fs/hpfs/name.c

   1 /*
   2  *  linux/fs/hpfs/name.c
   3  *
   4  *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
   5  *
   6  *  operations with filenames
   7  */
   8
   9 #include "hpfs_fn.h"
  10
  11 static const char *text_postfix[]={
  12 ".ASM", ".BAS", ".BAT", ".C", ".CC", ".CFG", ".CMD", ".CON", ".CPP", ".DEF",
  13 ".DOC", ".DPR", ".ERX", ".H", ".HPP", ".HTM", ".HTML", ".JAVA", ".LOG", ".PAS",
  14 ".RC", ".TEX", ".TXT", ".Y", ""};
  15
  16 static const char *text_prefix[]={
  17 "AUTOEXEC.", "CHANGES", "COPYING", "CONFIG.", "CREDITS", "FAQ", "FILE_ID.DIZ",
  18 "MAKEFILE", "READ.ME", "README", "TERMCAP", ""};
  19
  20 void hpfs_decide_conv(struct inode *inode, const unsigned char *name, unsigned len)
  21 {
  22         struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
  23         int i;
  24         if (hpfs_inode->i_conv != CONV_AUTO) return;
  25         for (i = 0; *text_postfix[i]; i++) {
  26                 int l = strlen(text_postfix[i]);
  27                 if (l <= len)
  28                         if (!hpfs_compare_names(inode->i_sb, text_postfix[i], l, name + len - l, l, 0))
  29                                 goto text;
  30         }
  31         for (i = 0; *text_prefix[i]; i++) {
  32                 int l = strlen(text_prefix[i]);
  33                 if (l <= len)
  34                         if (!hpfs_compare_names(inode->i_sb, text_prefix[i], l, name, l, 0))
  35                                 goto text;
  36         }
  37         hpfs_inode->i_conv = CONV_BINARY;
  38         return;
  39         text:
  40         hpfs_inode->i_conv = CONV_TEXT;
  41         return;
  42 }
  43
  44 static inline int not_allowed_char(unsigned char c)
  45 {
  46         return c<' ' || c=='"' || c=='*' || c=='/' || c==':' || c=='<' ||
  47               c=='>' || c=='?' || c=='\\' || c=='|';
  48 }
  49
  50 static inline int no_dos_char(unsigned char c)
  51 {       /* Characters that are allowed in HPFS but not in DOS */
  52         return c=='+' || c==',' || c==';' || c=='=' || c=='[' || c==']';
  53 }
  54
  55 static inline unsigned char upcase(unsigned char *dir, unsigned char a)
  56 {
  57         if (a<128 || a==255) return a>='a' && a<='z' ? a - 0x20 : a;
  58         if (!dir) return a;
  59         return dir[a-128];
  60 }
  61
  62 unsigned char hpfs_upcase(unsigned char *dir, unsigned char a)
  63 {
  64         return upcase(dir, a);
  65 }
  66
  67 static inline unsigned char locase(unsigned char *dir, unsigned char a)
  68 {
  69         if (a<128 || a==255) return a>='A' && a<='Z' ? a + 0x20 : a;
  70         if (!dir) return a;
  71         return dir[a];
  72 }
  73
  74 int hpfs_chk_name(const unsigned char *name, unsigned *len)
  75 {
  76         int i;
  77         if (*len > 254) return -ENAMETOOLONG;
  78         hpfs_adjust_length(name, len);
  79         if (!*len) return -EINVAL;
  80         for (i = 0; i < *len; i++) if (not_allowed_char(name[i])) return -EINVAL;
  81         if (*len == 1) if (name[0] == '.') return -EINVAL;
  82         if (*len == 2) if (name[0] == '.' && name[1] == '.') return -EINVAL;
  83         return 0;
  84 }
  85
  86 unsigned char *hpfs_translate_name(struct super_block *s, unsigned char *from,
  87                           unsigned len, int lc, int lng)
  88 {
  89         unsigned char *to;
  90         int i;
  91         if (hpfs_sb(s)->sb_chk >= 2) if (hpfs_is_name_long(from, len) != lng) {
  92                 printk("HPFS: Long name flag mismatch - name ");
  93                 for (i=0; i<len; i++) printk("%c", from[i]);
  94                 printk(" misidentified as %s.\n", lng ? "short" : "long");
  95                 printk("HPFS: It's nothing serious. It could happen because of bug in OS/2.\nHPFS: Set checks=normal to disable this message.\n");
  96         }
  97         if (!lc) return from;
  98         if (!(to = kmalloc(len, GFP_KERNEL))) {
  99                 printk("HPFS: can't allocate memory for name conversion buffer\n");
 100                 return from;
 101         }
 102         for (i = 0; i < len; i++) to[i] = locase(hpfs_sb(s)->sb_cp_table,from[i]);
 103         return to;
 104 }
 105
 106 int hpfs_compare_names(struct super_block *s,
 107                        const unsigned char *n1, unsigned l1,
 108                        const unsigned char *n2, unsigned l2, int last)
 109 {
 110         unsigned l = l1 < l2 ? l1 : l2;
 111         unsigned i;
 112         if (last) return -1;
 113         for (i = 0; i < l; i++) {
 114                 unsigned char c1 = upcase(hpfs_sb(s)->sb_cp_table,n1[i]);
 115                 unsigned char c2 = upcase(hpfs_sb(s)->sb_cp_table,n2[i]);
 116                 if (c1 < c2) return -1;
 117                 if (c1 > c2) return 1;
 118         }
 119         if (l1 < l2) return -1;
 120         if (l1 > l2) return 1;
 121         return 0;
 122 }
 123
 124 int hpfs_is_name_long(const unsigned char *name, unsigned len)
 125 {
 126         int i,j;
 127         for (i = 0; i < len && name[i] != '.'; i++)
 128                 if (no_dos_char(name[i])) return 1;
 129         if (!i || i > 8) return 1;
 130         if (i == len) return 0;
 131         for (j = i + 1; j < len; j++)
 132                 if (name[j] == '.' || no_dos_char(name[i])) return 1;
 133         return j - i > 4;
 134 }
 135
 136 /* OS/2 clears dots and spaces at the end of file name, so we have to */
 137
 138 void hpfs_adjust_length(const unsigned char *name, unsigned *len)
 139 {
 140         if (!*len) return;
 141         if (*len == 1 && name[0] == '.') return;
 142         if (*len == 2 && name[0] == '.' && name[1] == '.') return;
 143         while (*len && (name[*len - 1] == '.' || name[*len - 1] == ' '))
 144                 (*len)--;
 145 }