Convert Hex String to Bytes in Python

C strings conversion to Python

Last Updated : 02 Apr, 2019

For C strings represented as a pair char *, int, it is to decide whether or not – the string presented as a raw byte string or as a Unicode string.

Byte objects can be built using Py_BuildValue() as

// Pointer to C string data 
char *s;  
  
// Length of data  
int len;  
  
// Make a bytes object 
PyObject *obj = Py_BuildValue("y#", s, len); 

To create a Unicode string and is it is known that s points to data encoded as UTF-8, the code given below can be used as –

PyObject *obj = Py_BuildValue("s#", s, len);

If s is encoded in some other known encoding, a string using PyUnicode_Decode() can be made as:

PyObject *obj = PyUnicode_Decode(s, len, "encoding", "errors"); 
  
// Example 
obj = PyUnicode_Decode(s, len, "latin-1", "strict"); 
obj = PyUnicode_Decode(s, len, "ascii", "ignore"); 

If a wide string needs to be represented as wchar_t *, len pair. Then are few options as shown below –

// Wide character string 
wchar_t *w; 
  
// Length 
int len;  
  
// Option 1 - use Py_BuildValue() 
PyObject *obj = Py_BuildValue("u#", w, len); 
  
// Option 2 - use PyUnicode_FromWideChar() 
PyObject *obj = PyUnicode_FromWideChar(w, len); 

The data from C must be explicitly decoded into a string according to some codec
Common encodings include ASCII, Latin-1, and UTF-8.
If you’re encoding is not known, then it is best off to encode the string as bytes instead.
Python always copies the string data (being provided) when making an object.
Also, for better reliability, strings should be created using both a pointer and a size rather than relying on NULL-terminated data.

Convert Hex String to Bytes in Python

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