Crypto++ 的自定义源代码

Question

我已经为二进制 I/O 创建了自己的自定义流 classes。现在我试图让它们与 Crypto++ 库兼容。我找到了一个处理自定义接收器并实现了我自己的。现在我需要实现一个来源。我搜索了文档，似乎有一个巨大的继承层次结构，所以我还看不懂。

有人可以提供示例代码吗？

这是我的直播部分 class:

/// \brief Base class for a binary input stream.
/// \details Binary streams are used for low level unformatted I/O. Built on top
/// of standard streams, this system takes care of endianness and provides
/// convenient << and >> overloads. This class is designed to mirror
/// std::istream.

class BinaryInputStream : public virtual BinaryStreamBase
{
public:
    /// \brief Returns whether last I/O operation has completed successfully.
    /// \return True if last I/O operation has completed successfully,
    /// false otherwise.
    virtual bool IsGood() const = 0;

    /// \brief Returns whether end-of-file has been reached.
    /// \return True if end-of-file has been reached, false otherwise.
    virtual bool IsEOF() const = 0;

    /// \brief Returns whether recoverable error has occured.
    /// \return True if recoverable error has occured, false otherwise.
    virtual bool IsFail() const = 0;

    /// \brief Returns whether non-recoverable error has occured.
    /// \return True if non-recoverable error has occured, false otherwise.
    virtual bool IsBad() const = 0;

    /// \brief Reads a sequence of bytes from the stream.
    /// \param[in,out] buffer Buffer to write to.
    /// \param[in] size Number of bytes to read.
    /// \return Reference to this stream.
    /// \warning You are responsible for allocating the buffer and ensuring that
    /// it contains enough space to hold the data. If number of bytes to read is
    /// greater than the size of the buffer, the behavior is undefined.
    virtual BinaryInputStream& Read(char* buffer, std::size_t size) = 0;
};

Answer 1

我不得不查看 crypto++ 的源代码并从 FileSource class. The relevant files are files.h and files.cpp 复制大部分实现。

首先，我们需要看一下FileSource class. It inherits from SourceTemplate<FileStore>. So we need to examine FileStoreclass。它继承自 Store、FilterPutSpaceHelper 和 NotCopyable。我们需要创建 class 也继承自这些 classes.

我们的商店 class 必须具有默认构造函数并实现以下虚函数：TransferTo2、CopyRangeTo2 和 StoreInitialize。 StoreInitialize 可以是私有的。

最后，我们的源代码 class 只需要构造函数，如果您查看 files.h, FileSource 完全在头文件中实现。

完整的实现代码仅限于 files.h and files.cpp，因此无需在此答案中复制它。

Crypto++ 的自定义源代码

Custom source for Crypto++

c++

crypto++