| 1 | /* |
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| 2 | This file is part of the KDE Baloo project. |
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| 3 | SPDX-FileCopyrightText: 2015 Vishesh Handa <vhanda@kde.org> |
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| 4 | SPDX-FileCopyrightText: 2011 The LevelDB Authors. All rights reserved. |
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| 5 | |
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| 6 | SPDX-License-Identifier: LGPL-2.1-or-later AND BSD-3-Clause |
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| 7 | */ |
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| 8 | |
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| 9 | #ifndef BALOO_STORAGE_LEVELDB_UTIL_CODING_H |
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| 10 | #define BALOO_STORAGE_LEVELDB_UTIL_CODING_H |
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| 11 | |
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| 12 | #include <QByteArray> |
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| 13 | #include <QVector> |
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| 14 | |
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| 15 | namespace Baloo { |
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| 16 | |
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| 17 | /* |
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| 18 | * This is a stripped down version of various encode/decode functions for |
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| 19 | * 32/64 bit fixed/variable data types. If you need other functions than the |
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| 20 | * ones available here you can take a look in the git baloo history |
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| 21 | */ |
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| 22 | |
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| 23 | inline void putFixed64(QByteArray* dst, quint64 value) |
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| 24 | { |
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| 25 | dst->append(s: reinterpret_cast<const char*>(&value), len: sizeof(value)); |
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| 26 | } |
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| 27 | |
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| 28 | /* |
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| 29 | * temporaryStorage is used to avoid an internal allocation of a temporary |
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| 30 | * buffer which is needed for serialization. Since this function is normally |
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| 31 | * called inside a loop, the temporary buffer must not be reallocated on every |
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| 32 | * call. |
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| 33 | */ |
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| 34 | void putDifferentialVarInt32(QByteArray &temporaryStorage, QByteArray* dst, const QVector<quint32>& values); |
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| 35 | char* getDifferentialVarInt32(char* input, char* limit, QVector<quint32>* values); |
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| 36 | extern const char* getVarint32Ptr(const char* p, const char* limit, quint32* v); |
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| 37 | |
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| 38 | inline quint64 decodeFixed64(const char* ptr) |
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| 39 | { |
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| 40 | // Load the raw bytes |
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| 41 | quint64 result; |
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| 42 | memcpy(dest: &result, src: ptr, n: sizeof(result)); // gcc optimizes this to a plain load |
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| 43 | return result; |
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| 44 | } |
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| 45 | |
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| 46 | // Internal routine for use by fallback path of GetVarint32Ptr |
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| 47 | extern char* getVarint32PtrFallback(char* p, char* limit, quint32* value); |
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| 48 | inline char* getVarint32Ptr(char* p, char* limit, quint32* value) |
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| 49 | { |
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| 50 | if (p >= limit) { |
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| 51 | return nullptr; |
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| 52 | } |
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| 53 | |
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| 54 | quint32 result = *(reinterpret_cast<const unsigned char*>(p)); |
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| 55 | if ((result & 128) == 0) { |
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| 56 | *value = result; |
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| 57 | return p + 1; |
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| 58 | } |
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| 59 | |
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| 60 | return getVarint32PtrFallback(p, limit, value); |
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| 61 | } |
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| 62 | |
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| 63 | } |
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| 64 | |
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| 65 | #endif |
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| 66 | |
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