+#define HTTP_DEFLATE_WBITS_SET(flags, wbits) \
+ switch (flags & 0xf0) \
+ { \
+ case HTTP_DEFLATE_TYPE_GZIP: \
+ wbits = HTTP_WINDOW_BITS_GZIP; \
+ break; \
+ case HTTP_DEFLATE_TYPE_RAW: \
+ wbits = HTTP_WINDOW_BITS_RAW; \
+ break; \
+ default: \
+ wbits = HTTP_WINDOW_BITS_ZLIB; \
+ break; \
+ }
+
+#define HTTP_INFLATE_WBITS_SET(flags, wbits) \
+ if (flags & HTTP_INFLATE_TYPE_RAW) { \
+ wbits = HTTP_WINDOW_BITS_RAW; \
+ } else { \
+ wbits = HTTP_WINDOW_BITS_ANY; \
+ }
+
+#define HTTP_DEFLATE_STRATEGY_SET(flags, strategy) \
+ switch (flags & 0xf00) \
+ { \
+ case HTTP_DEFLATE_STRATEGY_FILT: \
+ strategy = Z_FILTERED; \
+ break; \
+ case HTTP_DEFLATE_STRATEGY_HUFF: \
+ strategy = Z_HUFFMAN_ONLY; \
+ break; \
+ case HTTP_DEFLATE_STRATEGY_RLE: \
+ strategy = Z_RLE; \
+ break; \
+ case HTTP_DEFLATE_STRATEGY_FIXED: \
+ strategy = Z_FIXED; \
+ break; \
+ default: \
+ strategy = Z_DEFAULT_STRATEGY; \
+ break; \
+ }
+
+#define HTTP_WINDOW_BITS_ZLIB 0x0000000f
+#define HTTP_WINDOW_BITS_GZIP 0x0000001f
+#define HTTP_WINDOW_BITS_ANY 0x0000002f
+#define HTTP_WINDOW_BITS_RAW -0x000000f
+
+PHP_HTTP_API STATUS _http_encoding_deflate(int flags, const char *data, size_t data_len, char **encoded, size_t *encoded_len ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC TSRMLS_DC)
+{
+ int status, level, wbits, strategy;
+ z_stream Z;
+
+ HTTP_DEFLATE_LEVEL_SET(flags, level);
+ HTTP_DEFLATE_WBITS_SET(flags, wbits);
+ HTTP_DEFLATE_STRATEGY_SET(flags, strategy);
+
+ memset(&Z, 0, sizeof(z_stream));
+ *encoded = NULL;
+ *encoded_len = 0;
+
+ status = deflateInit2(&Z, level, Z_DEFLATED, wbits, MAX_MEM_LEVEL, strategy);
+ if (Z_OK == status) {
+ *encoded_len = HTTP_ENCODING_BUFLEN(data_len);
+ *encoded = emalloc_rel(*encoded_len);
+
+ Z.next_in = (Bytef *) data;
+ Z.next_out = (Bytef *) *encoded;
+ Z.avail_in = data_len;
+ Z.avail_out = *encoded_len;
+
+ status = deflate(&Z, Z_FINISH);
+ deflateEnd(&Z);
+
+ if (Z_STREAM_END == status) {
+ /* size buffer down to actual length */
+ *encoded = erealloc_rel(*encoded, Z.total_out + 1);
+ (*encoded)[*encoded_len = Z.total_out] = '\0';
+ return SUCCESS;
+ } else {
+ STR_SET(*encoded, NULL);
+ *encoded_len = 0;
+ }
+ }