104 lines
1.9 KiB
C
104 lines
1.9 KiB
C
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/*
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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/string.h>
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#include <linux/nls.h>
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#include <linux/mm.h>
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#include <linux/iso_fs.h>
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#include <asm/unaligned.h>
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/*
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* Convert Unicode 16 to UTF8 or ASCII.
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*/
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static int
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uni16_to_x8(unsigned char *ascii, u16 *uni, int len, struct nls_table *nls)
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{
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wchar_t *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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ch = be16_to_cpu(ch);
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if ((llen = nls->uni2char(ch, op, NLS_MAX_CHARSET_SIZE)) > 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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/* Convert big endian wide character string to utf8 */
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static int
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wcsntombs_be(__u8 *s, const __u8 *pwcs, int inlen, int maxlen)
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{
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const __u8 *ip;
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__u8 *op;
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int size;
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__u16 c;
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op = s;
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ip = pwcs;
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while ((*ip || ip[1]) && (maxlen > 0) && (inlen > 0)) {
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c = (*ip << 8) | ip[1];
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if (c > 0x7f) {
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size = utf8_wctomb(op, c, maxlen);
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if (size == -1) {
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/* Ignore character and move on */
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maxlen--;
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} else {
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op += size;
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maxlen -= size;
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}
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} else {
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*op++ = (__u8) c;
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}
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ip += 2;
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inlen--;
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}
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return (op - s);
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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 = wcsntombs_be(outname, de->name,
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de->name_len[0] >> 1, PAGE_SIZE);
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} else {
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len = uni16_to_x8(outname, (u16 *) 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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/*
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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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}
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return len;
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}
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