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/*

 *  linux/fs/hpfs/name.c

 *

 *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999

 *

 *  operations with filenames

 */

#include <linux/string.h>

#include "hpfs_fn.h"

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", ""};

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)

{

        int i;

        if (inode->i_hpfs_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;

        }

        inode->i_hpfs_conv = CONV_BINARY;

        return;

        text:

        inode->i_hpfs_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 (s->s_hpfs_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(s->s_hpfs_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(s->s_hpfs_cp_table,n1[i]);

                unsigned char c2 = upcase(s->s_hpfs_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)--;

}