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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 u_char *start; /* start of buffer */
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26 u_char *end; /* end of buffer */
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27 ngx_buf_tag_t tag;
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28 ngx_file_t *file;
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29 ngx_buf_t *shadow;
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30
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31
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32 /* the buf's content could be changed */
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33 unsigned temporary:1;
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34
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35 /*
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36 * the buf's content is in a memory cache or in a read only memory
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37 * and must not be changed
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38 */
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39 unsigned memory:1;
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40
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41 /* the buf's content is mmap()ed and must not be changed */
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42 unsigned mmap:1;
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43
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44 unsigned recycled:1;
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45 unsigned in_file:1;
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46 unsigned flush:1;
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47 unsigned last_buf:1;
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48
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49 unsigned last_shadow:1;
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50 unsigned temp_file:1;
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51
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52 unsigned zerocopy_busy:1;
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53
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54 /* STUB */ int num;
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55 };
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56
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57
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58 typedef struct ngx_chain_s ngx_chain_t;
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59
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60 struct ngx_chain_s {
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61 ngx_buf_t *buf;
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62 ngx_chain_t *next;
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63 };
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64
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65
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66 typedef struct {
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67 ngx_int_t num;
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68 size_t size;
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69 } ngx_bufs_t;
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70
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71
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28
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72 typedef ngx_int_t (*ngx_output_chain_filter_pt)(void *ctx, ngx_chain_t *in);
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0
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73
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74 typedef struct {
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75 ngx_buf_t *buf;
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76 ngx_chain_t *in;
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77 ngx_chain_t *free;
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78 ngx_chain_t *busy;
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79
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80 unsigned sendfile;
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81 unsigned need_in_memory;
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82 unsigned need_in_temp;
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83
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84 ngx_pool_t *pool;
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85 ngx_int_t allocated;
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86 ngx_bufs_t bufs;
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87 ngx_buf_tag_t tag;
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88
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89 ngx_output_chain_filter_pt output_filter;
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90 void *filter_ctx;
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91 } ngx_output_chain_ctx_t;
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92
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93
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94 typedef struct {
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95 ngx_chain_t *out;
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96 ngx_chain_t **last;
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97 ngx_connection_t *connection;
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98 ngx_pool_t *pool;
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99 off_t limit;
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100 } ngx_chain_writer_ctx_t;
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101
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102
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103 #define NGX_CHAIN_ERROR (ngx_chain_t *) NGX_ERROR
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104
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105
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106 #define ngx_buf_in_memory(b) (b->temporary || b->memory || b->mmap)
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107 #define ngx_buf_in_memory_only(b) (ngx_buf_in_memory(b) && !b->in_file)
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108 #define ngx_buf_special(b) \
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48
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109 ((b->flush || b->last_buf) && !ngx_buf_in_memory(b) && !b->in_file)
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0
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110
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111 #define ngx_buf_size(b) \
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48
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112 (ngx_buf_in_memory(b) ? (off_t) (b->last - b->pos): \
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113 (b->file_last - b->file_pos))
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0
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114
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115 ngx_buf_t *ngx_create_temp_buf(ngx_pool_t *pool, size_t size);
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116 ngx_chain_t *ngx_create_chain_of_bufs(ngx_pool_t *pool, ngx_bufs_t *bufs);
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117
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118
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119 #define ngx_alloc_buf(pool) ngx_palloc(pool, sizeof(ngx_buf_t))
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120 #define ngx_calloc_buf(pool) ngx_pcalloc(pool, sizeof(ngx_buf_t))
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121
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122 #define ngx_alloc_chain_link(pool) ngx_palloc(pool, sizeof(ngx_chain_t))
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123
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124
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125 ngx_int_t ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in);
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28
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126 ngx_int_t ngx_chain_writer(void *ctx, ngx_chain_t *in);
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0
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127
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128 ngx_int_t ngx_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain,
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48
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129 ngx_chain_t *in);
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0
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130 void ngx_chain_update_chains(ngx_chain_t **free, ngx_chain_t **busy,
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48
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131 ngx_chain_t **out, ngx_buf_tag_t tag);
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0
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132
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133
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134 #endif /* _NGX_BUF_H_INCLUDED_ */
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