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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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58
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16 NULL, /* preconfiguration */
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17 NULL, /* postconfiguration */
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18
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19 NULL, /* create main configuration */
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20 NULL, /* init main configuration */
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21
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22 NULL, /* create server configuration */
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23 NULL, /* merge server configuration */
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24
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25 NULL, /* create location configuration */
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26 NULL, /* merge location configuration */
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27 };
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28
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29
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30 ngx_module_t ngx_http_chunked_filter_module = {
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58
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31 NGX_MODULE_V1,
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32 &ngx_http_chunked_filter_module_ctx, /* module context */
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33 NULL, /* module directives */
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34 NGX_HTTP_MODULE, /* module type */
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90
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35 NULL, /* init master */
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36 ngx_http_chunked_filter_init, /* init module */
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90
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37 NULL, /* init process */
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38 NULL, /* init thread */
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39 NULL, /* exit thread */
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40 NULL, /* exit process */
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41 NULL, /* exit master */
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42 NGX_MODULE_V1_PADDING
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50
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43 };
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44
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45
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46 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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47 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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48
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49
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50 static ngx_int_t
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51 ngx_http_chunked_header_filter(ngx_http_request_t *r)
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52 {
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164
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53 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED
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54 || r->headers_out.status == NGX_HTTP_NO_CONTENT
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55 || r != r->main)
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56 {
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57 return ngx_http_next_header_filter(r);
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58 }
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59
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60 if (r->headers_out.content_length_n == -1) {
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61 if (r->http_version < NGX_HTTP_VERSION_11) {
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62 r->keepalive = 0;
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63
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64 } else {
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65 r->chunked = 1;
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66 }
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67 }
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68
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69 return ngx_http_next_header_filter(r);
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70 }
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71
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72
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73 static ngx_int_t
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74 ngx_http_chunked_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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75 {
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76 u_char *chunk;
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77 off_t size;
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78 ngx_buf_t *b;
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79 ngx_chain_t out, tail, *cl, *tl, **ll;
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80
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81 if (in == NULL || !r->chunked || r->header_only) {
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82 return ngx_http_next_body_filter(r, in);
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83 }
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84
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85 out.buf = NULL;
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86 ll = &out.next;
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87
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88 size = 0;
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89 cl = in;
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90
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91 for ( ;; ) {
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92 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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93 "http chunk: %d", ngx_buf_size(cl->buf));
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94
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95 size += ngx_buf_size(cl->buf);
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96
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97 if (cl->buf->flush || ngx_buf_in_memory(cl->buf) || cl->buf->in_file) {
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98
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99 tl = ngx_alloc_chain_link(r->pool);
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100 if (tl == NULL) {
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101 return NGX_ERROR;
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102 }
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103
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104 tl->buf = cl->buf;
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105 *ll = tl;
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106 ll = &tl->next;
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107 }
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108
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109 if (cl->next == NULL) {
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110 break;
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111 }
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112
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113 cl = cl->next;
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114 }
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115
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116 if (size) {
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117 b = ngx_calloc_buf(r->pool);
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118 if (b == NULL) {
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119 return NGX_ERROR;
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120 }
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121
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122 /* the "0000000000000000" is 64-bit hexadimal string */
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123
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124 chunk = ngx_palloc(r->pool, sizeof("0000000000000000" CRLF) - 1);
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125 if (chunk == NULL) {
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126 return NGX_ERROR;
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127 }
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128
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129 b->temporary = 1;
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130 b->pos = chunk;
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131 b->last = ngx_sprintf(chunk, "%xO" CRLF, size);
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132
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133 out.buf = b;
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134 }
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135
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136 if (cl->buf->last_buf) {
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137 b = ngx_calloc_buf(r->pool);
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138 if (b == NULL) {
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139 return NGX_ERROR;
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140 }
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141
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142 b->memory = 1;
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143 b->last_buf = 1;
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144 b->pos = (u_char *) CRLF "0" CRLF CRLF;
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145 b->last = b->pos + 7;
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146
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147 cl->buf->last_buf = 0;
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148
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149 if (size == 0) {
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150 b->pos += 2;
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151 out.buf = b;
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152 out.next = NULL;
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153
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154 return ngx_http_next_body_filter(r, &out);
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155 }
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156
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157 } else {
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158 if (size == 0) {
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159 *ll = NULL;
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160 return ngx_http_next_body_filter(r, out.next);
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161 }
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162
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163 b = ngx_calloc_buf(r->pool);
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164 if (b == NULL) {
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165 return NGX_ERROR;
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166 }
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167
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168 b->memory = 1;
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169 b->pos = (u_char *) CRLF;
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170 b->last = b->pos + 2;
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171 }
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172
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173 tail.buf = b;
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174 tail.next = NULL;
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175 *ll = &tail;
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176
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177 return ngx_http_next_body_filter(r, &out);
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178 }
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179
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180
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181 static ngx_int_t
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182 ngx_http_chunked_filter_init(ngx_cycle_t *cycle)
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183 {
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184 ngx_http_next_header_filter = ngx_http_top_header_filter;
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185 ngx_http_top_header_filter = ngx_http_chunked_header_filter;
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186
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187 ngx_http_next_body_filter = ngx_http_top_body_filter;
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188 ngx_http_top_body_filter = ngx_http_chunked_body_filter;
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189
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190 return NGX_OK;
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191 }
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