1 files changed, 108 insertions, 0 deletions
diff --git a/src/network/access/qdecompresshelper_p.h b/src/network/access/qdecompresshelper_p.h
new file mode 100644
index 0000000000..c837c14521
--- /dev/null
+++ b/src/network/access/qdecompresshelper_p.h
@@ -0,0 +1,108 @@
+// Copyright (C) 2020 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef DECOMPRESS_HELPER_P_H
+#define DECOMPRESS_HELPER_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API. It exists for the convenience
+// of the Network Access API. This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtNetwork/private/qtnetworkglobal_p.h>
+#include <QtCore/private/qbytedata_p.h>
+
+#include <memory>
+
+QT_BEGIN_NAMESPACE
+
+class QIODevice;
+class Q_AUTOTEST_EXPORT QDecompressHelper
+{
+public:
+    enum ContentEncoding {
+        None,
+        Deflate,
+        GZip,
+        Brotli,
+        Zstandard,
+    };
+
+    QDecompressHelper() = default;
+    ~QDecompressHelper();
+
+    bool setEncoding(QByteArrayView contentEncoding);
+
+    bool isCountingBytes() const;
+    void setCountingBytesEnabled(bool shouldCount);
+
+    qint64 uncompressedSize() const;
+
+    bool hasData() const;
+    void feed(const QByteArray &data);
+    void feed(QByteArray &&data);
+    void feed(const QByteDataBuffer &buffer);
+    void feed(QByteDataBuffer &&buffer);
+    qsizetype read(char *data, qsizetype maxSize);
+
+    bool isValid() const;
+
+    void clear();
+
+    void setDecompressedSafetyCheckThreshold(qint64 threshold);
+
+    static bool isSupportedEncoding(QByteArrayView encoding);
+    static QByteArrayList acceptedEncoding();
+
+    QString errorString() const;
+
+private:
+    bool isPotentialArchiveBomb() const;
+    bool hasDataInternal() const;
+    qsizetype readInternal(char *data, qsizetype maxSize);
+
+    bool countInternal();
+    bool countInternal(const QByteArray &data);
+    bool countInternal(const QByteDataBuffer &buffer);
+
+    bool setEncoding(ContentEncoding ce);
+    qint64 encodedBytesAvailable() const;
+
+    qsizetype readZLib(char *data, qsizetype maxSize);
+    qsizetype readBrotli(char *data, qsizetype maxSize);
+    qsizetype readZstandard(char *data, qsizetype maxSize);
+
+    QByteDataBuffer compressedDataBuffer;
+    QByteDataBuffer decompressedDataBuffer;
+    const qsizetype MaxDecompressedDataBufferSize = 10 * 1024 * 1024;
+    bool decoderHasData = false;
+
+    bool countDecompressed = false;
+    std::unique_ptr<QDecompressHelper> countHelper;
+
+    QString errorStr;
+
+    // Used for calculating the ratio
+    qint64 archiveBombCheckThreshold = 10 * 1024 * 1024;
+    qint64 totalUncompressedBytes = 0;
+    qint64 totalCompressedBytes = 0;
+    qint64 totalBytesRead = 0;
+
+    ContentEncoding contentEncoding = None;
+
+    void *decoderPointer = nullptr;
+#if QT_CONFIG(brotli)
+    const uint8_t *brotliUnconsumedDataPtr = nullptr;
+    size_t brotliUnconsumedAmount = 0;
+#endif
+};
+
+QT_END_NAMESPACE
+
+#endif // DECOMPRESS_HELPER_P_H