50
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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_http.h>
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10
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11
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12 static ngx_int_t ngx_http_chunked_filter_init(ngx_cycle_t *cycle);
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13
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14
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15 static ngx_http_module_t ngx_http_chunked_filter_module_ctx = {
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16 NULL, /* pre conf */
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17
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18 NULL, /* create main configuration */
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19 NULL, /* init main configuration */
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20
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21 NULL, /* create server configuration */
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22 NULL, /* merge server configuration */
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23
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24 NULL, /* create location configuration */
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25 NULL, /* merge location configuration */
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26 };
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27
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28
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29 ngx_module_t ngx_http_chunked_filter_module = {
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30 NGX_MODULE,
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31 &ngx_http_chunked_filter_module_ctx, /* module context */
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32 NULL, /* module directives */
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33 NGX_HTTP_MODULE, /* module type */
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34 ngx_http_chunked_filter_init, /* init module */
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35 NULL /* init process */
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36 };
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37
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38
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39 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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40 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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41
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42
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43 static ngx_int_t
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44 ngx_http_chunked_header_filter(ngx_http_request_t *r)
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45 {
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46 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED) {
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47 return ngx_http_next_header_filter(r);
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48 }
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49
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50 if (r->headers_out.content_length_n == -1) {
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51 if (r->http_version < NGX_HTTP_VERSION_11) {
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52 r->keepalive = 0;
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53
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54 } else {
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55 r->chunked = 1;
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56 }
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57 }
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58
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59 return ngx_http_next_header_filter(r);
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60 }
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61
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62
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63 static ngx_int_t
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64 ngx_http_chunked_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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65 {
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66 u_char *chunk;
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67 off_t size;
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68 ngx_buf_t *b;
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69 ngx_chain_t out, tail, *cl, *tl, **ll;
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70
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71 if (in == NULL || !r->chunked || r->header_only) {
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72 return ngx_http_next_body_filter(r, in);
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73 }
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74
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75 out.buf = NULL;
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76 ll = &out.next;
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77
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78 size = 0;
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79 cl = in;
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80
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81 for ( ;; ) {
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82 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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83 "http chunk: %d", ngx_buf_size(cl->buf));
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84
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85 size += ngx_buf_size(cl->buf);
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86
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87 if (cl->buf->flush || ngx_buf_in_memory(cl->buf) || cl->buf->in_file) {
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88
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89 tl = ngx_alloc_chain_link(r->pool);
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90 if (tl == NULL) {
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91 return NGX_ERROR;
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92 }
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93
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94 tl->buf = cl->buf;
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95 *ll = tl;
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96 ll = &tl->next;
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97 }
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98
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99 if (cl->next == NULL) {
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100 break;
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101 }
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102
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103 cl = cl->next;
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104 }
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105
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106 if (size) {
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107 b = ngx_calloc_buf(r->pool);
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108 if (b == NULL) {
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109 return NGX_ERROR;
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110 }
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111
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112 /* the "0000000000000000" is 64-bit hexadimal string */
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113
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114 chunk = ngx_palloc(r->pool, sizeof("0000000000000000" CRLF) - 1);
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115 if (chunk == NULL) {
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116 return NGX_ERROR;
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117 }
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118
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119 b->temporary = 1;
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120 b->pos = chunk;
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121 b->last = ngx_sprintf(chunk, "%xO" CRLF, size);
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122
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123 out.buf = b;
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124 }
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125
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126 if (cl->buf->last_buf) {
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127 b = ngx_calloc_buf(r->pool);
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128 if (b == NULL) {
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129 return NGX_ERROR;
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130 }
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131
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132 b->memory = 1;
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133 b->last_buf = 1;
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134 b->pos = (u_char *) CRLF "0" CRLF CRLF;
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135 b->last = b->pos + 7;
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136
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137 cl->buf->last_buf = 0;
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138
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139 if (size == 0) {
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140 b->pos += 2;
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141 out.buf = b;
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142 out.next = NULL;
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143
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144 return ngx_http_next_body_filter(r, &out);
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145 }
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146
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147 } else {
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148 if (size == 0) {
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149 *ll = NULL;
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150 return ngx_http_next_body_filter(r, out.next);
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151 }
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152
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153 b = ngx_calloc_buf(r->pool);
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154 if (b == NULL) {
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155 return NGX_ERROR;
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156 }
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157
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158 b->memory = 1;
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159 b->pos = (u_char *) CRLF;
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160 b->last = b->pos + 2;
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161 }
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162
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163 tail.buf = b;
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164 tail.next = NULL;
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165 *ll = &tail;
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166
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167 return ngx_http_next_body_filter(r, &out);
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168 }
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169
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170
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171 static ngx_int_t
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172 ngx_http_chunked_filter_init(ngx_cycle_t *cycle)
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173 {
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174 ngx_http_next_header_filter = ngx_http_top_header_filter;
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175 ngx_http_top_header_filter = ngx_http_chunked_header_filter;
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176
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177 ngx_http_next_body_filter = ngx_http_top_body_filter;
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178 ngx_http_top_body_filter = ngx_http_chunked_body_filter;
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179
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180 return NGX_OK;
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181 }
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