diff options
Diffstat (limited to 'fs/hpfs/name.c')
| -rw-r--r-- | fs/hpfs/name.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/fs/hpfs/name.c b/fs/hpfs/name.c new file mode 100644 index 00000000000..1f4a964384e --- /dev/null +++ b/fs/hpfs/name.c @@ -0,0 +1,144 @@ +/* + * linux/fs/hpfs/name.c + * + * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 + * + * operations with filenames + */ + +#include "hpfs_fn.h" + +static char *text_postfix[]={ +".ASM", ".BAS", ".BAT", ".C", ".CC", ".CFG", ".CMD", ".CON", ".CPP", ".DEF", +".DOC", ".DPR", ".ERX", ".H", ".HPP", ".HTM", ".HTML", ".JAVA", ".LOG", ".PAS", +".RC", ".TEX", ".TXT", ".Y", ""}; + +static char *text_prefix[]={ +"AUTOEXEC.", "CHANGES", "COPYING", "CONFIG.", "CREDITS", "FAQ", "FILE_ID.DIZ", +"MAKEFILE", "READ.ME", "README", "TERMCAP", ""}; + +void hpfs_decide_conv(struct inode *inode, unsigned char *name, unsigned len) +{ + struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); + int i; + if (hpfs_inode->i_conv != CONV_AUTO) return; + for (i = 0; *text_postfix[i]; i++) { + int l = strlen(text_postfix[i]); + if (l <= len) + if (!hpfs_compare_names(inode->i_sb, text_postfix[i], l, name + len - l, l, 0)) + goto text; + } + for (i = 0; *text_prefix[i]; i++) { + int l = strlen(text_prefix[i]); + if (l <= len) + if (!hpfs_compare_names(inode->i_sb, text_prefix[i], l, name, l, 0)) + goto text; + } + hpfs_inode->i_conv = CONV_BINARY; + return; + text: + hpfs_inode->i_conv = CONV_TEXT; + return; +} + +static inline int not_allowed_char(unsigned char c) +{ + return c<' ' || c=='"' || c=='*' || c=='/' || c==':' || c=='<' || + c=='>' || c=='?' || c=='\\' || c=='|'; +} + +static inline int no_dos_char(unsigned char c) +{ /* Characters that are allowed in HPFS but not in DOS */ + return c=='+' || c==',' || c==';' || c=='=' || c=='[' || c==']'; +} + +static inline unsigned char upcase(unsigned char *dir, unsigned char a) +{ + if (a<128 || a==255) return a>='a' && a<='z' ? a - 0x20 : a; + if (!dir) return a; + return dir[a-128]; +} + +unsigned char hpfs_upcase(unsigned char *dir, unsigned char a) +{ + return upcase(dir, a); +} + +static inline unsigned char locase(unsigned char *dir, unsigned char a) +{ + if (a<128 || a==255) return a>='A' && a<='Z' ? a + 0x20 : a; + if (!dir) return a; + return dir[a]; +} + +int hpfs_chk_name(unsigned char *name, unsigned *len) +{ + int i; + if (*len > 254) return -ENAMETOOLONG; + hpfs_adjust_length(name, len); + if (!*len) return -EINVAL; + for (i = 0; i < *len; i++) if (not_allowed_char(name[i])) return -EINVAL; + if (*len == 1) if (name[0] == '.') return -EINVAL; + if (*len == 2) if (name[0] == '.' && name[1] == '.') return -EINVAL; + return 0; +} + +char *hpfs_translate_name(struct super_block *s, unsigned char *from, + unsigned len, int lc, int lng) +{ + char *to; + int i; + if (hpfs_sb(s)->sb_chk >= 2) if (hpfs_is_name_long(from, len) != lng) { + printk("HPFS: Long name flag mismatch - name "); + for (i=0; i<len; i++) printk("%c", from[i]); + printk(" misidentified as %s.\n", lng ? "short" : "long"); + printk("HPFS: It's nothing serious. It could happen because of bug in OS/2.\nHPFS: Set checks=normal to disable this message.\n"); + } + if (!lc) return from; + if (!(to = kmalloc(len, GFP_KERNEL))) { + printk("HPFS: can't allocate memory for name conversion buffer\n"); + return from; + } + for (i = 0; i < len; i++) to[i] = locase(hpfs_sb(s)->sb_cp_table,from[i]); + return to; +} + +int hpfs_compare_names(struct super_block *s, unsigned char *n1, unsigned l1, + unsigned char *n2, unsigned l2, int last) +{ + unsigned l = l1 < l2 ? l1 : l2; + unsigned i; + if (last) return -1; + for (i = 0; i < l; i++) { + unsigned char c1 = upcase(hpfs_sb(s)->sb_cp_table,n1[i]); + unsigned char c2 = upcase(hpfs_sb(s)->sb_cp_table,n2[i]); + if (c1 < c2) return -1; + if (c1 > c2) return 1; + } + if (l1 < l2) return -1; + if (l1 > l2) return 1; + return 0; +} + +int hpfs_is_name_long(unsigned char *name, unsigned len) +{ + int i,j; + for (i = 0; i < len && name[i] != '.'; i++) + if (no_dos_char(name[i])) return 1; + if (!i || i > 8) return 1; + if (i == len) return 0; + for (j = i + 1; j < len; j++) + if (name[j] == '.' || no_dos_char(name[i])) return 1; + return j - i > 4; +} + +/* OS/2 clears dots and spaces at the end of file name, so we have to */ + +void hpfs_adjust_length(unsigned char *name, unsigned *len) +{ + if (!*len) return; + if (*len == 1 && name[0] == '.') return; + if (*len == 2 && name[0] == '.' && name[1] == '.') return; + while (*len && (name[*len - 1] == '.' || name[*len - 1] == ' ')) + (*len)--; +} |