diff options
Diffstat (limited to 'fs/nls/nls_koi8-ru.c')
-rw-r--r-- | fs/nls/nls_koi8-ru.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/fs/nls/nls_koi8-ru.c b/fs/nls/nls_koi8-ru.c new file mode 100644 index 00000000000..5db83efe27c --- /dev/null +++ b/fs/nls/nls_koi8-ru.c @@ -0,0 +1,83 @@ +/* + * linux/fs/nls_koi8-ru.c + * + * Charset koi8-ru translation based on charset koi8-u. + * The Unicode to charset table has only exact mappings. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/nls.h> +#include <linux/errno.h> + +static struct nls_table *p_nls; + +static int uni2char(const wchar_t uni, + unsigned char *out, int boundlen) +{ + if (boundlen <= 0) + return -ENAMETOOLONG; + + if ((uni & 0xffaf) == 0x040e || (uni & 0xffce) == 0x254c) { + /* koi8-ru and koi8-u differ only on two characters */ + if (uni == 0x040e) + out[0] = 0xbe; + else if (uni == 0x045e) + out[0] = 0xae; + else if (uni == 0x255d || uni == 0x256c) + return 0; + else + return p_nls->uni2char(uni, out, boundlen); + return 1; + } + else + /* fast path */ + return p_nls->uni2char(uni, out, boundlen); +} + +static int char2uni(const unsigned char *rawstring, int boundlen, + wchar_t *uni) +{ + int n; + + if ((*rawstring & 0xef) != 0xae) { + /* koi8-ru and koi8-u differ only on two characters */ + *uni = (*rawstring & 0x10) ? 0x040e : 0x045e; + return 1; + } + + n = p_nls->char2uni(rawstring, boundlen, uni); + return n; +} + +static struct nls_table table = { + .charset = "koi8-ru", + .uni2char = uni2char, + .char2uni = char2uni, + .owner = THIS_MODULE, +}; + +static int __init init_nls_koi8_ru(void) +{ + p_nls = load_nls("koi8-u"); + + if (p_nls) { + table.charset2upper = p_nls->charset2upper; + table.charset2lower = p_nls->charset2lower; + return register_nls(&table); + } + + return -EINVAL; +} + +static void __exit exit_nls_koi8_ru(void) +{ + unregister_nls(&table); + unload_nls(p_nls); +} + +module_init(init_nls_koi8_ru) +module_exit(exit_nls_koi8_ru) + +MODULE_LICENSE("Dual BSD/GPL"); |