9e007d884e
git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@314 6ac86273-5f31-0410-b378-82cca8765d1b
148 lines
3.4 KiB
C
148 lines
3.4 KiB
C
/****************************************************************/
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/* */
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/* lfnapi.c */
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/* */
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/* Directory access functions for LFN aid API */
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/* Module is under construction! */
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/****************************************************************/
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#include "portab.h"
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#include "globals.h"
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#ifdef VERSION_STRINGS
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static BYTE *lfnaidRcsId = "$Id$";
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#endif
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#if 0
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#define E_INVLDHNDL -1
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#define E_NOFREEHNDL -2
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#define E_IOERROR -3
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#define E_INVLDDRV -4
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COUNT lfn_allocate_inode()
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{
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f_node_ptr fnp = get_f_node();
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struct cds FAR *cdsp;
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if (fnp == 0) return E_NOFREEHNDL;
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cdsp = &CDSp->cds_table[default_drive];
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if (cdsp->cdsDpb == 0)
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{
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release_f_node(fnp);
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return E_INVLDDRV;
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}
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fnp->f_dpb = cdsp->cdsDpb;
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if (media_check(fnp->f_dpb) < 0)
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{
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release_f_node(fnp);
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return E_INVLDDRV;
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}
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fnp->f_dsize = DIRENT_SIZE * fnp->f_dpb->dpb_dirents;
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return xlt_fnp(fnp);
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}
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COUNT lfn_free_inode(COUNT handle)
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{
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f_node_ptr fnp = xlt_fd(handle);
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if (fnp == 0 || fnp->f_count <= 0) return E_INVLDHNDL;
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release_f_node(fnp);
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}
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COUNT lfn_to_unicode_chunk(UNICODE FAR **nptr, UNICODE FAR **uptr,
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UCOUNT *index, COUNT count)
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{
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COUNT j;
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for (j = 0; j < count; j++, *uptr++, *index++, *nptr++)
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{
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**nptr = **uptr;
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if (**uptr == 0) return 0;
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}
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return 1;
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}
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COUNT lfn_to_unicode(UNICODE FAR *name, UBYTE FAR *lfn_entry, UCOUNT *index)
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{
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COUNT j;
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UNICODE FAR *uptr;
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UNICODE FAR *nptr = name;
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uptr = (UNICODE FAR *)&lfn_entry[1];
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if (!lfn_to_unicode_chunk(&nptr, &uptr, index, 5)) return 0;
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uptr = (UNICODE FAR *)&lfn_entry[0xe];
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if (!lfn_to_unicode_chunk(&nptr, &uptr, index, 6)) return 0;
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uptr = (UNICODE FAR *)&lfn_entry[0x1c];
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if (!lfn_to_unicode_chunk(&nptr, &uptr, index, 2)) return 0;
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return 1;
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}
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COUNT lfn_dir_read(COUNT handle, lfn_inode_ptr lip)
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{
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COUNT index = 0; /* index of the first non-filled char in the long file
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name string */
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ULONG original_diroff;
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f_node_ptr fnp = xlt_fd(handle);
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if (fnp == 0 || fnp->f_count <= 0) return E_INVLDHNDL;
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if (lfnp->l_dirstart == 0)
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{
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}
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original_diroff = fnp->f_diroff;
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lip->name[0] = 0;
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while (TRUE)
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{
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if (dir_read(fnp) <= 0) return E_IOERROR;
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if (fnp->f_dir.dir_name[0] != DELETED && fnp->f_dir.dir_name[0] != '\0'
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&& fnp->f_dir.dir_attrib != D_LFN)
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{
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fmemcpy(lip->l_dir, fnp->f_dir, sizeof(struct dirent));
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lip->l_diroff = fnp->f_diroff;
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lip->l_dirstart = fnp->f_dirstart;
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break;
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}
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}
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fnp->f_diroff = original_diroff - DIRENT_SIZE;
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while (TRUE)
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{
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if (fnp->f_diroff == 0) break;
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fnp->f_diroff -= 2*DIRENT_SIZE;
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if (dir_read(fnp) <= 0) return E_IOERROR;
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if (fnp->f_dir.dir_name[0] == '\0'
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|| fnp->f_dir.dir_name[0] == DELETED) break;
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if (!lfn_to_unicode(lip->name,
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(UBYTE FAR *)fnp->f_dir, index)) break;
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}
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if (lip->name[0] == 0)
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{
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ConvertName83ToNameSZ(lip->name, lip->l_dir.dir_name);
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}
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return SUCCESS;
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}
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/* Calculate checksum for the 8.3 name */
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UBYTE lfn_checksum(char *name)
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{
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UBYTE sum;
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COUNT i;
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for (sum = 0, i = 11; --i >= 0; sum += *name++)
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sum = (sum << 7) | (sum >> 1);
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return sum;
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}
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#endif
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