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 } 146