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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #ifndef _NGX_BUF_H_INCLUDED_
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8 #define _NGX_BUF_H_INCLUDED_
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9
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10
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11 #include <ngx_config.h>
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12 #include <ngx_core.h>
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13
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14
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15 typedef void * ngx_buf_tag_t;
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16
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17 typedef struct ngx_buf_s ngx_buf_t;
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18
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19 struct ngx_buf_s {
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20 u_char *pos;
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21 u_char *last;
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22 off_t file_pos;
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23 off_t file_last;
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24
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25 int type;
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26 u_char *start; /* start of buffer */
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27 u_char *end; /* end of buffer */
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28 ngx_buf_tag_t tag;
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29 ngx_file_t *file;
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30 ngx_buf_t *shadow;
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31
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32
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33 /* the buf's content could be changed */
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34 unsigned temporary:1;
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35
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36 /*
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37 * the buf's content is in a memory cache or in a read only memory
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38 * and must not be changed
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39 */
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40 unsigned memory:1;
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41
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42 /* the buf's content is mmap()ed and must not be changed */
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43 unsigned mmap:1;
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44
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45 unsigned recycled:1;
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46 unsigned in_file:1;
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47 unsigned flush:1;
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48 unsigned last_buf:1;
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49
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50 unsigned last_shadow:1;
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51 unsigned temp_file:1;
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52
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53 unsigned zerocopy_busy:1;
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54
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55 /* STUB */ int num;
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56 };
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57
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58
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59 typedef struct ngx_chain_s ngx_chain_t;
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60
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61 struct ngx_chain_s {
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62 ngx_buf_t *buf;
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63 ngx_chain_t *next;
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64 };
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65
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66
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67 typedef struct {
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68 ngx_int_t num;
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69 size_t size;
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70 } ngx_bufs_t;
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71
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72
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73 typedef int (*ngx_output_chain_filter_pt)(void *ctx, ngx_chain_t *out);
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74
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75 typedef struct {
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76 ngx_buf_t *buf;
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77 ngx_chain_t *in;
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78 ngx_chain_t *free;
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79 ngx_chain_t *busy;
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80
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81 unsigned sendfile;
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82 unsigned need_in_memory;
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83 unsigned need_in_temp;
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84
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85 ngx_pool_t *pool;
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86 ngx_int_t allocated;
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87 ngx_bufs_t bufs;
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88 ngx_buf_tag_t tag;
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89
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90 ngx_output_chain_filter_pt output_filter;
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91 void *filter_ctx;
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92 } ngx_output_chain_ctx_t;
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93
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94
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95 typedef struct {
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96 ngx_chain_t *out;
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97 ngx_chain_t **last;
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98 ngx_connection_t *connection;
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99 ngx_pool_t *pool;
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100 off_t limit;
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101 } ngx_chain_writer_ctx_t;
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102
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103
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104 #define NGX_CHAIN_ERROR (ngx_chain_t *) NGX_ERROR
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105
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106
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107 #define ngx_buf_in_memory(b) (b->temporary || b->memory || b->mmap)
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108 #define ngx_buf_in_memory_only(b) (ngx_buf_in_memory(b) && !b->in_file)
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109 #define ngx_buf_special(b) \
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110 ((b->flush || b->last_buf) && !ngx_buf_in_memory(b) && !b->in_file)
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111
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112 #define ngx_buf_size(b) \
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113 (ngx_buf_in_memory(b) ? (size_t) (b->last - b->pos): \
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114 (size_t) (b->file_last - b->file_pos))
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115
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116 ngx_buf_t *ngx_create_temp_buf(ngx_pool_t *pool, size_t size);
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117 ngx_chain_t *ngx_create_chain_of_bufs(ngx_pool_t *pool, ngx_bufs_t *bufs);
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118
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119
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120 #define ngx_alloc_buf(pool) ngx_palloc(pool, sizeof(ngx_buf_t))
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121 #define ngx_calloc_buf(pool) ngx_pcalloc(pool, sizeof(ngx_buf_t))
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122
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123
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124 #define ngx_alloc_chain_link(pool) ngx_palloc(pool, sizeof(ngx_chain_t))
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125
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126
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127 #define ngx_alloc_link_and_set_buf(chain, b, pool, error) \
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128 do { \
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129 ngx_test_null(chain, ngx_alloc_chain_link(pool), error); \
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130 chain->buf = b; \
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131 chain->next = NULL; \
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132 } while (0);
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133
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134
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135 #define ngx_chain_add_link(chain, last, cl) \
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136 if (chain) { \
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137 *last = cl; \
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138 } else { \
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139 chain = cl; \
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140 } \
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141 last = &cl->next
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142
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143
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144 ngx_int_t ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in);
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145 ngx_int_t ngx_chain_writer(void *data, ngx_chain_t *in);
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146
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147 ngx_int_t ngx_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain,
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148 ngx_chain_t *in);
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149 void ngx_chain_update_chains(ngx_chain_t **free, ngx_chain_t **busy,
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150 ngx_chain_t **out, ngx_buf_tag_t tag);
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151
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152
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153 #endif /* _NGX_BUF_H_INCLUDED_ */
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