/root/doris/be/src/util/coding.cpp
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1 | | // Copyright (c) 2011-present, Facebook, Inc. All rights reserved. |
2 | | // This source code is licensed under both the GPLv2 (found in the |
3 | | // COPYING file in the root directory) and Apache 2.0 License |
4 | | // (found in the LICENSE.Apache file in the root directory). |
5 | | // Copyright (c) 2011 The LevelDB Authors. All rights reserved. |
6 | | // Use of this source code is governed by a BSD-style license that can be |
7 | | // found in the LICENSE file. See the AUTHORS file for names of contributors. |
8 | | |
9 | | #include "util/coding.h" |
10 | | |
11 | | namespace doris { |
12 | | #include "common/compile_check_begin.h" |
13 | | |
14 | 35.0M | uint8_t* encode_varint32(uint8_t* dst, uint32_t v) { |
15 | | // Operate on characters as unsigneds |
16 | 35.0M | static const int B = 128; |
17 | 35.0M | if (v < (1 << 7)) { |
18 | 33.6M | *(dst++) = uint8_t(v); |
19 | 33.6M | } else if (v < (1 << 14)) { |
20 | 1.37M | *(dst++) = uint8_t(v | B); |
21 | 1.37M | *(dst++) = uint8_t(v >> 7); |
22 | 1.37M | } else if (v < (1 << 21)) { |
23 | 43.2k | *(dst++) = uint8_t(v | B); |
24 | 43.2k | *(dst++) = uint8_t((v >> 7) | B); |
25 | 43.2k | *(dst++) = uint8_t(v >> 14); |
26 | 18.4E | } else if (v < (1 << 28)) { |
27 | 2 | *(dst++) = uint8_t(v | B); |
28 | 2 | *(dst++) = uint8_t((v >> 7) | B); |
29 | 2 | *(dst++) = uint8_t((v >> 14) | B); |
30 | 2 | *(dst++) = uint8_t(v >> 21); |
31 | 18.4E | } else { |
32 | 18.4E | *(dst++) = uint8_t(v | B); |
33 | 18.4E | *(dst++) = uint8_t((v >> 7) | B); |
34 | 18.4E | *(dst++) = uint8_t((v >> 14) | B); |
35 | 18.4E | *(dst++) = uint8_t((v >> 21) | B); |
36 | 18.4E | *(dst++) = uint8_t(v >> 28); |
37 | 18.4E | } |
38 | 35.0M | return dst; |
39 | 35.0M | } |
40 | | |
41 | | const uint8_t* decode_varint32_ptr_fallback(const uint8_t* p, const uint8_t* limit, |
42 | 5.87M | uint32_t* value) { |
43 | 5.87M | uint32_t result = 0; |
44 | 12.0M | for (uint32_t shift = 0; shift <= 28 && p < limit; shift += 7) { |
45 | 12.0M | uint32_t byte = *p; |
46 | 12.0M | p++; |
47 | 12.0M | if (byte & 128) { |
48 | | // More bytes are present |
49 | 6.14M | result |= ((byte & 127) << shift); |
50 | 6.14M | } else { |
51 | 5.86M | result |= (byte << shift); |
52 | 5.86M | *value = result; |
53 | 5.86M | return p; |
54 | 5.86M | } |
55 | 12.0M | } |
56 | 11.4k | return nullptr; |
57 | 5.87M | } |
58 | | |
59 | 2.30M | const uint8_t* decode_varint64_ptr(const uint8_t* p, const uint8_t* limit, uint64_t* value) { |
60 | 2.30M | uint64_t result = 0; |
61 | 8.66M | for (uint32_t shift = 0; shift <= 63 && p < limit; shift += 7) { |
62 | 8.66M | uint64_t byte = *p; |
63 | 8.66M | p++; |
64 | 8.66M | if (byte & 128) { |
65 | | // More bytes are present |
66 | 6.35M | result |= ((byte & 127) << shift); |
67 | 6.35M | } else { |
68 | 2.30M | result |= (byte << shift); |
69 | 2.30M | *value = result; |
70 | 2.30M | return p; |
71 | 2.30M | } |
72 | 8.66M | } |
73 | 1 | return nullptr; |
74 | 2.30M | } |
75 | | #include "common/compile_check_end.h" |
76 | | } // namespace doris |