git.m6w6.name Git - m6w6/ext-http/blob - http_encoding_api.c

   1 /*
   2     +--------------------------------------------------------------------+
   3     | PECL :: http                                                       |
   4     +--------------------------------------------------------------------+
   5     | Redistribution and use in source and binary forms, with or without |
   6     | modification, are permitted provided that the conditions mentioned |
   7     | in the accompanying LICENSE file are met.                          |
   8     +--------------------------------------------------------------------+
   9     | Copyright (c) 2004-2005, Michael Wallner <mike@php.net>            |
  10     +--------------------------------------------------------------------+
  11 */
  12
  13 /* $Id$ */
  14
  15 #ifdef HAVE_CONFIG_H
  16 #       include "config.h"
  17 #endif
  18
  19 #define HTTP_WANT_ZLIB
  20 #include "php_http.h"
  21
  22 #include "php_http_api.h"
  23 #include "php_http_encoding_api.h"
  24 #include "php_http_send_api.h"
  25 #include "php_http_headers_api.h"
  26
  27 ZEND_EXTERN_MODULE_GLOBALS(http);
  28
  29 static inline int eol_match(char **line, int *eol_len)
  30 {
  31         char *ptr = *line;
  32
  33         while (0x20 == *ptr) ++ptr;
  34
  35         if (ptr == http_locate_eol(*line, eol_len)) {
  36                 *line = ptr;
  37                 return 1;
  38         } else {
  39                 return 0;
  40         }
  41 }
  42
  43 /* {{{ char *http_encoding_dechunk(char *, size_t, char **, size_t *) */
  44 PHP_HTTP_API const char *_http_encoding_dechunk(const char *encoded, size_t encoded_len, char **decoded, size_t *decoded_len TSRMLS_DC)
  45 {
  46         int eol_len = 0;
  47         char *n_ptr = NULL;
  48         const char *e_ptr = encoded;
  49
  50         *decoded_len = 0;
  51         *decoded = ecalloc(1, encoded_len);
  52
  53         while ((encoded + encoded_len - e_ptr) > 0) {
  54                 ulong chunk_len = 0, rest;
  55
  56                 chunk_len = strtoul(e_ptr, &n_ptr, 16);
  57
  58                 /* we could not read in chunk size */
  59                 if (n_ptr == e_ptr) {
  60                         /*
  61                          * if this is the first turn and there doesn't seem to be a chunk
  62                          * size at the begining of the body, do not fail on apparently
  63                          * not encoded data and return a copy
  64                          */
  65                         if (e_ptr == encoded) {
  66                                 http_error(HE_NOTICE, HTTP_E_ENCODING, "Data does not seem to be chunked encoded");
  67                                 memcpy(*decoded, encoded, encoded_len);
  68                                 *decoded_len = encoded_len;
  69                                 return encoded + encoded_len;
  70                         } else {
  71                                 efree(*decoded);
  72                                 http_error_ex(HE_WARNING, HTTP_E_ENCODING, "Expected chunk size at pos %tu of %zu but got trash", n_ptr - encoded, encoded_len);
  73                                 return NULL;
  74                         }
  75                 }
  76
  77                 /* reached the end */
  78                 if (!chunk_len) {
  79                         /* move over '0' chunked encoding terminator */
  80                         while (*e_ptr == '0') ++e_ptr;
  81                         break;
  82                 }
  83
  84                 /* there should be CRLF after the chunk size, but we'll ignore SP+ too */
  85                 if (*n_ptr && !eol_match(&n_ptr, &eol_len)) {
  86                         if (eol_len == 2) {
  87                                 http_error_ex(HE_WARNING, HTTP_E_ENCODING, "Expected CRLF at pos %tu of %zu but got 0x%02X 0x%02X", n_ptr - encoded, encoded_len, *n_ptr, *(n_ptr + 1));
  88                         } else {
  89                                 http_error_ex(HE_WARNING, HTTP_E_ENCODING, "Expected LF at pos %tu of %zu but got 0x%02X", n_ptr - encoded, encoded_len, *n_ptr);
  90                         }
  91                 }
  92                 n_ptr += eol_len;
  93
  94                 /* chunk size pretends more data than we actually got, so it's probably a truncated message */
  95                 if (chunk_len > (rest = encoded + encoded_len - n_ptr)) {
  96                         http_error_ex(HE_WARNING, HTTP_E_ENCODING, "Truncated message: chunk size %lu exceeds remaining data size %lu at pos %tu of %zu", chunk_len, rest, n_ptr - encoded, encoded_len);
  97                         chunk_len = rest;
  98                 }
  99
 100                 /* copy the chunk */
 101                 memcpy(*decoded + *decoded_len, n_ptr, chunk_len);
 102                 *decoded_len += chunk_len;
 103
 104                 if (chunk_len == rest) {
 105                         e_ptr = n_ptr + chunk_len;
 106                         break;
 107                 } else {
 108                         /* advance to next chunk */
 109                         e_ptr = n_ptr + chunk_len + eol_len;
 110                 }
 111         }
 112
 113         return e_ptr;
 114 }
 115 /* }}} */
 116
 117 #ifdef HTTP_HAVE_ZLIB
 118
 119 static const char http_encoding_gzip_header[] = {
 120         (const char) 0x1f,                      // fixed value
 121         (const char) 0x8b,                      // fixed value
 122         (const char) Z_DEFLATED,        // compression algorithm
 123         (const char) 0,                         // none of the possible flags defined by the GZIP "RFC"
 124         (const char) 0,                         // MTIME
 125         (const char) 0,                         // =*=
 126         (const char) 0,                         // =*=
 127         (const char) 0,                         // =*=
 128         (const char) 0,                         // two possible flag values for 9 compression levels? o_O
 129 #ifdef PHP_WIN32
 130         (const char) 0x0b                       // OS_CODE
 131 #else
 132         (const char) 0x03                       // OS_CODE
 133 #endif
 134 };
 135
 136 PHP_HTTP_API STATUS _http_encoding_gzencode(int level, int mtime, const char *data, size_t data_len, char **encoded, size_t *encoded_len TSRMLS_DC)
 137 {
 138         z_stream Z;
 139         STATUS status = Z_OK;
 140
 141         if (!(data && data_len)) {
 142                 return FAILURE;
 143         }
 144
 145         *encoded = NULL;
 146         *encoded_len = 0;
 147         memset(&Z, 0, sizeof(z_stream));
 148
 149         Z.next_in   = (Bytef *) data;
 150         Z.avail_in  = data_len;
 151         Z.avail_out = HTTP_ENCODING_BUFLEN(data_len) + HTTP_ENCODING_SAFPAD - 1;
 152
 153         *encoded = emalloc(HTTP_ENCODING_BUFLEN(data_len) + sizeof(http_encoding_gzip_header) + HTTP_ENCODING_SAFPAD);
 154         memcpy(*encoded, http_encoding_gzip_header, sizeof(http_encoding_gzip_header));
 155
 156         if (mtime) {
 157                 (*encoded)[4] = (char) (mtime & 0xFF);
 158                 (*encoded)[5] = (char) ((mtime >> 8) & 0xFF);
 159                 (*encoded)[6] = (char) ((mtime >> 16) & 0xFF);
 160                 (*encoded)[7] = (char) ((mtime >> 24) & 0xFF);
 161         }
 162
 163         Z.next_out = (Bytef *) *encoded + sizeof(http_encoding_gzip_header);
 164
 165         if (Z_OK == (status = deflateInit2(&Z, level, Z_DEFLATED, -MAX_WBITS, MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY))) {
 166                 status = deflate(&Z, Z_FINISH);
 167                 deflateEnd(&Z);
 168
 169                 if (Z_STREAM_END == status) {
 170                         ulong crc;
 171                         char *trailer;
 172
 173                         crc = crc32(0L, Z_NULL, 0);
 174                         crc = crc32(crc, (const Bytef *) data, data_len);
 175
 176                         trailer = *encoded + sizeof(http_encoding_gzip_header) + Z.total_out;
 177
 178                         /* LSB */
 179                         trailer[0] = (char) (crc & 0xFF);
 180                         trailer[1] = (char) ((crc >> 8) & 0xFF);
 181                         trailer[2] = (char) ((crc >> 16) & 0xFF);
 182                         trailer[3] = (char) ((crc >> 24) & 0xFF);
 183                         trailer[4] = (char) ((Z.total_in) & 0xFF);
 184                         trailer[5] = (char) ((Z.total_in >> 8) & 0xFF);
 185                         trailer[6] = (char) ((Z.total_in >> 16) & 0xFF);
 186                         trailer[7] = (char) ((Z.total_in >> 24) & 0xFF);
 187
 188                         *encoded_len = Z.total_out + sizeof(http_encoding_gzip_header) + 8;
 189                         (*encoded)[*encoded_len] = '\0';
 190                         return SUCCESS;
 191                 }
 192         }
 193
 194         STR_SET(*encoded, NULL);
 195         http_error_ex(HE_WARNING, HTTP_E_ENCODING, "Could not gzencode data: %s", zError(status));
 196         return FAILURE;
 197 }
 198
 199 PHP_HTTP_API STATUS _http_encoding_gzdecode(const char *data, size_t data_len, char **decoded, size_t *decoded_len TSRMLS_DC)
 200 {
 201         const char *encoded;
 202         size_t encoded_len;
 203
 204         if (    (data && data_len) &&
 205                         (SUCCESS == http_encoding_gzencode_verify(data, data_len, &encoded, &encoded_len)) &&
 206                         (SUCCESS == http_encoding_inflate(encoded, encoded_len, decoded, decoded_len))) {
 207                 http_encoding_gzdecode_verify(data, data_len, *decoded, *decoded_len);
 208                 return SUCCESS;
 209         }
 210
 211         return FAILURE;
 212 }
 213
 214 PHP_HTTP_API STATUS _http_encoding_deflate(int level, int zhdr, const char *data, size_t data_len, char **encoded, size_t *encoded_len TSRMLS_DC)
 215 {
 216         z_stream Z;
 217         STATUS status = Z_OK;
 218
 219         *encoded = NULL;
 220         *encoded_len = 0;
 221         memset(&Z, 0, sizeof(z_stream));
 222
 223         Z.data_type = Z_UNKNOWN;
 224         Z.next_in   = (Bytef *) data;
 225         Z.avail_in  = data_len;
 226         Z.avail_out = HTTP_ENCODING_BUFLEN(data_len) - 1;
 227         Z.next_out  = emalloc(HTTP_ENCODING_BUFLEN(data_len));
 228
 229         *encoded = (char *) Z.next_out;
 230
 231         if (Z_OK == (status = deflateInit2(&Z, level, Z_DEFLATED, zhdr ? MAX_WBITS : -MAX_WBITS, MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY))) {
 232                 status = deflate(&Z, Z_FINISH);
 233                 deflateEnd(&Z);
 234
 235                 if (Z_STREAM_END == status) {
 236                         (*encoded)[*encoded_len = Z.total_out] = '\0';
 237                         return SUCCESS;
 238                 }
 239         }
 240
 241         STR_SET(*encoded, NULL);
 242         http_error_ex(HE_WARNING, HTTP_E_ENCODING, "Could not deflate data: %s", zError(status));
 243         return FAILURE;
 244 }
 245
 246 PHP_HTTP_API STATUS _http_encoding_inflate(const char *data, size_t data_len, char **decoded, size_t *decoded_len TSRMLS_DC)
 247 {
 248         int max = 0, wbits = -MAX_WBITS;
 249         STATUS status;
 250         z_stream Z;
 251
 252         *decoded = NULL;
 253         *decoded_len = 0;
 254         memset(&Z, 0, sizeof(z_stream));
 255
 256         do {
 257                 if (!max) {
 258                         *decoded_len = data_len * 2;
 259                         *decoded = emalloc(*decoded_len + 1);
 260                 } else {
 261                         size_t new_len = *decoded_len << 2;
 262                         char *new_ptr = erealloc_recoverable(*decoded, new_len + 1);
 263
 264                         if (new_ptr) {
 265                                 *decoded = new_ptr;
 266                                 *decoded_len = new_len;
 267                         } else {
 268                                 max = INT_MAX-1; /* avoid integer overflow on increment op */
 269                         }
 270                 }
 271
 272 retry_inflate:
 273                 Z.next_in   = (Bytef *) data;
 274                 Z.avail_in  = data_len;
 275                 Z.next_out  = (Bytef *) *decoded;
 276                 Z.avail_out = *decoded_len;
 277
 278                 if (Z_OK == (status = inflateInit2(&Z, wbits))) {
 279                         status = inflate(&Z, Z_FINISH);
 280                         inflateEnd(&Z);
 281
 282                         /* retry if it looks like we've got a zlib header */
 283                         if (wbits == -MAX_WBITS && status == Z_DATA_ERROR) {
 284                                 wbits = MAX_WBITS;
 285                                 goto retry_inflate;
 286                         }
 287
 288                         if (Z_STREAM_END == status) {
 289                                 (*decoded)[*decoded_len = Z.total_out] = '\0';
 290                                 return SUCCESS;
 291                         }
 292                 }
 293         } while (status == Z_BUF_ERROR && ++max < HTTP_ENCODING_MAXTRY);
 294
 295         STR_SET(*decoded, NULL);
 296         http_error_ex(HE_WARNING, HTTP_E_ENCODING, "Could not inflate data: %s", zError(status));
 297         return FAILURE;
 298 }
 299
 300 PHP_HTTP_API STATUS _http_encoding_gzencode_verify(const char *data, size_t data_len, const char **encoded, size_t *encoded_len, int error_level TSRMLS_DC)
 301 {
 302         size_t offset = sizeof(http_encoding_gzip_header);
 303
 304         if (data_len < offset) {
 305                 goto really_bad_gzip_header;
 306         }
 307
 308         if (data[0] != (const char) 0x1F || data[1] != (const char) 0x8B) {
 309                 http_error_ex(error_level TSRMLS_CC, HTTP_E_ENCODING, "Unrecognized GZIP header start: 0x%02X 0x%02X", (int) data[0], (int) (data[1] & 0xFF));
 310                 return FAILURE;
 311         }
 312
 313         if (data[2] != (const char) Z_DEFLATED) {
 314                 http_error_ex(error_level TSRMLS_CC, HTTP_E_ENCODING, "Unrecognized compression format (%d)", (int) (data[2] & 0xFF));
 315                 /* still try to decode */
 316         }
 317         if ((data[3] & 0x4) == 0x4) {
 318                 if (data_len < offset + 2) {
 319                         goto really_bad_gzip_header;
 320                 }
 321                 /* there are extra fields, the length follows the common header as 2 bytes LSB */
 322                 offset += (unsigned) ((data[offset] & 0xFF));
 323                 offset += 1;
 324                 offset += (unsigned) ((data[offset] & 0xFF) << 8);
 325                 offset += 1;
 326         }
 327         if ((data[3] & 0x8) == 0x8) {
 328                 if (data_len <= offset) {
 329                         goto really_bad_gzip_header;
 330                 }
 331                 /* there's a file name */
 332                 offset += strlen(&data[offset]) + 1 /*NUL*/;
 333         }
 334         if ((data[3] & 0x10) == 0x10) {
 335                 if (data_len <= offset) {
 336                         goto really_bad_gzip_header;
 337                 }
 338                 /* there's a comment */
 339                 offset += strlen(&data[offset]) + 1 /* NUL */;
 340         }
 341         if ((data[3] & 0x2) == 0x2) {
 342                 /* there's a CRC16 of the header */
 343                 offset += 2;
 344                 if (data_len <= offset) {
 345                         goto really_bad_gzip_header;
 346                 } else {
 347                         ulong crc, cmp;
 348
 349                         cmp =  (unsigned) ((data[offset-2] & 0xFF));
 350                         cmp += (unsigned) ((data[offset-1] & 0xFF) << 8);
 351
 352                         crc = crc32(0L, Z_NULL, 0);
 353                         crc = crc32(crc, (const Bytef *) data, sizeof(http_encoding_gzip_header));
 354
 355                         if (cmp != (crc & 0xFFFF)) {
 356                                 http_error_ex(error_level TSRMLS_CC, HTTP_E_ENCODING, "GZIP headers CRC checksums so not match (%lu, %lu)", cmp, crc & 0xFFFF);
 357                                 return FAILURE;
 358                         }
 359                 }
 360         }
 361
 362         if (data_len < offset + 8) {
 363                 http_error(error_level TSRMLS_CC, HTTP_E_ENCODING, "Missing or truncated GZIP footer");
 364                 return FAILURE;
 365         }
 366
 367         if (encoded) {
 368                 *encoded = data + offset;
 369         }
 370         if (encoded_len) {
 371                 *encoded_len = data_len - offset - 8 /* size of the assumed GZIP footer */;
 372         }
 373
 374         return SUCCESS;
 375
 376 really_bad_gzip_header:
 377         http_error(error_level TSRMLS_CC, HTTP_E_ENCODING, "Missing or truncated GZIP header");
 378         return FAILURE;
 379 }
 380
 381 PHP_HTTP_API STATUS _http_encoding_gzdecode_verify(const char *data, size_t data_len, const char *decoded, size_t decoded_len, int error_level TSRMLS_DC)
 382 {
 383         STATUS status = SUCCESS;
 384         ulong len, cmp, crc;
 385
 386         crc = crc32(0L, Z_NULL, 0);
 387         crc = crc32(crc, (const Bytef *) decoded, decoded_len);
 388
 389         cmp  = (unsigned) ((data[data_len-8] & 0xFF));
 390         cmp += (unsigned) ((data[data_len-7] & 0xFF) << 8);
 391         cmp += (unsigned) ((data[data_len-6] & 0xFF) << 16);
 392         cmp += (unsigned) ((data[data_len-5] & 0xFF) << 24);
 393         len  = (unsigned) ((data[data_len-4] & 0xFF));
 394         len += (unsigned) ((data[data_len-3] & 0xFF) << 8);
 395         len += (unsigned) ((data[data_len-2] & 0xFF) << 16);
 396         len += (unsigned) ((data[data_len-1] & 0xFF) << 24);
 397
 398         if (cmp != crc) {
 399                 http_error_ex(error_level TSRMLS_CC, HTTP_E_ENCODING, "Could not verify data integrity: CRC checksums do not match (%lu, %lu)", cmp, crc);
 400                 status = FAILURE;
 401         }
 402         if (len != decoded_len) {
 403                 http_error_ex(error_level TSRMLS_CC, HTTP_E_ENCODING, "Could not verify data integrity: data sizes do not match (%lu, %lu)", len, decoded_len);
 404                 status = FAILURE;
 405         }
 406         return status;
 407 }
 408
 409 #define HTTP_ENCODING_STREAM_ERROR(status, tofree) \
 410         { \
 411                 if (tofree) efree(tofree); \
 412                 http_error_ex(HE_WARNING, HTTP_E_ENCODING, "GZIP stream error: %s", zError(status)); \
 413                 return FAILURE; \
 414         }
 415
 416 PHP_HTTP_API STATUS _http_encoding_stream_init(http_encoding_stream *s, int flags, int level, char **encoded, size_t *encoded_len TSRMLS_DC)
 417 {
 418         STATUS status;
 419         int wbits = (flags & HTTP_ENCODING_STREAM_ZLIB_HEADER) ? MAX_WBITS : -MAX_WBITS;
 420
 421         memset(s, 0, sizeof(http_encoding_stream));
 422         if (Z_OK != (status = deflateInit2(&s->Z, level, Z_DEFLATED, wbits, MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY))) {
 423                 HTTP_ENCODING_STREAM_ERROR(status, NULL);
 424         }
 425
 426         s->persistent = (flags & HTTP_ENCODING_STREAM_PERSISTENT);
 427         if ((s->gzip = (flags & HTTP_ENCODING_STREAM_GZIP_HEADER))) {
 428                 s->crc = crc32(0L, Z_NULL, 0);
 429                 *encoded_len = sizeof(http_encoding_gzip_header);
 430                 *encoded = pemalloc(*encoded_len, s->persistent);
 431                 memcpy(*encoded, http_encoding_gzip_header, *encoded_len);
 432         } else {
 433                 *encoded_len = 0;
 434                 *encoded = NULL;
 435         }
 436
 437         return SUCCESS;
 438 }
 439
 440 PHP_HTTP_API STATUS _http_encoding_stream_update(http_encoding_stream *s, const char *data, size_t data_len, char **encoded, size_t *encoded_len TSRMLS_DC)
 441 {
 442         STATUS status;
 443
 444         *encoded_len = HTTP_ENCODING_BUFLEN(data_len);
 445         *encoded = pemalloc(*encoded_len, s->persistent);
 446
 447         s->Z.next_in = (Bytef *) data;
 448         s->Z.avail_in = data_len;
 449         s->Z.next_out = (Bytef *) *encoded;
 450         s->Z.avail_out = *encoded_len;
 451
 452         status = deflate(&s->Z, Z_SYNC_FLUSH);
 453
 454         if (Z_OK != status && Z_STREAM_END != status) {
 455                 HTTP_ENCODING_STREAM_ERROR(status, *encoded);
 456         }
 457         *encoded_len -= s->Z.avail_out;
 458
 459         if (s->gzip) {
 460                 s->crc = crc32(s->crc, (const Bytef *) data, data_len);
 461         }
 462
 463         return SUCCESS;
 464 }
 465
 466 PHP_HTTP_API STATUS _http_encoding_stream_finish(http_encoding_stream *s, char **encoded, size_t *encoded_len TSRMLS_DC)
 467 {
 468         STATUS status;
 469
 470         *encoded_len = 1024;
 471         *encoded = pemalloc(*encoded_len, s->persistent);
 472
 473         s->Z.next_out = (Bytef *) *encoded;
 474         s->Z.avail_out = *encoded_len;
 475
 476         if (Z_STREAM_END != (status = deflate(&s->Z, Z_FINISH)) || Z_OK != (status = deflateEnd(&s->Z))) {
 477                 HTTP_ENCODING_STREAM_ERROR(status, *encoded);
 478         }
 479
 480         *encoded_len -= s->Z.avail_out;
 481         if (s->gzip) {
 482                 if (s->Z.avail_out < 8) {
 483                         *encoded = perealloc(*encoded, *encoded_len + 8, s->persistent);
 484                 }
 485                 (*encoded)[(*encoded_len)++] = (char) (s->crc & 0xFF);
 486                 (*encoded)[(*encoded_len)++] = (char) ((s->crc >> 8) & 0xFF);
 487                 (*encoded)[(*encoded_len)++] = (char) ((s->crc >> 16) & 0xFF);
 488                 (*encoded)[(*encoded_len)++] = (char) ((s->crc >> 24) & 0xFF);
 489                 (*encoded)[(*encoded_len)++] = (char) ((s->Z.total_in) & 0xFF);
 490                 (*encoded)[(*encoded_len)++] = (char) ((s->Z.total_in >> 8) & 0xFF);
 491                 (*encoded)[(*encoded_len)++] = (char) ((s->Z.total_in >> 16) & 0xFF);
 492                 (*encoded)[(*encoded_len)++] = (char) ((s->Z.total_in >> 24) & 0xFF);
 493         }
 494
 495         return SUCCESS;
 496 }
 497
 498 #endif /* HTTP_HAVE_ZLIB */
 499
 500 PHP_HTTP_API zend_bool _http_encoding_response_start(size_t content_length TSRMLS_DC)
 501 {
 502         if (    php_ob_handler_used("ob_gzhandler" TSRMLS_CC) ||
 503                         php_ob_handler_used("zlib output compression" TSRMLS_CC)) {
 504                 HTTP_G(send).gzip_encoding = 0;
 505         } else {
 506                 if (!HTTP_G(send).gzip_encoding) {
 507                         /* emit a content-length header */
 508                         if (content_length) {
 509                                 char cl_header_str[128];
 510                                 size_t cl_header_len;
 511                                 cl_header_len = snprintf(cl_header_str, lenof(cl_header_str), "Content-Length: %zu", content_length);
 512                                 http_send_header_string_ex(cl_header_str, cl_header_len, 1);
 513                         }
 514                 } else {
 515 #ifndef HTTP_HAVE_ZLIB
 516                         HTTP_G(send).gzip_encoding = 0;
 517                         php_start_ob_buffer_named("ob_gzhandler", 0, 0 TSRMLS_CC);
 518 #else
 519                         HashTable *selected;
 520                         zval zsupported;
 521
 522                         INIT_PZVAL(&zsupported);
 523                         array_init(&zsupported);
 524                         add_next_index_stringl(&zsupported, "gzip", lenof("gzip"), 1);
 525                         add_next_index_stringl(&zsupported, "x-gzip", lenof("x-gzip"), 1);
 526                         add_next_index_stringl(&zsupported, "deflate", lenof("deflate"), 1);
 527
 528                         HTTP_G(send).gzip_encoding = 0;
 529
 530                         if ((selected = http_negotiate_encoding(&zsupported))) {
 531                                 STATUS hs = FAILURE;
 532                                 char *encoding = NULL;
 533                                 ulong idx;
 534
 535                                 if (HASH_KEY_IS_STRING == zend_hash_get_current_key(selected, &encoding, &idx, 0) && encoding) {
 536                                         if (!strcmp(encoding, "gzip") || !strcmp(encoding, "x-gzip")) {
 537                                                 if (SUCCESS == (hs = http_send_header_string("Content-Encoding: gzip"))) {
 538                                                         HTTP_G(send).gzip_encoding = HTTP_ENCODING_GZIP;
 539                                                 }
 540                                         } else if (!strcmp(encoding, "deflate")) {
 541                                                 if (SUCCESS == (hs = http_send_header_string("Content-Encoding: deflate"))) {
 542                                                         HTTP_G(send).gzip_encoding = HTTP_ENCODING_DEFLATE;
 543                                                 }
 544                                         }
 545                                         if (SUCCESS == hs) {
 546                                                 http_send_header_string("Vary: Accept-Encoding");
 547                                         }
 548                                 }
 549
 550                                 zend_hash_destroy(selected);
 551                                 FREE_HASHTABLE(selected);
 552                         }
 553
 554                         zval_dtor(&zsupported);
 555                         return HTTP_G(send).gzip_encoding;
 556 #endif
 557                 }
 558         }
 559         return 0;
 560 }
 561
 562 /*
 563  * Local variables:
 564  * tab-width: 4
 565  * c-basic-offset: 4
 566  * End:
 567  * vim600: noet sw=4 ts=4 fdm=marker
 568  * vim<600: noet sw=4 ts=4
 569  */
 570