projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae | 1 | // Copyright (c) 2011-present, Facebook, Inc. All rights reserved. |
| 11fdf7f2 TL |
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). | |
| 7c673cae FG |
5 | // |
| 6 | // Copyright (c) 2011 The LevelDB Authors. All rights reserved. | |
| 7 | // Use of this source code is governed by a BSD-style license that can be | |
| 8 | // found in the LICENSE file. See the AUTHORS file for names of contributors. | |
| 9 | ||
| 10 | #include "util/coding.h" | |
| 11 | ||
| 12 | #include <algorithm> | |
| 1e59de90 | 13 | |
| 7c673cae FG |
14 | #include "rocksdb/slice.h" |
| 15 | #include "rocksdb/slice_transform.h" | |
| 16 | ||
| f67539c2 | 17 | namespace ROCKSDB_NAMESPACE { |
| 7c673cae | 18 | |
| 11fdf7f2 TL |
19 | // conversion' conversion from 'type1' to 'type2', possible loss of data |
| 20 | #if defined(_MSC_VER) | |
| 21 | #pragma warning(push) | |
| 22 | #pragma warning(disable : 4244) | |
| 23 | #endif | |
| 7c673cae FG |
24 | char* EncodeVarint32(char* dst, uint32_t v) { |
| 25 | // Operate on characters as unsigneds | |
| 26 | unsigned char* ptr = reinterpret_cast<unsigned char*>(dst); | |
| 27 | static const int B = 128; | |
| 28 | if (v < (1 << 7)) { | |
| 29 | *(ptr++) = v; | |
| 30 | } else if (v < (1 << 14)) { | |
| 31 | *(ptr++) = v | B; | |
| 32 | *(ptr++) = v >> 7; | |
| 33 | } else if (v < (1 << 21)) { | |
| 34 | *(ptr++) = v | B; | |
| 35 | *(ptr++) = (v >> 7) | B; | |
| 36 | *(ptr++) = v >> 14; | |
| 37 | } else if (v < (1 << 28)) { | |
| 38 | *(ptr++) = v | B; | |
| 39 | *(ptr++) = (v >> 7) | B; | |
| 40 | *(ptr++) = (v >> 14) | B; | |
| 41 | *(ptr++) = v >> 21; | |
| 42 | } else { | |
| 43 | *(ptr++) = v | B; | |
| 44 | *(ptr++) = (v >> 7) | B; | |
| 45 | *(ptr++) = (v >> 14) | B; | |
| 46 | *(ptr++) = (v >> 21) | B; | |
| 47 | *(ptr++) = v >> 28; | |
| 48 | } | |
| 49 | return reinterpret_cast<char*>(ptr); | |
| 50 | } | |
| 11fdf7f2 TL |
51 | #if defined(_MSC_VER) |
| 52 | #pragma warning(pop) | |
| 53 | #endif | |
| 7c673cae FG |
54 | |
| 55 | const char* GetVarint32PtrFallback(const char* p, const char* limit, | |
| 56 | uint32_t* value) { | |
| 57 | uint32_t result = 0; | |
| 58 | for (uint32_t shift = 0; shift <= 28 && p < limit; shift += 7) { | |
| 59 | uint32_t byte = *(reinterpret_cast<const unsigned char*>(p)); | |
| 60 | p++; | |
| 61 | if (byte & 128) { | |
| 62 | // More bytes are present | |
| 63 | result |= ((byte & 127) << shift); | |
| 64 | } else { | |
| 65 | result |= (byte << shift); | |
| 66 | *value = result; | |
| 67 | return reinterpret_cast<const char*>(p); | |
| 68 | } | |
| 69 | } | |
| 70 | return nullptr; | |
| 71 | } | |
| 72 | ||
| 73 | const char* GetVarint64Ptr(const char* p, const char* limit, uint64_t* value) { | |
| 74 | uint64_t result = 0; | |
| 75 | for (uint32_t shift = 0; shift <= 63 && p < limit; shift += 7) { | |
| 76 | uint64_t byte = *(reinterpret_cast<const unsigned char*>(p)); | |
| 77 | p++; | |
| 78 | if (byte & 128) { | |
| 79 | // More bytes are present | |
| 80 | result |= ((byte & 127) << shift); | |
| 81 | } else { | |
| 82 | result |= (byte << shift); | |
| 83 | *value = result; | |
| 84 | return reinterpret_cast<const char*>(p); | |
| 85 | } | |
| 86 | } | |
| 87 | return nullptr; | |
| 88 | } | |
| 89 | ||
| f67539c2 | 90 | } // namespace ROCKSDB_NAMESPACE |