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Diffstat (limited to 'src/core/transport/chttp2/stream_encoder.h')
| -rw-r--r-- | src/core/transport/chttp2/stream_encoder.h | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/src/core/transport/chttp2/stream_encoder.h b/src/core/transport/chttp2/stream_encoder.h new file mode 100644 index 0000000000..dad64697a5 --- /dev/null +++ b/src/core/transport/chttp2/stream_encoder.h @@ -0,0 +1,86 @@ +/* + * + * Copyright 2014, Google Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following disclaimer + * in the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Google Inc. nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#ifndef __GRPC_INTERNAL_TRANSPORT_CHTTP2_STREAM_ENCODER_H__ +#define __GRPC_INTERNAL_TRANSPORT_CHTTP2_STREAM_ENCODER_H__ + +#include "src/core/transport/chttp2/frame.h" +#include "src/core/transport/metadata.h" +#include "src/core/transport/stream_op.h" +#include <grpc/support/port_platform.h> +#include <grpc/support/slice.h> +#include <grpc/support/slice_buffer.h> + +#define GRPC_CHTTP2_HPACKC_NUM_FILTERS 256 +#define GRPC_CHTTP2_HPACKC_NUM_VALUES 256 +#define GRPC_CHTTP2_HPACKC_MAX_TABLE_ELEMS (4096 / 32) + +typedef struct { + gpr_uint32 filter_elems_sum; + /* one before the lowest usable table index */ + gpr_uint32 tail_remote_index; + gpr_uint16 table_size; + gpr_uint16 table_elems; + + /* filter tables for elems: this tables provides an approximate + popularity count for particular hashes, and are used to determine whether + a new literal should be added to the compression table or not. + They track a single integer that counts how often a particular value has + been seen. When that count reaches max (255), all values are halved. */ + gpr_uint8 filter_elems[GRPC_CHTTP2_HPACKC_NUM_FILTERS]; + + /* metadata context */ + grpc_mdctx *mdctx; + /* the string 'grpc-timeout' */ + grpc_mdstr *timeout_key_str; + + /* entry tables for keys & elems: these tables track values that have been + seen and *may* be in the decompressor table */ + grpc_mdstr *entries_keys[GRPC_CHTTP2_HPACKC_NUM_VALUES]; + grpc_mdelem *entries_elems[GRPC_CHTTP2_HPACKC_NUM_VALUES]; + gpr_uint32 indices_keys[GRPC_CHTTP2_HPACKC_NUM_VALUES]; + gpr_uint32 indices_elems[GRPC_CHTTP2_HPACKC_NUM_VALUES]; + + gpr_uint16 table_elem_size[GRPC_CHTTP2_HPACKC_MAX_TABLE_ELEMS]; +} grpc_chttp2_hpack_compressor; + +void grpc_chttp2_hpack_compressor_init(grpc_chttp2_hpack_compressor *c, + grpc_mdctx *mdctx); +void grpc_chttp2_hpack_compressor_destroy(grpc_chttp2_hpack_compressor *c); + +gpr_uint32 grpc_chttp2_encode_some(grpc_stream_op *ops, size_t *ops_count, + int eof, gpr_slice_buffer *output, + gpr_uint32 max_bytes, gpr_uint32 stream_id, + grpc_chttp2_hpack_compressor *compressor); + +#endif /* __GRPC_INTERNAL_TRANSPORT_CHTTP2_STREAM_ENCODER_H__ */ |