I have a C / C++ program which needs to read in a file that may or may not be gzip compressed. I know we can use gzread() from zlib to read in both compressed and uncompressed files - however, I want to use the zlib functions ONLY if the file is gzip compressed (for performance reasons).
那么有没有办法以编程方式检测或检查某个文件是否是从 C/C++ 压缩的?
So is there any way to programatically detect or check if a certain file is gzipped from C / C++?
推荐答案
文件开头有一个幻数.只需读取前两个字节并检查它们是否等于 0x1f8b.
There is a magic number at the beginning of the file. Just read the first two bytes and check if they are equal to 0x1f8b.
What is inside .lib file of Static library, Statically linked dynamic library and dynamically linked dynamic library?(静态库、静态链接动态库和动态链接动态库的 .lib 文件里面是什么?)
