Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  * linux/fs/nls/nls_koi8-ru.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Charset koi8-ru translation based on charset koi8-u.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * The Unicode to charset table has only exact mappings.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/nls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) static struct nls_table *p_nls;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) static int uni2char(const wchar_t uni,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 		    unsigned char *out, int boundlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	if (boundlen <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 		return -ENAMETOOLONG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	if ((uni & 0xffaf) == 0x040e || (uni & 0xffce) == 0x254c) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 		/* koi8-ru and koi8-u differ only on two characters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 		if (uni == 0x040e)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 			out[0] = 0xbe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 		else if (uni == 0x045e)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 			out[0] = 0xae;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 		else if (uni == 0x255d || uni == 0x256c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 			return p_nls->uni2char(uni, out, boundlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		/* fast path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		return p_nls->uni2char(uni, out, boundlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static int char2uni(const unsigned char *rawstring, int boundlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		    wchar_t *uni)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	int n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	if ((*rawstring & 0xef) != 0xae) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		/* koi8-ru and koi8-u differ only on two characters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		*uni = (*rawstring & 0x10) ? 0x040e : 0x045e;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	n = p_nls->char2uni(rawstring, boundlen, uni);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static struct nls_table table = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	.charset	= "koi8-ru",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	.uni2char	= uni2char,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	.char2uni	= char2uni,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) static int __init init_nls_koi8_ru(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	p_nls = load_nls("koi8-u");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	if (p_nls) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 		table.charset2upper = p_nls->charset2upper;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 		table.charset2lower = p_nls->charset2lower;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 		return register_nls(&table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static void __exit exit_nls_koi8_ru(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	unregister_nls(&table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	unload_nls(p_nls);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) module_init(init_nls_koi8_ru)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) module_exit(exit_nls_koi8_ru)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) MODULE_LICENSE("Dual BSD/GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);