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 #include <zlib.h>
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12
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13
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14 typedef struct {
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15 ngx_flag_t enable;
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16 ngx_flag_t no_buffer;
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17
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18 ngx_array_t *types; /* array of ngx_http_gzip_type_t */
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19
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20 ngx_bufs_t bufs;
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21
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22 ngx_uint_t http_version;
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23 ngx_uint_t proxied;
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24
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25 int level;
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26 size_t wbits;
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27 size_t memlevel;
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28 ssize_t min_length;
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29 } ngx_http_gzip_conf_t;
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30
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31
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32 typedef struct {
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33 ngx_str_t name;
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34 ngx_uint_t enable;
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35 } ngx_http_gzip_type_t;
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36
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37
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38 #define NGX_HTTP_GZIP_PROXIED_OFF 0x0002
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39 #define NGX_HTTP_GZIP_PROXIED_EXPIRED 0x0004
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40 #define NGX_HTTP_GZIP_PROXIED_NO_CACHE 0x0008
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41 #define NGX_HTTP_GZIP_PROXIED_NO_STORE 0x0010
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42 #define NGX_HTTP_GZIP_PROXIED_PRIVATE 0x0020
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43 #define NGX_HTTP_GZIP_PROXIED_NO_LM 0x0040
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44 #define NGX_HTTP_GZIP_PROXIED_NO_ETAG 0x0080
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45 #define NGX_HTTP_GZIP_PROXIED_AUTH 0x0100
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46 #define NGX_HTTP_GZIP_PROXIED_ANY 0x0200
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47
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48
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49 typedef struct {
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50 ngx_chain_t *in;
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51 ngx_chain_t *free;
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52 ngx_chain_t *busy;
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53 ngx_chain_t *out;
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54 ngx_chain_t **last_out;
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55 ngx_buf_t *in_buf;
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56 ngx_buf_t *out_buf;
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57 ngx_int_t bufs;
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58
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59 off_t length;
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60
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61 void *preallocated;
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62 char *free_mem;
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63 ngx_uint_t allocated;
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64
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65 unsigned flush:4;
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66 unsigned redo:1;
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67 unsigned done:1;
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68
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69 size_t zin;
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70 size_t zout;
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71
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72 uint32_t crc32;
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73 z_stream zstream;
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74 ngx_http_request_t *request;
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75 } ngx_http_gzip_ctx_t;
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76
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77
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78 static ngx_int_t ngx_http_gzip_proxied(ngx_http_request_t *r,
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79 ngx_http_gzip_conf_t *conf);
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80 static void *ngx_http_gzip_filter_alloc(void *opaque, u_int items,
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81 u_int size);
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82 static void ngx_http_gzip_filter_free(void *opaque, void *address);
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83 static void ngx_http_gzip_error(ngx_http_gzip_ctx_t *ctx);
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84
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85 static u_char *ngx_http_gzip_log_ratio(ngx_http_request_t *r, u_char *buf,
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86 ngx_http_log_op_t *op);
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87
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88 static ngx_int_t ngx_http_gzip_add_log_formats(ngx_conf_t *cf);
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89
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90 static ngx_int_t ngx_http_gzip_filter_init(ngx_cycle_t *cycle);
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91 static void *ngx_http_gzip_create_conf(ngx_conf_t *cf);
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92 static char *ngx_http_gzip_merge_conf(ngx_conf_t *cf,
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93 void *parent, void *child);
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94 static char *ngx_http_gzip_set_types(ngx_conf_t *cf, ngx_command_t *cmd,
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95 void *conf);
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96 static char *ngx_http_gzip_set_window(ngx_conf_t *cf, void *post, void *data);
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97 static char *ngx_http_gzip_set_hash(ngx_conf_t *cf, void *post, void *data);
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98
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99
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100 static ngx_conf_num_bounds_t ngx_http_gzip_comp_level_bounds = {
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101 ngx_conf_check_num_bounds, 1, 9
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102 };
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103
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104 static ngx_conf_post_handler_pt ngx_http_gzip_set_window_p =
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105 ngx_http_gzip_set_window;
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106 static ngx_conf_post_handler_pt ngx_http_gzip_set_hash_p =
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107 ngx_http_gzip_set_hash;
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108
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109
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110
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111 static ngx_conf_enum_t ngx_http_gzip_http_version[] = {
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112 { ngx_string("1.0"), NGX_HTTP_VERSION_10 },
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113 { ngx_string("1.1"), NGX_HTTP_VERSION_11 },
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114 { ngx_null_string, 0 }
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115 };
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116
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117
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118 static ngx_conf_bitmask_t ngx_http_gzip_proxied_mask[] = {
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119 { ngx_string("off"), NGX_HTTP_GZIP_PROXIED_OFF },
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120 { ngx_string("expired"), NGX_HTTP_GZIP_PROXIED_EXPIRED },
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121 { ngx_string("no-cache"), NGX_HTTP_GZIP_PROXIED_NO_CACHE },
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122 { ngx_string("no-store"), NGX_HTTP_GZIP_PROXIED_NO_STORE },
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123 { ngx_string("private"), NGX_HTTP_GZIP_PROXIED_PRIVATE },
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124 { ngx_string("no_last_modified"), NGX_HTTP_GZIP_PROXIED_NO_LM },
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125 { ngx_string("no_etag"), NGX_HTTP_GZIP_PROXIED_NO_ETAG },
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126 { ngx_string("auth"), NGX_HTTP_GZIP_PROXIED_AUTH },
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127 { ngx_string("any"), NGX_HTTP_GZIP_PROXIED_ANY },
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128 { ngx_null_string, 0 }
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129 };
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130
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131
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132 static ngx_command_t ngx_http_gzip_filter_commands[] = {
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133
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134 { ngx_string("gzip"),
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135 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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136 |NGX_CONF_FLAG,
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137 ngx_conf_set_flag_slot,
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138 NGX_HTTP_LOC_CONF_OFFSET,
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139 offsetof(ngx_http_gzip_conf_t, enable),
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140 NULL },
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141
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142 { ngx_string("gzip_buffers"),
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143 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
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144 ngx_conf_set_bufs_slot,
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145 NGX_HTTP_LOC_CONF_OFFSET,
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146 offsetof(ngx_http_gzip_conf_t, bufs),
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147 NULL },
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148
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149 { ngx_string("gzip_types"),
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150 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
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151 ngx_http_gzip_set_types,
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152 NGX_HTTP_LOC_CONF_OFFSET,
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153 0,
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154 NULL },
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155
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156 { ngx_string("gzip_comp_level"),
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157 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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158 ngx_conf_set_num_slot,
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159 NGX_HTTP_LOC_CONF_OFFSET,
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160 offsetof(ngx_http_gzip_conf_t, level),
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161 &ngx_http_gzip_comp_level_bounds },
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162
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163 { ngx_string("gzip_window"),
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164 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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165 ngx_conf_set_size_slot,
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166 NGX_HTTP_LOC_CONF_OFFSET,
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167 offsetof(ngx_http_gzip_conf_t, wbits),
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168 &ngx_http_gzip_set_window_p },
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169
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170 { ngx_string("gzip_hash"),
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171 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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172 ngx_conf_set_size_slot,
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173 NGX_HTTP_LOC_CONF_OFFSET,
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174 offsetof(ngx_http_gzip_conf_t, memlevel),
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175 &ngx_http_gzip_set_hash_p },
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176
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177 { ngx_string("gzip_no_buffer"),
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178 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
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179 ngx_conf_set_flag_slot,
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180 NGX_HTTP_LOC_CONF_OFFSET,
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181 offsetof(ngx_http_gzip_conf_t, no_buffer),
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182 NULL },
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183
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184 { ngx_string("gzip_http_version"),
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185 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_ANY,
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186 ngx_conf_set_enum_slot,
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187 NGX_HTTP_LOC_CONF_OFFSET,
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188 offsetof(ngx_http_gzip_conf_t, http_version),
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189 &ngx_http_gzip_http_version },
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190
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191 { ngx_string("gzip_proxied"),
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192 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_ANY,
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193 ngx_conf_set_bitmask_slot,
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194 NGX_HTTP_LOC_CONF_OFFSET,
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195 offsetof(ngx_http_gzip_conf_t, proxied),
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196 &ngx_http_gzip_proxied_mask },
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197
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198 { ngx_string("gzip_min_length"),
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199 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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200 ngx_conf_set_size_slot,
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201 NGX_HTTP_LOC_CONF_OFFSET,
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202 offsetof(ngx_http_gzip_conf_t, min_length),
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203 NULL },
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204
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205 ngx_null_command
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206 };
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207
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208
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209 static ngx_http_module_t ngx_http_gzip_filter_module_ctx = {
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210 ngx_http_gzip_add_log_formats, /* pre conf */
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211
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212 NULL, /* create main configuration */
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213 NULL, /* init main configuration */
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214
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215 NULL, /* create server configuration */
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216 NULL, /* merge server configuration */
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217
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218 ngx_http_gzip_create_conf, /* create location configuration */
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219 ngx_http_gzip_merge_conf /* merge location configuration */
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220 };
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221
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222
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223 ngx_module_t ngx_http_gzip_filter_module = {
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224 NGX_MODULE,
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225 &ngx_http_gzip_filter_module_ctx, /* module context */
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226 ngx_http_gzip_filter_commands, /* module directives */
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227 NGX_HTTP_MODULE, /* module type */
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228 ngx_http_gzip_filter_init, /* init module */
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229 NULL /* init process */
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230 };
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231
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232
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233 static ngx_http_log_op_name_t ngx_http_gzip_log_fmt_ops[] = {
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234 { ngx_string("gzip_ratio"), NGX_INT32_LEN + 3,
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235 NULL, NULL, ngx_http_gzip_log_ratio },
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236 { ngx_null_string, 0, NULL, NULL, NULL }
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237 };
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238
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239
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240
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241 static u_char gzheader[10] = { 0x1f, 0x8b, Z_DEFLATED, 0, 0, 0, 0, 0, 0, 3 };
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242
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243 #if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)
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244
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245 struct gztrailer {
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246 uint32_t crc32;
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247 uint32_t zlen;
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248 };
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249
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250 #else /* NGX_HAVE_BIG_ENDIAN || !NGX_HAVE_NONALIGNED */
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251
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252 struct gztrailer {
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253 u_char crc32[4];
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254 u_char zlen[4];
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255 };
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256
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257 #endif
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258
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259
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260 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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261 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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262
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263
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264 static ngx_int_t
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265 ngx_http_gzip_header_filter(ngx_http_request_t *r)
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266 {
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267 ngx_uint_t i, found;
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268 ngx_http_gzip_ctx_t *ctx;
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269 ngx_http_gzip_conf_t *conf;
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270 ngx_http_gzip_type_t *type;
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271
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272 conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module);
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273
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274 if (!conf->enable
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275 || (r->headers_out.status != NGX_HTTP_OK
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276 && r->headers_out.status != NGX_HTTP_FORBIDDEN
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277 && r->headers_out.status != NGX_HTTP_NOT_FOUND)
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278 || r->header_only
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279 || r->http_version < conf->http_version
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280 || r->headers_out.content_type == NULL
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281 || (r->headers_out.content_encoding
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282 && r->headers_out.content_encoding->value.len)
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283 || r->headers_in.accept_encoding == NULL
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284 || (r->headers_out.content_length_n != -1
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285 && r->headers_out.content_length_n < conf->min_length)
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286 || ngx_strstr(r->headers_in.accept_encoding->value.data, "gzip") == NULL
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287 )
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288 {
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289 return ngx_http_next_header_filter(r);
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290 }
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291
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292
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293 found = 0;
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294 type = conf->types->elts;
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295
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296 for (i = 0; i < conf->types->nelts; i++) {
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297 if (r->headers_out.content_type->value.len >= type[i].name.len
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298 && ngx_strncasecmp(r->headers_out.content_type->value.data,
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299 type[i].name.data, type[i].name.len) == 0)
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300 {
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301 found = 1;
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302 break;
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303 }
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304 }
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305
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306 if (!found) {
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307 return ngx_http_next_header_filter(r);
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308 }
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309
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310
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311 if (r->headers_in.via) {
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312 if (conf->proxied & NGX_HTTP_GZIP_PROXIED_OFF) {
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313 return ngx_http_next_header_filter(r);
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314 }
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315
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316 if (!(conf->proxied & NGX_HTTP_GZIP_PROXIED_ANY)
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317 && ngx_http_gzip_proxied(r, conf) == NGX_DECLINED)
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318 {
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319 return ngx_http_next_header_filter(r);
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320 }
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321 }
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322
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323
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324 /*
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325 * if the URL (without the "http://" prefix) is longer than 253 bytes
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326 * then MSIE 4.x can not handle the compressed stream - it waits too long,
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327 * hangs up or crashes
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328 */
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329
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330 if (r->headers_in.msie4 && r->unparsed_uri.len > 200) {
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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 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_gzip_ctx_t));
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335 if (ctx == NULL) {
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336 return NGX_ERROR;
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337 }
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338
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339 ngx_http_set_ctx(r, ctx, ngx_http_gzip_filter_module);
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340
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341
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342 ctx->request = r;
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343
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344 r->headers_out.content_encoding = ngx_list_push(&r->headers_out.headers);
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345 if (r->headers_out.content_encoding == NULL) {
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346 return NGX_ERROR;
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347 }
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348
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349 r->headers_out.content_encoding->key.len = sizeof("Content-Encoding") - 1;
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350 r->headers_out.content_encoding->key.data = (u_char *) "Content-Encoding";
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351 r->headers_out.content_encoding->value.len = sizeof("gzip") - 1;
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352 r->headers_out.content_encoding->value.data = (u_char *) "gzip";
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353
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354 ctx->length = r->headers_out.content_length_n;
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355 r->headers_out.content_length_n = -1;
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356 if (r->headers_out.content_length) {
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357 r->headers_out.content_length->key.len = 0;
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358 r->headers_out.content_length = NULL;
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359 }
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360 r->filter_need_in_memory = 1;
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361
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362 return ngx_http_next_header_filter(r);
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363 }
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364
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365
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366 static ngx_int_t
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367 ngx_http_gzip_proxied(ngx_http_request_t *r, ngx_http_gzip_conf_t *conf)
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368 {
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369 time_t date, expires;
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370
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371 if (r->headers_in.authorization
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372 && (conf->proxied & NGX_HTTP_GZIP_PROXIED_AUTH))
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373 {
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374 return NGX_OK;
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375 }
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376
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377 if (r->headers_out.expires) {
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378
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379 if (!(conf->proxied & NGX_HTTP_GZIP_PROXIED_EXPIRED)) {
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380 return NGX_DECLINED;
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381 }
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382
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383 expires = ngx_http_parse_time(r->headers_out.expires->value.data,
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384 r->headers_out.expires->value.len);
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385 if (expires == NGX_ERROR) {
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386 return NGX_DECLINED;
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387 }
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388
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389 if (r->headers_out.date) {
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390 date = ngx_http_parse_time(r->headers_out.date->value.data,
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391 r->headers_out.date->value.len);
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392 if (date == NGX_ERROR) {
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393 return NGX_DECLINED;
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394 }
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395
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396 } else {
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397 date = ngx_time();
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398 }
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399
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400 if (expires < date) {
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401 return NGX_OK;
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402 }
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403
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404 return NGX_DECLINED;
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405 }
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406
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407 if (r->headers_out.cache_control) {
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408
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409 if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_NO_CACHE)
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410 && ngx_strstr(r->headers_out.cache_control->value.data, "no-cache"))
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411 {
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412 return NGX_OK;
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413 }
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414
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415 if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_NO_STORE)
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416 && ngx_strstr(r->headers_out.cache_control->value.data, "no-store"))
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417 {
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418 return NGX_OK;
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419 }
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420
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421 if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_PRIVATE)
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422 && ngx_strstr(r->headers_out.cache_control->value.data, "private"))
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423 {
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424 return NGX_OK;
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425 }
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426
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427 return NGX_DECLINED;
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428 }
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429
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430 if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_NO_LM)
|
|
431 && r->headers_out.last_modified)
|
|
432 {
|
|
433 return NGX_DECLINED;
|
|
434 }
|
|
435
|
|
436 if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_NO_ETAG)
|
|
437 && r->headers_out.etag)
|
|
438 {
|
|
439 return NGX_DECLINED;
|
|
440 }
|
|
441
|
|
442 return NGX_OK;
|
|
443 }
|
|
444
|
|
445
|
|
446 static ngx_int_t
|
|
447 ngx_http_gzip_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
|
|
448 {
|
|
449 int rc, wbits, memlevel;
|
|
450 ngx_int_t last;
|
|
451 struct gztrailer *trailer;
|
|
452 ngx_buf_t *b;
|
|
453 ngx_chain_t *cl, out;
|
|
454 ngx_http_gzip_ctx_t *ctx;
|
|
455 ngx_http_gzip_conf_t *conf;
|
|
456
|
|
457 ctx = ngx_http_get_module_ctx(r, ngx_http_gzip_filter_module);
|
|
458
|
|
459 if (ctx == NULL || ctx->done) {
|
|
460 return ngx_http_next_body_filter(r, in);
|
|
461 }
|
|
462
|
|
463 conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module);
|
|
464
|
|
465 if (ctx->preallocated == NULL) {
|
|
466 wbits = conf->wbits;
|
|
467 memlevel = conf->memlevel;
|
|
468
|
|
469 if (ctx->length > 0) {
|
|
470
|
|
471 /* the actual zlib window size is smaller by 262 bytes */
|
|
472
|
|
473 while (ctx->length < ((1 << (wbits - 1)) - 262)) {
|
|
474 wbits--;
|
|
475 memlevel--;
|
|
476 }
|
|
477 }
|
|
478
|
|
479 /*
|
|
480 * We preallocate a memory for zlib in one buffer (200K-400K), this
|
|
481 * decreases a number of malloc() and free() calls and also probably
|
|
482 * decreases a number of syscalls (sbrk() and so on).
|
|
483 * Besides we free this memory as soon as the gzipping will complete
|
|
484 * and do not wait while a whole response will be sent to a client.
|
|
485 *
|
|
486 * 8K is for zlib deflate_state, it takes
|
|
487 * * 5816 bytes on x86 and sparc64 (32-bit mode)
|
|
488 * * 5920 bytes on amd64 and sparc64
|
|
489 */
|
|
490
|
|
491 ctx->allocated = 8192 + (1 << (wbits + 2)) + (1 << (memlevel + 9));
|
|
492
|
|
493 ctx->preallocated = ngx_palloc(r->pool, ctx->allocated);
|
|
494 if (ctx->preallocated == NULL) {
|
|
495 return NGX_ERROR;
|
|
496 }
|
|
497
|
|
498 ctx->free_mem = ctx->preallocated;
|
|
499
|
|
500 ctx->zstream.zalloc = ngx_http_gzip_filter_alloc;
|
|
501 ctx->zstream.zfree = ngx_http_gzip_filter_free;
|
|
502 ctx->zstream.opaque = ctx;
|
|
503
|
|
504 rc = deflateInit2(&ctx->zstream, conf->level, Z_DEFLATED,
|
|
505 -wbits, memlevel, Z_DEFAULT_STRATEGY);
|
|
506
|
|
507 if (rc != Z_OK) {
|
|
508 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
|
|
509 "deflateInit2() failed: %d", rc);
|
|
510 ngx_http_gzip_error(ctx);
|
|
511 return NGX_ERROR;
|
|
512 }
|
|
513
|
|
514 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
|
|
515 if (b == NULL) {
|
|
516 ngx_http_gzip_error(ctx);
|
|
517 return NGX_ERROR;
|
|
518 }
|
|
519
|
|
520 b->memory = 1;
|
|
521 b->pos = gzheader;
|
|
522 b->last = b->pos + 10;
|
|
523
|
|
524 out.buf = b;
|
|
525 out.next = NULL;
|
|
526
|
|
527 /*
|
|
528 * We pass the gzheader to the next filter now to avoid its linking
|
|
529 * to the ctx->busy chain. zlib does not usually output the compressed
|
|
530 * data in the initial iterations, so the gzheader that was linked
|
|
531 * to the ctx->busy chain would be flushed by ngx_http_write_filter().
|
|
532 */
|
|
533
|
|
534 if (ngx_http_next_body_filter(r, &out) == NGX_ERROR) {
|
|
535 ngx_http_gzip_error(ctx);
|
|
536 return NGX_ERROR;
|
|
537 }
|
|
538
|
|
539 ctx->last_out = &ctx->out;
|
|
540
|
|
541 ctx->crc32 = crc32(0L, Z_NULL, 0);
|
|
542 ctx->flush = Z_NO_FLUSH;
|
|
543 }
|
|
544
|
|
545 if (in) {
|
|
546 if (ngx_chain_add_copy(r->pool, &ctx->in, in) == NGX_ERROR) {
|
|
547 ngx_http_gzip_error(ctx);
|
|
548 return NGX_ERROR;
|
|
549 }
|
|
550 }
|
|
551
|
|
552 last = NGX_NONE;
|
|
553
|
|
554 for ( ;; ) {
|
|
555
|
|
556 for ( ;; ) {
|
|
557
|
|
558 /* does zlib need a new data ? */
|
|
559
|
|
560 if (ctx->zstream.avail_in == 0
|
|
561 && ctx->flush == Z_NO_FLUSH
|
|
562 && !ctx->redo)
|
|
563 {
|
|
564 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
565 "gzip in: %p", ctx->in);
|
|
566
|
|
567 if (ctx->in == NULL) {
|
|
568 break;
|
|
569 }
|
|
570
|
|
571 ctx->in_buf = ctx->in->buf;
|
|
572 ctx->in = ctx->in->next;
|
|
573
|
|
574 ctx->zstream.next_in = ctx->in_buf->pos;
|
|
575 ctx->zstream.avail_in = ctx->in_buf->last - ctx->in_buf->pos;
|
|
576
|
|
577 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
578 "gzip in_buf:%p ni:%p ai:%ud",
|
|
579 ctx->in_buf,
|
|
580 ctx->zstream.next_in, ctx->zstream.avail_in);
|
|
581
|
|
582 /* STUB */
|
|
583 if (ctx->in_buf->last < ctx->in_buf->pos) {
|
|
584 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
|
|
585 "zstream.avail_in is huge");
|
|
586 ctx->done = 1;
|
|
587 return NGX_ERROR;
|
|
588 }
|
|
589 /**/
|
|
590
|
|
591 if (ctx->in_buf->last_buf) {
|
|
592 ctx->flush = Z_FINISH;
|
|
593
|
|
594 } else if (ctx->in_buf->flush) {
|
|
595 ctx->flush = Z_SYNC_FLUSH;
|
|
596 }
|
|
597
|
|
598 if (ctx->zstream.avail_in == 0) {
|
|
599 if (ctx->flush == Z_NO_FLUSH) {
|
|
600 continue;
|
|
601 }
|
|
602
|
|
603 } else {
|
|
604 ctx->crc32 = crc32(ctx->crc32, ctx->zstream.next_in,
|
|
605 ctx->zstream.avail_in);
|
|
606 }
|
|
607 }
|
|
608
|
|
609
|
|
610 /* is there a space for the gzipped data ? */
|
|
611
|
|
612 if (ctx->zstream.avail_out == 0) {
|
|
613
|
|
614 if (ctx->free) {
|
|
615 ctx->out_buf = ctx->free->buf;
|
|
616 ctx->free = ctx->free->next;
|
|
617
|
|
618 } else if (ctx->bufs < conf->bufs.num) {
|
|
619 ctx->out_buf = ngx_create_temp_buf(r->pool,
|
|
620 conf->bufs.size);
|
|
621 if (ctx->out_buf == NULL) {
|
|
622 ngx_http_gzip_error(ctx);
|
|
623 return NGX_ERROR;
|
|
624 }
|
|
625
|
|
626 ctx->out_buf->tag = (ngx_buf_tag_t)
|
|
627 &ngx_http_gzip_filter_module;
|
|
628 ctx->out_buf->recycled = 1;
|
|
629 ctx->bufs++;
|
|
630
|
|
631 } else {
|
|
632 break;
|
|
633 }
|
|
634
|
|
635 ctx->zstream.next_out = ctx->out_buf->pos;
|
|
636 ctx->zstream.avail_out = conf->bufs.size;
|
|
637 }
|
|
638
|
|
639 ngx_log_debug6(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
640 "deflate in: ni:%p no:%p ai:%ud ao:%ud fl:%d redo:%d",
|
|
641 ctx->zstream.next_in, ctx->zstream.next_out,
|
|
642 ctx->zstream.avail_in, ctx->zstream.avail_out,
|
|
643 ctx->flush, ctx->redo);
|
|
644
|
|
645 rc = deflate(&ctx->zstream, ctx->flush);
|
|
646
|
|
647 if (rc != Z_OK && rc != Z_STREAM_END) {
|
|
648 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
|
|
649 "deflate() failed: %d, %d", ctx->flush, rc);
|
|
650 ngx_http_gzip_error(ctx);
|
|
651 return NGX_ERROR;
|
|
652 }
|
|
653
|
|
654 ngx_log_debug5(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
655 "deflate out: ni:%p no:%p ai:%ud ao:%ud rc:%d",
|
|
656 ctx->zstream.next_in, ctx->zstream.next_out,
|
|
657 ctx->zstream.avail_in, ctx->zstream.avail_out,
|
|
658 rc);
|
|
659
|
|
660 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
661 "gzip in_buf:%p pos:%p",
|
|
662 ctx->in_buf, ctx->in_buf->pos);
|
|
663
|
|
664
|
|
665 if (ctx->zstream.next_in) {
|
|
666 ctx->in_buf->pos = ctx->zstream.next_in;
|
|
667
|
|
668 if (ctx->zstream.avail_in == 0) {
|
|
669 ctx->zstream.next_in = NULL;
|
|
670 }
|
|
671 }
|
|
672
|
|
673 ctx->out_buf->last = ctx->zstream.next_out;
|
|
674
|
|
675 if (ctx->zstream.avail_out == 0) {
|
|
676
|
|
677 /* zlib wants to output some more gzipped data */
|
|
678
|
|
679 cl = ngx_alloc_chain_link(r->pool);
|
|
680 if (cl == NULL) {
|
|
681 ngx_http_gzip_error(ctx);
|
|
682 return NGX_ERROR;
|
|
683 }
|
|
684
|
|
685 cl->buf = ctx->out_buf;
|
|
686 cl->next = NULL;
|
|
687 *ctx->last_out = cl;
|
|
688 ctx->last_out = &cl->next;
|
|
689
|
|
690 ctx->redo = 1;
|
|
691
|
|
692 continue;
|
|
693 }
|
|
694
|
|
695 ctx->redo = 0;
|
|
696
|
|
697 if (ctx->flush == Z_SYNC_FLUSH) {
|
|
698
|
|
699 ctx->out_buf->flush = 0;
|
|
700 ctx->flush = Z_NO_FLUSH;
|
|
701
|
|
702 cl = ngx_alloc_chain_link(r->pool);
|
|
703 if (cl == NULL) {
|
|
704 ngx_http_gzip_error(ctx);
|
|
705 return NGX_ERROR;
|
|
706 }
|
|
707
|
|
708 cl->buf = ctx->out_buf;
|
|
709 cl->next = NULL;
|
|
710 *ctx->last_out = cl;
|
|
711 ctx->last_out = &cl->next;
|
|
712
|
|
713 break;
|
|
714 }
|
|
715
|
|
716 if (rc == Z_STREAM_END) {
|
|
717
|
|
718 ctx->zin = ctx->zstream.total_in;
|
|
719 ctx->zout = 10 + ctx->zstream.total_out + 8;
|
|
720
|
|
721 rc = deflateEnd(&ctx->zstream);
|
|
722
|
|
723 if (rc != Z_OK) {
|
|
724 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
|
|
725 "deflateEnd() failed: %d", rc);
|
|
726 ngx_http_gzip_error(ctx);
|
|
727 return NGX_ERROR;
|
|
728 }
|
|
729
|
|
730 ngx_pfree(r->pool, ctx->preallocated);
|
|
731
|
|
732 cl = ngx_alloc_chain_link(r->pool);
|
|
733 if (cl == NULL) {
|
|
734 ngx_http_gzip_error(ctx);
|
|
735 return NGX_ERROR;
|
|
736 }
|
|
737
|
|
738 cl->buf = ctx->out_buf;
|
|
739 cl->next = NULL;
|
|
740 *ctx->last_out = cl;
|
|
741 ctx->last_out = &cl->next;
|
|
742
|
|
743 if (ctx->zstream.avail_out >= 8) {
|
|
744 trailer = (struct gztrailer *) ctx->out_buf->last;
|
|
745 ctx->out_buf->last += 8;
|
|
746 ctx->out_buf->last_buf = 1;
|
|
747
|
|
748 } else {
|
|
749 b = ngx_create_temp_buf(r->pool, 8);
|
|
750 if (b == NULL) {
|
|
751 ngx_http_gzip_error(ctx);
|
|
752 return NGX_ERROR;
|
|
753 }
|
|
754
|
|
755 b->last_buf = 1;
|
|
756
|
|
757 cl = ngx_alloc_chain_link(r->pool);
|
|
758 if (cl == NULL) {
|
|
759 ngx_http_gzip_error(ctx);
|
|
760 return NGX_ERROR;
|
|
761 }
|
|
762
|
|
763 cl->buf = b;
|
|
764 cl->next = NULL;
|
|
765 *ctx->last_out = cl;
|
|
766 ctx->last_out = &cl->next;
|
|
767 trailer = (struct gztrailer *) b->pos;
|
|
768 b->last += 8;
|
|
769 }
|
|
770
|
|
771 #if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)
|
|
772
|
|
773 trailer->crc32 = ctx->crc32;
|
|
774 trailer->zlen = ctx->zin;
|
|
775
|
|
776 #else
|
|
777 trailer->crc32[0] = (u_char) (ctx->crc32 & 0xff);
|
|
778 trailer->crc32[1] = (u_char) ((ctx->crc32 >> 8) & 0xff);
|
|
779 trailer->crc32[2] = (u_char) ((ctx->crc32 >> 16) & 0xff);
|
|
780 trailer->crc32[3] = (u_char) ((ctx->crc32 >> 24) & 0xff);
|
|
781
|
|
782 trailer->zlen[0] = (u_char) (ctx->zin & 0xff);
|
|
783 trailer->zlen[1] = (u_char) ((ctx->zin >> 8) & 0xff);
|
|
784 trailer->zlen[2] = (u_char) ((ctx->zin >> 16) & 0xff);
|
|
785 trailer->zlen[3] = (u_char) ((ctx->zin >> 24) & 0xff);
|
|
786 #endif
|
|
787
|
|
788 ctx->zstream.avail_in = 0;
|
|
789 ctx->zstream.avail_out = 0;
|
|
790
|
|
791 ctx->done = 1;
|
|
792
|
|
793 break;
|
|
794 }
|
|
795
|
|
796 if (conf->no_buffer && ctx->in == NULL) {
|
|
797
|
|
798 cl = ngx_alloc_chain_link(r->pool);
|
|
799 if (cl == NULL) {
|
|
800 ngx_http_gzip_error(ctx);
|
|
801 return NGX_ERROR;
|
|
802 }
|
|
803
|
|
804 cl->buf = ctx->out_buf;
|
|
805 cl->next = NULL;
|
|
806 *ctx->last_out = cl;
|
|
807 ctx->last_out = &cl->next;
|
|
808
|
|
809 break;
|
|
810 }
|
|
811 }
|
|
812
|
|
813 if (last == NGX_AGAIN && !ctx->done) {
|
|
814 return NGX_AGAIN;
|
|
815 }
|
|
816
|
|
817 if (ctx->out == NULL && ctx->busy == NULL) {
|
|
818 return NGX_OK;
|
|
819 }
|
|
820
|
|
821 last = ngx_http_next_body_filter(r, ctx->out);
|
|
822
|
|
823 /*
|
|
824 * we do not check NGX_AGAIN here because the downstream filters
|
|
825 * may free some buffers and zlib may compress some data into them
|
|
826 */
|
|
827
|
|
828 if (last == NGX_ERROR) {
|
|
829 ngx_http_gzip_error(ctx);
|
|
830 return NGX_ERROR;
|
|
831 }
|
|
832
|
|
833 ngx_chain_update_chains(&ctx->free, &ctx->busy, &ctx->out,
|
|
834 (ngx_buf_tag_t) &ngx_http_gzip_filter_module);
|
|
835 ctx->last_out = &ctx->out;
|
|
836
|
|
837 if (ctx->done) {
|
|
838 return last;
|
|
839 }
|
|
840 }
|
|
841 }
|
|
842
|
|
843
|
|
844 static void *
|
|
845 ngx_http_gzip_filter_alloc(void *opaque, u_int items, u_int size)
|
|
846 {
|
|
847 ngx_http_gzip_ctx_t *ctx = opaque;
|
|
848
|
|
849 void *p;
|
|
850 ngx_uint_t alloc;
|
|
851
|
|
852 alloc = items * size;
|
|
853
|
|
854 if (alloc % 512 != 0) {
|
|
855
|
|
856 /*
|
|
857 * The zlib deflate_state allocation, it takes about 6K,
|
|
858 * we allocate 8K. Other allocations are divisible by 512.
|
|
859 */
|
|
860
|
|
861 alloc = (alloc + ngx_pagesize - 1) & ~(ngx_pagesize - 1);
|
|
862 }
|
|
863
|
|
864 if (alloc <= ctx->allocated) {
|
|
865 p = ctx->free_mem;
|
|
866 ctx->free_mem += alloc;
|
|
867 ctx->allocated -= alloc;
|
|
868
|
|
869 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0,
|
|
870 "gzip alloc: n:%ud s:%ud a:%ud p:%p",
|
|
871 items, size, alloc, p);
|
|
872
|
|
873 return p;
|
|
874 }
|
|
875
|
|
876 ngx_log_error(NGX_LOG_ALERT, ctx->request->connection->log, 0,
|
|
877 "gzip filter failed to use preallocated memory: %ud of %ud",
|
|
878 items * size, ctx->allocated);
|
|
879
|
|
880 p = ngx_palloc(ctx->request->pool, items * size);
|
|
881
|
|
882 return p;
|
|
883 }
|
|
884
|
|
885
|
|
886 static void
|
|
887 ngx_http_gzip_filter_free(void *opaque, void *address)
|
|
888 {
|
|
889 #if 0
|
|
890 ngx_http_gzip_ctx_t *ctx = opaque;
|
|
891
|
|
892 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0,
|
|
893 "gzip free: %p", address);
|
|
894 #endif
|
|
895 }
|
|
896
|
|
897
|
|
898 static u_char *
|
|
899 ngx_http_gzip_log_ratio(ngx_http_request_t *r, u_char *buf,
|
|
900 ngx_http_log_op_t *op)
|
|
901 {
|
|
902 ngx_uint_t zint, zfrac;
|
|
903 ngx_http_gzip_ctx_t *ctx;
|
|
904
|
|
905 ctx = ngx_http_get_module_ctx(r, ngx_http_gzip_filter_module);
|
|
906
|
|
907 if (ctx == NULL || ctx->zout == 0) {
|
|
908 *buf = '-';
|
|
909 return buf + 1;
|
|
910 }
|
|
911
|
|
912 zint = (ngx_uint_t) (ctx->zin / ctx->zout);
|
|
913 zfrac = (ngx_uint_t) ((ctx->zin * 100 / ctx->zout) % 100);
|
|
914
|
|
915 if ((ctx->zin * 1000 / ctx->zout) % 10 > 4) {
|
|
916
|
|
917 /* the rounding, e.g., 2.125 to 2.13 */
|
|
918
|
|
919 zfrac++;
|
|
920
|
|
921 if (zfrac > 99) {
|
|
922 zint++;
|
|
923 zfrac = 0;
|
|
924 }
|
|
925 }
|
|
926
|
|
927 return ngx_sprintf(buf, "%ui.%02ui", zint, zfrac);
|
|
928 }
|
|
929
|
|
930
|
|
931 static void
|
|
932 ngx_http_gzip_error(ngx_http_gzip_ctx_t *ctx)
|
|
933 {
|
|
934 deflateEnd(&ctx->zstream);
|
|
935
|
|
936 if (ctx->preallocated) {
|
|
937 ngx_pfree(ctx->request->pool, ctx->preallocated);
|
|
938 }
|
|
939
|
|
940 ctx->zstream.avail_in = 0;
|
|
941 ctx->zstream.avail_out = 0;
|
|
942
|
|
943 ctx->done = 1;
|
|
944
|
|
945 return;
|
|
946 }
|
|
947
|
|
948
|
|
949 static ngx_int_t
|
|
950 ngx_http_gzip_add_log_formats(ngx_conf_t *cf)
|
|
951 {
|
|
952 ngx_http_log_op_name_t *op;
|
|
953
|
|
954 for (op = ngx_http_gzip_log_fmt_ops; op->name.len; op++) { /* void */ }
|
|
955 op->run = NULL;
|
|
956
|
|
957 for (op = ngx_http_log_fmt_ops; op->run; op++) {
|
|
958 if (op->name.len == 0) {
|
|
959 op = (ngx_http_log_op_name_t *) op->run;
|
|
960 }
|
|
961 }
|
|
962
|
|
963 op->run = (ngx_http_log_op_run_pt) ngx_http_gzip_log_fmt_ops;
|
|
964
|
|
965 return NGX_OK;
|
|
966 }
|
|
967
|
|
968
|
|
969 static ngx_int_t
|
|
970 ngx_http_gzip_filter_init(ngx_cycle_t *cycle)
|
|
971 {
|
|
972 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
973 ngx_http_top_header_filter = ngx_http_gzip_header_filter;
|
|
974
|
|
975 ngx_http_next_body_filter = ngx_http_top_body_filter;
|
|
976 ngx_http_top_body_filter = ngx_http_gzip_body_filter;
|
|
977
|
|
978 return NGX_OK;
|
|
979 }
|
|
980
|
|
981
|
|
982 static void *
|
|
983 ngx_http_gzip_create_conf(ngx_conf_t *cf)
|
|
984 {
|
|
985 ngx_http_gzip_conf_t *conf;
|
|
986
|
|
987 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_gzip_conf_t));
|
|
988 if (conf == NULL) {
|
|
989 return NGX_CONF_ERROR;
|
|
990 }
|
|
991
|
|
992 /*
|
|
993 * set by ngx_pcalloc():
|
|
994 *
|
|
995 * conf->bufs.num = 0;
|
|
996 * conf->proxied = 0;
|
|
997 * conf->types = NULL;
|
|
998 */
|
|
999
|
|
1000 conf->enable = NGX_CONF_UNSET;
|
|
1001 conf->no_buffer = NGX_CONF_UNSET;
|
|
1002
|
|
1003 conf->http_version = NGX_CONF_UNSET_UINT;
|
|
1004
|
|
1005 conf->level = NGX_CONF_UNSET;
|
|
1006 conf->wbits = (size_t) NGX_CONF_UNSET;
|
|
1007 conf->memlevel = (size_t) NGX_CONF_UNSET;
|
|
1008 conf->min_length = NGX_CONF_UNSET;
|
|
1009
|
|
1010 return conf;
|
|
1011 }
|
|
1012
|
|
1013
|
|
1014 static char *
|
|
1015 ngx_http_gzip_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
1016 {
|
|
1017 ngx_http_gzip_conf_t *prev = parent;
|
|
1018 ngx_http_gzip_conf_t *conf = child;
|
|
1019
|
|
1020 ngx_http_gzip_type_t *type;
|
|
1021
|
|
1022 ngx_conf_merge_value(conf->enable, prev->enable, 0);
|
|
1023
|
|
1024 ngx_conf_merge_bufs_value(conf->bufs, prev->bufs, 4, ngx_pagesize);
|
|
1025
|
|
1026 ngx_conf_merge_unsigned_value(conf->http_version, prev->http_version,
|
|
1027 NGX_HTTP_VERSION_11);
|
|
1028 ngx_conf_merge_bitmask_value(conf->proxied, prev->proxied,
|
|
1029 (NGX_CONF_BITMASK_SET|NGX_HTTP_GZIP_PROXIED_OFF));
|
|
1030
|
|
1031 ngx_conf_merge_value(conf->level, prev->level, 1);
|
|
1032 ngx_conf_merge_size_value(conf->wbits, prev->wbits, MAX_WBITS);
|
|
1033 ngx_conf_merge_size_value(conf->memlevel, prev->memlevel,
|
|
1034 MAX_MEM_LEVEL - 1);
|
|
1035 ngx_conf_merge_value(conf->min_length, prev->min_length, 0);
|
|
1036 ngx_conf_merge_value(conf->no_buffer, prev->no_buffer, 0);
|
|
1037
|
|
1038 if (conf->types == NULL) {
|
|
1039 if (prev->types == NULL) {
|
|
1040 conf->types = ngx_array_create(cf->pool, 1,
|
|
1041 sizeof(ngx_http_gzip_type_t));
|
|
1042 if (conf->types == NULL) {
|
|
1043 return NGX_CONF_ERROR;
|
|
1044 }
|
|
1045
|
|
1046 type = ngx_array_push(conf->types);
|
|
1047 if (type == NULL) {
|
|
1048 return NGX_CONF_ERROR;
|
|
1049 }
|
|
1050
|
|
1051 type->name.len = sizeof("text/html") - 1;
|
|
1052 type->name.data = (u_char *) "text/html";
|
|
1053 type->enable = 1;
|
|
1054
|
|
1055 } else {
|
|
1056 conf->types = prev->types;
|
|
1057 }
|
|
1058 }
|
|
1059
|
|
1060 return NGX_CONF_OK;
|
|
1061 }
|
|
1062
|
|
1063
|
|
1064 static char *
|
|
1065 ngx_http_gzip_set_types(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
1066 {
|
|
1067 ngx_http_gzip_conf_t *gcf = conf;
|
|
1068
|
|
1069 ngx_str_t *value;
|
|
1070 ngx_uint_t i;
|
|
1071 ngx_http_gzip_type_t *type;
|
|
1072
|
|
1073 if (gcf->types == NULL) {
|
|
1074 gcf->types = ngx_array_create(cf->pool, 4,
|
|
1075 sizeof(ngx_http_gzip_type_t));
|
|
1076 if (gcf->types == NULL) {
|
|
1077 return NGX_CONF_ERROR;
|
|
1078 }
|
|
1079
|
|
1080 type = ngx_array_push(gcf->types);
|
|
1081 if (type == NULL) {
|
|
1082 return NGX_CONF_ERROR;
|
|
1083 }
|
|
1084
|
|
1085 type->name.len = sizeof("text/html") - 1;
|
|
1086 type->name.data = (u_char *) "text/html";
|
|
1087 type->enable = 1;
|
|
1088 }
|
|
1089
|
|
1090 value = cf->args->elts;
|
|
1091
|
|
1092 for (i = 1; i < cf->args->nelts; i++) {
|
|
1093
|
|
1094 if (ngx_strcmp(value[i].data, "text/html") == 0) {
|
|
1095 continue;
|
|
1096 }
|
|
1097
|
|
1098 type = ngx_array_push(gcf->types);
|
|
1099 if (type == NULL) {
|
|
1100 return NGX_CONF_ERROR;
|
|
1101 }
|
|
1102
|
|
1103 type->name.len = value[i].len;
|
|
1104
|
|
1105 type->name.data = ngx_palloc(cf->pool, type->name.len + 1);
|
|
1106 if (type->name.data == NULL) {
|
|
1107 return NGX_CONF_ERROR;
|
|
1108 }
|
|
1109
|
|
1110 ngx_cpystrn(type->name.data, value[i].data, type->name.len + 1);
|
|
1111 }
|
|
1112
|
|
1113 return NGX_CONF_OK;
|
|
1114 }
|
|
1115
|
|
1116
|
|
1117 static char *
|
|
1118 ngx_http_gzip_set_window(ngx_conf_t *cf, void *post, void *data)
|
|
1119 {
|
|
1120 int *np = data;
|
|
1121
|
|
1122 int wbits, wsize;
|
|
1123
|
|
1124 wbits = 15;
|
|
1125
|
|
1126 for (wsize = 32 * 1024; wsize > 256; wsize >>= 1) {
|
|
1127
|
|
1128 if (wsize == *np) {
|
|
1129 *np = wbits;
|
|
1130
|
|
1131 return NGX_CONF_OK;
|
|
1132 }
|
|
1133
|
|
1134 wbits--;
|
|
1135 }
|
|
1136
|
|
1137 return "must be 512, 1k, 2k, 4k, 8k, 16k, or 32k";
|
|
1138 }
|
|
1139
|
|
1140
|
|
1141 static char *
|
|
1142 ngx_http_gzip_set_hash(ngx_conf_t *cf, void *post, void *data)
|
|
1143 {
|
|
1144 int *np = data;
|
|
1145
|
|
1146 int memlevel, hsize;
|
|
1147
|
|
1148 memlevel = 9;
|
|
1149
|
|
1150 for (hsize = 128 * 1024; hsize > 256; hsize >>= 1) {
|
|
1151
|
|
1152 if (hsize == *np) {
|
|
1153 *np = memlevel;
|
|
1154
|
|
1155 return NGX_CONF_OK;
|
|
1156 }
|
|
1157
|
|
1158 memlevel--;
|
|
1159 }
|
|
1160
|
|
1161 return "must be 512, 1k, 2k, 4k, 8k, 16k, 32k, 64k, or 128k";
|
|
1162 }
|