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Prevent Digest32 shared data from being detached

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Delayed hash string generation should not cause detaching of shared data.

PR #16664.
This commit is contained in:
Vladimir Golovnev 2022-03-20 12:26:13 +03:00 committed by GitHub
parent 5960e7dda6
commit ca2be2f499
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 59 additions and 33 deletions
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92
src/base/digest32.h
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@ -48,10 +48,8 @@ public:
Digest32(Digest32 &&other) = default;
Digest32(const UnderlyingType &nativeDigest)
: m_dataPtr {new Data(nativeDigest)}
{
m_dataPtr->valid = true;
m_dataPtr->nativeDigest = nativeDigest;
m_dataPtr->hashString.clear(); // hashString is created on demand
}
static constexpr int length()
@ -61,7 +59,7 @@ public:
bool isValid() const
{
return m_dataPtr->valid;
return m_dataPtr->isValid();
}
Digest32 &operator=(const Digest32 &other) = default;
@ -69,48 +67,76 @@ public:
operator UnderlyingType() const
{
return m_dataPtr->nativeDigest;
}
static Digest32 fromString(const QString &digestString)
{
if (digestString.size() != (length() * 2))
return {};
const QByteArray raw = QByteArray::fromHex(digestString.toLatin1());
if (raw.size() != length()) // QByteArray::fromHex() will skip over invalid characters
return {};
Digest32 result;
result.m_dataPtr->valid = true;
result.m_dataPtr->hashString = digestString;
result.m_dataPtr->nativeDigest.assign(raw.constData());
return result;
return m_dataPtr->nativeDigest();
}
QString toString() const
{
if (m_dataPtr->hashString.isEmpty())
{
const QByteArray raw = QByteArray::fromRawData(m_dataPtr->nativeDigest.data(), length());
const_cast<Digest32 *>(this)->m_dataPtr->hashString = QString::fromLatin1(raw.toHex());
}
return m_dataPtr->hashString();
}
return m_dataPtr->hashString;
static Digest32 fromString(const QString &digestString)
{
return Digest32(QSharedDataPointer<Data>(new Data(digestString)));
}
private:
struct Data : public QSharedData
class Data;
explicit Digest32(QSharedDataPointer<Data> dataPtr)
: m_dataPtr {dataPtr}
{
bool valid = false;
UnderlyingType nativeDigest;
QString hashString;
};
}
QSharedDataPointer<Data> m_dataPtr {new Data};
};
template <int N>
class Digest32<N>::Data : public QSharedData
{
public:
Data() = default;
explicit Data(UnderlyingType nativeDigest)
: m_isValid {true}
, m_nativeDigest {nativeDigest}
{
}
explicit Data(const QString &digestString)
{
if (digestString.size() != (length() * 2))
return;
const QByteArray raw = QByteArray::fromHex(digestString.toLatin1());
if (raw.size() != length()) // QByteArray::fromHex() will skip over invalid characters
return;
m_isValid = true;
m_hashString = digestString;
m_nativeDigest.assign(raw.constData());
}
bool isValid() const { return m_isValid; }
UnderlyingType nativeDigest() const { return m_nativeDigest; }
QString hashString() const
{
if (m_hashString.isEmpty())
{
const QByteArray raw = QByteArray::fromRawData(m_nativeDigest.data(), length());
m_hashString = QString::fromLatin1(raw.toHex());
}
return m_hashString;
}
private:
bool m_isValid = false;
UnderlyingType m_nativeDigest;
mutable QString m_hashString;
};
template <int N>
bool operator==(const Digest32<N> &left, const Digest32<N> &right)
{