1// Copyright (C) 2021 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#ifndef QBYTEARRAYALGORITHMS_H
5#define QBYTEARRAYALGORITHMS_H
6
7#include <QtCore/qnamespace.h>
8
9#include <string.h>
10#include <stdarg.h>
11
12#if 0
13#pragma qt_class(QByteArrayAlgorithms)
14#endif
15
16QT_BEGIN_NAMESPACE
17
18class QByteArrayView;
19
20namespace QtPrivate {
21
22[[nodiscard]] Q_CORE_EXPORT Q_DECL_PURE_FUNCTION
23bool startsWith(QByteArrayView haystack, QByteArrayView needle) noexcept;
24
25[[nodiscard]] Q_CORE_EXPORT Q_DECL_PURE_FUNCTION
26bool endsWith(QByteArrayView haystack, QByteArrayView needle) noexcept;
27
28[[nodiscard]] inline // defined in qbytearrayview.h
29qsizetype findByteArray(QByteArrayView haystack, qsizetype from, char needle) noexcept;
30
31[[nodiscard]] Q_CORE_EXPORT Q_DECL_PURE_FUNCTION
32qsizetype findByteArray(QByteArrayView haystack, qsizetype from, QByteArrayView needle) noexcept;
33
34[[nodiscard]] inline // defined in qbytearrayview.h
35qsizetype lastIndexOf(QByteArrayView haystack, qsizetype from, uchar needle) noexcept;
36
37[[nodiscard]] Q_CORE_EXPORT Q_DECL_PURE_FUNCTION
38qsizetype lastIndexOf(QByteArrayView haystack, qsizetype from, QByteArrayView needle) noexcept;
39
40[[nodiscard]] Q_CORE_EXPORT Q_DECL_PURE_FUNCTION
41qsizetype count(QByteArrayView haystack, QByteArrayView needle) noexcept;
42
43[[nodiscard]] Q_CORE_EXPORT int compareMemory(QByteArrayView lhs, QByteArrayView rhs);
44
45[[nodiscard]] Q_CORE_EXPORT Q_DECL_PURE_FUNCTION QByteArrayView trimmed(QByteArrayView s) noexcept;
46
47[[nodiscard]] Q_CORE_EXPORT Q_DECL_PURE_FUNCTION bool isValidUtf8(QByteArrayView s) noexcept;
48
49template <typename T>
50class ParsedNumber
51{
52 T m_value;
53 quint32 m_error : 1;
54 quint32 m_reserved : 31;
55 void *m_reserved2 = nullptr;
56public:
57 constexpr ParsedNumber() noexcept : m_value(), m_error(true), m_reserved(0) {}
58 constexpr explicit ParsedNumber(T v) : m_value(v), m_error(false), m_reserved(0) {}
59
60 // minimal optional-like API:
61 explicit operator bool() const noexcept { return !m_error; }
62 T &operator*() { Q_ASSERT(*this); return m_value; }
63 const T &operator*() const { Q_ASSERT(*this); return m_value; }
64 T *operator->() noexcept { return *this ? &m_value : nullptr; }
65 const T *operator->() const noexcept { return *this ? &m_value : nullptr; }
66 template <typename U> // not = T, as that'd allow calls that are incompatible with std::optional
67 T value_or(U &&u) const { return *this ? m_value : T(std::forward<U>(u)); }
68};
69
70[[nodiscard]] Q_CORE_EXPORT Q_DECL_PURE_FUNCTION ParsedNumber<double> toDouble(QByteArrayView a) noexcept;
71[[nodiscard]] Q_CORE_EXPORT Q_DECL_PURE_FUNCTION ParsedNumber<float> toFloat(QByteArrayView a) noexcept;
72[[nodiscard]] Q_CORE_EXPORT Q_DECL_PURE_FUNCTION ParsedNumber<qlonglong> toSignedInteger(QByteArrayView data, int base);
73[[nodiscard]] Q_CORE_EXPORT Q_DECL_PURE_FUNCTION ParsedNumber<qulonglong> toUnsignedInteger(QByteArrayView data, int base);
74
75// QByteArrayView has incomplete type here, and we can't include qbytearrayview.h,
76// since it includes qbytearrayalgorithms.h. Use the ByteArrayView template type as
77// a workaround.
78template <typename T, typename ByteArrayView,
79 typename = std::enable_if_t<std::is_same_v<ByteArrayView, QByteArrayView>>>
80static inline T toIntegral(ByteArrayView data, bool *ok, int base)
81{
82 const auto val = [&] {
83 if constexpr (std::is_unsigned_v<T>)
84 return toUnsignedInteger(data, base);
85 else
86 return toSignedInteger(data, base);
87 }();
88 const bool failed = !val || T(*val) != *val;
89 if (ok)
90 *ok = !failed;
91 if (failed)
92 return 0;
93 return T(*val);
94}
95
96} // namespace QtPrivate
97
98/*****************************************************************************
99 Safe and portable C string functions; extensions to standard string.h
100 *****************************************************************************/
101
102[[nodiscard]] Q_DECL_PURE_FUNCTION Q_CORE_EXPORT
103const void *qmemrchr(const void *s, int needle, size_t n) noexcept;
104Q_CORE_EXPORT char *qstrdup(const char *);
105
106inline size_t qstrlen(const char *str)
107{
108 QT_WARNING_PUSH
109#if defined(Q_CC_GNU_ONLY) && Q_CC_GNU >= 900 && Q_CC_GNU < 1000
110 // spurious compiler warning (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91490#c6)
111 // when Q_DECLARE_METATYPE_TEMPLATE_1ARG is used
112 QT_WARNING_DISABLE_GCC("-Wstringop-overflow")
113#endif
114 return str ? strlen(s: str) : 0;
115 QT_WARNING_POP
116}
117
118inline size_t qstrnlen(const char *str, size_t maxlen)
119{
120 if (!str)
121 return 0;
122 auto end = static_cast<const char *>(memchr(s: str, c: '\0', n: maxlen));
123 return end ? end - str : maxlen;
124}
125
126// implemented in qbytearray.cpp
127Q_CORE_EXPORT char *qstrcpy(char *dst, const char *src);
128Q_CORE_EXPORT char *qstrncpy(char *dst, const char *src, size_t len);
129
130Q_CORE_EXPORT int qstrcmp(const char *str1, const char *str2);
131
132inline int qstrncmp(const char *str1, const char *str2, size_t len)
133{
134 return (str1 && str2) ? strncmp(s1: str1, s2: str2, n: len)
135 : (str1 ? 1 : (str2 ? -1 : 0));
136}
137Q_CORE_EXPORT int qstricmp(const char *, const char *);
138Q_CORE_EXPORT int qstrnicmp(const char *, const char *, size_t len);
139Q_CORE_EXPORT int qstrnicmp(const char *, qsizetype, const char *, qsizetype = -1);
140
141#ifndef QT_NO_QSNPRINTF // use std::(v)snprintf() from <cstdio> instead
142// implemented in qvsnprintf.cpp
143Q_CORE_EXPORT int qvsnprintf(char *str, size_t n, const char *fmt, va_list ap)
144 Q_ATTRIBUTE_FORMAT_PRINTF(3, 0);
145Q_CORE_EXPORT int qsnprintf(char *str, size_t n, const char *fmt, ...)
146 Q_ATTRIBUTE_FORMAT_PRINTF(3, 4);
147#endif // QT_NO_QSNPRINTF
148
149// qChecksum: Internet checksum
150Q_CORE_EXPORT quint16 qChecksum(QByteArrayView data, Qt::ChecksumType standard = Qt::ChecksumIso3309);
151
152QT_END_NAMESPACE
153
154#endif // QBYTEARRAYALGORITHMS_H
155

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source code of qtbase/src/corelib/text/qbytearrayalgorithms.h