Base64 Decode in C
Base64 is a widely used binary-to-text encoding scheme, employed in various applications, including data transmission and image storage. For convenience, many programming languages offer built-in Base64 encoding/decoding functionality. However, if you're working with C , you'll need to find a suitable library or implement your own code snippet.
A Modified Base64 Decoding Implementation
The following is a modified version of an existing Base64 decoding implementation in C :
Header File base64.h
#ifndef _BASE64_H_ #define _BASE64_H_ #include <vector> #include <string> typedef unsigned char BYTE; std::string base64_encode(BYTE const* buf, unsigned int bufLen); std::vector<BYTE> base64_decode(std::string const& encoded_string); #endif
Source File base64.cpp
#include "base64.h"
#include <iostream>
static const std::string base64_chars =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
static inline bool is_base64(BYTE c) {
return (isalnum(c) || (c == '+') || (c == '/'));
}
std::string base64_encode(BYTE const* buf, unsigned int bufLen) {
... // Encoding implementation
return ret;
}
std::vector<BYTE> base64_decode(std::string const& encoded_string) {
... // Decoding implementation
return ret;
}
Usage
To use the implementation, you can include the base64.h header and call the base64_decode function as follows:
std::string encodedData = "encoded_data_as_a_string"; std::vector<BYTE> decodedData = base64_decode(encodedData);
Additional Notes
- The BYTE type is an alias for unsigned char.
- The encoding and decoding functions operate on raw binary data and a string representation, respectively.
- The encoding function generates a string with a URL-safe Base64 representation.
- This snippet provides the necessary functionality for Base64 decoding in C , but please note that there are also other alternatives and libraries available that you may find more suitable for your specific needs.
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