- gzip responses
[m6w6/ext-http] / http_encoding_api.c
index 69b6721bdc4df0fb76d9fce2a419052a49d19ef5..cba2d2547a595721790007a3d6cfc47610debff6 100644 (file)
 #include "php_http.h"
 #include "php_http_api.h"
 
+#ifdef HTTP_HAVE_ZLIB
+#      include "php_http_send_api.h"
+#      include "php_http_headers_api.h"
+#      include <zlib.h>
+#endif
+
 ZEND_EXTERN_MODULE_GLOBALS(http);
 
 /* {{{ char *http_encoding_dechunk(char *, size_t, char **, size_t *) */
@@ -93,21 +99,18 @@ PHP_HTTP_API const char *_http_encoding_dechunk(const char *encoded, size_t enco
 /* }}} */
 
 #ifdef HTTP_HAVE_ZLIB
-#include <zlib.h>
-
-/* max count of uncompress trials, alloc_size <<= 2 for each try */
-#define HTTP_GZMAXTRY 10
-/* safe padding */
-#define HTTP_GZSAFPAD 10
-/* add 1% extra space in case we need to encode widely differing (binary) data */
-#define HTTP_GZBUFLEN(l) (l + (l / 100) + HTTP_GZSAFPAD)
-
-static const char http_gzencode_header[] = {
-       (const char) 0x1f, 
-       (const char) 0x8b, 
-       (const char) Z_DEFLATED, 
-       0, 0, 0, 0, 0, 0, 
-       (const char) 0x03
+
+static const char http_encoding_gzip_header[] = {
+       (const char) 0x1f,                      // fixed value
+       (const char) 0x8b,                      // fixed value
+       (const char) Z_DEFLATED,        // compression algorithm
+       (const char) 0,                         // none of the possible flags defined by the GZIP "RFC"
+       (const char) 0,                         // no MTIME available (4 bytes)
+       (const char) 0,                         // =*=
+       (const char) 0,                         // =*=
+       (const char) 0,                         // =*=
+       (const char) 0,                         // two possible flag values for 9 compression levels? o_O
+       (const char) 0x03                       // assume *nix OS
 };
 
 inline void http_init_gzencode_buffer(z_stream *Z, const char *data, size_t data_len, char **buf_ptr)
@@ -118,12 +121,12 @@ inline void http_init_gzencode_buffer(z_stream *Z, const char *data, size_t data
        
        Z->next_in   = (Bytef *) data;
        Z->avail_in  = data_len;
-       Z->avail_out = HTTP_GZBUFLEN(data_len) + HTTP_GZSAFPAD - 1;
+       Z->avail_out = HTTP_ENCODING_BUFLEN(data_len) + HTTP_ENCODING_SAFPAD - 1;
        
-       *buf_ptr = emalloc(HTTP_GZBUFLEN(data_len) + sizeof(http_gzencode_header) + HTTP_GZSAFPAD);
-       memcpy(*buf_ptr, http_gzencode_header, sizeof(http_gzencode_header));
+       *buf_ptr = emalloc(HTTP_ENCODING_BUFLEN(data_len) + sizeof(http_encoding_gzip_header) + HTTP_ENCODING_SAFPAD);
+       memcpy(*buf_ptr, http_encoding_gzip_header, sizeof(http_encoding_gzip_header));
        
-       Z->next_out = *buf_ptr + sizeof(http_gzencode_header);
+       Z->next_out = *buf_ptr + sizeof(http_encoding_gzip_header);
 }
 
 inline void http_init_deflate_buffer(z_stream *Z, const char *data, size_t data_len, char **buf_ptr)
@@ -135,24 +138,36 @@ inline void http_init_deflate_buffer(z_stream *Z, const char *data, size_t data_
        Z->data_type = Z_UNKNOWN;
        Z->next_in   = (Bytef *) data;
        Z->avail_in  = data_len;
-       Z->avail_out = HTTP_GZBUFLEN(data_len) - 1;
-       Z->next_out  = emalloc(HTTP_GZBUFLEN(data_len));
+       Z->avail_out = HTTP_ENCODING_BUFLEN(data_len) - 1;
+       Z->next_out  = emalloc(HTTP_ENCODING_BUFLEN(data_len));
        
        *buf_ptr = Z->next_out;
 }
 
-inline void http_init_inflate_buffer(z_stream *Z, const char *data, size_t data_len, char **buf_ptr, size_t *buf_len, int iteration)
+inline void http_init_uncompress_buffer(size_t data_len, char **buf_ptr, size_t *buf_len, int *iteration)
 {
-       Z->zalloc = Z_NULL;
-       Z->zfree  = Z_NULL;
-       
-       if (!iteration) {
+       if (!*iteration) {
                *buf_len = data_len * 2;
                *buf_ptr = emalloc(*buf_len + 1);
        } else {
-               *buf_len <<= 2;
-               *buf_ptr = erealloc(*buf_ptr, *buf_len + 1);
+               size_t new_len = *buf_len << 2;
+               char *new_ptr = erealloc(*buf_ptr, new_len + 1);
+               
+               if (new_ptr) {
+                       *buf_ptr = new_ptr;
+                       *buf_len = new_len;
+               } else {
+                       *iteration = INT_MAX;
+               }
        }
+}
+
+inline void http_init_inflate_buffer(z_stream *Z, const char *data, size_t data_len, char **buf_ptr, size_t *buf_len, int *iteration)
+{
+       Z->zalloc = Z_NULL;
+       Z->zfree  = Z_NULL;
+       
+       http_init_uncompress_buffer(data_len, buf_ptr, buf_len, iteration);
        
        Z->next_in   = (Bytef *) data;
        Z->avail_in  = data_len;
@@ -174,7 +189,7 @@ inline size_t http_finish_gzencode_buffer(z_stream *Z, const char *data, size_t
        crc = crc32(0L, Z_NULL, 0);
        crc = crc32(crc, (const Bytef *) data, data_len);
        
-       trailer = *buf_ptr + sizeof(http_gzencode_header) + Z->total_out;
+       trailer = *buf_ptr + sizeof(http_encoding_gzip_header) + Z->total_out;
        
        /* LSB */
        trailer[0] = (char) (crc & 0xFF);
@@ -186,9 +201,182 @@ inline size_t http_finish_gzencode_buffer(z_stream *Z, const char *data, size_t
        trailer[6] = (char) ((Z->total_in >> 16) & 0xFF);
        trailer[7] = (char) ((Z->total_in >> 24) & 0xFF);
        
-       return http_finish_buffer(Z->total_out + sizeof(http_gzencode_header) + 8, buf_ptr);
+       return http_finish_buffer(Z->total_out + sizeof(http_encoding_gzip_header) + 8, buf_ptr);
+}
+
+inline STATUS http_verify_gzencode_buffer(const char *data, size_t data_len, const char **encoded, size_t *encoded_len, int error_level TSRMLS_DC)
+{
+       size_t offset = sizeof(http_encoding_gzip_header);
+       
+       if (data_len < offset) {
+               goto really_bad_gzip_header;
+       }
+       
+       if (data[0] != (const char) 0x1F || data[1] != (const char) 0x8B) {
+               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));
+               return FAILURE;
+       }
+       
+       if (data[2] != (const char) Z_DEFLATED) {
+               http_error_ex(error_level TSRMLS_CC, HTTP_E_ENCODING, "Unrecognized compression format (%d)", (int) (data[2] & 0xFF));
+               /* still try to decode */
+       }
+       if ((data[3] & 0x4) == 0x4) {
+               if (data_len < offset + 2) {
+                       goto really_bad_gzip_header;
+               }
+               /* there are extra fields, the length follows the common header as 2 bytes LSB */
+               offset += (unsigned) ((data[offset] & 0xFF));
+               offset += 1;
+               offset += (unsigned) ((data[offset] & 0xFF) << 8);
+               offset += 1;
+       }
+       if ((data[3] & 0x8) == 0x8) {
+               if (data_len <= offset) {
+                       goto really_bad_gzip_header;
+               }
+               /* there's a file name */
+               offset += strlen(&data[offset]) + 1 /*NUL*/;
+       }
+       if ((data[3] & 0x10) == 0x10) {
+               if (data_len <= offset) {
+                       goto really_bad_gzip_header;
+               }
+               /* there's a comment */
+               offset += strlen(&data[offset]) + 1 /* NUL */;
+       }
+       if ((data[3] & 0x2) == 0x2) {
+               /* there's a CRC16 of the header */
+               offset += 2;
+               if (data_len <= offset) {
+                       goto really_bad_gzip_header;
+               } else {
+                       unsigned long crc, cmp;
+                       
+                       cmp =  (unsigned) ((data[offset-2] & 0xFF));
+                       cmp += (unsigned) ((data[offset-1] & 0xFF) << 8);
+                       
+                       crc = crc32(0L, Z_NULL, 0);
+                       crc = crc32(crc, data, sizeof(http_encoding_gzip_header));
+                       
+                       if (cmp != (crc & 0xFFFF)) {
+                               http_error_ex(error_level TSRMLS_CC, HTTP_E_ENCODING, "GZIP headers CRC checksums so not match (%lu, %lu)", cmp, crc & 0xFFFF);
+                               return FAILURE;
+                       }
+               }
+       }
+       
+       if (data_len < offset + 8) {
+               http_error(error_level TSRMLS_CC, HTTP_E_ENCODING, "Missing or truncated GZIP footer");
+               return FAILURE;
+       }
+       
+       if (encoded) {
+               *encoded = data + offset;
+       }
+       if (encoded_len) {
+               *encoded_len = data_len - offset - 8 /* size of the assumed GZIP footer */;     
+       }
+       
+       return SUCCESS;
+       
+really_bad_gzip_header:
+       http_error(error_level TSRMLS_CC, HTTP_E_ENCODING, "Missing or truncated GZIP header");
+       return FAILURE;
 }
 
+inline STATUS http_verify_gzdecode_buffer(const char *data, size_t data_len, const char *decoded, size_t decoded_len, int error_level TSRMLS_DC)
+{
+       STATUS status = SUCCESS;
+       unsigned long len, cmp, crc;
+       
+       crc = crc32(0L, Z_NULL, 0);
+       crc = crc32(crc, (const Bytef *) decoded, decoded_len);
+       
+       cmp  = (unsigned) ((data[data_len-8] & 0xFF));
+       cmp += (unsigned) ((data[data_len-7] & 0xFF) << 8);
+       cmp += (unsigned) ((data[data_len-6] & 0xFF) << 16);
+       cmp += (unsigned) ((data[data_len-5] & 0xFF) << 24);
+       len  = (unsigned) ((data[data_len-4] & 0xFF));
+       len += (unsigned) ((data[data_len-3] & 0xFF) << 8);
+       len += (unsigned) ((data[data_len-2] & 0xFF) << 16);
+       len += (unsigned) ((data[data_len-1] & 0xFF) << 24);
+       
+       if (cmp != crc) {
+               http_error_ex(error_level TSRMLS_CC, HTTP_E_ENCODING, "Could not verify data integrity: CRC checksums do not match (%lu, %lu)", cmp, crc);
+               status = FAILURE;
+       }
+       if (len != decoded_len) {
+               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);
+               status = FAILURE;
+       }
+       return status;
+}
+
+PHP_HTTP_API STATUS _http_encode(http_encoding_type type, int level, const char *data, size_t data_len, char **encoded, size_t *encoded_len TSRMLS_DC)
+{
+       STATUS status = SUCCESS;
+       
+       switch (type)
+       {
+               case HTTP_ENCODING_ANY:
+               case HTTP_ENCODING_GZIP:
+                       status = http_encoding_gzencode(level, data, data_len, encoded, encoded_len);
+               break;
+               
+               case HTTP_ENCODING_DEFLATE:
+                       status = http_encoding_deflate(level, data, data_len, encoded, encoded_len);
+               break;
+               
+               case HTTP_ENCODING_COMPRESS:
+                       status = http_encoding_compress(level, data, data_len, encoded, encoded_len);
+               break;
+               
+               case HTTP_ENCODING_NONE:
+               default:
+                       *encoded = estrndup(data, data_len);
+                       *encoded_len = data_len;
+               break;
+       }
+       
+       return status;
+}
+
+PHP_HTTP_API STATUS _http_decode(http_encoding_type type, const char *data, size_t data_len, char **decoded, size_t *decoded_len TSRMLS_DC)
+{
+       STATUS status = SUCCESS;
+       
+       switch (type)
+       {
+               case HTTP_ENCODING_ANY:
+                       if (    SUCCESS != http_encoding_gzdecode(data, data_len, decoded, decoded_len) &&
+                                       SUCCESS != http_encoding_inflate(data, data_len, decoded, decoded_len) &&
+                                       SUCCESS != http_encoding_uncompress(data, data_len, decoded, decoded_len)) {
+                               status = FAILURE;
+                       }
+               break;
+               
+               case HTTP_ENCODING_GZIP:
+                       status = http_encoding_gzdecode(data, data_len, decoded, decoded_len);
+               break;
+               
+               case HTTP_ENCODING_DEFLATE:
+                       status = http_encoding_inflate(data, data_len, decoded, decoded_len);
+               break;
+               
+               case HTTP_ENCODING_COMPRESS:
+                       status = http_encoding_uncompress(data, data_len, decoded, decoded_len);
+               break;
+               
+               case HTTP_ENCODING_NONE:
+               default:
+                       *decoded = estrndup(data, data_len);
+                       *decoded_len = data_len;
+               break;
+       }
+       
+       return status;
+}
 
 PHP_HTTP_API STATUS _http_encoding_gzencode(int level, const char *data, size_t data_len, char **encoded, size_t *encoded_len TSRMLS_DC)
 {
@@ -232,7 +420,7 @@ PHP_HTTP_API STATUS _http_encoding_compress(int level, const char *data, size_t
 {
        STATUS status;
        
-       *encoded = emalloc(*encoded_len = HTTP_GZBUFLEN(data_len));
+       *encoded = emalloc(*encoded_len = HTTP_ENCODING_BUFLEN(data_len));
        
        if (Z_OK == (status = compress2(*encoded, encoded_len, data, data_len, level))) {
                http_finish_buffer(*encoded_len, encoded);
@@ -246,38 +434,15 @@ PHP_HTTP_API STATUS _http_encoding_compress(int level, const char *data, size_t
 
 PHP_HTTP_API STATUS _http_encoding_gzdecode(const char *data, size_t data_len, char **decoded, size_t *decoded_len TSRMLS_DC)
 {
-       const char *encoded = data + sizeof(http_gzencode_header);
+       const char *encoded;
        size_t encoded_len;
        
-       if (data_len <= sizeof(http_gzencode_header) + 8) {
-               http_error(HE_WARNING, HTTP_E_ENCODING, "Could not gzdecode data: too short data length");
-       } else {
-               encoded_len = data_len - sizeof(http_gzencode_header) - 8;
-               
-               if (SUCCESS == http_encoding_inflate(encoded, encoded_len, decoded, decoded_len)) {
-                       unsigned long len = 0, cmp = 0, crc = crc32(0L, Z_NULL, 0);
-                       
-                       crc = crc32(crc, (const Bytef *) *decoded, *decoded_len);
-                       
-                       cmp  = (unsigned) ((data[data_len-8] & 0xFF));
-                       cmp += (unsigned) ((data[data_len-7] & 0xFF) << 8);
-                       cmp += (unsigned) ((data[data_len-6] & 0xFF) << 16);
-                       cmp += (unsigned) ((data[data_len-5] & 0xFF) << 24);
-                       len  = (unsigned) ((data[data_len-4] & 0xFF));
-                       len += (unsigned) ((data[data_len-3] & 0xFF) << 8);
-                       len += (unsigned) ((data[data_len-2] & 0xFF) << 16);
-                       len += (unsigned) ((data[data_len-1] & 0xFF) << 24);
-                       
-                       if (cmp != crc) {
-                               http_error_ex(HE_NOTICE, HTTP_E_ENCODING, "Could not verify data integrity: CRC checksums do not match (%lu, %lu)", cmp, crc);
-                       }
-                       if (len != *decoded_len) {
-                               http_error_ex(HE_NOTICE, HTTP_E_ENCODING, "Could not verify data integrity: data sizes do not match (%lu, %lu)", len, *decoded_len);
-                       }
-                       
-                       return SUCCESS;
-               }
+       if (    (SUCCESS == http_verify_gzencode_buffer(data, data_len, &encoded, &encoded_len, HE_NOTICE)) &&
+                       (SUCCESS == http_encoding_inflate(encoded, encoded_len, decoded, decoded_len))) {
+               http_verify_gzdecode_buffer(data, data_len, *decoded, *decoded_len, HE_NOTICE);
+               return SUCCESS;
        }
+       
        return FAILURE;
 }
 
@@ -288,7 +453,7 @@ PHP_HTTP_API STATUS _http_encoding_inflate(const char *data, size_t data_len, ch
        z_stream Z;
        
        do {
-               http_init_inflate_buffer(&Z, data, data_len, decoded, decoded_len, max++);
+               http_init_inflate_buffer(&Z, data, data_len, decoded, decoded_len, &max);
                if (Z_OK == (status = inflateInit2(&Z, -MAX_WBITS))) {
                        if (Z_STREAM_END == (status = inflate(&Z, Z_FINISH))) {
                                if (Z_OK == (status = inflateEnd(&Z))) {
@@ -297,8 +462,9 @@ PHP_HTTP_API STATUS _http_encoding_inflate(const char *data, size_t data_len, ch
                                }
                        }
                }
-       } while (max < HTTP_GZMAXTRY);
+       } while (++max < HTTP_ENCODING_MAXTRY && status == Z_BUF_ERROR);
        
+       efree(*decoded);
        http_error_ex(HE_WARNING, HTTP_E_ENCODING, "Could not inflate data: %s", zError(status));
        return FAILURE;
 }
@@ -307,29 +473,170 @@ PHP_HTTP_API STATUS _http_encoding_uncompress(const char *data, size_t data_len,
 {
        int max = 0;
        STATUS status;
-       size_t want = data_len * 2;
-       
-       *decoded = emalloc(want + 1);
-       if (Z_BUF_ERROR == (status = uncompress(*decoded, &want, data, data_len))) do {
-               /*      this is a lot faster with large data than gzuncompress(),
-                       but could be a problem with a low memory limit */
-               want <<= 2;
-               *decoded = erealloc(*decoded, want + 1);
-               status = uncompress(*decoded, &want, data, data_len);
-       } while (++max < HTTP_GZMAXTRY && status == Z_BUF_ERROR);
-       
-       if (Z_OK == status) {
-               *decoded_len = http_finish_buffer(want, decoded);
-               return SUCCESS;
-       }
+       
+       do {
+               http_init_uncompress_buffer(data_len, decoded, decoded_len, &max);
+               if (Z_OK == (status = uncompress(*decoded, decoded_len, data, data_len))) {
+                       http_finish_buffer(*decoded_len, decoded);
+                       return SUCCESS;
+               }
+       } while (++max < HTTP_ENCODING_MAXTRY && status == Z_BUF_ERROR);
        
        efree(*decoded);
        http_error_ex(HE_WARNING, HTTP_E_ENCODING, "Could not uncompress data: %s", zError(status));
        return FAILURE;
 }
 
+#define HTTP_ENCODING_STREAM_ERROR(status, tofree) \
+       { \
+               if (tofree) efree(tofree); \
+               http_error_ex(HE_WARNING, HTTP_E_ENCODING, "GZIP stream error: %s", zError(status)); \
+               return FAILURE; \
+       }
+
+PHP_HTTP_API STATUS _http_encoding_stream_init(http_encoding_stream *s, int gzip, int level, char **encoded, size_t *encoded_len TSRMLS_DC)
+{
+       STATUS status;
+       
+       memset(s, 0, sizeof(http_encoding_stream));
+       if (Z_OK != (status = deflateInit2(&s->Z, level, Z_DEFLATED, -MAX_WBITS, MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY))) {
+               HTTP_ENCODING_STREAM_ERROR(status, NULL);
+       }
+       
+       if (s->gzip = gzip) {
+               s->crc = crc32(0L, Z_NULL, 0);
+               *encoded_len = sizeof(http_encoding_gzip_header);
+               *encoded = emalloc(*encoded_len);
+               memcpy(*encoded, http_encoding_gzip_header, *encoded_len);
+       } else {
+               *encoded_len = 0;
+               *encoded = NULL;
+       }
+       
+       return SUCCESS;
+}
+
+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)
+{
+       STATUS status;
+       
+       *encoded_len = HTTP_ENCODING_BUFLEN(data_len);
+       *encoded = emalloc(*encoded_len);
+       
+       s->Z.next_in = (Bytef *) data;
+       s->Z.avail_in = data_len;
+       s->Z.next_out = *encoded;
+       s->Z.avail_out = *encoded_len;
+       
+       status = deflate(&s->Z, Z_SYNC_FLUSH);
+       
+       if (Z_OK != status && Z_STREAM_END != status) {
+               HTTP_GZSTREAM_ERROR(status, *encoded);
+       }
+       *encoded_len -= s->Z.avail_out;
+       
+       if (s->gzip) {
+               s->crc = crc32(s->crc, (const Bytef *) data, data_len);
+       }
+       
+       return SUCCESS;
+}
+
+PHP_HTTP_API STATUS _http_encoding_stream_finish(http_encoding_stream *s, char **encoded, size_t *encoded_len TSRMLS_DC)
+{
+       STATUS status;
+       
+       *encoded_len = 1024;
+       *encoded = emalloc(*encoded_len);
+       
+       s->Z.next_out = *encoded;
+       s->Z.avail_out = *encoded_len;
+       
+       if (Z_STREAM_END != (status = deflate(&s->Z, Z_FINISH)) || Z_OK != (status = deflateEnd(&s->Z))) {
+               HTTP_ENCODING_STREAM_ERROR(status, *encoded);
+       }
+       
+       fprintf(stderr, "Needed %d bytes\n", *encoded_len - s->Z.avail_out);
+       
+       *encoded_len -= s->Z.avail_out;
+       if (s->gzip) {
+               if (s->Z.avail_out < 8) {
+                       *encoded = erealloc(*encoded, *encoded_len + 8);
+               }
+               (*encoded)[(*encoded_len)++] = (char) (s->crc & 0xFF);
+               (*encoded)[(*encoded_len)++] = (char) ((s->crc >> 8) & 0xFF);
+               (*encoded)[(*encoded_len)++] = (char) ((s->crc >> 16) & 0xFF);
+               (*encoded)[(*encoded_len)++] = (char) ((s->crc >> 24) & 0xFF);
+               (*encoded)[(*encoded_len)++] = (char) ((s->Z.total_in) & 0xFF);
+               (*encoded)[(*encoded_len)++] = (char) ((s->Z.total_in >> 8) & 0xFF);
+               (*encoded)[(*encoded_len)++] = (char) ((s->Z.total_in >> 16) & 0xFF);
+               (*encoded)[(*encoded_len)++] = (char) ((s->Z.total_in >> 24) & 0xFF);
+       }
+       
+       return SUCCESS;
+}
+
 #endif /* HTTP_HAVE_ZLIB */
 
+PHP_HTTP_API zend_bool _http_encoding_response_start(size_t content_length TSRMLS_DC)
+{
+       if (php_ob_handler_used("ob_gzhandler" TSRMLS_DC)||php_ob_handler_used("zlib output compression" TSRMLS_DC)) {
+               HTTP_G(send).gzip_encoding = 0;
+       } else {
+               if (!HTTP_G(send).gzip_encoding) {
+                       /* emit a content-length header */
+                       if (content_length) {
+                               char *cl;
+                               spprintf(&cl, 0, "Content-Length: %lu", (unsigned long) content_length);
+                               http_send_header_string(cl);
+                               efree(cl);
+                       }
+               } else {
+#ifndef HTTP_HAVE_ZLIB
+                       php_start_ob_buffer_named("ob_gzhandler", 0, 0 TSRMLS_CC);
+#else
+                       HashTable *selected;
+                       zval zsupported;
+                       
+                       INIT_PZVAL(&zsupported);
+                       array_init(&zsupported);
+                       add_next_index_stringl(&zsupported, "gzip", lenof("gzip"), 1);
+                       add_next_index_stringl(&zsupported, "deflate", lenof("deflate"), 1);
+                       
+                       if (selected = http_negotiate_encoding(&zsupported)) {
+                               STATUS hs = FAILURE;
+                               char *encoding = NULL;
+                               ulong idx;
+                               
+                               if (HASH_KEY_IS_STRING == zend_hash_get_current_key(selected, &encoding, &idx, 0) && encoding) {
+                                       if (!strcmp(encoding, "gzip")) {
+                                               if (SUCCESS == (hs = http_send_header_string("Content-Encoding: gzip"))) {
+                                                       HTTP_G(send).gzip_encoding = HTTP_ENCODING_GZIP;
+                                               }
+                                       } else if (!strcmp(encoding, "deflate")) {
+                                               if (SUCCESS == (hs = http_send_header_string("Content-Encoding: deflate"))) {
+                                                       HTTP_G(send).gzip_encoding = HTTP_ENCODING_DEFLATE;
+                                               }
+                                       }
+                                       if (SUCCESS == hs) {
+                                               http_send_header_string("Vary: Accept-Encoding");
+                                       } else {
+                                               HTTP_G(send).gzip_encoding = 0;
+                                       }
+                               }
+                               
+                               zend_hash_destroy(selected);
+                               FREE_HASHTABLE(selected);
+                       }
+                       
+                       zval_dtor(&zsupported);
+                       return 1;
+#endif
+               }
+       }
+       return 0;
+}
+
 /*
  * Local variables:
  * tab-width: 4