GRPC Core 0.10.0.0

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varint.h
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1 /*
2 *
3 * Copyright 2015, Google Inc.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met:
9 *
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * * Redistributions in binary form must reproduce the above
13 * copyright notice, this list of conditions and the following disclaimer
14 * in the documentation and/or other materials provided with the
15 * distribution.
16 * * Neither the name of Google Inc. nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 *
32 */
33
34 #ifndef GRPC_INTERNAL_CORE_TRANSPORT_CHTTP2_VARINT_H
35 #define GRPC_INTERNAL_CORE_TRANSPORT_CHTTP2_VARINT_H
36
37 #include <grpc/support/port_platform.h>
38
39 /* Helpers for hpack varint encoding */
40
41 /* length of a value that needs varint tail encoding (it's bigger than can be
42 bitpacked into the opcode byte) - returned value includes the length of the
43 opcode byte */
44 int grpc_chttp2_hpack_varint_length(gpr_uint32 tail_value);
45
46 void grpc_chttp2_hpack_write_varint_tail(gpr_uint32 tail_value,
47 gpr_uint8* target, int tail_length);
48
49 /* maximum value that can be bitpacked with the opcode if the opcode has a
50 prefix
51 of length prefix_bits */
52 #define GRPC_CHTTP2_MAX_IN_PREFIX(prefix_bits) ((1 << (8 - (prefix_bits))) - 1)
53
54 /* length required to bitpack a value */
55 #define GRPC_CHTTP2_VARINT_LENGTH(n, prefix_bits) \
56 ((n) < GRPC_CHTTP2_MAX_IN_PREFIX(prefix_bits) \
57 ? 1 \
58 : grpc_chttp2_hpack_varint_length( \
59 (n)-GRPC_CHTTP2_MAX_IN_PREFIX(prefix_bits)))
60
61 #define GRPC_CHTTP2_WRITE_VARINT(n, prefix_bits, prefix_or, target, length) \
62 do { \
63 gpr_uint8* tgt = target; \
64 if ((length) == 1) { \
65 (tgt)[0] = (prefix_or) | (n); \
66 } else { \
67 (tgt)[0] = (prefix_or) | GRPC_CHTTP2_MAX_IN_PREFIX(prefix_bits); \
68 grpc_chttp2_hpack_write_varint_tail( \
69 (n)-GRPC_CHTTP2_MAX_IN_PREFIX(prefix_bits), (tgt) + 1, (length)-1); \
70 } \
71 } while (0)
72
73 #endif /* GRPC_INTERNAL_CORE_TRANSPORT_CHTTP2_VARINT_H */
port_platform.h
gpr_uint8
uint8_t gpr_uint8
Definition: port_platform.h:307
grpc_chttp2_hpack_varint_length
int grpc_chttp2_hpack_varint_length(gpr_uint32 tail_value)
Definition: varint.c:36
gpr_uint32
uint32_t gpr_uint32
Definition: port_platform.h:309
grpc_chttp2_hpack_write_varint_tail
void grpc_chttp2_hpack_write_varint_tail(gpr_uint32 tail_value, gpr_uint8 *target, int tail_length)
Definition: varint.c:50