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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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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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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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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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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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382
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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
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213 conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module);
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214
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215 if (!conf->enable
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216 || (r->headers_out.status != NGX_HTTP_OK
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217 && r->headers_out.status != NGX_HTTP_FORBIDDEN
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218 && r->headers_out.status != NGX_HTTP_NOT_FOUND)
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219 || r->header_only
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220 || r->headers_out.content_type.len == 0
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221 || (r->headers_out.content_encoding
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222 && r->headers_out.content_encoding->value.len)
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223 || (r->headers_out.content_length_n != -1
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224 && r->headers_out.content_length_n < conf->min_length)
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358
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225 || ngx_http_gzip_ok(r) != NGX_OK)
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226 {
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227 return ngx_http_next_header_filter(r);
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228 }
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229
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230 type = conf->types->elts;
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231 for (i = 0; i < conf->types->nelts; i++) {
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232 if (r->headers_out.content_type.len >= type[i].len
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126
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233 && ngx_strncasecmp(r->headers_out.content_type.data,
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234 type[i].data, type[i].len) == 0)
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235 {
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236 goto found;
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237 }
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238 }
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239
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240 return ngx_http_next_header_filter(r);
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241
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242 found:
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243
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244 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_gzip_ctx_t));
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245 if (ctx == NULL) {
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246 return NGX_ERROR;
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247 }
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248
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249 ngx_http_set_ctx(r, ctx, ngx_http_gzip_filter_module);
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250
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251 ctx->request = r;
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252
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358
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253 h = ngx_list_push(&r->headers_out.headers);
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254 if (h == NULL) {
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255 return NGX_ERROR;
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256 }
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257
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358
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258 h->hash = 1;
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259 h->key.len = sizeof("Content-Encoding") - 1;
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260 h->key.data = (u_char *) "Content-Encoding";
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261 h->value.len = sizeof("gzip") - 1;
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262 h->value.data = (u_char *) "gzip";
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342
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263
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358
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264 r->headers_out.content_encoding = h;
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265
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266 ctx->length = r->headers_out.content_length_n;
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267
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268 r->main_filter_need_in_memory = 1;
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269
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126
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270 ngx_http_clear_content_length(r);
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271 ngx_http_clear_accept_ranges(r);
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272
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273 return ngx_http_next_header_filter(r);
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274 }
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275
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276
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277 static ngx_int_t
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278 ngx_http_gzip_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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279 {
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280 int rc, wbits, memlevel;
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281 ngx_int_t last;
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282 struct gztrailer *trailer;
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283 ngx_buf_t *b;
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284 ngx_chain_t *cl, out;
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285 ngx_http_gzip_ctx_t *ctx;
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286 ngx_http_gzip_conf_t *conf;
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287
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288 ctx = ngx_http_get_module_ctx(r, ngx_http_gzip_filter_module);
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289
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290 if (ctx == NULL || ctx->done) {
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291 return ngx_http_next_body_filter(r, in);
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292 }
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293
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294 conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module);
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295
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296 if (ctx->preallocated == NULL) {
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297 wbits = conf->wbits;
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298 memlevel = conf->memlevel;
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299
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300 if (ctx->length > 0) {
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301
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302 /* the actual zlib window size is smaller by 262 bytes */
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303
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304 while (ctx->length < ((1 << (wbits - 1)) - 262)) {
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305 wbits--;
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306 memlevel--;
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307 }
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308 }
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309
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310 /*
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311 * We preallocate a memory for zlib in one buffer (200K-400K), this
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312 * decreases a number of malloc() and free() calls and also probably
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313 * decreases a number of syscalls (sbrk() and so on).
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314 * Besides we free this memory as soon as the gzipping will complete
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315 * and do not wait while a whole response will be sent to a client.
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316 *
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317 * 8K is for zlib deflate_state, it takes
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58
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318 * *) 5816 bytes on i386 and sparc64 (32-bit mode)
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319 * *) 5920 bytes on amd64 and sparc64
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320 */
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321
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322 ctx->allocated = 8192 + (1 << (wbits + 2)) + (1 << (memlevel + 9));
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323
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324 ctx->preallocated = ngx_palloc(r->pool, ctx->allocated);
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325 if (ctx->preallocated == NULL) {
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326 return NGX_ERROR;
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327 }
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328
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329 ctx->free_mem = ctx->preallocated;
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330
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331 ctx->zstream.zalloc = ngx_http_gzip_filter_alloc;
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332 ctx->zstream.zfree = ngx_http_gzip_filter_free;
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333 ctx->zstream.opaque = ctx;
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334
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138
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335 rc = deflateInit2(&ctx->zstream, (int) conf->level, Z_DEFLATED,
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50
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336 -wbits, memlevel, Z_DEFAULT_STRATEGY);
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337
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338 if (rc != Z_OK) {
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339 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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340 "deflateInit2() failed: %d", rc);
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341 ngx_http_gzip_error(ctx);
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342 return NGX_ERROR;
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343 }
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344
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345 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
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346 if (b == NULL) {
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347 ngx_http_gzip_error(ctx);
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348 return NGX_ERROR;
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349 }
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350
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351 b->memory = 1;
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352 b->pos = gzheader;
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353 b->last = b->pos + 10;
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354
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355 out.buf = b;
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356 out.next = NULL;
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357
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358 /*
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359 * We pass the gzheader to the next filter now to avoid its linking
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360 * to the ctx->busy chain. zlib does not usually output the compressed
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361 * data in the initial iterations, so the gzheader that was linked
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362 * to the ctx->busy chain would be flushed by ngx_http_write_filter().
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363 */
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364
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365 if (ngx_http_next_body_filter(r, &out) == NGX_ERROR) {
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366 ngx_http_gzip_error(ctx);
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367 return NGX_ERROR;
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368 }
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369
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146
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370 r->connection->buffered |= NGX_HTTP_GZIP_BUFFERED;
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371
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50
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372 ctx->last_out = &ctx->out;
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373
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374 ctx->crc32 = crc32(0L, Z_NULL, 0);
|
|
|
375 ctx->flush = Z_NO_FLUSH;
|
|
|
376 }
|
|
|
377
|
|
|
378 if (in) {
|
|
|
379 if (ngx_chain_add_copy(r->pool, &ctx->in, in) == NGX_ERROR) {
|
|
|
380 ngx_http_gzip_error(ctx);
|
|
|
381 return NGX_ERROR;
|
|
|
382 }
|
|
|
383 }
|
|
|
384
|
|
|
385 last = NGX_NONE;
|
|
|
386
|
|
|
387 for ( ;; ) {
|
|
|
388
|
|
|
389 for ( ;; ) {
|
|
|
390
|
|
|
391 /* does zlib need a new data ? */
|
|
|
392
|
|
|
393 if (ctx->zstream.avail_in == 0
|
|
|
394 && ctx->flush == Z_NO_FLUSH
|
|
|
395 && !ctx->redo)
|
|
|
396 {
|
|
|
397 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
398 "gzip in: %p", ctx->in);
|
|
|
399
|
|
|
400 if (ctx->in == NULL) {
|
|
|
401 break;
|
|
|
402 }
|
|
|
403
|
|
|
404 ctx->in_buf = ctx->in->buf;
|
|
|
405 ctx->in = ctx->in->next;
|
|
|
406
|
|
|
407 ctx->zstream.next_in = ctx->in_buf->pos;
|
|
|
408 ctx->zstream.avail_in = ctx->in_buf->last - ctx->in_buf->pos;
|
|
|
409
|
|
|
410 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
411 "gzip in_buf:%p ni:%p ai:%ud",
|
|
|
412 ctx->in_buf,
|
|
|
413 ctx->zstream.next_in, ctx->zstream.avail_in);
|
|
|
414
|
|
|
415 /* STUB */
|
|
|
416 if (ctx->in_buf->last < ctx->in_buf->pos) {
|
|
|
417 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
|
|
|
418 "zstream.avail_in is huge");
|
|
|
419 ctx->done = 1;
|
|
|
420 return NGX_ERROR;
|
|
|
421 }
|
|
|
422 /**/
|
|
|
423
|
|
|
424 if (ctx->in_buf->last_buf) {
|
|
|
425 ctx->flush = Z_FINISH;
|
|
|
426
|
|
|
427 } else if (ctx->in_buf->flush) {
|
|
|
428 ctx->flush = Z_SYNC_FLUSH;
|
|
|
429 }
|
|
|
430
|
|
|
431 if (ctx->zstream.avail_in == 0) {
|
|
|
432 if (ctx->flush == Z_NO_FLUSH) {
|
|
|
433 continue;
|
|
|
434 }
|
|
|
435
|
|
|
436 } else {
|
|
|
437 ctx->crc32 = crc32(ctx->crc32, ctx->zstream.next_in,
|
|
|
438 ctx->zstream.avail_in);
|
|
|
439 }
|
|
|
440 }
|
|
|
441
|
|
|
442
|
|
|
443 /* is there a space for the gzipped data ? */
|
|
|
444
|
|
|
445 if (ctx->zstream.avail_out == 0) {
|
|
|
446
|
|
|
447 if (ctx->free) {
|
|
|
448 ctx->out_buf = ctx->free->buf;
|
|
|
449 ctx->free = ctx->free->next;
|
|
|
450
|
|
|
451 } else if (ctx->bufs < conf->bufs.num) {
|
|
|
452 ctx->out_buf = ngx_create_temp_buf(r->pool,
|
|
|
453 conf->bufs.size);
|
|
|
454 if (ctx->out_buf == NULL) {
|
|
|
455 ngx_http_gzip_error(ctx);
|
|
|
456 return NGX_ERROR;
|
|
|
457 }
|
|
|
458
|
|
|
459 ctx->out_buf->tag = (ngx_buf_tag_t)
|
|
|
460 &ngx_http_gzip_filter_module;
|
|
|
461 ctx->out_buf->recycled = 1;
|
|
|
462 ctx->bufs++;
|
|
|
463
|
|
|
464 } else {
|
|
|
465 break;
|
|
|
466 }
|
|
|
467
|
|
|
468 ctx->zstream.next_out = ctx->out_buf->pos;
|
|
|
469 ctx->zstream.avail_out = conf->bufs.size;
|
|
|
470 }
|
|
|
471
|
|
|
472 ngx_log_debug6(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
473 "deflate in: ni:%p no:%p ai:%ud ao:%ud fl:%d redo:%d",
|
|
|
474 ctx->zstream.next_in, ctx->zstream.next_out,
|
|
|
475 ctx->zstream.avail_in, ctx->zstream.avail_out,
|
|
|
476 ctx->flush, ctx->redo);
|
|
|
477
|
|
|
478 rc = deflate(&ctx->zstream, ctx->flush);
|
|
|
479
|
|
|
480 if (rc != Z_OK && rc != Z_STREAM_END) {
|
|
|
481 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
|
|
|
482 "deflate() failed: %d, %d", ctx->flush, rc);
|
|
|
483 ngx_http_gzip_error(ctx);
|
|
|
484 return NGX_ERROR;
|
|
|
485 }
|
|
|
486
|
|
|
487 ngx_log_debug5(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
488 "deflate out: ni:%p no:%p ai:%ud ao:%ud rc:%d",
|
|
|
489 ctx->zstream.next_in, ctx->zstream.next_out,
|
|
|
490 ctx->zstream.avail_in, ctx->zstream.avail_out,
|
|
|
491 rc);
|
|
|
492
|
|
|
493 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
494 "gzip in_buf:%p pos:%p",
|
|
|
495 ctx->in_buf, ctx->in_buf->pos);
|
|
|
496
|
|
|
497
|
|
|
498 if (ctx->zstream.next_in) {
|
|
|
499 ctx->in_buf->pos = ctx->zstream.next_in;
|
|
|
500
|
|
|
501 if (ctx->zstream.avail_in == 0) {
|
|
|
502 ctx->zstream.next_in = NULL;
|
|
|
503 }
|
|
|
504 }
|
|
|
505
|
|
|
506 ctx->out_buf->last = ctx->zstream.next_out;
|
|
|
507
|
|
|
508 if (ctx->zstream.avail_out == 0) {
|
|
|
509
|
|
|
510 /* zlib wants to output some more gzipped data */
|
|
|
511
|
|
|
512 cl = ngx_alloc_chain_link(r->pool);
|
|
|
513 if (cl == NULL) {
|
|
|
514 ngx_http_gzip_error(ctx);
|
|
|
515 return NGX_ERROR;
|
|
|
516 }
|
|
|
517
|
|
|
518 cl->buf = ctx->out_buf;
|
|
|
519 cl->next = NULL;
|
|
|
520 *ctx->last_out = cl;
|
|
|
521 ctx->last_out = &cl->next;
|
|
|
522
|
|
|
523 ctx->redo = 1;
|
|
|
524
|
|
|
525 continue;
|
|
|
526 }
|
|
|
527
|
|
|
528 ctx->redo = 0;
|
|
|
529
|
|
|
530 if (ctx->flush == Z_SYNC_FLUSH) {
|
|
|
531
|
|
58
|
532 ctx->zstream.avail_out = 0;
|
|
|
533 ctx->out_buf->flush = 1;
|
|
50
|
534 ctx->flush = Z_NO_FLUSH;
|
|
|
535
|
|
|
536 cl = ngx_alloc_chain_link(r->pool);
|
|
|
537 if (cl == NULL) {
|
|
|
538 ngx_http_gzip_error(ctx);
|
|
|
539 return NGX_ERROR;
|
|
|
540 }
|
|
|
541
|
|
|
542 cl->buf = ctx->out_buf;
|
|
|
543 cl->next = NULL;
|
|
|
544 *ctx->last_out = cl;
|
|
|
545 ctx->last_out = &cl->next;
|
|
|
546
|
|
|
547 break;
|
|
|
548 }
|
|
|
549
|
|
|
550 if (rc == Z_STREAM_END) {
|
|
|
551
|
|
|
552 ctx->zin = ctx->zstream.total_in;
|
|
|
553 ctx->zout = 10 + ctx->zstream.total_out + 8;
|
|
|
554
|
|
|
555 rc = deflateEnd(&ctx->zstream);
|
|
|
556
|
|
|
557 if (rc != Z_OK) {
|
|
|
558 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
|
|
|
559 "deflateEnd() failed: %d", rc);
|
|
|
560 ngx_http_gzip_error(ctx);
|
|
|
561 return NGX_ERROR;
|
|
|
562 }
|
|
|
563
|
|
|
564 ngx_pfree(r->pool, ctx->preallocated);
|
|
|
565
|
|
|
566 cl = ngx_alloc_chain_link(r->pool);
|
|
|
567 if (cl == NULL) {
|
|
|
568 ngx_http_gzip_error(ctx);
|
|
|
569 return NGX_ERROR;
|
|
|
570 }
|
|
|
571
|
|
|
572 cl->buf = ctx->out_buf;
|
|
|
573 cl->next = NULL;
|
|
|
574 *ctx->last_out = cl;
|
|
|
575 ctx->last_out = &cl->next;
|
|
|
576
|
|
|
577 if (ctx->zstream.avail_out >= 8) {
|
|
|
578 trailer = (struct gztrailer *) ctx->out_buf->last;
|
|
|
579 ctx->out_buf->last += 8;
|
|
|
580 ctx->out_buf->last_buf = 1;
|
|
|
581
|
|
|
582 } else {
|
|
|
583 b = ngx_create_temp_buf(r->pool, 8);
|
|
|
584 if (b == NULL) {
|
|
|
585 ngx_http_gzip_error(ctx);
|
|
|
586 return NGX_ERROR;
|
|
|
587 }
|
|
|
588
|
|
|
589 b->last_buf = 1;
|
|
|
590
|
|
|
591 cl = ngx_alloc_chain_link(r->pool);
|
|
|
592 if (cl == NULL) {
|
|
|
593 ngx_http_gzip_error(ctx);
|
|
|
594 return NGX_ERROR;
|
|
|
595 }
|
|
|
596
|
|
|
597 cl->buf = b;
|
|
|
598 cl->next = NULL;
|
|
|
599 *ctx->last_out = cl;
|
|
|
600 ctx->last_out = &cl->next;
|
|
|
601 trailer = (struct gztrailer *) b->pos;
|
|
|
602 b->last += 8;
|
|
|
603 }
|
|
|
604
|
|
|
605 #if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)
|
|
|
606
|
|
|
607 trailer->crc32 = ctx->crc32;
|
|
|
608 trailer->zlen = ctx->zin;
|
|
|
609
|
|
|
610 #else
|
|
|
611 trailer->crc32[0] = (u_char) (ctx->crc32 & 0xff);
|
|
|
612 trailer->crc32[1] = (u_char) ((ctx->crc32 >> 8) & 0xff);
|
|
|
613 trailer->crc32[2] = (u_char) ((ctx->crc32 >> 16) & 0xff);
|
|
|
614 trailer->crc32[3] = (u_char) ((ctx->crc32 >> 24) & 0xff);
|
|
|
615
|
|
|
616 trailer->zlen[0] = (u_char) (ctx->zin & 0xff);
|
|
|
617 trailer->zlen[1] = (u_char) ((ctx->zin >> 8) & 0xff);
|
|
|
618 trailer->zlen[2] = (u_char) ((ctx->zin >> 16) & 0xff);
|
|
|
619 trailer->zlen[3] = (u_char) ((ctx->zin >> 24) & 0xff);
|
|
|
620 #endif
|
|
|
621
|
|
|
622 ctx->zstream.avail_in = 0;
|
|
|
623 ctx->zstream.avail_out = 0;
|
|
|
624
|
|
|
625 ctx->done = 1;
|
|
|
626
|
|
146
|
627 r->connection->buffered &= ~NGX_HTTP_GZIP_BUFFERED;
|
|
|
628
|
|
50
|
629 break;
|
|
|
630 }
|
|
|
631
|
|
|
632 if (conf->no_buffer && ctx->in == NULL) {
|
|
|
633
|
|
|
634 cl = ngx_alloc_chain_link(r->pool);
|
|
|
635 if (cl == NULL) {
|
|
|
636 ngx_http_gzip_error(ctx);
|
|
|
637 return NGX_ERROR;
|
|
|
638 }
|
|
|
639
|
|
|
640 cl->buf = ctx->out_buf;
|
|
|
641 cl->next = NULL;
|
|
|
642 *ctx->last_out = cl;
|
|
|
643 ctx->last_out = &cl->next;
|
|
|
644
|
|
|
645 break;
|
|
|
646 }
|
|
|
647 }
|
|
|
648
|
|
346
|
649 if (ctx->out == NULL) {
|
|
50
|
650
|
|
346
|
651 if (last == NGX_AGAIN) {
|
|
|
652 return NGX_AGAIN;
|
|
|
653 }
|
|
|
654
|
|
|
655 if (ctx->busy == NULL) {
|
|
|
656 return NGX_OK;
|
|
|
657 }
|
|
50
|
658 }
|
|
|
659
|
|
|
660 last = ngx_http_next_body_filter(r, ctx->out);
|
|
|
661
|
|
|
662 /*
|
|
|
663 * we do not check NGX_AGAIN here because the downstream filters
|
|
|
664 * may free some buffers and zlib may compress some data into them
|
|
|
665 */
|
|
|
666
|
|
|
667 if (last == NGX_ERROR) {
|
|
|
668 ngx_http_gzip_error(ctx);
|
|
|
669 return NGX_ERROR;
|
|
|
670 }
|
|
|
671
|
|
|
672 ngx_chain_update_chains(&ctx->free, &ctx->busy, &ctx->out,
|
|
|
673 (ngx_buf_tag_t) &ngx_http_gzip_filter_module);
|
|
|
674 ctx->last_out = &ctx->out;
|
|
|
675
|
|
|
676 if (ctx->done) {
|
|
|
677 return last;
|
|
|
678 }
|
|
|
679 }
|
|
|
680 }
|
|
|
681
|
|
|
682
|
|
|
683 static void *
|
|
|
684 ngx_http_gzip_filter_alloc(void *opaque, u_int items, u_int size)
|
|
|
685 {
|
|
|
686 ngx_http_gzip_ctx_t *ctx = opaque;
|
|
|
687
|
|
|
688 void *p;
|
|
|
689 ngx_uint_t alloc;
|
|
|
690
|
|
|
691 alloc = items * size;
|
|
|
692
|
|
|
693 if (alloc % 512 != 0) {
|
|
|
694
|
|
|
695 /*
|
|
|
696 * The zlib deflate_state allocation, it takes about 6K,
|
|
|
697 * we allocate 8K. Other allocations are divisible by 512.
|
|
|
698 */
|
|
|
699
|
|
|
700 alloc = (alloc + ngx_pagesize - 1) & ~(ngx_pagesize - 1);
|
|
|
701 }
|
|
|
702
|
|
|
703 if (alloc <= ctx->allocated) {
|
|
|
704 p = ctx->free_mem;
|
|
|
705 ctx->free_mem += alloc;
|
|
|
706 ctx->allocated -= alloc;
|
|
|
707
|
|
|
708 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0,
|
|
|
709 "gzip alloc: n:%ud s:%ud a:%ud p:%p",
|
|
|
710 items, size, alloc, p);
|
|
|
711
|
|
|
712 return p;
|
|
|
713 }
|
|
|
714
|
|
|
715 ngx_log_error(NGX_LOG_ALERT, ctx->request->connection->log, 0,
|
|
|
716 "gzip filter failed to use preallocated memory: %ud of %ud",
|
|
|
717 items * size, ctx->allocated);
|
|
|
718
|
|
|
719 p = ngx_palloc(ctx->request->pool, items * size);
|
|
|
720
|
|
|
721 return p;
|
|
|
722 }
|
|
|
723
|
|
|
724
|
|
|
725 static void
|
|
|
726 ngx_http_gzip_filter_free(void *opaque, void *address)
|
|
|
727 {
|
|
|
728 #if 0
|
|
|
729 ngx_http_gzip_ctx_t *ctx = opaque;
|
|
|
730
|
|
|
731 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0,
|
|
|
732 "gzip free: %p", address);
|
|
|
733 #endif
|
|
|
734 }
|
|
|
735
|
|
|
736
|
|
|
737 static void
|
|
|
738 ngx_http_gzip_error(ngx_http_gzip_ctx_t *ctx)
|
|
|
739 {
|
|
|
740 deflateEnd(&ctx->zstream);
|
|
|
741
|
|
|
742 if (ctx->preallocated) {
|
|
|
743 ngx_pfree(ctx->request->pool, ctx->preallocated);
|
|
|
744 }
|
|
|
745
|
|
|
746 ctx->zstream.avail_in = 0;
|
|
|
747 ctx->zstream.avail_out = 0;
|
|
|
748
|
|
|
749 ctx->done = 1;
|
|
|
750
|
|
|
751 return;
|
|
|
752 }
|
|
|
753
|
|
|
754
|
|
|
755 static ngx_int_t
|
|
122
|
756 ngx_http_gzip_add_variables(ngx_conf_t *cf)
|
|
50
|
757 {
|
|
260
|
758 ngx_http_variable_t *var;
|
|
50
|
759
|
|
132
|
760 var = ngx_http_add_variable(cf, &ngx_http_gzip_ratio, NGX_HTTP_VAR_NOHASH);
|
|
122
|
761 if (var == NULL) {
|
|
|
762 return NGX_ERROR;
|
|
|
763 }
|
|
|
764
|
|
186
|
765 var->get_handler = ngx_http_gzip_ratio_variable;
|
|
122
|
766
|
|
50
|
767 return NGX_OK;
|
|
|
768 }
|
|
|
769
|
|
|
770
|
|
|
771 static ngx_int_t
|
|
122
|
772 ngx_http_gzip_ratio_variable(ngx_http_request_t *r,
|
|
|
773 ngx_http_variable_value_t *v, uintptr_t data)
|
|
|
774 {
|
|
|
775 ngx_uint_t zint, zfrac;
|
|
|
776 ngx_http_gzip_ctx_t *ctx;
|
|
|
777
|
|
126
|
778 v->valid = 1;
|
|
340
|
779 v->no_cacheable = 0;
|
|
122
|
780 v->not_found = 0;
|
|
|
781
|
|
|
782 ctx = ngx_http_get_module_ctx(r, ngx_http_gzip_filter_module);
|
|
|
783
|
|
|
784 if (ctx == NULL || ctx->zout == 0) {
|
|
|
785 v->not_found = 1;
|
|
|
786 return NGX_OK;
|
|
|
787 }
|
|
|
788
|
|
382
|
789 v->data = ngx_pnalloc(r->pool, NGX_INT32_LEN + 3);
|
|
122
|
790 if (v->data == NULL) {
|
|
|
791 return NGX_ERROR;
|
|
|
792 }
|
|
|
793
|
|
|
794 zint = (ngx_uint_t) (ctx->zin / ctx->zout);
|
|
|
795 zfrac = (ngx_uint_t) ((ctx->zin * 100 / ctx->zout) % 100);
|
|
|
796
|
|
|
797 if ((ctx->zin * 1000 / ctx->zout) % 10 > 4) {
|
|
|
798
|
|
|
799 /* the rounding, e.g., 2.125 to 2.13 */
|
|
|
800
|
|
|
801 zfrac++;
|
|
|
802
|
|
|
803 if (zfrac > 99) {
|
|
|
804 zint++;
|
|
|
805 zfrac = 0;
|
|
|
806 }
|
|
|
807 }
|
|
|
808
|
|
|
809 v->len = ngx_sprintf(v->data, "%ui.%02ui", zint, zfrac) - v->data;
|
|
|
810
|
|
|
811 return NGX_OK;
|
|
|
812 }
|
|
|
813
|
|
|
814
|
|
50
|
815 static void *
|
|
|
816 ngx_http_gzip_create_conf(ngx_conf_t *cf)
|
|
|
817 {
|
|
|
818 ngx_http_gzip_conf_t *conf;
|
|
|
819
|
|
|
820 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_gzip_conf_t));
|
|
|
821 if (conf == NULL) {
|
|
|
822 return NGX_CONF_ERROR;
|
|
|
823 }
|
|
|
824
|
|
|
825 /*
|
|
|
826 * set by ngx_pcalloc():
|
|
|
827 *
|
|
|
828 * conf->bufs.num = 0;
|
|
|
829 * conf->types = NULL;
|
|
|
830 */
|
|
|
831
|
|
|
832 conf->enable = NGX_CONF_UNSET;
|
|
|
833 conf->no_buffer = NGX_CONF_UNSET;
|
|
|
834
|
|
|
835 conf->level = NGX_CONF_UNSET;
|
|
|
836 conf->wbits = (size_t) NGX_CONF_UNSET;
|
|
|
837 conf->memlevel = (size_t) NGX_CONF_UNSET;
|
|
|
838 conf->min_length = NGX_CONF_UNSET;
|
|
|
839
|
|
|
840 return conf;
|
|
|
841 }
|
|
|
842
|
|
|
843
|
|
|
844 static char *
|
|
|
845 ngx_http_gzip_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
846 {
|
|
|
847 ngx_http_gzip_conf_t *prev = parent;
|
|
|
848 ngx_http_gzip_conf_t *conf = child;
|
|
|
849
|
|
76
|
850 ngx_str_t *type;
|
|
50
|
851
|
|
|
852 ngx_conf_merge_value(conf->enable, prev->enable, 0);
|
|
|
853
|
|
|
854 ngx_conf_merge_bufs_value(conf->bufs, prev->bufs, 4, ngx_pagesize);
|
|
|
855
|
|
|
856 ngx_conf_merge_value(conf->level, prev->level, 1);
|
|
|
857 ngx_conf_merge_size_value(conf->wbits, prev->wbits, MAX_WBITS);
|
|
|
858 ngx_conf_merge_size_value(conf->memlevel, prev->memlevel,
|
|
|
859 MAX_MEM_LEVEL - 1);
|
|
126
|
860 ngx_conf_merge_value(conf->min_length, prev->min_length, 20);
|
|
50
|
861 ngx_conf_merge_value(conf->no_buffer, prev->no_buffer, 0);
|
|
|
862
|
|
|
863 if (conf->types == NULL) {
|
|
|
864 if (prev->types == NULL) {
|
|
76
|
865 conf->types = ngx_array_create(cf->pool, 1, sizeof(ngx_str_t));
|
|
50
|
866 if (conf->types == NULL) {
|
|
|
867 return NGX_CONF_ERROR;
|
|
|
868 }
|
|
|
869
|
|
|
870 type = ngx_array_push(conf->types);
|
|
|
871 if (type == NULL) {
|
|
|
872 return NGX_CONF_ERROR;
|
|
|
873 }
|
|
|
874
|
|
76
|
875 type->len = sizeof("text/html") - 1;
|
|
|
876 type->data = (u_char *) "text/html";
|
|
50
|
877
|
|
|
878 } else {
|
|
|
879 conf->types = prev->types;
|
|
|
880 }
|
|
|
881 }
|
|
|
882
|
|
|
883 return NGX_CONF_OK;
|
|
|
884 }
|
|
|
885
|
|
|
886
|
|
230
|
887 static ngx_int_t
|
|
|
888 ngx_http_gzip_filter_init(ngx_conf_t *cf)
|
|
|
889 {
|
|
|
890 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
891 ngx_http_top_header_filter = ngx_http_gzip_header_filter;
|
|
|
892
|
|
|
893 ngx_http_next_body_filter = ngx_http_top_body_filter;
|
|
|
894 ngx_http_top_body_filter = ngx_http_gzip_body_filter;
|
|
|
895
|
|
|
896 return NGX_OK;
|
|
|
897 }
|
|
|
898
|
|
|
899
|
|
50
|
900 static char *
|
|
76
|
901 ngx_http_gzip_types(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
50
|
902 {
|
|
|
903 ngx_http_gzip_conf_t *gcf = conf;
|
|
|
904
|
|
76
|
905 ngx_str_t *value, *type;
|
|
|
906 ngx_uint_t i;
|
|
50
|
907
|
|
|
908 if (gcf->types == NULL) {
|
|
76
|
909 gcf->types = ngx_array_create(cf->pool, 4, sizeof(ngx_str_t));
|
|
50
|
910 if (gcf->types == NULL) {
|
|
|
911 return NGX_CONF_ERROR;
|
|
|
912 }
|
|
|
913
|
|
|
914 type = ngx_array_push(gcf->types);
|
|
|
915 if (type == NULL) {
|
|
|
916 return NGX_CONF_ERROR;
|
|
|
917 }
|
|
|
918
|
|
76
|
919 type->len = sizeof("text/html") - 1;
|
|
|
920 type->data = (u_char *) "text/html";
|
|
50
|
921 }
|
|
|
922
|
|
|
923 value = cf->args->elts;
|
|
|
924
|
|
|
925 for (i = 1; i < cf->args->nelts; i++) {
|
|
|
926
|
|
|
927 if (ngx_strcmp(value[i].data, "text/html") == 0) {
|
|
|
928 continue;
|
|
|
929 }
|
|
|
930
|
|
|
931 type = ngx_array_push(gcf->types);
|
|
|
932 if (type == NULL) {
|
|
|
933 return NGX_CONF_ERROR;
|
|
|
934 }
|
|
|
935
|
|
76
|
936 type->len = value[i].len;
|
|
50
|
937
|
|
382
|
938 type->data = ngx_pnalloc(cf->pool, type->len + 1);
|
|
76
|
939 if (type->data == NULL) {
|
|
50
|
940 return NGX_CONF_ERROR;
|
|
|
941 }
|
|
|
942
|
|
76
|
943 ngx_cpystrn(type->data, value[i].data, type->len + 1);
|
|
50
|
944 }
|
|
|
945
|
|
|
946 return NGX_CONF_OK;
|
|
|
947 }
|
|
|
948
|
|
|
949
|
|
|
950 static char *
|
|
76
|
951 ngx_http_gzip_window(ngx_conf_t *cf, void *post, void *data)
|
|
50
|
952 {
|
|
|
953 int *np = data;
|
|
|
954
|
|
|
955 int wbits, wsize;
|
|
|
956
|
|
|
957 wbits = 15;
|
|
|
958
|
|
|
959 for (wsize = 32 * 1024; wsize > 256; wsize >>= 1) {
|
|
|
960
|
|
|
961 if (wsize == *np) {
|
|
|
962 *np = wbits;
|
|
|
963
|
|
|
964 return NGX_CONF_OK;
|
|
|
965 }
|
|
|
966
|
|
|
967 wbits--;
|
|
|
968 }
|
|
|
969
|
|
|
970 return "must be 512, 1k, 2k, 4k, 8k, 16k, or 32k";
|
|
|
971 }
|
|
|
972
|
|
|
973
|
|
|
974 static char *
|
|
76
|
975 ngx_http_gzip_hash(ngx_conf_t *cf, void *post, void *data)
|
|
50
|
976 {
|
|
|
977 int *np = data;
|
|
|
978
|
|
|
979 int memlevel, hsize;
|
|
|
980
|
|
|
981 memlevel = 9;
|
|
|
982
|
|
|
983 for (hsize = 128 * 1024; hsize > 256; hsize >>= 1) {
|
|
|
984
|
|
|
985 if (hsize == *np) {
|
|
|
986 *np = memlevel;
|
|
|
987
|
|
|
988 return NGX_CONF_OK;
|
|
|
989 }
|
|
|
990
|
|
|
991 memlevel--;
|
|
|
992 }
|
|
|
993
|
|
|
994 return "must be 512, 1k, 2k, 4k, 8k, 16k, 32k, 64k, or 128k";
|
|
|
995 }
|
