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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76
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18 ngx_array_t *types; /* array of ngx_str_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 #define NGX_HTTP_GZIP_PROXIED_OFF 0x0002
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33 #define NGX_HTTP_GZIP_PROXIED_EXPIRED 0x0004
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34 #define NGX_HTTP_GZIP_PROXIED_NO_CACHE 0x0008
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35 #define NGX_HTTP_GZIP_PROXIED_NO_STORE 0x0010
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36 #define NGX_HTTP_GZIP_PROXIED_PRIVATE 0x0020
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37 #define NGX_HTTP_GZIP_PROXIED_NO_LM 0x0040
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38 #define NGX_HTTP_GZIP_PROXIED_NO_ETAG 0x0080
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39 #define NGX_HTTP_GZIP_PROXIED_AUTH 0x0100
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40 #define NGX_HTTP_GZIP_PROXIED_ANY 0x0200
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41
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42
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43 typedef struct {
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44 ngx_chain_t *in;
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45 ngx_chain_t *free;
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46 ngx_chain_t *busy;
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47 ngx_chain_t *out;
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48 ngx_chain_t **last_out;
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49 ngx_buf_t *in_buf;
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50 ngx_buf_t *out_buf;
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51 ngx_int_t bufs;
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52
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53 off_t length;
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54
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55 void *preallocated;
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56 char *free_mem;
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57 ngx_uint_t allocated;
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58
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59 unsigned flush:4;
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60 unsigned redo:1;
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61 unsigned done:1;
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62
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63 size_t zin;
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64 size_t zout;
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65
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66 uint32_t crc32;
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67 z_stream zstream;
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68 ngx_http_request_t *request;
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69 } ngx_http_gzip_ctx_t;
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70
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71
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72 static ngx_int_t ngx_http_gzip_proxied(ngx_http_request_t *r,
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73 ngx_http_gzip_conf_t *conf);
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74 static void *ngx_http_gzip_filter_alloc(void *opaque, u_int items,
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75 u_int size);
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76 static void ngx_http_gzip_filter_free(void *opaque, void *address);
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77 static void ngx_http_gzip_error(ngx_http_gzip_ctx_t *ctx);
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78
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79 static u_char *ngx_http_gzip_log_ratio(ngx_http_request_t *r, u_char *buf,
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80 ngx_http_log_op_t *op);
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81
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82 static ngx_int_t ngx_http_gzip_add_log_formats(ngx_conf_t *cf);
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83
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84 static ngx_int_t ngx_http_gzip_filter_init(ngx_cycle_t *cycle);
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85 static void *ngx_http_gzip_create_conf(ngx_conf_t *cf);
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86 static char *ngx_http_gzip_merge_conf(ngx_conf_t *cf,
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87 void *parent, void *child);
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88 static char *ngx_http_gzip_types(ngx_conf_t *cf, ngx_command_t *cmd,
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89 void *conf);
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90 static char *ngx_http_gzip_window(ngx_conf_t *cf, void *post, void *data);
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91 static char *ngx_http_gzip_hash(ngx_conf_t *cf, void *post, void *data);
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92
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93
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94 static ngx_conf_num_bounds_t ngx_http_gzip_comp_level_bounds = {
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95 ngx_conf_check_num_bounds, 1, 9
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96 };
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97
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98 static ngx_conf_post_handler_pt ngx_http_gzip_window_p = ngx_http_gzip_window;
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99 static ngx_conf_post_handler_pt ngx_http_gzip_hash_p = ngx_http_gzip_hash;
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100
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101
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102
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103 static ngx_conf_enum_t ngx_http_gzip_http_version[] = {
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104 { ngx_string("1.0"), NGX_HTTP_VERSION_10 },
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105 { ngx_string("1.1"), NGX_HTTP_VERSION_11 },
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106 { ngx_null_string, 0 }
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107 };
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108
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109
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110 static ngx_conf_bitmask_t ngx_http_gzip_proxied_mask[] = {
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111 { ngx_string("off"), NGX_HTTP_GZIP_PROXIED_OFF },
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112 { ngx_string("expired"), NGX_HTTP_GZIP_PROXIED_EXPIRED },
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113 { ngx_string("no-cache"), NGX_HTTP_GZIP_PROXIED_NO_CACHE },
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114 { ngx_string("no-store"), NGX_HTTP_GZIP_PROXIED_NO_STORE },
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115 { ngx_string("private"), NGX_HTTP_GZIP_PROXIED_PRIVATE },
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116 { ngx_string("no_last_modified"), NGX_HTTP_GZIP_PROXIED_NO_LM },
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117 { ngx_string("no_etag"), NGX_HTTP_GZIP_PROXIED_NO_ETAG },
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118 { ngx_string("auth"), NGX_HTTP_GZIP_PROXIED_AUTH },
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119 { ngx_string("any"), NGX_HTTP_GZIP_PROXIED_ANY },
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120 { ngx_null_string, 0 }
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121 };
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122
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123
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124 static ngx_command_t ngx_http_gzip_filter_commands[] = {
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125
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126 { ngx_string("gzip"),
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127 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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128 |NGX_CONF_FLAG,
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129 ngx_conf_set_flag_slot,
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130 NGX_HTTP_LOC_CONF_OFFSET,
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131 offsetof(ngx_http_gzip_conf_t, enable),
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132 NULL },
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133
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134 { ngx_string("gzip_buffers"),
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135 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
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136 ngx_conf_set_bufs_slot,
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137 NGX_HTTP_LOC_CONF_OFFSET,
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138 offsetof(ngx_http_gzip_conf_t, bufs),
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139 NULL },
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140
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141 { ngx_string("gzip_types"),
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142 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
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143 ngx_http_gzip_types,
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144 NGX_HTTP_LOC_CONF_OFFSET,
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145 0,
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146 NULL },
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147
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148 { ngx_string("gzip_comp_level"),
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149 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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150 ngx_conf_set_num_slot,
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151 NGX_HTTP_LOC_CONF_OFFSET,
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152 offsetof(ngx_http_gzip_conf_t, level),
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153 &ngx_http_gzip_comp_level_bounds },
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154
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155 { ngx_string("gzip_window"),
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156 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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157 ngx_conf_set_size_slot,
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158 NGX_HTTP_LOC_CONF_OFFSET,
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159 offsetof(ngx_http_gzip_conf_t, wbits),
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160 &ngx_http_gzip_window_p },
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161
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162 { ngx_string("gzip_hash"),
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163 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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164 ngx_conf_set_size_slot,
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165 NGX_HTTP_LOC_CONF_OFFSET,
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166 offsetof(ngx_http_gzip_conf_t, memlevel),
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167 &ngx_http_gzip_hash_p },
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168
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169 { ngx_string("gzip_no_buffer"),
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170 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
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171 ngx_conf_set_flag_slot,
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172 NGX_HTTP_LOC_CONF_OFFSET,
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173 offsetof(ngx_http_gzip_conf_t, no_buffer),
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174 NULL },
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175
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176 { ngx_string("gzip_http_version"),
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177 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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178 ngx_conf_set_enum_slot,
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179 NGX_HTTP_LOC_CONF_OFFSET,
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180 offsetof(ngx_http_gzip_conf_t, http_version),
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181 &ngx_http_gzip_http_version },
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182
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183 { ngx_string("gzip_proxied"),
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184 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
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185 ngx_conf_set_bitmask_slot,
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186 NGX_HTTP_LOC_CONF_OFFSET,
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187 offsetof(ngx_http_gzip_conf_t, proxied),
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188 &ngx_http_gzip_proxied_mask },
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189
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190 { ngx_string("gzip_min_length"),
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191 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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192 ngx_conf_set_size_slot,
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193 NGX_HTTP_LOC_CONF_OFFSET,
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194 offsetof(ngx_http_gzip_conf_t, min_length),
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195 NULL },
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196
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197 ngx_null_command
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198 };
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199
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200
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201 static ngx_http_module_t ngx_http_gzip_filter_module_ctx = {
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202 ngx_http_gzip_add_log_formats, /* preconfiguration */
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203 NULL, /* postconfiguration */
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204
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205 NULL, /* create main configuration */
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206 NULL, /* init main configuration */
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207
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208 NULL, /* create server configuration */
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209 NULL, /* merge server configuration */
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210
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211 ngx_http_gzip_create_conf, /* create location configuration */
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212 ngx_http_gzip_merge_conf /* merge location configuration */
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213 };
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214
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215
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216 ngx_module_t ngx_http_gzip_filter_module = {
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217 NGX_MODULE_V1,
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218 &ngx_http_gzip_filter_module_ctx, /* module context */
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219 ngx_http_gzip_filter_commands, /* module directives */
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220 NGX_HTTP_MODULE, /* module type */
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221 NULL, /* init master */
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222 ngx_http_gzip_filter_init, /* init module */
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223 NULL, /* init process */
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224 NULL, /* init thread */
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225 NULL, /* exit thread */
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226 NULL, /* exit process */
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227 NULL, /* exit master */
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228 NGX_MODULE_V1_PADDING
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229 };
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230
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231
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232 static ngx_http_log_op_name_t ngx_http_gzip_log_fmt_ops[] = {
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233 { ngx_string("gzip_ratio"), NGX_INT32_LEN + 3,
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234 NULL, NULL, ngx_http_gzip_log_ratio },
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235 { ngx_null_string, 0, NULL, NULL, NULL }
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236 };
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237
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238
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239
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240 static u_char gzheader[10] = { 0x1f, 0x8b, Z_DEFLATED, 0, 0, 0, 0, 0, 0, 3 };
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241
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242 #if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)
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243
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244 struct gztrailer {
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245 uint32_t crc32;
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246 uint32_t zlen;
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247 };
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248
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249 #else /* NGX_HAVE_BIG_ENDIAN || !NGX_HAVE_NONALIGNED */
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250
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251 struct gztrailer {
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252 u_char crc32[4];
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253 u_char zlen[4];
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254 };
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255
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256 #endif
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257
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258
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259 static ngx_str_t ngx_http_gzip_no_cache = ngx_string("no-cache");
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260 static ngx_str_t ngx_http_gzip_no_store = ngx_string("no-store");
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261 static ngx_str_t ngx_http_gzip_private = ngx_string("private");
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262
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263
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264 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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265 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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266
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267
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268 static ngx_int_t
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269 ngx_http_gzip_header_filter(ngx_http_request_t *r)
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270 {
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271 ngx_str_t *type;
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272 ngx_uint_t i;
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273 ngx_http_gzip_ctx_t *ctx;
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274 ngx_http_gzip_conf_t *conf;
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275
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276 conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module);
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277
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278 if (!conf->enable
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279 || (r->headers_out.status != NGX_HTTP_OK
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280 && r->headers_out.status != NGX_HTTP_FORBIDDEN
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281 && r->headers_out.status != NGX_HTTP_NOT_FOUND)
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282 || r->header_only
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283 || r->main
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284 || r->http_version < conf->http_version
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285 || r->headers_out.content_type.len == 0
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286 || (r->headers_out.content_encoding
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287 && r->headers_out.content_encoding->value.len)
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288 || r->headers_in.accept_encoding == NULL
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289 || (r->headers_out.content_length_n != -1
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290 && r->headers_out.content_length_n < conf->min_length)
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291 || ngx_strstr(r->headers_in.accept_encoding->value.data, "gzip") == NULL
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292 )
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293 {
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294 return ngx_http_next_header_filter(r);
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295 }
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296
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297
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298 type = conf->types->elts;
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299 for (i = 0; i < conf->types->nelts; i++) {
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300 if (r->headers_out.content_type.len >= type[i].len
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301 && ngx_strncasecmp(r->headers_out.content_type.data,
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302 type[i].data, type[i].len) == 0)
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303 {
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304 goto found;
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305 }
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306 }
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307
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308 return ngx_http_next_header_filter(r);
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309
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310
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311 found:
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312
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313 if (r->headers_in.via) {
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314 if (conf->proxied & NGX_HTTP_GZIP_PROXIED_OFF) {
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315 return ngx_http_next_header_filter(r);
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316 }
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317
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318 if (!(conf->proxied & NGX_HTTP_GZIP_PROXIED_ANY)
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319 && ngx_http_gzip_proxied(r, conf) == NGX_DECLINED)
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320 {
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321 return ngx_http_next_header_filter(r);
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322 }
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323 }
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324
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325
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326 /*
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327 * if the URL (without the "http://" prefix) is longer than 253 bytes
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328 * then MSIE 4.x can not handle the compressed stream - it waits too long,
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329 * hangs up or crashes
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330 */
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331
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332 if (r->headers_in.msie4 && r->unparsed_uri.len > 200) {
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333 return ngx_http_next_header_filter(r);
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334 }
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335
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336 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_gzip_ctx_t));
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337 if (ctx == NULL) {
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338 return NGX_ERROR;
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339 }
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340
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341 ngx_http_set_ctx(r, ctx, ngx_http_gzip_filter_module);
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342
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343
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344 ctx->request = r;
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345
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346 r->headers_out.content_encoding = ngx_list_push(&r->headers_out.headers);
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347 if (r->headers_out.content_encoding == NULL) {
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348 return NGX_ERROR;
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349 }
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350
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351 r->headers_out.content_encoding->hash = 1;
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352 r->headers_out.content_encoding->key.len = sizeof("Content-Encoding") - 1;
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353 r->headers_out.content_encoding->key.data = (u_char *) "Content-Encoding";
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354 r->headers_out.content_encoding->value.len = sizeof("gzip") - 1;
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355 r->headers_out.content_encoding->value.data = (u_char *) "gzip";
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356
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357 ctx->length = r->headers_out.content_length_n;
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358 r->headers_out.content_length_n = -1;
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359
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50
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360 if (r->headers_out.content_length) {
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361 r->headers_out.content_length->hash = 0;
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362 r->headers_out.content_length = NULL;
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363 }
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58
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364
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62
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365 r->main_filter_need_in_memory = 1;
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366
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367 return ngx_http_next_header_filter(r);
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368 }
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369
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370
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371 static ngx_int_t
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372 ngx_http_gzip_proxied(ngx_http_request_t *r, ngx_http_gzip_conf_t *conf)
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373 {
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374 time_t date, expires;
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375
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376 if (r->headers_in.authorization
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377 && (conf->proxied & NGX_HTTP_GZIP_PROXIED_AUTH))
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378 {
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379 return NGX_OK;
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380 }
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381
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382 if (r->headers_out.expires) {
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383
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384 if (!(conf->proxied & NGX_HTTP_GZIP_PROXIED_EXPIRED)) {
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385 return NGX_DECLINED;
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386 }
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387
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388 expires = ngx_http_parse_time(r->headers_out.expires->value.data,
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389 r->headers_out.expires->value.len);
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390 if (expires == NGX_ERROR) {
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391 return NGX_DECLINED;
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392 }
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393
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394 if (r->headers_out.date) {
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395 date = ngx_http_parse_time(r->headers_out.date->value.data,
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396 r->headers_out.date->value.len);
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397 if (date == NGX_ERROR) {
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398 return NGX_DECLINED;
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399 }
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400
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401 } else {
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402 date = ngx_time();
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403 }
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404
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405 if (expires < date) {
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406 return NGX_OK;
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407 }
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408
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409 return NGX_DECLINED;
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410 }
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411
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58
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412 if (r->headers_out.cache_control.elts) {
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413
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414 if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_NO_CACHE)
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415 && ngx_http_parse_multi_header_lines(&r->headers_out.cache_control,
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416 &ngx_http_gzip_no_cache, NULL) >= 0)
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417 {
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418 return NGX_OK;
|
|
419 }
|
|
420
|
|
421 if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_NO_STORE)
|
58
|
422 && ngx_http_parse_multi_header_lines(&r->headers_out.cache_control,
|
|
423 &ngx_http_gzip_no_store, NULL) >= 0)
|
50
|
424 {
|
|
425 return NGX_OK;
|
|
426 }
|
|
427
|
|
428 if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_PRIVATE)
|
58
|
429 && ngx_http_parse_multi_header_lines(&r->headers_out.cache_control,
|
|
430 &ngx_http_gzip_private, NULL) >= 0)
|
50
|
431 {
|
|
432 return NGX_OK;
|
|
433 }
|
|
434
|
|
435 return NGX_DECLINED;
|
|
436 }
|
|
437
|
|
438 if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_NO_LM)
|
|
439 && r->headers_out.last_modified)
|
|
440 {
|
|
441 return NGX_DECLINED;
|
|
442 }
|
|
443
|
|
444 if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_NO_ETAG)
|
|
445 && r->headers_out.etag)
|
|
446 {
|
|
447 return NGX_DECLINED;
|
|
448 }
|
|
449
|
|
450 return NGX_OK;
|
|
451 }
|
|
452
|
|
453
|
|
454 static ngx_int_t
|
|
455 ngx_http_gzip_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
|
|
456 {
|
|
457 int rc, wbits, memlevel;
|
|
458 ngx_int_t last;
|
|
459 struct gztrailer *trailer;
|
|
460 ngx_buf_t *b;
|
|
461 ngx_chain_t *cl, out;
|
|
462 ngx_http_gzip_ctx_t *ctx;
|
|
463 ngx_http_gzip_conf_t *conf;
|
|
464
|
|
465 ctx = ngx_http_get_module_ctx(r, ngx_http_gzip_filter_module);
|
|
466
|
|
467 if (ctx == NULL || ctx->done) {
|
|
468 return ngx_http_next_body_filter(r, in);
|
|
469 }
|
|
470
|
|
471 conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module);
|
|
472
|
|
473 if (ctx->preallocated == NULL) {
|
|
474 wbits = conf->wbits;
|
|
475 memlevel = conf->memlevel;
|
|
476
|
|
477 if (ctx->length > 0) {
|
|
478
|
|
479 /* the actual zlib window size is smaller by 262 bytes */
|
|
480
|
|
481 while (ctx->length < ((1 << (wbits - 1)) - 262)) {
|
|
482 wbits--;
|
|
483 memlevel--;
|
|
484 }
|
|
485 }
|
|
486
|
|
487 /*
|
|
488 * We preallocate a memory for zlib in one buffer (200K-400K), this
|
|
489 * decreases a number of malloc() and free() calls and also probably
|
|
490 * decreases a number of syscalls (sbrk() and so on).
|
|
491 * Besides we free this memory as soon as the gzipping will complete
|
|
492 * and do not wait while a whole response will be sent to a client.
|
|
493 *
|
|
494 * 8K is for zlib deflate_state, it takes
|
58
|
495 * *) 5816 bytes on i386 and sparc64 (32-bit mode)
|
|
496 * *) 5920 bytes on amd64 and sparc64
|
50
|
497 */
|
|
498
|
|
499 ctx->allocated = 8192 + (1 << (wbits + 2)) + (1 << (memlevel + 9));
|
|
500
|
|
501 ctx->preallocated = ngx_palloc(r->pool, ctx->allocated);
|
|
502 if (ctx->preallocated == NULL) {
|
|
503 return NGX_ERROR;
|
|
504 }
|
|
505
|
|
506 ctx->free_mem = ctx->preallocated;
|
|
507
|
|
508 ctx->zstream.zalloc = ngx_http_gzip_filter_alloc;
|
|
509 ctx->zstream.zfree = ngx_http_gzip_filter_free;
|
|
510 ctx->zstream.opaque = ctx;
|
|
511
|
|
512 rc = deflateInit2(&ctx->zstream, conf->level, Z_DEFLATED,
|
|
513 -wbits, memlevel, Z_DEFAULT_STRATEGY);
|
|
514
|
|
515 if (rc != Z_OK) {
|
|
516 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
|
|
517 "deflateInit2() failed: %d", rc);
|
|
518 ngx_http_gzip_error(ctx);
|
|
519 return NGX_ERROR;
|
|
520 }
|
|
521
|
|
522 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
|
|
523 if (b == NULL) {
|
|
524 ngx_http_gzip_error(ctx);
|
|
525 return NGX_ERROR;
|
|
526 }
|
|
527
|
|
528 b->memory = 1;
|
|
529 b->pos = gzheader;
|
|
530 b->last = b->pos + 10;
|
|
531
|
|
532 out.buf = b;
|
|
533 out.next = NULL;
|
|
534
|
|
535 /*
|
|
536 * We pass the gzheader to the next filter now to avoid its linking
|
|
537 * to the ctx->busy chain. zlib does not usually output the compressed
|
|
538 * data in the initial iterations, so the gzheader that was linked
|
|
539 * to the ctx->busy chain would be flushed by ngx_http_write_filter().
|
|
540 */
|
|
541
|
|
542 if (ngx_http_next_body_filter(r, &out) == NGX_ERROR) {
|
|
543 ngx_http_gzip_error(ctx);
|
|
544 return NGX_ERROR;
|
|
545 }
|
|
546
|
|
547 ctx->last_out = &ctx->out;
|
|
548
|
|
549 ctx->crc32 = crc32(0L, Z_NULL, 0);
|
|
550 ctx->flush = Z_NO_FLUSH;
|
|
551 }
|
|
552
|
|
553 if (in) {
|
|
554 if (ngx_chain_add_copy(r->pool, &ctx->in, in) == NGX_ERROR) {
|
|
555 ngx_http_gzip_error(ctx);
|
|
556 return NGX_ERROR;
|
|
557 }
|
|
558 }
|
|
559
|
|
560 last = NGX_NONE;
|
|
561
|
|
562 for ( ;; ) {
|
|
563
|
|
564 for ( ;; ) {
|
|
565
|
|
566 /* does zlib need a new data ? */
|
|
567
|
|
568 if (ctx->zstream.avail_in == 0
|
|
569 && ctx->flush == Z_NO_FLUSH
|
|
570 && !ctx->redo)
|
|
571 {
|
|
572 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
573 "gzip in: %p", ctx->in);
|
|
574
|
|
575 if (ctx->in == NULL) {
|
|
576 break;
|
|
577 }
|
|
578
|
|
579 ctx->in_buf = ctx->in->buf;
|
|
580 ctx->in = ctx->in->next;
|
|
581
|
|
582 ctx->zstream.next_in = ctx->in_buf->pos;
|
|
583 ctx->zstream.avail_in = ctx->in_buf->last - ctx->in_buf->pos;
|
|
584
|
|
585 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
586 "gzip in_buf:%p ni:%p ai:%ud",
|
|
587 ctx->in_buf,
|
|
588 ctx->zstream.next_in, ctx->zstream.avail_in);
|
|
589
|
|
590 /* STUB */
|
|
591 if (ctx->in_buf->last < ctx->in_buf->pos) {
|
|
592 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
|
|
593 "zstream.avail_in is huge");
|
|
594 ctx->done = 1;
|
|
595 return NGX_ERROR;
|
|
596 }
|
|
597 /**/
|
|
598
|
|
599 if (ctx->in_buf->last_buf) {
|
|
600 ctx->flush = Z_FINISH;
|
|
601
|
|
602 } else if (ctx->in_buf->flush) {
|
|
603 ctx->flush = Z_SYNC_FLUSH;
|
|
604 }
|
|
605
|
|
606 if (ctx->zstream.avail_in == 0) {
|
|
607 if (ctx->flush == Z_NO_FLUSH) {
|
|
608 continue;
|
|
609 }
|
|
610
|
|
611 } else {
|
|
612 ctx->crc32 = crc32(ctx->crc32, ctx->zstream.next_in,
|
|
613 ctx->zstream.avail_in);
|
|
614 }
|
|
615 }
|
|
616
|
|
617
|
|
618 /* is there a space for the gzipped data ? */
|
|
619
|
|
620 if (ctx->zstream.avail_out == 0) {
|
|
621
|
|
622 if (ctx->free) {
|
|
623 ctx->out_buf = ctx->free->buf;
|
|
624 ctx->free = ctx->free->next;
|
|
625
|
|
626 } else if (ctx->bufs < conf->bufs.num) {
|
|
627 ctx->out_buf = ngx_create_temp_buf(r->pool,
|
|
628 conf->bufs.size);
|
|
629 if (ctx->out_buf == NULL) {
|
|
630 ngx_http_gzip_error(ctx);
|
|
631 return NGX_ERROR;
|
|
632 }
|
|
633
|
|
634 ctx->out_buf->tag = (ngx_buf_tag_t)
|
|
635 &ngx_http_gzip_filter_module;
|
|
636 ctx->out_buf->recycled = 1;
|
|
637 ctx->bufs++;
|
|
638
|
|
639 } else {
|
|
640 break;
|
|
641 }
|
|
642
|
|
643 ctx->zstream.next_out = ctx->out_buf->pos;
|
|
644 ctx->zstream.avail_out = conf->bufs.size;
|
|
645 }
|
|
646
|
|
647 ngx_log_debug6(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
648 "deflate in: ni:%p no:%p ai:%ud ao:%ud fl:%d redo:%d",
|
|
649 ctx->zstream.next_in, ctx->zstream.next_out,
|
|
650 ctx->zstream.avail_in, ctx->zstream.avail_out,
|
|
651 ctx->flush, ctx->redo);
|
|
652
|
|
653 rc = deflate(&ctx->zstream, ctx->flush);
|
|
654
|
|
655 if (rc != Z_OK && rc != Z_STREAM_END) {
|
|
656 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
|
|
657 "deflate() failed: %d, %d", ctx->flush, rc);
|
|
658 ngx_http_gzip_error(ctx);
|
|
659 return NGX_ERROR;
|
|
660 }
|
|
661
|
|
662 ngx_log_debug5(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
663 "deflate out: ni:%p no:%p ai:%ud ao:%ud rc:%d",
|
|
664 ctx->zstream.next_in, ctx->zstream.next_out,
|
|
665 ctx->zstream.avail_in, ctx->zstream.avail_out,
|
|
666 rc);
|
|
667
|
|
668 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
669 "gzip in_buf:%p pos:%p",
|
|
670 ctx->in_buf, ctx->in_buf->pos);
|
|
671
|
|
672
|
|
673 if (ctx->zstream.next_in) {
|
|
674 ctx->in_buf->pos = ctx->zstream.next_in;
|
|
675
|
|
676 if (ctx->zstream.avail_in == 0) {
|
|
677 ctx->zstream.next_in = NULL;
|
|
678 }
|
|
679 }
|
|
680
|
|
681 ctx->out_buf->last = ctx->zstream.next_out;
|
|
682
|
|
683 if (ctx->zstream.avail_out == 0) {
|
|
684
|
|
685 /* zlib wants to output some more gzipped data */
|
|
686
|
|
687 cl = ngx_alloc_chain_link(r->pool);
|
|
688 if (cl == NULL) {
|
|
689 ngx_http_gzip_error(ctx);
|
|
690 return NGX_ERROR;
|
|
691 }
|
|
692
|
|
693 cl->buf = ctx->out_buf;
|
|
694 cl->next = NULL;
|
|
695 *ctx->last_out = cl;
|
|
696 ctx->last_out = &cl->next;
|
|
697
|
|
698 ctx->redo = 1;
|
|
699
|
|
700 continue;
|
|
701 }
|
|
702
|
|
703 ctx->redo = 0;
|
|
704
|
|
705 if (ctx->flush == Z_SYNC_FLUSH) {
|
|
706
|
58
|
707 ctx->zstream.avail_out = 0;
|
|
708 ctx->out_buf->flush = 1;
|
50
|
709 ctx->flush = Z_NO_FLUSH;
|
|
710
|
|
711 cl = ngx_alloc_chain_link(r->pool);
|
|
712 if (cl == NULL) {
|
|
713 ngx_http_gzip_error(ctx);
|
|
714 return NGX_ERROR;
|
|
715 }
|
|
716
|
|
717 cl->buf = ctx->out_buf;
|
|
718 cl->next = NULL;
|
|
719 *ctx->last_out = cl;
|
|
720 ctx->last_out = &cl->next;
|
|
721
|
|
722 break;
|
|
723 }
|
|
724
|
|
725 if (rc == Z_STREAM_END) {
|
|
726
|
|
727 ctx->zin = ctx->zstream.total_in;
|
|
728 ctx->zout = 10 + ctx->zstream.total_out + 8;
|
|
729
|
|
730 rc = deflateEnd(&ctx->zstream);
|
|
731
|
|
732 if (rc != Z_OK) {
|
|
733 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
|
|
734 "deflateEnd() failed: %d", rc);
|
|
735 ngx_http_gzip_error(ctx);
|
|
736 return NGX_ERROR;
|
|
737 }
|
|
738
|
|
739 ngx_pfree(r->pool, ctx->preallocated);
|
|
740
|
|
741 cl = ngx_alloc_chain_link(r->pool);
|
|
742 if (cl == NULL) {
|
|
743 ngx_http_gzip_error(ctx);
|
|
744 return NGX_ERROR;
|
|
745 }
|
|
746
|
|
747 cl->buf = ctx->out_buf;
|
|
748 cl->next = NULL;
|
|
749 *ctx->last_out = cl;
|
|
750 ctx->last_out = &cl->next;
|
|
751
|
|
752 if (ctx->zstream.avail_out >= 8) {
|
|
753 trailer = (struct gztrailer *) ctx->out_buf->last;
|
|
754 ctx->out_buf->last += 8;
|
|
755 ctx->out_buf->last_buf = 1;
|
|
756
|
|
757 } else {
|
|
758 b = ngx_create_temp_buf(r->pool, 8);
|
|
759 if (b == NULL) {
|
|
760 ngx_http_gzip_error(ctx);
|
|
761 return NGX_ERROR;
|
|
762 }
|
|
763
|
|
764 b->last_buf = 1;
|
|
765
|
|
766 cl = ngx_alloc_chain_link(r->pool);
|
|
767 if (cl == NULL) {
|
|
768 ngx_http_gzip_error(ctx);
|
|
769 return NGX_ERROR;
|
|
770 }
|
|
771
|
|
772 cl->buf = b;
|
|
773 cl->next = NULL;
|
|
774 *ctx->last_out = cl;
|
|
775 ctx->last_out = &cl->next;
|
|
776 trailer = (struct gztrailer *) b->pos;
|
|
777 b->last += 8;
|
|
778 }
|
|
779
|
|
780 #if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)
|
|
781
|
|
782 trailer->crc32 = ctx->crc32;
|
|
783 trailer->zlen = ctx->zin;
|
|
784
|
|
785 #else
|
|
786 trailer->crc32[0] = (u_char) (ctx->crc32 & 0xff);
|
|
787 trailer->crc32[1] = (u_char) ((ctx->crc32 >> 8) & 0xff);
|
|
788 trailer->crc32[2] = (u_char) ((ctx->crc32 >> 16) & 0xff);
|
|
789 trailer->crc32[3] = (u_char) ((ctx->crc32 >> 24) & 0xff);
|
|
790
|
|
791 trailer->zlen[0] = (u_char) (ctx->zin & 0xff);
|
|
792 trailer->zlen[1] = (u_char) ((ctx->zin >> 8) & 0xff);
|
|
793 trailer->zlen[2] = (u_char) ((ctx->zin >> 16) & 0xff);
|
|
794 trailer->zlen[3] = (u_char) ((ctx->zin >> 24) & 0xff);
|
|
795 #endif
|
|
796
|
|
797 ctx->zstream.avail_in = 0;
|
|
798 ctx->zstream.avail_out = 0;
|
|
799
|
|
800 ctx->done = 1;
|
|
801
|
|
802 break;
|
|
803 }
|
|
804
|
|
805 if (conf->no_buffer && ctx->in == NULL) {
|
|
806
|
|
807 cl = ngx_alloc_chain_link(r->pool);
|
|
808 if (cl == NULL) {
|
|
809 ngx_http_gzip_error(ctx);
|
|
810 return NGX_ERROR;
|
|
811 }
|
|
812
|
|
813 cl->buf = ctx->out_buf;
|
|
814 cl->next = NULL;
|
|
815 *ctx->last_out = cl;
|
|
816 ctx->last_out = &cl->next;
|
|
817
|
|
818 break;
|
|
819 }
|
|
820 }
|
|
821
|
|
822 if (last == NGX_AGAIN && !ctx->done) {
|
|
823 return NGX_AGAIN;
|
|
824 }
|
|
825
|
|
826 if (ctx->out == NULL && ctx->busy == NULL) {
|
|
827 return NGX_OK;
|
|
828 }
|
|
829
|
|
830 last = ngx_http_next_body_filter(r, ctx->out);
|
|
831
|
|
832 /*
|
|
833 * we do not check NGX_AGAIN here because the downstream filters
|
|
834 * may free some buffers and zlib may compress some data into them
|
|
835 */
|
|
836
|
|
837 if (last == NGX_ERROR) {
|
|
838 ngx_http_gzip_error(ctx);
|
|
839 return NGX_ERROR;
|
|
840 }
|
|
841
|
|
842 ngx_chain_update_chains(&ctx->free, &ctx->busy, &ctx->out,
|
|
843 (ngx_buf_tag_t) &ngx_http_gzip_filter_module);
|
|
844 ctx->last_out = &ctx->out;
|
|
845
|
|
846 if (ctx->done) {
|
|
847 return last;
|
|
848 }
|
|
849 }
|
|
850 }
|
|
851
|
|
852
|
|
853 static void *
|
|
854 ngx_http_gzip_filter_alloc(void *opaque, u_int items, u_int size)
|
|
855 {
|
|
856 ngx_http_gzip_ctx_t *ctx = opaque;
|
|
857
|
|
858 void *p;
|
|
859 ngx_uint_t alloc;
|
|
860
|
|
861 alloc = items * size;
|
|
862
|
|
863 if (alloc % 512 != 0) {
|
|
864
|
|
865 /*
|
|
866 * The zlib deflate_state allocation, it takes about 6K,
|
|
867 * we allocate 8K. Other allocations are divisible by 512.
|
|
868 */
|
|
869
|
|
870 alloc = (alloc + ngx_pagesize - 1) & ~(ngx_pagesize - 1);
|
|
871 }
|
|
872
|
|
873 if (alloc <= ctx->allocated) {
|
|
874 p = ctx->free_mem;
|
|
875 ctx->free_mem += alloc;
|
|
876 ctx->allocated -= alloc;
|
|
877
|
|
878 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0,
|
|
879 "gzip alloc: n:%ud s:%ud a:%ud p:%p",
|
|
880 items, size, alloc, p);
|
|
881
|
|
882 return p;
|
|
883 }
|
|
884
|
|
885 ngx_log_error(NGX_LOG_ALERT, ctx->request->connection->log, 0,
|
|
886 "gzip filter failed to use preallocated memory: %ud of %ud",
|
|
887 items * size, ctx->allocated);
|
|
888
|
|
889 p = ngx_palloc(ctx->request->pool, items * size);
|
|
890
|
|
891 return p;
|
|
892 }
|
|
893
|
|
894
|
|
895 static void
|
|
896 ngx_http_gzip_filter_free(void *opaque, void *address)
|
|
897 {
|
|
898 #if 0
|
|
899 ngx_http_gzip_ctx_t *ctx = opaque;
|
|
900
|
|
901 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0,
|
|
902 "gzip free: %p", address);
|
|
903 #endif
|
|
904 }
|
|
905
|
|
906
|
|
907 static u_char *
|
|
908 ngx_http_gzip_log_ratio(ngx_http_request_t *r, u_char *buf,
|
|
909 ngx_http_log_op_t *op)
|
|
910 {
|
|
911 ngx_uint_t zint, zfrac;
|
|
912 ngx_http_gzip_ctx_t *ctx;
|
|
913
|
|
914 ctx = ngx_http_get_module_ctx(r, ngx_http_gzip_filter_module);
|
|
915
|
|
916 if (ctx == NULL || ctx->zout == 0) {
|
|
917 *buf = '-';
|
|
918 return buf + 1;
|
|
919 }
|
|
920
|
|
921 zint = (ngx_uint_t) (ctx->zin / ctx->zout);
|
|
922 zfrac = (ngx_uint_t) ((ctx->zin * 100 / ctx->zout) % 100);
|
|
923
|
|
924 if ((ctx->zin * 1000 / ctx->zout) % 10 > 4) {
|
|
925
|
|
926 /* the rounding, e.g., 2.125 to 2.13 */
|
|
927
|
|
928 zfrac++;
|
|
929
|
|
930 if (zfrac > 99) {
|
|
931 zint++;
|
|
932 zfrac = 0;
|
|
933 }
|
|
934 }
|
|
935
|
|
936 return ngx_sprintf(buf, "%ui.%02ui", zint, zfrac);
|
|
937 }
|
|
938
|
|
939
|
|
940 static void
|
|
941 ngx_http_gzip_error(ngx_http_gzip_ctx_t *ctx)
|
|
942 {
|
|
943 deflateEnd(&ctx->zstream);
|
|
944
|
|
945 if (ctx->preallocated) {
|
|
946 ngx_pfree(ctx->request->pool, ctx->preallocated);
|
|
947 }
|
|
948
|
|
949 ctx->zstream.avail_in = 0;
|
|
950 ctx->zstream.avail_out = 0;
|
|
951
|
|
952 ctx->done = 1;
|
|
953
|
|
954 return;
|
|
955 }
|
|
956
|
|
957
|
|
958 static ngx_int_t
|
|
959 ngx_http_gzip_add_log_formats(ngx_conf_t *cf)
|
|
960 {
|
|
961 ngx_http_log_op_name_t *op;
|
|
962
|
|
963 for (op = ngx_http_gzip_log_fmt_ops; op->name.len; op++) { /* void */ }
|
|
964 op->run = NULL;
|
|
965
|
|
966 for (op = ngx_http_log_fmt_ops; op->run; op++) {
|
|
967 if (op->name.len == 0) {
|
|
968 op = (ngx_http_log_op_name_t *) op->run;
|
|
969 }
|
|
970 }
|
|
971
|
|
972 op->run = (ngx_http_log_op_run_pt) ngx_http_gzip_log_fmt_ops;
|
|
973
|
|
974 return NGX_OK;
|
|
975 }
|
|
976
|
|
977
|
|
978 static ngx_int_t
|
|
979 ngx_http_gzip_filter_init(ngx_cycle_t *cycle)
|
|
980 {
|
|
981 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
982 ngx_http_top_header_filter = ngx_http_gzip_header_filter;
|
|
983
|
|
984 ngx_http_next_body_filter = ngx_http_top_body_filter;
|
|
985 ngx_http_top_body_filter = ngx_http_gzip_body_filter;
|
|
986
|
|
987 return NGX_OK;
|
|
988 }
|
|
989
|
|
990
|
|
991 static void *
|
|
992 ngx_http_gzip_create_conf(ngx_conf_t *cf)
|
|
993 {
|
|
994 ngx_http_gzip_conf_t *conf;
|
|
995
|
|
996 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_gzip_conf_t));
|
|
997 if (conf == NULL) {
|
|
998 return NGX_CONF_ERROR;
|
|
999 }
|
|
1000
|
|
1001 /*
|
|
1002 * set by ngx_pcalloc():
|
|
1003 *
|
|
1004 * conf->bufs.num = 0;
|
|
1005 * conf->proxied = 0;
|
|
1006 * conf->types = NULL;
|
|
1007 */
|
|
1008
|
|
1009 conf->enable = NGX_CONF_UNSET;
|
|
1010 conf->no_buffer = NGX_CONF_UNSET;
|
|
1011
|
|
1012 conf->http_version = NGX_CONF_UNSET_UINT;
|
|
1013
|
|
1014 conf->level = NGX_CONF_UNSET;
|
|
1015 conf->wbits = (size_t) NGX_CONF_UNSET;
|
|
1016 conf->memlevel = (size_t) NGX_CONF_UNSET;
|
|
1017 conf->min_length = NGX_CONF_UNSET;
|
|
1018
|
|
1019 return conf;
|
|
1020 }
|
|
1021
|
|
1022
|
|
1023 static char *
|
|
1024 ngx_http_gzip_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
1025 {
|
|
1026 ngx_http_gzip_conf_t *prev = parent;
|
|
1027 ngx_http_gzip_conf_t *conf = child;
|
|
1028
|
76
|
1029 ngx_str_t *type;
|
50
|
1030
|
|
1031 ngx_conf_merge_value(conf->enable, prev->enable, 0);
|
|
1032
|
|
1033 ngx_conf_merge_bufs_value(conf->bufs, prev->bufs, 4, ngx_pagesize);
|
|
1034
|
|
1035 ngx_conf_merge_unsigned_value(conf->http_version, prev->http_version,
|
|
1036 NGX_HTTP_VERSION_11);
|
|
1037 ngx_conf_merge_bitmask_value(conf->proxied, prev->proxied,
|
|
1038 (NGX_CONF_BITMASK_SET|NGX_HTTP_GZIP_PROXIED_OFF));
|
|
1039
|
|
1040 ngx_conf_merge_value(conf->level, prev->level, 1);
|
|
1041 ngx_conf_merge_size_value(conf->wbits, prev->wbits, MAX_WBITS);
|
|
1042 ngx_conf_merge_size_value(conf->memlevel, prev->memlevel,
|
|
1043 MAX_MEM_LEVEL - 1);
|
|
1044 ngx_conf_merge_value(conf->min_length, prev->min_length, 0);
|
|
1045 ngx_conf_merge_value(conf->no_buffer, prev->no_buffer, 0);
|
|
1046
|
|
1047 if (conf->types == NULL) {
|
|
1048 if (prev->types == NULL) {
|
76
|
1049 conf->types = ngx_array_create(cf->pool, 1, sizeof(ngx_str_t));
|
50
|
1050 if (conf->types == NULL) {
|
|
1051 return NGX_CONF_ERROR;
|
|
1052 }
|
|
1053
|
|
1054 type = ngx_array_push(conf->types);
|
|
1055 if (type == NULL) {
|
|
1056 return NGX_CONF_ERROR;
|
|
1057 }
|
|
1058
|
76
|
1059 type->len = sizeof("text/html") - 1;
|
|
1060 type->data = (u_char *) "text/html";
|
50
|
1061
|
|
1062 } else {
|
|
1063 conf->types = prev->types;
|
|
1064 }
|
|
1065 }
|
|
1066
|
|
1067 return NGX_CONF_OK;
|
|
1068 }
|
|
1069
|
|
1070
|
|
1071 static char *
|
76
|
1072 ngx_http_gzip_types(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
50
|
1073 {
|
|
1074 ngx_http_gzip_conf_t *gcf = conf;
|
|
1075
|
76
|
1076 ngx_str_t *value, *type;
|
|
1077 ngx_uint_t i;
|
50
|
1078
|
|
1079 if (gcf->types == NULL) {
|
76
|
1080 gcf->types = ngx_array_create(cf->pool, 4, sizeof(ngx_str_t));
|
50
|
1081 if (gcf->types == NULL) {
|
|
1082 return NGX_CONF_ERROR;
|
|
1083 }
|
|
1084
|
|
1085 type = ngx_array_push(gcf->types);
|
|
1086 if (type == NULL) {
|
|
1087 return NGX_CONF_ERROR;
|
|
1088 }
|
|
1089
|
76
|
1090 type->len = sizeof("text/html") - 1;
|
|
1091 type->data = (u_char *) "text/html";
|
50
|
1092 }
|
|
1093
|
|
1094 value = cf->args->elts;
|
|
1095
|
|
1096 for (i = 1; i < cf->args->nelts; i++) {
|
|
1097
|
|
1098 if (ngx_strcmp(value[i].data, "text/html") == 0) {
|
|
1099 continue;
|
|
1100 }
|
|
1101
|
|
1102 type = ngx_array_push(gcf->types);
|
|
1103 if (type == NULL) {
|
|
1104 return NGX_CONF_ERROR;
|
|
1105 }
|
|
1106
|
76
|
1107 type->len = value[i].len;
|
50
|
1108
|
76
|
1109 type->data = ngx_palloc(cf->pool, type->len + 1);
|
|
1110 if (type->data == NULL) {
|
50
|
1111 return NGX_CONF_ERROR;
|
|
1112 }
|
|
1113
|
76
|
1114 ngx_cpystrn(type->data, value[i].data, type->len + 1);
|
50
|
1115 }
|
|
1116
|
|
1117 return NGX_CONF_OK;
|
|
1118 }
|
|
1119
|
|
1120
|
|
1121 static char *
|
76
|
1122 ngx_http_gzip_window(ngx_conf_t *cf, void *post, void *data)
|
50
|
1123 {
|
|
1124 int *np = data;
|
|
1125
|
|
1126 int wbits, wsize;
|
|
1127
|
|
1128 wbits = 15;
|
|
1129
|
|
1130 for (wsize = 32 * 1024; wsize > 256; wsize >>= 1) {
|
|
1131
|
|
1132 if (wsize == *np) {
|
|
1133 *np = wbits;
|
|
1134
|
|
1135 return NGX_CONF_OK;
|
|
1136 }
|
|
1137
|
|
1138 wbits--;
|
|
1139 }
|
|
1140
|
|
1141 return "must be 512, 1k, 2k, 4k, 8k, 16k, or 32k";
|
|
1142 }
|
|
1143
|
|
1144
|
|
1145 static char *
|
76
|
1146 ngx_http_gzip_hash(ngx_conf_t *cf, void *post, void *data)
|
50
|
1147 {
|
|
1148 int *np = data;
|
|
1149
|
|
1150 int memlevel, hsize;
|
|
1151
|
|
1152 memlevel = 9;
|
|
1153
|
|
1154 for (hsize = 128 * 1024; hsize > 256; hsize >>= 1) {
|
|
1155
|
|
1156 if (hsize == *np) {
|
|
1157 *np = memlevel;
|
|
1158
|
|
1159 return NGX_CONF_OK;
|
|
1160 }
|
|
1161
|
|
1162 memlevel--;
|
|
1163 }
|
|
1164
|
|
1165 return "must be 512, 1k, 2k, 4k, 8k, 16k, 32k, 64k, or 128k";
|
|
1166 }
|