Check to make sure we have a valid db pointer. This test is not ** foolproof but it does provide some measure of protection against ** misuse of the interface such as passing in db pointers that are ** NULL or which have been previously closed. If this routine returns ** 1 it means that the db pointer is valid and 0 if it should not be ** dereferenced for any reason. The calling function should invoke ** SQLITE_MISUSE immediately. ** ** sqlite3SafetyCheckOk() requires that the db pointer be valid for ** use. sqlite3SafetyCheckSickOrOk() allows a db pointer that failed to ** open properly and is not fit for general use but which can be ** used as an argument to sqlite3_errmsg() or sqlite3_close().翻译
时间: 2023-07-19 07:56:47 浏览: 56
这段代码注释的作用是检查数据库指针是否有效。这个检测不是绝对可靠的,但它可以提供一定程度的保护,防止接口被误用,例如传递空指针或已经关闭的指针。如果这个函数返回1,表示数据库指针有效;如果返回0,表示不应该对其进行任何解引用操作。调用该函数的函数应立即调用SQLITE_MISUSE。sqlite3SafetyCheckOk()要求数据库指针有效使用,而sqlite3SafetyCheckSickOrOk()允许一个打开失败且不适合一般使用的数据库指针,但可以用作sqlite3_errmsg()或sqlite3_close()的参数。
相关问题
steganogan: high capacity image steganography with gans
Steganogan is a type of high-capacity image steganography that uses GANs (Generative Adversarial Networks) to hide secret data within images. The basic idea behind steganography is to conceal a message or data within another file, such as an image, without anyone else knowing it's there. This can be useful for a variety of purposes, such as keeping sensitive information secure or transmitting data in a covert manner.
Steganography techniques typically involve encoding the secret data into the image in a way that is difficult to detect. Steganogan takes this a step further by using GANs to generate images that contain the hidden data. The GANs are trained to create images that are visually similar to the original images, but with a few subtle changes that encode the secret data.
One of the advantages of using GANs for steganography is that they can create images with a high degree of realism and detail, which makes it difficult for someone to detect that there is hidden data within the image. However, this also means that the capacity for hiding data within the image is limited, as there is only so much data that can be encoded without significantly altering the appearance of the image.
Overall, steganography techniques like Steganogan can be a useful tool for keeping data secure and transmitting information in a covert manner. However, it's important to remember that these techniques are not foolproof and can be detected with sophisticated analysis tools.