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 /*
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13 * the single part format:
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14 *
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15 * "HTTP/1.0 206 Partial Content" CRLF
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16 * ... header ...
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17 * "Content-Type: image/jpeg" CRLF
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18 * "Content-Length: SIZE" CRLF
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19 * "Content-Range: bytes START-END/SIZE" CRLF
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20 * CRLF
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21 * ... data ...
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22 *
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23 *
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24 * the mutlipart format:
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25 *
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26 * "HTTP/1.0 206 Partial Content" CRLF
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27 * ... header ...
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28 * "Content-Type: multipart/byteranges; boundary=0123456789" CRLF
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29 * CRLF
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30 * CRLF
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31 * "--0123456789" CRLF
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32 * "Content-Type: image/jpeg" CRLF
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33 * "Content-Range: bytes START0-END0/SIZE" CRLF
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34 * CRLF
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35 * ... data ...
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36 * CRLF
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37 * "--0123456789" CRLF
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38 * "Content-Type: image/jpeg" CRLF
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39 * "Content-Range: bytes START1-END1/SIZE" CRLF
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40 * CRLF
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41 * ... data ...
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42 * CRLF
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43 * "--0123456789--" CRLF
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44 */
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45
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46
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47 typedef struct {
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48 ngx_str_t boundary_header;
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49 } ngx_http_range_filter_ctx_t;
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50
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51
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52 static ngx_int_t ngx_http_range_header_filter_init(ngx_cycle_t *cycle);
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53 static ngx_int_t ngx_http_range_body_filter_init(ngx_cycle_t *cycle);
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54
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55
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56 static ngx_http_module_t ngx_http_range_header_filter_module_ctx = {
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58
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57 NULL, /* preconfiguration */
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58 NULL, /* postconfiguration */
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50
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59
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60 NULL, /* create main configuration */
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61 NULL, /* init main configuration */
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62
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63 NULL, /* create server configuration */
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64 NULL, /* merge server configuration */
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65
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66 NULL, /* create location configuration */
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67 NULL, /* merge location configuration */
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68 };
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69
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70
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71 ngx_module_t ngx_http_range_header_filter_module = {
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72 NGX_MODULE_V1,
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73 &ngx_http_range_header_filter_module_ctx, /* module context */
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74 NULL, /* module directives */
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75 NGX_HTTP_MODULE, /* module type */
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76 ngx_http_range_header_filter_init, /* init module */
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77 NULL /* init process */
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78 };
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79
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80
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81 static ngx_http_module_t ngx_http_range_body_filter_module_ctx = {
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82 NULL, /* preconfiguration */
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83 NULL, /* postconfiguration */
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84
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85 NULL, /* create main configuration */
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86 NULL, /* init main configuration */
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87
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88 NULL, /* create server configuration */
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89 NULL, /* merge server configuration */
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90
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91 NULL, /* create location configuration */
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92 NULL, /* merge location configuration */
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93 };
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94
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95
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96 ngx_module_t ngx_http_range_body_filter_module = {
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97 NGX_MODULE_V1,
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98 &ngx_http_range_body_filter_module_ctx, /* module context */
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99 NULL, /* module directives */
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100 NGX_HTTP_MODULE, /* module type */
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101 ngx_http_range_body_filter_init, /* init module */
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102 NULL /* init process */
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103 };
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104
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105
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106 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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107 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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108
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109
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110 static ngx_int_t
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111 ngx_http_range_header_filter(ngx_http_request_t *r)
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112 {
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113 u_char *p;
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114 size_t len;
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115 off_t start, end;
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116 ngx_int_t rc;
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117 ngx_uint_t suffix, i;
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118 ngx_atomic_uint_t boundary;
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119 ngx_table_elt_t *content_range;
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120 ngx_http_range_t *range;
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121 ngx_http_range_filter_ctx_t *ctx;
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122
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123 if (r->http_version < NGX_HTTP_VERSION_10
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124 || r->headers_out.status != NGX_HTTP_OK
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125 || r->main
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126 || r->headers_out.content_length_n == -1
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127 || !r->filter_allow_ranges)
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128 {
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129 return ngx_http_next_header_filter(r);
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130 }
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131
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132 if (r->headers_in.range == NULL
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133 || r->headers_in.range->value.len < 7
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134 || ngx_strncasecmp(r->headers_in.range->value.data, "bytes=", 6) != 0)
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135 {
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136
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137 r->headers_out.accept_ranges = ngx_list_push(&r->headers_out.headers);
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138 if (r->headers_out.accept_ranges == NULL) {
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139 return NGX_ERROR;
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140 }
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141
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58
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142 r->headers_out.accept_ranges->hash = 1;
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143 r->headers_out.accept_ranges->key.len = sizeof("Accept-Ranges") - 1;
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144 r->headers_out.accept_ranges->key.data = (u_char *) "Accept-Ranges";
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145 r->headers_out.accept_ranges->value.len = sizeof("bytes") - 1;
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146 r->headers_out.accept_ranges->value.data = (u_char *) "bytes";
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147
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148 return ngx_http_next_header_filter(r);
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149 }
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150
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151 if (ngx_array_init(&r->headers_out.ranges, r->pool, 2,
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152 sizeof(ngx_http_range_t)) == NGX_ERROR)
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153 {
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154 return NGX_ERROR;
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155 }
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156
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157 rc = 0;
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158 range = NULL;
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159 p = r->headers_in.range->value.data + 6;
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160
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161 for ( ;; ) {
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162 start = 0;
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163 end = 0;
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164 suffix = 0;
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165
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166 while (*p == ' ') { p++; }
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167
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168 if (*p != '-') {
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169 if (*p < '0' || *p > '9') {
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170 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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171 break;
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172 }
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173
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174 while (*p >= '0' && *p <= '9') {
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175 start = start * 10 + *p++ - '0';
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176 }
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177
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178 while (*p == ' ') { p++; }
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179
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180 if (*p++ != '-') {
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181 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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182 break;
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183 }
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184
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185 if (start >= r->headers_out.content_length_n) {
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186 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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187 break;
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188 }
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189
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190 while (*p == ' ') { p++; }
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191
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192 if (*p == ',' || *p == '\0') {
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193 range = ngx_array_push(&r->headers_out.ranges);
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194 if (range == NULL) {
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195 return NGX_ERROR;
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196 }
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197
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198 range->start = start;
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199 range->end = r->headers_out.content_length_n;
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200
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201 if (*p++ != ',') {
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202 break;
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203 }
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204
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205 continue;
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206 }
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207
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208 } else {
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209 suffix = 1;
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210 p++;
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211 }
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212
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213 if (*p < '0' || *p > '9') {
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214 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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215 break;
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216 }
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217
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218 while (*p >= '0' && *p <= '9') {
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219 end = end * 10 + *p++ - '0';
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220 }
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221
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222 while (*p == ' ') { p++; }
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223
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224 if (*p != ',' && *p != '\0') {
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225 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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226 break;
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227 }
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228
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229 if (suffix) {
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230 start = r->headers_out.content_length_n - end;
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231 end = r->headers_out.content_length_n - 1;
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232 }
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233
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234 if (start > end) {
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235 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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236 break;
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237 }
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238
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239 range = ngx_array_push(&r->headers_out.ranges);
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240 if (range == NULL) {
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241 return NGX_ERROR;
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242 }
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243
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244 range->start = start;
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245
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246 if (end >= r->headers_out.content_length_n) {
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247 /*
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248 * Download Accelerator sends the last byte position
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249 * that equals to the file length
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250 */
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251 range->end = r->headers_out.content_length_n;
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252
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253 } else {
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254 range->end = end + 1;
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255 }
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256
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257 if (*p++ != ',') {
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258 break;
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259 }
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260 }
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261
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262 if (rc) {
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263
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264 /* rc == NGX_HTTP_RANGE_NOT_SATISFIABLE */
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265
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266 r->headers_out.status = rc;
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267 r->headers_out.ranges.nelts = 0;
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268
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269 content_range = ngx_list_push(&r->headers_out.headers);
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270 if (content_range == NULL) {
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271 return NGX_ERROR;
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272 }
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273
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274 r->headers_out.content_range = content_range;
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275
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276 content_range->hash = 1;
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277 content_range->key.len = sizeof("Content-Range") - 1;
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278 content_range->key.data = (u_char *) "Content-Range";
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279
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280 content_range->value.data = ngx_palloc(r->pool,
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281 sizeof("bytes */") - 1 + NGX_OFF_T_LEN);
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282 if (content_range->value.data == NULL) {
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283 return NGX_ERROR;
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284 }
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285
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286 content_range->value.len = ngx_sprintf(content_range->value.data,
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287 "bytes */%O",
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288 r->headers_out.content_length_n)
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289 - content_range->value.data;
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290
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291 r->headers_out.content_length_n = -1;
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292 if (r->headers_out.content_length) {
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293 r->headers_out.content_length->key.len = 0;
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294 r->headers_out.content_length = NULL;
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295 }
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296
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297 return rc;
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298 }
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299
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300 r->headers_out.status = NGX_HTTP_PARTIAL_CONTENT;
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301
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302 if (r->headers_out.ranges.nelts == 1) {
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303
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304 content_range = ngx_list_push(&r->headers_out.headers);
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305 if (content_range == NULL) {
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306 return NGX_ERROR;
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307 }
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308
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309 r->headers_out.content_range = content_range;
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310
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311 content_range->hash = 1;
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312 content_range->key.len = sizeof("Content-Range") - 1;
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313 content_range->key.data = (u_char *) "Content-Range";
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314
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315 content_range->value.data =
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316 ngx_palloc(r->pool, sizeof("bytes -/") - 1 + 3 * NGX_OFF_T_LEN);
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317 if (content_range->value.data == NULL) {
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318 return NGX_ERROR;
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319 }
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320
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321 /* "Content-Range: bytes SSSS-EEEE/TTTT" header */
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322
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323 content_range->value.len = ngx_sprintf(content_range->value.data,
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324 "bytes %O-%O/%O",
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325 range->start, range->end - 1,
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326 r->headers_out.content_length_n)
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327 - content_range->value.data;
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328
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329 r->headers_out.content_length_n = range->end - range->start;
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330
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331 return ngx_http_next_header_filter(r);
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332 }
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333
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334
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335 /* TODO: what if no content_type ?? */
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336
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337 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_range_filter_ctx_t));
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338 if (ctx == NULL) {
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339 return NGX_ERROR;
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340 }
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341
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342 ngx_http_set_ctx(r, ctx, ngx_http_range_body_filter_module);
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343
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344
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345 len = sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN
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346 + sizeof(CRLF "Content-Type: ") - 1
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347 + r->headers_out.content_type.len
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348 + sizeof(CRLF "Content-Range: bytes ") - 1;
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349
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350 if (r->headers_out.charset.len) {
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351 len += sizeof("; charset=") - 1 + r->headers_out.charset.len;
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352 }
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353
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354 ctx->boundary_header.data = ngx_palloc(r->pool, len);
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355 if (ctx->boundary_header.data == NULL) {
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356 return NGX_ERROR;
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357 }
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358
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359 boundary = ngx_next_temp_number(0);
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360
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361 /*
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362 * The boundary header of the range:
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363 * CRLF
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364 * "--0123456789" CRLF
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365 * "Content-Type: image/jpeg" CRLF
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366 * "Content-Range: bytes "
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367 */
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368
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369 if (r->headers_out.charset.len) {
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370 ctx->boundary_header.len = ngx_sprintf(ctx->boundary_header.data,
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371 CRLF "--%0muA" CRLF
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372 "Content-Type: %V; charset=%V" CRLF
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373 "Content-Range: bytes ",
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374 boundary,
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375 &r->headers_out.content_type,
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376 &r->headers_out.charset)
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377 - ctx->boundary_header.data;
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378
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379 r->headers_out.charset.len = 0;
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380
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381 } else {
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382 ctx->boundary_header.len = ngx_sprintf(ctx->boundary_header.data,
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383 CRLF "--%0muA" CRLF
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384 "Content-Type: %V" CRLF
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385 "Content-Range: bytes ",
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386 boundary,
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387 &r->headers_out.content_type)
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388 - ctx->boundary_header.data;
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389 }
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390
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58
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391 r->headers_out.content_type.data =
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392 ngx_palloc(r->pool,
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393 sizeof("Content-Type: multipart/byteranges; boundary=") - 1
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394 + NGX_ATOMIC_T_LEN);
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395
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58
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396 if (r->headers_out.content_type.data == NULL) {
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397 return NGX_ERROR;
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398 }
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399
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400 /* "Content-Type: multipart/byteranges; boundary=0123456789" */
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401
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58
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402 r->headers_out.content_type.len =
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403 ngx_sprintf(r->headers_out.content_type.data,
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404 "multipart/byteranges; boundary=%0muA",
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405 boundary)
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58
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406 - r->headers_out.content_type.data;
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407
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408
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409 /* the size of the last boundary CRLF "--0123456789--" CRLF */
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410
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411 len = sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN + sizeof("--" CRLF) - 1;
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412
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413 range = r->headers_out.ranges.elts;
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414 for (i = 0; i < r->headers_out.ranges.nelts; i++) {
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415
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416 /* the size of the range: "SSSS-EEEE/TTTT" CRLF CRLF */
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417
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418 range[i].content_range.data =
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419 ngx_palloc(r->pool, 3 * NGX_OFF_T_LEN + 2 + 4);
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420
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421 if (range[i].content_range.data == NULL) {
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422 return NGX_ERROR;
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423 }
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424
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425 range[i].content_range.len = ngx_sprintf(range[i].content_range.data,
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426 "%O-%O/%O" CRLF CRLF,
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427 range[i].start, range[i].end - 1,
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428 r->headers_out.content_length_n)
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429 - range[i].content_range.data;
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430
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431 len += ctx->boundary_header.len + range[i].content_range.len
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432 + (size_t) (range[i].end - range[i].start);
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433 }
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434
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435 r->headers_out.content_length_n = len;
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436 r->headers_out.content_length = NULL;
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437
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438 return ngx_http_next_header_filter(r);
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439 }
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440
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441
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442 static ngx_int_t
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443 ngx_http_range_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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444 {
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445 ngx_uint_t i;
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446 ngx_buf_t *b;
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447 ngx_chain_t *out, *hcl, *rcl, *dcl, **ll;
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448 ngx_http_range_t *range;
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449 ngx_http_range_filter_ctx_t *ctx;
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450
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451 if (r->headers_out.ranges.nelts == 0) {
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452 return ngx_http_next_body_filter(r, in);
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453 }
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454
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455 /*
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456 * the optimized version for the static files only
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457 * that are passed in the single file buf
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458 */
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459
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460 if (in && in->buf->in_file && in->buf->last_buf) {
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461 range = r->headers_out.ranges.elts;
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462
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463 if (r->headers_out.ranges.nelts == 1) {
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464 in->buf->file_pos = range->start;
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465 in->buf->file_last = range->end;
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466
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467 return ngx_http_next_body_filter(r, in);
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468 }
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469
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470 ctx = ngx_http_get_module_ctx(r, ngx_http_range_body_filter_module);
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471 ll = &out;
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472
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473 for (i = 0; i < r->headers_out.ranges.nelts; i++) {
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474
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475 /*
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476 * The boundary header of the range:
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477 * CRLF
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478 * "--0123456789" CRLF
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479 * "Content-Type: image/jpeg" CRLF
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480 * "Content-Range: bytes "
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481 */
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482
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483 b = ngx_calloc_buf(r->pool);
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484 if (b == NULL) {
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485 return NGX_ERROR;
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486 }
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487
|
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488 b->memory = 1;
|
|
489 b->pos = ctx->boundary_header.data;
|
|
490 b->last = ctx->boundary_header.data + ctx->boundary_header.len;
|
|
491
|
|
492 hcl = ngx_alloc_chain_link(r->pool);
|
|
493 if (hcl == NULL) {
|
|
494 return NGX_ERROR;
|
|
495 }
|
|
496
|
|
497 hcl->buf = b;
|
|
498
|
|
499
|
|
500 /* "SSSS-EEEE/TTTT" CRLF CRLF */
|
|
501
|
|
502 b = ngx_calloc_buf(r->pool);
|
|
503 if (b == NULL) {
|
|
504 return NGX_ERROR;
|
|
505 }
|
|
506
|
|
507 b->temporary = 1;
|
|
508 b->pos = range[i].content_range.data;
|
|
509 b->last = range[i].content_range.data + range[i].content_range.len;
|
|
510
|
|
511 rcl = ngx_alloc_chain_link(r->pool);
|
|
512 if (rcl == NULL) {
|
|
513 return NGX_ERROR;
|
|
514 }
|
|
515
|
|
516 rcl->buf = b;
|
|
517
|
|
518
|
|
519 /* the range data */
|
|
520
|
|
521 b = ngx_calloc_buf(r->pool);
|
|
522 if (b == NULL) {
|
|
523 return NGX_ERROR;
|
|
524 }
|
|
525
|
|
526 b->in_file = 1;
|
|
527 b->file_pos = range[i].start;
|
|
528 b->file_last = range[i].end;
|
|
529 b->file = in->buf->file;
|
|
530
|
|
531 dcl = ngx_alloc_chain_link(r->pool);
|
|
532 if (dcl == NULL) {
|
|
533 return NGX_ERROR;
|
|
534 }
|
|
535
|
|
536 dcl->buf = b;
|
|
537
|
|
538 *ll = hcl;
|
|
539 hcl->next = rcl;
|
|
540 rcl->next = dcl;
|
|
541 ll = &dcl->next;
|
|
542 }
|
|
543
|
|
544 /* the last boundary CRLF "--0123456789--" CRLF */
|
|
545
|
|
546 b = ngx_calloc_buf(r->pool);
|
|
547 if (b == NULL) {
|
|
548 return NGX_ERROR;
|
|
549 }
|
|
550
|
|
551 b->temporary = 1;
|
|
552 b->last_buf = 1;
|
|
553
|
|
554 b->pos = ngx_palloc(r->pool, sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN
|
|
555 + sizeof("--" CRLF) - 1);
|
|
556 if (b->pos == NULL) {
|
|
557 return NGX_ERROR;
|
|
558 }
|
|
559
|
|
560 b->last = ngx_cpymem(b->pos, ctx->boundary_header.data, 4 + 10);
|
|
561 *b->last++ = '-'; *b->last++ = '-';
|
|
562 *b->last++ = CR; *b->last++ = LF;
|
|
563
|
|
564 hcl = ngx_alloc_chain_link(r->pool);
|
|
565 if (hcl == NULL) {
|
|
566 return NGX_ERROR;
|
|
567 }
|
|
568
|
|
569 hcl->buf = b;
|
|
570 hcl->next = NULL;
|
|
571
|
|
572 *ll = hcl;
|
|
573
|
|
574 return ngx_http_next_body_filter(r, out);
|
|
575 }
|
|
576
|
|
577 /* TODO: alert */
|
|
578
|
|
579 return ngx_http_next_body_filter(r, in);
|
|
580 }
|
|
581
|
|
582
|
|
583 static ngx_int_t
|
|
584 ngx_http_range_header_filter_init(ngx_cycle_t *cycle)
|
|
585 {
|
|
586 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
587 ngx_http_top_header_filter = ngx_http_range_header_filter;
|
|
588
|
|
589 return NGX_OK;
|
|
590 }
|
|
591
|
|
592
|
|
593 static ngx_int_t
|
|
594 ngx_http_range_body_filter_init(ngx_cycle_t *cycle)
|
|
595 {
|
|
596 ngx_http_next_body_filter = ngx_http_top_body_filter;
|
|
597 ngx_http_top_body_filter = ngx_http_range_body_filter;
|
|
598
|
|
599 return NGX_OK;
|
|
600 }
|