Function introduction
Because of most file formats, the first few bytes are the "magic number" used to determine whether the file is legal. If the first 4 bytes are modified, the file usually cannot be used.
What is a file header?
The file header is a piece of data located at the beginning of the file that undertakes a certain task, usually at the beginning. As a carrier file containing functional functions and data interface declarations, the header file is used to save the declaration of the program, while the definition file is used to save the implementation of the program.
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