zcontext = deflate_compress_new(DEFLATE_TYPE_ZLIB);
deflate_compress_data(zcontext, o->stream.text, o->stream.pos,
DEFLATE_END_OF_DATA, &zbuf, &zlen);
zcontext = deflate_compress_new(DEFLATE_TYPE_ZLIB);
deflate_compress_data(zcontext, o->stream.text, o->stream.pos,
DEFLATE_END_OF_DATA, &zbuf, &zlen);