+/* max count of uncompress trials, alloc_size <<= 2 for each try */
+#define HTTP_ENCODING_MAXTRY 10
+/* safe padding */
+#define HTTP_ENCODING_SAFPAD 10
+/* add 1% extra space in case we need to encode widely differing (binary) data */
+#define HTTP_ENCODING_BUFLEN(l) (l + (l / 100) + HTTP_ENCODING_SAFPAD)
+
+typedef enum {
+ HTTP_ENCODING_NONE = 0,
+ HTTP_ENCODING_GZIP,
+ HTTP_ENCODING_DEFLATE,
+} http_encoding_type;
+
+#define HTTP_ENCODING_STREAM_GZIP_HEADER 0x1
+#define HTTP_ENCODING_STREAM_ZLIB_HEADER 0x2
+#define HTTP_ENCODING_STREAM_PERSISTENT 0x4
+
+typedef struct {
+ z_stream Z;
+ int gzip;
+ int persistent;
+ ulong crc;
+ void *storage;
+} http_encoding_stream;
+
+#define http_encoding_stream_init(s, g, l, e, el) _http_encoding_stream_init((s), (g), (l), (e), (el) TSRMLS_CC)
+PHP_HTTP_API STATUS _http_encoding_stream_init(http_encoding_stream *s, int flags, int level, char **encoded, size_t *encoded_len TSRMLS_DC);
+#define http_encoding_stream_update(s, d, dl, e, el) _http_encoding_stream_update((s), (d), (dl), (e), (el) TSRMLS_CC)
+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);
+#define http_encoding_stream_finish(s, e, el) _http_encoding_stream_finish((s), (e), (el) TSRMLS_CC)
+PHP_HTTP_API STATUS _http_encoding_stream_finish(http_encoding_stream *s, char **encoded, size_t *encoded_len TSRMLS_DC);
+
+#define http_encoding_gzencode_verify(d, dl, e, el) _http_encoding_gzencode_verify((d), (dl), (e), (el), HE_NOTICE)
+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);
+#define http_encoding_gzdecode_verify(e, el, d, dl) _http_encoding_gzdecode_verify((e), (el), (d), (dl), HE_NOTICE)
+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);
+
+#define http_encoding_gzencode(l, m, d, dl, r, rl) _http_encoding_gzencode((l), (m), (d), (dl), (r), (rl) TSRMLS_CC)
+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);