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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 child */
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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 ngx_http_chunked_header_filter(ngx_http_request_t *r)
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44 {
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45 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED) {
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46 return ngx_http_next_header_filter(r);
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47 }
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48
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49 if (r->headers_out.content_length_n == -1) {
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50 if (r->http_version < NGX_HTTP_VERSION_11) {
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51 r->keepalive = 0;
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52
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53 } else {
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54 r->chunked = 1;
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55 }
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56 }
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57
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58 return ngx_http_next_header_filter(r);
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59 }
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60
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61
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62 static ngx_int_t ngx_http_chunked_body_filter(ngx_http_request_t *r,
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63 ngx_chain_t *in)
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64 {
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65 u_char *chunk;
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66 size_t size, len;
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67 ngx_buf_t *b;
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68 ngx_chain_t out, tail, *cl, *tl, **ll;
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69
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70 if (in == NULL || !r->chunked) {
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71 return ngx_http_next_body_filter(r, in);
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72 }
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73
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74 out.buf = NULL;
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75 ll = &out.next;
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76
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77 size = 0;
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78 cl = in;
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79
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80 for ( ;; ) {
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81 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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82 "http chunk: %d", ngx_buf_size(cl->buf));
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83
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84 size += ngx_buf_size(cl->buf);
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85
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86 ngx_test_null(tl, ngx_alloc_chain_link(r->pool), NGX_ERROR);
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87 tl->buf = cl->buf;
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88 *ll = tl;
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89 ll = &tl->next;
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90
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91 if (cl->next == NULL) {
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92 break;
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93 }
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94
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95 cl = cl->next;
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96 }
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97
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98 if (size) {
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99 ngx_test_null(chunk, ngx_palloc(r->pool, 11), NGX_ERROR);
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100 len = ngx_snprintf((char *) chunk, 11, SIZE_T_X_FMT CRLF, size);
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101
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102 ngx_test_null(b, ngx_calloc_buf(r->pool), NGX_ERROR);
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103 b->temporary = 1;
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104 b->pos = chunk;
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105 b->last = chunk + len;
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106
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107 out.buf = b;
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108 }
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109
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110 if (cl->buf->last_buf) {
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111 ngx_test_null(b, ngx_calloc_buf(r->pool), NGX_ERROR);
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112 b->memory = 1;
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113 b->last_buf = 1;
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114 b->pos = (u_char *) CRLF "0" CRLF CRLF;
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115 b->last = b->pos + 7;
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116
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117 cl->buf->last_buf = 0;
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118
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119 if (size == 0) {
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120 b->pos += 2;
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121 out.buf = b;
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122 out.next = NULL;
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123
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124 return ngx_http_next_body_filter(r, &out);
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125 }
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126
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127 } else {
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128 if (size == 0) {
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129 *ll = NULL;
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130 return ngx_http_next_body_filter(r, out.next);
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131 }
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132
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133 ngx_test_null(b, ngx_calloc_buf(r->pool), NGX_ERROR);
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134 b->memory = 1;
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135 b->pos = (u_char *) CRLF;
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136 b->last = b->pos + 2;
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137 }
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138
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139 tail.buf = b;
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140 tail.next = NULL;
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141 *ll = &tail;
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142
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143 return ngx_http_next_body_filter(r, &out);
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144 }
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145
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146
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147 static ngx_int_t ngx_http_chunked_filter_init(ngx_cycle_t *cycle)
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148 {
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149 ngx_http_next_header_filter = ngx_http_top_header_filter;
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150 ngx_http_top_header_filter = ngx_http_chunked_header_filter;
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151
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152 ngx_http_next_body_filter = ngx_http_top_body_filter;
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153 ngx_http_top_body_filter = ngx_http_chunked_body_filter;
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154
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155 return NGX_OK;
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156 }
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