1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #ifndef _NGX_BUF_H_INCLUDED_
8 #define _NGX_BUF_H_INCLUDED_
9
10
11 #include <ngx_config.h>
12 #include <ngx_core.h>
13
14
15 typedef void * ngx_buf_tag_t;
16
17 typedef struct ngx_buf_s ngx_buf_t;
18
19 struct ngx_buf_s {
20 u_char *pos;
21 u_char *last;
22 off_t file_pos;
23 off_t file_last;
24
25 u_char *start; /* start of buffer */
26 u_char *end; /* end of buffer */
27 ngx_buf_tag_t tag;
28 ngx_file_t *file;
29 ngx_buf_t *shadow;
30
31
32 /* the buf's content could be changed */
33 unsigned temporary:1;
34
35 /*
36 * the buf's content is in a memory cache or in a read only memory
37 * and must not be changed
38 */
39 unsigned memory:1;
40
41 /* the buf's content is mmap()ed and must not be changed */
42 unsigned mmap:1;
43
44 unsigned recycled:1;
45 unsigned in_file:1;
46 unsigned flush:1;
47 unsigned sync:1;
48 unsigned last_buf:1;
49 unsigned last_in_chain:1;
50
51 unsigned last_shadow:1;
52 unsigned temp_file:1;
53
54 unsigned zerocopy_busy:1;
55
56 /* STUB */ int num;
57 };
58
59
60 struct ngx_chain_s {
61 ngx_buf_t *buf;
62 ngx_chain_t *next;
63 };
64
65
66 typedef struct {
67 ngx_int_t num;
68 size_t size;
69 } ngx_bufs_t;
70
71
72 typedef ngx_int_t (*ngx_output_chain_filter_pt)(void *ctx, ngx_chain_t *in);
73
74 typedef struct {
75 ngx_buf_t *buf;
76 ngx_chain_t *in;
77 ngx_chain_t *free;
78 ngx_chain_t *busy;
79
80 unsigned sendfile;
81 unsigned need_in_memory;
82 unsigned need_in_temp;
83
84 ngx_pool_t *pool;
85 ngx_int_t allocated;
86 ngx_bufs_t bufs;
87 ngx_buf_tag_t tag;
88
89 ngx_output_chain_filter_pt output_filter;
90 void *filter_ctx;
91 } ngx_output_chain_ctx_t;
92
93
94 typedef struct {
95 ngx_chain_t *out;
96 ngx_chain_t **last;
97 ngx_connection_t *connection;
98 ngx_pool_t *pool;
99 off_t limit;
100 } ngx_chain_writer_ctx_t;
101
102
103 #define NGX_CHAIN_ERROR (ngx_chain_t *) NGX_ERROR
104
105
106 #define ngx_buf_in_memory(b) (b->temporary || b->memory || b->mmap)
107 #define ngx_buf_in_memory_only(b) (ngx_buf_in_memory(b) && !b->in_file)
108
109 #define ngx_buf_special(b) \
110 ((b->flush || b->last_buf || b->sync) \
111 && !ngx_buf_in_memory(b) && !b->in_file)
112
113 #define ngx_buf_sync_only(b) \
114 (b->sync \
115 && !ngx_buf_in_memory(b) && !b->in_file && !b->flush && !b->last_buf)
116
117 #define ngx_buf_size(b) \
118 (ngx_buf_in_memory(b) ? (off_t) (b->last - b->pos): \
119 (b->file_last - b->file_pos))
120
121 ngx_buf_t *ngx_create_temp_buf(ngx_pool_t *pool, size_t size);
122 ngx_chain_t *ngx_create_chain_of_bufs(ngx_pool_t *pool, ngx_bufs_t *bufs);
123
124
125 #define ngx_alloc_buf(pool) ngx_palloc(pool, sizeof(ngx_buf_t))
126 #define ngx_calloc_buf(pool) ngx_pcalloc(pool, sizeof(ngx_buf_t))
127
128 ngx_chain_t *ngx_alloc_chain_link(ngx_pool_t *pool);
129 #define ngx_free_chain(pool, cl) \
130 cl->next = pool->chain; \
131 pool->chain = cl
132
133
134
135 ngx_int_t ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in);
136 ngx_int_t ngx_chain_writer(void *ctx, ngx_chain_t *in);
137
138 ngx_int_t ngx_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain,
139 ngx_chain_t *in);
140 ngx_chain_t *ngx_chain_get_free_buf(ngx_pool_t *p, ngx_chain_t **free);
141 void ngx_chain_update_chains(ngx_chain_t **free, ngx_chain_t **busy,
142 ngx_chain_t **out, ngx_buf_tag_t tag);
143
144
145 #endif /* _NGX_BUF_H_INCLUDED_ */
146
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