/*!
\internal
*/
qint64 QFSFileEnginePrivate::nativeRead(char *data, qint64 len)
{
Q_Q(QFSFileEngine);
if (fh && nativeIsSequential()) {
size_t readBytes = 0;
int oldFlags = fcntl(QT_FILENO(fh), F_GETFL);
for (int i = 0; i < 2; ++i) {
// Unix: Make the underlying file descriptor non-blocking
int v = 1;
if ((oldFlags & O_NONBLOCK) == 0)
fcntl(QT_FILENO(fh), F_SETFL, oldFlags | O_NONBLOCK, &v, sizeof(v));
// Cross platform stdlib read
size_t read = 0;
do {
read = fread(data + readBytes, 1, size_t(len - readBytes), fh);
} while (read == 0 && !feof(fh) && errno == EINTR);
if (read > 0) {
readBytes += read;
break;
} else {
if (readBytes)
break;
readBytes = read;
}
// Unix: Restore the blocking state of the underlying socket
if ((oldFlags & O_NONBLOCK) == 0) {
int v = 1;
fcntl(QT_FILENO(fh), F_SETFL, oldFlags, &v, sizeof(v));
if (readBytes == 0) {
int readByte = 0;
do {
readByte = fgetc(fh);
} while (readByte == -1 && errno == EINTR);
if (readByte != -1) {
*data = uchar(readByte);
readBytes += 1;
} else {
break;
}
}
}
}
// Unix: Restore the blocking state of the underlying socket
if ((oldFlags & O_NONBLOCK) == 0) {
int v = 1;
fcntl(QT_FILENO(fh), F_SETFL, oldFlags, &v, sizeof(v));
}
if (readBytes == 0 && !feof(fh)) {
// if we didn't read anything and we're not at EOF, it must be an error
q->setError(QFile::ReadError, qt_error_string(int(errno)));
return -1;
}
return readBytes;
}
return readFdFh(data, len);
}
/*
\internal
*/
qint64 QFSFileEnginePrivate::nativeRead(char *data, qint64 maxlen)
{
Q_Q(QFSFileEngine);
if (fh || fd != -1) {
// stdio / stdlib mode.
if (fh && nativeIsSequential() && feof(fh)) {
q->setError(QFile::ReadError, qt_error_string(int(errno)));
return -1;
}
return readFdFh(data, maxlen);
}
// Windows native mode.
if (fileHandle == INVALID_HANDLE_VALUE)
return -1;
qint64 bytesToRead = maxlen;
// Reading on Windows fails with ERROR_NO_SYSTEM_RESOURCES when
// the chunks are too large, so we limit the block size to 32MB.
static const qint64 maxBlockSize = 32 * 1024 * 1024;
qint64 totalRead = 0;
do {
DWORD blockSize = DWORD(qMin(bytesToRead, maxBlockSize));
DWORD bytesRead;
if (!ReadFile(fileHandle, data + totalRead, blockSize, &bytesRead, NULL)) {
if (totalRead == 0) {
// Note: only return failure if the first ReadFile fails.
q->setError(QFile::ReadError, qt_error_string());
return -1;
}
break;
}
if (bytesRead == 0)
break;
totalRead += bytesRead;
bytesToRead -= bytesRead;
} while (totalRead < maxlen);
return totalRead;
}
/*!
\internal
*/
qint64 QFSFileEnginePrivate::nativeRead(char *data, qint64 len)
{
Q_Q(QFSFileEngine);
#ifdef Q_OS_SYMBIAN
if (symbianFile.SubSessionHandle()) {
if(len > KMaxTInt) {
//this check is more likely to catch a corrupt length, since it isn't possible to allocate 2GB buffers (yet..)
q->setError(QFile::ReadError, QLatin1String("Maximum 2GB in single read on this platform"));
return -1;
}
TPtr8 ptr(reinterpret_cast<TUint8*>(data), static_cast<TInt>(len));
TInt r = symbianFile.Read(symbianFilePos, ptr);
if (r != KErrNone)
{
q->setError(QFile::ReadError, QSystemError(r, QSystemError::NativeError).toString());
return -1;
}
symbianFilePos += ptr.Length();
return qint64(ptr.Length());
}
#endif
if (fh && nativeIsSequential()) {
size_t readBytes = 0;
int oldFlags = fcntl(QT_FILENO(fh), F_GETFL);
for (int i = 0; i < 2; ++i) {
// Unix: Make the underlying file descriptor non-blocking
if ((oldFlags & O_NONBLOCK) == 0)
fcntl(QT_FILENO(fh), F_SETFL, oldFlags | O_NONBLOCK);
// Cross platform stdlib read
size_t read = 0;
do {
read = fread(data + readBytes, 1, size_t(len - readBytes), fh);
} while (read == 0 && !feof(fh) && errno == EINTR);
if (read > 0) {
readBytes += read;
break;
} else {
if (readBytes)
break;
readBytes = read;
}
// Unix: Restore the blocking state of the underlying socket
if ((oldFlags & O_NONBLOCK) == 0) {
fcntl(QT_FILENO(fh), F_SETFL, oldFlags);
if (readBytes == 0) {
int readByte = 0;
do {
readByte = fgetc(fh);
} while (readByte == -1 && errno == EINTR);
if (readByte != -1) {
*data = uchar(readByte);
readBytes += 1;
} else {
break;
}
}
}
}
// Unix: Restore the blocking state of the underlying socket
if ((oldFlags & O_NONBLOCK) == 0) {
fcntl(QT_FILENO(fh), F_SETFL, oldFlags);
}
if (readBytes == 0 && !feof(fh)) {
// if we didn't read anything and we're not at EOF, it must be an error
q->setError(QFile::ReadError, qt_error_string(int(errno)));
return -1;
}
return readBytes;
}
return readFdFh(data, len);
}
