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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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50
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19
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20 ngx_bufs_t bufs;
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21
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138
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22 ngx_int_t level;
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23 size_t wbits;
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24 size_t memlevel;
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25 ssize_t min_length;
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26 } ngx_http_gzip_conf_t;
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27
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28
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29 typedef struct {
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30 ngx_chain_t *in;
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31 ngx_chain_t *free;
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32 ngx_chain_t *busy;
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33 ngx_chain_t *out;
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34 ngx_chain_t **last_out;
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35 ngx_buf_t *in_buf;
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36 ngx_buf_t *out_buf;
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37 ngx_int_t bufs;
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38
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39 off_t length;
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40
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41 void *preallocated;
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42 char *free_mem;
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43 ngx_uint_t allocated;
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44
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45 unsigned flush:4;
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46 unsigned redo:1;
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47 unsigned done:1;
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48
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49 size_t zin;
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50 size_t zout;
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51
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52 uint32_t crc32;
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53 z_stream zstream;
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54 ngx_http_request_t *request;
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55 } ngx_http_gzip_ctx_t;
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56
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57
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58 static void *ngx_http_gzip_filter_alloc(void *opaque, u_int items,
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59 u_int size);
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60 static void ngx_http_gzip_filter_free(void *opaque, void *address);
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61 static void ngx_http_gzip_error(ngx_http_gzip_ctx_t *ctx);
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62
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122
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63 static ngx_int_t ngx_http_gzip_add_variables(ngx_conf_t *cf);
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64 static ngx_int_t ngx_http_gzip_ratio_variable(ngx_http_request_t *r,
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65 ngx_http_variable_value_t *v, uintptr_t data);
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66
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230
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67 static ngx_int_t ngx_http_gzip_filter_init(ngx_conf_t *cf);
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68 static void *ngx_http_gzip_create_conf(ngx_conf_t *cf);
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69 static char *ngx_http_gzip_merge_conf(ngx_conf_t *cf,
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70 void *parent, void *child);
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76
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71 static char *ngx_http_gzip_types(ngx_conf_t *cf, ngx_command_t *cmd,
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72 void *conf);
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76
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73 static char *ngx_http_gzip_window(ngx_conf_t *cf, void *post, void *data);
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74 static char *ngx_http_gzip_hash(ngx_conf_t *cf, void *post, void *data);
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75
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76
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77 static ngx_conf_num_bounds_t ngx_http_gzip_comp_level_bounds = {
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78 ngx_conf_check_num_bounds, 1, 9
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79 };
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80
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76
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81 static ngx_conf_post_handler_pt ngx_http_gzip_window_p = ngx_http_gzip_window;
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82 static ngx_conf_post_handler_pt ngx_http_gzip_hash_p = ngx_http_gzip_hash;
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83
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84
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85 static ngx_command_t ngx_http_gzip_filter_commands[] = {
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86
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87 { ngx_string("gzip"),
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88 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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89 |NGX_CONF_FLAG,
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90 ngx_conf_set_flag_slot,
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91 NGX_HTTP_LOC_CONF_OFFSET,
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92 offsetof(ngx_http_gzip_conf_t, enable),
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93 NULL },
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94
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95 { ngx_string("gzip_buffers"),
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96 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
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97 ngx_conf_set_bufs_slot,
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98 NGX_HTTP_LOC_CONF_OFFSET,
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99 offsetof(ngx_http_gzip_conf_t, bufs),
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100 NULL },
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101
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102 { ngx_string("gzip_types"),
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103 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
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104 ngx_http_gzip_types,
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50
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105 NGX_HTTP_LOC_CONF_OFFSET,
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106 0,
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107 NULL },
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108
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109 { ngx_string("gzip_comp_level"),
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110 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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111 ngx_conf_set_num_slot,
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112 NGX_HTTP_LOC_CONF_OFFSET,
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113 offsetof(ngx_http_gzip_conf_t, level),
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114 &ngx_http_gzip_comp_level_bounds },
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115
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116 { ngx_string("gzip_window"),
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117 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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118 ngx_conf_set_size_slot,
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119 NGX_HTTP_LOC_CONF_OFFSET,
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120 offsetof(ngx_http_gzip_conf_t, wbits),
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121 &ngx_http_gzip_window_p },
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122
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123 { ngx_string("gzip_hash"),
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124 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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125 ngx_conf_set_size_slot,
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126 NGX_HTTP_LOC_CONF_OFFSET,
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127 offsetof(ngx_http_gzip_conf_t, memlevel),
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128 &ngx_http_gzip_hash_p },
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129
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130 { ngx_string("gzip_no_buffer"),
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131 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
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132 ngx_conf_set_flag_slot,
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133 NGX_HTTP_LOC_CONF_OFFSET,
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134 offsetof(ngx_http_gzip_conf_t, no_buffer),
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135 NULL },
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136
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137 { ngx_string("gzip_min_length"),
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138 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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139 ngx_conf_set_size_slot,
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140 NGX_HTTP_LOC_CONF_OFFSET,
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141 offsetof(ngx_http_gzip_conf_t, min_length),
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142 NULL },
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143
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144 ngx_null_command
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145 };
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146
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147
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148 static ngx_http_module_t ngx_http_gzip_filter_module_ctx = {
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122
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149 ngx_http_gzip_add_variables, /* preconfiguration */
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230
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150 ngx_http_gzip_filter_init, /* postconfiguration */
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151
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152 NULL, /* create main configuration */
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153 NULL, /* init main configuration */
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154
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155 NULL, /* create server configuration */
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156 NULL, /* merge server configuration */
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157
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158 ngx_http_gzip_create_conf, /* create location configuration */
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159 ngx_http_gzip_merge_conf /* merge location configuration */
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160 };
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161
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162
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163 ngx_module_t ngx_http_gzip_filter_module = {
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58
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164 NGX_MODULE_V1,
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165 &ngx_http_gzip_filter_module_ctx, /* module context */
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166 ngx_http_gzip_filter_commands, /* module directives */
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167 NGX_HTTP_MODULE, /* module type */
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90
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168 NULL, /* init master */
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230
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169 NULL, /* init module */
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90
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170 NULL, /* init process */
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171 NULL, /* init thread */
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172 NULL, /* exit thread */
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173 NULL, /* exit process */
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174 NULL, /* exit master */
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175 NGX_MODULE_V1_PADDING
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50
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176 };
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177
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178
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179 static u_char gzheader[10] = { 0x1f, 0x8b, Z_DEFLATED, 0, 0, 0, 0, 0, 0, 3 };
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180
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181 #if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)
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182
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183 struct gztrailer {
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184 uint32_t crc32;
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185 uint32_t zlen;
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186 };
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187
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188 #else /* NGX_HAVE_BIG_ENDIAN || !NGX_HAVE_NONALIGNED */
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189
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190 struct gztrailer {
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191 u_char crc32[4];
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192 u_char zlen[4];
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193 };
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194
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195 #endif
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196
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197
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122
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198 static ngx_str_t ngx_http_gzip_ratio = ngx_string("gzip_ratio");
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58
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199
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200 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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201 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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202
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203
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204 static ngx_int_t
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205 ngx_http_gzip_header_filter(ngx_http_request_t *r)
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206 {
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358
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207 ngx_str_t *type;
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208 ngx_uint_t i;
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209 ngx_table_elt_t *h;
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210 ngx_http_gzip_ctx_t *ctx;
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211 ngx_http_gzip_conf_t *conf;
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212 ngx_http_core_loc_conf_t *clcf;
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213
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214 conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module);
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215
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216 if (!conf->enable
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217 || (r->headers_out.status != NGX_HTTP_OK
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218 && r->headers_out.status != NGX_HTTP_FORBIDDEN
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219 && r->headers_out.status != NGX_HTTP_NOT_FOUND)
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220 || r->header_only
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221 || r->headers_out.content_type.len == 0
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222 || (r->headers_out.content_encoding
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223 && r->headers_out.content_encoding->value.len)
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224 || (r->headers_out.content_length_n != -1
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225 && r->headers_out.content_length_n < conf->min_length)
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358
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226 || ngx_http_gzip_ok(r) != NGX_OK)
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227 {
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228 return ngx_http_next_header_filter(r);
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229 }
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230
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231 type = conf->types->elts;
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232 for (i = 0; i < conf->types->nelts; i++) {
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233 if (r->headers_out.content_type.len >= type[i].len
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234 && ngx_strncasecmp(r->headers_out.content_type.data,
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235 type[i].data, type[i].len) == 0)
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236 {
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237 goto found;
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238 }
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239 }
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240
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241 return ngx_http_next_header_filter(r);
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242
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243 found:
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244
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245 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_gzip_ctx_t));
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246 if (ctx == NULL) {
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247 return NGX_ERROR;
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248 }
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249
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250 ngx_http_set_ctx(r, ctx, ngx_http_gzip_filter_module);
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251
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252 ctx->request = r;
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253
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358
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254 h = ngx_list_push(&r->headers_out.headers);
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255 if (h == NULL) {
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256 return NGX_ERROR;
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257 }
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258
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358
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259 h->hash = 1;
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260 h->key.len = sizeof("Content-Encoding") - 1;
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261 h->key.data = (u_char *) "Content-Encoding";
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262 h->value.len = sizeof("gzip") - 1;
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263 h->value.data = (u_char *) "gzip";
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342
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264
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358
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265 r->headers_out.content_encoding = h;
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266
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267 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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342
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268
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358
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269 if (clcf->gzip_vary) {
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270 h = ngx_list_push(&r->headers_out.headers);
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271 if (h == NULL) {
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342
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272 return NGX_ERROR;
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273 }
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274
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358
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275 h->hash = 1;
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276 h->key.len = sizeof("Vary") - 1;
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277 h->key.data = (u_char *) "Vary";
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278 h->value.len = sizeof("Accept-Encoding") - 1;
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279 h->value.data = (u_char *) "Accept-Encoding";
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342
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280 }
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281
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282 ctx->length = r->headers_out.content_length_n;
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283
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284 r->main_filter_need_in_memory = 1;
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285
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126
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286 ngx_http_clear_content_length(r);
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287 ngx_http_clear_accept_ranges(r);
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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 static ngx_int_t
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294 ngx_http_gzip_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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295 {
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296 int rc, wbits, memlevel;
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297 ngx_int_t last;
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298 struct gztrailer *trailer;
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299 ngx_buf_t *b;
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300 ngx_chain_t *cl, out;
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301 ngx_http_gzip_ctx_t *ctx;
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302 ngx_http_gzip_conf_t *conf;
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303
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304 ctx = ngx_http_get_module_ctx(r, ngx_http_gzip_filter_module);
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305
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306 if (ctx == NULL || ctx->done) {
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307 return ngx_http_next_body_filter(r, in);
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308 }
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309
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310 conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module);
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311
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312 if (ctx->preallocated == NULL) {
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313 wbits = conf->wbits;
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314 memlevel = conf->memlevel;
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315
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316 if (ctx->length > 0) {
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317
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318 /* the actual zlib window size is smaller by 262 bytes */
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319
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320 while (ctx->length < ((1 << (wbits - 1)) - 262)) {
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321 wbits--;
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322 memlevel--;
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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 * We preallocate a memory for zlib in one buffer (200K-400K), this
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328 * decreases a number of malloc() and free() calls and also probably
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329 * decreases a number of syscalls (sbrk() and so on).
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330 * Besides we free this memory as soon as the gzipping will complete
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331 * and do not wait while a whole response will be sent to a client.
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332 *
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333 * 8K is for zlib deflate_state, it takes
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58
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334 * *) 5816 bytes on i386 and sparc64 (32-bit mode)
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335 * *) 5920 bytes on amd64 and sparc64
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50
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336 */
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337
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338 ctx->allocated = 8192 + (1 << (wbits + 2)) + (1 << (memlevel + 9));
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339
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340 ctx->preallocated = ngx_palloc(r->pool, ctx->allocated);
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341 if (ctx->preallocated == NULL) {
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342 return NGX_ERROR;
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343 }
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344
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345 ctx->free_mem = ctx->preallocated;
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346
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347 ctx->zstream.zalloc = ngx_http_gzip_filter_alloc;
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348 ctx->zstream.zfree = ngx_http_gzip_filter_free;
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349 ctx->zstream.opaque = ctx;
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350
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138
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351 rc = deflateInit2(&ctx->zstream, (int) conf->level, Z_DEFLATED,
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50
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352 -wbits, memlevel, Z_DEFAULT_STRATEGY);
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353
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354 if (rc != Z_OK) {
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355 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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356 "deflateInit2() failed: %d", rc);
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357 ngx_http_gzip_error(ctx);
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358 return NGX_ERROR;
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359 }
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360
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361 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
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362 if (b == NULL) {
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363 ngx_http_gzip_error(ctx);
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364 return NGX_ERROR;
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365 }
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366
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367 b->memory = 1;
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368 b->pos = gzheader;
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369 b->last = b->pos + 10;
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370
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371 out.buf = b;
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372 out.next = NULL;
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373
|
|
|
374 /*
|
|
|
375 * We pass the gzheader to the next filter now to avoid its linking
|
|
|
376 * to the ctx->busy chain. zlib does not usually output the compressed
|
|
|
377 * data in the initial iterations, so the gzheader that was linked
|
|
|
378 * to the ctx->busy chain would be flushed by ngx_http_write_filter().
|
|
|
379 */
|
|
|
380
|
|
|
381 if (ngx_http_next_body_filter(r, &out) == NGX_ERROR) {
|
|
|
382 ngx_http_gzip_error(ctx);
|
|
|
383 return NGX_ERROR;
|
|
|
384 }
|
|
|
385
|
|
146
|
386 r->connection->buffered |= NGX_HTTP_GZIP_BUFFERED;
|
|
|
387
|
|
50
|
388 ctx->last_out = &ctx->out;
|
|
|
389
|
|
|
390 ctx->crc32 = crc32(0L, Z_NULL, 0);
|
|
|
391 ctx->flush = Z_NO_FLUSH;
|
|
|
392 }
|
|
|
393
|
|
|
394 if (in) {
|
|
|
395 if (ngx_chain_add_copy(r->pool, &ctx->in, in) == NGX_ERROR) {
|
|
|
396 ngx_http_gzip_error(ctx);
|
|
|
397 return NGX_ERROR;
|
|
|
398 }
|
|
|
399 }
|
|
|
400
|
|
|
401 last = NGX_NONE;
|
|
|
402
|
|
|
403 for ( ;; ) {
|
|
|
404
|
|
|
405 for ( ;; ) {
|
|
|
406
|
|
|
407 /* does zlib need a new data ? */
|
|
|
408
|
|
|
409 if (ctx->zstream.avail_in == 0
|
|
|
410 && ctx->flush == Z_NO_FLUSH
|
|
|
411 && !ctx->redo)
|
|
|
412 {
|
|
|
413 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
414 "gzip in: %p", ctx->in);
|
|
|
415
|
|
|
416 if (ctx->in == NULL) {
|
|
|
417 break;
|
|
|
418 }
|
|
|
419
|
|
|
420 ctx->in_buf = ctx->in->buf;
|
|
|
421 ctx->in = ctx->in->next;
|
|
|
422
|
|
|
423 ctx->zstream.next_in = ctx->in_buf->pos;
|
|
|
424 ctx->zstream.avail_in = ctx->in_buf->last - ctx->in_buf->pos;
|
|
|
425
|
|
|
426 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
427 "gzip in_buf:%p ni:%p ai:%ud",
|
|
|
428 ctx->in_buf,
|
|
|
429 ctx->zstream.next_in, ctx->zstream.avail_in);
|
|
|
430
|
|
|
431 /* STUB */
|
|
|
432 if (ctx->in_buf->last < ctx->in_buf->pos) {
|
|
|
433 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
|
|
|
434 "zstream.avail_in is huge");
|
|
|
435 ctx->done = 1;
|
|
|
436 return NGX_ERROR;
|
|
|
437 }
|
|
|
438 /**/
|
|
|
439
|
|
|
440 if (ctx->in_buf->last_buf) {
|
|
|
441 ctx->flush = Z_FINISH;
|
|
|
442
|
|
|
443 } else if (ctx->in_buf->flush) {
|
|
|
444 ctx->flush = Z_SYNC_FLUSH;
|
|
|
445 }
|
|
|
446
|
|
|
447 if (ctx->zstream.avail_in == 0) {
|
|
|
448 if (ctx->flush == Z_NO_FLUSH) {
|
|
|
449 continue;
|
|
|
450 }
|
|
|
451
|
|
|
452 } else {
|
|
|
453 ctx->crc32 = crc32(ctx->crc32, ctx->zstream.next_in,
|
|
|
454 ctx->zstream.avail_in);
|
|
|
455 }
|
|
|
456 }
|
|
|
457
|
|
|
458
|
|
|
459 /* is there a space for the gzipped data ? */
|
|
|
460
|
|
|
461 if (ctx->zstream.avail_out == 0) {
|
|
|
462
|
|
|
463 if (ctx->free) {
|
|
|
464 ctx->out_buf = ctx->free->buf;
|
|
|
465 ctx->free = ctx->free->next;
|
|
|
466
|
|
|
467 } else if (ctx->bufs < conf->bufs.num) {
|
|
|
468 ctx->out_buf = ngx_create_temp_buf(r->pool,
|
|
|
469 conf->bufs.size);
|
|
|
470 if (ctx->out_buf == NULL) {
|
|
|
471 ngx_http_gzip_error(ctx);
|
|
|
472 return NGX_ERROR;
|
|
|
473 }
|
|
|
474
|
|
|
475 ctx->out_buf->tag = (ngx_buf_tag_t)
|
|
|
476 &ngx_http_gzip_filter_module;
|
|
|
477 ctx->out_buf->recycled = 1;
|
|
|
478 ctx->bufs++;
|
|
|
479
|
|
|
480 } else {
|
|
|
481 break;
|
|
|
482 }
|
|
|
483
|
|
|
484 ctx->zstream.next_out = ctx->out_buf->pos;
|
|
|
485 ctx->zstream.avail_out = conf->bufs.size;
|
|
|
486 }
|
|
|
487
|
|
|
488 ngx_log_debug6(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
489 "deflate in: ni:%p no:%p ai:%ud ao:%ud fl:%d redo:%d",
|
|
|
490 ctx->zstream.next_in, ctx->zstream.next_out,
|
|
|
491 ctx->zstream.avail_in, ctx->zstream.avail_out,
|
|
|
492 ctx->flush, ctx->redo);
|
|
|
493
|
|
|
494 rc = deflate(&ctx->zstream, ctx->flush);
|
|
|
495
|
|
|
496 if (rc != Z_OK && rc != Z_STREAM_END) {
|
|
|
497 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
|
|
|
498 "deflate() failed: %d, %d", ctx->flush, rc);
|
|
|
499 ngx_http_gzip_error(ctx);
|
|
|
500 return NGX_ERROR;
|
|
|
501 }
|
|
|
502
|
|
|
503 ngx_log_debug5(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
504 "deflate out: ni:%p no:%p ai:%ud ao:%ud rc:%d",
|
|
|
505 ctx->zstream.next_in, ctx->zstream.next_out,
|
|
|
506 ctx->zstream.avail_in, ctx->zstream.avail_out,
|
|
|
507 rc);
|
|
|
508
|
|
|
509 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
510 "gzip in_buf:%p pos:%p",
|
|
|
511 ctx->in_buf, ctx->in_buf->pos);
|
|
|
512
|
|
|
513
|
|
|
514 if (ctx->zstream.next_in) {
|
|
|
515 ctx->in_buf->pos = ctx->zstream.next_in;
|
|
|
516
|
|
|
517 if (ctx->zstream.avail_in == 0) {
|
|
|
518 ctx->zstream.next_in = NULL;
|
|
|
519 }
|
|
|
520 }
|
|
|
521
|
|
|
522 ctx->out_buf->last = ctx->zstream.next_out;
|
|
|
523
|
|
|
524 if (ctx->zstream.avail_out == 0) {
|
|
|
525
|
|
|
526 /* zlib wants to output some more gzipped data */
|
|
|
527
|
|
|
528 cl = ngx_alloc_chain_link(r->pool);
|
|
|
529 if (cl == NULL) {
|
|
|
530 ngx_http_gzip_error(ctx);
|
|
|
531 return NGX_ERROR;
|
|
|
532 }
|
|
|
533
|
|
|
534 cl->buf = ctx->out_buf;
|
|
|
535 cl->next = NULL;
|
|
|
536 *ctx->last_out = cl;
|
|
|
537 ctx->last_out = &cl->next;
|
|
|
538
|
|
|
539 ctx->redo = 1;
|
|
|
540
|
|
|
541 continue;
|
|
|
542 }
|
|
|
543
|
|
|
544 ctx->redo = 0;
|
|
|
545
|
|
|
546 if (ctx->flush == Z_SYNC_FLUSH) {
|
|
|
547
|
|
58
|
548 ctx->zstream.avail_out = 0;
|
|
|
549 ctx->out_buf->flush = 1;
|
|
50
|
550 ctx->flush = Z_NO_FLUSH;
|
|
|
551
|
|
|
552 cl = ngx_alloc_chain_link(r->pool);
|
|
|
553 if (cl == NULL) {
|
|
|
554 ngx_http_gzip_error(ctx);
|
|
|
555 return NGX_ERROR;
|
|
|
556 }
|
|
|
557
|
|
|
558 cl->buf = ctx->out_buf;
|
|
|
559 cl->next = NULL;
|
|
|
560 *ctx->last_out = cl;
|
|
|
561 ctx->last_out = &cl->next;
|
|
|
562
|
|
|
563 break;
|
|
|
564 }
|
|
|
565
|
|
|
566 if (rc == Z_STREAM_END) {
|
|
|
567
|
|
|
568 ctx->zin = ctx->zstream.total_in;
|
|
|
569 ctx->zout = 10 + ctx->zstream.total_out + 8;
|
|
|
570
|
|
|
571 rc = deflateEnd(&ctx->zstream);
|
|
|
572
|
|
|
573 if (rc != Z_OK) {
|
|
|
574 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
|
|
|
575 "deflateEnd() failed: %d", rc);
|
|
|
576 ngx_http_gzip_error(ctx);
|
|
|
577 return NGX_ERROR;
|
|
|
578 }
|
|
|
579
|
|
|
580 ngx_pfree(r->pool, ctx->preallocated);
|
|
|
581
|
|
|
582 cl = ngx_alloc_chain_link(r->pool);
|
|
|
583 if (cl == NULL) {
|
|
|
584 ngx_http_gzip_error(ctx);
|
|
|
585 return NGX_ERROR;
|
|
|
586 }
|
|
|
587
|
|
|
588 cl->buf = ctx->out_buf;
|
|
|
589 cl->next = NULL;
|
|
|
590 *ctx->last_out = cl;
|
|
|
591 ctx->last_out = &cl->next;
|
|
|
592
|
|
|
593 if (ctx->zstream.avail_out >= 8) {
|
|
|
594 trailer = (struct gztrailer *) ctx->out_buf->last;
|
|
|
595 ctx->out_buf->last += 8;
|
|
|
596 ctx->out_buf->last_buf = 1;
|
|
|
597
|
|
|
598 } else {
|
|
|
599 b = ngx_create_temp_buf(r->pool, 8);
|
|
|
600 if (b == NULL) {
|
|
|
601 ngx_http_gzip_error(ctx);
|
|
|
602 return NGX_ERROR;
|
|
|
603 }
|
|
|
604
|
|
|
605 b->last_buf = 1;
|
|
|
606
|
|
|
607 cl = ngx_alloc_chain_link(r->pool);
|
|
|
608 if (cl == NULL) {
|
|
|
609 ngx_http_gzip_error(ctx);
|
|
|
610 return NGX_ERROR;
|
|
|
611 }
|
|
|
612
|
|
|
613 cl->buf = b;
|
|
|
614 cl->next = NULL;
|
|
|
615 *ctx->last_out = cl;
|
|
|
616 ctx->last_out = &cl->next;
|
|
|
617 trailer = (struct gztrailer *) b->pos;
|
|
|
618 b->last += 8;
|
|
|
619 }
|
|
|
620
|
|
|
621 #if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)
|
|
|
622
|
|
|
623 trailer->crc32 = ctx->crc32;
|
|
|
624 trailer->zlen = ctx->zin;
|
|
|
625
|
|
|
626 #else
|
|
|
627 trailer->crc32[0] = (u_char) (ctx->crc32 & 0xff);
|
|
|
628 trailer->crc32[1] = (u_char) ((ctx->crc32 >> 8) & 0xff);
|
|
|
629 trailer->crc32[2] = (u_char) ((ctx->crc32 >> 16) & 0xff);
|
|
|
630 trailer->crc32[3] = (u_char) ((ctx->crc32 >> 24) & 0xff);
|
|
|
631
|
|
|
632 trailer->zlen[0] = (u_char) (ctx->zin & 0xff);
|
|
|
633 trailer->zlen[1] = (u_char) ((ctx->zin >> 8) & 0xff);
|
|
|
634 trailer->zlen[2] = (u_char) ((ctx->zin >> 16) & 0xff);
|
|
|
635 trailer->zlen[3] = (u_char) ((ctx->zin >> 24) & 0xff);
|
|
|
636 #endif
|
|
|
637
|
|
|
638 ctx->zstream.avail_in = 0;
|
|
|
639 ctx->zstream.avail_out = 0;
|
|
|
640
|
|
|
641 ctx->done = 1;
|
|
|
642
|
|
146
|
643 r->connection->buffered &= ~NGX_HTTP_GZIP_BUFFERED;
|
|
|
644
|
|
50
|
645 break;
|
|
|
646 }
|
|
|
647
|
|
|
648 if (conf->no_buffer && ctx->in == NULL) {
|
|
|
649
|
|
|
650 cl = ngx_alloc_chain_link(r->pool);
|
|
|
651 if (cl == NULL) {
|
|
|
652 ngx_http_gzip_error(ctx);
|
|
|
653 return NGX_ERROR;
|
|
|
654 }
|
|
|
655
|
|
|
656 cl->buf = ctx->out_buf;
|
|
|
657 cl->next = NULL;
|
|
|
658 *ctx->last_out = cl;
|
|
|
659 ctx->last_out = &cl->next;
|
|
|
660
|
|
|
661 break;
|
|
|
662 }
|
|
|
663 }
|
|
|
664
|
|
346
|
665 if (ctx->out == NULL) {
|
|
50
|
666
|
|
346
|
667 if (last == NGX_AGAIN) {
|
|
|
668 return NGX_AGAIN;
|
|
|
669 }
|
|
|
670
|
|
|
671 if (ctx->busy == NULL) {
|
|
|
672 return NGX_OK;
|
|
|
673 }
|
|
50
|
674 }
|
|
|
675
|
|
|
676 last = ngx_http_next_body_filter(r, ctx->out);
|
|
|
677
|
|
|
678 /*
|
|
|
679 * we do not check NGX_AGAIN here because the downstream filters
|
|
|
680 * may free some buffers and zlib may compress some data into them
|
|
|
681 */
|
|
|
682
|
|
|
683 if (last == NGX_ERROR) {
|
|
|
684 ngx_http_gzip_error(ctx);
|
|
|
685 return NGX_ERROR;
|
|
|
686 }
|
|
|
687
|
|
|
688 ngx_chain_update_chains(&ctx->free, &ctx->busy, &ctx->out,
|
|
|
689 (ngx_buf_tag_t) &ngx_http_gzip_filter_module);
|
|
|
690 ctx->last_out = &ctx->out;
|
|
|
691
|
|
|
692 if (ctx->done) {
|
|
|
693 return last;
|
|
|
694 }
|
|
|
695 }
|
|
|
696 }
|
|
|
697
|
|
|
698
|
|
|
699 static void *
|
|
|
700 ngx_http_gzip_filter_alloc(void *opaque, u_int items, u_int size)
|
|
|
701 {
|
|
|
702 ngx_http_gzip_ctx_t *ctx = opaque;
|
|
|
703
|
|
|
704 void *p;
|
|
|
705 ngx_uint_t alloc;
|
|
|
706
|
|
|
707 alloc = items * size;
|
|
|
708
|
|
|
709 if (alloc % 512 != 0) {
|
|
|
710
|
|
|
711 /*
|
|
|
712 * The zlib deflate_state allocation, it takes about 6K,
|
|
|
713 * we allocate 8K. Other allocations are divisible by 512.
|
|
|
714 */
|
|
|
715
|
|
|
716 alloc = (alloc + ngx_pagesize - 1) & ~(ngx_pagesize - 1);
|
|
|
717 }
|
|
|
718
|
|
|
719 if (alloc <= ctx->allocated) {
|
|
|
720 p = ctx->free_mem;
|
|
|
721 ctx->free_mem += alloc;
|
|
|
722 ctx->allocated -= alloc;
|
|
|
723
|
|
|
724 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0,
|
|
|
725 "gzip alloc: n:%ud s:%ud a:%ud p:%p",
|
|
|
726 items, size, alloc, p);
|
|
|
727
|
|
|
728 return p;
|
|
|
729 }
|
|
|
730
|
|
|
731 ngx_log_error(NGX_LOG_ALERT, ctx->request->connection->log, 0,
|
|
|
732 "gzip filter failed to use preallocated memory: %ud of %ud",
|
|
|
733 items * size, ctx->allocated);
|
|
|
734
|
|
|
735 p = ngx_palloc(ctx->request->pool, items * size);
|
|
|
736
|
|
|
737 return p;
|
|
|
738 }
|
|
|
739
|
|
|
740
|
|
|
741 static void
|
|
|
742 ngx_http_gzip_filter_free(void *opaque, void *address)
|
|
|
743 {
|
|
|
744 #if 0
|
|
|
745 ngx_http_gzip_ctx_t *ctx = opaque;
|
|
|
746
|
|
|
747 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0,
|
|
|
748 "gzip free: %p", address);
|
|
|
749 #endif
|
|
|
750 }
|
|
|
751
|
|
|
752
|
|
|
753 static void
|
|
|
754 ngx_http_gzip_error(ngx_http_gzip_ctx_t *ctx)
|
|
|
755 {
|
|
|
756 deflateEnd(&ctx->zstream);
|
|
|
757
|
|
|
758 if (ctx->preallocated) {
|
|
|
759 ngx_pfree(ctx->request->pool, ctx->preallocated);
|
|
|
760 }
|
|
|
761
|
|
|
762 ctx->zstream.avail_in = 0;
|
|
|
763 ctx->zstream.avail_out = 0;
|
|
|
764
|
|
|
765 ctx->done = 1;
|
|
|
766
|
|
|
767 return;
|
|
|
768 }
|
|
|
769
|
|
|
770
|
|
|
771 static ngx_int_t
|
|
122
|
772 ngx_http_gzip_add_variables(ngx_conf_t *cf)
|
|
50
|
773 {
|
|
260
|
774 ngx_http_variable_t *var;
|
|
50
|
775
|
|
132
|
776 var = ngx_http_add_variable(cf, &ngx_http_gzip_ratio, NGX_HTTP_VAR_NOHASH);
|
|
122
|
777 if (var == NULL) {
|
|
|
778 return NGX_ERROR;
|
|
|
779 }
|
|
|
780
|
|
186
|
781 var->get_handler = ngx_http_gzip_ratio_variable;
|
|
122
|
782
|
|
50
|
783 return NGX_OK;
|
|
|
784 }
|
|
|
785
|
|
|
786
|
|
|
787 static ngx_int_t
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122
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788 ngx_http_gzip_ratio_variable(ngx_http_request_t *r,
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789 ngx_http_variable_value_t *v, uintptr_t data)
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790 {
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791 ngx_uint_t zint, zfrac;
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792 ngx_http_gzip_ctx_t *ctx;
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793
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126
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794 v->valid = 1;
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340
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795 v->no_cacheable = 0;
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122
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796 v->not_found = 0;
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797
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798 ctx = ngx_http_get_module_ctx(r, ngx_http_gzip_filter_module);
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799
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800 if (ctx == NULL || ctx->zout == 0) {
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801 v->not_found = 1;
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802 return NGX_OK;
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803 }
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804
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805 v->data = ngx_palloc(r->pool, NGX_INT32_LEN + 3);
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806 if (v->data == NULL) {
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807 return NGX_ERROR;
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808 }
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809
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810 zint = (ngx_uint_t) (ctx->zin / ctx->zout);
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811 zfrac = (ngx_uint_t) ((ctx->zin * 100 / ctx->zout) % 100);
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812
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813 if ((ctx->zin * 1000 / ctx->zout) % 10 > 4) {
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814
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815 /* the rounding, e.g., 2.125 to 2.13 */
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816
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817 zfrac++;
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818
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819 if (zfrac > 99) {
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820 zint++;
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821 zfrac = 0;
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822 }
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823 }
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824
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825 v->len = ngx_sprintf(v->data, "%ui.%02ui", zint, zfrac) - v->data;
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826
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827 return NGX_OK;
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828 }
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829
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830
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50
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831 static void *
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832 ngx_http_gzip_create_conf(ngx_conf_t *cf)
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833 {
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834 ngx_http_gzip_conf_t *conf;
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835
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836 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_gzip_conf_t));
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837 if (conf == NULL) {
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838 return NGX_CONF_ERROR;
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839 }
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840
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841 /*
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842 * set by ngx_pcalloc():
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843 *
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844 * conf->bufs.num = 0;
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845 * conf->types = NULL;
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846 */
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847
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848 conf->enable = NGX_CONF_UNSET;
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849 conf->no_buffer = NGX_CONF_UNSET;
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850
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851 conf->level = NGX_CONF_UNSET;
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852 conf->wbits = (size_t) NGX_CONF_UNSET;
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853 conf->memlevel = (size_t) NGX_CONF_UNSET;
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854 conf->min_length = NGX_CONF_UNSET;
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855
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856 return conf;
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857 }
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858
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859
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860 static char *
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861 ngx_http_gzip_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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862 {
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863 ngx_http_gzip_conf_t *prev = parent;
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864 ngx_http_gzip_conf_t *conf = child;
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865
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76
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866 ngx_str_t *type;
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50
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867
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868 ngx_conf_merge_value(conf->enable, prev->enable, 0);
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869
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870 ngx_conf_merge_bufs_value(conf->bufs, prev->bufs, 4, ngx_pagesize);
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871
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872 ngx_conf_merge_value(conf->level, prev->level, 1);
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873 ngx_conf_merge_size_value(conf->wbits, prev->wbits, MAX_WBITS);
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874 ngx_conf_merge_size_value(conf->memlevel, prev->memlevel,
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875 MAX_MEM_LEVEL - 1);
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126
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876 ngx_conf_merge_value(conf->min_length, prev->min_length, 20);
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50
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877 ngx_conf_merge_value(conf->no_buffer, prev->no_buffer, 0);
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878
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879 if (conf->types == NULL) {
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880 if (prev->types == NULL) {
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76
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881 conf->types = ngx_array_create(cf->pool, 1, sizeof(ngx_str_t));
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50
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882 if (conf->types == NULL) {
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883 return NGX_CONF_ERROR;
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884 }
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885
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886 type = ngx_array_push(conf->types);
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887 if (type == NULL) {
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888 return NGX_CONF_ERROR;
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889 }
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890
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76
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891 type->len = sizeof("text/html") - 1;
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892 type->data = (u_char *) "text/html";
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50
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893
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894 } else {
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895 conf->types = prev->types;
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896 }
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897 }
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898
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899 return NGX_CONF_OK;
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900 }
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901
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902
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230
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903 static ngx_int_t
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904 ngx_http_gzip_filter_init(ngx_conf_t *cf)
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905 {
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906 ngx_http_next_header_filter = ngx_http_top_header_filter;
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907 ngx_http_top_header_filter = ngx_http_gzip_header_filter;
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908
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909 ngx_http_next_body_filter = ngx_http_top_body_filter;
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910 ngx_http_top_body_filter = ngx_http_gzip_body_filter;
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911
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912 return NGX_OK;
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913 }
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914
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915
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50
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916 static char *
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76
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917 ngx_http_gzip_types(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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50
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918 {
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919 ngx_http_gzip_conf_t *gcf = conf;
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920
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76
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921 ngx_str_t *value, *type;
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922 ngx_uint_t i;
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50
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923
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924 if (gcf->types == NULL) {
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76
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925 gcf->types = ngx_array_create(cf->pool, 4, sizeof(ngx_str_t));
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50
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926 if (gcf->types == NULL) {
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927 return NGX_CONF_ERROR;
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928 }
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929
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930 type = ngx_array_push(gcf->types);
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931 if (type == NULL) {
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932 return NGX_CONF_ERROR;
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933 }
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934
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76
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935 type->len = sizeof("text/html") - 1;
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936 type->data = (u_char *) "text/html";
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50
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937 }
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938
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939 value = cf->args->elts;
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940
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941 for (i = 1; i < cf->args->nelts; i++) {
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942
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943 if (ngx_strcmp(value[i].data, "text/html") == 0) {
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944 continue;
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945 }
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946
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947 type = ngx_array_push(gcf->types);
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948 if (type == NULL) {
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949 return NGX_CONF_ERROR;
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950 }
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951
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76
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952 type->len = value[i].len;
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50
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953
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76
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954 type->data = ngx_palloc(cf->pool, type->len + 1);
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955 if (type->data == NULL) {
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50
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956 return NGX_CONF_ERROR;
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957 }
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958
|
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76
|
959 ngx_cpystrn(type->data, value[i].data, type->len + 1);
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50
|
960 }
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961
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962 return NGX_CONF_OK;
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963 }
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|
964
|
|
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965
|
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966 static char *
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76
|
967 ngx_http_gzip_window(ngx_conf_t *cf, void *post, void *data)
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50
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968 {
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969 int *np = data;
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970
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971 int wbits, wsize;
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972
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973 wbits = 15;
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974
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975 for (wsize = 32 * 1024; wsize > 256; wsize >>= 1) {
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976
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977 if (wsize == *np) {
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978 *np = wbits;
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979
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980 return NGX_CONF_OK;
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|
981 }
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|
|
982
|
|
|
983 wbits--;
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|
984 }
|
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|
985
|
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|
986 return "must be 512, 1k, 2k, 4k, 8k, 16k, or 32k";
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987 }
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988
|
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|
989
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990 static char *
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|
76
|
991 ngx_http_gzip_hash(ngx_conf_t *cf, void *post, void *data)
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50
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992 {
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993 int *np = data;
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994
|
|
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995 int memlevel, hsize;
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996
|
|
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997 memlevel = 9;
|
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|
998
|
|
|
999 for (hsize = 128 * 1024; hsize > 256; hsize >>= 1) {
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|
|
1000
|
|
|
1001 if (hsize == *np) {
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|
|
1002 *np = memlevel;
|
|
|
1003
|
|
|
1004 return NGX_CONF_OK;
|
|
|
1005 }
|
|
|
1006
|
|
|
1007 memlevel--;
|
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|
1008 }
|
|
|
1009
|
|
|
1010 return "must be 512, 1k, 2k, 4k, 8k, 16k, 32k, 64k, or 128k";
|
|
|
1011 }
|
