ExIconv
It's an encoding auto-detection library in C
For cross-platform and C++ version, please using the estring which support Conan package manager:
https://github.com/sunxfancy/estring
It combines libiconv and libcharsetdetect to auto-detect encoding and directly transform to UTF-32.
Example:
#include "stdio.h"
#include "exiconv.h"
#define BUFFER_SIZE 4096
int main(int argc, const char * argv[]) {
FILE* f = fopen(argv[1], "r");
size_t outsize;
echar_t* str = autoreadfile(f, &outsize);
printf("echar_len = %d\n", estrlen(str));
char* utf8_str = conv2utf8(str, &outsize);
printf("utf8:%s\n", utf8_str);
fclose(f);
return 0;
}Functions:
typedef uint32_t echar_t;
struct FILE;
/**
* @brief translate UTF-32 string to utf8 for output
*
* @param data UTF-32 array
* @param outsize length of the string after transform
*
* @return It will auto malloc space for the new string, please free it after use
*/
extern char*
conv2utf8 (const echar_t* data, size_t* outsize);
/**
* @brief translate utf8 to UTF-32 array
*
* @param data utf8 string array
* @param outsize length of the string after transform
*
* @return It will auto malloc space for the new string, please free it after use
*/
extern echar_t*
utf8conv2echar (const char* data, size_t* outsize);
/**
* @brief translate UTF-32 string to a special encode
*
* @param data UTF-32 array
* @param outsize length of the string after transform
*
* @return It will auto malloc space for the new string, please free it after use
*/
extern char*
echar2code (const echar_t* data, size_t* outsize, const char* encode);
/**
* @brief translate a special encode to UTF-32 string
*
* @param data string array
* @param outsize length of the string after transform
*
* @return It will auto malloc space for the new string, please free it after use
*/
extern echar_t*
code2echar (const char* data, size_t* outsize, const char* encode);
/**
* @brief Read the file and auto-detect encoding, then translate into UTF-32 array
*
* @param f FILE pointer (binary read mode)
* @param outsize length of the string after transform
*
* @return It will auto malloc space for the new string, please free it after use
*/
extern echar_t*
autoreadfile (FILE* f, size_t* outsize);
/**
* @brief auto-detect encoding, then translate into UTF-32 array
*
* @param data string data
* @param outsize length of the string after transform
*
* @return It will auto malloc space for the new string, please free it after use
*/
extern echar_t*
autoreadchar (const char* data, size_t* outsize);
/**
* @brief detect encoding
*
* @param data string data end with '\0'
* @return name of the encoding, NULL if it's failure
*/
extern const char*
encodedetect (const char* data);
/**
* @brief detect encoding for the file
*
* @param data FILE pointer (binary read mode)
* @return name of the encoding, NULL if it's failure
*/
extern const char*
fileencodedetect (FILE* f);
/**
* @brief get the length of string
*
* @param str string data end with '\0'
* @return length
*/
extern size_t
estrlen (const echar_t* str);
/**
* Free the data
*/
#define FreeStr(p) free_str((void**)&p)
extern void
free_str(void** p);