizeof(type), 0)) | |
91 | #define zbuf_may_pulln(zb, sz) ((void *)__zbuf_pull(zb, sz, 0)) | |
92 | ||
93 | void *zbuf_may_pull_until(struct zbuf *zb, const char *sep, struct zbuf *msg); | |
94 | ||
95 | static inline void zbuf_get(struct zbuf *zb, void *dst, size_t len) | |
96 | { | |
97 | void *src = zbuf_pulln(zb, len); | |
996c9314 LB |
98 | if (src) |
99 | memcpy(dst, src, len); | |
2fb975da TT |
100 | } |
101 | ||
102 | static inline uint8_t zbuf_get8(struct zbuf *zb) | |
103 | { | |
104 | uint8_t *src = zbuf_pull(zb, uint8_t); | |
996c9314 LB |
105 | if (src) |
106 | return *src; | |
2fb975da TT |
107 | return 0; |
108 | } | |
109 | ||
110 | static inline uint32_t zbuf_get32(struct zbuf *zb) | |
111 | { | |
112 | struct unaligned32 { | |
113 | uint32_t value; | |
114 | } __attribute__((packed)); | |
115 | ||
116 | struct unaligned32 *v = zbuf_pull(zb, struct unaligned32); | |
996c9314 LB |
117 | if (v) |
118 | return v->value; | |
2fb975da TT |
119 | return 0; |
120 | } | |
121 | ||
122 | static inline uint16_t zbuf_get_be16(struct zbuf *zb) | |
123 | { | |
124 | struct unaligned16 { | |
125 | uint16_t value; | |
126 | } __attribute__((packed)); | |
127 | ||
128 | struct unaligned16 *v = zbuf_pull(zb, struct unaligned16); | |
996c9314 LB |
129 | if (v) |
130 | return be16toh(v->value); | |
2fb975da TT |
131 | return 0; |
132 | } | |
133 | ||
134 | static inline uint32_t zbuf_get_be32(struct zbuf *zb) | |
135 | { | |
136 | return be32toh(zbuf_get32(zb)); | |
137 | } | |
138 | ||
139 | static inline void *__zbuf_push(struct zbuf *zb, size_t size, int error) | |
140 | { | |
141 | void *tail = zb->tail; | |
142 | if (size > zbuf_tailroom(zb)) { | |
996c9314 LB |
143 | if (error) |
144 | zbuf_set_werror(zb); | |
2fb975da TT |
145 | return NULL; |
146 | } | |
147 | zb->tail += size; | |
148 | return tail; | |
149 | } | |
150 | ||
151 | #define zbuf_push(zb, type) ((type *)__zbuf_push(zb, sizeof(type), 1)) | |
152 | #define zbuf_pushn(zb, sz) ((void *)__zbuf_push(zb, sz, 1)) | |
153 | #define zbuf_may_push(zb, type) ((type *)__zbuf_may_push(zb, sizeof(type), 0)) | |
154 | #define zbuf_may_pushn(zb, sz) ((void *)__zbuf_push(zb, sz, 0)) | |
155 | ||
156 | static inline void zbuf_put(struct zbuf *zb, const void *src, size_t len) | |
157 | { | |
158 | void *dst = zbuf_pushn(zb, len); | |
996c9314 LB |
159 | if (dst) |
160 | memcpy(dst, src, len); | |
2fb975da TT |
161 | } |
162 | ||
163 | static inline void zbuf_put8(struct zbuf *zb, uint8_t val) | |
164 | { | |
165 | uint8_t *dst = zbuf_push(zb, uint8_t); | |
996c9314 LB |
166 | if (dst) |
167 | *dst = val; | |
2fb975da TT |
168 | } |
169 | ||
170 | static inline void zbuf_put_be16(struct zbuf *zb, uint16_t val) | |
171 | { | |
172 | struct unaligned16 { | |
173 | uint16_t value; | |
174 | } __attribute__((packed)); | |
175 | ||
176 | struct unaligned16 *v = zbuf_push(zb, struct unaligned16); | |
996c9314 LB |
177 | if (v) |
178 | v->value = htobe16(val); | |
2fb975da TT |
179 | } |
180 | ||
181 | static inline void zbuf_put_be32(struct zbuf *zb, uint32_t val) | |
182 | { | |
183 | struct unaligned32 { | |
184 | uint32_t value; | |
185 | } __attribute__((packed)); | |
186 | ||
187 | struct unaligned32 *v = zbuf_push(zb, struct unaligned32); | |
996c9314 LB |
188 | if (v) |
189 | v->value = htobe32(val); | |
2fb975da TT |
190 | } |
191 | ||
192 | void zbuf_copy(struct zbuf *zb, struct zbuf *src, size_t len); | |
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 |