How to Modify or Patch the Compiled Executable (inplace, reverse engineering)?
I have a compiled .o file, and how to modify a string constant in it? for example, change “hello” to “HELLO”. Let’s take a look at this simple C …
Category: c / c++
How to PyArg_ParseTuple the bytearray in Python to C ?
How to PyArg_ParseTuple the bytearray in Python to C? For example, in Python, array = bytearray(bytes(random.choice(range(256)) * length)) and sometimes we want to pass this byte array to C …
Using CPU Intrinsics __builtin_ctz Function to Compute the Number of Trailing Zeros for a Integer (Binary)
Consider the following C/C++ function to count the number of trailing zeros for a integer (in binary form): static inline int count_trailing_zeros(int value) { int n = 0; while …
What is the CPU Intrinsics?
CPU intrinsics, also known as SIMD (Single Instruction, Multiple Data) intrinsics, are low-level programming instructions provided by modern CPUs to perform parallel computations on multiple data elements simultaneously. They …
C Implementation of the itoa Function (Integer to String Conversion)
The C standard library does not have an itoa function, but you can easily implement it by yourself. The itoa Function converts a integer value to its string representation …