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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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394
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18 ngx_hash_t types;
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19
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20 ngx_bufs_t bufs;
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21
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22 ngx_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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394
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26
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27 ngx_array_t *types_keys;
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28 } ngx_http_gzip_conf_t;
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29
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30
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31 typedef struct {
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32 ngx_chain_t *in;
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33 ngx_chain_t *free;
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34 ngx_chain_t *busy;
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35 ngx_chain_t *out;
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36 ngx_chain_t **last_out;
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37 ngx_buf_t *in_buf;
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38 ngx_buf_t *out_buf;
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39 ngx_int_t bufs;
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40
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41 off_t length;
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42
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43 void *preallocated;
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44 char *free_mem;
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45 ngx_uint_t allocated;
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46
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47 unsigned flush:4;
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48 unsigned redo:1;
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49 unsigned done:1;
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50
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51 size_t zin;
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52 size_t zout;
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53
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54 uint32_t crc32;
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55 z_stream zstream;
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56 ngx_http_request_t *request;
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57 } ngx_http_gzip_ctx_t;
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58
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59
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60 static void *ngx_http_gzip_filter_alloc(void *opaque, u_int items,
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61 u_int size);
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62 static void ngx_http_gzip_filter_free(void *opaque, void *address);
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63 static void ngx_http_gzip_error(ngx_http_gzip_ctx_t *ctx);
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64
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122
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65 static ngx_int_t ngx_http_gzip_add_variables(ngx_conf_t *cf);
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66 static ngx_int_t ngx_http_gzip_ratio_variable(ngx_http_request_t *r,
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67 ngx_http_variable_value_t *v, uintptr_t data);
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68
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230
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69 static ngx_int_t ngx_http_gzip_filter_init(ngx_conf_t *cf);
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70 static void *ngx_http_gzip_create_conf(ngx_conf_t *cf);
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71 static char *ngx_http_gzip_merge_conf(ngx_conf_t *cf,
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72 void *parent, void *child);
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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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394
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104 ngx_http_types_slot,
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105 NGX_HTTP_LOC_CONF_OFFSET,
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106 offsetof(ngx_http_gzip_conf_t, types_keys),
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107 &ngx_http_html_default_types[0] },
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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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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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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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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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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_table_elt_t *h;
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208 ngx_http_gzip_ctx_t *ctx;
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209 ngx_http_gzip_conf_t *conf;
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210
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211 conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module);
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212
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213 if (!conf->enable
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214 || (r->headers_out.status != NGX_HTTP_OK
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215 && r->headers_out.status != NGX_HTTP_FORBIDDEN
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216 && r->headers_out.status != NGX_HTTP_NOT_FOUND)
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217 || r->header_only
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218 || (r->headers_out.content_encoding
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219 && r->headers_out.content_encoding->value.len)
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220 || (r->headers_out.content_length_n != -1
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221 && r->headers_out.content_length_n < conf->min_length)
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222 || ngx_http_test_content_type(r, &conf->types) == NULL
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358
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223 || ngx_http_gzip_ok(r) != NGX_OK)
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224 {
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225 return ngx_http_next_header_filter(r);
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226 }
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227
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228 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_gzip_ctx_t));
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229 if (ctx == NULL) {
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230 return NGX_ERROR;
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231 }
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232
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233 ngx_http_set_ctx(r, ctx, ngx_http_gzip_filter_module);
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234
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235 ctx->request = r;
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236
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358
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237 h = ngx_list_push(&r->headers_out.headers);
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238 if (h == NULL) {
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239 return NGX_ERROR;
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240 }
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241
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358
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242 h->hash = 1;
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243 h->key.len = sizeof("Content-Encoding") - 1;
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244 h->key.data = (u_char *) "Content-Encoding";
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245 h->value.len = sizeof("gzip") - 1;
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246 h->value.data = (u_char *) "gzip";
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342
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247
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358
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248 r->headers_out.content_encoding = h;
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249
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250 ctx->length = r->headers_out.content_length_n;
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251
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252 r->main_filter_need_in_memory = 1;
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253
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126
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254 ngx_http_clear_content_length(r);
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255 ngx_http_clear_accept_ranges(r);
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256
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257 return ngx_http_next_header_filter(r);
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258 }
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259
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260
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261 static ngx_int_t
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262 ngx_http_gzip_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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263 {
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264 int rc, wbits, memlevel;
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265 ngx_int_t last;
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266 struct gztrailer *trailer;
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267 ngx_buf_t *b;
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268 ngx_chain_t *cl, out;
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269 ngx_http_gzip_ctx_t *ctx;
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270 ngx_http_gzip_conf_t *conf;
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271
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272 ctx = ngx_http_get_module_ctx(r, ngx_http_gzip_filter_module);
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273
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274 if (ctx == NULL || ctx->done) {
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275 return ngx_http_next_body_filter(r, in);
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276 }
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277
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278 conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module);
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279
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280 if (ctx->preallocated == NULL) {
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281 wbits = conf->wbits;
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282 memlevel = conf->memlevel;
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283
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284 if (ctx->length > 0) {
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285
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286 /* the actual zlib window size is smaller by 262 bytes */
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287
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288 while (ctx->length < ((1 << (wbits - 1)) - 262)) {
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289 wbits--;
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290 memlevel--;
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291 }
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292 }
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293
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294 /*
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295 * We preallocate a memory for zlib in one buffer (200K-400K), this
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296 * decreases a number of malloc() and free() calls and also probably
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297 * decreases a number of syscalls (sbrk() and so on).
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298 * Besides we free this memory as soon as the gzipping will complete
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299 * and do not wait while a whole response will be sent to a client.
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300 *
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301 * 8K is for zlib deflate_state, it takes
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58
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302 * *) 5816 bytes on i386 and sparc64 (32-bit mode)
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303 * *) 5920 bytes on amd64 and sparc64
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304 */
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305
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306 ctx->allocated = 8192 + (1 << (wbits + 2)) + (1 << (memlevel + 9));
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307
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308 ctx->preallocated = ngx_palloc(r->pool, ctx->allocated);
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309 if (ctx->preallocated == NULL) {
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310 return NGX_ERROR;
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311 }
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312
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313 ctx->free_mem = ctx->preallocated;
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314
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315 ctx->zstream.zalloc = ngx_http_gzip_filter_alloc;
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316 ctx->zstream.zfree = ngx_http_gzip_filter_free;
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317 ctx->zstream.opaque = ctx;
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318
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138
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319 rc = deflateInit2(&ctx->zstream, (int) conf->level, Z_DEFLATED,
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320 -wbits, memlevel, Z_DEFAULT_STRATEGY);
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321
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322 if (rc != Z_OK) {
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323 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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324 "deflateInit2() failed: %d", rc);
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325 ngx_http_gzip_error(ctx);
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326 return NGX_ERROR;
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327 }
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328
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329 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
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330 if (b == NULL) {
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331 ngx_http_gzip_error(ctx);
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332 return NGX_ERROR;
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333 }
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334
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335 b->memory = 1;
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336 b->pos = gzheader;
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337 b->last = b->pos + 10;
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338
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339 out.buf = b;
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340 out.next = NULL;
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341
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342 /*
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343 * We pass the gzheader to the next filter now to avoid its linking
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344 * to the ctx->busy chain. zlib does not usually output the compressed
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345 * data in the initial iterations, so the gzheader that was linked
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346 * to the ctx->busy chain would be flushed by ngx_http_write_filter().
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347 */
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348
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349 if (ngx_http_next_body_filter(r, &out) == NGX_ERROR) {
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350 ngx_http_gzip_error(ctx);
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351 return NGX_ERROR;
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352 }
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353
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146
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354 r->connection->buffered |= NGX_HTTP_GZIP_BUFFERED;
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355
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356 ctx->last_out = &ctx->out;
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357
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358 ctx->crc32 = crc32(0L, Z_NULL, 0);
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359 ctx->flush = Z_NO_FLUSH;
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360 }
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361
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362 if (in) {
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363 if (ngx_chain_add_copy(r->pool, &ctx->in, in) == NGX_ERROR) {
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364 ngx_http_gzip_error(ctx);
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365 return NGX_ERROR;
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366 }
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367 }
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368
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369 last = NGX_NONE;
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370
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371 for ( ;; ) {
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372
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373 for ( ;; ) {
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374
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375 /* does zlib need a new data ? */
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376
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377 if (ctx->zstream.avail_in == 0
|
|
|
378 && ctx->flush == Z_NO_FLUSH
|
|
|
379 && !ctx->redo)
|
|
|
380 {
|
|
|
381 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
382 "gzip in: %p", ctx->in);
|
|
|
383
|
|
|
384 if (ctx->in == NULL) {
|
|
|
385 break;
|
|
|
386 }
|
|
|
387
|
|
|
388 ctx->in_buf = ctx->in->buf;
|
|
|
389 ctx->in = ctx->in->next;
|
|
|
390
|
|
|
391 ctx->zstream.next_in = ctx->in_buf->pos;
|
|
|
392 ctx->zstream.avail_in = ctx->in_buf->last - ctx->in_buf->pos;
|
|
|
393
|
|
|
394 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
395 "gzip in_buf:%p ni:%p ai:%ud",
|
|
|
396 ctx->in_buf,
|
|
|
397 ctx->zstream.next_in, ctx->zstream.avail_in);
|
|
|
398
|
|
|
399 /* STUB */
|
|
|
400 if (ctx->in_buf->last < ctx->in_buf->pos) {
|
|
|
401 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
|
|
|
402 "zstream.avail_in is huge");
|
|
|
403 ctx->done = 1;
|
|
|
404 return NGX_ERROR;
|
|
|
405 }
|
|
|
406 /**/
|
|
|
407
|
|
|
408 if (ctx->in_buf->last_buf) {
|
|
|
409 ctx->flush = Z_FINISH;
|
|
|
410
|
|
|
411 } else if (ctx->in_buf->flush) {
|
|
|
412 ctx->flush = Z_SYNC_FLUSH;
|
|
|
413 }
|
|
|
414
|
|
|
415 if (ctx->zstream.avail_in == 0) {
|
|
|
416 if (ctx->flush == Z_NO_FLUSH) {
|
|
|
417 continue;
|
|
|
418 }
|
|
|
419
|
|
|
420 } else {
|
|
|
421 ctx->crc32 = crc32(ctx->crc32, ctx->zstream.next_in,
|
|
|
422 ctx->zstream.avail_in);
|
|
|
423 }
|
|
|
424 }
|
|
|
425
|
|
|
426
|
|
|
427 /* is there a space for the gzipped data ? */
|
|
|
428
|
|
|
429 if (ctx->zstream.avail_out == 0) {
|
|
|
430
|
|
|
431 if (ctx->free) {
|
|
|
432 ctx->out_buf = ctx->free->buf;
|
|
|
433 ctx->free = ctx->free->next;
|
|
|
434
|
|
|
435 } else if (ctx->bufs < conf->bufs.num) {
|
|
|
436 ctx->out_buf = ngx_create_temp_buf(r->pool,
|
|
|
437 conf->bufs.size);
|
|
|
438 if (ctx->out_buf == NULL) {
|
|
|
439 ngx_http_gzip_error(ctx);
|
|
|
440 return NGX_ERROR;
|
|
|
441 }
|
|
|
442
|
|
|
443 ctx->out_buf->tag = (ngx_buf_tag_t)
|
|
|
444 &ngx_http_gzip_filter_module;
|
|
|
445 ctx->out_buf->recycled = 1;
|
|
|
446 ctx->bufs++;
|
|
|
447
|
|
|
448 } else {
|
|
|
449 break;
|
|
|
450 }
|
|
|
451
|
|
|
452 ctx->zstream.next_out = ctx->out_buf->pos;
|
|
|
453 ctx->zstream.avail_out = conf->bufs.size;
|
|
|
454 }
|
|
|
455
|
|
|
456 ngx_log_debug6(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
457 "deflate in: ni:%p no:%p ai:%ud ao:%ud fl:%d redo:%d",
|
|
|
458 ctx->zstream.next_in, ctx->zstream.next_out,
|
|
|
459 ctx->zstream.avail_in, ctx->zstream.avail_out,
|
|
|
460 ctx->flush, ctx->redo);
|
|
|
461
|
|
|
462 rc = deflate(&ctx->zstream, ctx->flush);
|
|
|
463
|
|
|
464 if (rc != Z_OK && rc != Z_STREAM_END) {
|
|
|
465 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
|
|
|
466 "deflate() failed: %d, %d", ctx->flush, rc);
|
|
|
467 ngx_http_gzip_error(ctx);
|
|
|
468 return NGX_ERROR;
|
|
|
469 }
|
|
|
470
|
|
|
471 ngx_log_debug5(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
472 "deflate out: ni:%p no:%p ai:%ud ao:%ud rc:%d",
|
|
|
473 ctx->zstream.next_in, ctx->zstream.next_out,
|
|
|
474 ctx->zstream.avail_in, ctx->zstream.avail_out,
|
|
|
475 rc);
|
|
|
476
|
|
|
477 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
478 "gzip in_buf:%p pos:%p",
|
|
|
479 ctx->in_buf, ctx->in_buf->pos);
|
|
|
480
|
|
|
481
|
|
|
482 if (ctx->zstream.next_in) {
|
|
|
483 ctx->in_buf->pos = ctx->zstream.next_in;
|
|
|
484
|
|
|
485 if (ctx->zstream.avail_in == 0) {
|
|
|
486 ctx->zstream.next_in = NULL;
|
|
|
487 }
|
|
|
488 }
|
|
|
489
|
|
|
490 ctx->out_buf->last = ctx->zstream.next_out;
|
|
|
491
|
|
|
492 if (ctx->zstream.avail_out == 0) {
|
|
|
493
|
|
|
494 /* zlib wants to output some more gzipped data */
|
|
|
495
|
|
|
496 cl = ngx_alloc_chain_link(r->pool);
|
|
|
497 if (cl == NULL) {
|
|
|
498 ngx_http_gzip_error(ctx);
|
|
|
499 return NGX_ERROR;
|
|
|
500 }
|
|
|
501
|
|
|
502 cl->buf = ctx->out_buf;
|
|
|
503 cl->next = NULL;
|
|
|
504 *ctx->last_out = cl;
|
|
|
505 ctx->last_out = &cl->next;
|
|
|
506
|
|
|
507 ctx->redo = 1;
|
|
|
508
|
|
|
509 continue;
|
|
|
510 }
|
|
|
511
|
|
|
512 ctx->redo = 0;
|
|
|
513
|
|
|
514 if (ctx->flush == Z_SYNC_FLUSH) {
|
|
|
515
|
|
58
|
516 ctx->zstream.avail_out = 0;
|
|
|
517 ctx->out_buf->flush = 1;
|
|
50
|
518 ctx->flush = Z_NO_FLUSH;
|
|
|
519
|
|
|
520 cl = ngx_alloc_chain_link(r->pool);
|
|
|
521 if (cl == NULL) {
|
|
|
522 ngx_http_gzip_error(ctx);
|
|
|
523 return NGX_ERROR;
|
|
|
524 }
|
|
|
525
|
|
|
526 cl->buf = ctx->out_buf;
|
|
|
527 cl->next = NULL;
|
|
|
528 *ctx->last_out = cl;
|
|
|
529 ctx->last_out = &cl->next;
|
|
|
530
|
|
|
531 break;
|
|
|
532 }
|
|
|
533
|
|
|
534 if (rc == Z_STREAM_END) {
|
|
|
535
|
|
|
536 ctx->zin = ctx->zstream.total_in;
|
|
|
537 ctx->zout = 10 + ctx->zstream.total_out + 8;
|
|
|
538
|
|
|
539 rc = deflateEnd(&ctx->zstream);
|
|
|
540
|
|
|
541 if (rc != Z_OK) {
|
|
|
542 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
|
|
|
543 "deflateEnd() failed: %d", rc);
|
|
|
544 ngx_http_gzip_error(ctx);
|
|
|
545 return NGX_ERROR;
|
|
|
546 }
|
|
|
547
|
|
|
548 ngx_pfree(r->pool, ctx->preallocated);
|
|
|
549
|
|
|
550 cl = ngx_alloc_chain_link(r->pool);
|
|
|
551 if (cl == NULL) {
|
|
|
552 ngx_http_gzip_error(ctx);
|
|
|
553 return NGX_ERROR;
|
|
|
554 }
|
|
|
555
|
|
|
556 cl->buf = ctx->out_buf;
|
|
|
557 cl->next = NULL;
|
|
|
558 *ctx->last_out = cl;
|
|
|
559 ctx->last_out = &cl->next;
|
|
|
560
|
|
|
561 if (ctx->zstream.avail_out >= 8) {
|
|
|
562 trailer = (struct gztrailer *) ctx->out_buf->last;
|
|
|
563 ctx->out_buf->last += 8;
|
|
|
564 ctx->out_buf->last_buf = 1;
|
|
|
565
|
|
|
566 } else {
|
|
|
567 b = ngx_create_temp_buf(r->pool, 8);
|
|
|
568 if (b == NULL) {
|
|
|
569 ngx_http_gzip_error(ctx);
|
|
|
570 return NGX_ERROR;
|
|
|
571 }
|
|
|
572
|
|
|
573 b->last_buf = 1;
|
|
|
574
|
|
|
575 cl = ngx_alloc_chain_link(r->pool);
|
|
|
576 if (cl == NULL) {
|
|
|
577 ngx_http_gzip_error(ctx);
|
|
|
578 return NGX_ERROR;
|
|
|
579 }
|
|
|
580
|
|
|
581 cl->buf = b;
|
|
|
582 cl->next = NULL;
|
|
|
583 *ctx->last_out = cl;
|
|
|
584 ctx->last_out = &cl->next;
|
|
|
585 trailer = (struct gztrailer *) b->pos;
|
|
|
586 b->last += 8;
|
|
|
587 }
|
|
|
588
|
|
|
589 #if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)
|
|
|
590
|
|
|
591 trailer->crc32 = ctx->crc32;
|
|
|
592 trailer->zlen = ctx->zin;
|
|
|
593
|
|
|
594 #else
|
|
|
595 trailer->crc32[0] = (u_char) (ctx->crc32 & 0xff);
|
|
|
596 trailer->crc32[1] = (u_char) ((ctx->crc32 >> 8) & 0xff);
|
|
|
597 trailer->crc32[2] = (u_char) ((ctx->crc32 >> 16) & 0xff);
|
|
|
598 trailer->crc32[3] = (u_char) ((ctx->crc32 >> 24) & 0xff);
|
|
|
599
|
|
|
600 trailer->zlen[0] = (u_char) (ctx->zin & 0xff);
|
|
|
601 trailer->zlen[1] = (u_char) ((ctx->zin >> 8) & 0xff);
|
|
|
602 trailer->zlen[2] = (u_char) ((ctx->zin >> 16) & 0xff);
|
|
|
603 trailer->zlen[3] = (u_char) ((ctx->zin >> 24) & 0xff);
|
|
|
604 #endif
|
|
|
605
|
|
|
606 ctx->zstream.avail_in = 0;
|
|
|
607 ctx->zstream.avail_out = 0;
|
|
|
608
|
|
|
609 ctx->done = 1;
|
|
|
610
|
|
146
|
611 r->connection->buffered &= ~NGX_HTTP_GZIP_BUFFERED;
|
|
|
612
|
|
50
|
613 break;
|
|
|
614 }
|
|
|
615
|
|
|
616 if (conf->no_buffer && ctx->in == NULL) {
|
|
|
617
|
|
|
618 cl = ngx_alloc_chain_link(r->pool);
|
|
|
619 if (cl == NULL) {
|
|
|
620 ngx_http_gzip_error(ctx);
|
|
|
621 return NGX_ERROR;
|
|
|
622 }
|
|
|
623
|
|
|
624 cl->buf = ctx->out_buf;
|
|
|
625 cl->next = NULL;
|
|
|
626 *ctx->last_out = cl;
|
|
|
627 ctx->last_out = &cl->next;
|
|
|
628
|
|
|
629 break;
|
|
|
630 }
|
|
|
631 }
|
|
|
632
|
|
346
|
633 if (ctx->out == NULL) {
|
|
50
|
634
|
|
346
|
635 if (last == NGX_AGAIN) {
|
|
|
636 return NGX_AGAIN;
|
|
|
637 }
|
|
|
638
|
|
|
639 if (ctx->busy == NULL) {
|
|
|
640 return NGX_OK;
|
|
|
641 }
|
|
50
|
642 }
|
|
|
643
|
|
|
644 last = ngx_http_next_body_filter(r, ctx->out);
|
|
|
645
|
|
|
646 /*
|
|
|
647 * we do not check NGX_AGAIN here because the downstream filters
|
|
|
648 * may free some buffers and zlib may compress some data into them
|
|
|
649 */
|
|
|
650
|
|
|
651 if (last == NGX_ERROR) {
|
|
|
652 ngx_http_gzip_error(ctx);
|
|
|
653 return NGX_ERROR;
|
|
|
654 }
|
|
|
655
|
|
|
656 ngx_chain_update_chains(&ctx->free, &ctx->busy, &ctx->out,
|
|
|
657 (ngx_buf_tag_t) &ngx_http_gzip_filter_module);
|
|
|
658 ctx->last_out = &ctx->out;
|
|
|
659
|
|
|
660 if (ctx->done) {
|
|
|
661 return last;
|
|
|
662 }
|
|
|
663 }
|
|
|
664 }
|
|
|
665
|
|
|
666
|
|
|
667 static void *
|
|
|
668 ngx_http_gzip_filter_alloc(void *opaque, u_int items, u_int size)
|
|
|
669 {
|
|
|
670 ngx_http_gzip_ctx_t *ctx = opaque;
|
|
|
671
|
|
|
672 void *p;
|
|
|
673 ngx_uint_t alloc;
|
|
|
674
|
|
|
675 alloc = items * size;
|
|
|
676
|
|
|
677 if (alloc % 512 != 0) {
|
|
|
678
|
|
|
679 /*
|
|
|
680 * The zlib deflate_state allocation, it takes about 6K,
|
|
|
681 * we allocate 8K. Other allocations are divisible by 512.
|
|
|
682 */
|
|
|
683
|
|
|
684 alloc = (alloc + ngx_pagesize - 1) & ~(ngx_pagesize - 1);
|
|
|
685 }
|
|
|
686
|
|
|
687 if (alloc <= ctx->allocated) {
|
|
|
688 p = ctx->free_mem;
|
|
|
689 ctx->free_mem += alloc;
|
|
|
690 ctx->allocated -= alloc;
|
|
|
691
|
|
|
692 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0,
|
|
|
693 "gzip alloc: n:%ud s:%ud a:%ud p:%p",
|
|
|
694 items, size, alloc, p);
|
|
|
695
|
|
|
696 return p;
|
|
|
697 }
|
|
|
698
|
|
|
699 ngx_log_error(NGX_LOG_ALERT, ctx->request->connection->log, 0,
|
|
|
700 "gzip filter failed to use preallocated memory: %ud of %ud",
|
|
|
701 items * size, ctx->allocated);
|
|
|
702
|
|
|
703 p = ngx_palloc(ctx->request->pool, items * size);
|
|
|
704
|
|
|
705 return p;
|
|
|
706 }
|
|
|
707
|
|
|
708
|
|
|
709 static void
|
|
|
710 ngx_http_gzip_filter_free(void *opaque, void *address)
|
|
|
711 {
|
|
|
712 #if 0
|
|
|
713 ngx_http_gzip_ctx_t *ctx = opaque;
|
|
|
714
|
|
|
715 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0,
|
|
|
716 "gzip free: %p", address);
|
|
|
717 #endif
|
|
|
718 }
|
|
|
719
|
|
|
720
|
|
|
721 static void
|
|
|
722 ngx_http_gzip_error(ngx_http_gzip_ctx_t *ctx)
|
|
|
723 {
|
|
|
724 deflateEnd(&ctx->zstream);
|
|
|
725
|
|
|
726 if (ctx->preallocated) {
|
|
|
727 ngx_pfree(ctx->request->pool, ctx->preallocated);
|
|
|
728 }
|
|
|
729
|
|
|
730 ctx->zstream.avail_in = 0;
|
|
|
731 ctx->zstream.avail_out = 0;
|
|
|
732
|
|
|
733 ctx->done = 1;
|
|
|
734
|
|
|
735 return;
|
|
|
736 }
|
|
|
737
|
|
|
738
|
|
|
739 static ngx_int_t
|
|
122
|
740 ngx_http_gzip_add_variables(ngx_conf_t *cf)
|
|
50
|
741 {
|
|
260
|
742 ngx_http_variable_t *var;
|
|
50
|
743
|
|
132
|
744 var = ngx_http_add_variable(cf, &ngx_http_gzip_ratio, NGX_HTTP_VAR_NOHASH);
|
|
122
|
745 if (var == NULL) {
|
|
|
746 return NGX_ERROR;
|
|
|
747 }
|
|
|
748
|
|
186
|
749 var->get_handler = ngx_http_gzip_ratio_variable;
|
|
122
|
750
|
|
50
|
751 return NGX_OK;
|
|
|
752 }
|
|
|
753
|
|
|
754
|
|
|
755 static ngx_int_t
|
|
122
|
756 ngx_http_gzip_ratio_variable(ngx_http_request_t *r,
|
|
|
757 ngx_http_variable_value_t *v, uintptr_t data)
|
|
|
758 {
|
|
|
759 ngx_uint_t zint, zfrac;
|
|
|
760 ngx_http_gzip_ctx_t *ctx;
|
|
|
761
|
|
126
|
762 v->valid = 1;
|
|
340
|
763 v->no_cacheable = 0;
|
|
122
|
764 v->not_found = 0;
|
|
|
765
|
|
|
766 ctx = ngx_http_get_module_ctx(r, ngx_http_gzip_filter_module);
|
|
|
767
|
|
|
768 if (ctx == NULL || ctx->zout == 0) {
|
|
|
769 v->not_found = 1;
|
|
|
770 return NGX_OK;
|
|
|
771 }
|
|
|
772
|
|
382
|
773 v->data = ngx_pnalloc(r->pool, NGX_INT32_LEN + 3);
|
|
122
|
774 if (v->data == NULL) {
|
|
|
775 return NGX_ERROR;
|
|
|
776 }
|
|
|
777
|
|
|
778 zint = (ngx_uint_t) (ctx->zin / ctx->zout);
|
|
|
779 zfrac = (ngx_uint_t) ((ctx->zin * 100 / ctx->zout) % 100);
|
|
|
780
|
|
|
781 if ((ctx->zin * 1000 / ctx->zout) % 10 > 4) {
|
|
|
782
|
|
|
783 /* the rounding, e.g., 2.125 to 2.13 */
|
|
|
784
|
|
|
785 zfrac++;
|
|
|
786
|
|
|
787 if (zfrac > 99) {
|
|
|
788 zint++;
|
|
|
789 zfrac = 0;
|
|
|
790 }
|
|
|
791 }
|
|
|
792
|
|
|
793 v->len = ngx_sprintf(v->data, "%ui.%02ui", zint, zfrac) - v->data;
|
|
|
794
|
|
|
795 return NGX_OK;
|
|
|
796 }
|
|
|
797
|
|
|
798
|
|
50
|
799 static void *
|
|
|
800 ngx_http_gzip_create_conf(ngx_conf_t *cf)
|
|
|
801 {
|
|
|
802 ngx_http_gzip_conf_t *conf;
|
|
|
803
|
|
|
804 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_gzip_conf_t));
|
|
|
805 if (conf == NULL) {
|
|
|
806 return NGX_CONF_ERROR;
|
|
|
807 }
|
|
|
808
|
|
|
809 /*
|
|
|
810 * set by ngx_pcalloc():
|
|
|
811 *
|
|
|
812 * conf->bufs.num = 0;
|
|
394
|
813 * conf->types = { NULL };
|
|
|
814 * conf->types_keys = NULL;
|
|
50
|
815 */
|
|
|
816
|
|
|
817 conf->enable = NGX_CONF_UNSET;
|
|
|
818 conf->no_buffer = NGX_CONF_UNSET;
|
|
|
819
|
|
|
820 conf->level = NGX_CONF_UNSET;
|
|
|
821 conf->wbits = (size_t) NGX_CONF_UNSET;
|
|
|
822 conf->memlevel = (size_t) NGX_CONF_UNSET;
|
|
|
823 conf->min_length = NGX_CONF_UNSET;
|
|
|
824
|
|
|
825 return conf;
|
|
|
826 }
|
|
|
827
|
|
|
828
|
|
|
829 static char *
|
|
|
830 ngx_http_gzip_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
831 {
|
|
|
832 ngx_http_gzip_conf_t *prev = parent;
|
|
|
833 ngx_http_gzip_conf_t *conf = child;
|
|
|
834
|
|
|
835 ngx_conf_merge_value(conf->enable, prev->enable, 0);
|
|
|
836
|
|
|
837 ngx_conf_merge_bufs_value(conf->bufs, prev->bufs, 4, ngx_pagesize);
|
|
|
838
|
|
|
839 ngx_conf_merge_value(conf->level, prev->level, 1);
|
|
|
840 ngx_conf_merge_size_value(conf->wbits, prev->wbits, MAX_WBITS);
|
|
|
841 ngx_conf_merge_size_value(conf->memlevel, prev->memlevel,
|
|
|
842 MAX_MEM_LEVEL - 1);
|
|
126
|
843 ngx_conf_merge_value(conf->min_length, prev->min_length, 20);
|
|
50
|
844 ngx_conf_merge_value(conf->no_buffer, prev->no_buffer, 0);
|
|
|
845
|
|
394
|
846 if (ngx_http_merge_types(cf, conf->types_keys, &conf->types,
|
|
|
847 prev->types_keys, &prev->types,
|
|
|
848 ngx_http_html_default_types)
|
|
|
849 != NGX_OK)
|
|
|
850 {
|
|
|
851 return NGX_CONF_ERROR;
|
|
50
|
852 }
|
|
|
853
|
|
|
854 return NGX_CONF_OK;
|
|
|
855 }
|
|
|
856
|
|
|
857
|
|
230
|
858 static ngx_int_t
|
|
|
859 ngx_http_gzip_filter_init(ngx_conf_t *cf)
|
|
|
860 {
|
|
|
861 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
862 ngx_http_top_header_filter = ngx_http_gzip_header_filter;
|
|
|
863
|
|
|
864 ngx_http_next_body_filter = ngx_http_top_body_filter;
|
|
|
865 ngx_http_top_body_filter = ngx_http_gzip_body_filter;
|
|
|
866
|
|
|
867 return NGX_OK;
|
|
|
868 }
|
|
|
869
|
|
|
870
|
|
50
|
871 static char *
|
|
76
|
872 ngx_http_gzip_window(ngx_conf_t *cf, void *post, void *data)
|
|
50
|
873 {
|
|
|
874 int *np = data;
|
|
|
875
|
|
|
876 int wbits, wsize;
|
|
|
877
|
|
|
878 wbits = 15;
|
|
|
879
|
|
|
880 for (wsize = 32 * 1024; wsize > 256; wsize >>= 1) {
|
|
|
881
|
|
|
882 if (wsize == *np) {
|
|
|
883 *np = wbits;
|
|
|
884
|
|
|
885 return NGX_CONF_OK;
|
|
|
886 }
|
|
|
887
|
|
|
888 wbits--;
|
|
|
889 }
|
|
|
890
|
|
|
891 return "must be 512, 1k, 2k, 4k, 8k, 16k, or 32k";
|
|
|
892 }
|
|
|
893
|
|
|
894
|
|
|
895 static char *
|
|
76
|
896 ngx_http_gzip_hash(ngx_conf_t *cf, void *post, void *data)
|
|
50
|
897 {
|
|
|
898 int *np = data;
|
|
|
899
|
|
|
900 int memlevel, hsize;
|
|
|
901
|
|
|
902 memlevel = 9;
|
|
|
903
|
|
|
904 for (hsize = 128 * 1024; hsize > 256; hsize >>= 1) {
|
|
|
905
|
|
|
906 if (hsize == *np) {
|
|
|
907 *np = memlevel;
|
|
|
908
|
|
|
909 return NGX_CONF_OK;
|
|
|
910 }
|
|
|
911
|
|
|
912 memlevel--;
|
|
|
913 }
|
|
|
914
|
|
|
915 return "must be 512, 1k, 2k, 4k, 8k, 16k, 32k, 64k, or 128k";
|
|
|
916 }
|
