LXR linux/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
  11static 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
  16static const char *text_prefix[]={
  17"AUTOEXEC.", "CHANGES", "COPYING", "CONFIG.", "CREDITS", "FAQ", "FILE_ID.DIZ",
  18"MAKEFILE", "READ.ME", "README", "TERMCAP", ""};
  19
  20void 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
  44static inline int not_allowed_char(unsigned char c)
  45{
  46        return c<' ' || c=='"' || c=='*' || c=='/' || c==':' || c=='<' ||
  47              c=='>' || c=='?' || c=='\\' || c=='|';
  48}
  49
  50static 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
  55static 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
  62unsigned char hpfs_upcase(unsigned char *dir, unsigned char a)
  63{
  64        return upcase(dir, a);
  65}
  66
  67static 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
  74int 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
  86unsigned 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
 106int 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
 124int 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
 138void 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}
 146