bsd/vfs/vfs_xattr.c

1213    attribute header, attribute entries, and attribute data.
1261  * size supported (including the attribute entries). All of
1262  * the attribute entries must reside within this limit.  If
1290 	u_int16_t   numEntries;	   /* number of entries which follow */
1291 	apple_double_entry_t   entries[2];  /* 'finfo' & 'rsrc' always exist */
1308 /* Header + entries must fit into 64K.  Data may extend beyond 64K. */
1313 	u_int32_t   total_size;   /* file offset of end of attribute header + entries + data */
1429  * - number of entries
1449 	if (rawsize < offsetof(apple_double_header_t, entries))
1465 	/* Calculate where the entries[] array ends */
1466 	header_end = offsetof(apple_double_header_t, entries) +
1469 	/* Is the file big enough to contain the AppleDouble entries? */
1477 		header->entries[i].type   = SWAP32(header->entries[i].type);
1478 		header->entries[i].offset = SWAP32(header->entries[i].offset);
1479 		header->entries[i].length = SWAP32(header->entries[i].length);
1481 		entry_end = header->entries[i].offset + header->entries[i].length;
1488 		if (header->entries[i].offset < header_end ||
1489 		    entry_end < header->entries[i].offset  ||
1505 			if (entry_end > header->entries[j].offset &&
1506 			    header->entries[j].offset + header->entries[j].length > header->entries[i].offset) {
1973 		/* Only write the entries, since the data was written separately. */
2092 		 * shifting the entries after the resource fork.
2668  * Read in and parse the AppleDouble header and entries, and the extended
2669  * attribute header and entries if any.  Populates the fields of ainfop
2670  * based on the headers and entries found.
2674  *   AppleDouble entries, the extended attribute header, and extended
2675  *   attribute entries must lie within this part of the file; the rest of
2679  *   entries).
2680  * - Find the Finder Info and Resource Fork entries, if any.
2684  * - Swap and sanity check the extended attribute header and entries (if any).
2747 	/* Find the Finder Info and Resource Fork entries, if any */
2749 		if (filehdr->entries[i].type == AD_FINDERINFO &&
2750 		    filehdr->entries[i].length >= FINDERINFOSIZE) {
2752 			ainfop->finderinfo = &filehdr->entries[i];
2770 		if (filehdr->entries[i].type == AD_RESOURCE) {
2776 			if (filehdr->entries[i].length == 0 && !setting)
2785 			if (filehdr->entries[i].length == sizeof(rsrcfork_header_t) && !setting) {
2794 				uio_setoffset(rf_uio, filehdr->entries[i].offset + 16);
2803 			ainfop->rsrcfork = &filehdr->entries[i];
2820 	 * - Swap and sanity check the extended attribute header and entries
2824 	    ainfop->finderinfo == &filehdr->entries[0] &&
2825 	    ainfop->rsrcfork == &filehdr->entries[1] &&
2838 			delta = ATTR_BUF_SIZE - (filehdr->entries[0].offset + FINDERINFOSIZE);
2839 			if (ainfop->rsrcfork && filehdr->entries[1].length) {
2842 						filehdr->entries[1].offset,
2843 						filehdr->entries[1].length,
2850 				vnode_setsize(xvp, filehdr->entries[1].offset + delta, 0, context);
2856 				rsrcforkhdr = (rsrcfork_header_t *)((char *)filehdr + filehdr->entries[1].offset + delta);
2861 				filehdr->entries[1].length = sizeof(rsrcfork_header_t);
2864 			filehdr->entries[0].length += delta;
2865 			filehdr->entries[1].offset += delta;
2870 			attrhdr->total_size  = filehdr->entries[1].offset;
2892 	 * entries (if any).  The Finder Info content must be big enough
2905 		ainfop->finderinfo == &filehdr->entries[0] &&
2949 	xah->appledouble.entries[0].type   = SWAP32 (AD_FINDERINFO);
2950 	xah->appledouble.entries[0].offset = SWAP32 (offsetof(apple_double_header_t, finfo));
2951 	xah->appledouble.entries[0].length = SWAP32 (ATTR_BUF_SIZE - offsetof(apple_double_header_t, finfo) - rsrcforksize);
2952 	xah->appledouble.entries[1].type   = SWAP32 (AD_RESOURCE);
2953 	xah->appledouble.entries[1].offset = SWAP32 (ATTR_BUF_SIZE - rsrcforksize);
2954 	xah->appledouble.entries[1].length = SWAP32 (rsrcforksize);
3040 		adh->entries[i].type   = SWAP32 (adh->entries[i].type);
3041 		adh->entries[i].offset = SWAP32 (adh->entries[i].offset);
3042 		adh->entries[i].length = SWAP32 (adh->entries[i].length);
3152 	 * variable-sized attribute entries.
3154 	 * XXX  Is there any guarantee that attribute entries are stored in