c++ - 如何实现二进制文件对比

Question

如题。我需要实现一个类似于Hex Comparison这样的工具。Hex的实现不成问题，就是想知道如何实现两个二进制文件的对比？不需要合并只需要对比。 有现成的轮子可以让我直接调用然后得到两个文件的差异吗？

Answer 1

Provide several methods for reference:

1. Using the diff/cmp command on the command line, you can determine whether the two binaries are exactly the same:

   diff file1 file2
   cmp -b file1 file2

2. hexdump under the command line, after getting the hex text, use diff to compare the hex text of the two files:

   hexdump file1.bin > file1.hex
   hexdump file2.bin > file2.hex
   diff file1.hex file2.hex

3. Calculate the MD5 or SHA1 of these two files. If the hash values ​​obtained are the same, they are the same file