0
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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 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10
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11
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18
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12 #if 0
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13 #define NGX_SENDFILE_LIMIT 4096
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14 #endif
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15
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16
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17 #define NGX_NONE 1
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0
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18
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19
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16
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20 static ngx_inline ngx_int_t
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0
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21 ngx_output_chain_need_to_copy(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf);
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18
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22 static ngx_int_t ngx_output_chain_add_copy(ngx_pool_t *pool,
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48
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23 ngx_chain_t **chain, ngx_chain_t *in);
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0
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24 static ngx_int_t ngx_output_chain_copy_buf(ngx_buf_t *dst, ngx_buf_t *src,
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48
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25 ngx_uint_t sendfile);
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0
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26
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27
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48
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28 ngx_int_t
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29 ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in)
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0
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30 {
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31 int rc, last;
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22
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32 off_t bsize;
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33 size_t size;
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0
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34 ngx_chain_t *cl, *out, **last_out;
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35
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4
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36 if (ctx->in == NULL && ctx->busy == NULL) {
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0
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37
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18
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38 /*
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39 * the short path for the case when the ctx->in and ctx->busy chains
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40 * are empty, the incoming chain is empty too or has the single buf
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41 * that does not require the copy
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42 */
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0
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43
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44 if (in == NULL) {
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45 return ctx->output_filter(ctx->filter_ctx, in);
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46 }
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47
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48 if (in->next == NULL
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18
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49 #if (NGX_SENDFILE_LIMIT)
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50 && !(in->buf->in_file && in->buf->file_last > NGX_SENDFILE_LIMIT)
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51 #endif
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58
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52 && !ngx_output_chain_need_to_copy(ctx, in->buf))
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0
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53 {
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54 return ctx->output_filter(ctx->filter_ctx, in);
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55 }
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56 }
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57
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58 /* add the incoming buf to the chain ctx->in */
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59
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60 if (in) {
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18
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61 if (ngx_output_chain_add_copy(ctx->pool, &ctx->in, in) == NGX_ERROR) {
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0
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62 return NGX_ERROR;
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63 }
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64 }
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65
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66 out = NULL;
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67 last_out = &out;
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48
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68 last = NGX_NONE;
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0
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69
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70 for ( ;; ) {
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71
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72 while (ctx->in) {
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73
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74 /*
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75 * cycle while there are the ctx->in bufs
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76 * or there are the free output bufs to copy in
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77 */
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78
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79 bsize = ngx_buf_size(ctx->in->buf);
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80
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81 if (bsize == 0 && !ngx_buf_special(ctx->in->buf)) {
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82
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83 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0,
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32
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84 "zero size buf in output "
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85 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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86 ctx->in->buf->temporary,
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87 ctx->in->buf->recycled,
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88 ctx->in->buf->in_file,
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89 ctx->in->buf->start,
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90 ctx->in->buf->pos,
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91 ctx->in->buf->last,
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92 ctx->in->buf->file,
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93 ctx->in->buf->file_pos,
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94 ctx->in->buf->file_last);
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0
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95
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22
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96 ngx_debug_point();
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97
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0
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98 ctx->in = ctx->in->next;
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99
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100 continue;
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101 }
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102
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103 if (!ngx_output_chain_need_to_copy(ctx, ctx->in->buf)) {
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104
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105 /* move the chain link to the output chain */
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106
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107 cl = ctx->in;
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108 ctx->in = cl->next;
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109
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110 *last_out = cl;
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111 last_out = &cl->next;
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112 cl->next = NULL;
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113
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114 continue;
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115 }
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116
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117 if (ctx->buf == NULL) {
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118
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119 /* get the free buf */
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120
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121 if (ctx->free) {
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56
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122 cl = ctx->free;
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123 ctx->buf = cl->buf;
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124 ctx->free = cl->next;
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125 ngx_free_chain(ctx->pool, cl);
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0
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126
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127 } else if (out || ctx->allocated == ctx->bufs.num) {
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128
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129 break;
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130
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131 } else {
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132
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133 size = ctx->bufs.size;
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134
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58
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135 if (ctx->in->buf->last_in_chain) {
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0
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136
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22
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137 if (bsize < (off_t) ctx->bufs.size) {
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0
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138
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139 /*
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140 * allocate small temp buf for the small last buf
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141 * or its small last part
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142 */
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143
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22
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144 size = (size_t) bsize;
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0
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145
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146 } else if (ctx->bufs.num == 1
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22
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147 && (bsize < (off_t) (ctx->bufs.size
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148 + (ctx->bufs.size >> 2))))
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0
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149 {
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150 /*
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151 * allocate a temp buf that equals
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152 * to the last buf if the last buf size is lesser
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153 * than 1.25 of bufs.size and a temp buf is single
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154 */
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155
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22
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156 size = (size_t) bsize;
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0
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157 }
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158 }
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159
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50
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160 ctx->buf = ngx_create_temp_buf(ctx->pool, size);
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161 if (ctx->buf == NULL) {
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0
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162 return NGX_ERROR;
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163 }
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164
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165 ctx->buf->tag = ctx->tag;
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166 ctx->buf->recycled = 1;
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167 ctx->allocated++;
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168 }
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169 }
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170
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171 rc = ngx_output_chain_copy_buf(ctx->buf, ctx->in->buf,
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172 ctx->sendfile);
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173
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174 if (rc == NGX_ERROR) {
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175 return rc;
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176 }
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177
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178 if (rc == NGX_AGAIN) {
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179 if (out) {
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180 break;
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181 }
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182
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183 return rc;
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184 }
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185
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186 /* delete the completed buf from the ctx->in chain */
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187
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188 if (ngx_buf_size(ctx->in->buf) == 0) {
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189 ctx->in = ctx->in->next;
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190 }
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191
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50
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192 cl = ngx_alloc_chain_link(ctx->pool);
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193 if (cl == NULL) {
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10
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194 return NGX_ERROR;
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195 }
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50
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196
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10
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197 cl->buf = ctx->buf;
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198 cl->next = NULL;
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0
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199 *last_out = cl;
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200 last_out = &cl->next;
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201 ctx->buf = NULL;
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202 }
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203
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204 if (out == NULL && last != NGX_NONE) {
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58
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205
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206 if (ctx->in) {
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207 return NGX_AGAIN;
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208 }
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209
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0
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210 return last;
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211 }
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212
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213 last = ctx->output_filter(ctx->filter_ctx, out);
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214
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215 ngx_chain_update_chains(&ctx->free, &ctx->busy, &out, ctx->tag);
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216 last_out = &out;
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217
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218 if (last == NGX_ERROR) {
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219 return last;
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220 }
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221 }
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222 }
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223
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224
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16
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225 static ngx_inline ngx_int_t
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48
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226 ngx_output_chain_need_to_copy(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf)
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0
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227 {
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18
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228 ngx_uint_t sendfile;
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229
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0
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230 if (ngx_buf_special(buf)) {
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231 return 0;
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232 }
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233
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18
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234 sendfile = ctx->sendfile;
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235
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236 #if (NGX_SENDFILE_LIMIT)
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237
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238 if (buf->in_file && buf->file_pos >= NGX_SENDFILE_LIMIT) {
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239 sendfile = 0;
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240 }
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241
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242 #endif
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243
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244 if (!sendfile) {
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4
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245
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0
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246 if (!ngx_buf_in_memory(buf)) {
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247 return 1;
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248 }
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249
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250 buf->in_file = 0;
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251 }
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252
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253 if (ctx->need_in_memory && !ngx_buf_in_memory(buf)) {
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254 return 1;
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255 }
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256
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257 if (ctx->need_in_temp && (buf->memory || buf->mmap)) {
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258 return 1;
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259 }
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260
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261 return 0;
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262 }
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263
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264
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48
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265 static ngx_int_t
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266 ngx_output_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain,
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267 ngx_chain_t *in)
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18
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268 {
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269 ngx_chain_t *cl, **ll;
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270 #if (NGX_SENDFILE_LIMIT)
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271 ngx_buf_t *b, *buf;
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272 #endif
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273
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274 ll = chain;
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275
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276 for (cl = *chain; cl; cl = cl->next) {
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277 ll = &cl->next;
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278 }
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279
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280 while (in) {
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281
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50
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282 cl = ngx_alloc_chain_link(pool);
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283 if (cl == NULL) {
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18
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284 return NGX_ERROR;
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285 }
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286
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287 #if (NGX_SENDFILE_LIMIT)
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288
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289 buf = in->buf;
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290
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291 if (buf->in_file
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292 && buf->file_pos < NGX_SENDFILE_LIMIT
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293 && buf->file_last > NGX_SENDFILE_LIMIT)
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294 {
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50
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295 b = ngx_calloc_buf(pool);
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296 if (b == NULL) {
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18
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297 return NGX_ERROR;
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298 }
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299
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300 ngx_memcpy(b, buf, sizeof(ngx_buf_t));
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301
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302 if (ngx_buf_in_memory(buf)) {
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303 buf->pos += (ssize_t) (NGX_SENDFILE_LIMIT - buf->file_pos);
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304 b->last = buf->pos;
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305 }
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306
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307 buf->file_pos = NGX_SENDFILE_LIMIT;
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308 b->file_last = NGX_SENDFILE_LIMIT;
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309
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310 cl->buf = b;
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311
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312 } else {
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313 cl->buf = buf;
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314 in = in->next;
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315 }
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316
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317 #else
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318 cl->buf = in->buf;
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319 in = in->next;
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320
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321 #endif
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322
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323 *ll = cl;
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324 ll = &cl->next;
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325 }
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326
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327 *ll = NULL;
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328
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329 return NGX_OK;
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330 }
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331
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332
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48
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333 static ngx_int_t
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334 ngx_output_chain_copy_buf(ngx_buf_t *dst, ngx_buf_t *src, ngx_uint_t sendfile)
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0
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335 {
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22
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336 off_t size;
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0
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337 ssize_t n;
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338
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339 size = ngx_buf_size(src);
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340
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22
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341 if (size > dst->end - dst->pos) {
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0
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342 size = dst->end - dst->pos;
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343 }
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344
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18
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345 #if (NGX_SENDFILE_LIMIT)
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346
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347 if (src->in_file && src->file_pos >= NGX_SENDFILE_LIMIT) {
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348 sendfile = 0;
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349 }
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350
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351 #endif
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352
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0
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353 if (ngx_buf_in_memory(src)) {
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22
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354 ngx_memcpy(dst->pos, src->pos, (size_t) size);
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355 src->pos += (size_t) size;
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356 dst->last += (size_t) size;
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0
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357
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4
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358 if (src->in_file) {
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359
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360 if (sendfile) {
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361 dst->in_file = 1;
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362 dst->file = src->file;
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363 dst->file_pos = src->file_pos;
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364 dst->file_last = src->file_pos + size;
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365
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366 } else {
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367 dst->in_file = 0;
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368 }
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369
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0
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370 src->file_pos += size;
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2
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371
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372 } else {
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373 dst->in_file = 0;
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0
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374 }
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375
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376 if (src->last_buf && src->pos == src->last) {
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377 dst->last_buf = 1;
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378 }
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379
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380 } else {
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22
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381 n = ngx_read_file(src->file, dst->pos, (size_t) size, src->file_pos);
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0
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382
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383 if (n == NGX_ERROR) {
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384 return n;
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385 }
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386
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387 #if (NGX_FILE_AIO_READ)
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388 if (n == NGX_AGAIN) {
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389 return n;
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390 }
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391 #endif
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392
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22
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393 if (n != size) {
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0
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394 ngx_log_error(NGX_LOG_ALERT, src->file->log, 0,
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22
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395 ngx_read_file_n " reads only %z of %O from file",
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0
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396 n, size);
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397 if (n == 0) {
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398 return NGX_ERROR;
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399 }
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400 }
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401
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402 dst->last += n;
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403
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2
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404 if (sendfile) {
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405 dst->in_file = 1;
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406 dst->file = src->file;
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407 dst->file_pos = src->file_pos;
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4
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408 dst->file_last = src->file_pos + n;
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2
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409
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410 } else {
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0
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411 dst->in_file = 0;
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412 }
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413
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4
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414 src->file_pos += n;
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415
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0
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416 if (src->last_buf && src->file_pos == src->file_last) {
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417 dst->last_buf = 1;
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418 }
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419 }
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420
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421 return NGX_OK;
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422 }
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423
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424
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48
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425 ngx_int_t
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426 ngx_chain_writer(void *data, ngx_chain_t *in)
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0
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427 {
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428 ngx_chain_writer_ctx_t *ctx = data;
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429
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22
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430 off_t size;
|
0
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431 ngx_chain_t *cl;
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432
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22
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433 for (size = 0; in; in = in->next) {
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434
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435 #if 1
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436 if (ngx_buf_size(in->buf) == 0 && !ngx_buf_special(in->buf)) {
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437 ngx_debug_point();
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438 }
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439 #endif
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440
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441 size += ngx_buf_size(in->buf);
|
0
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442
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443 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0,
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10
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444 "chain writer buf size: %uz", ngx_buf_size(in->buf));
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0
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445
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50
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446 cl = ngx_alloc_chain_link(ctx->pool);
|
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447 if (cl == NULL) {
|
10
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448 return NGX_ERROR;
|
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449 }
|
50
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450
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10
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451 cl->buf = in->buf;
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452 cl->next = NULL;
|
0
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453 *ctx->last = cl;
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454 ctx->last = &cl->next;
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455 }
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456
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457 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0,
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10
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458 "chain writer in: %p", ctx->out);
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0
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459
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22
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460 for (cl = ctx->out; cl; cl = cl->next) {
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461
|
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462 #if 1
|
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463 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
|
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464 ngx_debug_point();
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465 }
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466
|
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467 #endif
|
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468
|
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469 size += ngx_buf_size(cl->buf);
|
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470 }
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471
|
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472 if (size == 0) {
|
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473 return NGX_OK;
|
|
474 }
|
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475
|
0
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476 ctx->out = ngx_send_chain(ctx->connection, ctx->out, ctx->limit);
|
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477
|
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478 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0,
|
10
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479 "chain writer out: %p", ctx->out);
|
0
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480
|
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481 if (ctx->out == NGX_CHAIN_ERROR) {
|
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482 return NGX_ERROR;
|
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483 }
|
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484
|
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485 if (ctx->out == NULL) {
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486 ctx->last = &ctx->out;
|
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487 return NGX_OK;
|
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488 }
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489
|
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490 return NGX_AGAIN;
|
|
491 }
|