| /**************************************************************************** |
| ** |
| ** Copyright (C) 2015 The Qt Company Ltd. |
| ** Contact: http://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtCore module of the Qt Toolkit. |
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| ** $QT_BEGIN_LICENSE:LGPL21$ |
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| ****************************************************************************/ |
| |
| #ifndef QIODEVICE_P_H |
| #define QIODEVICE_P_H |
| |
| // |
| // W A R N I N G |
| // ------------- |
| // |
| // This file is not part of the Qt API. It exists for the convenience |
| // of QIODevice. This header file may change from version to |
| // version without notice, or even be removed. |
| // |
| // We mean it. |
| // |
| |
| #include "QtCore/qiodevice.h" |
| #include "QtCore/qbytearray.h" |
| #include "QtCore/qobjectdefs.h" |
| #include "QtCore/qstring.h" |
| #include "private/qringbuffer_p.h" |
| #ifndef QT_NO_QOBJECT |
| #include "private/qobject_p.h" |
| #endif |
| |
| QT_BEGIN_NAMESPACE |
| |
| #ifndef QIODEVICE_BUFFERSIZE |
| #define QIODEVICE_BUFFERSIZE Q_INT64_C(16384) |
| #endif |
| |
| Q_CORE_EXPORT int qt_subtract_from_timeout(int timeout, int elapsed); |
| |
| // This is QIODevice's read buffer, optimized for read(), isEmpty() and getChar() |
| class QIODevicePrivateLinearBuffer |
| { |
| public: |
| QIODevicePrivateLinearBuffer(int) : len(0), first(0), buf(0), capacity(0) { |
| } |
| ~QIODevicePrivateLinearBuffer() { |
| delete [] buf; |
| } |
| void clear() { |
| len = 0; |
| delete [] buf; |
| buf = 0; |
| first = buf; |
| capacity = 0; |
| } |
| qint64 size() const { |
| return len; |
| } |
| bool isEmpty() const { |
| return len == 0; |
| } |
| void skip(qint64 n) { |
| if (n >= len) { |
| clear(); |
| } else { |
| len -= n; |
| first += n; |
| } |
| } |
| int getChar() { |
| if (len == 0) |
| return -1; |
| int ch = uchar(*first); |
| len--; |
| first++; |
| return ch; |
| } |
| qint64 read(char* target, qint64 size) { |
| qint64 r = qMin(size, len); |
| memcpy(target, first, r); |
| len -= r; |
| first += r; |
| return r; |
| } |
| qint64 peek(char* target, qint64 size) { |
| qint64 r = qMin(size, len); |
| memcpy(target, first, r); |
| return r; |
| } |
| char* reserve(qint64 size) { |
| makeSpace(size + len, freeSpaceAtEnd); |
| char* writePtr = first + len; |
| len += size; |
| return writePtr; |
| } |
| void chop(qint64 size) { |
| if (size >= len) { |
| clear(); |
| } else { |
| len -= size; |
| } |
| } |
| QByteArray readAll() { |
| QByteArray retVal(first, len); |
| clear(); |
| return retVal; |
| } |
| qint64 readLine(char* target, qint64 size) { |
| qint64 r = qMin(size, len); |
| char* eol = static_cast<char*>(memchr(first, '\n', r)); |
| if (eol) |
| r = 1+(eol-first); |
| memcpy(target, first, r); |
| len -= r; |
| first += r; |
| return r; |
| } |
| bool canReadLine() const { |
| return memchr(first, '\n', len); |
| } |
| void ungetChar(char c) { |
| if (first == buf) { |
| // underflow, the existing valid data needs to move to the end of the (potentially bigger) buffer |
| makeSpace(len+1, freeSpaceAtStart); |
| } |
| first--; |
| len++; |
| *first = c; |
| } |
| void ungetBlock(const char* block, qint64 size) { |
| if ((first - buf) < size) { |
| // underflow, the existing valid data needs to move to the end of the (potentially bigger) buffer |
| makeSpace(len + size, freeSpaceAtStart); |
| } |
| first -= size; |
| len += size; |
| memcpy(first, block, size); |
| } |
| |
| private: |
| enum FreeSpacePos {freeSpaceAtStart, freeSpaceAtEnd}; |
| void makeSpace(size_t required, FreeSpacePos where) { |
| size_t newCapacity = qMax(capacity, size_t(QIODEVICE_BUFFERSIZE)); |
| while (newCapacity < required) |
| newCapacity *= 2; |
| const size_t moveOffset = (where == freeSpaceAtEnd) ? 0 : newCapacity - size_t(len); |
| if (newCapacity > capacity) { |
| // allocate more space |
| char* newBuf = new char[newCapacity]; |
| memmove(newBuf + moveOffset, first, len); |
| delete [] buf; |
| buf = newBuf; |
| capacity = newCapacity; |
| } else { |
| // shift any existing data to make space |
| memmove(buf + moveOffset, first, len); |
| } |
| first = buf + moveOffset; |
| } |
| |
| private: |
| // length of the unread data |
| qint64 len; |
| // start of the unread data |
| char* first; |
| // the allocated buffer |
| char* buf; |
| // allocated buffer size |
| size_t capacity; |
| }; |
| |
| class Q_CORE_EXPORT QIODevicePrivate |
| #ifndef QT_NO_QOBJECT |
| : public QObjectPrivate |
| #endif |
| { |
| Q_DECLARE_PUBLIC(QIODevice) |
| |
| public: |
| QIODevicePrivate(); |
| virtual ~QIODevicePrivate(); |
| |
| QIODevice::OpenMode openMode; |
| QString errorString; |
| |
| QIODevicePrivateLinearBuffer buffer; |
| qint64 pos; |
| qint64 devicePos; |
| bool baseReadLineDataCalled; |
| bool firstRead; |
| |
| virtual bool putCharHelper(char c); |
| |
| enum AccessMode { |
| Unset, |
| Sequential, |
| RandomAccess |
| }; |
| mutable AccessMode accessMode; |
| inline bool isSequential() const |
| { |
| if (accessMode == Unset) |
| accessMode = q_func()->isSequential() ? Sequential : RandomAccess; |
| return accessMode == Sequential; |
| } |
| |
| virtual qint64 peek(char *data, qint64 maxSize); |
| virtual QByteArray peek(qint64 maxSize); |
| |
| #ifdef QT_NO_QOBJECT |
| QIODevice *q_ptr; |
| #endif |
| }; |
| |
| QT_END_NAMESPACE |
| |
| #endif // QIODEVICE_P_H |