1 /* 2 This file is part of libmicrospdy 3 Copyright Copyright (C) 2012 Andrey Uzunov 4 5 This program is free software: you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation, either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 /** 20 * @file compression.c 21 * @brief zlib handling functions 22 * @author Andrey Uzunov 23 */ 24 25 #include "platform.h" 26 #include "structures.h" 27 #include "internal.h" 28 #include "compression.h" 29 30 /* spdy ver 3 specific dictionary used by zlib */ 31 static const unsigned char 32 spdyf_zlib_dictionary[] = { 33 0x00, 0x00, 0x00, 0x07, 0x6f, 0x70, 0x74, 0x69, // - - - - o p t i 34 0x6f, 0x6e, 0x73, 0x00, 0x00, 0x00, 0x04, 0x68, // o n s - - - - h 35 0x65, 0x61, 0x64, 0x00, 0x00, 0x00, 0x04, 0x70, // e a d - - - - p 36 0x6f, 0x73, 0x74, 0x00, 0x00, 0x00, 0x03, 0x70, // o s t - - - - p 37 0x75, 0x74, 0x00, 0x00, 0x00, 0x06, 0x64, 0x65, // u t - - - - d e 38 0x6c, 0x65, 0x74, 0x65, 0x00, 0x00, 0x00, 0x05, // l e t e - - - - 39 0x74, 0x72, 0x61, 0x63, 0x65, 0x00, 0x00, 0x00, // t r a c e - - - 40 0x06, 0x61, 0x63, 0x63, 0x65, 0x70, 0x74, 0x00, // - a c c e p t - 41 0x00, 0x00, 0x0e, 0x61, 0x63, 0x63, 0x65, 0x70, // - - - a c c e p 42 0x74, 0x2d, 0x63, 0x68, 0x61, 0x72, 0x73, 0x65, // t - c h a r s e 43 0x74, 0x00, 0x00, 0x00, 0x0f, 0x61, 0x63, 0x63, // t - - - - a c c 44 0x65, 0x70, 0x74, 0x2d, 0x65, 0x6e, 0x63, 0x6f, // e p t - e n c o 45 0x64, 0x69, 0x6e, 0x67, 0x00, 0x00, 0x00, 0x0f, // d i n g - - - - 46 0x61, 0x63, 0x63, 0x65, 0x70, 0x74, 0x2d, 0x6c, // a c c e p t - l 47 0x61, 0x6e, 0x67, 0x75, 0x61, 0x67, 0x65, 0x00, // a n g u a g e - 48 0x00, 0x00, 0x0d, 0x61, 0x63, 0x63, 0x65, 0x70, // - - - a c c e p 49 0x74, 0x2d, 0x72, 0x61, 0x6e, 0x67, 0x65, 0x73, // t - r a n g e s 50 0x00, 0x00, 0x00, 0x03, 0x61, 0x67, 0x65, 0x00, // - - - - a g e - 51 0x00, 0x00, 0x05, 0x61, 0x6c, 0x6c, 0x6f, 0x77, // - - - a l l o w 52 0x00, 0x00, 0x00, 0x0d, 0x61, 0x75, 0x74, 0x68, // - - - - a u t h 53 0x6f, 0x72, 0x69, 0x7a, 0x61, 0x74, 0x69, 0x6f, // o r i z a t i o 54 0x6e, 0x00, 0x00, 0x00, 0x0d, 0x63, 0x61, 0x63, // n - - - - c a c 55 0x68, 0x65, 0x2d, 0x63, 0x6f, 0x6e, 0x74, 0x72, // h e - c o n t r 56 0x6f, 0x6c, 0x00, 0x00, 0x00, 0x0a, 0x63, 0x6f, // o l - - - - c o 57 0x6e, 0x6e, 0x65, 0x63, 0x74, 0x69, 0x6f, 0x6e, // n n e c t i o n 58 0x00, 0x00, 0x00, 0x0c, 0x63, 0x6f, 0x6e, 0x74, // - 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r a n g e - - 74 0x00, 0x0c, 0x63, 0x6f, 0x6e, 0x74, 0x65, 0x6e, // - - c o n t e n 75 0x74, 0x2d, 0x74, 0x79, 0x70, 0x65, 0x00, 0x00, // t - t y p e - - 76 0x00, 0x04, 0x64, 0x61, 0x74, 0x65, 0x00, 0x00, // - - d a t e - - 77 0x00, 0x04, 0x65, 0x74, 0x61, 0x67, 0x00, 0x00, // - - e t a g - - 78 0x00, 0x06, 0x65, 0x78, 0x70, 0x65, 0x63, 0x74, // - - e x p e c t 79 0x00, 0x00, 0x00, 0x07, 0x65, 0x78, 0x70, 0x69, // - - - - e x p i 80 0x72, 0x65, 0x73, 0x00, 0x00, 0x00, 0x04, 0x66, // r e s - - - - f 81 0x72, 0x6f, 0x6d, 0x00, 0x00, 0x00, 0x04, 0x68, // r o m - - - - h 82 0x6f, 0x73, 0x74, 0x00, 0x00, 0x00, 0x08, 0x69, // o s t - - - - i 83 0x66, 0x2d, 0x6d, 0x61, 0x74, 0x63, 0x68, 0x00, // f - m a t c h - 84 0x00, 0x00, 0x11, 0x69, 0x66, 0x2d, 0x6d, 0x6f, // - - - i f - m o 85 0x64, 0x69, 0x66, 0x69, 0x65, 0x64, 0x2d, 0x73, // d i f i e d - s 86 0x69, 0x6e, 0x63, 0x65, 0x00, 0x00, 0x00, 0x0d, // i n c e - - - - 87 0x69, 0x66, 0x2d, 0x6e, 0x6f, 0x6e, 0x65, 0x2d, // i f - n o n e - 88 0x6d, 0x61, 0x74, 0x63, 0x68, 0x00, 0x00, 0x00, // m a t c h - 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p r o x y - a 104 0x75, 0x74, 0x68, 0x6f, 0x72, 0x69, 0x7a, 0x61, // u t h o r i z a 105 0x74, 0x69, 0x6f, 0x6e, 0x00, 0x00, 0x00, 0x05, // t i o n - - - - 106 0x72, 0x61, 0x6e, 0x67, 0x65, 0x00, 0x00, 0x00, // r a n g e - - - 107 0x07, 0x72, 0x65, 0x66, 0x65, 0x72, 0x65, 0x72, // - r e f e r e r 108 0x00, 0x00, 0x00, 0x0b, 0x72, 0x65, 0x74, 0x72, // - - - - r e t r 109 0x79, 0x2d, 0x61, 0x66, 0x74, 0x65, 0x72, 0x00, // y - a f t e r - 110 0x00, 0x00, 0x06, 0x73, 0x65, 0x72, 0x76, 0x65, // - - - s e r v e 111 0x72, 0x00, 0x00, 0x00, 0x02, 0x74, 0x65, 0x00, // r - - - - t e - 112 0x00, 0x00, 0x07, 0x74, 0x72, 0x61, 0x69, 0x6c, // - - - t r a i l 113 0x65, 0x72, 0x00, 0x00, 0x00, 0x11, 0x74, 0x72, // e r - - - - t r 114 0x61, 0x6e, 0x73, 0x66, 0x65, 0x72, 0x2d, 0x65, // a n s f e r - e 115 0x6e, 0x63, 0x6f, 0x64, 0x69, 0x6e, 0x67, 0x00, // n c o d i n g - 116 0x00, 0x00, 0x07, 0x75, 0x70, 0x67, 0x72, 0x61, // - - - u p g r a 117 0x64, 0x65, 0x00, 0x00, 0x00, 0x0a, 0x75, 0x73, // d e - - - 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1 - - - - u r 133 0x6c, 0x00, 0x00, 0x00, 0x06, 0x70, 0x75, 0x62, // l - - - - p u b 134 0x6c, 0x69, 0x63, 0x00, 0x00, 0x00, 0x0a, 0x73, // l i c - - - - s 135 0x65, 0x74, 0x2d, 0x63, 0x6f, 0x6f, 0x6b, 0x69, // e t - c o o k i 136 0x65, 0x00, 0x00, 0x00, 0x0a, 0x6b, 0x65, 0x65, // e - - - - k e e 137 0x70, 0x2d, 0x61, 0x6c, 0x69, 0x76, 0x65, 0x00, // p - a l i v e - 138 0x00, 0x00, 0x06, 0x6f, 0x72, 0x69, 0x67, 0x69, // - - - o r i g i 139 0x6e, 0x31, 0x30, 0x30, 0x31, 0x30, 0x31, 0x32, // n 1 0 0 1 0 1 2 140 0x30, 0x31, 0x32, 0x30, 0x32, 0x32, 0x30, 0x35, // 0 1 2 0 2 2 0 5 141 0x32, 0x30, 0x36, 0x33, 0x30, 0x30, 0x33, 0x30, // 2 0 6 3 0 0 3 0 142 0x32, 0x33, 0x30, 0x33, 0x33, 0x30, 0x34, 0x33, // 2 3 0 3 3 0 4 3 143 0x30, 0x35, 0x33, 0x30, 0x36, 0x33, 0x30, 0x37, // 0 5 3 0 6 3 0 7 144 0x34, 0x30, 0x32, 0x34, 0x30, 0x35, 0x34, 0x30, // 4 0 2 4 0 5 4 0 145 0x36, 0x34, 0x30, 0x37, 0x34, 0x30, 0x38, 0x34, // 6 4 0 7 4 0 8 4 146 0x30, 0x39, 0x34, 0x31, 0x30, 0x34, 0x31, 0x31, // 0 9 4 1 0 4 1 1 147 0x34, 0x31, 0x32, 0x34, 0x31, 0x33, 0x34, 0x31, // 4 1 2 4 1 3 4 1 148 0x34, 0x34, 0x31, 0x35, 0x34, 0x31, 0x36, 0x34, // 4 4 1 5 4 1 6 4 149 0x31, 0x37, 0x35, 0x30, 0x32, 0x35, 0x30, 0x34, // 1 7 5 0 2 5 0 4 150 0x35, 0x30, 0x35, 0x32, 0x30, 0x33, 0x20, 0x4e, // 5 0 5 2 0 3 - N 151 0x6f, 0x6e, 0x2d, 0x41, 0x75, 0x74, 0x68, 0x6f, // o n - A u t h o 152 0x72, 0x69, 0x74, 0x61, 0x74, 0x69, 0x76, 0x65, // r i t a t i v e 153 0x20, 0x49, 0x6e, 0x66, 0x6f, 0x72, 0x6d, 0x61, // - I n f o r m a 154 0x74, 0x69, 0x6f, 0x6e, 0x32, 0x30, 0x34, 0x20, // t i o n 2 0 4 - 155 0x4e, 0x6f, 0x20, 0x43, 0x6f, 0x6e, 0x74, 0x65, // N o - C o n t e 156 0x6e, 0x74, 0x33, 0x30, 0x31, 0x20, 0x4d, 0x6f, // n t 3 0 1 - M o 157 0x76, 0x65, 0x64, 0x20, 0x50, 0x65, 0x72, 0x6d, // v e d - P e r m 158 0x61, 0x6e, 0x65, 0x6e, 0x74, 0x6c, 0x79, 0x34, // a n e n t l y 4 159 0x30, 0x30, 0x20, 0x42, 0x61, 0x64, 0x20, 0x52, // 0 0 - B a d - R 160 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x34, 0x30, // e q u e s t 4 0 161 0x31, 0x20, 0x55, 0x6e, 0x61, 0x75, 0x74, 0x68, // 1 - U n a u t h 162 0x6f, 0x72, 0x69, 0x7a, 0x65, 0x64, 0x34, 0x30, // o r i z e d 4 0 163 0x33, 0x20, 0x46, 0x6f, 0x72, 0x62, 0x69, 0x64, // 3 - F o r b i d 164 0x64, 0x65, 0x6e, 0x34, 0x30, 0x34, 0x20, 0x4e, // d e n 4 0 4 - N 165 0x6f, 0x74, 0x20, 0x46, 0x6f, 0x75, 0x6e, 0x64, // o t - F o u n d 166 0x35, 0x30, 0x30, 0x20, 0x49, 0x6e, 0x74, 0x65, // 5 0 0 - I n t e 167 0x72, 0x6e, 0x61, 0x6c, 0x20, 0x53, 0x65, 0x72, // r n a l - S e r 168 0x76, 0x65, 0x72, 0x20, 0x45, 0x72, 0x72, 0x6f, // v e r - E r r o 169 0x72, 0x35, 0x30, 0x31, 0x20, 0x4e, 0x6f, 0x74, // r 5 0 1 - N o t 170 0x20, 0x49, 0x6d, 0x70, 0x6c, 0x65, 0x6d, 0x65, // - I m p l e m e 171 0x6e, 0x74, 0x65, 0x64, 0x35, 0x30, 0x33, 0x20, // n t e d 5 0 3 - 172 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x20, // S e r v i c e - 173 0x55, 0x6e, 0x61, 0x76, 0x61, 0x69, 0x6c, 0x61, // U n a v a i l a 174 0x62, 0x6c, 0x65, 0x4a, 0x61, 0x6e, 0x20, 0x46, // b l e J a n - F 175 0x65, 0x62, 0x20, 0x4d, 0x61, 0x72, 0x20, 0x41, // e b - M a r - A 176 0x70, 0x72, 0x20, 0x4d, 0x61, 0x79, 0x20, 0x4a, // p r - M a y - J 177 0x75, 0x6e, 0x20, 0x4a, 0x75, 0x6c, 0x20, 0x41, // u n - J u l - A 178 0x75, 0x67, 0x20, 0x53, 0x65, 0x70, 0x74, 0x20, // u g - S e p t - 179 0x4f, 0x63, 0x74, 0x20, 0x4e, 0x6f, 0x76, 0x20, // O c t - N o v - 180 0x44, 0x65, 0x63, 0x20, 0x30, 0x30, 0x3a, 0x30, // D e c - 0 0 - 0 181 0x30, 0x3a, 0x30, 0x30, 0x20, 0x4d, 0x6f, 0x6e, // 0 - 0 0 - M o n 182 0x2c, 0x20, 0x54, 0x75, 0x65, 0x2c, 0x20, 0x57, // - - T u e - - W 183 0x65, 0x64, 0x2c, 0x20, 0x54, 0x68, 0x75, 0x2c, // e d - - T h u - 184 0x20, 0x46, 0x72, 0x69, 0x2c, 0x20, 0x53, 0x61, // - F r i - - S a 185 0x74, 0x2c, 0x20, 0x53, 0x75, 0x6e, 0x2c, 0x20, // t - - S u n - - 186 0x47, 0x4d, 0x54, 0x63, 0x68, 0x75, 0x6e, 0x6b, // G M T c h u n k 187 0x65, 0x64, 0x2c, 0x74, 0x65, 0x78, 0x74, 0x2f, // e d - t e x t - 188 0x68, 0x74, 0x6d, 0x6c, 0x2c, 0x69, 0x6d, 0x61, // h t m l - i m a 189 0x67, 0x65, 0x2f, 0x70, 0x6e, 0x67, 0x2c, 0x69, // g e - p n g - i 190 0x6d, 0x61, 0x67, 0x65, 0x2f, 0x6a, 0x70, 0x67, // m a g e - j p g 191 0x2c, 0x69, 0x6d, 0x61, 0x67, 0x65, 0x2f, 0x67, // - i m a g e - g 192 0x69, 0x66, 0x2c, 0x61, 0x70, 0x70, 0x6c, 0x69, // i f - a p p l i 193 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x2f, 0x78, // c a t i o n - x 194 0x6d, 0x6c, 0x2c, 0x61, 0x70, 0x70, 0x6c, 0x69, // m l - a p p l i 195 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x2f, 0x78, // c a t i o n - x 196 0x68, 0x74, 0x6d, 0x6c, 0x2b, 0x78, 0x6d, 0x6c, // h t m l - x m l 197 0x2c, 0x74, 0x65, 0x78, 0x74, 0x2f, 0x70, 0x6c, // - t e x t - p l 198 0x61, 0x69, 0x6e, 0x2c, 0x74, 0x65, 0x78, 0x74, // a i n - t e x t 199 0x2f, 0x6a, 0x61, 0x76, 0x61, 0x73, 0x63, 0x72, // - j a v a s c r 200 0x69, 0x70, 0x74, 0x2c, 0x70, 0x75, 0x62, 0x6c, // i p t - p u b l 201 0x69, 0x63, 0x70, 0x72, 0x69, 0x76, 0x61, 0x74, // i c p r i v a t 202 0x65, 0x6d, 0x61, 0x78, 0x2d, 0x61, 0x67, 0x65, // e m a x - a g e 203 0x3d, 0x67, 0x7a, 0x69, 0x70, 0x2c, 0x64, 0x65, // - g z i p - d e 204 0x66, 0x6c, 0x61, 0x74, 0x65, 0x2c, 0x73, 0x64, // f l a t e - s d 205 0x63, 0x68, 0x63, 0x68, 0x61, 0x72, 0x73, 0x65, // c h c h a r s e 206 0x74, 0x3d, 0x75, 0x74, 0x66, 0x2d, 0x38, 0x63, // t - u t f - 8 c 207 0x68, 0x61, 0x72, 0x73, 0x65, 0x74, 0x3d, 0x69, // h a r s e t - i 208 0x73, 0x6f, 0x2d, 0x38, 0x38, 0x35, 0x39, 0x2d, // s o - 8 8 5 9 - 209 0x31, 0x2c, 0x75, 0x74, 0x66, 0x2d, 0x2c, 0x2a, // 1 - u t f - - - 210 0x2c, 0x65, 0x6e, 0x71, 0x3d, 0x30, 0x2e // - e n q - 0 - 211 }; 212 213 214 int 215 SPDYF_zlib_deflate_init(z_stream *strm) 216 { 217 int ret; 218 219 strm->zalloc = Z_NULL; 220 strm->zfree = Z_NULL; 221 strm->opaque = Z_NULL; 222 //the second argument is "level of compression" 223 //use 0 for no compression; 9 for best compression 224 ret = deflateInit(strm, Z_DEFAULT_COMPRESSION); 225 if(ret != Z_OK) 226 { 227 SPDYF_DEBUG("deflate init"); 228 return SPDY_NO; 229 } 230 ret = deflateSetDictionary(strm, 231 spdyf_zlib_dictionary, 232 sizeof(spdyf_zlib_dictionary)); 233 if(ret != Z_OK) 234 { 235 SPDYF_DEBUG("deflate set dict"); 236 deflateEnd(strm); 237 return SPDY_NO; 238 } 239 return SPDY_YES; 240 } 241 242 243 void 244 SPDYF_zlib_deflate_end(z_stream *strm) 245 { 246 deflateEnd(strm); 247 } 248 249 int 250 SPDYF_zlib_deflate(z_stream *strm, 251 const void *src, 252 size_t src_size, 253 size_t *data_used, 254 void **dest, 255 size_t *dest_size) 256 { 257 int ret; 258 int flush; 259 unsigned int have; 260 Bytef out[SPDYF_ZLIB_CHUNK]; 261 262 *dest = NULL; 263 *dest_size = 0; 264 265 do 266 { 267 /* check for big data bigger than the buffer used */ 268 if(src_size > SPDYF_ZLIB_CHUNK) 269 { 270 strm->avail_in = SPDYF_ZLIB_CHUNK; 271 src_size -= SPDYF_ZLIB_CHUNK; 272 /* flush is used for the loop to detect if we still 273 * need to supply additional 274 * data to the stream via avail_in and next_in. */ 275 flush = Z_NO_FLUSH; 276 } 277 else 278 { 279 strm->avail_in = src_size; 280 flush = Z_SYNC_FLUSH; 281 } 282 *data_used += strm->avail_in; 283 284 strm->next_in = (Bytef *)src; 285 286 /* Loop while output data is available */ 287 do 288 { 289 strm->avail_out = SPDYF_ZLIB_CHUNK; 290 strm->next_out = out; 291 292 /* No need to check return value of deflate. 293 * (See zlib documentation at http://www.zlib.net/zlib_how.html */ 294 ret = deflate(strm, flush); 295 have = SPDYF_ZLIB_CHUNK - strm->avail_out; 296 297 /* (Re)allocate memory for dest and keep track of it's size. */ 298 *dest_size += have; 299 *dest = realloc(*dest, *dest_size); 300 if(!*dest) 301 { 302 SPDYF_DEBUG("realloc data for result"); 303 deflateEnd(strm); 304 return SPDY_NO; 305 } 306 memcpy((*dest) + ((*dest_size) - have), out, have); 307 } 308 while(strm->avail_out == 0); 309 /* At this point, all of the input data should already 310 * have been used. */ 311 SPDYF_ASSERT(strm->avail_in == 0,"compressing bug"); 312 } 313 while(flush != Z_SYNC_FLUSH); 314 315 return Z_OK == ret ? SPDY_YES : SPDY_NO; 316 } 317 318 319 int 320 SPDYF_zlib_inflate_init(z_stream *strm) 321 { 322 int ret; 323 324 strm->zalloc = Z_NULL; 325 strm->zfree = Z_NULL; 326 strm->opaque = Z_NULL; 327 strm->avail_in = 0; 328 strm->next_in = Z_NULL; 329 //change 15 to lower value for performance and benchmark 330 //"The windowBits parameter is the base two logarithm of the 331 // maximum window size (the size of the history buffer)." 332 ret = inflateInit2(strm, 15); 333 if(ret != Z_OK) 334 { 335 SPDYF_DEBUG("Cannot inflateInit2 the stream"); 336 return SPDY_NO; 337 } 338 return SPDY_YES; 339 } 340 341 342 void 343 SPDYF_zlib_inflate_end(z_stream *strm) 344 { 345 inflateEnd(strm); 346 } 347 348 349 int 350 SPDYF_zlib_inflate(z_stream *strm, 351 const void *src, 352 size_t src_size, 353 void **dest, 354 size_t *dest_size) 355 { 356 int ret = Z_OK; 357 uint32_t have; 358 Bytef out[SPDYF_ZLIB_CHUNK]; 359 360 *dest = NULL; 361 *dest_size = 0; 362 363 /* decompress until deflate stream ends or end of file */ 364 do 365 { 366 if(src_size > SPDYF_ZLIB_CHUNK) 367 { 368 strm->avail_in = SPDYF_ZLIB_CHUNK; 369 src_size -= SPDYF_ZLIB_CHUNK; 370 } 371 else 372 { 373 strm->avail_in = src_size; 374 src_size = 0; 375 } 376 377 if(strm->avail_in == 0){ 378 //the loop breaks always here as the stream never ends 379 break; 380 } 381 382 strm->next_in = (Bytef *) src; 383 /* run inflate() on input until output buffer not full */ 384 do { 385 strm->avail_out = SPDYF_ZLIB_CHUNK; 386 strm->next_out = out; 387 ret = inflate(strm, Z_SYNC_FLUSH); 388 389 switch (ret) 390 { 391 case Z_STREAM_ERROR: 392 SPDYF_DEBUG("Error on inflate"); 393 //no inflateEnd here, same in zlib example 394 return SPDY_NO; 395 396 case Z_NEED_DICT: 397 ret = inflateSetDictionary(strm, 398 spdyf_zlib_dictionary, 399 sizeof(spdyf_zlib_dictionary)); 400 if(ret != Z_OK) 401 { 402 SPDYF_DEBUG("Error on inflateSetDictionary"); 403 inflateEnd(strm); 404 return SPDY_NO; 405 } 406 ret = inflate(strm, Z_SYNC_FLUSH); 407 if(Z_STREAM_ERROR == ret) 408 { 409 SPDYF_DEBUG("Error on inflate"); 410 return SPDY_NO; 411 } 412 break; 413 414 case Z_DATA_ERROR: 415 SPDYF_DEBUG("Z_DATA_ERROR"); 416 inflateEnd(strm); 417 return SPDY_NO; 418 419 case Z_MEM_ERROR: 420 SPDYF_DEBUG("Z_MEM_ERROR"); 421 inflateEnd(strm); 422 return SPDY_NO; 423 } 424 have = SPDYF_ZLIB_CHUNK - strm->avail_out; 425 *dest_size += have; 426 /* (re)alloc memory for the output buffer */ 427 *dest = realloc(*dest, *dest_size); 428 if(!*dest) 429 { 430 SPDYF_DEBUG("Cannot realloc memory"); 431 inflateEnd(strm); 432 return SPDY_NO; 433 } 434 memcpy((*dest) + ((*dest_size) - have), out, have); 435 } 436 while (0 == strm->avail_out); 437 } 438 while (Z_STREAM_END != ret); 439 440 return Z_OK == ret || Z_STREAM_END == ret ? SPDY_YES : SPDY_NO; 441 } 442
