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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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74675a5850
This patch (as1239) updates the kernel's treatment of Unicode. The character-set conversion routines are well behind the current state of the Unicode specification: They don't recognize the existence of code points beyond plane 0 or of surrogate pairs in the UTF-16 encoding. The old wchar_t 16-bit type is retained because it's still used in lots of places. This shouldn't cause any new problems; if a conversion now results in an invalid 16-bit code then before it must have yielded an undefined code. Difficult-to-read names like "utf_mbstowcs" are replaced with more transparent names like "utf8s_to_utf16s" and the ordering of the parameters is rationalized (buffer lengths come immediate after the pointers they refer to, and the inputs precede the outputs). Fortunately the low-level conversion routines are used in only a few places; the interfaces to the higher-level uni2char and char2uni methods have been left unchanged. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
/*
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* linux/fs/isofs/joliet.c
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*
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* (C) 1996 Gordon Chaffee
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*
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* Joliet: Microsoft's Unicode extensions to iso9660
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*/
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#include <linux/types.h>
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#include <linux/nls.h>
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#include "isofs.h"
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/*
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* Convert Unicode 16 to UTF-8 or ASCII.
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*/
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static int
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uni16_to_x8(unsigned char *ascii, __be16 *uni, int len, struct nls_table *nls)
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{
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__be16 *ip, ch;
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unsigned char *op;
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ip = uni;
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op = ascii;
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while ((ch = get_unaligned(ip)) && len) {
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int llen;
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llen = nls->uni2char(be16_to_cpu(ch), op, NLS_MAX_CHARSET_SIZE);
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if (llen > 0)
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op += llen;
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else
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*op++ = '?';
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ip++;
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len--;
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}
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*op = 0;
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return (op - ascii);
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}
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int
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get_joliet_filename(struct iso_directory_record * de, unsigned char *outname, struct inode * inode)
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{
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unsigned char utf8;
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struct nls_table *nls;
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unsigned char len = 0;
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utf8 = ISOFS_SB(inode->i_sb)->s_utf8;
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nls = ISOFS_SB(inode->i_sb)->s_nls_iocharset;
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if (utf8) {
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len = utf16s_to_utf8s((const wchar_t *) de->name,
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de->name_len[0] >> 1, UTF16_BIG_ENDIAN,
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outname, PAGE_SIZE);
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} else {
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len = uni16_to_x8(outname, (__be16 *) de->name,
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de->name_len[0] >> 1, nls);
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}
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if ((len > 2) && (outname[len-2] == ';') && (outname[len-1] == '1'))
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len -= 2;
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/*
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* Windows doesn't like periods at the end of a name,
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* so neither do we
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*/
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while (len >= 2 && (outname[len-1] == '.'))
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len--;
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return len;
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}
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