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39
40#include "qplatformdefs.h"
41#include "qfilesystemiterator_p.h"
42
43#if QT_CONFIG(textcodec)
44# include <qtextcodec.h>
45# include <private/qutfcodec_p.h>
46#endif
47
48#ifndef QT_NO_FILESYSTEMITERATOR
49
50#include <memory>
51
52#include <stdlib.h>
53#include <errno.h>
54
55QT_BEGIN_NAMESPACE
56
57static bool checkNameDecodable(const char *d_name, qsizetype len)
58{
59 // This function is called in a loop from advance() below, but the loop is
60 // usually run only once.
61
62#if QT_CONFIG(textcodec)
63 // We identify the codecs by their RFC 2978 MIBenum values. In this
64 // function:
65 // 3 US-ASCII (ANSI X3.4-1986)
66 // 4 Latin1 (ISO-8859-1)
67 // 106 UTF-8
68 QTextCodec *codec = QTextCodec::codecForLocale();
69# ifdef QT_LOCALE_IS_UTF8
70 int mibEnum = 106;
71# else
72 int mibEnum = codec->mibEnum();
73# endif
74 if (Q_LIKELY(mibEnum == 106)) // UTF-8
75 return QUtf8::isValidUtf8(d_name, len).isValidUtf8;
76 if (mibEnum == 3) // US-ASCII
77 return QtPrivate::isAscii(QLatin1String(d_name, len));
78 if (mibEnum == 4) // Latin 1
79 return true;
80
81 // fall back to generic QTextCodec
82 QTextCodec::ConverterState cs(QTextCodec::IgnoreHeader);
83 codec->toUnicode(d_name, len, &cs);
84 return cs.invalidChars == 0 && cs.remainingChars == 0;
85#else
86 // if we have no text codecs, then QString::fromLocal8Bit is fromLatin1
87 return true;
88#endif
89}
90
91QFileSystemIterator::QFileSystemIterator(const QFileSystemEntry &entry, QDir::Filters filters,
92 const QStringList &nameFilters, QDirIterator::IteratorFlags flags)
93 : nativePath(entry.nativeFilePath())
94 , dir(nullptr)
95 , dirEntry(nullptr)
96 , lastError(0)
97{
98 Q_UNUSED(filters)
99 Q_UNUSED(nameFilters)
100 Q_UNUSED(flags)
101
102 if ((dir = QT_OPENDIR(nativePath.constData())) == nullptr) {
103 lastError = errno;
104 } else {
105 if (!nativePath.endsWith('/'))
106 nativePath.append('/');
107 }
108}
109
110QFileSystemIterator::~QFileSystemIterator()
111{
112 if (dir)
113 QT_CLOSEDIR(dir);
114}
115
116bool QFileSystemIterator::advance(QFileSystemEntry &fileEntry, QFileSystemMetaData &metaData)
117{
118 if (!dir)
119 return false;
120
121 for (;;) {
122 dirEntry = QT_READDIR(dir);
123
124 if (dirEntry) {
125 qsizetype len = strlen(dirEntry->d_name);
126 if (checkNameDecodable(dirEntry->d_name, len)) {
127 fileEntry = QFileSystemEntry(nativePath + QByteArray(dirEntry->d_name, len), QFileSystemEntry::FromNativePath());
128 metaData.fillFromDirEnt(*dirEntry);
129 return true;
130 }
131 } else {
132 break;
133 }
134 }
135
136 lastError = errno;
137 return false;
138}
139
140QT_END_NAMESPACE
141
142#endif // QT_NO_FILESYSTEMITERATOR
143