fs/hfs/trans.c

   1 /*
   2  *  linux/fs/hfs/trans.c
   3  *
   4  * Copyright (C) 1995-1997  Paul H. Hargrove
   5  * This file may be distributed under the terms of the GNU General Public License.
   6  *
   7  * This file contains routines for converting between the Macintosh
   8  * character set and various other encodings.  This includes dealing
   9  * with ':' vs. '/' as the path-element separator.
  10  */
  11
  12 #include "hfs_fs.h"
  13
  14 /*================ Global functions ================*/
  15
  16 /*
  17  * hfs_mac2triv()
  18  *
  19  * Given a 'Pascal String' (a string preceded by a length byte) in
  20  * the Macintosh character set produce the corresponding filename using
  21  * the 'trivial' name-mangling scheme, returning the length of the
  22  * mangled filename.  Note that the output string is not NULL
  23  * terminated.
  24  *
  25  * The name-mangling works as follows:
  26  * The character '/', which is illegal in Linux filenames is replaced
  27  * by ':' which never appears in HFS filenames.  All other characters
  28  * are passed unchanged from input to output.
  29  */
  30 int hfs_mac2triv(char *out, const struct hfs_name *in)
  31 {
  32         const char *p;
  33         char c;
  34         int i, len;
  35
  36         len = in->len;
  37         p = in->name;
  38         for (i = 0; i < len; i++) {
  39                 c = *p++;
  40                 *out++ = c == '/' ? ':' : c;
  41         }
  42         return i;
  43 }
  44
  45 /*
  46  * hfs_triv2mac()
  47  *
  48  * Given an ASCII string (not null-terminated) and its length,
  49  * generate the corresponding filename in the Macintosh character set
  50  * using the 'trivial' name-mangling scheme, returning the length of
  51  * the mangled filename.  Note that the output string is not NULL
  52  * terminated.
  53  *
  54  * This routine is a inverse to hfs_mac2triv().
  55  * A ':' is replaced by a '/'.
  56  */
  57 void hfs_triv2mac(struct hfs_name *out, struct qstr *in)
  58 {
  59         const char *src;
  60         char *dst, c;
  61         int i, len;
  62
  63         out->len = len = min((unsigned int)HFS_NAMELEN, in->len);
  64         src = in->name;
  65         dst = out->name;
  66         for (i = 0; i < len; i++) {
  67                 c = *src++;
  68                 *dst++ = c == ':' ? '/' : c;
  69         }
  70         for (; i < HFS_NAMELEN; i++)
  71                 *dst++ = 0;
  72 }