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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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146
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53 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED || r != r->main) {
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50
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54 return ngx_http_next_header_filter(r);
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55 }
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56
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57 if (r->headers_out.content_length_n == -1) {
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58 if (r->http_version < NGX_HTTP_VERSION_11) {
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59 r->keepalive = 0;
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60
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61 } else {
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62 r->chunked = 1;
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63 }
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64 }
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65
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66 return ngx_http_next_header_filter(r);
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67 }
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68
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69
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70 static ngx_int_t
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71 ngx_http_chunked_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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72 {
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73 u_char *chunk;
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74 off_t size;
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75 ngx_buf_t *b;
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76 ngx_chain_t out, tail, *cl, *tl, **ll;
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77
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78 if (in == NULL || !r->chunked || r->header_only) {
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79 return ngx_http_next_body_filter(r, in);
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80 }
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81
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82 out.buf = NULL;
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83 ll = &out.next;
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84
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85 size = 0;
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86 cl = in;
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87
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88 for ( ;; ) {
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89 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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90 "http chunk: %d", ngx_buf_size(cl->buf));
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91
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92 size += ngx_buf_size(cl->buf);
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93
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94 if (cl->buf->flush || ngx_buf_in_memory(cl->buf) || cl->buf->in_file) {
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95
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96 tl = ngx_alloc_chain_link(r->pool);
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97 if (tl == NULL) {
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98 return NGX_ERROR;
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99 }
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100
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101 tl->buf = cl->buf;
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102 *ll = tl;
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103 ll = &tl->next;
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104 }
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105
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106 if (cl->next == NULL) {
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107 break;
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108 }
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109
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110 cl = cl->next;
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111 }
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112
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113 if (size) {
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114 b = ngx_calloc_buf(r->pool);
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115 if (b == NULL) {
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116 return NGX_ERROR;
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117 }
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118
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119 /* the "0000000000000000" is 64-bit hexadimal string */
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120
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121 chunk = ngx_palloc(r->pool, sizeof("0000000000000000" CRLF) - 1);
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122 if (chunk == NULL) {
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123 return NGX_ERROR;
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124 }
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125
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126 b->temporary = 1;
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127 b->pos = chunk;
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128 b->last = ngx_sprintf(chunk, "%xO" CRLF, size);
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129
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130 out.buf = b;
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131 }
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132
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133 if (cl->buf->last_buf) {
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134 b = ngx_calloc_buf(r->pool);
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135 if (b == NULL) {
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136 return NGX_ERROR;
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137 }
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138
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139 b->memory = 1;
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140 b->last_buf = 1;
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141 b->pos = (u_char *) CRLF "0" CRLF CRLF;
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142 b->last = b->pos + 7;
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143
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144 cl->buf->last_buf = 0;
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145
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146 if (size == 0) {
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147 b->pos += 2;
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148 out.buf = b;
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149 out.next = NULL;
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150
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151 return ngx_http_next_body_filter(r, &out);
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152 }
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153
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154 } else {
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155 if (size == 0) {
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156 *ll = NULL;
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157 return ngx_http_next_body_filter(r, out.next);
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158 }
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159
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160 b = ngx_calloc_buf(r->pool);
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161 if (b == NULL) {
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162 return NGX_ERROR;
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163 }
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164
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165 b->memory = 1;
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166 b->pos = (u_char *) CRLF;
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167 b->last = b->pos + 2;
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168 }
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169
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170 tail.buf = b;
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171 tail.next = NULL;
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172 *ll = &tail;
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173
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174 return ngx_http_next_body_filter(r, &out);
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175 }
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176
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177
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178 static ngx_int_t
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179 ngx_http_chunked_filter_init(ngx_cycle_t *cycle)
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180 {
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181 ngx_http_next_header_filter = ngx_http_top_header_filter;
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182 ngx_http_top_header_filter = ngx_http_chunked_header_filter;
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183
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184 ngx_http_next_body_filter = ngx_http_top_body_filter;
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185 ngx_http_top_body_filter = ngx_http_chunked_body_filter;
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186
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187 return NGX_OK;
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188 }
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